User Manual
Contents
1. 2 2 2 18 4 1 5 Channel Destination Data 19 4 1 6 Sample Address Code 2 4 19 4 1 7 TIME GOOS a x a r rog ra ee ee BHR we asas 19 4 1 8 Reliability Flags a a aaa ee ee 19 4 1 9 Category Code oa a a a ee bee ed eee ee ee oe CO 4 2 INPUT MENU s s 6 be SER eH ee ee ew ew es owe CU DIGIspy USER MANUAL 4 2 1 Select 24 tee eh de ee Ree eee oe oe ew 20 4 2 2 Set Autoscan Feature 2 4 20 4 3 Error Men s r s 4 u xw w ee 4 3 1 Activate Error Logging 6 6 2 4 e es 21 4 3 2 Display Error Statistics s s e e e s s sna drra 2l 4 3 3 Display Error Details a a a a a a a a aaa 21 4 3 4 Set Error Rate Unit oaa aaa a a a a 22 4 3 5 Clear Error Log os io aaa a 2 4 4 Parameter Menu a aaa BD 4 4 1 HeddrOOM lt ss aa rowr i wee ee ea et drer Ed 4 4 2 Clipping Sensitivity a a a aa aaa 2 4 4 3 Silence Sensitivity a a a 4 4 4 4 Select Monitor Channel a aa a a a aaa 24 4 4 5 Set Power Off Timeout oaoa a a a aaa 24 4 4 6 Auto Power Off with external power 24 4 4 7 Set Backlight Timeout lt lt 4 4 8 ee a be ee CO 4 5 Setup Menu 2 22666 422 ee ee ee ew Y Bw amp BORO 4 5 1 Select Setup 1 ee ee ee ee 20 4 5 2 LOGO SELUD s sa sa we aoe d e See Be Gi ss CO 4 5 3 DOVE ICG lt s s s baw ewe eS2. 6 2 Notes on error weights Calculating the weight of each error from your specific quality requirements in volves the following steps e Define your exact quality requirements How many errors of which type do you tolerate for a given quality indication Define 13 combinations of individual n to result in a particular Q value e Write down the equation of section 5 4 2 13 times filling in the n and Q values e Solve this set of seven equations for the w values Calculating the individual weights is also available as a service from the manu facturer DiGispy USER MANUAL 7 Tips and Hints 7 1 Cleaning and Maintenance DIGlspy does not require neither calibration nor any special maintenance proce dure Always keep connectors clean and free from dirt or moisture especially the optical input connector Be sure to handle the accumulators with care to maximize their life If the case needs cleaning use a soft damp cloth If necessary add a mild de tergent to remove fingerprints from the display Never use any solvents be cause this will damage the plastics of the case The leather case needs some care to keep it soft and supple Use a special leather care product for this 7 2 Troubleshooting If the unit does not work properly consider the following table for troubleshoot ing hints If you cannot resolve the problem please consult your reseller Symptom Cause Action No input signal
3. Because of the amount of information pertaining to each error the Vectorscope Area is used to display the error details while the Menu Area displays the Error Number Thus the Vectorscope feature is disabled as long as this menu item is active USER MANUAL DIGIispy While retrieving error information from non volatile memory the level meter vectorscope and protocol analyzer displays are not updated The figure at the right shows example of an error detail display 1 Error Type P Real Time and Date of error generated by DIGlspy independently of the Time Code 3 Sample Address Code if available otherwise zero 4 Time Code if available otherwise zero Pressing the UP and DOWN keys scrolls through the individual errors Errors are sorted by time and date in ascending order If multiple errors occurred simultaneously one error record splits into several pages You may easily tell on which page you are on by looking at the page num ber that is displayed in brackets after the error number Simultaneous errors are sorted by severity in descending order e the most relevant error is al ways displayed on page number 1 4 3 4 Set Error Rate Unit To set the time unit on which the Error Rate CET Display is based use this menu item You may A select between one second one minute one hour or the total error count by pressing the UP and DOWN keys The total er ror count is selected if no other unit is display
4. DIGIspy USER MANUAL 4 Menus Menus serve for setting parameters and displaying advanced information Menus are displayed in the menu area To access a menu press the NEXT key until the menu area displays ENTER lt name gt MEW Then press the UP key Now press the NEXT key until the name of the parameter you wish to change is displayed Pressing the UP key cycles through the available parameter values and press ing the DOWN key cycles in the opposite direction The change takes place im mediately To leave the menu either cycle through the parameters using NEXT until LEAVE lt name gt MEW is displayed and press YES or escape directly from the menu us ing the POWER ESC key If you decide not to change a parameter set it back to the value that was cur rent before you entered the menu The unit remembers the menu that was used last If you press the NEXT key to enter the menu the most recently used menu is displayed 19 USER MANUAL DIGIspy The chart below illustrates the menu structure 16 DIGIspy USER MANUAL o CO w USER MANUAL DIGIispy 4 1 Information Menu The Information Menu shows decoded data from the channel status This menu is context sensitive I e it only contains those items that are relevant to the Current data format The UP and DOWN keys are not used in this menu 4 1 1 Sampling Frequency The sampling frequency of a data stream is accessible COT
5. To toggle Error Logging on and off press the UP or DOWN key while this menu item is dis LET Coo Da played The RECORDING indicator below the Er LIWNZIX ror Rate Display will show the current state 4 3 2 Display Error Statistics This menu item allows you to query the number of er morro Trae com rors of each type Upon entering the unit retrieves Lay Lats ON data from its non volatile memory This process takes a couple of seconds Then you may scroll L i x i through the different error types and their counts that have been recorded by pressing the UP and DOWN key When the display is about to wrap around to the first error type LOCK error the unit retrieves the data from its non volatile memory again in case it has changed since before Keep in mind that you need to either wrap around to the first er ror type or leave and re enter this menu item in order to update the display with new error information collected in the meantime 4 3 3 Display Error Details This menu item shows the complete information of mvo Dl Coe each error that has been recorded Error Type Real LICL Late LDN Time and Date when it occurred Address Code and reco r Time Code The latter two however need to be pro Li irs vided by the signal source Only Professional Mode AES EBU signals can contain Address Codes and Time Codes but these are not mandatory Consumer Mode SPDIF signals do not carry Address Codes or Time Codes
6. A numeric characters rrr 4 1 6 Sample Address Code In case of a AES EBU professional data stream OT the Sample Address Code is used to transmit the NU local time of the data source relative to an arbi trary reference time lt can be used to correlate i time between source and destination Transmitting a Sample Address Code is optional Use this menu item to display the Address Code in hexadecimal format If none is available the unit displays MONE The display is updated once every second 4 1 7 Time Code In case of a AES EBU Professional data stream the Time Code is used to transmit the running time of the data source relative to an arbitrary reference time It can be used to correlate time between source and destination Transmitting a Time Code is optional Use this menu item to display the Time Code in hexadecimal format If none is available the unit displays MONE The display is updated once every second 4 1 8 Reliability Flags The Reliability Flags which are mandatory to an ee AES EBU Professional data stream show which por RE tion of the channel status contains reliable data The T first flag refers to channel status bytes O to 5 the second to bytes 6 to 13 the third to bytes 14 to 17 and the fourth to bytes 18 to 21 A flag value of O signifies reliable data USER MANUAL DIGIspy 4 1 9 Category Code In case of a SPDIF Consumer data stream the Category Code identifies the
7. Clipping Headroom violation Muting Recognized Transmission Errors Error Logging 900 errors min Capacity gt 1000 errors typ with compression 39 5 Monitor Output Resolution 24 bit Output Power 75 mW per channel at 32 ohms THD TBD S N ratio TBD 39 6 Other Frequency measurement accuracy eat gai Frequency measurement 0 1 Hz resolution Real time clock accuracy 2 min month Operating temperature O to 40 C range 10 to 30 C while charging NiMH AA accumulators x 2 power supply charger Power supply car adapter dry cells Accumulator runtime 9 hours using 1600 mAh NiMH accumulators Dimensions and weight 83 x 152 x 34 mm 325 g incl accumulators DIGIspy USER MANUAL DIGlspy is a product of SCHMID electronic Badstrasse 39 72 66 Reutlingen Germany www schmid electronic de Phone 49 7121 14472 17 Fax 49 7121 14472 27 distributed by S E A Vertrieb amp Consulting GmbH Auf dem Diek 6 48488 Emsburen Germany www Sea vertrieb de Phone 49 5903 9388 0 Fax 49 5903 1463 SCHMID electronic 2000 2003 All Rights Reserved Specifications are subject to change DIGlspy is a registered trademark of SCHMID electronic Brand names used are trademarks or registered trademarks of their respective owners 3g USER MANUAL DIGIspy Declaration of CE Conformity We SCHMID elect
8. If you need to connect to a consumer format source with Cinch RCA connec tions use the included XLR Cinch adapter A number of additional adapters meeting various connection standards are offered as accessories Please see chapter 8 for a list of available adapters Always put the protective cap back in place if no cable is con nected to the optical input Be careful not to let the connector or the cap come in contact with dust dirt or moisture The XLR socket on the device does not have a latch mechanism in order to facili tate frequent connections and disconnections To disconnect the XLR jack just pull it straight out To connect an optical cable to the Toslink connector remove the protective cap by pulling it straight out Initially you may need some force to do this Then insert the cable s connector by pushing it straight in Make sure to respect the connector s orientation Forcing it in upside down will damage both the cable and DIGlspy s input module To disconnect the cable pull it straight out and put the cap back in place Be sure not to pull at the optical fibre itself You may make connections to both inputs at the same time If DIGlspy detects valid data streams on both inputs the XLR connector has priority over the Toslink Connector DIGlspy remains locked on to an input as long as a valid data stream is present there You may of course force DIGIspy to switch to the other input by means of the INPUT menu
9. L dBFS m ul W O e gl D O gl D R E OVER 8 ol O AAA PARANA m o DIGIspy USER MANUAL 2 1 5 Menu Area Above the vectorscope display there is the menu area In this area DiGlspy displays menus and advanced status information See section 4 for details If no menu is active the first line of the menu area shows the current time while the second line displays the type of the most recent transmission error if any Please see section 5 1 1 for an explanation of error designators To clear the Last Error display push the POWER key briefly If sampling frequency exceeds the allowed range DiGlspy shows 5F UNGERFLW or SF OVERFLL in the second menu line Immediately after power up he fret menu line shows the number of the current setup More information on setups can be found in chapter 4 5 2 1 6 Monitor Volume Indicator and Battery Gauge On the lower right edge of the display you Can see the current volume on the monitor headphone output If the loudspeaker sym SIMO Ly wy WIA bol beneath the volume scale is lit the out LA LP a a 1000 EJES put is active otherwise it is muted Next to this symbol there is an indicator on which channel s are is currently output ST means Stereo MO means Mono Sum out put to both monitor channels L and R mean Left Right channel of the input sig nal is output to both monitor channels respectiv
10. Parity Error Consumer Mode VALI C Validity Bit Set Consumer Mode CSDIF C Channel Status Difference Consumer Mode CLIPL C Clipping on Left Channel Consumer Mode CLIPR C Clipping on Right Channel Consumer Mode HEADL C Headroom violation on Left Channel Consumer Mode HEADR C Headroom violation on Right Channel Consumer Mode MUTEL C Muting on Left Channel Consumer Mode MUTER C Muting on Right Channel Consumer Mode USER MANUAL DIGIspy To understand how a specific weight influences signal quality indication consider the following formula Q 255 nw where Q signal quality i error type n number of errors of type per second weight of error type Q is calculated once per second The result is converted to a scale from O to 5 in the following way Q Indicator scale below 25 O between 25 and 75 1 between 75 and 125 2 between 125 and 1 75 3 between 175 and 2259 4 above 225 3 From the formula above you can see three things e The more errors occur the lower the quality indicator will be e The higher the weight of a specific error is set the more impact on the Signal quality it will have e If you want to mask a specific error set its weight to zero The following table shows the default weights Professional Mode LOCK P AMPL P CODE P PARI P CRC P VALI P CSDIF P 200 20 50 30 70 0 O CLIPL P CLIPR P HEADL P _
11. see section 4 1 The XLR input is protected against phantom power in case analogue microphone Signals are connected to it 10 DIGIspy USER MANUAL 2 3 Headphone Connector The headphone connector 1 on the right side of DIGlspy accommodates to headphones with an impedance of at least 32 ohms It is possible to connect other equipment like active loudspeakers to the headphone connec tor too However It is not recommended to use this output for evaluation of audio signal quality The headphone output has a channel comparison feature that allows you to compare the stereo signal to the mono sum or to mask one of the two chan nels See section 4 2 2 for details Please avoid connecting or disconnecting the headphone while the unit is pow ered on When powering on and off or changing digital input signals click and pop noise might be encountered at the headphone output 2 4 Power Connector To charge DIGlspy s accumulators or to run it from the mains power supply connect the AC adaptor included with the unit to the Power Connector 2 lo cated next to the Headphone connector You may also connect the DCA 75 Car Adaptor to the power connector of the unit in order to charge and or operate it from a car or truck battery Only use AC adaptors type ACA 751 for the U S or ACA 752 for Europe otherwise serious damage will result Do not tamper with the power connector to adapt it to a retail AC adaptor If the AC ad
12. summary showing the count of each error type and in a detailed report showing one record at a time sorted by date time Error details include Sample Address and Time Code whenever possible DIGIspy acts as follows e If this data was contained in the stream they will be shown as hexadecimal numbers e If this data was contained in the stream but they were obviously unreliable INVALID is shown e If this data was not transmitted at all 00000000 is displayed If there is a serious transmission error like LOCK AMPL or CRC the Sample Address and Time Code stored along with this error is unreliable To correlate the occurrence of such an error with the local time either use the Time Code or Address Code of one of the errors logged just before or use the real time logged with the serious error because this is generated by DIGIspy itself and is not dependent of the incoming data 5 1 2 Logging Details DIGIspy distinguishes between error records and information records An error record is generated whenever an error occurs An information record is gener ated whenever an error condition no longer exists e g the unit has re locked to another input signal To facilitate interpretation of the stored data additional information records are inserted when another input is selected either manually or by means of the Autoscan feature and when error logging is started and stopped Thus you may distinguish different loggin
13. to do so may result in battery explosion Should you inadvertently insert one or both accumulators with polarity reversed correct this immediately to avoid damage to the unit and the accumulator s 3 3 Basic Measurements Connect a digital audio source to one of the inputs Then press the POWER key until the display turns on Provided that the Autoscan feature has not been turned off see section 4 1 the unit scans all inputs until it recognizes a valid data stream As soon as a valid signal has been detected the display is updated with the sig nal s content and the monitor output is activated To adjust the monitor volume make sure that no menu is active the menu area shows the current time and the last transmission error Then press the UP key to increase the volume press the DOWN key to decrease it For now you need not walk though any of the menus because most of the information is dis played at once If you do not hit any key for 5 seconds the display backlight is switched off to reduce power consumption lt turns back on as soon as you hit any key To just turn on the backlight without triggering any other functions briefly hit the POWER key If you do not hit any key for another 30 seconds the unit powers off automatically You may customize these settings see section 4 4 To turn off the unit manually press and hold the POWER key until the display shows SGUuDBYE Then release the POWER key sc A
14. DIGIispy DIGITAL AUDIO TRANSMISSION ANALYZER Analyze of digital audio transmission lines Count and record Display cb E e Yu S a Y E ab p o o LS Om ice e e JE e amp o ge E e E Y ie ice nal Monitor User Manual Firmware B 3 07 SCHMID electronic digital audio engineering Solutions for Digital Signal Processing USER MANUAL DIGIispy Contents 1 Introduction as s 1 w we es 5 2 Display Controls and Connectors 6 2 1 Display gt 0 2 1 1 Signal Quality Display 6 2 1 2 Protocol Analyzer Display 7 2 1 3 Level Meter B 2 1 4 Vectorscope 8 2 1 5 Menu Area S ee Ree ee 93 2 1 6 Monitor Volume Indicator and Battery Gauge 8 ras a Input Connectors 10 2 3 Headphone Connector 11 2 4 Power Connector 11 2 0 Keys oa 12 2 6 Battery compartment 12 3 Making Measurements a n ar raran 13 3 1 Charging the accumulators 13 3 2 Power sources aoao ase a a a 6 a a ss eH ee 1 3 3 Basic Measurements a a 14 a Mienus s s s 8 ns 8 8 8 8 2 wp 2p 15 4 1 Information Menu 1 ee a ee 18 4 1 1 Sampling Frequency 2 eee ee ee 18 4 1 2 Sampling Frequency Deviation 2 18 4 1 3 Word Length 3 4 s ae et eke RA eee eR ee eG IB 4 1 4 Channel Origin Data
15. GNAL indicator shows up The AUTOSCAN indicator shows if input scanning is enabled If so DIGlspy will continuously scan all inputs until it recognizes a valid data stream P The Signal Quality Indicator shows the quality of the physical signal transmission in an easily understandable way This indicator is influenced by a number of different errors that DIGlspy encounters while decoding the data stream The more errors are detected per time unit and the more severe they are the lower the signal quality will be Please see section 5 3 for more information on signal quality 3 The Error Rate indicates how many transmission errors protocol errors as well as audio errors have occurred per second per minute or per hour The total count of errors can be shown too See section 4 3 on how to select time units or total error count The RECORDING indicator indicates that the error logging function is ac tive see section 5 1 DIGIspy USER MANUAL A The Sampling Frequency Indicator shows which frequency is coded in the Channel Status Bits If the input signal complies with the standard this should be identical to the actual sampling frequency DIGlspy performs a check on this and blinks the kHz indicator if differences are encountered An in depth explanation of this issue is given in sections 4 1 1 and 6 1 3 2 1 2 Protocol Analyzer Display Below the Signal Quality Display the details of the protocol of the data stream are d
16. HEADR P MUTEL P MUTER P 20 20 20 20 1 1 DiGispy USER MANUAL Consumer Mode LOCK C AMPL C CODE C PARI C VALI C CSDIF C 200 120 50 30 O 0 CLIPL C CLIPR C HEADL C HEADR C MUTEL C MUTER C 20 20 20 20 O 0 These defaults are a good starting point Section 6 2 shows how the weight of each error can be calculated from your specific quality requirements 5 4 3 Changing the PIN The PIN defaults to OOOO This menu item allows you to change the PIN For se curity reasons you are asked to input the PIN twice If you want to bypass this item to get back to the error weight settings just press the NEXT key 8 times This confirms the current PIN without changing it 6 Background Information 6 1 Notes on the IECS58 standard 6 1 1 What is a Digital Audio Data Stream DIGIspy analyzes IEC958 and AES3 digital audio data streams lt is able to de code AES EBU Professional as well as SPDIF Consumer formats It recog nizes multi channel surround formats like Dolby AC 3 MPEG 2 and DIS however it can not decode them It is not compatible with ADAT or TDIF multi channel data streams 6 1 2 Differences between Professional and Consumer Format The Professional and the Consumer Format differ in two ways First the Profes sional format if transmitted over an electrical link uses symmetrical lines car rying an amplitude of 5 Vpp measured at a charac
17. IN will only be used for saving the setup to the new memory location and will not affect the current PIN code 4 6 Utilities Menu 4 6 1 Set Minute Adjusts the minutes of the real time clock using the UP and DOWN keys The seconds are reset zero each time you press the UP or DOWN key 4 6 2 Set Hour Adjusts the hours of the real time clock using the UP and DOWN keys 4 6 3 Set Day Adjusts the day of the real time clock using the UP and DOWN keys 4 6 4 Set Month Adjusts the month of the real time clock using the UP and DOWN keys 4 6 5 Set Year Adjusts the year of the real time clock using the UP and DOWN keys 4 6 6 Factory Reset This menu item resets the unit to factory defaults lt discards any user defined settings and clears the error memory yy Because of the danger of inadvertently losing the settings the PU user has made the unit will request you to confirm this item by pressing the YES key Warning Factory Reset cannot be undone You will lose any cus tom settings as well as all logged error information DIGIspy USER MANUAL 5 Advanced Features 5 1 Error Logging 5 1 1 Principle of Operation Error Logging serves as a means of identifying errors of two different catego ries e Intermittent transmission errors occurring on unreliable lines e Audio errors indicating transmission of erroneous payload although the carrier structure Is intact If activated DIGlspy logs these errors w
18. ON CREM in two ways it is coded in the Channel Status Bits ATO RU and it can be measured using a frequency counter Lt OOOO ACT see section 6 1 3 DIGlspy does both Usually both GU O COUTO values should be identical however measuring is more accurate than just decoding the status bits because it takes into account any clock deviations of the sig nal source To display the measured sampling frequency use this menu item 4 1 2 Sampling Frequency Deviation If the Channel Status indicates the sampling COMACRENARE TW frequency this menu item displays the devia OIDO PI UA tion of the measured frequency with respect A morn to the value indicated by the Channel Status in C Propet terms of ppm 10 8 4 1 3 Word Length Professional Mode data streams contain in Mi CPT TL ed formation on the word length of the audio OU MIA A data 16 to 24 bits which is displayed by this UT menu item EA D Note The number of data bits actually used by the audio signal may differ from the word length indicated by the channel status 4 1 4 Channel Origin Data Channel origin data is an optional part of a Profes ory et i sional Mode data stream It consists of four alphanu SILL U meric characters designating the data source rie Y Cal l 18 DIGIspy USER MANUAL 4 1 5 Channel Destination Data Channel destination data is an optional part of a Pro PRESTO E fessional Mode data stream It consists of four alpha
19. Signal quality extremely low Check source replace cable Electrical amplitude too low Switch input to COAXIAL CONSUMER LEVEL recognized but monitor output muted Optical input used with recognized sea einem ae None Signal source uses above Ank weak optical transmitter Eee ive pep Check source replace cable Monitor Volume set to pena Increase monitor volume Input signal Signal quality too low Check source replace cable Input data is non audio None Input data carries multichannel audio data None 35 USER MANUAL DiGispy Symptom Cause Action Input data is non audio but is not marked as Noise on Monitor such None Protocol violation by signal source output Input data is multi channel but has no status data indicator None Sampling Frequency on main display differs from measured rt Seas nets None Protocol violation consistent by signal source sampling frequency in the INFO MENU Accumulator polarity not DRS Red CHARGE LED Check polarity replace l correct or accumulator lights up i accumulators defective 8 Accessories To adapt DIGIspy to different measurement tasks and to expand its scope the following accessories and replacement parts are available ACA 751 AC Adaptor US plug ACA 752 AC Adaptor Euro plug DCA 75 Car Adaptor SC 1 Symmetrical electrical signal cable 1 m SC 2 Optical si
20. aptor has become defective order a replacement part see section 8 11 USER MANUAL DIGIispy 2 5 Keys DIGlspy s four keys are organized as follows The POWER key turns the unit on and off and serves POWER ESC 0 as an escape key to cancel any menu operation To ESC turn the unit on press the POWER key until the dis play turns on To turn it off press and hold the FUNCTION keys POWER key for about 1 5 seconds until the display shows 5000B7E Then release the POWER key To can NEXT gt cel a menu operation tap briefly onto the POWER key The FUNCTION keys are used to operate the menu UP YES The NEXT key enters the menu and advances from YES one menu item to the next The UP key increases the value of a menu parameter and serves as the YES key DOWN NO for any Y N questions contained in the menu The DOWN key decreases the value of a menu parameter and serves as the NO key for Y N questions As long as the menu is not active the UP and DOWN keys are used to increase and decrease the volume of the headphone output 2 6 Battery compartment On the back of the unit there is the battery compartment It holds two AA UM 3 accumulators or dry cells Before powering up for the first time open the battery compartment by remov ing the two screws that hold the battery compartment cover in place Insert the two accumulators included with the unit observing the polarity indication on the bottom of
21. asy to carry it around thanks to a unique belt strap from which the case can easily be detached by turning it by 180 The case has a separate pocket for the XLR Cinch adapter on its left side The AC adaptor can be used world wide however you may need a travel adaptor to convert different mains plugs into the one fitted to the AC adaptor See section 8 for a list of accessories and replacement parts USER MANUAL DiGispy 2 Display Controls and Connectors 2 1 Display The LC display is the largest element of DIGlspy s front panel lt is divided into six different areas which are explained in detail below 2 1 1 Signal Quality Display The upper left portion of the display shows all information about which source is being decoded and its transmission quality 1 The Input Indicator shows which input is currently being decoded This can either be OPTICAL or COAXIAL in case of an electrically coaxially connected data stream DIGlspy checks if the signal level complies to the AES EBU specifica tion that requires a nominal ampli tude of 5 Vpp If and only if this is true the PROFESSIONAL LEVEL NO SIGNAL AUTOSCANNING COAXIAL PROFESSIONAL LEVEL OPTICAL CONSUMER LEVEL SIGNAL QUALITY ERROR RATE UU blk A Bee 1 2 3 4 5 SAMPLING FREQ LU UNKNOWN O kHz RECORDING indicator shows up otherwise the CONSUMER LEVEL indicator is ac tivated If DIGlspy can not detect any valid input signal at all the NO SI
22. ator is visible data is not suitable for D A conversion either be USER MANUAL DiGispy cause it needs to be decoded first or It is no audio data at all Note As soon as the Non Audio Indicator is visible the monitor output will be muted multi channel audio data from a DVD player Multi Channel Indicator Shows whether the transmitted data is Note 1 Because DIGIspy does not decode multi channel formats the Level and Vectorscope display will be blanked and the monitor Output muted 2 Some multi channel data streams do not carry an indicator in their status data DIGlspy cannot identify such data streams as being multi channel 2 1 3 Level Meter On the right of DiGlspy s display there is a level meter peak programme meter that complies to IEC 268 18 Its resolution at high levels is 0 25 dB and decreases towards lower levels It has a peak hold time of 1 7 seconds At the very top of the scale there is a Clipping Indicator that lights up as soon as a number of consecutive full scale samples have been detected The number of samples triggering the Clipping Indicator can be set please see section 4 4 2 for more information 2 1 4 Vectorscope The lower left part of the display consists of a vectorscope goniometer display that shows a two dimensional representation of the amplitude of each stereo channel The figure at the right shows how the display might look like if a stereo signal is displayed
23. d Maintenance 90 ace Troubleshooting Bs 64224 26 2s ss BO 8 Accessories 2 1102 s s 8 8 8 non a a 26 9 Specifications s s n n s s 2 32 9 1 Digital Audio Interface 87 9 2 Level Meter ee ee 9 9 9 VECLOFSCOPDE 2 e 2 ee ses ewe ee ee a ee ee OF 9 4 Protocol Analyzer 2 4 0 2 dS Se ee eH eS eR Ee BO 340 Monitor Output s ssas eee 2 tb eRe ee Ae Ss BO 9 6 ED N Gane state ee Bes Aes bee ee Bee ee Oe Manual Conventions Warnings marked with the sign on the right are intended to alert the user of possible personal injury damage to the unit or data loss Information paragraphs marked with the sign on the right contain tips and hints on how to make best use of DIGIspy s capabilities Information displayed on DIGlspy s screen is printed in a SPECAL FONT sc i p DIGIspy USER MANUAL 1 Introduction Thank you for selecting DIGlspy as your portable Digital Audio Analyzer Although DIGlspy is a small portable and lightweight unit it is a full featured measure ment device As such please handle it with care Your DIGlspy package contains the following components SCHMID DIGIspy a the unit itself b two AA accumulators a leather case d an XLR Cinch RCA adaptor e an AC power adaptor European part shown above The leather case not only protects DIGlspy from dirt and moisture but it also makes it e
24. e independently for the left and right channel The headroom threshold also sets the reference level of the vectorscope at which the matrix shows full scale This allows to use the full extent of the ma trix even when displaying low level signals This menu item allows setting of the headroom from O dBFS default to 30 dBFS at a resolution of 1 dB You can also set exactly 1 or 2 LSBs of head room Use the UP and DOWN keys to increase or decrease the headroom The display and error log reflect any changes in real time 4 4 2 Clipping Sensitivity DIGlspy interprets multiple consecutive full scale sam ples as clipping If this happens an error is displayed and stored in the error log if enabled Clipping is de pan tected independently for the left and right channel USER MANUAL DIGIspy This menu item sets the minimum number of consecutive full scale samples which are considered to be clipping The UP and DOWN keys let you set values of 2 default very sensitive up to 10 insensitive 4 4 3 Silence Sensitivity DIGlspy does not only recognize loss of digital audio L carrier but also loss of payload digital silence while the carrier stays intact Silence detection is carries i out independently for the left and right channel The amount of time DIGlspy tolerates before the silence detector triggers can be set from 2 ms to 10 s using the UP and DOWN keys Please note that silence detection only triggers on comple
25. ed lt shows the total number of errors since the last reset Resetting is done by changing the error rate unit or switching off the device HT EVE Note the following difference The Error Log is retained when the unit is switched off but all Error Rate calculations are reset This is due to the fact that it makes sense to recall errors from the past but it makes no sense to calculate an error rate from a mix of the current measurement cycle and from a cycle in the past DIGIspy USER MANUAL 4 3 5 Clear Error Log This menu item enables the user to clear the complete error log This is necessary if error statistics are to be limited to a specific period of time JJ a Because of the danger of inadvertently losing informa LIV UI tion the unit will request you to confirm this item by pressing the YES key Z Z _ l Warning Clearing the Error Log cannot be undone You will lose any information that has been logged since then 4 4 Parameter Menu The Parameter Menu contains a number of settings to customize DIGlspy to your personal requirements 4 4 1 Headroom DIGlspy uses a headroom detector to check for lev A a a els that violate a certain threshold which can be set I PULP I i here If there is less headroom left until full scale im mMncc the headroom detector triggers and generates an Ls we error record which is shown on the display and in cluded in the error log Headroom check is don
26. eee eee EO PO 4 6 tilities Men s s 52s ik 4S eds ee we BO 4 6 1 Set Minute 2 2 we ew ko ee a ew ee we ewe 4 oe O 4 6 2 Set Hour 4 fa ek tee eR ee ee ee AA oe O 4 6 3 SEU s ae ee Oe bee Re ee Ree ee Ye ee we EO 4 6 4 DEG MONCH s s s s a s rak esti se eH ee ee Ee eS CO 4 6 5 SETE a s eare te GRR oe ee oo eee we eS ee en 4 6 6 Factory Reset ee ee ee ee ee 2B 5 Advanced Features s s 27 5 1 Emar LON lt a serey amid redka ee be Se ot ee C7 5 1 1 Principle of Operation aa 7 Oo be Logging Details io eeeen te eG wd 28 9 1 3 Memory Considerations 29 De Error Rate Calculation lt lt lt 4 2s ee wi ae de 6 8 20 USER MANUAL DIGIspy 23 Signal Quality Calculation 90 0 4 Customization 22 4 66 4 we a Be ee we Se 2 amp BD 5 4 1 Locking and Unlocking the Configuration 90 0 4 2 Setting Error Weights 2 2 2 2 2 2 2 2 4 2 4 2 81 0 4 3 Changing the PIN 2 lt 4 4 e we BO S Background Information a a a a 33 6 1 Notes onthe IEC958 standard 33 6 1 1 What is a Digital Audio Data Stream 33 6 1 0 Differences between Professional and Consumer Format 33 6 1 3 Sampling Frequency Indication 34 6 2 Notes onerrorweights 34 7 Tips and Hints s o on n a 2S 7 1 Cleaning an
27. ely To the right of the monitor volume scale there is the battery gauge showing the remaining run time of the unit before the accumulators need to be recharged The plug symbol beneath the gauge indicated that the unit is currently on external power supply Note lf the unit is being charged but switched off the battery gauge will not be shown E E MOS Located below the LC display there are three light emitting diodes LEDs showing the state of the accumulator charging process The green LED is lit as soon as the accumulators are fully charged The yellow LED is lit as long as fast charging is in progress The red LED is lit if the unit detects an accumulator failure e g one or both cells are defective they have been inserted with polar ity reversed or the cells have reached their end of life USER MANUAL DIGIispy 2 2 Input Connectors DIGlspy uses two input connectors one XLR 1 and one Toslink 2 connector You can connect the source to be analyzed to either of them Unless you switch off the autoscan feature see section 4 1 DIGlspy automati cally detects on which input there is a valid data stream and locks on to this input To connect an electrically transmitted data stream to the XLR connector use a Digital Audio Cable Do not use an analog microphone cable although it would fit mechanically This is because microphone cables are not suitable for transmis sion of high speed digital signals
28. ffer in about 22 minutes effectively limit ing logging time to this amount 5 2 Error Rate Calculation DIGlspy calculates the rate of transmission errors per second per minute or per hour independently from the error logging feature Any error that has a weight greater than zero is taken into account when this calculation is made See section 5 4 2 for more details on error weights The unit extrapolates the error rate measured based on the time unit selected Thus you may display the error rate per minute although you did a five seconds measurement only Certainly measurement accuracy increases with observa tion time You may freely change time units while measuring without destroying any error rate data previously accumulated However when changing inputs er ror rate data is reset The unit is also able to display the total number of errors that occurred since the last reset See section 4 3 4 on how to do this eg USER MANUAL DIGIspy 5 3 Signal Quality Calculation Although detailed error information is the most accurate way to define the qual ity of a transmission line or path it is difficult to read because of the amount of information and the specific knowledge required to interpret the information Therefore DiGlspy defines the quality of a line on a five level scale of arbitrary units This reduces the amount of information presented to the user and thus is much easier to use The relationship between err
29. g sessions DIGIspy USER MANUAL Error logging takes precedence over display updates Thus if excessive error bursts occur the level meter and or the vectorscope might become unstable or jumpy as long as the error burst lasts 5 1 3 Memory Considerations The Error Log is organized as a circular buffer holding the most recent entries If the buffer is full when a new record is stored the oldest one gets lost Error Logging employs compression technology to make most effi cient use of the memory available Basically there is space for about 500 error records However if the same error occurs re peatedly or multiple errors occur simultaneously only little extra memory space is consumed Thus in practice more than 1000 er rors can be logged easily When calculating the time that the logging memory will last consider that one event e g disconnecting a cable will result in multiple errors occurring rapidly one after another First signal amplitude will cease Then coding errors will oc cur and finally the unit will lose lock As another example signal sources with unstable output may fill the whole logging memory in as little as 20 seconds When using error logging with the Autoscan feature enabled take into account that selection of another input causes an information record to be generated In case no sources are connected the Autoscan feature will periodically generate such records thus filling up the logging bu
30. gnal cable 1 m SCY 1 Symmetrical electrical Y signal cable 2 x 0 4 m SA 1 XLR Cinch adaptor SA 2 Cinch BNC adaptor SA 3 XLR BNC adaptor SA 4 XLR Cinch Adapter with impedance matching SA 5 XLR BNC Adapter with impedance matching NHA 2 Accumulators set of 2 DiGispy USER MANUAL 9 Specifications 9 1 Digital Audio Interface Standard IEC 958 AES EBU or SPDIF Input Connectors XLR Toslink Sampling frequencies 32 44 1 48 64 88 2 96 kHz Input termination 110 ohms Input amplitude range 0 2 Vpp to 2 Vpp consumer mode 2 Vpp to 20 Vpp professional mode Phantom power protection up to 90 V DC Optical input power range 14 5 to 27 dBm 9 2 Level Meter Standard IEC 268 18 Type Incremental Bar Range 60 dBFS to 0 dBFS Resolution 025 dBFS maxr 9 Catto MIN Delay Time 40 ms Return Time leas Clipping Indicator Threshold 2 10 consecutive samples of FS or FS 9 3 Vectorscope Matrix Size 55 x 55 cots Delay Time 20 ms tn 37 USER MANUAL DIGIspy 9 4 Protocol Analyzer Standard IEC 958 AES3 Formats Professional Consumer Sampling frequency Data format User data mode Information indicated validity emphasis address code time code source and dest ID copy protection category code more No Lock Amplitude Parity Coding CRC Validity Channel Status difference
31. ightly reduced while charging Is in progress 3 2 Power sources DIGIspy runs from its accumulators or from an external power supply This can be the mains power using the AC adaptor included with the unit which has a wide input voltage range of 100 to 240 V As an accessory you may buy the DCA 75 car adaptor that allows you to run or recharge the unit from a car or truck battery Regardless of which adapter you use the unit can always be op erated and recharged at the same time You may also substitute the accumula tors with dry cells but this feature is provided mostly for emergency situations If you need to replace the accumulators use first quality nickel metal hydride Ni MH accumulators with a capacity of at least 1300 mAh Make sure to dispose of defective accumulators according to local regulations Accumulators may contain heavy metals USER MANUAL DIGIspy Always switch the unit off before replacing accumulators in order to preserve all data In order to preserve real time and date either replace the accumulators within 5 seconds or connect the external power adaptor Do not expose the external power supply to moisture to prevent electrical hazard Never mix accumulators of different type or ac cumulators and dry cells Never attempt to recharge the unit while dry cells are inserted into the battery compartment You MUST remove any dry cells before you can operate the unit from an external power supply Failure
32. isplayed 1 The most important informa PROFESSIONAL tion in the Protocol Analyzer MODE Display is the Mode Indica CONSUMER tor lt shows if the data MODE stream complies to the EMPHASIS 50 15 J 17 AES EBU PROFESSIONAL USER DATA AES18 DATA INVALID or SPDIF CONSUMER SCMS COPY PROHIBIT NON AUDIO MODE MULTI CHANNEL A number of protocol details depend on this mode Consequently some indica tors of the Protocol Display are only active in Professional Mode while others only have a meaning in Consumer Mode 2 3 Emphasis Indicator Shows whether the data stream was coded with emphasis and if so which type of emphasis has been employed Note DiIGlspy does not de emphasize any signals User Data Indicator Indicates whether user data is present in the input signal and if so which user data mode is used Copy Protection Indicator Consumer mode only Shows whether the Signal bears copyright information as per SCMS Serial Copy Management system definition If SCMS is present it shows whether copying is al lowed or prohibited Validity Indicator Shows whether the audio data being transmitted is valid If DATA WALI is displayed data will not be output by a D A converter Note The monitor output of DIGIspy will output invalid data too in order to allow testing Non Audio Indicator Shows whether the transmitted data is linear PCM audio data or non linear data multi channel audio or computer data If the indic
33. ithout user intervention in its non vola tile Error Memory Each error is logged in a record that contains its type the time and date when it occurred and if available the Local Sample Address and Time Code that facilitate correlation of events contributing to a particular transmission error The last error will always be displayed in the menu area after the LERR indica Lor The table below shows the error types defined their meanings and short desig nators Error Type LERR designator Description PLL unlock LOCK Unable to decode data stream Carrier a BES amplitude AMPL Carrier signal quality is poor Parity PARI Bit error in the main data stream Coding CODE Bit error in the synchronization information preamble CRC CRC Bit error in the status information Source indicates that the data is not Validity VALI mae Different status data in both stereo CSB different CSDIF channels USER MANUAL DIGIispy Error Type LERR designator Description cure Payload was clipped at full scale wile Clipping CEIPR being digitized or processed left right CLIP or both channels respectively HEADL Headroom HEADR Payload violates headroom left right or violation HEAD both channels respectively MUTEL Payload is zero Digital silence is Muting MUTER transmitted left right or both MUTE channels respectively Error Log records can be displayed as a
34. kind of signal source DIGIspy is con nected to Use this menu item to display the Category mi Code LL yl AT E 4 2 Input Menu 4 2 1 Select Input This menu item lets you select which input signal to decode and which amplitude level to assume ZO rin Pressing the UP and DOWN key scrolls through all II OU combinations of inputs and amplitude levels If you switch to another input and the Autoscan feature see next section is disabled DIGlspy will stay there regardless whether a valid data stream is pres ent on this particular input or not If the Autoscan feature is enabled DIGlspy will only lock onto that input if valid data is present there and the signal Strength threshold for the amplitude level selected is met 4 2 2 Set Autoscan Feature This menu item serves for activating or deactivat sw eT e ood eT Yo i ZET O EF IA ing the Autoscan feature which makes DIGlspy A O A A O A scan all inputs until it identifies valid data on one of them To toggle this feature on or off press the UP or DOWN key Leaving autoscanning enabled is best in most cases except if you want to de tect and log at what point of time the data stream at a specific input appears or disappears 20 DIGIspy USER MANUAL 4 3 Error Menu The Error Menu is used to access the Error Logging and Error Rate features Error Logging is a powerful feature that will be explained in detail in section 5 1 4 3 1 Activate Error Logging
35. or rate and signal quality is defined in an intelligent manner Any transmission error that has a weight of more than Zero influences the qual ity indicator The more severe the error is the higher its weight and the greater its impact on signal quality The weights of the individual error types are preset by default but they can be set individually by the user See sections 0 4 2 and 6 2 on how to do this 5 4 Customization 5 4 1 Locking and Unlocking the Configuration Changes to the configuration are done using a special menu so called Configu ration Menu To avoid inadvertent or unauthorized changes to the configuration this menu is protected by a security code PIN To access the Configuration Menu press the NEXT key while switching on the device You are then asked if you want to enter the Configuration Menu If you press YES you are requested to enter the security code PIN Use the UP and DOWN key to enter the first digit Then press the NEXT key to advance to the next digit Use the UP and DOWN key to enter it again Repeat this four times If the PIN is correct the Configuration Menu is unlocked If the PIN is wrong you may retry up to three times After the third incorrect input the Configura tion Menu becomes permanently locked The default PIN is OOOO See section 5 4 3 on how to change the PIN Once you enter the PIN correctly you may access the Configuration Menu again it is displayed after the UTILS menu un
36. re their personal preferences without affecting other us ers configurations When switching off DIGlspy stores the last setup and re members it when being switched on again One setup contains all settings of the PARMS and CONFIG menus see sections 4 4 and 5 4 2 Error memory is not part of an individual setup it is shared be tween all four setups 4 5 1 Select Setup This menu item selects one of four setups the next Le Cb to h I O menu items will be operating on Use the UP and DOWN keys to select setup 1 to 4 m 4 5 2 Load Setup This menu item loads the setup which was selected PR before Execute the operation by pressing the A Hi i UP YES key or cancel it by the DOWN NO key ma The new setup overwrites the actual configuration without any exception and including error weights If you want to preserve the previous configuration please save it into a different setup number prior to recalling the new setup 4 5 3 Save Setup This menu item stores the current configuration into the setup memory which was selected above Exe LLO cute the operation by pressing the UP YES key or cancel it by the DOWN NO key USER MANUAL DIGIspy Overwriting a setup is only possible if its PIN code for accessing the CONFIG menu see section 5 4 1 is identical to the PIN code of the current configuration If the PIN codes are different DIGIspy prompts you to input the PIN code of the setup you intend to over write This P
37. ronic Badstrasse 39 72 66 Reutlingen Germany declare under our sole responsibility that the product DIGIspy Digital Audio Transmission Analyzer ltem No 112Be fulfills the requirements of the standards EN 55103 part 1 EN 55103 part 2 when operated within environmental specification E4 and therefore corresponds to the regulations of the EMC Directive 89 336 EW6G Reutlingen 09 01 2000 Qe Sia SCHMID electronic Dipl Ing Steffen Schmid 40 DIGIspy USER MANUAL Notes 41
38. te digi tal silence audio data 0 Low level noise contained in analog signals that have been converted to digital does not trigger the silence detector 4 4 4 Select Monitor Channel The monitor output has a channel comparison COT feature see section 2 1 6 To switch between SY different channels use this menu item Pressing the UP and DOWN keys scrolls through the available selections Stereo ST Mono Sum MOQ Left channel only L and Right channel only R 4 4 5 Set Power Off Timeout To customize the Auto Power Off Timeout use this menu item Pressing the UP and DOWN keys adjust the timeout in a range of 15 to GOO seconds in 15 seconds increments 4 4 6 Auto Power Off with external power By default DIGIspy does not power off automatically rom MEE ve while it operates from external power You may change 9 0J Ly OU this pressing the UP or DOWN key while this menu OVT Coen item is displayed LAG PLLOA 24 DIGIspy USER MANUAL 4 4 7 Set Backlight Timeout Using this menu item in conjunction with the UP and ET ON 1 DOWN keys you may adjust the Backlight timeout of LU LO LA A AO the display between 5 seconds 10 seconds always on or never on The timeout is measured from the last key hit 4 5 Setup Menu Setups are used to store and recall complete DIGIlspy configurations DIGlspy stores four different setups which can be customized by the user This enables multiple users to sto
39. teristic impedance of 110 ohms The Consumer format uses asymmetrical lines with an amplitude of 0 5 Vpp at a characteristic impedance of 75 ohms USER MANUAL DIGIispy Second the Channel Status of both formats differs While the Professional for mat can carry specific information on emphasis local sample address time code scaling origin and destination information and more the Consumer for mat carries a copy protection SCMS indicator and a category code identifying the kind of signal source See the IEC 958 standard for more details 6 1 3 Sampling Frequency Indication Due to historical reasons there are two ways of determining the sampling fre quency of a data stream it can either be measured by a frequency counter but it can also be decoded from the Channel Status Bits In some cases this may lead to discrepancies between the values obtained by these two methods This is especially true for frequencies above 48 kHz that are not included in the IEC958 standard However some unofficial definitions exist on how to code these frequencies On its Protocol Analyzer display DiGlspy gives priority to the value coded in the Channel Status Bits However if the CSBs do not contain any valid sampling frequency indication including extended rates from the unofficial definitions the measured value is displayed instead The sampling frequency value in the INFO menu is always the one measured by the frequency counter
40. the battery compartment Then put the cover back in place 12 DIGIspy USER MANUAL 3 Making Measurements If measurement results are of vital importance please double check for correct settings of the unit You may also be required to check the results using additional equipment 3 1 Charging the accumulators The accumulators are initially not charged To charge them connect the AC adaptor to the power connector on the right side of the unit and plug it into a mains outlet The yellow CHARGE LED will turn on now Let the unit charge this will take about five hours Then the green CHARGE LED will turn on showing that charging has been completed If instead the red CHARGE LED lights up disconnect the unit from the mains power supply and check for correct accumulator polarity Retry charging then if the problem persists one or both accumulators are defective At the moment when the AC adapter is connected to the unit and then powered on the green CHARGE LED will always turn on for several minutes even if the accumulators are fully charged While charging be sure not to obstruct heat dissipation of the unit Neither in sert it into its leather case nor expose it to high ambient temperatures The unit is able to be operated and charged simultaneously In this case the charging indicators are visible only as long as the display backlight is not turned on Due to internal power dissipation display contrast may be sl
41. til the device is switched off Once configuration has been unlocked it can be accessed by any one until the unit is switched off Keep this in mind when giving away a unit the configuration of which has been changed immedi ately before DIGIspy USER MANUAL 5 4 2 Setting Error Weights To define the relationship between error rate and signal quality each error has an associated weight Setting error weights is done by means of the Configura tion Menu The unit has a separate set of error weights for Professional Mode and Con sumer Mode signals This allows to exclude errors like the CRC error that do not have a meaning in Consumer Mode data steams The following weights can be set LOCK P Lock Error Professional Mode AMPL P Amplitude Error Professional Mode CODE P Coding Error Professional Mode PARI P Parity Error Professional Mode CRC P CRC Error Professional Mode VALI P Validity Bit Set Professional Mode CSDIF P Channel Status Difference Professional Mode CLIPL P Clipping on Left Channel Professional Mode CLIPR P Clipping on Right Channel Professional Mode HEADL P Headroom violation Left Channel Professional Mode HEADR P Headroom violation Right Channel Professional Mode MUTEL P Muting on Left Channel Professional Mode MUTER P Muting on Right Channel Professional Mode LOCK C Lock Error Consumer Mode AMPL C Amplitude Error Consumer Mode CODE C Coding Error Consumer Mode PARI C
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