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dBBati 4.1 User Manual

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1. OdB 2 50 10 dB 0 794 C 20 dB 0 25 C 30 dB 0 08 For more information on SYMPHONIE or HARMONIE for example connection plugs and driver configuration consult the system installation manual PAGE 134 CHAPTER 20 SIMPLIFIED USER LEVEL DBBATI32 SOFTWARE SUITE USER MANUAL Noise generator parameters A pink noise generator may be used for measurement of emitted and received noise spectra as well as RT spectra It is necessary to connect an amplified loudspeaker to the LEMO4 output socket of the SYMPHONIE or HARMONIE acquisition box to generate a pink noise This generator may manually activated with an icon of the measurement window or the F11 function key It may also be automatically started and stopped by dBBATI32 To do so tick the option automatic and define a stabilisation duration before staring the acquisition and the emission duration as a function of the percentage of the complete duration of the measurement Frequencies Frequencies C Octaves Min fion i Third octaves a peer ea ron cnr Mas P k F Choose between octave and third octave spectrum analysis and define the frequency limits for the analysis RT computation AT computation Start dB Dynamic dB 5 fao M Strict dBBATI32 offers reverberation time calculations from either stationary impulsive or MLS signals The computation algorithm therefore depends upon the type of
2. 63Hz TR 4 53 s 125Hz TR 2 94 s This window is made up of A frame showing the current RT spectrum resulting from regression calculation of the time decay of each frequency band and the time decays of each frequency band The slope of these decays on which the RT value depends can be adjusted manually It is possible to zoom each time decay frame by Double click double clicking within its frame or by pressing the E gt Enter key e cme4 D croissances ID 3 Escalier Fe balale okl 4 Dell Regression line computed The slope represents the RT value in seconds 500Hz TR 2 42 s Noise level of the source before cut off Active decay used for regression computation ee ee ee Pe EAE Oe fe wade a a a ee ee ee ee A oR S O gk Oe ogee Re Oe ae ee E Background noise level These elements are automatically selected according to the user defined RT calculation parameters and the calculation algorithm The toolbar of this window allows the user to perform the following operations AUTO iF Modify the measurement identifier and add comments jp Automatic re scaling of the plots Define or modify the leudon parameters Ha Link cursors on all the graphical view not active for RT adjustment Define a study zone for a given frequency band dBBATI32 allows the user to exclude any part of the time i history such as noise parasites double decay etc that are not useful for the calculation
3. CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 95 DBBATI32 SOFTWARE SUITE USER MANUAL 15 7 Edition and execution of requests data sorting Measurement session datafiles have a structure similar to databases As any measurement result is stored into these datafiles a set of requests functions allow the user to sort the data according to various parameters One can display for example data items of the same family only audio events narrow band spectra octaves and third octave spectra etc in the measurement session view The simplest way to sort data Is to click on a column field in the measurement session 15 7 1 Overview of requests edition Use the command Datafile Edition of requests to open the dialog box that allows the user to define edit or remove requests Aj tems Management of requests x Insulation List of requests general Add local request Impact noize Mechanical equipement nose Add global request Absorption Edt Delete Cancel dBBATI32 manages two types of requests local requests which apply only to the active measurement session and global requests which apply to any measurement session Global requests are preceded by an asterisk The procedure to define a request is the same in both cases Click on the key Add local request to add a new local request to the active measurement session and click on the key Add glo
4. Background noise n Reverberation time In this chapter we select each type of spectrum measurements that can be done Room criteria E Emi Rec simultaneously The manager toolbar then looks like this Measure Demo gam A lu di 3J Configure Parametize Standard sp Emission Airborne noi Impact noise Background ErniRec si Refer to chapter 6 for more information on how to use the managers in dBBATI32 All the display and acquisition parameters can be saved in a measurement manager file GSM by using the command Acquisition Save As CHAPTER 7 SPECTRA MEASUREMENTS PAGE 31 DBBATI32 SOFTWARE SUITE USER MANUAL 7 1 Measurement window overview All measurement window can be accessed from the icons of the manager toolbar An example of spectra measurement window is given below Command toolbar Mi Measure Standard spectrum Demo gsm 2 3 CA a we fea le Channel 1 acquisition parameters Average averaging parameters gains threshold start stop measuring etc Channel 2 OW I Average 125 250 500 1k 2k Locati nl Kitchen iRoom gt Com Dema Measure 0 See 20 4k At 0 i 3 3 4 Display parameters toolbar curves to display autoscale time history etc Display acquired data with cursors values and references Status bar state and information about the acquisition process The measurement
5. Analysis of audio records dBBATI32 allows one to perform three types of analysis on audio records spectra analysis RT analysis and room criteria analysis Analis Demo gsa GO s m lt M amp Configure Farametrize Spectrum Reverberatio Room criteria These analyses can be configured and performed with the help of the analysis manager Analysis menu Analyses can performed successively in an automatic manner for several audio signals using the batch mode Refer to chapter 16 17 and 18 for detailed explanations on audio data analysis Standardised calculations In this version of dBBATI32 several standard indices may be computed directly using the computation manager 4 different types of computation are available Standard calculations menu Insulation Impact noise Mechanical equipment noise and absorption Computation Dema gsc amp Contigure Parametize Insulation Impact noite Mechanical Absorption Standardised calculations may be performed successively in an automatic manner over several items using the batch mode Refer to chapter 16 for detailed explanations on standardised calculations The tables shown below features all the indices computed in dBBATI32 as well as the standard it refers to Airborne noise insulation Standardised level difference DnT French standard NF S 31 057 A weighted standardised level difference DnAT Raw insulation
6. L ACQUISITION See paragraph 11 2 5 Delay to leave the room al blank gun shot ee 1 Impulse si Peters ee START _ ese ornare ae er E E E E E E E E E E E E E a E E E E E i Wait delay Measurement i by See paragraph 11 2 5 See paragraph 11 2 5 See paragraph Emission of MLS sequence eee eee eee eo oe l E re ACQUISITION COMPUTATIO N Delay to leave the room s s s s a s a CEOE OE t e oo on ne ne ne ee ee ee ee START a Wait delay Autorange lt Measurement lt Computation BARRE DE STATUT o 08 O The states Wait dela y and Autorange are optional CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 70 DBBATI32 SOFTWARE SUITE USER MANUAL 12 DECAY EDITION WINDOW ROOM CRITERIA The time decay edition window is used to display the decays that are used to compute room criteria This window is displayed at the end of the room criteria measurement or analysis process see chapters 11 and 18 It is also possible to modify decays linked to an existing RT spectrum of the measurement session When editing a decay item it is not possible to close the measurement session BF Mesure Crit res de salle Demo gsm D croissances Yoie 1 This window present The spectra or values of the room criteria The time decays for each active frequency band It is possi
7. Physical unit If the transducer is a microphone he dynamic is displayed in Pascals Pa If the transducer is an accelerometer the dynamic is displayed in Acceleration m s2 For sound and vibration quantities of type autospectrum cross spectrum and transfer functions it is possible to select the following display units dB Level in decibels of the considered quantity Leg Slow Fast Impulse etc RMS Root Mean Square Average quadrate value for all the instantaneous squared values expressed in physical units PWR Power The power represents the average of a squared value It is the unit used to determine the power at a given frequency for a determined sinusoidal signal It is expressed in squared units It is possible to display up to two signals on the same graphical view if the data items have the same characteristics periods duration CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 89 DBBATI32 SOFTWARE SUITE USER MANUAL 15 3 2 Broad band spectra view This type of view is used to graphically display spectra in broad bands octaves third octaves An example of this type of view is given below Definition of data display parameters and general graphical view parameters a Graphe spectre cmg1 cmg ID 5 Moyenne G1 dB Ref 2 00e 05 Pa PWR Hz ii ID 6 Moyenne G1 dB Ref2 00e 05 Pa PWR Hz MEMME Display of spectra onthe SE er eer atu Dp
8. 1 DESCRIPTION OF A 01DB STELL PC BASED MEASUREMENT CHAIN You have purchased a 01dB PC based system to perform sound and vibration analysis The 01dB concept is to combine sound and vibration instrumentation with the computational and management facilities of a PC For first time users of a PC based measurement chain the following chapter describes the concept with respect to environmental noise measurements For more general information on the concept of a PC based measurement system see the getting started user manual delivered with your measurement system 1 1 Introduction The use of personal computers for acoustical measurement and data processing has been a topic of much discussion even controversy over recent years The phenomenal growth in PC technology now offers the benefits of computational speed and flexibility that are being employed in many areas of research and engineering applications Traditionally the function of acoustical measurement has belonged to the dedicated instrument while the computer has carried out the tasks of data storage display and basic processing The interface between the two has been either an RS 232 serial communication or manual entry via a keyboard Human error excessive time and long rolls of silver paper are just some of the disadvantages of this system An attractive solution for the pure technologist is to build a PC based instrument though the benefits over the dedicated instrument sh
9. Optionally 1 background noise Optionally 1 background noise spectrum spectrum m Frequencies Third octaves Third octaves Octaves or third octaves The Ln spectrum must contain the frequency bands ranging from100 to 3150 Hz in third octaves Computation Per frequency band Computation is carried out taking into account Per frequency band the frequency bands ranging from 100 to 3150 dB Hz in third octaves La Li 10 Ig 0 16 V T Ay The reference curve cf table 4 is shifted in dB Li Received impact noise raw impact steps of 1 dB towards the measured curve Ln noise level spectrum until the sum of the unfavourable Li Received impact noise raw V Volume of reception room m deviations is as large as possible but no more impact noise level T RT reception room than 32 0 dB 2 0 dB per frequency band 16 V Volume of reception room m Ao Reference equivalent absorption bands T RT reception room area 10 m2 An unfavourable deviation at a particular Ao Reference equivalent frequency occurs when the result of absorption area 10 m2 If background noise spectrum as an measurements is greater than the reference input there is an additional value If background noise spectrum as an correction cf 2 Only the unfavourable deviations are taken into input there is an additional account correction cf 3 After the progressive curve shifting dB is the value of the reference curve at 500 Hz R
10. Reverberation time Selected temz 1 1 Frequencies Octaves C Third ochayves m E ll actaves Min 125 Max 4k Time step of decays ms Click on the Parametrize key of the measurement manager and select the RT computation tab dBBATI32 offers reverberation time calculations from either stationary impulsive or MLS signals The computation algorithm therefore depends upon the type of the audio records to analyse Refer to paragraph 15 2 6 5 From an impulsive signal source using MLS or not it is possible to apply integration Schrd eder and or suppress the background noise During the calculation phase the start and end settings define the regression boundaries that are used to calculate the RT values by frequency bands See chapter 21 2 for a detailed reverberation time calculation explanation 17 2 3 Processing and averaging parameters Use the options tab of the analysis set up dialog box Store the time decays associated with each RT spectrum for later analysis Analysis set up Demo gsa Analysis RT computation Options Reverberation time Automatic validation of the results When a spectrum is calculated it will be automatically stored in the active data session This option is useful for a batch analysis of several audio data items see paragraph 17 4 Selected items Tid I Storage of decays Automatic validation Averaging over all the sele
11. gt y Background Decay Background noise noise Arrival of direct wave Each integral used to compute the criteria correspond to the difference between two cumulated energies For example the Clarity 80 will give S8Oms dt cumuk80ms cumulondedirect 0 There is a relationship between the sound energy contained in a given time interval and the sound energy in the following time interval Several time intervals have been proposed 33 35 50 80 and 95 ms For each interval the main idea is the same the energy contained in this interval is considered as useful and the energy of the next time interval is considered as secondary or even harmful in particular cases This comes from the functioning of the ear The ear cannot differentiate sound reflections that occur in less than 35 50 or 80 ms The individual contributions of the first reflections are therefore added These energy relationships describe the subjective indicators such as Clarity LJ clarity so This criterion defined by Reichardt is the ratio between the sound energy contained in the first 80 milliseconds of the impulse response after the arrival of the direct wave where the time T is set to zero and the energy contained in the rest of the impulse response It draws a relationship between the subjective sensation of a sound field and the interpretation of reflected sounds by the ear 80ms rod ef E 80 C80 10 log 10 log Trop in dB rod 80ms
12. oon Pe ee LL eae oon ni mu eee pa CETELE LLETETELEELLEL ce Cee ee ee ee f eee eee ee ee T TIME Pre sequence noise At this stage the aim is to define the SSP and SCOP common to all decay curves From the forecast first point of the sequence see figure above a recursive algorithm is applied to define the SSP On the other hand the determination of the SCOP point is performed At the end of the process the SSP and SCOP co ordinates as well as the PRSN level are known CHAPTER 21 APPENDICES PAGE 139 DBBATI32 SOFTWARE SUITE USER MANUAL Determination of the sequence ending point SEP and post sequence noise POSN on each of the considered frequency bands Terminology SEP The sequence ending point is the point where the decay ends and the post sequence noise starts The SEP is frequency band dependent BAND DEPENDANT Considered Sequence LEVEL SCOP Forecast 3 first point 5 of the hed ea a a Seguente A N E E L E Pre sequence noise Post sequence noise PRSN POSN POSN The post sequence noise is the noise level once the decay itself has ended The POSN is frequency band dependent For each of the considered frequency bands this stage is dedicated to defining the SEP and the POSN To do so the same type of algorithm as during the SSP and PRSN determination is applied Once completed on each band the limits on the decay curves to be taken into account for the r
13. or use the command File New CTRL N An empty measurement session is then displayed on screen CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 81 DBBATI32 SOFTWARE SUITE USER MANUAL 15 1 2 Open a CMG datafile To open a CMG measurement session file stored on the computer hard disk click on the icon or use the command File Open The following dialog box appears on screen Open J data E TRIBE RABCIER a test 991116 094450 CMG a4 demo_981118_103444 CMG se test_981116_094749 CMG Look in Select a measurement session file in the list files with extension Choice of the hard disk sub directory where CMG a fast_981113_160439 CMG e test _981116_094854 CMG the CMG files are A test 981116 _094019 CMG a test 9811716 095036 CMG stored faa test_981116_094055 CMG l a test_961116_094145 CMG Name of the selected measurement mone Fil demo 981117 181137 CMG __ Gren session file a alle Files of type o dE Measurement File CMG Cancel Int ti T Sate Gl ok Detailed information on General Size bytes 518199 the selected CMG files informations on Stat 17 98 18 11 37 7 number of audio the selected CMG End 17 11 98 18 33 28 records noise i Autozpectr uantities codes etc ue Created 19 11 98 135533 kg a eee Saved 19 11 98 13 55 32 Version 1 001 Leq tems g A ange Cc J The upper part of this dialog box allo
14. Copy of an item when a study zone has been defined For items where a study zone can be defined an audio signal for example it is possible to copy the image of the view over the complete duration of ey the item option Copy the whole or to copy only the image of the view Be over the defined study zone Copy only the study zone The default option Be prompted for the type of copy each time allows the user to display a message to either copy the image of the view over the complete duration or the study zone The following message appears on screen dBFas2 AN Certains l ments s lectionn s ont une zone d tude d finie De siez vous copier uniquement cette zone See paragraph 15 2 6 for more details on defining a study zone Copy data items at ASCII format When copying directly data items from the measurement session window at ASCII format an additional parameter is the way it will be pasted in a word or spreadsheet processor The data values can be displayed vertically default value data of X axis and Y axis are displayed in columns Alternatively they can be displayed horizontally data of X axis and Y axis are displayed in lines CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 104 DBBATI32 SOFTWARE SUITE USER MANUAL 15 8 4 Exportation of data at ASCII format TXT file The command File Export allows the user to copy the data values of one or several items of a measurement se
15. Hal f 3 Re D French standard 1 3 24 02 00 11 41 52 Hal 5 F q g ae Background noise B 24 02 00 11 43 27 Esc Configure Parametrize Emission Airbome nois Background Reverberatio D French standard 1 9 24 02 00 11 43 27 Hal D French standard 1 3 24 02 00 11 43 27 Hall Escalier MLE 40am 1 3 24 02 00 11 55 42 Escalier Computation Demo gsc 1 3 24 02 00 11 55 42 Escalier g n 1 3 2402 00 11 59 51 Escalier fe E dp 12 ae Configure Parametrize Insulation Impact noise Group by 1 v Listage CMG Listage WACWRListage CMG ID 1 2 Famille Autospectre Autospectre _ Graphe spectre Listage CMG Type Emission R ception R solution X 1 1 1 1 ID 41 LnT Demo Demo E Es A L E EN a ce E OK Date ID 42 Lin Demo Demo BE SE EA ition ew i D finition WHz E 01 02 00 14 03 29 Demo 01 02 00 14 03 39 Demo Lieu Commentaires Demo Demo Voie 1 1 SRERSRAAS KS is 20 sio tk 2k ak sk tis ao sdo tk zk sk sk tis ao sdo ik zk k SEERE TA E ges ere ee ee T Gade M E EETA LEAUT AEE AE EE E i Foe Global A cee ee ee ee ee ee ee ee ee ee ae Global Lin 13 ie sio tk zk sk sk e oun eypap oN peoustits O1dB ie METRAVIB technologies USER MANUAL Py 01d METRAVIB technologies Copyright dBBATI32 Building acoustics measurement and processing softwar
16. Ma 5 k ve spectrum analysis and define the PAGE 63 DBBATI32 SOFTWARE SUITE USER MANUAL 11 2 3 Signal characteristics Select of signal that will be used for the room criteria measurement E Impulse signal Signal Impulse zi Measurement duration MLS p 4 Q MLS Signal dBBATI32 offers room criteria computation from the measurement of an impulse response The duration of the measurement is defined in seconds Refer to paragraph 21 5 for the calculation principle of room criteria Refer to paragraph 11 4 for detailed explanations on the measurement process In MLS mode Maximum Length Sequence follow the recommendations below It is necessary to connect an amplified loudspeaker to the LEMO4 output socket of the SYMPHONIE or HARMONIE acquisition box Signal Impulse Response duration MLS jess H Number of averages 16 T Measurement duration 41 02 Order 16 The response duration should be carefully selected as it should be adapted to the geometry of the room Make sure that the response duration is long enough in order to obtain a background noise at the end of the measurement It is possible to average this response in order to decrease the effect of background noise The higher the average number the better the response quality because the influence of random phenomena background noise decreases On the other hand the acquisition duration increases the s
17. Remove background noise I Reverberation time Start dB Dynamic dE 5 2o T Strict Selected items Tid intelligibility criteria r STI a EDT W RASTI T Schroeder integration Signal Noize ratios Hz 125 250 500 1k 2k 4k Bk gp hoo foo foo foo foo fioo foo Infinite W Clarity jeo m M Definition 50 ms W STI Refer to paragraph 21 5 for the calculation principle and definition of room criteria The computation of intelligibility criteria account for the signal to noise ratios per frequency bands It is however to manually inputs these values By default background noise is considered neglectable thus having a signal to noise ratio infinite 100 11 2 5 Measurement options The configuration of measurement options can be performed in the Options tab of the measurement set up dialog box r a 8 1S Define if decays are to be recorded into the measurement session Acquisition Criteria computation Options for later analysis Define if the audio signal is to be recorded to hard disc When this option is activated the audio recording is stored in the active measurement session datafile at the end of the acquisition Selected items 1 M Decay storage Perform an autorange automatically before each measurement Signal storage IY Autorange before each acquisition F Automatic validation Automatic validation of the results Delay s 5 l z a m Def
18. When a measurement is performed with say two active channels dBBATI32 calculates the average RT spectra over the two M between channels of the same type Jo Storage ol specta fom each cherie channels Each spectrum of an active channel may be stored separately IY Over several measurements Vereen at mo j Averaging over several measurements Soe pee aera I dBBATI32 will calculate a unique averaged spectrum over a Storage of intermediate spectra sequence of spectra Use the dialogue box to define the number of Ba eer casual measurements to be included in the averaging calculation qd by generator or MLS Intermediate spectra calculated for each measurement will be stored in order to effect the averaged spectrum The option Automatic validation allows the user to perform a serie of measurements automatically It is possible to combine the two types of averaging methods CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 52 DBBATI32 SOFTWARE SUITE USER MANUAL 9 2 6 Gain and threshold command autorange Once the measurement set up has been completed from the measurement manager perform the following from within the measurement window Use the command aA M Commands Gains and threshold This dialog box enables the definition of gain and threshold settings These parameters can be used in several ways by the application software All parameters and the available actions may be enabled or disabled according to the
19. measurements Remove background noise From an impulsive signal source using MLS or not it is possible to apply integration Schr eder and or suppress the background noise During the calculation phase the start and end settings define the regression boundaries that are used to calculate the RT values by frequency bands See chapter 21 2 for a detailed reverberation time calculation explanation Options Options Define if time decays are to be recorded into the measurement session for later I Store time decays analysis I Store HVAC noise spectrum Tick the box Equipment noise spectrum storage to save the mean Slow M Automatic autorange before acquisitior i 5 i spectrum along with the measurement results autospectrum data item T Automatic validation M Delayed acquisition Perform an autorange automatically before each measurement 5 E Delay Taj Automatic validation of the results Define a delay before starting a measurement so that the operator may leave the room during the measurement process CHAPTER 20 SIMPLIFIED USER LEVEL PAGE 135 DBBATI32 SOFTWARE SUITE USER MANUAL 21 APPENDICES 21 1 Edition of the software licence number l About dEBati32 El Use this command menu About dBBATI32 to obtain general information on the software version Version 4 011 copyright and licence number o Copyright C 1998 99 Li ber SOO OO If the licence number of the software module has
20. with h t the impulse response of a room This parameter is negative when the energy after 80ms is greater than the energy in the range 0 80ms It is positive when the energy after 80ms is less than the energy in the range 0 80ms E80 gt Erev Subjective evaluation This criterion is mainly employed for music It translates subjective sensations dealing with The definition The discrimination The sharpness of attacks The differentiation between different voices The transparency The source location etc CHAPTER 21 APPENDICES PAGE 152 DBBATI32 SOFTWARE SUITE USER MANUAL Values The measurement of the clarity coefficient C80 is performed with an Omni directional microphone Examples of values for known auditory 1 ss Auditorium Smallest value Averaged value Greatest value Gross Musikhereinsalle Vienna Salle Pleyel Paris Auditorium M Ravel Lyon 1 JULLIEN J P Acoustique des Salles CNET LANNION 1982 p 19 In general values around 0 dB mean that the acoustics of a room is well suited for listening to symphonic music For music the limits that are usually used range form 2 to 2 dB For operas C80 must lie in the range 1 to 4 dB E Clarity 50 This criterion as for C80 is calculated as the ratio between the sound energy contained in the first 50 milliseconds of the impulse response after the arrival of the direct wave where the time T is set to zero and the energy containe
21. 0 08 mouse A contextual menu appears Choose the Configuration field and set the SYMPHONIE output level The output level is changed in real time if you are playing a noise For more information on SYMPHONIE or HARMONIE for example connection plugs and driver configuration consult the system installation manual 9 2 4 RT computation parameters E S Click on the Parametrize key of the measurement manager and select the RT computation tab Acquisition AT computation Options dBBATI32 offers reverberation time calculations from either stationary impulsive or MLS signals Reverberation time Selected items 1 1 From an impulsive signal source or MLS signal it is possible to apply integration Schr eder and or suppress the background noise Computation Start dE Dynamic dE 5 E 30 Strict IF impulse signal or MLS During the calculation phase the start and end settings define the regression boundaries that are used to calculate the RT values by frequency bands W Schroeder integration See chapter 21 2 for a detailed reverberation time calculation explanation CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 51 DBBATI32 SOFTWARE SUITE USER MANUAL 9 2 5 Measurement options The configuration of measurement options and if required averaging options can be performed in the Options tab of the measurement set up dialog box Measurement set up Demo gsm X Acquis
22. 03 Hall MLS 2 6s 6M 10 dB 10 Autospectrum Received noise 13 2402 00 11 38 03 Escalier MLS 26s 8M 10 dB 12 Autospectrum Background noise 13 24 02 00 11 41 52 Escalier standard 14 Sound insulation D French standard 153 24 02 00 11 41 52 Hall Escalier g n pilot avec BF 15 Sound insulation D French standard 1 3 24 02 00 11 41 52 Hall Escalier t l commande avec BF 13 Autospectrum Background noise 13 240200 11 43 27 Escalier MLS 2 6s 6M 16 Sound insulation D French standard 1 5 24 02 00 11 43 27 Hall Escalier MLS 25 Sound insulation OD French standard 1 3 24 02 00 11 43 27 Hall Escalier MLS 10dB 29 Decay 13 24 02 00 11 55 42 Escalier 30 RT 13 24 02 00 11 55 42 Escalier g n pilot Decay 13 24 0200 11 59 51 Escalier ae TAMIA 44 70 04 aa Select data items in the list and perform the desired operation b A l For help press F1 key NUM Vi Display of data items contained in the datafile as for a database 15 2 1 Toolbars The following operations are possible for the data items contained in a measurement session file According to the type and number of items selected in the list some operations may not be activated L Create an empty measurement session file CTRL N List table the selected data items Open an existing measurement session file CTRL O et Playback the selected audio events Save the active measurement session file CTRL S Modify a data item date l
23. 05 Pa Hz ME ii EE Moyen lin E 1 1 a a Lin dB Ref 2 00e 05 Pa Hz I EE isd Moyenne R2 1 3 Received noise 100 96 9 80 4 34 5 125 915 720 36 7 160 88 9 67 2 a l A a aS ee st Nee Re Se ee hE ge 200 88 1 595 275 845 56 0 276 315 845 523 257 400 86 4 513 235 gaat Seeeahn8is Balti 500 90 6 498 245 nue oy ie ae BRA E gogg gg 800 91 1 475 257 i 88 5 46 2 25 0 atl Beoegekeetakle a 1 25k 86 1 40 6 249 Roa RE ESE RE RR Ree 1 6k 855 376 26 1 86 8 37 0 273 2 5k 85 5 40 1 301 4k 3 15k 86 7 429 295 819 3 5 295 29 6 5k 76 5 Copy Image Microsoft Word Document2 Preview Ioj Xx Eile Edit view Insert Format Tools Table Window Help amp ao is 50 F Pa Close R por Oui X Microsoft Excel Booki I File Edit view Insert Format Tools Data Window Help x Deulais magoo ea Arial alio Brlu O A C O1DBPR 1 DATA REF DEMOBATI FC Lieu Emmitted Received loise Date 25 11 94 25 11 94 Heure 15 49 56 15 49 56 Type L L R solution O1 mars 01 mars Attribut Moyen lin Moyen lin Genre E R Vole 1 2 Piste 1 2 Hz dB dB 100 96 9 oO 4 125 91 5 72 160 50 9 67 2 200 56 1 595 250 545 56 315 84 5 523 400 86 4 513 500 90 6 49 8 630 914 49 3 800 91 1 475 1k 88 5 46 2 406 sheet2 sheet3 gt aT D A e aM N OT lUy Page 1 Sec 1 1 1 at 2 4cm
24. 7 SPECTRA MEASUREMENTS E Enable or disable linked amplitude scales of plots for each active measurement channel AUTO Perform an automatic autoscale to adjust data Fill display at the end of the measurement PAGE 32 DBBATI32 SOFTWARE SUITE USER MANUAL 7 2 Measurement set up ra N Measurement set up can be done by pressing the key Parametrize of the manager The dialog box shown below appears on screen Heasurement set up Demo gsm Acquisition Options Standard spectrum Emission Airborne noite reception level Impact nose reception level Signal Background noize cy Selected items 1 6 standard Measurement duration MLS 3 j Ea M Pink noise generator Emission T Emission f C Octaves Mini fioo Third octaves I Full octaves Stabilisation duration before acquisition 40 completed Maw 5 k The above settings are for measurement of an emitted noise spectrum The set up process will however be the same for other types of spectra measurements Refer to chapter 6 for more information on how to use the managers Received impact noise MLS and Pink noise generator options are not available Background noise Pink noise generator option not available 7 2 1 Acquisition channel types for spectrum measurement Channels a Emission E Define the active measurement channels the acquisition platform input M2 Airborne nose reception leve lines that will be used fo
25. 717 1 Shada comments of the selected data item As default the fields Client and Test The layout and the an Company are empty It is possible to number of graphics complete manually these fields and there and tables in the ENE octaves dB will be used again for all subsequent report depend upon the data item selected in the datafile reports by using the command Preferences Fields of test reports see below The parameters that have been used for NI the computation of the data item selected in the computation manager 125 250 500 1000 2000 4000 cannot be modified Evaluation according to ISO 717 1 of Dn T w C Ctr dB 16 1 3 H oweve r n SO m e re po rts oth er Based upon field measurements obtained with an expert method parameters may be completed manually Report no 25418 Test company 01dB MVI Technologies group 19 05 00 Signature CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 93 DBBATI32 SOFTWARE SUITE USER MANUAL Test reports x Client Definition of default fields for the test reports John Goodman 3 Road 66 Use the command Preferences Fields of test reports to define as standard 25415 SAN FRANCISCO the references of the client and the company that performed the test featured on each test report Test company Enter text here This operation allows the user to save time when editing a test report but it is al
26. 717 1 ISO 140 4 ISO 717 1 1 standardised sound insulation spectrum Dn T Frequencies Computation 1 emitted noise spectrum 1 received noise spectrum Optionally 1 background noise spectrum aa a Octaves or third octaves Per frequency band D L1 L2 dB L1 Emitted noise level L2 Received noise level If background noise spectrum as an input there is an additional correction cf 3 Result per octave or third octave bands over the whole frequency of the input spectra quantities D CHAPTER 21 APPENDICES 1 emitted noise spectrum 1 received noise spectrum 1 RT spectrum Optionally 1 background noise spectrum V Volume of reception room m Octaves or third octaves Per frequency band D D 10 ig 0 16 V T Ao dB V Volume of reception room m T RT reception room Ao Reference equivalent absorption area 10 m2 If background noise spectrum as an input there is an additional correction cf 3 Result per octave or third octave bands over the whole frequency of the input spectra quantities 1 Normalised sound insulation spectrum Dn Octaves or third octaves The Dn spectrum must contain the frequency bands ranging from100 to 3150 Hz in third octaves and 125 2000 Hz in octaves Computation is carried out taking into account the frequency bands ranging from 100 to 3150 Hz in third o
27. Cancel threshold condition is fulfilled a recording will be executed At the end of each recording dBBATI32 stores the new item in a measurement session datafile CHAPTER 13 SIGNAL ACQUISITION PAGE 76 DBBATI32 SOFTWARE SUITE USER MANUAL 14 MLS ACQUISITION MODE 14 1 Set up and measurement The acquisition in MLS mode Maximum Length Sequence is used for measurements of the impulse response of a given system It is based on the emission of a Binary Maximum Length Sequence BMLS Refer to annex 21 2 for more information The command Acquisition MLS acquisition mode to perform room impulse response measurements Before proceeding with the MLS acquisition two items have to be connected to the hardware platform an amplified loudspeaker noise source connected to the output of the hardware platform in order to generate the BMLS connect one or several microphone s to input channel s to measure the system response HLS acquisition Location IB arrier eli Start acquisition Gain settings Stop acquisition Set up the acquisition parameters Autorange Exit MLS acquisition mode L Stage 1 Set up acquisition parameters Use the icon to define the acquisition parameters in MLS mode The dialogue box opposite appears on the screen Order E This dialogue box allows the operator to define the order which interact with the Number of b E response duration the number
28. DATAFILE MANAGEMENT 15 1 1 New CMG datafile 12 Open a CMG datafile 15 1 3 Close a CMG datafile 15 1 4 Save a CMG datafile 15 1 5 Delete one or several CMG datafile s 15 2 MEASUREMENT SESSION WINDOW OVERVIEW 15 2 1 Toolbars 15 2 2 Measurement session information window PID Measurement session comments 15 2 4 Playback audio events TIZA Delete data items 15 2 6 Modify data items edition 15 2 6 1 Edition of items date and time 13 2262 Edition of items location and comments 15 2 6 3 Edition of items Level conversion TABLE OF CONTENTS PAGE 6 47 48 49 49 49 50 51 52 52 52 53 55 33 ap 56 56 56 59 61 62 63 63 63 64 65 65 66 68 68 68 69 69 70 71 73 73 75 76 77 77 78 81 81 amp 1 8 amp 2 8 amp 2 82 8 amp 2 83 83 84 84 84 84 85 85 85 85 DBBATI32 SOFTWARE SUITE USER MANUAL 15 2 6 4 Edition of items study zone 15 2 6 5 Edition of items Type for building acoustics 15 2 6 6 Edition of items Information 1932 7 Create new data item 15 2 8 Operations on data items 15 3 PLOT DATA ITEMS GRAPHICS 15 3 1 Signal view 15 3 2 Broad band spectra view 13 321 Display parameters of the graphical view 15 3 2 2 Data parameters for the graphical view 15 4 LISTINGS OF DATA ITEMS TABLES 15 5 AUTOMATIC TEST REPORTS 15 6 DESCRIPTION AND SELECTION OF COLUMNS IN A MEASUREMENT SESSION WINDOW 15 7 EDITION AND EXECUTION OF REQUEST
29. In standard mode all the functions of the software are available It is possible to access to the simplified version of the software by using a command User level of the Preferences menu 20 1 Limitations This version offers a simplified user interface to the operator but some functions are not available One measurement channel only All types of measurements are available but they can only be performed with one active measurement channel As a consequence the type Emi Rec Simultaneously is not available No analysis manager The analysis manager is not available in the simplified version It is therefore not possible to obtain results by analysis of audio records No audio signal recording The signal recording mode DAT recorder is not available Only measurement and standard calculations are available No importation of datafiles It is not possible to import datafiles such as 16bit 01dB files WAV files or MP3 files into a measurement session datafile No room criteria Computation of room criteria is not available No averaging It is not possible to average measurement results over several measurements whatever the type of measurement selected Time step of the decays fixed value The time step of the decays used for RT spectrum computation is fixed to 20 milliseconds Only one measurement or computation manager saved automatically There is only one measurement manager and one computation mana
30. Room v com Demo eee MERLE AE 100 Status bar state and information about the acquisition process The measurement configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon Definition of the measurement identifier location and comment Show hide information table Overloads and threshold exceedance display The upper part shows overload LEDs instantaneous on the left max hold on the right The lower part shows a threshold exceedance LED see paragraph 11 2 6 Reset LEDs indication by a simple click on it Define gain and threshold parameters ay A Automatic re scaling of the spectra and time history plots Select the room criterion to display in the spectrum view Enable or disable display of the time history plot and select the frequency band to monitor m ie lE CHAPTER 11 ROOM CRITERIA MEASUREMENTS HL The display type and the display parameters of the active curves are controlled using the horizontal toolbar E in Perform an autorange automatic gain adjustment Start the acquisition process Stop the acquisition in progress Validate current results and store them in a measurement session datafile Cancel current results and start again Display the time decay edition window to adjust values See chapter 12 Enable or disable linked amplitude scales of plots for each active
31. Stage 1 Define the acquisition process In the Acquisition menu select the command Record configuration and select the rearming mode Manual or Automatic when a threshold trigger is used Then use the command Acquisition Record L Stage 2 Acquisition parameters 2 DN 3 Define the acquisition frequency range as well as the maximum duration of an audio record Max frequency Duration ol WM 20000 Hz zj fio l L Stage 3 Gain and Threshold settings Autorange 5 Select the gain settings command manual or automatic autorange These commands are used SS oo to adjust the dynamic range required for the 4 measurement in order to eliminate surcharge and under loads during recording Autorange is used when the sound levels to measure do not vary greatly over the acquisition duration Threshold levels are used to automatically trigger a measurement when a threshold sound level is passed a direction is specified L Stage 4 Recording Audio files Start the acquisition when the set up operations have been carried out Audio data is saved to the computer hard disk in a measurement session datafile CMG 3 2 8 Acquisition en mode MLS Use the command Acquisition MLS acquisition mode to start a measurement of room impulse responses E Stage 1 Definition of MLS acquisition parameters Location Demd Define the parameters relative to the MLS sequence to generate and the acquisition such as the s
32. There are shown as toolbars which size depend on the number of elements added by the operator Three different managers are available Measure Demo gsm H E g F Configure Farametrize Emission Airborne nols Background Reverberatic Measurement manager GSM Analysis manager GSA Standard calculation manager GSC Example of measurement manager Only one manager of each type can be opened at the same time but the contents of each one can be customised by the user Use the commands of the menus Acquisition Analysis and Standard calculations to create open and save different types of managers in standard version Saving a manager All display acquisition and calculation parameters are saved with a given manager Use respectively the command Acquisition Save As Analysis Save As and Standard calculations Save As to save the 3 different types of managers These managers therefore offer a simple and efficient mean to save in a single file all the parameters of a measurement sequence For example a measurement file insulation GSM may contain all the acquisition parameters for emitted noise received noise background noise and reverberation time measurements 6 2 Configuration of a manager ha The number of elements contained in a given manager can be user defined Use the icon EA Configure of a manager to open the dialog box shown below Heasurement manager configuratio
33. a raw audio recording or a set of Ln measurements for example must be stored to allow post processing operations The personal computer may be used as a host to a dedicated instrument Duplication of function however quickly becomes apparent A PC may handle many internal functions of the dedicated instrument more efficiently Benefits of the PC include access to greater storage capacity input output devices higher resolution with a Windows style graphical interface and general integration with the computer based design environment The computer may also take responsibility for system control Note that some existing analysers actually feature an internal Intel x86 PC processor as the system controller The application software determines the type of measurement that the user is able to perform The PC platform controls the user interface graphics storage and post processing functions Here lies the real advantage of a virtual instrument with 01dB application software the user has the possibility to choose the nature of the measurement system It may be a sound level meter a real time analyser a digital tape recorder etc However it should be remembered that for acoustics computer technology is not an end in itself but a tool to provide the most efficient and accurate method of sound and vibration measurement What is a PC based measuring system It is a system comprising hardware resources software modules and a host computer which
34. active measurement session Version 1 016 Total number of iterns 37 i g i Size bytes 227291 The following information is given in this window Start 01 02 00 14 03 18 End 01 02 00 14 26 56 RT 3 Date of creation and last modification EDT Number of data items contained in the datafile Datafile size Equivalent absorption area sample Equivalent absorption area empty room 1 1 1 Attack Decay Sustain Release 4 8 oo gt m Start and end date and time a j Number of data items of each family Definition 1 o This list is updated automatically each time a modification is made into the a oabine a ca i measurement session datafile Leg 2 Room criteria 2 15 2 3 Measurement session comments Cig Exermple CMG general comments on the a meausrement Session Use the command ra Datafile Session comments to input a general pa comment for the active measurement session datafile OK Cancel 15 2 4 Playback audio events Audio MA E Select an audio event in the list and use the command EJ Datafile Replay to L 69 F 69 C playback an audio event through the sound system of the computer signal output of E SYMPHONIE HARMONIE JAZZ or integrated sound card The dialog box shown aside is displayed on screen during playback When a plot is displayed a vertical cursor follows the progress of the playback on this plot 15 2 5 Delete data items Select the data items to remove in the list and us
35. audio items successively and in an automatic manner use the batch command This chapter presents in a general manner how to set up and perform spectra analysis Analysis Demo gsa sy F Configure Parametrize Use the command Analysis New to open a new analysis manager This manager is used to select which analysis will be performed and to configure the analysis parameters of each one of them Analysis manager configuration Demo gsa by ae ae pestering Click on Configure to select which a STE time C Vertical elements will be added to the J Room criteria fe Horona manager In this chapter we select the type of element Spectrum Cancel The manager toolbar then looks like this Analysis Demo gsa Fa f i Refer to chapter 6 for more information on how to use the managers in Configure Farametrize Spectrum dBBATI32 All the display and analysis parameters can be saved in an analysis manager file GSA by using the command Analysis Save As CHAPTER 16 SPECTRA ANALYSIS PAGE 111 DBBATI32 SOFTWARE SUITE USER MANUAL 16 1 Analysis window overview IRM Use the icon 8 Spectrum of the analysis manager to start the analysis window Display parameters toolbar curves to display autoscale time history etc Fh Analysis Spectrum Demo gsa CMG2 i tw fei Channel 1 verall A Hi Hees a Display analysis Command toolbar we ek cant we ae SPRATA ahi a b
36. averaged spectra Partial corresponds to the broad band resolution of the spectrum 1 means Octave 3 means Third octave X unit corresponds to the physical unit of the X axis In this example we are dealing with Frequency in Hertz Hz X Min and X Max correspond respectively to the minimum and maximum frequency bands of acquisition in this example we consider octave bands ranging from 100Hz to 5kHz Nb Elements 1 1 1 31 5 Hz 55 7 56 3 50 7 63 Hz 57 5 58 2 49 4 125 Hz 72 8 73 3 65 6 250 Hz 73 1 74 0 61 2 500 Hz 69 9 71 0 49 0 1 kHz 62 3 63 8 39 4 2 kHz 60 7 61 9 38 0 4 kHz 66 3 67 5 47 2 The data values are given for each frequency band CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 106 DBBATI32 SOFTWARE SUITE USER MANUAL 15 8 5 Customisation of dBBATI32 The software allows the user to customise various parameters for displaying the data 15 8 5 1 Select the colours of the data to display The commands Preferences Colours allows the user to respectively set the colours of the different types of data displayed on screen Graphics hakanud Select in this list the type of data for which you want to modify the colour signal analysed The actual colour associated to this type of data is displayed next to the list Then select with the mouse the new colour in the bottom part of the dialog box Click on OK when all the modifications have been carried out kl the Font Font style Size fonts
37. bordures A4 210 x 297 mm S lectionnez le magasin d entr e voulu Standard Aide Access directly to the printer configuration dialog box by the command File Print Set up and to a preview of the document to print by the command File Print Preview The toolbar of the print preview window allows the user for example to zoom in the preview document Print out options Ea Graphic print out Left margin mm E a When printing graphics the user can set a few additional parameters by the commands Preferences printout options Upper margin mm jo 5 _ Cancel The user can set the margins of the graphic printout frame and the line thickness of the printed curves width mm reo l Height mm hao g Line thickness of printed curves points 5 a CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 102 DBBATI32 SOFTWARE SUITE USER MANUAL 15 8 2 Export data to a word or spreadsheet processor The user may either export results as graphics graphical plots and results listings or export the results as values by the command Edit CTRL C After the copy command of dBBATI32 simply paste Edit Paste the data in a word processor or a spreadsheet processor as shown below __ DEMOBATI FC Listage 5 x J E Attribut Moyen lin Moyen lin Genre E R _ Graphe spectre DEMOBATI FC voe 2 Piste 1 2 Moyenne E1 1 3 Emmitted noise Lin dB Ref 2 00e
38. configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon Definition of the measurement identifier location and comment Show hide information table Overloads and threshold exceedance display The upper part shows overload LEDs instantaneous on the left max hold on the right The lower part shows a threshold exceedance LED see paragraph 7 2 5 Reset LEDs indication by a simple click on it Define gain and threshold parameters Perform an automatic gain adjustment autorange Start Stop the noise generator if the generator option has been activated See paragraph 7 2 3 Start the acquisition process e m Stop the acquisition in progress 0K Validate current results and store them in a measurement session datafile Cancel current results and start again The following icons are displayed if averaging conditions are set at the acquisition parameters stage See paragraph 7 2 4 2 po Store the current averaged spectra in a measurement session datafile Reset the current averaged spectra o Save results in a measurement session datafile The display type and the display parameters of the active curves are controlled using the horizontal toolbar i Automatic re scaling of the spectra and time history plots Enable or disable display of the time history plot and select the frequency band to monitor CHAPTER
39. dual channel measurements in option Type 1 or Type 2 condenser microphone pre polarised externally polarised 200 V Associated preamplifier It should supply the polarisation voltage for the condenser microphone if required Accessories Windshield to protect the microphone for outdoors measurements Extension cable for connection to the acquisition unit Tripods Measurement case for outdoors measurements Type 1 or Type 2 acoustical calibrator to perform calibrated measurements Noise sources Pink and white noise sources in octave bands with or without a controller for air borne sound isolation measurements type GDB95 mE Dodecaheader Omnidirectional noise source type DO12 Standardised tapping machine for impact noise insulation measurements Type N211 Power amplifier M700 Amplified loudspeaker connected to the output of the SYMPHONIE or HARMONIE acquisition unit in order to use the internal signal generator white noise and pink noise Measurement systems Laptop industrial or desktop computer that meets the minimum requirements specified by 01dB with a Windows operating system Acquisition unit connected to the computer type SYMPHONIE or HARMONIE dBBATI32 measurement and processing software The photograph opposite illustrates a 01dB buildings measurement system All the components listed above are available from our Offices Contact your regional sales representative for more inf
40. ee ae TIME This step is dedicated to identifying the section of the decay curve to be taken into account for the RT calculation From the decay curve of the reference band the program calculates the average level between the limits of the study zone It checks the sequences of the decay curve where the level exceeds the average value and retains the largest value This is the sequence on which the following computation will be performed In the figure above the first sequence will be considered CHAPTER 21 APPENDICES PAGE 138 DBBATI32 SOFTWARE SUITE USER MANUAL Determination of the pre sequence noise PRSN sequence starting point SSP and sequence cut off point SCOP Terminology PRSN The pre sequence noise is the noise level prior to the source generation The PRSN is frequency band independent SSP The sequence starting point is the point on the decay where the sequence starts This point is defined in multi band mode The SSP is frequency band independent SCOP The sequence cut off point is the point on the decay curve where the noise source has been interrupted The SCOP is frequency band independent MULTI BAND The multi band mode means that computation is performed taking into account all considered bands with particular weighting The weighting consists in giving more importance to the high frequency bands than the low ones MULTIBAND Considered Sequence Forecast first pomt of the Seguente hed
41. for reverberation time measurements using a stationary signal To initiate the autorange use the Acquisition Autorange command or the touch key function F8 Threshold levels are used to automatically trigger a measurement when a sound level the threshold is passed a direction is specified Stage 5 Setting the display parameters Definition of the display parameters from the Display menu for optimisation the scale display of time histories etc The colours of the graphs may be edited using Preferences Colours Stage 6 Starting the measurement Acquisition is started using the command Acquisition Start F3 Icons found within the measurement window allow the start or ending of the measurement Passing the threshold could also start measurement dBBATI32 also features a pink or white noise generator when used with SYMPHONIE or HARMONIE Stage 7 Decay editing Editing at the end of measurement is possible for time decays whose slope allows reverberation time spectra calculations The decays edition window is automatically displayed on screen by default Stage n 8 Validation of the results and data storage At the end of each measurement the results can either be accepted or rejected For results that are accepted the spectra are stored in a measurement session datafile CMG Refer to chapter 9 et 10 for detailed explanations on RT spectra measurements CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAG
42. frequency Single number value in dBA pink noise or road traffic noise according to the reference used of the input spectra quantities of the input spectra quantities CHAPTER 21 APPENDICES PAGE 143 DBBATI32 SOFTWARE SUITE USER MANUAL ISO standards Sound reduction index R Weighted sound Apparent sound reduction index Rw reduction index R Standard ISO 140 3 NF EN 140 3 ISO 717 1 NF EN 717 1 ISO 140 4 NF EN 140 4 Parameters Frequencies Computation lina A O 1 emitted noise spectrum 1 received noise spectrum 1 RT spectrum Optionally 1 background noise spectrum V Volume of reception room m S Area of the test specimen equal to the test opening m2 Third octaves Equivalent absorption area A per frequency band A 0 16 V Tm V Volume of reception room m T RT reception room Sound reduction index per frequency band R L L 10 Ig S A dB L Emitted noise spectrum L Received noise spectrum S Test area If background noise spectrum as an input there is an additional correction Cf 2 Result per third octave bands over the whole frequency of the input spectra quantities CHAPTER 21 APPENDICES 1 sound reduction index spectrum R Third octaves The sound reduction index spectrum R must contain the frequency bands ranging from100 to 3150 Hz Computation is carried out taking into account the f
43. in dBBATI32 16 3 2 3 Spectra measurements 17 3 2 4 Equipment noise measurements 18 3 2 5 Reverberation time measurements 19 3 2 6 Room criteria measurements 20 327 Signal recording 21 3 2 8 Acquisition en mode MLS 21 3 3 DATA PROCESSING IN DBBATI32 22 4 HARDWARE CONFIGURATION 25 5 MEASUREMENT CHAIN CALIBRATION s es lt i ir 7 6 USE OF THE MANAGERS 29 6 1 INTRODUCTION 29 6 2 CONFIGURATION OF A MANAGER 29 6 3 SET UP OF A MANAGER 30 7 SPECTRA MEASUREMENTS 31 Tai MEASUREMENT WINDOW OVERVIEW 32 T2 MEASUREMENT SET UP 33 Tid Acquisition channel types for spectrum measurement 33 Oe Analysis parameters 33 Taaa Signal characteristics 34 7 2 4 Measurement options 35 7 2 4 1 Acquisition options 35 TRAZ Averaging options 35 Pad Gain and threshold command autorange 36 7 3 DISPLAY SET UP AND STATUS BAR 38 Zad Dynamic settings 38 7 3 2 Status bar 38 7 4 MEASUREMENT PROCESS 39 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT 41 8 1 MEASUREMENT SET UP 42 8 2 MEASUREMENT WINDOW OVERVIEW 43 8 3 DISPLAY SET UP AND STATUS BAR 44 8 3 1 Dynamic settings 44 8 3 2 Display time history 44 8 3 3 Manual determination of the equipment noise level 44 8 3 4 Graphical settings 44 8 3 5 Status bar 45 8 4 MEASUREMENT PROCESS 45 Important Notice Because this software package is modular in structure some of the functions described in this manual may not be available in your copy of the software To u
44. measure the critical distance dc for which speech intelligibility becomes bad Indeed it decays relatively quickly at short distances of the orator then from the distance dc it becomes more or less constant reflected sounds being predominant For conference rooms with absorption coefficients varying from 0 1 to 0 4 the distance dc is between 15 to 20 meters LL RASTI RApid Speech Transmission Index The RASTI method allows us to perform objective measurements of the qualities of speech intelligibility The computation technique is similar to the STI calculation with the following differences The octave bands 500 Hz and 2 kHz are not taken into account All signal to noise ratios Xi are limited to 15 dB The arithmetical average Xi for all Xi are performed RASTI Xi 15 30 There are additional limitations to the validity of RASTI measurements Distortion and non linear cut offs are not considered The emerging pure tones of the background noise outside the frequency range 500 Hz 2 kHz are not allowed It is assumed that the background noise is stationary during the whole measurement Values The STI and RASTI criteria vary between 0 and 1 There is a scale to interpret the intelligibility from the se values Bad Poor Average Good Excellent a 0 0 3 0 45 0 6 0 75 1 References This annex uses extracts from The study report from C LUQUET and J BEAUMONT established for Laboratoire R g
45. must meet the current Standards for corresponding dedicated instruments The field of acoustical measurement is yet dominated by the use of dedicated instruments with standards and tests to reflect this Any technology is redundant without the degree of accuracy required for useful results In parallel with the development of sound level meters standards have been created for each type of acoustical measurement instrument For example the Standards IEC 651 IEC 804 and IEC 1043 and their national equivalents give minimum requirements with respect to dynamic range linearity and frequency response of the instrument Our systems such as SYMPHONIE are type 1 approved in several countries This accuracy rating applies to the use of generic computing hardware that in practice enables any brand of computer to be used that meets current minimum standards In general a fast processor such as the Pentium with an ample storage capacity is preferred CHAPTER 1 DESCRIPTION OF A 01DB STELL PC BASED MEASUREMENT CHAIN PAGE 10 DBBATI32 SOFTWARE SUITE USER MANUAL 1 3 Building acoustics applications For building applications using a 01dB PC based measurement system the following set of components is required to carry out a measurement For example the isolation of air born noise shock reception levels equipment noise or reverberation time measurements The list below is not exhaustive and may vary from application to application Transducer unit
46. of averages the frequency range and the averages measurement mode Frequency oe 20000 Hz The response duration should be carefully selected as it should be adapted to the Mode Single char geometry of the room Make sure that the response duration is long enough in order to obtain a background Acquisition duration noise at the end of the measurement 10 sec 240 ms It is possible to average this response in order to decrease the effect of background Peponi e Cust elt noise O1 sec 280 ms The higher the average number the better the response quality because the influence of random phenomena background noise decreases On the other hand the acquisition duration increases the signal to noise ratio increase by 3 dB when doubling the number of averages Cancel CHAPTER 14 MLS ACQUISITION MODE PAGE 77 DBBATI32 SOFTWARE SUITE USER MANUAL j p sol E Stage 2 Gain settings eae Autorange see paragraph14 2 Select the gain setting command automatic or manual These commands are used to adjust the dynamic range required for the measurement in order to eliminate surcharge and under loads during recording Autorange is used when the sound levels to measure do not vary greatly over the acquisition duration Threshold settings are not available in MLS acquisition mode E Stage 3 Impulse response recordings Start the acquisition when the set up operations have been carried out Impulse responses are saved to the compu
47. performed in a global manner thanks to the implementation of analysis scripts Refer to chapter 14 for details on the procedures allowing the user To generally manage measurement session datafiles open save close print copy paste etc To edit data items in a measurement session date comments type levels etc To perform general calculations on data items addition subtraction averaging recombination RT computation from time decays To plot or list data items To edit print save a test report To sort measurement data items in a measurement session datafile To import 16 bit and DOS datafiles for users of 01dB PC based systems with 16 bit version software packages To export audio signal events at the Microsoft WAV format CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 23 DBBATI32 SOFTWARE SUITE USER MANUAL 4 HARDWARE CONFIGURATION Hardware configuration cannot be performed when a measurement manager is opened Hardware specification and settings are required before any measurement The Hardware configuration option is found under the Acquisition menu of dBBATI32 main window This dialog box see below features various tabs Hardware Peripheral is used to define which hardware elements are used to perform an acquisition hardware peripheral transducers calibrators active channels Remote control is used to define and configure a remote control objec
48. selection in a list corresponding to the last 4 locations completed by the operators and the default locations Location Kitchen Com Demo Measure 35 Measurement x Overall comment on of data acquired or processed lacation the measurement Identification Location It is possible to edit different locations for each measurement channels by Channel Foom E using the syntax Locationl Location2 in the edit zone For example the Channel Office syntax Room Office will affect the location Room to channel 1 and Office to channel 2 This operation may be done with the command ial Commands 3 Identifier The dialog shown aside is displayed on screen Input the locations Da for each active channels and a general comment l Cancel CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 55 DBBATI32 SOFTWARE SUITE USER MANUAL 9 4 Measurement process 9 4 1 Procedure After measurement configuration the user can control the measurement process with the following icons Start the acquisition process F3 Ms The acquisition starts according to the defined acquisition and averaging parameters When a trigger condition is defined with the command Gain and threshold the analyser waits for the trigger event in order to start the measurement sa Stop an acquisition in progress F4 OK Accept current results F7 The measurement results are saved in a measurement session datafile Do not ac
49. study zone Next threshold The vertical toolbar allows the user to define the study zone for the signal and to perform threshold search operations CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 88 DBBATI32 SOFTWARE SUITE USER MANUAL Threshold search The threshold search command command Study Threshold Search allows the user to define the level of the threshold value Level Pal Slope given in physical unit and a slope positive or negative to the Min hlar M threshold condition 5 068e 01 0 000e 00 4 726e 01 gl When the threshold condition has been fulfilled the cursor is located at Ene the threshold exceedance on the graphical view The command allows the user to stop the threshold search and the command allows the user to find the next threshold exceedance The horizontal toolbar allows the user to define display parameters of the graphical view It is possible to use zoom functions to zoom a part of the signal and perform an autoscale for the zoom view The display units depend of the type of graphical view For signals it is possible to select the following display units ADC Displays the dynamic in dB converter It s a relative decibel level The OGB level is the full scale value of the converters i e a sample which has a numerical value of 2 16 32767 corresponds to the OdB value dBADC values are always negative between 0 and 90dB V Dynamic display in Volts
50. the main window either vertically or horizontally CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 108 DBBATI32 SOFTWARE SUITE USER MANUAL 15 8 5 4 Start options Start mode x Launch automatically when starting software The command Preferences Start allows to open automatically some M Last measurement manager elements when opening the application software M Last analysis manager M Last computation manager Cancel 15 8 5 5 Parameters for operations on data items The command Preferences Operations allows the Operations operator to modify the default parameters of the pote op tate AT computation calculations on data items Algebraic rule start dE Dynamic dE Amplitude 40 dB 40 dB 80 dB 5 E Strict Energie 40 dE 40 dE 50 dE l l 4 The choice of the rules algebraic or eee ee ee logarithmic for arithmetic operations is applied to the E addition subtraction and averaging operations Schroeder integration Amplitude 40 dB 40 dB 46 dB Energie 40d6b 40dB 43 dB ri Ba The RT computation parameters apply to RT Cancel calculation operation Remove background nose Refer to paragraph 15 2 8 for further information 15 8 5 6 Measurement session general options Use the command Preferences Measurement session to define general parameters about the management of measurement de ae session datafiles Heasurement s
51. the human ear can only rarely listen to sound decay of greater dynamic The EDT value is compared to the RT 60 value It allows us to estimate the balance between the early sound energy and the overall sound energy The more the energy is concentrated at the beginning of the response sound not useful the greater the sound decay slope and the shorter the EDT The EDT is useful because it takes into account the effect of the first sound reflections in a room and therefore it is closer to the subjective judgement of the listeners Subjective evaluation This criterion appears to be closely related to the reverberation feel of the room although it interpretation remains difficult The EDT is linked to several others sensations such as the sharpness of attacks and their intensity For the same room same volume there is a significant difference between the RT60 and EDT values The EDT varies more quickly as a function of distance than the RT CHAPTER 21 APPENDICES PAGE 151 DBBATI32 SOFTWARE SUITE USER MANUAL 21 5 2 Energy criteria LJ Calculation of cumulated energy and energy criteria The cumulated energy is calculated for a point P by adding the energy of each point located between the beginning of the echogram and the point P If one wishes to calculate the criteria with background noise removal the cumulated energy is calculated while subtracting the background noise energy at each point of the echogram Emission x ___ 2UO
52. the result Subtract all selected data items spectrum audio RT and create a new data item containing the result Average all selected data items spectrum audio RT and create a new data item containing the result The 3 above arithmetic operations may be carried out according to two calculation rules algebraic or logarithmic Use the command Preferences Operations to select which rule will be used see paragraph 15 8 5 5 lulu tna Recombine a third octave spectrum into an octave spectrum autospectrum or time decays only and create a new data item containing the result Ay Compute a RT spectrum from a time decay data item selected in the measurement session Use this function if the RT spectrum corresponding to a given time decay has been deleted from the measurement session Use the command Preferences Operations to select how the RT calculation will be carried out see paragraph 15 8 5 5 CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 87 DBBATI32 SOFTWARE SUITE USER MANUAL 15 3 Plot data items graphics Use the command byl Datafile Plot after selection of one or several data items in the list to display the data in a graphical manner when possible Double click on a data item in the list to also display a graphical view Data items of the following types may be displayed graphically in dBBATI32 Signal edition view Signal recording audio Broad band spectrum and or multispec
53. this value is equal to 20 log 32768 DAC Po in dB with a reference sound pressure level P 20 mPa Transducer type used to acquired the audio data Gain for the input signal CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 86 DBBATI32 SOFTWARE SUITE USER MANUAL 15 2 7 Create new data item Use the command Eil Datafile Create to add a new data item spectrum or RT spectrum to the active measurement session The data values will be edited manually The dialog box shown below appears on screen New item Listage CMG Frequencies Octave Third octaves Cancel Select the type of spectrum level in dB or RT in seconds as well as the frequency resolution octaves or third octaves Click on the OK button Modification of 49 Listage CMG The data item modification dialog box appears on screen Values tab Then input manually the values of the spectrum for each frequency band in seconds or in dB The user is not obliged to input a value for each frequency band It is possible to input a location a comment and to give a particular type to this spectrum by using the other tabs of this data item Refer to paragraph 15 2 6 15 2 8 Operations on data items The following icons allows the operator to perform a serie of operations on data items selected in a measurement session datafile Add all selected data items spectrum audio RT and create a new data item containing
54. 00066 with the right of the C de 2 50 W Icon in topmost 10 dB 0 79 Cancel C 20 dB 0 25 mouse A contextual menu appears Choose the Configuration C 30 dB 0 084 field and set the SYMPHONIE output level The output level is changed in real time if you are playing a noise For more information on SYMPHONIE or HARMONIE for example connection plugs and driver configuration consult the system installation manual CHAPTER 7 SPECTRA MEASUREMENTS PAGE 34 DBBATI32 SOFTWARE SUITE USER MANUAL 7 2 4 Measurement options The configuration of measurement options and if required averaging options can be performed in the Options tab of the measurement set up dialog box Measurement set up Demo gsm Acquisition Options Standard spectrum Emission Airborne nose reception level Impact noize reception level E Background noise Selected items ele Average between channels of the same type Signal storage Storage of specta from each channel M Autorange before each acquisition IY Over several measurements Number of measurements E Automatic validation I Delayed measurement Storage of intermediate spectra Delay s E 7 2 4 1 Acquisition options Define if the audio signal is to be recorded to hard disc Signal storage When this option is activated the audio recording is stored in the active measurement ses
55. 10 a0 L Corrected noise level dB Lsb Combined signal and background noise level Lb Background noise level If the level difference is less than 6 dB for any frequency band the background noise correction is equal to 1 3 dB This correction correspond to a level difference of 6 dB 3 Background noise correction for ISO 140 4 and ISO 140 7 standards If the level difference is less than 10 dB but greater than 6 dB the background noise correction factor is given by the formula L 10 Ig 10 S 10 _ 10 0 L Corrected noise level dB Lsb Combined signal and background noise level Lb Background noise level If the level difference is less than 6 dB for any frequency band the background noise correction is equal to 1 3 dB This correction correspond to a level difference of 6 dB Q Tables of values used for the standard calculations Table 1 Sj reference spectrum values for road traffic noise standard NF 31 057 Sj values per third Sj values per octave band a A octave band dB Note For pink noise reference spectrum this value is constant whatever the frequency band CHAPTER 21 APPENDICES PAGE 149 DBBATI32 SOFTWARE SUITE USER MANUAL Table 2 Cj values for A weighting for computation of single number values in dB A standard NF 31 057 Frequency Cj values per third octave band dB Cj values per octave band dB Frequency Reference value per third octaves dB Reference
56. 18 2 ANALYSIS SET UP 18 2 1 Analysis parameters 18 2 2 Criteria computation parameters 18 2 3 Analysis options 18 3 DISPLAY SET UP AND STATUS BAR 18 3 1 Dynamic settings 18 3 2 Status bar TABLE OF CONTENTS PAGE 7 86 86 86 87 87 88 8 amp 8 90 90 9 92 93 95 96 96 97 97 98 99 101 102 102 103 104 105 107 107 107 107 109 109 109 111 112 113 113 113 114 114 114 115 115 117 118 119 119 119 119 120 120 120 12 122 123 124 125 23 125 125 126 126 126 DBBATI32 SOFTWARE SUITE USER MANUAL 18 4 SELECTION OF RECORDS TO ANALYSE 18 5 ANALYSIS PROCESS 19 STANDARD CALCULATIONS 19 1 COMPUTATION PARAMETERS 19 2 COMPUTATION PROCESS 19 2 1 Selection of the data items 19 2 2 Run the computation 20 SIMPLIFIED USER LEVEL 20 1 LIMITATIONS 20 2 MEASUREMENT MANAGER SET UP SIMPLIFIED VERSION Zh APPENDICES 21 1 EDITION OF THE SOFTWARE LICENCE NUMBER 212 MLS TECHNIQUE 21 3 REVERBERATION TIME CALCULATION ALGORITHM 21 4 STANDARD CALCULATIONS 21 4 1 Insulation 21 4 2 Impact noise 21 4 3 Mechanical equipment noise 21 4 4 Absorption coefficient 21 5 ROOM CRITERIA 21 5 1 Reverberation time 21 5 2 Energy criteria 21 5 3 Intelligibility criteria TABLE OF CONTENTS PAGE 8 127 127 129 129 131 131 132 133 133 134 137 137 137 138 143 143 146 147 148 151 151 152 154 DBBATI32 SOFTWARE SUITE USER MANUAL
57. 240 S Of16 CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 101 DBBATI32 SOFTWARE SUITE USER MANUAL 15 8 Result exploitation and customisation It is possible in dBBATI32 to print directly a data plot and or a result listing and to export the results as graphics or values in standard office spreadsheet and word processor software for further processing and result presentation The user can also customise the way the data is displayed in the software 15 8 1 Printing results Using the commands of the File menu results can be directly printed by dBBATI32 if a printer is connected to the computer of course Use the command File Print CTRL P to display the Print dialog box Specify which pages should be printed the number of copies and the printer driver to use as well as other parameters print quality etc AS dBBATI32 demobati cmg iof x Print ki Ei p i Print Next Page Prey Page Two Page Zoom In Zoe rinter Name OKIPAGE 16n Properties Status Default printer Ready Type OKIPAGE 16n OKIPAGE 16n on Graveur p Properties Where Graveur p200 okipage eh Comment Imprimer Papier Image Filigrane propos de m Print range Cop Magasin papier Ma asin 1 All Nur Orientation p i ritil lt Seve ik fal Portrait Selection C Paysage m Disposition hi en un IY impimne les
58. 6 threshold or alternatively use the associated icon 7 Channel 2 Slow max dB A The gain settings are used to set the dynamic range z for the measurement in order to eliminate over or under charge during acquisition Location Lavatory X Com Demo Measure Stage 5 Setting the display parameters Definition of the display parameters from the Display menu for optimisation the scale display of time histories etc The colours of the graphs may be edited using Preferences Colours Stage 6 Start the acquisition When opening the measurement window the equipment noise level is acquired and memorised It is possible to start the measurement again reset by using the Commands Start F3 Stage 7 End of acquisition The maximum value of the A weighted Slow Leq is displayed on screen for validation since the latest reset Stage 8 Validation of the results and data storage At the end of each measurement the results can either be accepted or rejected If an extraneous noise source affects the measurement result for example a door slamming the user may manually adjust the equipment noise level by using the cursor on the time history plot For results that are accepted the spectra are stored in a measurement session datafile CMG Refer to chapter 8 for detailed explanations on equipment noise measurements CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 18 DBBATI32 SOFTWAR
59. AL 7 2 5 Gain and threshold command autorange Once the measurement set up has been completed from the measurement manager perform the following from within the measurement window Use the command a2 Ml Commands Gains and threshold This dialog box enables the definition of gain and threshold settings These parameters can be used in several ways by the application software All parameters and the available actions may be enabled or disabled according to the acquisition module which calls this command Set up Gains T Linked T Identical Autorange Automatic gain setting Duration Margin dB autorange launch command fo YO Identification of active The gains linked and or measurement channels identical for each active measurement channel Gain view meters and gain adjustment scrolling and associated parameters bar Physical unit used to display gain levels Units e ADC Trigger Delay E A ms Activation of a threshold Selection of the acquisition trigger conditions no trigger use of a threshold condition logical operator Threshold value Slope of the threshold trigger trigger active on a rising or falling slope LJ Gains When the option Linked is active the gains on all active measurement channels are modified The gain setting of one active channel leads to identical modification on all active measurement channels The gains on the active channels are identical
60. D Normalised sound insulation Dn International standard ISO 140 4 Standardised sound insulation Dn T Weighted normalised sound insulation Dn w i Weighted standardised sound insulation Dn T w M Aa AN A Sound reduction index R International standard ISO 140 3 NF EN 140 3 Apparent sound reduction index R International standard ISO 140 4 NF EN 140 4 Weighted sound reduction index Rw i i Weighted apparent sound reduction index R w International standard ISO 717 1 NF EN 717 1 CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 22 DBBATI32 SOFTWARE SUITE USER MANUAL Impact noise Normalised impact sound pressure level LnT A weighted normalised impact sound pressure level LnAT Ee ane N Normalised impact sound pressure level Ln Normalised impact sound pressure level L n International standard ISO 140 6 and ISO 140 7 Standardised impact sound pressure level L nT Weighted normalised impact sound pressure level Ln w Weighted normalised impact sound pressure level L n w International standard ISO 717 2 Weighted standardised impact sound pressure level L nT w Mechanical equipment noise Normalised equipment noise level LeT French standard NF S 31 057 Absorption Absorption coefficient as International standard ISO 354 NF EN 20354 Weighted sound absorption index aw International standard ISO 11654 NF EN 11654 General management of measurement session datafiles Data processing in dBBATI32 can now be
61. D CALCULATIONS PAGE 131 DBBATI32 SOFTWARE SUITE USER MANUAL 19 2 2 Run the computation The computation process is started by clicking on the icons of the computation manager During computation it is possible that some warning and confirmation dialog boxes are displayed A message is displayed for example if the level difference between the received noise spectrum and the background noise spectrum per frequency band is too small Computation time may be long if many criteria have to be computed The results are then saved in the active measurement session data file The added items may be identified using the values in the Family and Type columns The Comment features any eventual warning that may have occurred during computation Listage CMG Main window Fe Gi Autoaspectrum Background noise OV02 00 14 04 71 sound insulation DO French standard OVU2 00 14 03 29 Correct sound insulation Ont OnAT pink noise OV02 00 14 03 29 Correct Sound insulation Onl DnAT road traffic noise 010200 1403 29 Correct Sound insulation Ry Rhy 00200 14 03 29 Correct sound insulation D SO standard O1V 02 00 14 03 29 Correct Sound insulation On s Ori rozon 14 03 29 Correc Once the results are stored in the measurement session datafile it is possible to edit print and display the results see chapter 15 CHAPTER 19 STANDARD CALCULATIONS PAGE 132 DBBATI32 SOFTWARE SUITE USER MANUAL 20 SIMPLIFIED USER LEVEL
62. D COMPUTATION WITH DBBATI32 PAGE 16 DBBATI32 SOFTWARE SUITE USER MANUAL 3 2 3 Spectra measurements This type of acquisition is used for general spectra measurements in octaves and third octaves emitted noise received noise background noise spectra received airborne noise and impact noise spectra simultaneous emitted and received noise spectra spectra with no particular type enabling standardised insulation calculations Access this type of measurement from a measurement manager by the command Acquisition New or if a measurement configuration already exists by the command Acquisition Open Refer to chapter 6 for further explanation on how to use a manager Stepi Use the command Configure of the manager to _MiEEMIcaaER UIN select the types of measurements to activate be r4 g vg w Configure Farametrize Emission Airbome nois Background Rewerberatio Step 2 ae a Pen 4 Use the command Parametrize to select the 1 2 acquisition parameters the generator settings the 3 averaging parameters channel selection settings etc Step 3 Use the icons of the manager toolbar to start a given type of spectra measurement The a a ee measurement window shown aside is aT re ion a ee SP ee ei le Channel 1 Emitted EES le displayed on screen A pu I E i E vege 2 WF Step 4 Setting the dynamic range 6 Use the command Commands Gain and threshold or
63. E 19 DBBATI32 SOFTWARE SUITE USER MANUAL 3 2 6 Room criteria measurements This type of acquisition is used for complete measurement of room criteria RT EDT Clarity Definition ST1 RASTI STI Access this type of measurement from a measurement manager by the command Acquisition New or if a measurement configuration already exists by the command Acquisition Open Refer to chapter 6 for further explanation on how to use a manager 7 Step 1 Use the command Configure of the manager to select the type of measurement Meee room criteria i x ad ngue arametrze Room criteria Step 2 Use the command Parametrize to select 1 2 3 the acquisition signal and computation 5 parameters the averaging parameters etc PF Measure Room criteria Jemo gsm Use the icon room criteria of the manager e 19 fcra oe o 1 0 toolbar to start an acquisition The measurement window shown aside is displayed on screen Step 4 Setting the dynamic range Use the command Commands Gain and threshold or alternatively use the associated icon The gain settings are used to set the dynamic range for the measurement in qas 280 500 tk 2 order to eliminate over or under charge i oa Co during acquisition To initiate an autorange use the Acquisition Autorange command or the touch key function F8 Threshold levels are used to automatically trigger a measurement whe
64. E SUITE USER MANUAL 3 2 5 Reverberation time measurements This provides complete reverberation duration calculation enabling normalised insulation spectra calculations absorption indices etc Access this type of measurement from a measurement manager by the command Acquisition New or if a measurement configuration already exists by the command Acquisition Open Refer to chapter 6 for further explanation on how to use a manager m Step 1 Use the command Configure of the manager to select the type of measurement Measure Dene reverberation time E Configure x Parametize FReverberatio J Step 2 Use the command Parametrize to select the acquisition parameters the 1 2 3 generator settings the averaging parameters etc 5 E Step 3 SG Measure Reverberatia time Demo gsm 2 2 Use the icon reverberation time of ajil i the manager toolbar to start an acquisition The measurement window shown aside is displayed on screen E Step 4 Setting the dynamic range Use the command Commands Gain and threshold or alternatively use the associated icon The gain settings are used to set the dynamic range for the measurement in order to eliminate over or under charge during acquisition 250 500 1k 2k 4k 00 02 0 4 Location Room X Com Demol Measure 100 The Autorange facility is used when the sound level during the measurement is fairly constant This is usually the case
65. Ln 1 Col 23 REC TAK ExT ovR CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 103 DBBATI32 SOFTWARE SUITE USER MANUAL 15 8 3 Principle and configuration of the Copy command The copy command may be configured to work in different ways in dBBATI32 Use the command Preferences Copy options to define how the copy command will work The following dialog box appears on screen By default for all graphical views the command Edit Copy can be used to copy the image of the graphical view The data values cannot be copied Copy of tables of results when copy into the clipboard can be performed as data In some cases for a table of results mainly it is possible to copy either an frac pues UME pre eees image of the table or the data values of the table at the ASCII format Copy the values only The default option Be prompted for the type of copy each time allows the user to display a dialog box for choosing to copy either the image or the values of the table of results Copy the image only When a study zone has been defined for a data item to copy do vou wish to The option Copy the values only can be used to copy directly the data values The option Copy the image only can be used to directly copy the image of the table Copy the whole Copy only the study zone fe Image i Be prompted for the type of copy each Walues EA Wray for copy and exportation of data items at the ASCII format
66. MG PAGE 94 DBBATI32 SOFTWARE SUITE USER MANUAL 15 6 Description and selection of columns in a measurement session window Use the command Datafile Columns to select the columns that will be displayed in the main window of a measurement session data file The dialog box shown below appears on screen Columns displayed Ea Selected elements 13 7 18 Select with the mouse the different column fields that will be displayed in the main window of a measurement session data file Family Type Data type Select all Weighting Unpick all The key Select all allows the user to select all possible columns fields while the key Unpick all allows the user to clear all the column fields qat channel location Duration Period Average type esalutian The table below gives the meaning of column available in a measurement session window Cancel Columns Meaning Selection Sel When selecting several data items in the measurement session window a number is shown in this column that displays the selection order of the data items Identifier of the data item A number This number is incremented from 0 each time a data item is added to the measurement session Set of data items of the same family audio autospectra transfer functions etc Type of a given spectrum emitted noise received noise etc for building acoustics Data type Type of quantity allowing us to define more accurately the data item fo
67. NID items Instanta 22 07 97 01 53 22 Point 1 20 920 1 10240 Audio z 11 07 97 01 51 22 PSYCHO _0 5 Leg MMe 11 07 97 01 51 22 Point 1 20 900 0 020 AA BARK_O 5 Leg ii 54 Point 1 20 900 0 020 m PSYEV_O 5 Leg i a Point 1 20 900 0 020 DA PSYEV_1 5 Leg a i 20 900 0 020 T BGLOBAL O Histo k i HISTO _0 8 Histo 51 i HISTO _0 10 Audio Instanta Li 23 05 97 01 51 22 1710240 Audio Instanta Li 11 07 98 10 15 03 i 1 10240 Audio Instanta Li 15 01 98 01 51 22 i J3 1 10240 Audio Instanta Li 16 12 98 02 14 46 Audio Instanta Li 11 07 97 01 51 22 i Audio 0 22 07 97 01 53 22 i 1 10240 tg PLUS _0 5 13 Audio 0 11 07 98 10 15 03 i 1 10240 PLUS _0 14 15 Audio 0 16 12 96 02 14 46 i 1 10240 Autospectru i 22 07 97 01 53 22 i 20 920 1 10240 Autospectru i S 22 07 97 01 53 22 _ Point 1 A Pa 11 Definition of a request x Name fAudid Conditions a El eC IV Sort elements according to ID E Cancel Instanta 22 07 97 01 53 22 Point 1 20 920 Instanta 23 05 97 01 51 22 Point 1 20 920 TTA Instanta Li 11 07 98 10 15 03 Point 1 20 920 1 10240 Instanta Li 15 01 98 01 51 22 Point 1 20 920 1 10240 Instanta Li 16 12 98 02 14 46 Point 1 20 920 1 10240 Instanta Li 11 07 97 01 51 22 Point 1 20 920 1 10240 PLUS_O 22 07 97 01 53 22 Point 1 20 920 1 10240 PLUS_O 5 13 PLUS_O 11 07 98 10 15 03 Point 1 20 920 1 10240 PLUS_0 14 15 PLUS 0 16 12 96 02 14 46 Point 1 20 920 1 10
68. S DATA SORTING 13 7 Overview of requests edition 15 7 2 Add or modify a request local or global Vode Overview Loui 2 32 Definition principle 15723 List of the values available to define a request 15 7 3 Execute a request 15 8 RESULT EXPLOITATION AND CUSTOMISATION 15 8 1 Printing results 15 8 2 Export data to a word or spreadsheet processor 15 8 3 Principle and configuration of the Copy command 15 8 4 Exportation of data at ASCII format TXT file 15 8 5 Customisation of dBBATI32 15 8 5 1 Select the colours of the data to display 15 8 5 2 Select the fonts of the data to display 15 8 5 3 General functions 15 8 5 4 Start options 15 8 5 5 Parameters for operations on data items 15 8 5 6 Measurement session general options 16 SPECTRA ANALYSIS 16 1 ANALYSIS WINDOW OVERVIEW 16 2 ANALYSIS SET UP 16 2 1 Analysis parameters Averaging and processing options 16 3 DISPLAY SET UP AND STATUS BAR 16 3 1 Dynamic settings 16 3 2 Status bar 16 4 SELECTION OF AUDIO RECORDS TO ANALYSE 16 5 ANALYSIS PROCESS 17 REVERBERATION TIME RT ANALYSIS 17 1 ANALYSIS WINDOW OVERVIEW 7 2 ANALYSIS SET UP 17 2 1 Analysis parameters 17 2 2 RT computation parameters 17 2 3 Processing and averaging parameters 17 3 DISPLAY SET UP AND STATUS BAR 17 3 1 Dynamic settings 17 3 2 Status bar 17 4 SELECTION OF RECORDS TO ANALYSE 17 5 ANALYSIS PROCESS 18 ROOM CRITERIA ANALYSIS 18 1 ANALYSIS WINDOW OVERVIEW
69. TWARE SUITE USER MANUAL 15 3 2 2 Data parameters for the graphical view 4 Define data parameters for the graphical view by the command Plot Parameters The following dialog box appears on screen The tabs allows the user to define the following parameters X axis tab Display parameters setup oy AMIS Data Overall levels Graphics In this tab select the minimum and maximum frequency bands for spectrum display in the graphical view If the All box is ticked the spectrum is displayed over the complete frequency range of acquisition Data tab Display parameters setup avis Data Overall levels Graphics In this tab select if the data should be displayed in physical units Dynamic Lin or in decibels dB Spectral units Weightin Optimise Pw n E Then select the required spectral unit RMS or PWR for broad DynamicidE dB al Min 20 0 Max e0 0 Lin Lee If the Optimise box is not ticked the user may then select the minimum and maximum values of the display dynamic range band spectra and multispectra as well as frequency weighting to apply to the spectral data values Annuler Aide Overall levels tab broad band spectra Display parameters setup Sf avis Data Overall levels Graphics In this tab and for broad band spectra only select the overall levels to compute according to a given frequency weighting displayed in a list Overall levels are then displayed o
70. UITE USER MANUAL 13 SIGNAL ACQUISITION This command is accessible from the menu Acquisition Record The user can record audio signals then perform any type of off line processing operation This command can be used as a digital tape recorder DAT The analysis manager may be used to analyse audio recordings as spectra chapter 16 reverberation time spectra chapter 17 or room criteria chapter 18 13 1 Recording command The Record dialogue box allows the user to define the recording parameters and to carry out an acquisition 2 3 Max frequency Duration 20000 Hz fic es 25 M Fecacranaenes 2 e With the following buttons the user can configure and control recordings fill Start an automatic gain setting autorange Stop the acquisition without saving signal file Show gain view meter and set the gains and threshold parameters Stop recording and save signal file before the end of measurement duration H Be b EE Start recording Exit the signal recording mode After configuration see chapter 4 and calibration see chapter 5 of the measurement chain the user can follow this procedure to carry out signal recordings L Stage 1 Definition of the acquisition mode see paragraph 13 3 Select the menu Acquisition Record configuration and the rearming mode manual or automatic using a threshold trigger Then choose the command Acquisition Record L Stage 2 Setting up the meas
71. VATED NOT ACTIVATED NOT ACTIVATED NOT ACTIVATED Slope CHAPTER 14 MLS ACQUISITION MODE PAGE 79 DBBATI32 SOFTWARE SUITE USER MANUAL 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG Any data acquired in dBBATI32 is stored in a measurement session datafile extension CMG From this datafile the user can perform a given analysis for example calculation of an averaged spectrum from a signal recording From the measurement session window it is possible to print tables of results and graphics to copy and paste data items to a spreadsheet or word processor for further analysis and for editing a measurement report This chapter deals with the following aspects of data management Create Open Save measurement sessions Description of the measurement session window and its toolbars Information window Comments Audio playback sEdit Remove Create data items Operations on data items addition subtraction averaging recombination etc List Plot data items Create Edit Print test reports Edit Execute requests Print Export Copy the results General set up of dBBATI32 15 1 CMG datafile management A measurement session data file with the CMG extension may represent several megabytes of data and dBBATI32 may work simultaneously on several data files 15 1 1 New CMG datafile E To create a new measurement session datafile CMG that is empty click on the icon
72. acquisition module which calls this command Set up Gains T Linked T Identical Identification of active The gains linked and or measurement channels identical for each active measurement channel Gain view meters and gain adjustment scrolling bar Automatic gain setting Duration Margin dB autorange launch command ero and associated parameters Fl Units dB ADC Physical unit used to display gain levels Activation of a threshold Trigger Delay E g ms Direct Thres Operation on Selection of the acquisition trigger conditions no trigger use of a threshold condition logical operator Threshold value Slope of the threshold trigger trigger active on a rising or falling slope LJ Gains When the option Linked is active the gains on all active measurement channels are modified The gain setting of one active channel leads to identical modification on all active measurement channels The gains on the active channels are identical if the option Identical is activated Each setting of one channel is passed to all other active channels This option is only available if the option linked has been chosen SP E Autorange Pe Start automatic gain setting according to the input level on the hardware platform The autorange proceeds as follows during the duration defined in the dialogue box the programme stores the highest reached value and adjust the gain so
73. al and converts it into the unit set in the transducer s characteristics By adjusting the level to the expected level it changes the sensitivity of the transducer By validating it the adjusted value will now become the default value for the next time the program is used Calibration Ed Gain 45 Calibrator J Model Level 940 dB 2 000e 05 Pa Frequency 1000 0 H m Transducer ee J Model GRAS Serial no Access Calibration via the Acquisition menu The input gain and transducer sensitivity may be calibrated from the control panel Values may be modified using the and Adjust buttons Calibration levels can be expressed either in dB or in physical units Approved No Factory sensitivity 5 000e 02 ViPa Current sensitivity 5 000e 02 ViPa VsPa J Cae On validation the system is ready to carry out calibrated dB Physical id measurements Caution Before calibration Verify that the calibration signal remains constant for a sufficiently long period Verify that the gain view meter is correctly positioned neither too weak nor overloading It is preferable to place the calibrator on foam to reduce the effect of vibrations Caution After calibration If for the same transducer calibrator pair the sensitivity after calibration differs greatly from the original sensitivity damage to the microphone may have occurred If t
74. al of the conditions of a request U Definition of a request eve ohana ame audio Channel 2 30s to 1 min the request List of conditions that compose the Sort data items corresponding to the Conditions a ika E AND at AE channel no AND Duration AND Duration a Coherence request Comment Counter Crogss spectrurmi Cumulated histo request according to a an AR M Sort elements according to Duration Cancel parameter After definition of the request name that will appear in the list of requests define one or several conditions that compose the request The columns of the list of conditions of a request allows the user to define the following parameters Logic column Define a Boolean operator AND OR when several conditions have been defined The data items will be displayed when all the conditions of the request are verified operators AND or at least one condition is verified operators OR NEG column negative If this case is activated the data items that will be displayed are the items that do not correspond to the condition Fields column Select the quantity according to which the data items will be sorted A list proposes all the fields that characterise data items family name ID duration etc Op column operation Equality inequality of the quantity selected in the Fields column Value column Value that takes the quantity selected in the Field
75. alternatively use the associated icon ee The gain settings are used to set the dynamic F ES i ERIE range for the measurement in order to o SE eliminate over or under charge during acquisition 125 250 500 1k 2k Ak Location Office v Com Demo a 0 The Autorange facility is used when the sound level during the measurement is fairly constant This is usually the case for airborne sound insulation or impact sound insulation measurements To initiate the autorange use the Acquisition Autorange command or the touch key function F8 Threshold levels are used to automatically trigger a measurement when a sound level the threshold is passed a direction is specified Stage 5 Setting the display parameters Definition of the display parameters from the Display menu for optimisation the scale display of time histories etc The colours of the graphs may be edited using Preferences Colours Stage 6 Starting the measurement Acquisition is started using the command Acquisition Start F3 Icons found within the measurement window allow the start or ending of the measurement Passing the threshold could also start measurement dBBATI32 also features a pink or white noise generator when used with SYMPHONIE or HARMONIE Stage n 7 Validation of the results and data storage At the end of each measurement the results can either be accepted or rejected For results that are accepted the spectra are stored
76. analysis configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon Show hide information table Cancel current results and start again Start analysis End analysis process in batch mode Stop the analysis in progress H Display the decay edition window See chapter 12 Validate current results and store them in a 0R a measurement session datafile The display type and the display parameters of the active curves are controlled using the horizontal toolbar Enable or disable display of the time history plot and H Pola e Versand OF Mier dispiay E select the frequency band to monitor ve pa Select the room criterion to display in the spectrum wura Perform an automatic autoscale to adjust data display ll view ill at the end of the analysis CHAPTER 18 ROOM CRITERIA ANALYSIS PAGE 124 DBBATI32 SOFTWARE SUITE USER MANUAL 18 2 Analysis set up K Parametize Analysis set up can be done by pressing the key Parametrize of the manager 18 2 1 Analysis parameters Use the analysis tab of the analysis set up dialog box Choose between octave and third octave spectrum analysis and define the frequency limits for the analysis 18 2 2 Criteria computation parameters Analysis Criteria computation Options Room criteria Selected items 1 7 Frequencies C Octaves vibe hs Third octaves T Full octaves Max Ec k Cl
77. ape Jl Biase Ld hase Ra eae its ie sen ae data with analysis parameters Do cursors values start stop analysis etc and references 125 250 500 1k Loc jon Test gt Com Demo SEE Mh pui Status bar state and information about the analysis process The analysis configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon The following icons are displayed if averaging conditions are set l Show hide information table at the analysis parameters stage See paragraph 16 2 2 Ms Ie Start analysis sd Stop the analysis in progress Validate current results and store them in a fk measurement session datafile Cancel current results and start again The display type and the display parameters of the active curves are controlled using the horizontal toolbar Store the current averaged spectra in a measurement session datafile End analysis process in batch mode Save results in a measurement session datafile Sle ti Perform an automatic autoscale to adjust data Tn Automatic rescaling OENE a ey display at the end of the analysis H Enable or disable display of the time history plot and select the frequency band to monitor CHAPTER 16 SPECTRA ANALYSIS PAGE 112 DBBATI32 SOFTWARE SUITE USER MANUAL 16 2 Analysis set up ra EAA Analysis set up can be done by pressing the key Parametrize of the manager R
78. asurement window 8 3 1 Dynamic settings tun Use the command Display Autoscale to automatically re scale the plots as a function of the measured noise levels E Use the command Display Link channels to enable or disable linked amplitude scales of plots for each active measurement channel I Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the plots at the end of the acquisition process 8 3 2 Display time history Time history x Use the command e Display Time history to display the time history plot and select the duration to monitor The following dialog M Show time history POX ApPSATS ONSCNEEN Emeen EN zl oes The measurement window is updated on validation 8 3 3 Manual determination of the equipment noise level By default it is the maximum Leq A weighted Slow value over the complete duration of the acquisition that is considered as the equipment noise level However if an unwanted noise event occurred door slamming this value may be manually selected Move the cursor on the time history plot and use the command xa Display Modify equipment noise to manually select the equipment noise level with the cursor for the active channel The indicators are automatically updated 6 Storage of the equipment noise spectrum is not possible if this function is used 8 3 4 Graphical settings Use the command Display Set up to define the display parameters of each type of d
79. ata spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up manually the minimum and maximum limits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot Display or not a grid on the plot Constant range Min 30 0 0 ma g Show Hide cursors values and select channels CHAPTER 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT PAGE 44 DBBATI32 SOFTWARE SUITE USER MANUAL 8 3 5 Status bar Location Elevator com Demo Measure Measurement location Overall comment on the measurement The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by selection in a list corresponding to the last 4 locations completed by the operators and the default locations Identification x Location It is possible to edit different locations for each measurement channels by Channel Room using the syntax Location1 Location2 in the edit zone For example the a e sd syntax Room Office will affect the location Room to channel 1 and Office DE to channel 2 Channel poo This operation may be done with the command ial Commands PEA E Identifier The dialog shown aside is displayed on screen Input the locations for each active channels and a general commen
80. ation time of data items that vary with time Set to 0 when the items are time averaged Average Type of average applied to the item mean maximum minimum Average Duration Averaging duration for a spectrum Where emitted noise Defined location for the measurement session Coord Unit dB Physical unit of the measured data For noise levels Pascal Pa is used As the sound insulation calculation has been performed from spectra in decibels the unit is the decibel PowerUnit PWR The power represents the average of a squared value It s the unit used to determine the power at a given frequency for a determined sinusoidal signal It is expressed in squared units Reference 1 000e 00 Reference value of the measured quantity for level conversion in decibels For sound pressure levels the reference value of the international system is 2x10 Pa Here the reference is equal to 1 because sound insulation calculation has been performed from spectra in decibels the unit is the decibels dB Lin dB Unit of the stored quantity Here the levels are directly given in decibels dB For a time decay for example the values are given in physical units Lin CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 105 DBBATI32 SOFTWARE SUITE USER MANUAL Weight Lin Frequency weighting applied to the data Partial 3 Xunit Hz XMin 100 Hz X Max 5 kHz Partial corresponds to the broad band resolution of the spectrum 1 m
81. ators if a threshold is exceeded the lamp on the left hand side becomes yellow if a threshold is exceeded or if an overload has occurred the lamp on the right hand side becomes red in case of overload L Stage 4 Audio signal recording Start recording after configuring the parameters The recordings are saved on the hard disk of the computer in a measurement session file CMG Use the following commands Start recording according to the defined parameters by using a trigger condition the acquisition starts only if this one is fulfilled Stop recording without saving the audio event Stop recording and save signal file before the end of measurement duration PRE E Exit the signal recording mode An indicator of the dialogue box reflects the recording status Ready The programme waits for acquisition start command Velie Hel umeena The recording is activated but the trigger condition has to be fulfilled for signal recording Recording in progress A recording is in progress CHAPTER 13 SIGNAL ACQUISITION PAGE 74 DBBATI32 SOFTWARE SUITE USER MANUAL 13 2 Gain and threshold command This dialog box enables the definition of gain and threshold settings These parameters can be used in several ways by the application software All parameters and the available actions may be enabled or disabled according to the acquisition module which calls this command Identification of active The gains linked and o
82. ay display the input levels according to three different units dB Phys Display the view meters in physical decibel This is a relative level in dB calculated according to the transducer sensitivity and the reference 0 dB of the transducer type dB ADC Display the view meters in converter decibel This is a relative level in dB The level 0 dB is defined as the full scale of the converter The values in dB ADC are always negative between 0 and 90 dB Unit Display of the view meters in physical units In case the transducer is a pressure microphone the view meter displays the values in Pascals Pa In case the transducer is an accelerometer the view meter displays the values in m s2 CHAPTER 13 SIGNAL ACQUISITION PAGE 75 DBBATI32 SOFTWARE SUITE USER MANUAL E Trigger Define here the trigger parameters used for acquisition Trigger selection Direct to start the measurement immediately after clicking on the start acquisition command or Threshold to start the acquisition with a threshold condition negative or positive defined on the right hand side The programme waits for the threshold when the measurement start command is activated Trigger delay in ms For threshold triggering it is possible to start the acquisition with a pre delay or a post delay in relation to threshold crossing Input this delay or use the arrows up down to increase reduce the value Operation Select a logical Boolean operator for the thr
83. ayed minute 15 7 2 2 Definition principle Follow the instructions below to add a new request 1 NS of a request Family AND 1st measurement channel no AND Duration Duration 2 3 4 7 Audio 2 OhO1 mO0s000 OhOOm30s000 in lI 8 1 Give a name to the current request This name will appear in the list of request in the management dialog box N On the first line of the conditions list click on the Fields column and select the desired quantity in the scrolling list On the same line click on the Op column and select the equality value in the scrolling list On the same line click on the Value column and select a value in a scrolling list or input it manually Repeat steps 2 to 4 for each condition to define Select the boolean operators in the Logic column to define interactions in between the conditions Define the order of the request conditions remove a condition if necessary ano UP E Validate the request CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 98 DBBATI32 SOFTWARE SUITE USER MANUAL 15 7 2 3 List of the values available to define a request Here is a complete table of the different choices available when defining a request Fields Description i Value column column Fields column E E e S Frequency resolution of a broad 1 n octave band spectrum or multispectrum Aanlication Name of the application software PP used to create the item Date of creat
84. bal request to add a new global request for any measurement session that will be opened in the application software Click on the key Edit to modify an existing request selected in the list and click on the key Remove to remove an existing request from the list By default 5 types of requests are available All items Sort data items of a measurement session according to their dates of creation Insulation Display only the data items of the measurement session that deals with Insulation Emitted noise received airborne noise RT background noise and the results of sound insulation calculations Impact noise Display only the data items of the measurement session that deals with Impact noise Received impact noise TR RT background noise and the results of impact noise calculations Mechanical equipment noise Display only the data items of the measurement session that deals with equipment noise equipment noise level RT and standardised equipment noise level Absorption Display only the data items of the measurement session that deals with absorption RT and the results of sound absorption calculations CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 96 DBBATI32 SOFTWARE SUITE USER MANUAL 15 7 2 Add or modify a request local or global 15 7 2 1 0verview Access the dialog box shown below when creating a new request or editing an existing request Navigate displacement remov
85. base utility dBCONFIG32 set up of the signal conditioning options of both the transducer and the hardware peripheral L Stage 2 Selection of acquisition hardware one or more transducer calibrator pair Choose Acquisition Hardware Configuration Select the acquisition platform and associated signal conditioning options the correct transducer and calibrator pairs etc Refer to chapter4 L Stage 3 Calibration Carry out the calibration of the measurement chain before each measurement Command Acquisition Calibration Refer to chapter 5 3 2 2 Types of measurements in dBBATI32 dBBATI32 features different types of measurements analyses and computation The acquisition can be done Either by importation existing audio data files 16 bit files or other 01dB application data files Either by real time acquisition 4 main types of real time acquisition may be identified spectra measurements equipment noise measurements Reverberation time measurements and room criteria measurements Either by direct signal recording on the computer hard disk for later analysis The spectra time decays room criteria and audio recordings obtained from each of these methods are stored in a measurement session datafile CMG to enable airborne or impact sound insulation measurements for example Furthermore each type of measurements listed above can be saved in a measurement manager GSM file CHAPTER 3 ACQUISITION ANALYSIS AN
86. bay aun pease ee Display of overall same graphical i _ _ om aes N a ee levels view SPERE Poe oo T TEN ETRE The toolbar of the graphical view allows the user to perform the following operations Definition Edition of display parameters for the Definition Edition of data parameters for the Es graphical view i graphical view It is possible to display up to 6 data items on the same view if they have the same characteristics periods resolution 15 3 2 1 Display parameters of the graphical view Set up the graphical display parameters by the command ia Plot Plot set up The plot is updated immediately when a modification is made Each plot has its own settings dialog box a modification on one plot does not affect the settings of another plot Display or not the Y axis scale and select the graph dynamic range constant range or set up manually Display or not X axis the minimum and maximum limits scale Display spectrum Cmg Exemple CMG EJ m ARIS Y asis Cursor s Show Hide one or two a M Scale Cis cursors on the plot T Constant range TERE Various l l Show Hide cursors values Min fioo M Show and select channels M Grid a E iow Max 50 0 Zoom E ou Display or not a millimetered grid on the plot Zoom in the plot for the time portion between cursors IN Zoom out the plot OUT CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 90 DBBATI32 SOF
87. be done Cancel The manager toolbar then looks like this Computation Dema gc pe F dH f Configure Parametrize Insulation Impact noite Mechanical Absorption Refer to chapter 6 for more information on how to use the managers in dBBATI32 All the display and acquisition parameters can be saved in a measurement manager file GSC by using the command Standard calculations Save As 19 1 Computation parameters E an Computation parameters can be accessed by pressing the key Parametrize of the manager The dialog box shown below appears on screen Calculation set up Demo gsc Select from each tab the standard indices to Insulation Impact noise Equipment noise Absorption compute ISO standards Laboratory e In Situ ca Bie R w Volume of 50 ne recelvinng room test surface ii 0 irr For some calculations it is possible to modify default computation parameters such a reference RT value or room volumes Selected items 1 1 French standards Wo I Dni OnAT pink Reference AT E DnT 7 DnAT mad 05 kl When only one index is displayed the result is a spectrum Mo i Dn Dnw a E Ine pS t When two indices are displayed side by side the result is a spectrum and the corresponding J Annuler single value quantity M OnT Dn Reference AT Example Mo Raw sound insulation spectrum D M Dnt Dn T rse Normalised insulatio
88. ble to zoom each time decay frame by double clicking within its frame or by pressing the Enter key Double click xy BF Mesure Crit res de salle Demo gsm D croissances Yoie 1 6 Bie ss t o afi Ok gt lt Regression line computed The slope represents the RT value in seconds Active decay used for regression computation Background noise level The search for the arrival of the direct wave and the decay zone is performed automatically by applying a calculation algorithm for room criteria If the signal being studied is not clean the algorithm for searching the decay zones cannot be applied It is therefore required to manually adjust the arrival of the direct wave and maybe the RT calculation limit see example below CHAPTER 12 DECAY EDITION WINDOW ROOM CRITERIA PAGE 71 DBBATI32 SOFTWARE SUITE USER MANUAL The toolbar of this window allows the user to perform the following operations iF Modify the measurement identifier and add comments Select the room criteria to display Define or modify the calculation parameters Define a study zone for a given frequency band dBBATI32 allows the user to exclude any part of the time history such as noise parasites double decay etc that are not useful for the calculation process Automatic re scaling of the plots Link cursors on all the graphical view not active for RT adjustment E Relaunch an automatic criteria calculation accordi
89. cept current results and restart the measurement F6 Time decay edition See chapter 10 Display the time decay adjustment window to adjust manually the decay slope in each frequency band if the RT measurement results are not correct Start Stop the pink noise generator F11 It is possible to generate a pink noise in order to carry out RT measurements with source cut off di mre interrupted stationary signal See paragraph 9 2 3 on the configuration of the generator The first press on this icon activates the generator while the second one stops it It is recommended to set the gain values of the acquisition platform while the generator is switched on in order to avoid overloads The following icons are displayed if averaging conditions are defined see paragraph 9 2 5 2 Store the current averaged RT spectra in a measurement session datafile O Reset the current averaged spectra Save results in a measurement session datafile 9 4 2 Sketches The following sketch summarises the RT measurement process for the 3 modes available in dBBATI32 the states of the generator and the status bar at the different stages of the acquisition process are indicated m1 L Emission duration l l l aiat Pink noise emission ELTETE TTETELELEETETETTETI unnng Interrupted stationary signal oe lle e e a ee a ee a a eee m m m a See paragraph 9 2 5 AGQUISITION See paragraph 9 2 5 Stabilisation 1 See paragraph 9 2 3 De
90. ctaves and 125 2000 Hz in octaves The reference curve cf table 3 is shifted in steps of 1 dB towards the measured curve Dn spectrum until the sum of the unfavourable deviations is as large as possible but no more than 32 0 dB 2 0 dB per frequency band 16 bands in third octaves and 10 0 dB 2 0 dB per frequency band 5 bands in octaves An unfavourable deviation at a particular frequency occurs when the result of measurements is greater than the reference value Only the unfavourable deviations are taken into account The max unfavourable deviation at any frequency should be recorded if it exceeds 8 0 dB After the progressive curve shifting dB is the value of the reference curve at 500 Hz Single number value in dB Daw 1 emitted noise spectrum 1 received noise spectrum 1 RT spectrum Optionally 1 background noise spectrum Octaves or third octaves Per frequency band Dar D 10 Ig T To dB T RT reception room TO Reference RT value If background noise spectrum as an input there is an additional correction cf 3 Result per octave or third octave bands over the whole frequency of the input spectra quantities OOo _ ee Octaves or third octaves The DnT spectrum must contain the frequency bands ranging from100 to 3150 Hz in third octaves and 125 2000 Hz in octaves Computation is carried out taking into accoun
91. cted data items In this case dBBATI32 will calculate the mean RT spectrum for all the selected audio items The intermediate spectra associated with each item may also be saved Refer to paragraph 17 5 for more information on the analysis process CHAPTER 17 REVERBERATION TIME RT ANALYSIS IV Averaging over selected items Ok Annuler PAGE 119 DBBATI32 SOFTWARE SUITE USER MANUAL 17 3 Display set up and status bar 17 3 1 Dynamic settings The horizontal toolbar can be used to set the graphical display parameters of the RT analysis window H Use the command Display Autoscale to automatically re scale the plots as a function of the computed noise levels HI Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the plots at the end of the analysis process Time history x Use the command E Display Time history to display the time history plot and select the frequency band to monitor The following Show tine kision abe leer ote Tick the box Show time history and select the frequency band Frequency A _Cancel_ or overall level to display Use the command Display Set up to define the display parameters of each type of data spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up manually the minimum and maximum li
92. ction of the computed noise levels HI Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the plots at the end of the analysis process Time history Fa Use the command ad Display Time history to display the time history plot and select the frequency band to monitor The following chaise face dialog box appears on screen Tick the box Show time history and select the frequency band Frequency 4 gt _ Cancel or overall level to display Use the command Display Set up to define the display parameters of each type of data spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up manually the minimum and maximum limits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot oi IY Show Display or not a grid Constant range on the plot Min 30 0 0 mss Show Hide cursors values and select channels 16 3 2 Status bar The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by selection in a list corresponding to the last 4 locations completed by the operators and the default locations Location Living FOO com Demo Computation 100 Measurement Overall comment on of data acquired or pr
93. d in the rest of the impulse response The 50ms threshold is mainly used for speech and very little for music Ld Definition We use the criterion Definition D of index 50 which is in fact the ratio E50 Etot 50ms h t dt D50 2 __ 29 Expressed in en 1 dt 0 Q sti We use again an energy ratio 100ms h t dt ST1 10 log in dB rod 0 CHAPTER 21 APPENDICES PAGE 153 DBBATI32 SOFTWARE SUITE USER MANUAL 21 5 3 Intelligibility criteria An intelligibility criteria is essential to characterise the acoustic field of a conference room a theatre and in more general terms any place where speech is important When a speech signal is produced in a room normally or with the aid of a speech amplification system the syllables tends to mask each other because of the multiple reflections and the reverberant sound spoken word so that the listener may not clearly distinguish them When the speech sound level is too weak with respect to the background noise the intelligibility is too low because of this masking effect Various objective criteria are available to qualify the speech intelligibility of a room The C50 Clarity coefficient OR the D50 definition see preceding paragraph can be used to estimate speech intelligibility although they do not take into account the background noise level L sti Speech Transmission Index The STI index is an objective criterion that characterise speech intelligibili
94. d condition for a given measurement channel Threshold level Trigger way The threshold condition will be fulfilled when the input level passes above positive slope or passes below negative slope the threshold value PAGE 37 DBBATI32 SOFTWARE SUITE USER MANUAL 7 3 Display set up and status bar The horizontal toolbar can be used to set the graphical display parameters of the measurement window 7 3 1 Dynamic settings tun Use the command Display Autoscale to automatically re scale the plots as a function of the measured noise levels E Use the command Display Link channels to enable or disable linked amplitude scales of plots for each active measurement channel I Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the plots at the end of the acquisition process Time history Ea A Use the command Display Time history to display the time F Show time history history plot and select the frequency band to monitor The following show time history daia ba a on cect Frequency 4 Cancel Tick the box Show time history and select the frequency band or overall level to display Use the command Display Set up to define the display parameters of each type of data spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up ma
95. dBBATI32 Building acoustics Mi Measure Spectrum Demo gsm Emi Rec simultaneously 2 2 wfe slr oe Channel 1 Emitted noise Ata 58 403 Channel 1 Overall A oo 41 oa e Average B EE 70 70 60 50 40 amp Measure Reverberation time Demo gsm Decays Channel 1 250Hz RT 0 34s Record olx Max frequency Duration Channel 2 Overall AY Hi Es a _ 7 RARA 125 280 5011 i i i i i i i oo o2 os os os 500Hz RT 0 34 s kHz RT 0 33 s 2 kHz RT 0 33 s 4 kHz RT 0 27 s 125 250 500 1k 2k 4k Lint Location Kitchen Bathroc Com Demi Measure 0 Enar Escalier CMG Main window QO Autospectrum noise B 24 02 00 11 16 01 a g n pilot 1 1 Autospectrum Received noise 13 24 02 00 11 16 01 Escalier g n pilot 2 2 Autospectrum Emitted noise 143 24 02 00 11 21 33 Hall t l commande 1 3 Autospectrum Received noise A 24 02 00 11 21 33 Escalier t l commande 2 6 Autospectrum Emitted noise 13 24 02 00 11 32 41 Hall MLS 2 6s 8M 1 7 Autospectrum Received noise 1 3 24 02 00 11 32 41 Escalier MLS 2 6s 8M 2 9 Autospectrum Emitted noise 13 24 02 00 11 38 03 Hall MLS 26s 6M 10 dB 1 10 Autnenacten Received noise 19 24 02 00 11 38 03 Esc Measure Demo gsm gt Todo 3 Background noise 8 2402 00 11 41 52 Esc fle aes D French standard 1 3 24 02 00 11 41 52
96. defined in the batch window the main information bar of the analysis window indicates Batch Stop the analysis in progress F4 STOF Stop the analysis process in batch mode Accept current results F7 The analysis results are saved in a measurement Decay edition See chapter 12 Display the decay PRE E session datafile adjustment window to adjust manually the decay Do not accept current results and restart the slope and direct wave arrival in each frequency band if the analysis results are not correct analysis F6 CHAPTER 18 ROOM CRITERIA ANALYSIS PAGE 127 DBBATI32 SOFTWARE SUITE USER MANUAL 19 STANDARD CALCULATIONS dBBATI32 can performed standard calculations from a variety of national and international standards This chapter presents the use and configuration of the following types of standard calculations Insulation Impact noise Mechanical equipment noise and sound absorption Computation Deno gsc mB g Configure Farametrize Use the command Standard calculations New to open a new computation manager This manager is used to select which calculations will be performed and to configure the calculation parameters of each one of them Computation manager configuration Demo gsc Click on Configure to select which elements yp Insulation will be added to the manager Impact noise Mechanical equipement noise In this chapter we select each type of standard calculations that can
97. dow 9 3 1 Dynamic settings ti Use the command Display Autoscale to automatically re scale the plots as a function of the measured noise levels E Use the command Display Link channels to enable or disable linked amplitude scales of plots for each active measurement channel j Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the plots at the end of the acquisition process Time history Ed E Use the command Display Time history to display the time F Show time history history plot and select the frequency band to monitor The following show time history daoa box appa on sce Frequency 4 Cancel Tick the box Show time history and select the frequency band or overall level to display Use the command Display Set up to define the display parameters of each type of data spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up manually the minimum and maximum limits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot Display or not a grid T Constant range on the plot Show Hide cursors Min 30 0 values and select channels 9 3 2 Status bar The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by
98. e view meter displays the values in Pascals Pa In case the transducer is an accelerometer the view meter displays the values in m s2 CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 66 DBBATI32 SOFTWARE SUITE USER MANUAL E Trigger Define here the trigger parameters used for acquisition not available in MLS mode Trigger selection Direct to start the measurement immediately after clicking on the start acquisition command or Threshold to start the acquisition with a threshold condition negative or positive defined on the right hand side The programme waits for the threshold when the measurement start command is activated Trigger delay in ms For threshold triggering it is possible to start the acquisition with a pre delay or a post delay in relation to threshold crossing Input this delay or use the arrows up down to increase reduce the value Operation Select a logical Boolean operator for the threshold trigger OR to activate the recording if one of the conditions is fulfilled and AND to activate the recording when all conditions are fulfilled E Channels Define an identifier for each active measurement channel and if possible enable or disable the current measurement channel The gain adjustment scrolling bars allows the user to perform manual gain selection Click on the arrows to increase or decrease the gain value by steps of 1dB or unit Click on the scrolling bars to increase or decreas
99. e User manual infogb 01dB com A www 01dB com 01dB Head Office 200 chemin des Ormeaux F 69578 Limonest Cedex FRANCE 33 4 72 52 48 00 33 4 72 52 47 47 01dB Italia s r l Via Antoniana 278 35011 Campodarsego ITALY 39 049 92 00 966 39 049 92 01 239 01dB Inc 31 Jordan Street P O Box 796 Skaneateles NY 13152 USA 1 315 685 3141 1315 685 3194 01dB do Brasil Rua Domingos de Morais 2102 Sala 11 1 Andar Vila Mariana 04036 000 Sad Paulo BRAZIL 55 11 5579 6460 55 11 5579 6610 The specifications are subject to change without notice SYMPHONIE Is a registered trademark of 01dB 01dB Asia Pacific No 9 Jalan USJ10 1D 47620 Petaling Jaya Selangor MALAYSIA 60 3 563 22 633 60 3 563 18 633 MICROSOFT is a registered trademark Microsoft Corporation Windows 95 Windows 98 are trademarks of Microsoft Corporation P83MAN30 04 NOT1109 gb_dBBATI32_4 1_manual_04 doc Updated on October 2003 DBBATI32 SOFTWARE SUITE USER MANUAL TABLE OF CONTENTS 1 DESCRIPTION OF A 01DB STELL PC BASED MEASUREMENT CHAIN 9 1 1 INTRODUCTION 9 Le GENERAL DESCRIPTION 10 1 3 BUILDING ACOUSTICS APPLICATIONS 11 2 NEW FEATURES OB 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 15 cma OVERVIEW OF THE SOFTWARE PACKAGE PRINCIPLE OF OPERATION 15 3 2 MEASURING WITH DBBATI32 16 Jad Common steps 16 3 22 Types of measurements
100. e analysis process with the following icons t Start the analysis F3 The analysis starts according to the defined analysis and averaging parameters If no record has been selected in the measurement session datafile this key is greyed Analysis is performed for Either a single audio record selected in the session datafile the main information bar of the analysis window indicate the name of the session datafile Either for a set of audio records defined in the batch window the main information bar of the analysis window indicates Batch Stop the analysis in progress F4 Accept current results F7 The analysis results are saved in a measurement session datafile Do not accept current results and restart the analysis F6 Time decay edition See chapter 10 Display the time decay adjustment window to adjust manually the decay slope in each frequency band if the RT analysis results are not correct E i E i Stop the analysis process in batch mode The following icons are displayed if averaging conditions are set see paragraph 17 2 3 Store the current averaged spectra in a measurement session datafile fle Save results in a measurement session datafile CHAPTER 17 REVERBERATION TIME RT ANALYSIS PAGE 122 DBBATI32 SOFTWARE SUITE USER MANUAL 18 ROOM CRITERIA ANALYSIS This chapter deals with the analysis of room criteria from existing data items off line These criteria are obtained from echogram c
101. e equivalent absorption area A of the empty room measured per octave bands must be greater than values given in table 5 when multiplied by a factor V 200 7 2 A 0 16 V T m2 The curve of the equivalent sound absorption area of the empty room as a function of frequency must be regular and should not present any holes nor peaks of amplitude greater than 15 of the averaged value of the two adjacent third octave bands Result per third octave bands over the whole Single number value shape indicators if required frequency of the input spectra quantities lwl for example 0 70 MH in option in option lo Result per octave bands ranging from 125 to 4000 Hz CHAPTER 21 APPENDICES PAGE 148 DBBATI32 SOFTWARE SUITE USER MANUAL E Background noise correction 1 Background noise correction for NF S 31 057 French Standard When the level difference between the noise source level and the background noise level lies in the range 5 to 7 dB limits included 1 dB has to be subtracted to the measured values If the level difference is less than 5 dB the measurement is considered as not significant However if the quality requirements of the measurement have been fulfilled the result may be obtained 2 Background noise correction for ISO 140 3 and ISO 140 6 standards If the level difference is less than 15 dB but greater than 6 dB the background noise correction factor is given by the formula L 10 Ig 10 8 10 _
102. e following Snow bime metor EE A Frequency 4 Cancel Tick the box Show time history and select the frequency band or overall level to display Use the command Display Set up to define the display parameters of each type of data spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up manually the minimum and maximum limits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot Display or not a grid on the plot T Constant range Min 30 0 ma E g Show Hide cursors values and select channels 11 3 2 Status bar The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by selection in a list corresponding to the last 4 locations completed by the operators and the default locations Lacation Kitchen Com Demo sass eins Measurement Overall comment on of data acquired or processed lacation the measurement Identification Location It is possible to edit different locations for each measurement channels by using nn Foon EI the syntax Location1 Location2 in the edit zone For example the syntax Room Channel Office Office will affect the location Room to channel 1 and Office to channel 2 ect al This operation may be don
103. e the command T Edit delete or the Suppr function key After confirmation of the deletion the data items are completely removed from the measurement session file Use the command Preferences Measurement sessions not to activate the confirmation of data items removal CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 84 DBBATI32 SOFTWARE SUITE USER MANUAL 15 2 6 Modify data items edition Select one or several data items in the list and use the command l Datafile Modify to edit general parameters of these items The user may modify the following parameters for each item The start date and time The location and comment defined during acquisition The study zone of the item Furthermore it is possible to apply a calibration correction level in dB for some given types of data items Each item is identified in the measurement session by its identifier ID This identifier is a number 15 2 6 1 Edition of items date and time Modification of 20 24 45 Listage CHG ee i the Date tab edit the date and time values corresponding to Date Location Comment Calibration _ i acquisition start of the selected data items Absolute 0170272000 14 18 04 000 E The modification can be performed in an absolute manner direct edition of the date and time or by bringing forward or putting back the original date by a user defined duration format 000 dOOHO1 m0000 a Day hour minutes seconds m
104. e the gain value by steps of 10dB or units Enable Disable the threshold condition Threshold condition for a given measurement channel indicator becomes and stay yellow when one or several threshold trigger conditions are fulfilled Click once on the indicator to reset it Threshold level Trigger way The threshold condition will be fulfilled when the input level passes above positive slope or passes below negative slope the threshold value CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 67 DBBATI32 SOFTWARE SUITE USER MANUAL 11 3 Display set up and status bar The horizontal toolbar can be used to set the graphical display parameters of the measurement window 11 3 1 Dynamic settings tn Use the command Display Autoscale to automatically re scale the plots as a function of the measured noise levels pa Use the command Display Criteria to select the criterion that will be displayed on the spectrum view Only the criteria selected during measurement set up may be displayed E Use the command Display Link channels to enable or disable linked amplitude scales of plots for each active measurement channel ara Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the tuu plots at the end of the acquisition process Time history E4 A Use the command Display Time history to display the time m Show time histon history plot and select the frequency band to monitor Th
105. e with the command ial Commands Channel E Identifier The dialog shown aside is displayed on screen Input the locations a for each active channels and a general comment Bm o z i Cancel CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 68 DBBATI32 SOFTWARE SUITE USER MANUAL 11 4 Measurement process 11 4 1 Procedure After measurement configuration the user can control the measurement process with the following icons Start the acquisition process F3 The acquisition starts according to the defined acquisition and averaging parameters When a trigger condition is defined with the command Gain and threshold the analyser waits for the trigger event in order to start the measurement Stop an acquisition in progress F4 Accept current results F7 The measurement results are saved in a measurement session datafile Do not accept current results and restart the measurement F6 Decay edition See chapter 12 Display the decay adjustment window to adjust manually the decay slope and direct wave arrival in each frequency band if the measurement results are not correct BREE E CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 69 DBBATI32 SOFTWARE SUITE USER MANUAL 11 4 2 Sketches The following sketch summarises the room criteria measurement process for the 3 modes available in dBBATI32 the states of the generator and the status bar at the different stages of the acquisition process are indicated Impulse signal
106. eans Octave 3 means Third octave X unit corresponds to the physical unit of the X axis In this example we are dealing with Frequency in Hertz Hz X Min and X Max correspond respectively to the minimum and maximum frequency bands of acquisition in this example we consider third octave bands ranging from 100Hz to 5kHz Nb Elements 1 Number of data values contained in the item 100 Hz 125 Hz 160 Hz 200 Hz 250Hz 315 Hz 400 Hz 500 Hz 630Hz 800 Hz 1kHz 1 25 kHz 1 6 kHz 2 kHz 2 5 kHz 3 15 kHz4 kHz 5 kHz 16 5 19 5 21 7 28 7 28 5 32 3 35 2 40 8 42 1 43 6 42 3 45 5 47 9 49 8 45 3 43 9 44 4 44 9 The data values are given for each frequency band We give below the example of a data item of an averaged spectrum averaging time of 30 seconds in octave bands Id 0 1 2 Family Autospectrum Autospectrum Autospectrum Data Type Leq Leq Leq Type Begin 10 05 99 14 38 41 10 05 99 14 38 41 10 05 99 14 38 41 End 10 05 99 14 38 41 10 05 99 14 38 41 10 05 99 14 38 41 Period 0 000e 00 0 000e 00 0 000e 00 Average Average Max Min Average Duration 3 000e 01 3 000e 01 3 000e 01 The field average type can be Average for an averaged spectrum Max for a maximum spectrum Min for a minimum spectrum Where 19 19 19 Unit Pa Pa Pa PowerUnit PWR PWR PWR Reference 2 000e 05 2 000e 05 2 000e 05 dB Lin dB dB dB Weight Lin Lin Lin Partial 1 1 1 X unit Hz Hz Hz X Min 31 5 Hz 31 5 Hz 31 5 Hz X Max 4 kHz 4 kHz 4 kHz The three fields above are added for
107. eduction index R w 1 apparent sound reduction index spectrum R Octaves or third octaves The apparent sound reduction index spectrum R must contain the frequency bands ranging from100 to 3150 Hz in third octaves and 125 2000 Hz in octaves Computation is carried out taking into account the frequency bands ranging from 100 to 3150 Hz in third octaves and 125 2000 Hz in octaves The reference curve cf table 3 is shifted in steps of 1 dB towards the measured curve R spectrum until the sum of the unfavourable deviations is as large as possible but no more than 32 0 dB 2 0 dB per frequency band 16 bands in third octaves and 10 0 dB 2 0 dB per frequency band 5 bands in octaves An unfavourable deviation at a particular frequency occurs when the result of measurements is greater than the reference value Only the unfavourable deviations are taken into account The max unfavourable deviation at any frequency should be recorded if it exceeds 8 0 dB After the progressive curve shifting R dB is the value of the reference curve at 500 Hz Single number value in dB Rw PAGE 144 DBBATI32 SOFTWARE SUITE USER MANUAL ISO standards Raw level difference D Normalised sound insulation Dn Weighted normalised sound insulation Dn w Standardised sound insulation Dn T Weighted standardised sound insulation Dn T w Standard ISO 140 4 ISO 140 4 ISO
108. efer to chapter 6 for more information on how to use the managers 16 2 1 Analysis parameters Analysis set up Demo gza Analysis Options Use the analysis tab of the analysis set up dialog box Specku Selected items Tid Choose between octave and third octave spectrum analysis and define the frequency limits for the analysis Frequencies Octaves ale hs m i Third octaves Eull octaves Max Jak x 16 2 2 Averaging and processing options Analysis set up Demo gsa Use the options tab of the analysis set up dialog box Analysis Options Automatic validation of the results When a spectrum is Do a calculated it will be automatically stored in the active data session T Automatic validation This option is useful for a batch analysis of several audio data items see paragraph 16 4 W Averaging over selected items Averaging over all the selected data items In this case dBBATI32 will calculate the mean spectrum for all the selected audio items The intermediate spectra associated with each item may also be saved Refer to paragraph 16 5 for more information on the analysis process CHAPTER 16 SPECTRA ANALYSIS PAGE 113 DBBATI32 SOFTWARE SUITE USER MANUAL 16 3 Display set up and status bar 16 3 1 Dynamic settings The horizontal toolbar can be used to set the graphical display parameters of the analysis window Use the command Display Autoscale to automatically re scale the plots as a fun
109. el The manager toolbar then looks like this Ana I zi Demo g Refer to chapter 6 for more information on how to use the managers in dBBATI32 Z l Configure Farametize Room criteria All the display and analysis parameters can be saved in an analysis manager file GSA by using the command Analysis Save As CHAPTER 18 ROOM CRITERIA ANALYSIS PAGE 123 DBBATI32 SOFTWARE SUITE USER MANUAL 18 1 Analysis window overview F Use the icon KER Room criteria of the analysis manager to start the room criteria analysis window Display parameters toolbar curves to display time history etc BF Analysis Room criteria Demo gsa CMG3 iof x Command toolbar 90 analysis parameters i 5 start stop analysis H Eus AARTI PA ae ASTE 2 Miele tense Ae es oe i i cc ee TERR a fe ee ance eie n oe 4 Sar ge Me etc Berean ae are Gian D o eaae Meet Syme aa MA BBB a ae ane a i 7 2 toe eee minesi TETE ES ET M Sis ee as sod ela Sara e s Pa LA SN SVETI ae Se ee RS eee heer ee ere S mj 50 oe Tre i TI HIE ee bar ave a 4540 ee Petia 2 eae i IUA iy iReeR EEEE IERT T EE ae PERT a ERS l j l j 1 z 00 O02 0 4 0 6 0 6 Location Test gt Channel 1 gt dom Demol Computation 100 ees Display analysis data with cursors values Status bar state and information about the analysis process The
110. ence Refer to chapters 11 and 18 to know how to compute room criteria 21 5 1 Reverberation time Ll RT60 The reverberation time for a given frequency and a given location in space is defined as the time taken for a sound to decay by 60 dB after the sound source is abruptly switched off The decay must be more or less constant The reverberation time is usually estimated between 5 to 35 dB of sound decay Subjective evaluation The RT60 is an indicator of the reverberant feel or sonorousness of a sound field If the reverberation time is too short the acoustic field of a room may be considered as too dry If the reverberation time is too long the acoustic field of a room may be considered as too confuse For speech The RT value must not be too long in order to avoid a masking effect RT 60 lt 1 to 1 3 s For music The RT value must not be long otherwise the sounds may not be distinguished from one another The obtained result is a confuse The influence of RT 60 may not evaluated on its own as it always combine the level of the reverberant part of the echogram with respect to the direct sound L EDT Early Decay Time The Early Decay Time could be considered as a short reverberation time computed on the first 10 dB of the sound decay The EDT is measured between 0 and 10 dB and extrapolated to a 60dB sound decay The idea to limit the RT measurement dynamic to 10 dB comes from the fact that during a concert
111. equence order the number of averages and the acquisition frequency range L Stage 2 Gain settings Autorange i 3 Select the gain setting command automatic or manual These commands are used to adjust the dynamic range required for the measurement in order to eliminate surcharge and under loads during recording Autorange is used when the sound levels to measure do not vary greatly over the acquisition duration L Stage 3 Impulse response recordings Start the acquisition when the set up operations have been carried out Impulse responses are saved to the computer hard disk in a measurement session datafile CMG as an impulse response item Refer to chapter 14 for detailed explanations on MLS acquisition MLS Maximum Length Sequence CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 21 DBBATI32 SOFTWARE SUITE USER MANUAL 3 3 Data processing in dBBATI32 Data processing in dBBATI32 can now be performed with analysis and computation managers The first action for data analysis is to open an existing measurement session command File Open that contains the measurement data items to analyse CMG1 Main window All tems Type Ermitted noise 51 24 Autaspectrum Recelved noise 17 05 00 20 01 36 Autaspectrum Received impact noise 1 1 10 05 00 09 57 39 Autaspectrum Background noise WT 1805 00 09 57 53 Impulsive WwW 1705700 20 01 46 WT 1706 00 20 01 45 WS TOEV00 09 22 31 Avg
112. ers of the manager Measurement set up Demo csm Acquisition RT computatiA Criteria computation Options Select one or several elements of the manager Signal Room criteria Selected items ZAJ Standard Measurement duration r Channels MLS E Mi z M2 F MV Pink noise generator 3 zj C Manual Eaa Automatic Stabilisation duration before acquisition Frequencies 40 Sateen C Octaves Min 125 7 Third octaves I Full octaves Mag 4 k zl Annuler Common settings for one several or all elements of a manager can be performed by selecting multiple elements in the list using the Ctrl key while selecting elements with the mouse Measurement set up Demo gsm X Acqui wath PIT Comer iteria computation Options Example measurement manager If the acquisition frequency range must be the same for all measurement proceed as follow to set up the measurement manager m Signal Selected items 4 5 Measurement duration m Channels a d e T Select all elements in the list upper left hand corner is nT 2 FE with the mouse and the CTRL key pushed down aa 7 Only the settings common to all elements can then be accessed Select the frequency range of acquisition for all the selected elements C Octaves Third octaves I Full octaves Masj5 k Simultaneou
113. es A dialog box is displayed on screen in order to select the datafiles to delete CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 82 DBBATI32 SOFTWARE SUITE USER MANUAL 15 2 Measurement session window overview In the measurement session window the data items are displayed as for a database Each line corresponds to a given type of data and each column corresponds to a given type of information about this data Click on the title of a column to Toolbars of the measurement sort the list of data items session window A dBBati32 Hall Escalier CMG Main window iof x File Edit Acquisition Analysis Standard calculations Datafile Preferences Window w laj x 5 OF ale tela ill eall zel rations FAP sel 27235 ior Famine eRe ae Wate A Neeation The horizontal toolbars allows the user to perform general and data processing Autospectrum Emitted noise 13 24 02 00 11 16 01 Hall g n pilot Autospectrum Received noise 143 24 02 00 11 16 01 Escalier g n pilot operations for the data items contained in Autospectrum Emitted noise 11 3 24 02 00 11 21 33 3 Autospectrum Received noise 1 3 24 02 00 11 21 33 Escalier t l commande the measurement session 6 Autospectrum Emitted noise 3 24 02 00 11 32 41 Hall MLS 2 6s 8M Autospectrum Received noise 1 3 24 02 00 11 32 41 Escalier MLS 2 6s 8M 9 Autospectrum Emitted noise 1 3 24 02 00 11 38
114. eshold trigger OR to activate the recording if one of the conditions is fulfilled and AND to activate the recording when all conditions are fulfilled E Channels Define an identifier for each active measurement channel and if possible enable or disable the current measurement channel The gain adjustment scrolling bars allows the user to perform manual gain selection Click on the arrows to increase or decrease the gain value by steps of 1dB or unit Click on the scrolling bars to increase or decrease the gain value by steps of 10dB or units Enable Disable the threshold condition Threshold condition for a given measurement channel indicator becomes and stay yellow when one or several threshold trigger conditions are fulfilled Click once on the indicator to Trigger way The threshold condition will be reset It Slane r fulfilled when the input level passes above i positive slope or passes below negative slope the threshold value Threshold level 13 3 Record configuration command This command allows defining the rearming type after running a signal record audio a Record configuration x Manual The successive recordings are started manually by the user Automatic E omer The successive audio recordings are started automatically no user intervention Operating only with a threshold IS needed trigger This option is only available in threshold triggering mode Each time the
115. essions preferences M Confirm add items The option Confirm delete items allows the user to display a F Save items in separated files dialog box to confirm or not any item removal operation in the Automatically save all sessions every js minutes active measurement session datafile E The option Confirm add items allows the user to display a dialog Cancel box to confirm or not any item addition in the active measurement session datafile The option save items in separated files allows the user to save the different items of a measurement session files into binary files The binary data of each item are stored in a BID Binary Item Data file and the references of this item are saved into the measurement session itself The option Automatically save all sessions every X minutes allows the user to save all the opened measurement sessions at regular time intervals Therefore a name must be defined when creating a new measurement session CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 109 DBBATI32 SOFTWARE SUITE USER MANUAL 16 SPECTRA ANALYSIS This chapter deals with spectra analysis off line analysis of audio records This mode allows the user to perform a batch analysis of existing audio signals stored in a measurement session datafile as acquired with dBBATI32 to obtain spectra in octaves or third octaves The audio items to analyse are selected in a measurement session datafile To analyse several
116. esult per third octave bands over Single number value in dB Result per octave or third octave the whole frequency of the input bands over the whole frequency of spectra quantities Lea the input spectra quantities CHAPTER 21 APPENDICES PAGE 146 DBBATI32 SOFTWARE SUITE USER MANUAL ISO standard Weighted normalised impact sound pressure level L n w Standardised impact sound pressure level L nT Weighted standardised impact sound pressure level L nT w Standard ISO 717 2 ISO 140 7 ISO 717 2 Parameters Reference RT Frequencies Computation 1 normalised impact sound pressure level L n spectrum Octaves or third octaves The L n spectrum must contain the frequency bands ranging from100 to 3150 Hz in third octaves or 125 2000 Hz in octaves Computation is carried out taking into account the frequency bands ranging from 100 to 3150 Hz in third octaves and 125 2000 Hz in octaves The reference curve cf table 4 is shifted in steps of 1 dB towards the measured curve L n spectrum until the sum of the unfavourable deviations is as large as possible but no more than 32 0 dB 2 0 dB per frequency band 16 bands in third octaves and 10 0 dB 2 0 dB per frequency band 5 bands in octaves An unfavourable deviation at a particular frequency occurs when the result of measurements is less than the reference value Only the unfavourable deviations are taken into account After the progress
117. etize Mechanical il gd Airbome nose reception level i Impact noe reception level bi Background noise e Reverberation time D Roon cries LL Refer to chapter 6 for more j Emi Rec simultaneously Cancel information on how to use the managers in dBBATI32 All the display and acquisition parameters can be saved in a measurement manager file GSM by using the command Acquisition Save As CHAPTER 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT PAGE 41 DBBATI32 SOFTWARE SUITE USER MANUAL 8 1 Measurement set up a EN Measurement set up can be done by pressing the key Parametrize of the manager The dialog box shown below appears on screen E Acquisition tab Channels Measurement set up Demo gsm X Acquisition Opti f Options Define the active measurement channels the acquisition platform input lines that will be used for spectrum acquisition see chapter 4 Mechanical equipement noise Selected items Teil r Channels Frequencies If the equipment noise spectrum is saved in the options tab choose between octave m Frequencies C Octaves Min 100 z and third octave spectrum analysis and ee l eae Ihdoctaves uaa define the frequency limits for the analysis This setting does not affect the Leq EEEN measurement frequency range E Options tab Measurement set up Demo gsm Storage of the spectrum Acquisition Options Mechanical e
118. evel correction etc Transfer data from a sound level meter Create a data item Level or RT spectrum Delete the selected items GE A a Activate the next window of dBBATI32 CTRL TAB P z Open an existing measurement manager GSM Access batch processing analysis Open an existing analysis manager GSA Add the selected items Open an existing computation manager GSC Subtract the selected items Display an information window about the measurement Average the selected items session Edit the general comment of the measurement session Recombine in octaves a third octave spectrum Automatically generate a test report Compute RT spectrum from time decays Open the index on the on line help system Contextual help accessed by the F1 key E A S oe Plot graphics the selected data items All items date type Sort data items according to the selected request Automatically adjust the width of each column Automatically adjust the size of the measurement Or Edition of requests i i session window HE BS ESERSE H Select the window columns to display CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 83 DBBATI32 SOFTWARE SUITE USER MANUAL 15 2 2 Measurement session information window i Listage CMG Information iof xi E I l EET E AA Use the command Datafile Session Information to display the Last save date 18 05 00 17 02 06 information window of the
119. everberation time calculation are known Depending upon the RT calculation parameters the integration as described by Schrdeder and the POSN subtraction may be performed prior to calculating the RT values When using a source cut off noise the next step is bypassed Applying integration SCHROEDER theorem and POSN subtraction when using an impulsive noise The 01dB program allows you to perform an integration as defined by SCHROEDER in 1965 as well as POSN subtraction when using an impulsive noise As a matter of fact the data measured from an impulsive noise represents the impulsive response of the room and should not be used directly to calculate the reverberation time When using the integration it is also recommended that the POSN subtraction be performed in order to obtain reliable results The program allows you to perform the integration without POSN subtraction and in this case the results are the user s responsibility In 1965 SCHROEDER proved the identity between the square of the impulsive response of a room and the average of the decay curves due to a source cut off CHAPTER 21 APPENDICES PAGE 140 DBBATI32 SOFTWARE SUITE USER MANUAL srt y N re 2esctds It is expressed by the following formula al 3 C where S2 t the mean sound intensity of the decay at t r t the impulsive response t 0 is the source cut off N represents the source sound power As the integral has to be calculated to the
120. f measured data into an input voltage and the reverse process after data analysis to display the results A transducer must be prescribed to each active channel Calibrator The calibrator configuration allows the user to perform the calibration routine which adjusts the transfer function of the transducer in order to perform calibrated and accurate measurements A calibrator must be declared for each active channel To enable direct power supply of a transducer from a SYMPHONIE or HARMONIE unit or a JAZZ acquisition card define the same option s for the transducer s and for the hardware platform Configuration command For more information concerning hardware configuration refer to the getting started manual delivered with your measurement system CHAPTER 4 HARDWARE CONFIGURATION PAGE 25 DBBATI32 SOFTWARE SUITE USER MANUAL 5 MEASUREMENT CHAIN CALIBRATION Calibration is recommended before every measurement Calibration guarantees the reliability of the results Calibration affects the sensitivity of the selected transducer by adjusting it as a function of measured and expected values defined by the frequency and level characteristics of the calibrator The calibrators and transducers are defined by using dBCONFIG32 and they are selected using the Hardware configuration command in the Acquisition menu The current calibration is done using Leq over a 125 millisecond period It measures the Leq value of the input sign
121. f the The display type and the display parameters of the active curves are controlled using the horizontal toolbar tllu Automatic re scaling of the spectra and time Enable or disable linked amplitude scales of plots history plots for each active measurement channel H Enable or disable display of the time history plot ti Perform an automatic autoscale to adjust data and select the frequency band to monitor ga display at the end of the measurement CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 48 DBBATI32 SOFTWARE SUITE USER MANUAL 9 2 Measurement set up Fe EN Measurement set up can be done by pressing the key Parametrize of the manager The dialog box shown below appears on screen Measurement set up Demo gsm Acquisition RT computation Options Reverberation time Time step of decays me z0 ka Signal Interrupt stationary Selected items Punk Measurement duration C MLS m I Pink noise generator C Manual i Automatic Stabilisation duration before acquisition jan m completed C Octaves i i D Miri fioo Emission duration f Third octaves gt z ji 0 completed I Full octaves ia 5 k al Refer to chapter 6 for more information on the use of managers 9 2 1 Acquisition channel types for RT measurement Channels Define the active measurement channels the acquisition platform input Iw reverberation time zj lines that will be used for spectrum acquisi
122. ger in the simplified version There contents cannot be modified as all possible measurement or computations are displayed in the toolbars Start a manager by simple click on an icon of the main toolbar CHAPTER 20 SIMPLIFIED USER LEVEL PAGE 133 DBBATI32 SOFTWARE SUITE USER MANUAL 20 2 Measurement manager set up simplified version In simplified mode the following measurements may be performed Standard spectrum Background noise spectrum _Emitted noise spectrum Mechanical equipment noise spectrum Received airborne noise spectrum Reverberation time spectrum Received impact noise spectrum Pan Measurement set up can be done by pressing the key Parametrize of the manager The dialog box shown below appears on screen Refer to the corresponding chapters in standard mode for more detailed explanations on how to configure and perform measurements in dBBATI32 Measurement set up X Signal m Frequencies Spectra RT o Octaves Min 125 Poe Third octaves D A a Standard Interrupted stationary Impulse Full octaves Max 4 k C MLS MLS RT computation Start dB Dynamic dB Measurement 5 iH Measurement 3 i 5 7 2 B Stret l Schroeder integration i Remove Ga kal und nose Options MV Store time decays MV Store H AC noise spectrum V Pink noise generator C Manual Automatic erate Stabilisation d
123. he measured values are not correct but the calibration value is OK it could mean that the sensitivity of the microphone is correct only at 1 000 Hz Check the microphone membrane A microphone is very fragile equipment A fall of 10 cm may damage the microphone membrane As general rule if the measured value in dB varies by 1 5 dB from the value that would be measured with the microphone according to the original sensitivity see calibration data sheet consider your microphone as faulty Example For a microphone that as a factory sensitivity of 50 mV Pa and a calibrator that delivers 94 dB at 1000 Hz The microphone ts able to perform correct measurements if The measured calibration level lies between 92 5 dB and 95 5 dB The current microphone sensitivity lies between around 40 mV Pa and 60 mV Pa multiply or divide the original value by a factor of 1 1885 For greater or lower microphone sensitivities consider the microphone as faulty Return it to your 01dB agent CHAPTER 5 MEASUREMENT CHAIN CALIBRATION PAGE 27 DBBATI32 SOFTWARE SUITE USER MANUAL 6 USE OF THE MANAGERS 6 1 Introduction dBBATI32 allows the user to quickly configure a measurement analysis or computation and to carry out measurements in batch mode immediately thanks to a simple and powerful user interface These managers are the key elements used at all time in order to perform a measurement an analysis or standardised calculations
124. ick on the Parametrize key of the measurement manager and select the Criteria computation tab The computation of intelligibility criteria account for the signal to noise ratios per frequency bands It is however to manually inputs these values Analysis set up Demo gsa X Analysis Criteria computation Options Room criteria Selected items TAi Intelligibility criteria M STI M RASTI r Signal Noise ratios Hz 125 250 500 tk 2X 4 k 8k dB fioo fioo fioo fioo fioo 100 fioo Infinite 18 2 3 Analysis options The configuration of measurement options can be performed in the Options Quality criteria Remove background noise V Reverberation time Start dB Dynamic dB 5 v 30 v T Strict M EDT l Schroeder integration M Clarity feo ms M Definition 50 ms M ST1 Annuler tab of the analysis set up dialog box By default background noise is considered neglectable thus having a signal to noise ratio infinite 100 LL Refer to paragraph 21 5 for the calculation principle and definition of room criteria Analysis set up Demo gsa Analysis Criteria computation Options Poom centena Selected items 1 1 Define if decays are to be recorded into the measurement session for later analysis Automatic validation of the results This option is useful for a batch analysis of several data items see paragraph 18 4 M S
125. if the option Identical is activated Each setting of one channel is passed to all other active channels This option is only available if the option linked has been chosen ae E Autorange 00 Start automatic gain setting according to the input level on the hardware platform The autorange proceeds as follows during the duration defined in the dialogue box the programme stores the highest reached value and adjust the gain so that this value is located x dB margin defined in the dialogue box below that maximum measured value L Units Selection of the display unit of the input level The gain view meters may display the input levels according to three different units dB Phys Display the view meters in physical decibel This is a relative level in dB calculated according to the transducer sensitivity and the reference 0 dB of the transducer type dB ADC Display the view meters in converter decibel This is a relative level in dB The level O dB is defined as the full scale of the converter The values in dB ADC are always negative between 0 and 90 dB Unit Display of the view meters in physical units In case the transducer is a pressure microphone the view meter displays the values in Pascals Pa In case the transducer is an accelerometer the view meter displays the values in m s2 CHAPTER 7 SPECTRA MEASUREMENTS PAGE 36 DBBATI32 SOFTWARE SUITE USER MANUAL E Trigger Define here the trigger parameters used fo
126. ignal to noise ratio increase by 3 dB when doubling the number of averages Refer to annex 21 2 for more details on the MLS acquisition Refer to paragraph 21 5 for the calculation principle of room criteria Refer to paragraph 11 4 for detailed explanations on the measurement process L General remark SYMPHONIE The output level of the signal can be set by the SYMPHONIE icon driver from the Windows task bar Keep Power W Transmission l i M Analog part Click on the icon BA Symphonie 00066 with the right of the mouse A contextual menu appears Choose the Configuration field and set the SYMPHONIE output level The output level is changed in real time if you are playing a noise SYHMPHOWNIE Configuration Ea Output level OdB 2 50 10 dB 0 79 C 20 dB 0 25 C 30 dB 0 08 W Icon in topmost Cancel For more information on SYMPHONIE or HARMONIE for example connection plugs and driver configuration consult the system installation manual CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 64 DBBATI32 SOFTWARE SUITE USER MANUAL 11 2 4 Criteria computation parameters E ES Click on the Parametrize key of the measurement manager and select the criteria computation tab This dialog box is used to select the criteria that will be computed from the measured impulse response Measurement set up Demo gsm Acquisition Criteria computation Options Quality criteria
127. illiseconds The user has to confirm each date and time modification ic Avancer de Modification of 20 24 45 Listage CHG Study Type Informations mpm m L ti 3 15 2 6 2 Edition of items location and comments Hee ocation Comment Calibration Selection Text In the Location tab edit the comment relative to the location of the measurement channel In the Comment tab edit the comment relative to for example the measurement conditions Dema 2d 45 15 2 6 3 Edition of items Level conversion Modification of 20 24 45 Lizstage CHG Study Type Informations Date Location Comment Calibration Selection In the calibration tab define a calibration adjustment for the selected data items Level conversion 394 00 dE W520 is A calibration level conversion in decibels is applied globally with a resolution of 0 01dB Click on the key Restore original level value to cancel the level correction OF Annuler CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 85 DBBATI32 SOFTWARE SUITE USER MANUAL 15 2 6 4 Edition of items study zone Modification of 20 24 45 Listage CHG Study Type Informations Date Location Comment Calibration In the study tab select the study zone for any subsequent aay selection analysis Level conversion 94 00 dB Click on the Complete study key to select the complete duration of the da
128. in a measurement session datafile CMG Refer to chapter 7 for detailed explanations on spectra measurements CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 17 DBBATI32 SOFTWARE SUITE USER MANUAL 3 2 4 Equipment noise measurements This type of acquisition is used for equipment noise measurements maximum value of the A weighted Leq time history using a Slow time constant over a user defined duration Equipment noise spectra can also be saved instantaneous spectrum at the time of the maximum A weighted Leq value Access this type of measurement from a measurement manager by the command Acquisition New or if a measurement configuration already exists by the command Acquisition Open Refer to chapter 6 for further explanation on how to use a manager m Step 1 Measure Denmo gem Use the command Configure of the manager to select the type of measurement a mechanical equipment noise Configure 1 2 3 Step 2 Use the command Parametrize to select the acquisition parameters the generator settings the averaging parameters channel selection settings etc 5 Step 3 Use the icon mechanical equipment noise of the fill Measure Mechanical oq Smantinasss EDEN manager toolbar to start an acquisition The E wje fe saa l measurement window shown aside is displayed on aE screen a 4 Channel 1 Slow dB A E Step 4 Setting the dynamic range Use the command Commands Gain and
129. ine a delay before starting a measurement so that the operator may leave the room during the measurement process Refer to paragraph 11 4 for more information on the measurement process CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 65 DBBATI32 SOFTWARE SUITE USER MANUAL 11 2 6 Gain and threshold command autorange Once the measurement set up has been completed from the measurement manager perform the following from within the measurement window Use the command a2 Ml Commands Gains and threshold This dialog box enables the definition of gain and threshold settings These parameters can be used in several ways by the application software All parameters and the available actions may be enabled or disabled according to the acquisition module which calls this command Set up Gains T Linked T Identical Autorange Automatic gain setting Duration Margin dB autorange launch command fo YO Identification of active The gains linked and or measurement channels identical for each active measurement channel Gain view meters and gain adjustment scrolling and associated parameters bar Physical unit used to display gain levels Units e ADC Trigger Delay E A ms Activation of a threshold Selection of the acquisition trigger conditions no trigger use of a threshold condition logical operator Threshold value Slope of the threshold trigger trigger active on a rising o
130. infinite according to the formula it is not possible to perform a reliable RT calculation without using the POSN subtraction as the recording is finite The figure below shows the principle of the integration using the POSN subtraction LEVEL decay l decay Extended surface T An estimated decay curve is defined using a linear regression between the SCOP and SEP points This decay curve is extended to infinity Therefore the integration between the SCOP point and infinity is possible as the surface of the triangle extended surface is known At the end of the process the reliable decay curves are completely defined and the RT determination is applied CHAPTER 21 APPENDICES PAGE 141 DBBATI32 SOFTWARE SUITE USER MANUAL Reverberation time calculation according to the user defined parameters User defined parameters X Start dB Defines the regression starting point RSP on the decay curve to be considered for the linear regression calculation The RSP point is defined as being the point on the decay which is X decibels below the level of the SCOP The RSP point is frequency dependent Y Dynamic dB Defines the regression ending point REP The REP point is defined as being the point on the decay curve which is Y decibels below the RSP point The REP point is frequency dependent Strict The strict option disables the calculation on the band where it is not possible to define the REP point i e if the decays d
131. ion 1 1 Date OV02 00 14 04 13 The levels are listed in decibels dB PWR location drh Overall levels are shown at the bottom of the table Comments dfh Channel 1 The toolbar of the table of results allows the user to perform the following dB operations 513 497 Definition Edition of data parameters for the table of results 490 Sle l l l 555 Automatically adjust the size of the window SBB Overall Lin 61 1 CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 92 DBBATI32 SOFTWARE SUITE USER MANUAL 15 5 Automatic test reports It is possible to create edit and print test reports automatically after performing standard calculations in dBBATI32 These test reports comply with the specifications of the ISO standards currently in use Refer to paragraph 21 4 for details on the standards and the computation methods used Select a data item in the measurement session datafile Select in the measurement session data file a data item that result from a standard calculation Listage CMG Main window All data items obtained from the computation manager Fratnems E 22 FER set insulation impact noise mechanical equipment noise 1D Family sd Type xai Date QO Autospectrum 01 02 00 14 03 16 absorption may be used to create automatically a test _ Autospactrum Emitted noise 01 02 00 14 03 29 34 Sound insulation D French standard 01 02 00 14 03 29 report 35 Sound insulat
132. ion DnT DnAT pink noise 01 02 00 14 03 29 36 Sound insulation DnT DnAT road traffic noise 01 02 00 14 03 29 r y 7 37 Sound insulation R s Rw i 01 02 00 14 03 29 The icon is activated when a compatible data item 38 Sound insulation D ISO standard 01 02 00 14 03 29 for the creation of a test report has been selected aCe Po EF Autospectrum Received noise 01 02 00 14 03 59 Absorption The item Al equivalent sound absorption of an empty room cannot be used to create a test report because this item is only used to check that other sound absorption indices are valid The two RT items that have been used for computation in the report must be saved in the measurement session datafile Generation of the test report Use the command Datafile Test report to automatically generate a test report in HTML format FTA Listage CMG Test reports _ 5 xi al The test report window features some fields that filled automatically by Field measurements of airborne sound insulation between rooms dBBATI32 and other ones that the user Client Jonn Goodman Testdate 01 0200 has to complete to identify the The fields that appear a aan A a measurement In lig ht yel low may be Description and identification of the building test rig and measurement direction modified by the user S a The Description field is automatically Volume of emission room m3 80 E EET 100 completed with the location and Dnt Medines 450
133. ion of the item Duration of an item Set of data items of the same family audio autospectra transfer functions etc Type of quantity allowing us to define more accurately the data item Data type for a Fast sound pressure level the family would be Leq and the data type will be Fast X axis l l quantity Physical unit of the X axis Y1 axis Physical unit of the Y axis anny For cross spectra Y1 corresponds to the physical unit of the first item and Y2 axis Y2 corresponds to the physical unit quantity of the second item used to calculate the cross spectrum Identifier of the data item A number This number is incremented from 0 each time a data item is added to the measurement session Location defined during acquisition Channel 1 by default For cross spectra it corresponds to the location of the first measurement channel Type of averaging method used to a ae La compute the data item ist meas Number of the measurement Channel no channel used to create the item ist channel location For cross spectra the number of each channel used to calculate the cross spectrum is described 2nd meas Channel no Name of the analysis that created this data item It is the name of the operator for a off line analysis and the name of the acquired quantity for a real time measurement n 1 3 6 12 24 48 Manual input Manual input day month year hh mm ss 01 02 1999 16 42 05 Manual input ddd hh mm ss
134. ional des Ponts et Chauss es of Strasbourg France on room acoustics It itself refer to the work of J P VIAN and R CROCOMBETTE Master in acoustics carried out at the CSTB Centre Scientifique et Technique du Batiment de Grenoble and the work of J P JULLIEN and A C SEVERNE from IRCAM in Paris The thesis realised by V FAVRE pour lEcole Sup rieure de M canique de Marseille 1998 CHAPTER 21 APPENDICES PAGE 155
135. ique The MLS method Maximum Length Sequence can be used for all types of measurements excepted equipment noise The use of this technique is througoutly explained in the chapters relative to acquisition Refer as well to annex 21 2 Received noise measurements are treated differently for airborne and impact noises Refer to chapter 7 for further information m Room criteria measurements Refer to chapter 11 for further information Pink noise generator remotely controlled stabilisation delay of the noise in the room under test automatic cut off of the generator for reverberation time measurements Delayed measurements User defined delay for the operator to leave the room under test LJ Standard calculations In this version of dBBATI32 many building acoustics standards are taken into account calculation of ISO 717 criteria for example Refer to chapter 16 for further information L Edition of test reports It is now possible to create edit and print tests reports featuring standard calculations directly from the software package These reports comply with the specifications of ISO standards Refer to paragraph 15 5 for further information CHAPTER 2 NEW FEATURES PAGE 14 DBBATI32 SOFTWARE SUITE USER MANUAL 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 3 1 Overview of the software package principle of operation Measurement chain configuration dBCONFIG32 dBBATI32 hardware config
136. ition RT computation Options Emission Airborne noise reception level Background noise Reverberation time Selected items it Average Decay storage T between channels of the same type Signal storage Storage of spectra from each channel MV Autorange before each acquisition IV Over several measurements Number of measurements Ih MV Automatic validation V Delayed measurement l Storage of intermediate spectra Delay s 5 Automatic validation if acquisition ad v driven by generator or MLS Annuler 9 2 5 1 Acquisition options m Define if time decays are to be recorded into the measurement session for l Decay storage later analysis R j Signal storage m Define if the audio signal is to be recorded to hard disc M Autorange before each acquisition When this option is activated the audio recording is stored in the active f Automatic validation measurement session datafile at the end of the acquisition Perform an autorange automatically before each measurement i Delayed measurement Bo E m Automatic validation of the results Useful when averaging over several Paen el E E measurements Define a delay before starting a measurement so that the operator may leave the room during the measurement process Refer to paragraph 9 4 for more information on the measurement process 9 2 5 2 Averaging options Average Averaging between channels of the same type
137. ition starts according to the defined acquisition and averaging parameters When a trigger condition is defined with the command Gain and threshold the analyser waits for the trigger event in order to start the measurement m Stop an acquisition in progress F4 Accept current results F7 OR r F7 The measurement results are saved in a measurement session datafile Do not accept current results and restart the measurement F6 Start Stop the pink noise generator F11 It is possible to generate a pink noise in order to carry out received or emitted noise spectra JA measurements See paragraph 7 2 3 on the configuration of the generator The first press on this iita icon activates the generator while the second one stops it It is recommended to set the gain values of the acquisition platform while the generator is switched on in order to avoid overloads The following icons are displayed if averaging conditions are set at the acquisition parameters stage see paragraph 7 2 4 2 Store the current averaged spectra in a measurement session datafile 2 0 Reset the current averaged spectra Save results in a measurement session datafile Ll The following sketch summarises the state of the generator and the status bar at the different stages of the acquisition process This process Is not valid for received impact noise and background noise measurements The states Wait delay Autorange and Stabilisation of the genera
138. ive curve shifting dB is the value of the reference curve at 500 Hz Single number value in dB Law 21 4 3 Mechanical equipment noise Normalised equipment noise level LeT Standard NF S 31 057 1 equipment noise level in dBA received noise level when the equipment is working 1 RT spectrum Reference RT value French standard Frequencies Computation Octaves or third octaves 1 received impact noise spectrum received noise level of test floor excited by a standardised tapping machine 1 RT spectrum Optionally 1 background noise spectrum Octaves or third octaves Per frequency band dB L Received impact noise raw impact noise level T RT reception room TO Reference RT value If background noise spectrum as an input there is an additional correction cf 3 Result per octave or third octave bands over the whole frequency of the input spectra quantities 1 standardised impact sound pressure level L nT spectrum Octaves or third octaves The L nT spectrum must contain the frequency bands ranging from100 to 3150 Hz in third octaves or 125 2000 Hz in octaves Computation is carried out taking into account the frequency bands ranging from 100 to 3150 Hz in third octaves and 125 2000 Hz in octaves The reference curve cf table 4 is shifted in steps of 1 dB towards the measured curve L nT spectrum until the sum of the unfavourable deviations is a
139. l 1 Overall A Hn EEE 90 Display acquired data with cursors values and references Location Room v Com Demo Measure Status bar state and information about the acquisition process The measurement configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon z Definition of the measurement identifier location and comment Start the acquisition process l Show hide information table Stop the acquisition in progress Validate current results and store them in a Overloads and threshold exceedance display mea r E o aaa The upper part shows overload LEDs instantaneous on the left max hold on the Cancel current results and start again right The lower part shows a threshold exceedance LED see paragraph 9 2 6 The following icons are displayed if averaging conditions are set at the acquisition parameters stage See paragraph 9 2 5 2 ee Store the current averaged spectra in a Reset LEDs indication by a simple click on it measurement session datafile wt OD Define gain and threshold parameters 2 0 Reset the current averaged spectra Perform an automatic gain adjustment Save results in a measurement session datafile autorange Display the time decay edition window to adjust generator option has been activated See RT spectrum values See chapter 10 paragraph 9 2 3 Start Stop the noise generator i
140. lay to leave Autorange of the T the room before acquisition See EPP eee eee EEE t START l 4 l l l l l l l l l generator l l l l l Wait delay Autorange Generator lt Measurement eae CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 56 DBBATI32 SOFTWARE SUITE USER MANUAL Impulse signal See paragraph 9 2 5 Delay to leave the room Impulse signal bnk gun shot START Wait delay Measurement STATUS BAR See paragraph 9 2 5 L See paragraph 9 2 5 Emission of MLS sequence ACQUISITION Delay to leave the room Autorange er gore s START eee enn STATUS Wait delay Autorange lt Measurement BAR The states Wait dela y Autorange and Stabilisation of the generator are optional CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 57 DBBATI32 SOFTWARE SUITE USER MANUAL 10 DECAY EDITION WINDOW RT The time decay edition window is used to display the time decays that are used to compute a reverberation time spectrum This window is displayed at the end of the RT measurement or EzmmEzm analysis process see chapters 9 and 17 y EE It is also possible to modify time decays linked to an existing RT spectrum of the measurement session When editing a time decay item it is not possible to close the measurement session
141. like this Analysis Demo gza E A LU Refer to chapter 6 for more information on how to use the managers in Configure Parametize Reverberatio dBBATI32 All the display and analysis parameters can be saved in an analysis manager file GSA by using the command Analysis Save As CHAPTER 17 REVERBERATION TIME RT ANALYSIS PAGE 117 DBBATI32 SOFTWARE SUITE USER MANUAL 17 1 Analysis window overview rt EA Use the icon meN Reverberation time of the analysis manager to start the RT analysis window Display parameters toolbar curves to display time history etc amp G Analysis Reverberation time Demo gsa audio Tr_ CMG J lolx i tw a Command toolbar Channel 1 RT analysis parameters start stop analysis etc Location Test gt Channel 1 om Computation 100 Display analysis data with Status bar state and information cursors values about the analysis process The analysis configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon is Display the time decay edition window for RT i SQW ile inionmation tanie H spectrum calculation See chapter 10 Staran The following icons are displayed if averaging conditions are set Y at the analysis parameters stage See paragraph 17 2 3 D Store the current averaged spectra in a Stop the analysis in progress l i measurement session datafile Validate cur
142. line calculations using icons The operations that can be performed off line to items of a measurement session can now be accessed directly using the icons of the measurement session toolbar avoiding the use of the computation server for these simple calculations hese hed The icons shown aside can be used when compatible items of a measurement session are WEE selected These icons allows the operator to perform the following operations Addition of items Subtraction of items Averaging of items Frequency recombination in octave bands RT computation from a time decay item Refer to paragraph 15 2 8 for further information E Simplified and Standard user levels In standard mode all the functions of the software package may be accessed It is possible to access to the simplified version of the software by using a command of the Preferences menu This version offers a simplified user interface to the operator but some functions are not available Refer to chapter 20 for further information CHAPTER 2 NEW FEATURES PAGE 13 DBBATI32 SOFTWARE SUITE USER MANUAL LI Measurements Measurement of equipment noise Maximum value in Slow A The measurement of equipment noise for building acoustics applications correspond to the maximum value of the A weighted Leq time history using a Slow time constant over a user defined duration Refer to chapter 8 for further information Measurement using the MLS techn
143. lues and select channels 18 3 2 Status bar The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by selection in a list corresponding to the last 4 locations completed by the operators and the default locations Location Living room Com Demo Computation 100 Measurement Overall comment on of data acquired or processed location the measurement By default the location and the comment correspond to the audio data item being analysed CHAPTER 18 ROOM CRITERIA ANALYSIS PAGE 126 DBBATI32 SOFTWARE SUITE USER MANUAL 18 4 Selection of records to analyse fj audio T1 CMG Main window Select the audio records to analyse in a measurement F Allitems A sa 37 3 session data file ae Sa 8 E l aea glise D Pa Analyse one record gt Start the analysis process Audio Bureau ENEM 1 22050 Pa as Alpha Sabine Salle de sports ALPHA 614 see paragraph 18 5 Alpha Sabine Salle de sports ALPHA 814 E Equivalent ab Salle de sports ALPHA B14 Analyse several audio records gt Use the batch Equivalent ab Salle de sports ALPHA B14 command explained below Salle de sports 4 57 O01 INST 2 Eglise 629 001 To analyse several items successively and automatically use the batch gt oe lel Es mode an L amp a AA na Origin Status x i z audio Tr CMG To do z Use the command Datafile Batch to display the batch wi
144. measurement channel Perform an automatic autoscale to adjust data display at the end of the measurement PAGE 62 DBBATI32 SOFTWARE SUITE USER MANUAL 11 2 Measurement set up E P N Measurement set up can be done by pressing the key Parametrize of the manager The dialog box shown below appears on screen Heasurement set up Demo gsm Acquisition Criteria computation Options Selected items Channels Room criteria Room criteria Room criteria C Octaves Third octaves T Full octaves H Wi Room criteria Min 125 Signal i Impulse Measurement duration MLS ilies Y Refer to chapter 6 for more information on the use of managers 11 2 1 Acquisition channel types for room criteria measurement Channels lw 1 Room criteria zj Room criteria zj i Room criteria Room criteria zj T r r 11 2 2 Analysis parameters Choose between octave and third octa frequency limits for the analysis CHAPTER 11 ROOM CRITERIA MEASUREMENTS Define the active measurement channels the acquisition platform input lines that will be used for spectrum acquisition Note that only channels that have been enabled in the hardware configuration dialogue box may be selected see chapter 4 The type Room criteria is automatically associated to each channel all fields are greyed Frequencies Octaves Third octaves Min 700
145. measurements with great dynamic in presence of extraneous noise sources The MLS is therefore an efficient measurement technique in noisy environments that works without a powerful noise source and that allows to obtain results more accurate than traditional methods This technique is already implemented in various standard such as for evaluation of noise barriers CHAPTER 21 APPENDICES PAGE 137 DBBATI32 SOFTWARE SUITE USER MANUAL 21 3 Reverberation time calculation algorithm The reverberation time calculation is performed from the decay curves on each of the selected frequency bands These decay curves are generated at the time of frequency analysis of the recorded signal The reverberation time calculation is divided into the following steps Determination of signal emergence and significant sequence Terminology Reference band The reference band is the medium frequency band of the considered frequency range i e when using the standardised 125 Hz to 4 kHz octave bands the meaning channel is 500 Hz Study zone The study zone is the time section of the decay taken into account for the RT computation As default value the study zone is the complete duration of the original Signal file It may be changed in order to improve the result using the observation window S SMjw_ _ lt s amp lt lt lt _ 7 study Zone Meanng Channel LEVEL eee eee ee ee ee
146. mits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot fF 7 IY Show Display or not a grid I Constant range on the plot Show Hide cursors Min 30 0 values and select channels 17 3 2 Status bar The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by selection in a list corresponding to the last 4 locations completed by the operators and the default locations Location Living roorn Com Demo Computation 100 Measurement Overall comment on of data acquired or processed location the measurement By default the location and the comment correspond to the audio data item being analysed CHAPTER 17 REVERBERATION TIME RT ANALYSIS PAGE 120 DBBATI32 SOFTWARE SUITE USER MANUAL 17 4 Selection of records to analyse Select the audio records to analyse in a measurement session data file CMG3 Main window as response cE 18 17 56 mE gt Impulse response MLS 13 05 00 18 17 57 Test Example of measurement session that contains the three types of items compatible with RT analysis The following items may be used for RT analysis audio impulse response MLS impulse response From an impulsive signal source or MLS signal it is possible to apply integration Schr6eder and or suppress the background noise Analyse one audio record gt Start the analysis
147. mme stores the highest reached value and adjust the gain so that this value is located x dB margin defined in the dialogue box below that maximum measured value CHAPTER 14 MLS ACQUISITION MODE PAGE 78 DBBATI32 SOFTWARE SUITE USER MANUAL L Units Selection of the display unit of the input level The gain view meters may display the input levels according to three different units dB Phys Display the view meters in physical decibel This is a relative level in dB calculated according to the transducer sensitivity and the reference 0 dB of the transducer type dB ADC Display the view meters in converter decibel This is a relative level in dB The level 0 dB is defined as the full scale of the converter The values in dB ADC are always negative between 0 and 90 GB Unit Display of the view meters in physical units In case the transducer is a pressure microphone the view meter displays the values in Pascals Pa In case the transducer is an accelerometer the view meter displays the values in m s2 LJ Channels Define an identifier for each active measurement channel and if possible enable or disable the current measurement channel The gain adjustment scrolling bars allows the user to perform manual gain selection Click on the arrows to increase or decrease the gain value by steps of 1dB or unit Click on the scrolling bars to increase or decrease the gain value by steps of 10dB or units NOT ACTI
148. mmended that all spectra have the same response duration L Batch processing gt Todo 4 Mj x Group by E Tous les l ments D ate il IRA Date ospectre a sion U5 04 00 16 13 aks Autospectre Reception 05 04 00 16 13 26 Autospectre Ernission 0504 00 16 13 32 Bureau 1 3 1 Demo Autaspectre SEI 05 L 00 te 339 Bureau 13 1 Dermo Bo g Configure Farametrize 5 13 45 Bureau 13 1 Demo A 13 50 Saree 12 1 Demo The following icons of the batch window may be used To analyse several items successively and automatically obtain standard results use the batch mode z Use the command Datafile Batch to display the batch window shown aside Use the icon of the batch window to import the items selected in the measurement session datafile to the batch window oP of E Insulation Impact noite Mechanical Absorption Use these icons to select in which order the items will be analysed Remove the selected item from the batch analysis Use this icon to reset the batch analysis All items are in the state To do Remove all items from the batch analysis Processing for the selected item is Not Group by Allows to create groups of items For the above example active group items by 2 emission and reception for a batch processing of insulation criteria Start the computation process see paragraph 19 2 2 CHAPTER 19 STANDAR
149. ms 30 seconds 000j00h00m30s000 attack decay sustain release audio autospectrum clarity code coherence comment counter room criteria EDT transfer functions 1 H1 H1 1 H2 H2 histogram Nb cumulated histogram Nb Intensity active reactive free field cross spectrum sound insulation Leq measurement mean pressure psycho RASTI impulse response sensitivity Bark spectrum scalar spectrum STI TI TR Peak Fast Fast Inst Fast Max Fast Min Impulse Impuls Inst Impuls Max Impuls Min instantaneous Isel Leq Min RC RC Inst RC Max RC Min SEL Slow Slow Inst Slow Min Slow Max Tmax 3 Tmax 5 Bark dB Hz Order Scalar Acceleration counter displacement force jerk Noy pressure rate rate DC second scalar sone D F GD GF voltage velocity W m2 Manual input of a number Manual input of a location Max Min Average Stat 1 2 3 4 Manual input PAGE 99 CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG DBBATI32 SOFTWARE SUITE USER MANUAL Fields Description Value column column Fields column Base duration or integration time of Manual input 0 00000 seconds Period data items that vary with time ran 125 ms 0 12500 Frequency weighting applied to the data item during acquisition or off A B C D G Lin PL Pla PN Pink A Pink Lin Road A line analysis A B C Lin Road Lin TPN Wb WBc Wc Wd We Wf Wh Wj weightings
150. n Demo gsm Standard spectru Use this arrow to add f Emission z Fositioning khi Emissi measurement elements f Airbome noise reception level Vertical fi Airbome noise reg to the manager Background noise Horizontal H Impact noise reception level _V jad Background noise zA fan Double click on one Bet Mechanical equipement noice see element to modify the 7 i Reverberation time default name F Room criteria 7 Emi R ec simultaneously Cancel List of available Liste of selected elements elements Select one or several elements in the list on the left and use the arrow to add it to the list of selected elements on the right The list of selected elements will be shown in the manager toolbar Identical available elements can be added several times to the list of selected elements It is also possible to select the positioning of the manager toolbar and the order of the elements in the toolbar On validation the manager toolbar is updated CHAPTER 6 USE OF THE MANAGERS PAGE 29 DBBATI32 SOFTWARE SUITE USER MANUAL 6 3 Set up of a manager Use the icon an Parametrize of a given manager to access the dialog box containing all acquisition analysis and computation parameters The dialog box shown below allows one to set up the parameters of a given element of a manager and to define common parameters to all elements of the manager as well Use the tabs to access to all the paramet
151. n a sound level the threshold is passed a direction is specified Stage 5 Setting the display parameters Definition of the display parameters from the Display menu for optimisation the scale display of time histories etc The colours of the graphs may be edited using Preferences Colours Stage 6 Starting the measurement Acquisition is started using the command Acquisition Start F3 Icons found within the measurement window allow the start or ending of the measurement Passing the threshold could also start measurement Stage 7 Decay editing At the end of each measurement the user may edit the slope of the time decays in each frequency band and set up the arrival of the direct wave These settings have a non neglectable effect on the calculation of room criteria The decays edition window is automatically displayed on screen by default Stage n 8 Validation of the results and data storage At the end of each measurement the results can either be accepted or rejected For results that are accepted the spectra are stored in a measurement session datafile CMG Refer to chapter 11 and 12 for detailed explanations on room criteria measurements CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 20 DBBATI32 SOFTWARE SUITE USER MANUAL 3 2 7 Signal recording This command Acquisition record useful to record audio signals for later frequency analysis It can be used as a DAT recorder L
152. n spectrum DnT and corresponding single number value DnTw CHAPTER 19 STANDARD CALCULATIONS PAGE 129 DBBATI32 SOFTWARE SUITE USER MANUAL Each criterion selected requires input data items in a measurement session datafile The following tables give an overview of the criteria that can be computed the corresponding standard and the required data items for computation Refer to chapter 21 4 for detailed explanations of the computation of each standard criteria Input data items Standard Emitted Received RT Background noise noise spectrum noise spectrum spectrum spectrum few tevel difference D _ __ __ wesstosr ff ae MOOO a e _ e es ISO 140 4 COX a ee a ae a a i a ee Sound reduction index R ISO 140 3 NFEN 140 3 NFS 31 057 ee Spectrum Dn Spectrum Dn 1 Spectrum R NE EN 717 1 Spectrum R Spectrum DnT Input data items Standard Received RT Background impact noise spectrum noise spectrum spectrum Normalised impact sound pressure level LnT INF S31 057 X X Normalised impact sound pressure level Ln OX o o Normalised impact sound pressure level L n ISO 140 6 and e ee e o Standardised impact sound pressure level L nT ISO 140 7 Ee A ISO 717 2 Mechanical equipment noise Standard Input data items Normalised equipment noise level LeT NF S 31 057 Equipment noise level Leq RT spectrum Standard Input da
153. n the right hand side of the spectrum view Annuler Aide CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 91 DBBATI32 SOFTWARE SUITE USER MANUAL Graphics tab Display parameters setup anit Data Overall levels Graphics Line Mountain mode In this tab select the type of graphics that will be displayed line mode or bars mode Examples of the different types of graphical representation are given below Bars mode Line mode stairs Line mode mountain 15 4 Listings of data items tables Use the command by Datafile List after selection of one or more data items in the list in order to display data items as a table of results The user can also double click on the items of interest to display the table of results Broad band spectra may be displayed as tables in dBBATI32 Lists Octaves T A i s00 Y Min W A weighted overall level me p k Max M Unweighted overall level Al Select the minimum and maximum frequency bands for spectrum data values in the table of results If the All box is ticked the spectrum values are listed over the complete frequency range of acquisition Ei Listage CMG Listing Select the overall levels to compute according to a given frequency E weighting displayed in a list A and DAO de Campagnes FriListage CMG Lin levels ID 3 Autospectrum Type Recetved impact noise A axis resolut
154. ndow 2 3 audio TEMG Todo shown aside 3 4 audio Tr CMG To do Use the icon of the batch window to import the items selected in the measurement session datafile to the batch window Group by Fai The following icons of the batch window may be used Use these icons to select in which order the items will be analysed Remove the selected item from the batch analysis Use this icon to reset the batch analysis All items are in the state To do Remove all items from the batch analysis Processing for the selected item is Not Group by For spectral analysis of existing items this element must active be set to 1 because the analysis is done sequentially one item after another The main information bar of the analysis window shows ELELEE Spectrum Demo gsal Batch J the indication Batch as well as the number of items analysed and the total number of items to be analysed Start the analysis process see paragraph18 5 18 5 Analysis process After configuration the user can control the analysis process with the following icons Start the analysis F3 The analysis starts according to the defined analysis parameters If no record has been selected in the measurement session datafile this key is greyed Analysis is performed for Either a single record selected in the session datafile the main information bar of the analysis window indicate the name of the session datafile Either for a set of records
155. ng to the current calculation parameters Activate labelling of decay X axis in distances rather then time aE When enabled this option allows the user to select the start and end points of the regression calculations Enable or disable the decay manual adjustment mode Hide display of the results E h Activate manual adjustment of the beginning point of the cee NNE Hide display of the time histories B Undo the latest slope or direct wave adjustment Save the results in the active measurement session x okl x BF Mesure Crit res de salle Demo gsm D croissances Voie 1 Close the time decay edition window without saving Example Manual adjustment of the direct wave In this example the impulse response features 2 successive peaks dBBATI32 cannot therefore correctly apply the room criteria calculation algorithm Let consider that the first peak is a parasite noise Room criteria calculation must be applied to the second decay Use the function for adjusting the direct wave and move the cursor to the start of the second peak dBBATI32 then apply automatically the decay search algorithm and indicate by a different colour the new study zone The regression line used to compute the RT spectrum is also re calculated U Advice Use the linked cursors command to adjust the direct wave start for all frequency bands CHAPTER 12 DECAY EDITION WINDOW ROOM CRITERIA PAGE 72 DBBATI32 SOFTWARE S
156. nt averaged spectra in a measurement session datafile ERE E Do not accept current results and restart the analysis F6 i Save results in a measurement session datafile CHAPTER 16 SPECTRA ANALYSIS PAGE 115 DBBATI32 SOFTWARE SUITE USER MANUAL 17 REVERBERATION TIME RT ANALYSIS This chapter deals with RT spectra analysis off line analysis of audio records This mode allows the user to perform a batch analysis of existing audio signals stored in a measurement session datafile as acquired with dBBATI32 to obtain reverberation time spectra and time decays in octaves or third octaves The audio items to analyse are selected in a measurement session datafile To analyse several audio items successively and in an automatic manner use the batch command This chapter presents how to set up and perform RT spectra analysis Analysis Demo gsa a g Configure Parametrize Use the command Analysis New to open a new analysis manager This manager is used to select which analysis will be performed and to configure the analysis parameters of each one of them Analysis manager configuration Demo gsa EJEA e zere i Vertical ie Horizontal i Heverberation time Cancel Click on Configure to select which elements will be added to the manager ce Reverberation time Room criteria In this chapter we select the type of element Reverberation time The manager toolbar then looks
157. nually the minimum and maximum limits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot Display or not a grid Constant range on the plot Min 30 0 ms Show Hide cursors values and select channels 7 3 2 Status bar The status bar allows the operator to select the measurement locations and input a general comment either by direct input or by selection in a list corresponding to the last 4 locations completed by the operators and the default locations Location Kitchen x Com Demo Measure 35 Measurement Z Overall comment on of data acquired or processed lacation the measurement Identification Location It is possible to edit different locations for each measurement channels by using Channel Foom Ei the syntax Locationi Location2 in the edit zone For example the syntax Channel Office Room Office will affect the location Room to channel 1 and Office to channel 2 This operation may be done with the command al Commands z Identifier The dialog shown aside is displayed on screen Input the locations Dem for each active channels and a general comment i Cancel CHAPTER 7 SPECTRA MEASUREMENTS PAGE 38 DBBATI32 SOFTWARE SUITE USER MANUAL 7 4 Measurement process After measurement configuration the user can control the measurement process with the following icons Start the acquisition process F3 A The acquis
158. ocessed location the measurement By default the location and the comment correspond to the audio data item being analysed CHAPTER 16 SPECTRA ANALYSIS PAGE 114 DBBATI32 SOFTWARE SUITE USER MANUAL 16 4 Selection of audio records to analyse fj audio T1 CMG Main window Select the audio records to analyse in a measurement F Allitems gt gt A RE sa 37 3 session data file e Salle de s 8 E i aea glise D Pa Analyse one audio record gt Start the analysis Audio Bureau Px 1 22050 Pa Alpha Sabine Salle de sports ALPHA 614 process see paragraph 16 5 Alpha Sabine Salle de sports ALPHA S14 o Fauvalnt o Salle de oante ALPHAIB14 Analyse several audio records gt Use the batch Equivalent ab Salle de sports ALPHA B14 command explained below Salle de sports 4 57 O01 INST 2 Eglise 629 001 To analyse several audio records successively and automatically use the batch mode gt Todo 3 el ES I Use the command Datafile Batch to display the batch window 2 4 Lel al As shown aside fro ID Origin Status 1 2 audio Tr CMG Todo 2 3 audio Tr CMG Todo Use the icon of the batch window to import the audio 3 4 audio Tr CMG To do items selected in the measurement session datafile to the batch window The following icons of the batch window may be used Group by fi El ee ee eee Remove the selected item from the batch analysis items will be analysed Use this icon to rese
159. of bi Regular fio i E the Anal Alternative trl gq Cancel Anal Alternative Syrnbe Bold data to T Aral Black Bold Italic 11 display i Arial Narrow 12 Anal Rounded MT Bol 14 F Aurora BdCn BT H El The command Sample AaBbY yz Preferences Font allows the user to choose which computer Sent font will be used wesen H to display text in dBBATI32 Select the font type style regular Italic Bold etc and size in this dialog box Click on OK when all the modifications have been carried out 15 8 5 3 General functions The command Preferences Functions allows one to customise the software Functions P Small icons Tick this option to display small icons in the manager T Small icone toolbars T Compulsory locati Compulsory location Tick this option in order to oblige the user to input M Display and copy all measurement results a location for any next data item I Automatically display decays Display and copy all measurement results I Arange all windows automatically C Horizontal es Automatically display decays The decay edition window is displayed automatically after a measurement or an analysis of reverberation time or e room criteria Vertical CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 107 DBBATI32 SOFTWARE SUITE USER MANUAL Arrange all windows automatically all windows within the software will be arranged automatically in
160. ormation A complete description on how to assemble the various components of your system Is given in the getting started manual delivered with the system CHAPTER 1 DESCRIPTION OF A 01DB STELL PC BASED MEASUREMENT CHAIN PAGE 11 DBBATI32 SOFTWARE SUITE USER MANUAL 2 NEW FEATURES E Managers The user interface of dBBATI32 has been modified for a greater ease of use The managers allows the operator to configure and save the settings of the measurement system more easily and faster as well as performing successive measurements in batch mode Three different managers are available Measurement manager GSM Analysis manager GSA Standard calculation manager GSC All display acquisition and calculation parameters are saved with a given manager These managers therefore offer a simple and efficient mean to save Computation Demoa gse in a single file all the parameters of a measurement sequence For example a measurement file insulation GSM may contain all the acquisition parameters for emitted noise received Example of computation manager noise background noise and reverberation time measurements Configure Farametrize Insulation Impact noise Measure AHALA Refer to chapter 6 for further 4 8 l information on the use of these Configure Parametize E mission Airborne nols Background Rewerberatio managers Example of measurement manager L Quick access to off
161. ould be apparent Alternatively the design of an optimum PC based measurement system will depend on the management of data handling between the dedicated hardware and the PC environment The possibility of flexible and creative solutions that offer a very high degree of accuracy over a wide range of applications have been sought and developed over the last ten years by the team at 01dB CHAPTER 1 DESCRIPTION OF A 01DB STELL PC BASED MEASUREMENT CHAIN PAGE 9 DBBATI32 SOFTWARE SUITE USER MANUAL 1 2 General description 01dB have developed a modular PC based measurement chain similar to that used by traditional stand alone measurement systems This generic approach applies to sound level meters tape recorders or multi channel analysers The principle features are A transducer that transforms a physical quantity into an electrical input signal A Signal conditioner amplifies and conditions the electrical signal for treatment in an acquisition unit Conditioning units require power supply An acquisition platform or digital signal processing unit DSP with some dedicated DSP function performing the actual measurements To control the instrument a visual display panel is necessary In addition the results spectra time histories etc require a graphical interface Dedicated calculation functions such as the calculation of building acoustics criteria may be performed on the input signals The results which may take the form of
162. pgrade your version with optional modules contact your 01dB agent TABLE OF CONTENTS PAGE 5 DBBATI32 SOFTWARE SUITE USER MANUAL 9 REVERBERATION TIME RT MEASUREMENTS 9 1 MEASUREMENT WINDOW OVERVIEW D2 MEASUREMENT SET UP 9 2 1 Acquisition channel types for RT measurement 92 2 Analysis parameters 9 2 3 Signal characteristics 9 2 4 RT computation parameters 0 7 5 Measurement options 920i Acquisition options D232 Averaging options 9 2 6 Gain and threshold command autorange 9 3 DISPLAY SET UP AND STATUS BAR 9 3 1 Dynamic settings 9 3 2 Status bar 9 4 MEASUREMENT PROCESS 9 4 1 Procedure 9 4 2 Sketches 10 DECAY EDITION WINDOW RT 11 ROOM CRITERIA MEASUREMENTS 11 1 MEASUREMENT WINDOW OVERVIEW 11 2 MEASUREMENT SET UP 11 2 1 Acquisition channel types for room criteria measurement 11 2 2 Analysis parameters AED 3 Signal characteristics 11 2 4 Criteria computation parameters ADD Measurement options 11 2 6 Gain and threshold command autorange 11 3 DISPLAY SET UP AND STATUS BAR 11 3 1 Dynamic settings 11 3 2 Status bar 11 4 MEASUREMENT PROCESS 11 4 1 Procedure 11 4 2 Sketches 12 DECAY EDITION WINDOW ROOM CRITERIA 13 SIGNAL ACQUISITION 13 1 RECORDING COMMAND 13 2 GAIN AND THRESHOLD COMMAND 13 3 RECORD CONFIGURATION COMMAND 14 MLS ACQUISITION MODE 14 1 SET UP AND MEASUREMENT 14 2 GAIN SETTINGS 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG VS CMG
163. process Hide display of the RT spectrum Relaunch an automatic RT spectrum calculation according H to the current RT calculation parameters Hide display of the time histories Enable or disable the decay manual adjustment mode When enabled this option allows the user to select the start and end points of the regression calculations Simply J Save the results in the active measurement session select these points with the cursors on the adequate decay plot B Undo the latest slope adjustment gt lt Close the time decay edition window without saving CHAPTER 10 DECAY EDITION WINDOW RT PAGE 59 DBBATI32 SOFTWARE SUITE USER MANUAL 11 ROOM CRITERIA MEASUREMENTS dBBATI32 allows the user to compute the following room criteria Quality criteria RT EDT Clarity Definition ST1 Intelligibility criteria STI RASTI These criteria are obtained from echogram curves per frequency bands These curves result from an analysis by digital filtering from an impulse response of the room This response may be obtained by MLS technique Refer to chapter 21 5 for detailed explanations on the calculations criteria definition and results interpretation This chapter deals the measurement set up and process of room criteria in dBBATI32 Measure Dermo gsm sy Configure Parametrize Use the command Acquisition New to pen a new measurement manager This manager is used to select which measu
164. process see paragraph 17 5 Analyse several audio records gt Use the batch command explained below To analyse several items successively and automatically use the batch mode gt Todo 3 Mhi Use the command Datafile Batch to display the batch window ela Lel ee PERM shown aside ro ID Origin Ss Staus 1 2 audio Tr CMG To do 2 3 audio Tr ChG To do Use the icon of the batch window to import the items 3 4 audio Tr CMG To do selected in the measurement session datafile to the batch window The following icons of the batch window may be used Group ty fi g Use these icons to select in which order the items will be analysed Remove the selected item from the batch analysis Use this icon to reset the batch analysis All items are in the state To do Remove all items from the batch analysis Processing for the selected item is Not Group by For spectral analysis of existing items this element must active be set to 1 because the analysis is done sequentially one item after another l The main information bar of the analysis window M Analysis Spectrum Demo gsa Batch shows the indication Batch as well as the number of items analysed and the total number of items to be analysed Start the analysis process see paragraph 17 5 CHAPTER 17 REVERBERATION TIME RT ANALYSIS PAGE 121 DBBATI32 SOFTWARE SUITE USER MANUAL 17 5 Analysis process After configuration the user can control th
165. quipement noise Tick the box Equipment noise spectrum storage to save the mean Slow spectrum along with the measurement results Selected items 171 autospectrum data item Equipment noise spectrum storage Automatic validation Automatic validation Tick the box Automatic validation for the results to be saved automatically in the measurement session datafile at the end of the acquisition CHAPTER 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT PAGE 42 DBBATI32 SOFTWARE SUITE USER MANUAL 8 2 Measurement window overview Once the measurement set up has been completed start the acquisition by pressing the icon Ea Mechanical equipment noise of the measurement manager toolbar The following measurement window appears on screen Display parameters toolbar curves to display autoscale time history etc s e Cha Measure Mechanical equipement noise Demo gsm AY a wE al vc e Channell Slow max dB A Command toolbar acquisition parameters gains threshold start stop measuring etc Channell Slow dB A Channel 2 Slow max dB A Channel 2 Slow dB A 0 5 Locati Elevator Com Demo Measure Channel 1 Slow A Channel 2 Slow iof x 0 008 Display Slow time history A weighted with cursors values and references A 41 ifs 25 Status bar state and information about the acquisition process The measurement configu
166. r 125 4000 Hz in octaves Computation Per frequency band Per frequency band Calculation for the frequency bands in the range 100 5000 Hz in third octaves or 125 D L1 L2 dB DnT D 10 ig T TO dB 4000 Hz in octaves L1 Emitted noise level T RT reception room j indice of the frequency band L2 Received noise level TO Reference RT value m 6 for octaves measurements 18 for third octaves measurements The lower limit of the T duration is Sj Level for the frequency band j of the If background noise spectrum as 0 4 s If the measured value is less reference emitted noise spectrum for which an input there is an additional than this limit T 0 4s for the the calculation is made pink noise or road correction cf 1 calculation traffic noise Cf Table 1 Cj A weighting value for the frequency band If background noise spectrum as j Cf Table 2 an input there is an additional DnTj Value of the standardised level correction cf 1 difference for the frequency band j A weighted overall level of the theoretical emitted noise spectrum m Sj Gj 10 XE 10lg 10 i J A weighted overall level of the theoretical received noise spectrum m Sj DnTj Cj 10 XR 101g 10 j l DnAT XE XR in dBA Cf background noise correction Cf background noise correction 1 1 Result per octave or third octave Result per octave or third octave bands over the whole frequency bands over the whole
167. r a Fast sound pressure level the p family would be Leq and the data type will be Fast Frequency weighting applied to the data item during acquisition or off line analysis A B C Lin weightings vibration weightings etc O Name Name of the analysis that created this data item It is the name of the operator for a off line analysis and the name of the acquired quantity for a real time measurement Date and time of the data item corresponding to the date of creation or modification ist channel Location defined during acquisition Channel 1 by default For cross spectra it corresponds to the location of location the first measurement channel Duration of the data item hour minutes seconds Base duration or integration time of data items that vary with time Physical unit or dB for the histograms of the Y axis X axis Resolution of the X axis in seconds for time histories of data items frequency resolution for spectrum data resolution items xais Unit of the X axis Hz seconds etc Channel s Number of the measurement channel on which the data item has been acquired Comments Comments of the data item from measurement set up or item modification For off line analysis this field indicates how this data item was computed ID of the original data item name and type of operators used to compute the result Average type Type of averaging method used to compute the data item average min max statistical
168. r acquisition not available in MLS mode Trigger selection Direct to start the measurement immediately after clicking on the start acquisition command or Threshold to start the acquisition with a threshold condition negative or positive defined on the right hand side The programme waits for the threshold when the measurement start command is activated Trigger delay in ms For threshold triggering it is possible to start the acquisition with a pre delay or a post delay in relation to threshold crossing Input this delay or use the arrows up down to increase reduce the value Operation Select a logical Boolean operator for the threshold trigger OR to activate the recording if one of the conditions is fulfilled and AND to activate the recording when all conditions are fulfilled E Channels Define an identifier for each active measurement channel and if possible enable or disable the current measurement channel Threshold condition indicator becomes and stay yellow when one or several threshold trigger conditions are fulfilled Click once on the indicator to reset it CHAPTER 7 SPECTRA MEASUREMENTS The gain adjustment scrolling bars allows the user to perform manual gain selection Click on the arrows to increase or decrease the gain value by steps of 1dB or unit Click on the scrolling bars to increase or decrease the gain value by steps of 10dB or units Enable Disable the threshol
169. r falling slope LJ Gains When the option Linked is active the gains on all active measurement channels are modified The gain setting of one active channel leads to identical modification on all active measurement channels The gains on the active channels are identical if the option Identical is activated Each setting of one channel is passed to all other active channels This option is only available if the option linked has been chosen ae E Autorange 00 Start automatic gain setting according to the input level on the hardware platform The autorange proceeds as follows during the duration defined in the dialogue box the programme stores the highest reached value and adjust the gain so that this value is located x dB margin defined in the dialogue box below that maximum measured value L Units Selection of the display unit of the input level The gain view meters may display the input levels according to three different units dB Phys Display the view meters in physical decibel This is a relative level in dB calculated according to the transducer sensitivity and the reference 0 dB of the transducer type dB ADC Display the view meters in converter decibel This is a relative level in dB The level O dB is defined as the full scale of the converter The values in dB ADC are always negative between 0 and 90 dB Unit Display of the view meters in physical units In case the transducer is a pressure microphone th
170. r measurement channels identical for each active CHa measurement channel A Gain view meters and Automatic gain setting Duration Margin dB autorange launch command ao A adjustment scrolling and associated parameters ar Fl Physical unit used to 3 Activation of a threshold display gain levels Units E ADC Trigger Selection of the acquisition trigger conditions no trigger use of a threshold condition logical operator Delay jo 5 me Threshold value Slope of the threshold trigger trigger active on a rising or falling slope L Gains When the option Linked is active the gains on all active measurement channels are modified The gain setting of one active channel leads to identical modification on all active measurement channels The gains on the active channels are identical if the option Identical is activated Each setting of one channel is passed to all other active channels This option is only available if the option linked has been chosen mal E Autorange pealE Start automatic gain setting according to the input level on the hardware platform The autorange proceeds as follows during the duration defined in the dialogue box the programme stores the highest reached value and adjust the gain so that this value is located x dB margin defined in the dialogue box below that maximum measured value L Units Selection of the display unit of the input level The gain view meters m
171. r spectrum acquisition Note that only channels that ma Emission j have been enabled in the hardware configuration dialogue box may be r 4 Emis id selected see chapter 4 The spectrum type of each channel is automatically defined as a function of the type of measurement However for the element Emi Rec simultaneously it is possible to choose the channels types Emission or Airborne noise reception level 7 2 2 Analysis parameters Frequencies C Octaves hin fioo Third octaves pee N EE nay ares Mas F k kaa Choose between octave and third octave spectrum analysis and define the frequency limits for the analysis CHAPTER 7 SPECTRA MEASUREMENTS PAGE 33 DBBATI32 SOFTWARE SUITE USER MANUAL 7 2 3 Signal characteristics L standard Signal Signal The duration of the measurement is defined in seconds Standard E T Noise generator parameters C MLS l B Ej A pink noise can be generated in order to carry out emitted E and or received noise spectra measurements I Pink noise generator It is necessary to connect an amplified loudspeaker Manual to the LEMO4 output socket of the SYMPHONIE or HARMONIE acquisition box Stabilization duration before acquisition jao T completed This generator may manually activated with an icon of the measurement window or the F11 function key It may also be automatically started and stopped by dBBATI32 To do so tick the option automa
172. ration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon i ad ba Automatic re scaling of the spectra and time history plots Enable or disable display of the time history plot and select the frequency band to monitor The equipment noise level becomes equal to the cursor value El Eti Enable or disable linked amplitude scales of plots for each active measurement channel Perform an automatic autoscale to adjust data display at the end of the measurement The measurement configuration and control is accessible via the vertical command toolbar In the following we describe the functions of each icon A Definition of the measurement identifier izi location and comment E l Show hide information table m Overloads and underloads display The upper part shows overload LEDs instantaneous on the left max hold on the Pam eo right The lower part shows underload LEDs wel U Define gain parameters CHAPTER 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT Start the acquisition process Reset all indicators and data values Stop the acquisition in progress Validate current results and store them in a measurement session datafile Cancel current results and start again PAGE 43 DBBATI32 SOFTWARE SUITE USER MANUAL 8 3 Display set up and status bar The horizontal toolbar can be used to set the graphical display parameters of the me
173. rement will be performed and to configure the acquisition parameters of each one of them Click on Configure to select which elements will be added to the manager In this chapter we select the type of elements room criteria Measurement manager configuration Demo gsm Standard spectrum WEF Room criteria Positioning a Ermission Vertical iV Airbome noise reception level o Yeasts A Impact nose reception level pad Background noise Mechanical equipement noise n Reverberation time 3 Room criteria AH Em AAec simultaneously Cancel The manager toolbar then looks like this Measure Dema gam a P F LL Refer to chapter 6 for more information on how to use the managers in a a dBBATI32 onfiqure Parametize Room criteria All the display and acquisition parameters can be saved in a measurement manager file GSM by using the command Acquisition Save As CHAPTER 11 ROOM CRITERIA MEASUREMENTS PAGE 61 DBBATI32 SOFTWARE SUITE USER MANUAL 11 1 Measurement window overview F The measurement window can be accessed by the icon Eer room criteria of the manager toolbar D Measure Room criteria Demo gsm alil wae le 9 Command toolbar acquisition parameters gains threshold start stop measuring decays etc 125 250 500 1k 2k Display parameters toolbar curves to display Channel 1 Overall A Display acquired data with cursors values and references Location
174. rent results and store them in a EE PEE E E A measurement session datafile yS R Cancel current results and start again mj Save results in a measurement session datafile The display type and the display parameters of the active curves are controlled using the horizontal toolbar are Automatic re scaling of the display tit Perform an automatic autoscale to adjust data i display at the end of the analysis H Enable or disable display of the time history plot and select the frequency band to monitor CHAPTER 17 REVERBERATION TIME RT ANALYSIS PAGE 118 DBBATI32 SOFTWARE SUITE USER MANUAL 17 2 Analysis set up Fe pon Analysis set up can be done by pressing the key Parametrize of the manager 17 2 1 Analysis parameters Use the analysis tab of the analysis set up dialog box Choose between octave and third octave spectrum analysis and define the frequency limits for the analysis Also define the time basis used in the computation of the reverberation time decay Greater accuracy is achieved with a smaller time basis though at the expense of calculation time 17 2 2 RT computation parameters Analysis set up Demo gsa Analysis FT computation Options Reverberation time Selected temz 1 1 Computation Start dB F r Dynamic dB fao E Strict IF impulse signal or MLS Remove background noise Analysis set up Demo_ gsa Analysis RT computation Options
175. requency frequency band band A 0 16 V 1 T2 1 T m no unit TR RT empty room i octave band i TR RT room with test specimen Qi1 Qiz Qiz Sound absorption indices a for the three third octave bands of the octave band i no unit The averaged value is computed to the second decimal and rounded by steps of 0 05 with a limitation of p 1 00 for the rounded averaged values greater than 1 00 Examples of rounded values 0 92 is rounded to 0 90 0 93 is rounded to 0 95 0 97 is rounded to 0 95 0 98 is rounded to 0 90 0 1 2 Computation of the weighted sound absorption index Ow A translation of the reference curve is performed Cf table 6 by steps of 0 05 towards the measured values until the sum of the unfavourable deviations is less than or equal to 0 10 An unfavourable deviation at a particular frequency occurs when the result of measurements is greater than the reference value Only the unfavourable deviations are taken into account is the value of the shifted reference curve at 500 Hz 3 Add shape indicators Each time a sound absorption index p exceeds the value of the reference by 0 25 or more one or several shape indicators are added between brackets to the w value If the absorption excess occurs at 250 Hz use the notation L If the absorption excess occurs at 500 or 1000 Hz use the notation M If the absorption excess occurs at 2000 or 4000 Hz use the notation H Limitations Th
176. requency bands ranging from 100 to 3150 Hz The reference curve cf table 3 is shifted in steps of 1 dB towards the measured curve R spectrum until the sum of the unfavourable deviations is as large as possible but no more than 32 0 dB 2 0 dB per frequency band 16 bands An unfavourable deviation at a particular frequency occurs when the result of measurements is greater than the reference value Only the unfavourable deviations are taken into account The max unfavourable deviation at any frequency should be recorded if it exceeds 8 0 dB After the progressive curve shifting dB is the value of the reference curve at 500 Hz Single number value in dB 1 emitted noise spectrum 1 received noise spectrum 1 RT spectrum Optionally 1 background noise spectrum V Volume of reception room m S Area of the test specimen equal to the test opening m2 Octaves or third octaves Equivalent absorption area A per frequency band A 0 16 V T m V Volume of reception room m T RT reception room Apparent sound reduction index per frequency band R L L 10 Ig S A dB L Emitted noise spectrum L Received noise spectrum S Test area If background noise spectrum as an input there is an additional correction Cf 3 Result per octave or third octave bands over the whole frequency of the input spectra quantities Weighted apparent sound r
177. s column The operation of the Op column forms the condition of the request Furthermore a tool bar allows the user to perform the following operations Insert a condition in the list at the current mouse il Peniove tne condition elected a neath location Move up the condition selected in the list Move down the condition selected in the list appears in appears in video inverse video inverse CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 97 DBBATI32 SOFTWARE SUITE USER MANUAL The definition order of the conditions is important indeed the boolean operator logic column of the last condition defined is applied to all the conditions that precede it For example for a set of conditions to verify simultaneously AND operator in between each condition on if the operator for the last condition is OR then the request will display data items that match all the conditions associated by the AND operator as well as the data items that match the last condition The example below illustrates the principle Family Audio Family 7 Audio AND Duration 0h01 mO0s000 AND Duration OhO1 mO00s000 AND Duration OhOOrn 20s000 OR Duration gt OhOOrn30s000 Data items of the Audio family and of duration greater Data items of the Audio family and of duration than 30 seconds will be displayed as well as data ranging from 30 seconds to 1 minute will be items whatever the family of duration less than 1 displ
178. s large as possible but no more than 32 0 dB 2 0 dB per frequency band 16 bands in third octaves and 10 0 dB 2 0 dB per frequency band 5 bands in octaves An unfavourable deviation at a particular frequency occurs when the result of measurements is greater than the reference value Only the unfavourable deviations are taken into account After the progressive curve shifting dB is the value of the reference curve at 500 Hz Single number value in dB Le input RT spectrum must contain at least the frequency bands 250Hz and 500 Hz Ler Le 10 Ig T To Le Raw equipment noise level T RT reception room To Reference RT value T is defined as the arithmetic average of the measured reverberation time in the frequency bands 250 and 500 Hz Single number value in dBA CHAPTER 21 APPENDICES PAGE 147 DBBATI32 SOFTWARE SUITE USER MANUAL 21 4 4 Absorption coefficient KYO Absorption coefficient as Weighted sound absorption index aw standard Standard ISO 354 NF EN 20354 ISO 11654 NF EN 11654 2 RT spectrum 1 Absorption coefficient spectrum as TR RT empty room TR RT room with test specimen peer n T oo S Surface of test specimen m2 Frequencies Third octaves Third octaves The os spectrum must contain the frequency bands ranging from 100 to 5000 Hz Computation Equivalent absorption area of test specimen per 1 Calculation of practical absorption indice per f
179. s set up of the frequency range for all elements Refer to the chapter dealing with measurement analysis and standard calculations for more explanations on the parameters to select for a given measurement CHAPTER 6 USE OF THE MANAGERS PAGE 30 DBBATI32 SOFTWARE SUITE USER MANUAL 7 SPECTRA MEASUREMENTS This chapter deals with spectra measurements such as the ones listed below Standard spectrum Emitted noise Received airborne noise Received impact noise Background noise Simultaneous emission and reception The characteristics of these types of measurements are very similar even if some functions cannot be accessed for particular cases for example the pink noise generator or the MLS acquisition mode This chapter presents in a general manner how to set up and perform spectra measurements Use the command Acquisition New to open a new measurement manager This __ MMisesstitllemalBleulsi manager is used to select which measurement will be performed and to configure the bre F4 acquisition parameters of each one of them Configure Parametrize Heasurement manager configuration Demo gsm Click on Configure to select which elements will be added to the manager Positioning Yertical 0 Horizontal Standard pectrum iV Airbome noise reception level i fl Airborne noise reception level E Impact nose reception level K Impact noise reception level jad Background noise
180. sion datafile and dBBATI32 will use the post processing mode M Autorange before each acquisition T Automatic validation Perform an autorange automatically before each measurement 7 RDelevae meaetierient Automatic validation of the results Useful when averaging over several Delay s 5 measurements Define a delay before starting a measurement so that the operator may leave the room during the measurement process Refer to paragraph 7 4 for more information on the measurement process 7 2 4 2 Averaging options Average M he caretiine Averaging between channels of the same type JS Sisrage of Spectra an each cane One spectrum result is given for the active measurement irrespective of the number of channels For example if two channels are recording emitted noise dBBATI32 calculates the Number of measurements 3 aj average emitted noise spectra over the two channels M Over several measurements Storage of intermediate spectra An option allows separate storage of each spectrum from each active channel Average over several measurements In this case dBBATI32 will calculate the average spectra over a sequence of measurements It is necessary to define the number of measurements that are being considered The storage of intermediate spectra is also possible It is possible to combine the two types of averaging methods CHAPTER 7 SPECTRA MEASUREMENTS PAGE 35 DBBATI32 SOFTWARE SUITE USER MANU
181. ssion datafile at the ASCII format into a TXT file A wide range of application software packages may open these files Windows notepad word processors spreadsheet processors database software etc The user can perform any operation on the formatted data to edit a measurement report or to perform further calculations Each field in the ASCII file is separated from the next one by a tabulation in order to easily import these files into a spreadsheet processor We give below an example of ASCII file containing data from a sound insulation spectrum Id 9 Identifier number of the measurement Ident Name ISOL_O Comment Origin dBOper32 These fields correspond to the fields of a 01dB measurement session CMG files The name of the operator that allowed the user to perform the calculations the comment associated to the item the origin of the computation Family Sound insulation Set of data items of the same family audio autospectra etc Data Type Leq Type of quantity allowing us to define more accurately the data item for a Fast sound pressure level the family would be Leq and the data type will be Fast Type Type of a given spectrum emitted noise received noise etc for building acoustics Begin 25 11 94 15 49 56 End 25 11 94 15 49 56 StudyBegin 25 11 94 15 49 56 StudyEnd 25 11 94 15 49 56 Start and end date and time of an item Start study zone date and time of the item Period 0 000e 00 Base duration or integr
182. t Comment Dema i Cancel 8 4 Measurement process After measurement configuration the user can control the measurement process with the following icons Start the acquisition process F3 The acquisition starts according to the defined acquisition parameters From this moment the maximum A weighted Slow Leq value is stored To reset the measurement press again on this key All indicators would be reset in this case Stop an acquisition in progress F4 The equipment noise measurement is stopped the maximum A weighted Slow Leq value since the last reset is displayed for validation Calculation of the equipment noise spectrum mean autospectrum for the selected frequency bands is stopped Accept current results F7 The measurement results are saved in a measurement session datafile HE Do not accept current results and restart the measurement F6 CHAPTER 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT PAGE 45 DBBATI32 SOFTWARE SUITE USER MANUAL 9 REVERBERATION TIME RT MEASUREMENTS This chapter deals with RT spectra measurements During a reverberation time measurement dBBATI32 creates time decay for each measurement frequency band and then applies a regression calculation algorithm in order to determine the reverberation time value in seconds i e we obtain a RT spectrum Refer to annex 21 3 for a detailed explanation of the RT calculation Measure Dermo gsm sy Configure Farame
183. t Hardware configuration E From the hardware peripheral tab define ey Open _Saveas _ 2 m The type of hardware platform Name m The active measurement channels m For each channel a couple transducer calibrator of Hardware peripheral Femote contral same type m The signal conditioning options of the selected hardware S v MPHONIE gt Se peripheral Configuration key Channels Minimum 7 Maximum 2 No Transducer Calibrator Act The hardware configuration defined here will be recalled Pressure S4dB automatically next time the program is used Transducer fanaa Disable The acquisition platforms transducers and calibrators are selected from hardware elements databases defined under the hardware configuration programme dBCONFIG32 M echometic faneducer are gt Access to tachometric transducers is only available in Cancel dBFA32 Hardware The hardware board configuration sets up the computer so that it will be able to record data generated by the specified board It sets the number of possible active channels The Configuration key gives access to signal conditioning options built in the hardware unit Active channels Among the possible channel s available on the acquisition unit define which channels will be active for both acquisition and calibration Transducer The transducer configuration loads the transfer function of the selected transducer and allows the conversion o
184. t the frequency bands ranging from 100 to 3150 Hz in third octaves and 125 2000 Hz in octaves The reference curve cf table 3 is shifted in steps of 1 dB towards the measured curve DnT spectrum until the sum of the unfavourable deviations is as large as possible but no more than 32 0 dB 2 0 dB per frequency band 16 bands in third octaves and 10 0 dB 2 0 dB per frequency band 5 bands in octaves An unfavourable deviation at a particular frequency occurs when the result of measurements is greater than the reference value Only the unfavourable deviations are taken into account The max unfavourable deviation at any frequency should be recorded if it exceeds 8 0 dB After the progressive curve shifting dB is the value of the reference curve at 500 Hz Single number value in dB D PAGE 145 DBBATI32 SOFTWARE SUITE USER MANUAL 21 4 2 Impact noise aE ril Aig g Normalised impact sound pressure level LnT A weighted normalised impact sound pressure level LnAT Inputs 1 received impact noise spectrum received noise 1 normalised impact sound pressure level LnT level of test floor excited by a standardised tapping machine 1 RT spectrum Optionally 1 background noise spectrum Reference RT value Frequencies Octaves or third octaves Octaves or third octaves The Lar spectrum must contain the frequency bands ranging from100 to 5000 Hz in third octaves and 125 4000 Hz in oc
185. t is possible to start the acquisition with a pre delay or a post delay in relation to threshold crossing Input this delay or use the arrows up down to increase reduce the value Operation Select a logical Boolean operator for the threshold trigger OR to activate the recording if one of the conditions is fulfilled and AND to activate the recording when all conditions are fulfilled E Channels Define an identifier for each active measurement channel and if possible enable or disable the current measurement channel The gain adjustment scrolling bars allows the user to perform manual gain selection Click on the arrows to increase or decrease the gain value by steps of 1dB or unit Click on the scrolling bars to increase or decrease the gain value by steps of 10dB or units Enable Disable the threshold condition Threshold condition for a given measurement channel indicator becomes and stay yellow when one or several threshold trigger conditions are fulfilled Click once on the indicator to reset it Threshold level Trigger way The threshold condition will be fulfilled when the input level passes above positive slope or passes below negative slope the threshold value CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 54 DBBATI32 SOFTWARE SUITE USER MANUAL 9 3 Display set up and status bar The horizontal toolbar can be used to set the graphical display parameters of the measurement win
186. t the batch analysis All tems are mthe state To do HE Remove all items from the batch analysis Group by For spectral analysis of existing audio items this element aS g Or ANe Selected Meni is Net must be set to 1 because the analysis is done sequentially one item after another The main information bar of the analysis window shows ELELEE Spectrum Demo gsal Batch J the indication Batch as well as the number of items analysed and the total number of items to be analysed Start the analysis process see paragraph 16 5 16 5 Analysis process After configuration the user can control the analysis process with the following icons Start the analysis F3 The analysis starts according to the defined analysis and averaging parameters If no audio record has been selected in the measurement session datafile this key is greyed Analysis is performed for Either a single audio record selected in the session datafile the main information bar of the analysis window indicate the name of the session datafile Either for a set of audio records defined in the batch window the main information bar of the analysis window indicates Batch Stop the analysis in progress F4 STOF Stop the analysis process in batch mode The following icons are displayed if averaging conditions are set Accept current results F7 see paragraph 16 2 2 The analysis results are saved in a measurement sse ae aes Ec Store the curre
187. ta item for an analysis In 92 00 dB Ok Annuler 15 2 6 5 Edition of items Type for building acoustics Modification of 20 24 45 Lizstage CHG Date Location Comment Calibration Study Type Informations Selection In the Type tab select the type of a given autospectrum or audio file for building acoustics calculations Signal type W Impulse M MLS Bulding acoustics type eee usa The spectra resulting from a measurement in ABBATI32 already have the correct type C Received airborne nois Background nois fF Impact poise Received impact noise 15 2 6 6 Edition of items Information Modification of 20 24 45 Listage CHG m DAC conversion value Date Location Comment Calibration Conversion value allowing us to pass directly from the digital Study Type Informations value measured on the acquisition card to the analogue value Selection expressed in Pascals This value depends on the sensitivity of the RI DAC values transducer and the gain used Pa B 104e 003 DAC 0 000e 000 Full scale levels 140 00 dE Example For the hardware platform Symphonie sampling is performed over 16 bit with values ranging from 32768 to 32768 Gain 0 00 For a digital value of 5000 the level in Pascals is 5000 DAC Thus 5000 3 432e 4 1 716 Pa Transducer Pressure Full scale level Maximum value in decibels that can be measured with the current Annuler DAC value For Symphonie
188. ta items Absorption coefficient as ISO 354 NF EN 20354 RT empty room RT room with test specimen Weighted sound absorption index ow ISO 11654 NF EN 11654 X compulsory NF French standard optional ISO international standard CHAPTER 19 STANDARD CALCULATIONS PAGE 130 DBBATI32 SOFTWARE SUITE USER MANUAL 19 2 Computation process 19 2 1 Selection of the data items E Simple calculations Select the required data items to start a standard calculations The icons of the computation manager are greyed until the adequate items have been selected in the measurement session datafile Example Computation Demo gc Fe F dF f H 5 CMG4 Main window Configure Parametize Insulation Impact nose Mechanical Absorption F Al items S A se 37 ID Family Type Date location Channel O Autospectrum a noise ui M2 00 eiie 1 Autospectrum ceived noise 2 Autospectrum Received impact noise Decay 3 5 a J 01 02 00 14 19 47 i 01 02 00 14 04 13 Demo 1 Autospectrum Background noise 01 02 00 14 04 21 Demo 1 01 02 00 14 19 47 Demo 1 Demo 1 When emission reception and RT spectra are selected the icon Insulation becomes active in the manager toolbar Warning For insulation calculations from spectra obtained using the MLS technique two conditions must be fulfilled All the spectra must have been obtained using the MLS technique It is reco
189. taves Computation Per frequency band Computation is carried out taking into account the frequency bands ranging from 100 to 5000 Hz in third octaves and 125 Lit L 10lg T T dB 4000 Hz in octaves L Received impact noise raw impact noise level j indice of the frequency band T RT reception room m 6 for octaves measurements TO Reference RT value 18 for third octaves measurements Cj A weighting value for the frequency band j Cf Table 2 The lower limit of the T duration is 0 4 s If the LnTj Value of the normalised impact sound pressure level for measured value is less than this limit T 0 4s for the the frequency band j calculation m If background noise spectrum as an input there is an Lar 10 Ic in dBA additional correction cf 1 a j l Cf background noise correction 1 Result per octave or third octave bands over the Single number value in dBA whole frequency of the input spectra quantities Normalised impact sound Weighted normalised impact sound Normalised impact sound IS standard pressure level Ln pressure level Ln w pressure level L n Standard ISO 140 6 ISO 717 2 ISO 140 7 1 received impact noise spectrum 1 Normalised impact sound pressure level Ln 1 received impact noise spectrum received noise level of test floor spectrum received noise level of test floor Lia excited by a standardised tapping excited by a standardised tapping machine machine 1 RT spectrum 1 RT spectrum
190. ter hard disk in a measurement session datafile CMG as an impulse response item 14 2 Gain settings This dialog box enables the definition of gain and threshold settings These parameters can be used in several ways by the application software All parameters and the available actions may be enabled or disabled according to the acquisition module which calls this command Identification of active measurement channels The gains linked and or identical for each active measurement channel Gains T Linked T Identical Autorange Gain view meters and gain adjustment scrolling bar Automatic gain setting Duration _ Margin dE autorange launch command and associated parameters Fl Physical unit used to display gain levels Unie dE ADC f piect ihes Operation on Qd Gains When the option Linked is active the gains on all active measurement channels are modified The gain setting of one active channel leads to identical modification on all active measurement channels The gains on the active channels are identical if the option Identical is activated Each setting of one channel is passed to all other active channels This option is only available if the option linked has been chosen lt i L Autorange 200 Start automatic gain setting according to the input level on the hardware platform The autorange proceeds as follows during the duration defined in the dialogue box the progra
191. that this value is located x dB margin defined in the dialogue box below that maximum measured value L Units Selection of the display unit of the input level The gain view meters may display the input levels according to three different units dB Phys Display the view meters in physical decibel This is a relative level in dB calculated according to the transducer sensitivity and the reference 0 dB of the transducer type dB ADC Display the view meters in converter decibel This is a relative level in dB The level 0 dB is defined as the full scale of the converter The values in dB ADC are always negative between 0 and 90 GB Unit Display of the view meters in physical units In case the transducer is a pressure microphone the view meter displays the values in Pascals Pa In case the transducer is an accelerometer the view meter displays the values in m s2 CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 53 DBBATI32 SOFTWARE SUITE USER MANUAL E Trigger Define here the trigger parameters used for acquisition not available in MLS mode Trigger selection Direct to start the measurement immediately after clicking on the start acquisition command or Threshold to start the acquisition with a threshold condition negative or positive defined on the right hand side The programme waits for the threshold when the measurement start command is activated Trigger delay in ms For threshold triggering i
192. the SYMPHONIE or Stabilization duration before acquisition jao completed Emission duration i 0 Z completed HARMONIE acquisition box to generate a pink noise This generator may manually activated with an icon of the measurement window or the F11 function key It may also be automatically started and stopped by dBBATI32 To do so tick the option automatic and define a stabilisation duration before staring the acquisition and the emission duration as a function of the percentage of the complete duration of the measurement Refer to paragraph 9 4 for detailed explanations on the generator state during a measurement E Impulse signal Signal Interrupt stationary Impulse Measurement duration dBBATI32 offers reverberation time calculations from an C MLS p impulse signal Pink noise generator The duration of the measurement is defined in seconds E Hania E Autonet Stabilisation duration betore aequretton dhn te P a l ee d It is recommended to start an acquisition with a e completed threshold trigger see paragraph 9 2 6 Emission guration f 0 completed Refer to paragraph 9 4 for detailed explanations on the measurement process CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 50 DBBATI32 SOFTWARE SUITE USER MANUAL L MLs Signal In MLS mode Maximum Length Sequence follow the recommendations below It is necessary to connect an amplified loudspeaker to the LEMO4 outp
193. tic and define a stabilisation duration before staring the acquisition as a function of the percentage of the complete duration of the measurement Refer to paragraph 7 4 for detailed explanations on the generator state during a measurement L MLs Signal In MLS mode Maximum Length Sequence follow the signal following recommendations C Standard Response duration _ 7 3 It is necessary to connect an amplified loudspeaker MLS to the LEMO4 output socket of the SYMPHONIE Humber of averages acquisition box Enk nose Generator T ere The response duration should be carefully selected as it fe Antone Measurement duration should be adapted to the geometry of the room e E Wl Make sure that the response duration is long enough in e completed T order to obtain a background noise at the end of the measurement It is possible to average this response in order to decrease the effect of background noise The higher the average number the better the response quality because the influence of random phenomena background noise decreases On the other hand the acquisition duration increases the signal to noise ratio increase by 3 dB when doubling the number of averages Refer to annex 21 2 L General remark SYMPHONIE The output level of the signal can be set by the SYMPHONIE icon mia LAU SSIS x driver from the Windows task bar RECEP OUEN IGT level W Transmission l M Analog part Click on the icon BA Symphonie
194. tion Note that only channels that eee R have been enabled in the hardware configuration dialogue box may be leverberation time selected see chapter 4 Reverberation time X The type Reverberation time is automatically associated to each channel all fields are greyed 9 2 2 Analysis parameters Frequencies C Octaves Min fioo f Third octaves EINER ore ten nee Mas P k Choose between octave and third octave spectrum analysis and define the frequency limits for the analysis Also define the time basis used in the computation of the Time step of decays ms 20 reverberation time decay Greater accuracy is achieved with a smaller time basis though at the expense of calculation time The RT measurement is performed in real time only if the selected time step is multiple of 20 ms CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 49 DBBATI32 SOFTWARE SUITE USER MANUAL 9 2 3 Signal characteristics Select of signal that will be used for the reverberation time measurement E Interrupted stationary signal Signal dBBATI32 offers reverberation time calculations from a Interrupt stationary stationary signal cut off of a pink noise source Impulse Measurement duration F z The duration of the measurement is defined in seconds C MLS 4 M Pe eR AEE el Noise generator parameters enue It is necessary to connect an amplified loudspeaker Automatic to the LEMO4 output socket of
195. to ELSE AU USE AONE UV HSER SOE GEES be modified click on the key Licence number The following dialog box appears on screen ef MIV technologies group technologies group Edition of the license number x Application Enter the new licence number provided by 01dB technical support POOR OOK Start again the application software in order to account for this modification cares 21 2 MLS technique TO measure an impulse response most of use an impulse excitation such as a gun shot with blank bullets This method however is limited non linearity insufficient dynamic not repeatable etc It is the reason why an excitation with a stationary signal is preferred as it offers a greater precision of the result however the measurement process and computation load could only be carried out on large computers with great computational power The MLS technique Maximum Length Sequence allows us to perform impulse response measurements that once there are been filtered by frequency band will give access to reverberation times and spectra such as emitted and received noise spectra The Hadarmard transform mathematical operation is a great tool that can be used to obtain an impulse response from a stationary excitation in a simple and fast manner The emission of a white noise binary pseudo random sequence of maximum length and the simultaneous measurement in a given point of a room will allow us to perform accurate frequency
196. tor are optional L 3 Pink noise emission oe eet CEEETEETTETTECEEETTELEELEETEELEELEECETELTEL n l 2 oF i ACQUISITION TE l a 17 Stabilisation Delay to leave Autorange ofthe the room la sz generator In e before TELETELEETETETEI f acquisition t l l START l i l l l l STATUS BAR Wait delay Autorange Generator gt lt Measurement o eo 6 O See paragraph 7 2 4 1 See paragraph 7 2 3 CHAPTER 7 SPECTRA MEASUREMENTS PAGE 39 DBBATI32 SOFTWARE SUITE USER MANUAL 8 MECHANICAL EQUIPMENT NOISE MEASUREMENT The measurement of equipment noise for building acoustics applications correspond to the maximum value of the A weighted Leq time history using a Slow time constant over a user defined duration Audio signal recording and internal signal generator options are not available in this mode Measure Dermo gsm a g Configure Parametrize Use the command Acquisition New to pen a new measurement manager This manager is used to select which measurement will be performed and to configure the acquisition parameters of each one of them Click on Configure to select which elements will be added to the manager Select only Mechanical equipment noise Measurement manager configuration Demo gsm x The manager toolbar then looks like this Standard spectrurn Measure Demo gem i F Configure Param
197. torage of decays Automatic validation Refer to paragraph 18 5 for more information on the analysis process CHAPTER 18 ROOM CRITERIA ANALYSIS PAGE 125 DBBATI32 SOFTWARE SUITE USER MANUAL 18 3 Display set up and status bar 18 3 1 Dynamic settings The horizontal toolbar can be used to set the graphical display parameters of the analysis window H Use the command Display Autoscale to automatically re scale the plots as a function of the computed noise levels HI Use the command Display Automatic autoscale at the end of acquisition to automatically re scale the plots at the end of the analysis process Time history x Use the command te Display Time history to display the time history plot and select the frequency band to monitor The following Show tine facta abd ere ome tee Tick the box Show time history and select the frequency band Frequency A _Cancel_ or overall level to display Use the command Display Set up to define the display parameters of each type of data spectra and time histories in the measurement window The following dialog box is displayed on screen Display or not the Y axis scale and select the graph dynamic range constant range or set up manually the minimum and maximum limits Display or not X axis Spectrum Time history scale Show Hide one or two cursors on the plot fF 7 IY Show Display or not a grid I Constant range on the plot Show Hide cursors Min 30 0 va
198. trize Use the command Acquisition New to pen a new measurement manager This manager is used to select which measurement will be performed and to configure the acquisition parameters of each one of them Click on Configure to select which elements will be added to the manager In this chapter we select the type of element Reverberation time Heasurement manager configuration Demo gsm Standard spectrurn The manager toolbar then looks like j H Airbome noise reception level this E Impact noise reception level had Background nose Measure Demo gam H K Configure Farametrize Aeverberatio Mechanical equipement noize ue Reverberation time 3 Room criteria Emi Rec simultaneously Cancel Refer to chapter 6 for more information on how to use the managers in dBBATI32 All the display and acquisition parameters can be saved in a measurement manager file GSM by using the command Acquisition Save As CHAPTER 9 REVERBERATION TIME RT MEASUREMENTS PAGE 47 DBBATI32 SOFTWARE SUITE USER MANUAL 9 1 Measurement window overview raft Ena The measurement window can be accessed from the icon mel Reverberation time of the manager toolbar Display parameters toolbar curves to display autoscale etc amp G Measure Reverberation time Demo gsm 2 2 Command toolbar acquisition parameters averaging parameters gains threshold start stop measuring etc Channe
199. trum view Octave third octave 1 Nth octave band spectra Reverberation time in octaves and third octaves Let now describe each view in the following paragraphs 15 3 1 Signal view In this type of graphical view any time history of a signal in physical units noise and vibration quantity level in dB or in physical units can be displayed An example of signal view is given below Select the channel units to display zoom functions etc Define the 2 Signal plot Cmg Exemple CMG Torx study zone and ioe fra gt OO IQ S detax 639 944 ms the threshold Envelop ID 67 Ch 1 Pas ME E E E search a far N O R Toa Display the item over its functions o E TET RR A E 4 complete duration Zoom an given part of i ai ee SON SN R TAN EN S SaR PETN TR Ea the signal The toolbar of this graphical view allows the user to perform the following operations Ch 1 Select the active channel for the view End of the study zone Select the display unit W Define the study zone in between the cursors Activate Deactivate automatic autoscale for the Define the study zone over the complete duration of zoom the item Show Hide a channel and activate deactivate a channel for any subsequent study 7 Activate the zoom view Search for a threshold exceedance Perform an autoscale in the signal zoom view Deactivate the zoom view Stop threshold search BEE i Beginning of the
200. ty The STI is an indicator that takes into account all the possible causes of speech intelligibility alterations excepted the non linear effect STI formula Let first recall that any alteration of the signal modulation may be expressed at a signal to noise ratio We start with the acquisition of a M T F Modulation Transfer Function for the octave bands ranging from 125Hz to 8kHz covering the whole frequency range of speech phones Any modification of the room characteristics result into an effective reduction of the signal modulation with a delay The M T F may be obtained from the impulse response of the room h t by calculation of the modulation index m F for low frequencies F contained in the speech modulation rene a m F h t dt The numerator is the squared Fourier transform of the impulse response Ispeech and Inoise are the respective sound intensities of speech and noise Iparole Iparole Ibruit Let compute signal to noise ratio per frequency bands such as SINAF I log A We then calculate the mean S N after limitations of the S NK F to 15 dB S IN Y S N gt KF n being the modulation frequency number Let now calculate Transmission indices for speech per frequency band mr S N l5 T 30 The STI is the weighted sum of the TIk X TK ST X Wk k CHAPTER 21 APPENDICES PAGE 154 DBBATI32 SOFTWARE SUITE USER MANUAL Use of the STI index The STI allows us to
201. uration System calibration lt lt Se SS jo SS SS SS Spee Se SSS N l Room Emitted Received air e e e e e e l o e a a a a a a eee eee eee i E o oa en E a a a a a ae a a a o we we we we we we we we we we we we we we we we we we we we we we we we we we we we we we ws ws ee ee Spectra audios if required MEASUREMENT IMPORTATION SESSION CMG AUDIO RECORDINGS Data storage all types Dee ANALYSIS Edition amp execution of requests STANDARD CALCULATIONS OFF LINE OPERATIONS Insulation impact noise Recombination arithmetic operations equipment noise absorption etc All data acquired as well as any analysis result are saved in a database called a measurement session datafile of extension CMG The procedures for each type of measurement as well as each data processing operation are presented in the following paragraphs The stages common to each type of measurement are also described Each procedure is then described in details in the different chapters of this manual CHAPTER 3 ACQUISITION ANALYSIS AND COMPUTATION WITH DBBATI32 PAGE 15 DBBATI32 SOFTWARE SUITE USER MANUAL 3 2 Measuring with dBBATI32 3 2 1 Common steps These steps have to be taken before each measurement There are common to all the types of measurement L Stage 1 Set up of the measurement chain Connection of the hardware elements definition of their characteristics in the data
202. uration before jo completed Automatic validation Eiee A ratne 27 a Boats E E Pe al nth adai iia E fe 4 completes Dey 5 a Cancel Impulse and standard signal The measurement duration is defined in seconds V Automatic autorange before acquisitior MLS signal The response duration should be carefully selected as it should be adapted to the geometry of the room Make sure that the response duration is long enough in order to obtain a Response background noise at the end of the measurement duration 53 us It is possible to average this response in order to decrease the effect of umber at ie background noise The higher the average number the better the response 7 quality because the influence of random phenomena background noise M Os decreases On the other hand the acquisition duration increases the signal to Order 15 noise ratio increase by 3 dB when doubling the number of averages j Refer to annex 21 2 for more details on the MLS acquisition General remark SYMPHONIE The output level of the signal can be set by the SYMPHONIE icon WAf iimsik ake 0UE Sy driver from the Windows task bar D W Transmission M Analog part Click on the icon BA Symphonie 00066 with the right of the W Icon in topmost mouse A contextual menu appears Choose the Configuration field and set the SYMPHONIE output level The output level is changed in real time if you are playing a noise Output level
203. urement parameters Define the following parameters The acquisition frequency range Choose the frequency range for the acquisition This range defines the sampling frequency of the signal file The relation between the sampling frequency and the pass band is defined by the Shannon theorem The list of available frequency ranges depends on the hardware platform Symphonie Harmonie 20 000 Hz 10 000 Hz 5 000 Hz 2 500 Hz 1 250 Hz 625 Hz 300 Hz 150 Hz 80 Hz 40 Hz Jazz 20000 Hz 10 000 Hz 5 000 Hz 1 000 Hz 500 Hz 100 Hz 50 Hz The maximum record duration Define the duration for audio recording Use the arrows up down to increase reduce the duration of audio recording or input directly the recording duration via keyboard The maximum recording duration depends on the available hard disk space and the chosen pass band CHAPTER 13 SIGNAL ACQUISITION PAGE 73 DBBATI32 SOFTWARE SUITE USER MANUAL E Stage 3 Threshold and gain settings a M Autorange see paragraph 13 2 Select the icon of manual or automatic gain setting autorange These commands are useful to set up the measurement dynamic range in order to avoid overloads and underloads during recording The autorange is useful if the sound level does not vary greatly over the recording duration The thresholds allow to start a measurement automatically if a sound level passes under or over the defined threshold The user can check with the overload indic
204. urves per frequency bands These curves result from an analysis by digital filtering from an impulse response of the room This response may be obtained by MLS technique dBBATI32 allows the user to compute the following room criteria Quality criteria TR EDT Clarity Definition ST1 Intelligibility criteria STI RASTI These criteria are obtained from echogram curves per frequency bands These curves result from an analysis by digital filtering from an impulse response of the room This response may be obtained by MLS technique Refer to chapter 21 5 for detailed explanations on the calculations criteria definition and results interpretation The audio items to analyse are selected in a measurement session datafile To analyse several audio items successively and in an automatic manner use the batch command This chapter presents in a general manner how to set up and perform room criteria analysis Analysis Demo gsa a g Configure Parametrize Use the command Analysis New to open a new analysis manager This manager is used to select which analysis will be performed and to configure the analysis parameters of each one of them Analysis manager configuration Demo gza ee Pe manni Click on Configure to select which Reverberation time Vertical t ill b dded to th 3 Floom criteria pais elements will be added to the manager In this chapter we select the type of element Room criteria Canc
205. ut socket of the SYMPHONIE or HARMONIE acquisition box signal The response duration should be carefully selected as it Interrupt stationary should be adapted to the geometry of the room Response duration i i C Impulse bes z Make sure that the response duration is long enough in MS cak order to obtain a background noise at the end of the a Number of averages measurement Pink mose generator Manual E Automatic Stabilization duration belo acquisition 40 fs completed Emission guration f D completed 16 ha It is possible to average this response in order to decrease Measurement duration the effect of background noise The higher the average au number the better the response quality because the Order influence of random phenomena background noise decreases On the other hand the acquisition duration increases the signal to noise ratio increase by 3 dB when doubling the number of averages Refer to annex 21 2 for more details on the MLS acquisition Refer to paragraph 9 4 for detailed explanations on the measurement process L General remark SYMPHONIE The output level of the signal can be set by the SYMPHONIE icon iia LAU SSIS driver from the Windows task bar Pee M Transmission l i M Analog part Click on the icon BA Symphonie 00066 with the right of the J Icon in topmost Cancel Output level OdB 2 50 amp 10 dB 0 79 C 20 dB 0 25 C 30 dB
206. value per octaves dB Ci Frequency 1000 2000 4000 Equivalent sound absorption area m2 7 0 Table 6 Reference curve values for computing the weighted absorption index a ISO standard Frequency 250 500 1000 2000 4000 Value _ oso 100 100 100 090 CHAPTER 21 APPENDICES PAGE 150 DBBATI32 SOFTWARE SUITE USER MANUAL 21 5 Room criteria dBBATI32 allows the user to compute the following room criteria Quality criteria RT EDT Clarity Definition ST1 Intelligibility criteria STI RASTI This chapter present the definition of each index and a brief introduction to their meanings These criteria are obtained from echogram curves per frequency bands These curves result from an analysis by digital filtering from an impulse response of the room This response may be obtained by MLS technique For each criterion the computation principle is identical It may describe as follow For each frequency band octaves or third octaves Detection of the arrival of the direct wave and computation of the background noise level before the source Signal is emitted Detection of the end of signal emission and computation of the background noise level after source emission Calculation of the cumulated energy between the start and a given point of the echogram with or without background noise removal Calculation of the criterion with or without background noise removal by cumulating differ
207. vibration weightings Wk etc Building Type of a given spectrum emitted acoustics noise received noise etc for Background noise emitted noise received noise spectrum building acoustics EA Manual input 0 00000 Statistical index Ln ee ane L99 8 99 8000 X axis unit for a quantity acquired with other software not 01dB eae X axis unit for a quantity acquired with other software not 01dB For Y1 axis unit example the temperature For cross spectra Y1 corresponds to Manual input the physical unit of the first item and i Y2 corresponds to the physical unit Y2 axis unit of the second item used to calculate the cross spectrum Manual input 0 00000 Version 1 01 1 01000 Legend Less than Less than or equal to Not equal to Equal to Greater than Greater than or equal to Contain the character string V Il OVVIAAA CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES CMG PAGE 100 DBBATI32 SOFTWARE SUITE USER MANUAL 15 7 3 Execute a request Once all the requests have been defined use the scrolling list a E of the measurement session window or the command Datafile Current request The selected request is then executed automatically An example of execution of a request to display only items of the audio family is given below BET cmg Main ania of x FAID items gt l A set 0o78 ere Channel 2 30s to 1 min ib Suge W Name Dat All items date type da ate A
208. ways possible to edit manually within a particular test report Cancel Table of values The table of values featured in the test reports uses symbols and colours explained below The listed spectrum Fr quence F octave does not contain f Hz dE this particular value The listed spectrum contains a value that is not valid for this frequency band The values marked in red are used to compute the single number quantity Difference too small between received and background noise levels Save the test report Use the command Report Save or Rapport Save As to save the complete test report in a HTML file standard format for web browsers Open a test report on another computer The graphic display in the report uses a Java applet that is installed as standard with 01dB programs This applet must be present on the computer to display correctly the graphics of a report Proceed as follow to display a test report On the PC where dBBATI32 is installed copy the Com directory located in the directory where 01dB software applications have been installed Copy this directory on the PC at the exact same location on the hard disc where the test report is displayed Printing the report Use the command File Print to print the test report The user modifications fields in the test reports are taken into account before the print operation CHAPTER 15 MANAGEMENT OF MEASUREMENT SESSION DATAFILES C
209. ws the user to select a measurement session file CMG for processing in dBBATI32 by choosing the appropriate location on the hard disk The lower part of this dialog box is activated when a CMG file has been selected in the list Various information on the datafile are given such as E The date and time the file has been first recorded and when it was last saved the version and the number of items contained in the CMG file By ticking the details box the size in bytes of the datafile the start and end dates of the measurements the number of events audios spectrums etc as well as general parameters dynamic range number of codes etc Once a file has been selected click on the Open button to open the datafile and proceed with its analysis 15 1 3 Close a CMG datafile To close a measurement session file of type CMG use the command File Close Closing down the window of the datafile will also result in closing the CMG datafile All others windows results listings plots etc will be closed as well dBBATI32 will also prompt the user to save this CMG datafile if any modifications have been made to it before closing 15 1 4 Save a CMG datafile Use the command File Save CTRL S or File Save As to save the measurement session on the computer hard disk 15 1 5 Delete one or several CMG datafile s Use the command File Delete session s to delete one or several measurement session datafiles including temporary fil
210. ynamic range is lower than Y X In this case the RT value for the corresponding band is not calculated The figure below shows the principle of the RT value calculation LEVEL x dB Y dB The Reverberation time for the corresponding frequency band is calculated as being the slope of the linear regression between the RSP and REP In the case where the REP cannot be calculated below the SEP when using the strict option the RT is not calculated whereas when disabling it the RT is calculated between the RSP and the SEP Once the RT is calculated the program displays the correlation between the linear regression and the points of the decay curve The RT computation process is ended CHAPTER 21 APPENDICES PAGE 142 DBBATI32 SOFTWARE SUITE USER MANUAL 21 4 Standard calculations 21 4 1 Insulation French Raw level difference D Standardised level difference A weighted standardised level difference DnT DnAT with reference to Pink noise or Road traffic noise 1 emitted noise spectrum 1 emitted noise spectrum 1 Standardised level difference spectrum 1 received noise spectrum 1 received noise spectrum DnT 1 RT spectrum standard Optionally 1 background noise spectrum Optionally 1 background noise spectrum Frequencies Octaves or third octaves Octaves or third octaves Octaves or third octaves The DnT spectrum must comprise all frequency bands in the range 100 5000 Hz in third octaves o

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