cedar dc-1 series 2
Contents
1. 8 BEFORE CONNECTION cccccccsscscssessesescescseesessescssesesecseseessescsecsesesesessesessesecsecsesscsesecassecsesaesscacsecaesesaeesseeeeseeaens 8 POWER CONNECTIONS ccccccsscscssescesescesessesessesesecscecsessesscsesecscsecsesessesecsessesesacsscsesecsesecsesesseeacsecaesecseseeseeeeseeaeas 8 SIGNAL LEAD CONNECTIONS cccccscscssescssesceseseesesecseseeseseescecsesacsecacsessesessesacseacsecsesecsesecsesecseeacsecaeseesesesseeees 8 OTHER CONNECTIONS cccccsscscsscscsscsessessesesecsessesesecsescsescsessesesesecsesecsseacsessesecsesessesacsecacsecsesessecacsecaesesaeseeaeeees 10 SAMPLE INSTALLATION IDEAS 11 A GUIDE TO RESTORATION PROCESSING esseseossoscossossossoseoseoseoseossossossoseossoseossoseessosseseossoseosseseeseeseesee 12 FRONT PANEL INDICATORS AND CONTROLS eeeeeeeeeee estate tata tata tata ta tata tata tata tasas tasas tasas tata ao 14 QUICK TOUR M M 16 WARMSTART AND COLDSTART 17 OPERATING THE CEDAR 1 SERIES 22. sssssssssssssssssssssesesesesesesececesececececesecesscssesesesesesecesesesesesesesesesens 18 DEDICATED CONTROLS f de hs 18 PAGES e eli e eet me td hi t tv fir det e he 20 Control Page se RR RR RPORRRURURRRRURRERRREERRERERERRRRRRRERRRD IRR RR RENE 21 Input Output Control Page ss ER NS 23 i one RO ea aed nU RS 27 STATUS PAGE aan Gt V Erde oe ee ETC UC 28 STATUS INDICATORS PUN deed tech ote IUE 28 NOTES AND HINTS TO USERS csssssssssssssssssesssssesssssesssesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesesereres 31 REMOTE CONTROL PROTOCOLS e eeeeeeeee esee tete tata tata ta tata tata ta tata ta tata ta tata ta tata ta tata tata tata 32 85232 ee 32 jj M M 34 SELE TEST elec ec C M 35 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 2 INTRODUCTION Thank you for purchasing the CEDAR DC 1 De clicker The original DC 1 was the world s first real time dedicated digital de clicking device and the DC 1 SERIES 2 offers even greater processing power and performance powe
3. Remember that all outputs are permanently active and that they do not require selecting but that the same digital data is supplied to both AES EBU and SP DIF outputs The data format will therefore only be appropriate for one digital output at any given time There are three options in the I O Control Page A DIGITAL OUTPUT This option defaults to AES EBU To toggle between the two output modes AES EBU and SP DIF press the Function Key marked A on the LCD screen AES EBU FORMAT When AES EBU is selected both the phono and XLR connectors will carry AES EBU specification audio data You should patch the output from the XLR connectors to your recording device The DC 1 SERIES 2 features 24 bit input and output resolution when AES EBU is selected SP DIF FORMAT When SP DIF is selected both the phono and XLR connectors will carry SP DIF specification audio data You should patch the output from the phono connectors to your recording device TPDF dithering will be applied to the digital data at the 16 bit level and is always applied at the analogue output DC 1 SERIES 2 Rev 02 Ver 3 06 Page 23 INPUT SOURCE There are three input sources AES EBU SP DIF and ANALOGUE To toggle between the input sources press the Function Key marked B on the LCD screen The Status LEDs will indicate the inputs selected and the sample rate received digital or selected for conversion analogue SAMPLE RATE OF INCOMING
4. CEDAR Professional Hardware Systems DC 1 De Clicker Digital Audio Restoration System SERIES 2 gae O in AE X3 A AO s gt N se Post Level o0 P Pre Post Enter 5 T 2 ys CEDAR eciicker is i SSS Se ea z M M UN SERIES 2 O OWNER S MANUAL 1994 CEDAR Audio Ltd Written by Gordon Reid DC 1 SERIES 2 Rev 02 Ver 3 06 Page 1 TABLE OF CONTENTS TABLE OF 5 2 INTRODUC TION 3 THE BACKGROUND TO SCRATCH REMOVAL s sessessossoscoscoseoscossoseossossoseossoseoseoseoseossoseoseoseossoseoseoseossosees 4 SAFETY INSTRUCTIONS ccscssscsescssscsessseseseseseseserssesedescdeserescsesedesebesenesesosedondesesesecosessedosesossdosssosesesesosesosssassoaseoasas 5 SET UP A AAEE ESEESE EEE A E 7 UNPACKING AND amp 7 INSTAELAT ION SILE 5 hifi tte de hd e e a de f v dvd ti adt 7 RACIEMOUNTING E A Sa ee GEORG 7 FREE STANDING 7 CONNECTIONS
5. 3 4 DASH 9 DAT 9 16 De Clicking 12 De Crackling 12 default values 17 De Hissing 12 De Scratching 12 DH 1 12 digital 8 Digital Output 17 digital signal processors 3 distortion 31 distortion 21 31 Dithering 9 dithering 23 DSP 29 36 dynamic range 3 EIA rack 3 5 7 Emphasis 29 Enter 14 18 ENTER 34 Error 29 error detection 23 ERROR LEVEL 26 Error Level 28 Error Levels 20 external clock 25 Function Keys 14 15 18 Function Keys 20 Grounding 6 Headphone 14 Heat 5 HISS 1 12 HISS 2 12 humidity 7 23 18 Control Page 20 input 8 14 23 24 Input Level 18 19 Input Level 15 Input Source 17 J17 29 large 22 LCD Screen 14 limiter 19 LOCAL OFF 34 LOCAL ON 34 Lock 26 LOCK OUT 18 LTC 10 magnetic fields 7 Medium 22 Memory 36 METERS 35 MIDI 10 17 27 MIDI 3 34 MIDI CHANNEL 27 MIDI DUMP 34 MIDI DUMP 18 Mode 17 21 output 8 9 14 19 Output Attenuation 18 output format 23 Over 14 Page 14 18 peak 14 Phase EX 12 phono 23 DC 1 SERIES 2 Rev 02 Ver 3 06 polarity 8 pops 4 Power connectors 6 power supply 6 Pre Post 14 17 18 PRE POST 16 Receiver Error Level 17 remote control 27 Remote Control Page 20 resolution 9 RMS 14 RS232 27 RS232 3 10 32 RS232 Protocol 27 Running 29 Sample Rate 29 sample rate 24 sample rates 3 sampling frequency 23 scratches 4 se
6. STATUS INDICATORS The front panel LEDs will help to identify the possible cause if the unit fails to function The following table lists all possible combinations of LED error indications LED flashing Condition Digital the digital input violates the Receiver Error Level or no digital sync is present if requested in I O page 44 1 and 48kHz unknown sample rate received at inputs Bypass Pre Post One or both of the DSPs have crashed DC 1 SERIES 2 Rev 02 Ver 3 06 Page 28 STATUS PAGE DEFINITIONS Crashed The DC 1 SERIES 2 DSPs are failing to function The only recourse is to switch the unit off wait for a few seconds and then switch on again If this error re occurs please refer your DC 1 SERIES 2 to an authorised service centre Timed Out If for any reason the DC 1 SERIES 2 drops out of real time fails to pass audio to the output this error will be reported This should only occur if a sample rate of greater than 50kHz is presented to one of the digital inputs This error is non fatal and the DC 1 SERIES 2 should continue to function normally after it has occurred Running The DC 1 SERIES 2 DSPs are functioning correctly and have been doing so since the unit was switched on Error If the DIGITAL LED is flashing the most serious error will be detailed at this point Errors are fully detailed in the DC 1 SERIES 2 Service Manual Emphasis If no error is detected the I O status will display the Emphasis con
7. 5 command value HIGH byte byte 6 command value LOW byte The HIGH and LOW bytes together form a signed integer 1 Command Numbers Command Values OxF7 Clear Errors command value Clear all error messages OxF8 Select Page command 1 Control Page 6 Control Page 7 Status Page 15 Remote Control Page Toggle between Pages Any other value Refresh OxF9 Pre Post command 0 Pre 1 Post 1 Toggle Any other value Refresh OxFA Bypass command 0 Bypass OFF 1 Bypass ON 2 RESERVED VALUE 3 RESERVED VALUE 1 Toggle Any other value Refresh Digital Output Format 0x80 SP DIF 0x00 AES EBU 1 Toggle Any other value Refresh DC 1 SERIES 2 Rev 02 Ver 3 06 Page 32 OxC1 0 2 0 22 0 32 0x23 0x24 0x34 Input Source Any other value A to D Frequency Any other value Receiver Error Level Any other value Set Left Threshold Any value The minimum threshold is 0 The maximum threshold is 40 Alter Left Threshold Any value Scratch Mode 0 1 2 1 Any other value Set Right Threshold Any value The minimum threshold is 0 The maximum threshold is 40 Alter Right Threshold Any value DC 1 SERIES 2 Rev 02 Ver 3 06 Analogue SP DIF AES EBU Toggle Refresh 44 1kHz 48kHz SP DIF Sync AES EBU Sync Toggle Refresh 1 Lock 2 Code 3 Trans 4 Valid Toggle Refresh Left Thresh
8. DIGITAL SIGNAL When the DC 1 SERIES 2 is switched to receive digital audio data the DIGITAL LED will be lit and the front panel LEDs will indicate the sample rate of the digital signal presented to the inputs neither 44 1 nor 48 kHz LED lit 44 1 kHz LED lit 48 kHz LED lit 32kHz signal presented to inputs 44 1kHz signal presented to inputs 48kHz signal presented to inputs CLOCK DETECTION If the DC 1 SERIES 2 fails to detect a digital signal within the following limits the 44 1kHz and 48kHz LEDs will flash continually This will be irrespective of any other system settings Acceptable ranges 44 1kHz 4 48kHz 4 32kHz 4 SAMPLE RATE OF A TO D CONVERTERS When the DC 1 SERIES 2 is switched to receive analogue audio data the DIGITAL LED will not be lit and the front panel LEDs will indicate the sample rate of the analogue to digital converters The ADCs in the DC 1 SERIES 2 do not offer a 32kHz option unless synchronised to an external 32kHz source DC 1 SERIES 2 Rev 02 Ver 3 06 Page 24 A TO D FREQUENCY INPUT SOURCE ANALOGUE The ADC frequency may be selected by two fundamentally different methods The first is to select one of the internal clock frequencies available the second is to control the sample rate by using an external clock INTERNAL CLOCK FREQUENCIES To toggle between the DC 1s internal 44 1kHz and 48kHz sampling frequencies and between AES Sync and SP DIF Sync see below
9. material Note De Clicking De Scratching should ALWAYS be carried out first This is because i Large clicks make it difficult for the De Crackling process to identify and remove the tiny clicks and crackles that constitute surface noise buzz and other such problems ii All clicks and scratches are in effect tightly defined packets of white noise If clicks are presented to any of the CEDAR De Hiss products HISS 1 HISS 2 DH 1 De Hiss they confuse the processes and create unmusical side effects In addition De Hissing at this stage will make it almost impossible to identify and remove clicks and scratches later De Crackling should be the next process because even small crackles can cause the same problems as in ii above Azimuth Correction can be carried out either before or after De Hissing but experience shows that best results are obtained using the AZ 1 or Phase EX module before De Hiss Finally apply whichever De Hiss process you wish to use If you have the full range of CEDAR restoration modules they should be connected as shown in the diagram overleaf Please note that to maintain the maximum fidelity and remove and possible sources of degradation between processes connections between modules should be by AES EBU 24 bit format DC 1 SERIES 2 Rev 02 Ver 3 06 Page 12 Digital pa Power 52300 Bypas
10. that the action of the spinwheel applies to both channels To de select a channel and to re select it as desired press the Function Key immediately below the read out The box will disappear showing that the channel is now DE SELECTED If both channels are de selected the spinwheel will have no effect Mode The CEDAR DC 1 can optimise its scratch removal depending on whether the material being processed suffers predominantly from large scratches or from smaller ticks and clicks The Scratch Mode parameter enables you to select the most appropriate setting for each restoration DC 1 SERIES 2 Rev 02 Ver 3 06 Page 21 Small Use this setting when the damage is predominantly small clicks and ticks Medium This is a compromise setting lying between the small and large settings Large Use this setting when the material suffers from larger thump like scratches Press the Function Key under the word MODE to toggle between the Scratch Mode settings WARNING Signal degradation may occur if an inappropriate Scratch Mode setting is used DC 1 SERIES 2 Rev 02 Ver 3 06 Page 22 PAGE 2 INPUT OUTPUT CONTROL PAGE CONTROL Access this page by pressing the Dedicated Function Key PAGE repeatedly until the CONTROL PAGE appears This page allows you to determine the input used the sampling frequency of the Analogue to Digital Converters the digital input error detection level and the digital output format
11. using the Musical Instrument Digital Interface MIDI Refer to the chapter on Remote Control Protocols for further instructions iii RS232 The DC 1 SERIES 2 may be controlled using the standard RS232 serial communications protocol Refer to the chapter on Remote Control Protocols for further instructions DC 1 SERIES 2 Rev 02 Ver 3 06 Page 10 SAMPLE INSTALLATION IDEAS analogue or analogue or analogue or line out digital in digital out digital in TURNTABLE OR TAPE MACHINE RECORDER line in 1 1 SERIES 2 used in line for transcription or broadcast purposes analogue or analogue or analogue or line out digital in digital out digital in RECORDER effects send effects return SOURCE 2 DC 1 SERIES 2 used on the effects loop within a studio environment analogue or analogue or analogue or analogue or analogue or line out digital in digital out digital in digital out digital in RECORDER line in 3 DC 1 SERIES 2 used in line prior to an editor or audio workstation DC 1 SERIES 2 Rev 02 Ver 3 06 Page 11 A GUIDE TO RESTORATION PROCESSING Contrary to common sense the order in which restoration processes are carried out makes a great deal of difference to the quality of the result Consequently there is one right way and many wrong ways to restore your material Following these guidelines will help you to achieve the best results on most
12. 1 SERIES 2 beyond the instructions contained in the User s Manual All other servicing should be referred to qualified service personnel DC 1 SERIES 2 Rev 02 Ver 3 06 Page 6 SET UP 1 UNPACKING AND INSPECTION Be careful not to damage the DC 1 SERIES 2 during unpacking Save the carton and all packing materials since you may need them to transport the DC 1 SERIES 2 in the future In addition to the packaging the carton should contain the following mains connection lead this manual INSTALLATION SITE The DC 1 SERIES 2 may be used in most areas but to maintain reliability and prolong operating life observe the following environmental considerations Nominal temperature should be maintained between 5 and 35 Centigrade 41 and 95 Fahrenheit e Relative humidity should be in the range 30 to 60 non condensing Strong magnetic fields should not exist nearby RACK MOUNTING The DC 1 SERIES 2 can be mounted in a standard 19 EIA rack FREE STANDING USE The DC 1 SERIES 2 can be used as a freestanding unit The blanking plates may then replace the rack mount ears if desired To replace the ears with the blanking plates Unscrew the three bolts that attach each ear to chassis of the 1 Attach the blanking plates using the same retaining bolts Do not over tighten these bolts as doing so may cause damage to the DC 1 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 7 CONNECTIONS The DC 1 S
13. Cs amp DACs Both channels of audio are carried along a single cable so you may connect the AES EBU output from your source to the AES EBU input of the DC 1 SERIES 2 using a single cable terminated with XLR plugs The AES EBU output of the DC 1 SERIES 2 may be connected to the AES EBU input of your digital mixer recording device or external DAC 24 bit Digital data resolution The DC 1 SERIES 2 features 24 bit input and output resolution whenever the AES EBU digital input and output are utilised Dithering The DC 1 SERIES 2 also features TPDF Triangular Probability Density Function dithering This is applied to the digital data when the SP DIF output format is selected Dithering is always applied to the data presented to the DACs DC 1 SERIES 2 Rev 02 Ver 3 06 Page 9 In order to comply fully with EMC regulations this unit should be connected via its AES EBU and or analogue connectors Metal shelled XLR connectors should be used We recommend using a good quality starquad cable with three cores connected to pins 1 2 amp 3 The shield of the cable should be connected at both ends to the outer shell of the connector 4 OTHER CONNECTIONS i SMPTE EBU An optional SMPTE EBU interface offering LTC and VITC protocols is available for the DC 1 SERIES 2 The standard DC 1 SERIES 2 does not support timecode and these connectors are not present ii MIDI INJOUT THRU The operation of the DC 1 SERIES 2 may be controlled
14. ERIES 2 may be connected to most of the professional audio equipment currently available Three types of audio input and output are provided one analogue and two digital and these will satisfy most users interconnection requirements Full descriptions of these connectors will be found later in the manual 1 BEFORE CONNECTION To prevent problems and possible equipment damage turn off the power to all equipment before making connections Be sure to insert plugs firmly into sockets Loose connections may cause hum and noise e When unplugging any lead do so by grasping the plug not the lead 2 POWER CONNECTIONS Ensure that the DC 1 SERIES 2 is switched OFF before inserting the mains lead NOTE Users with 2 pin mains supplies When the DC 1 SERIES 2 is connected to other audio components the AC hum of the unit may be increased or decreased by reversing the direction of the power connector in the socket Check that the cord is in the favourable position in phase with respect to other audio devices in the chain This will ensure that you obtain the best sound quality from your DC 1 For further information on grounding and polarity consult a person familiar with studio grounding techniques 3 SIGNAL LEAD CONNECTIONS Refer to the Rear Panel diagram The DC 1 SERIES 2 offers three audio connection standards one analogue and two digital These are balanced analogue audio digital SP DIF format audio data
15. S AND CONTROLS Refer to the Front Panel diagram 1 2 Power Switch Input Signal Meters Left and Right Digital signal meters display the peak value of the selected input in dBOs The indicators will light if the input signal remains at full scale for four or more consecutive samples Output Signal Meters Left and Right Calibrated signal meters display the RMS value of all output signals The indicators will light if the output signal remains at full scale for four or more consecutive samples LCD Screen Provides you with a variety of information and messages keeping you aware of what is currently happening in the DC 1 SERIES 2 All the control screens of the DC 1 SERIES 2 are displayed on the LCD screen Please refer to the following chapters for full instructions Status Indicators Indicate the status of the analogue and digital inputs and whether the DC 1 SERIES 2 is in idle or processing modes Also indicate the possible causes should the unit fail to function Dedicated Function Keys Certain functions are fundamental to operating the DC 1 SERIES 2 and these are controlled by the Dedicated function keys Bypass Page Pre Post and Enter Spinwheel The spinwheel enables you to increase and decrease control values Please refer to the following chapters for full instructions Headphone Socket For use with stereo headphones only Accepts a standard 1 4 stereo jack plug DO NOT use 2 c
16. digital AES EBU format audio data Note that the DC 1 SERIES 2 always passes its output to all three signal outputs irrespective of the input used but that the digital data will only be formatted for either AES EBU or SP DIF as defined by the user parameters DC 1 SERIES 2 Rev 02 Ver 3 06 Page 8 1 Balanced analogue audio I O Pin 2 This standard is used in professional audio equipment Connect the output from your source to the balanced analogue inputs of the DC 1 SERIES 2 using standard XLR plugs You will require two such connections one for each channel The balanced audio output may be used to connect the DC 1 SERIES 2 directly to audio equipment such as mixing desks and professional recorders featuring balanced XLR inputs and outputs ii _ Digital SP DIF format audio data The SP DIF format is used by domestic and semi professional digital audio devices such as DAT machines some ADCs and some CD players Both audio channels are carried along a single cable so you may connect the SP DIF output from your source to the SP DIF input of the DC 1 SERIES 2 using a single cable terminated with RCA or phono plugs The SP DIF output of the DC 1 SERIES 2 may be connected to the SP DIF input of your recording device or external DAC iii Digital AES EBU format audio data The digital AES EBU format is used by professional digital audio devices including mastering systems DASH recorders and high quality AD
17. directly from a cold environment into a warm one moisture may condense inside the unit This in itself will not damage the DC 1 but may cause hazardous electrical shorting to occur This could severely damage the DC 1 and even cause danger to life ALWAYS allow time for the DC 1 to reach ambient temperatures before connecting the mains power Mounting The DC 1 SERIES 2 should be carefully mounted in a 19 EIA rack or placed on a flat stable surface If used on a cart or free stand care should be taken when moved uneven surfaces or excessive force may cause cart and DC 1 to overturn Do not position the DC 1 in a place subject to strong sunlight excessive dust mechanical vibration or periodic shocks Wall or Ceiling Mounting The DC 1 SERIES 2 has not been designed for mounting directly to walls or ceilings Ventilation Good air circulation is essential to prevent internal heat built up within the DC 1 SERIES 2 The DC 1 should be situated so that its position does not interfere with proper ventilation The DC 1 should not be placed in any situation that impedes the flow of air through the vents at the front and rear Do not place the DC 1 on a soft surface External Heat Sources The DC 1 SERIES 2 should be installed away from significant heat sources such as radiators and if possible away from other audio devices such as amplifiers that produce large amounts of heat Installation in racks with devices such as signal processors
18. dition The Emphasis bit is not set The DAC de emphasis will not be engaged 50 15 The Emphasis bit is set to 50 15 uS The DAC de emphasis will be engaged 17 AES EBU only The Emphasis bit is set to CCITT J17 The DAC de emphasis will not be engaged Unknown AES EBU only The Emphasis status is not indicated The DAC emphasis status will not be altered Sample Rate If no digital data error is detected the measured sample rate presented to the digital inputs will be displayed to the nearest 100Hz Illegal Checkbyte The RS232 or MIDI has received a command packet containing an illegal checkbyte byte2 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 29 Illegal Command Type The RS232 or MIDI has received a command packet containing an illegal command type byte4 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 30 NOTES AND HINTS TO USERS CEDAR Scratch removal is an almost foolproof process However there are rare instances when experience of its occasional quirks is useful These notes have been written by the in house Engineers at Cambridge Sound Restoration and should aid your quick progress to full understanding and competence Low thresholds are most effective at removing all classes of scratch click and tick However a higher threshold is advisable if processing begins to introduce distortion If distortion is introduced it will be most noticeable as a burbling sound rather than the traditional Jimi H
19. e incoming digital audio data You may select one of four error levels that will cause the front panel DIGITAL LED to flash if the incoming data contains an error equal to or worse than the selected level The error levels are 1 This is the weakest detector and will only cause the LED to flash when the DC 1 SERIES 2 believes that there is no usable signal being presented to the selected digital input 2 Code If there is an incoming signal yet the LED flashes on error level 2 the 1 SERIES 2 is indicating that the signal contains coding violations In some cases you may obtain usable audio However this warning may be caused by non AES EBU or non SP DIF data being presented In these cases any audio produced will almost certainly be unusable 3 Trans This indicates that the incoming digital audio data is of poor quality i e very noisy or jittery and that undetectable data errors are likely These errors will not be corrected by any standard AES EBU or SP DIF device and may lead to audio degradations 4 Valid This is the most stringent test of the incoming data and will cause the LED to flash if the DC 1 SERIES 2 determines that any of the data contained in the signal is not valid This is often non fatal i e you will hear perfectly good audio but it indicates that some device or anomaly in your audio chain is generating digital audio data outside of the AES EBU or SP DIF specificatio
20. e of whether you are Warmstarting or Coldstarting the DC 1 you should always allow a few seconds between switching the unit off and switching it on again DC 1 SERIES 2 Rev 02 Ver 3 06 Page 17 OPERATING THE CEDAR DC 1 SERIES 2 1 DEDICATED CONTROLS The DC 1 SERIES 2 features a number of dedicated controls to speed operation These are Dedicated Function Keys Bypass Page Pre Post Enter Level Controls Input Level Output Attenuation These are now explained in turn Bypass You may wish to bypass completely the operation of the DC 1 SERIES 2 Press BYPASS to do this The current status will be indicated on the Status LED The Bypass does not hard wire the input to the output Analogue signals still pass through the AtoD and DtoA stages Notes There is a delay of approximately 1 3mS in any analogue to analogue signal passed through the DC 1 SERIES 2 in Bypass mode e There is a delay of approximately 0 1mS in any digital to digital signal passed through the DC 1 SERIES 2 in Bypass mode e All delays are group delays i e are constant at all frequencies and are measured at a sample rate of 44 1kHz Page Use this Function Key to move between Pages Pre Post It will often be useful to compare the original signal with the post processing output of the DC 1 SERIES 2 The current status will be indicated on the Status LEDs Enter The ENTER Key has three functions as a LOCK OUT key preventi
21. endrix fuzz particularly following the transients of harsh sounds such as trumpets or synthesised brass To avoid this try raising the threshold a little In general no distortion will occur with a threshold of 8 or above When you select the Large Mode it will be necessary to use higher thresholds than typical for Small and Medium modes This is a consequence of the differences between the algorithms used in the modes In special cases noticeably high pitched high amplitude big band brass the descratch process will not totally de click without distortion CEDAR Audio now produce a dedicated unit the CEDAR CR 1 De Crackler to remove small ticks and crackles from material such as this In addition the CR 1 will remove crackles from all other types of material remove buzzes and reduce some forms of amplitude distortions There are also processes on the computer based CEDAR System which restore material suffering from crackle buzzes and distortion Please contact CEDAR Audio Ltd or your national distributor for details of this and other advanced CEDAR processes DC 1 SERIES 2 Rev 02 Ver 3 06 Page 31 REMOTE CONTROL PROTOCOLS 1 RS232 85232 is defined the DC 1 SERIES 2 as 9600 baud 8 bits data 1 stop bit No parity A command packet contains 6 bytes These are byte 1 channel number byte must be OxAF byte 2 Checkbyte Fixed must be 0x63 byte 3 command number see below byte 4 Command type Fixed 0x07 byte
22. he self test mode Switch on the DC 1 SERIES 2 while holding down the ENTER key The DC 1 will perform each test in turn and you may move to the next test by pressing the ENTER key Consequently any test may be skipped by pressing the ENTER key Note Whilst the SELF TEST is in progress the ENTER key will not initiate a MIDI DUMP ROUTINE 1 BUTTON TESTING ROUTINE The DC 1 SERIES 2 will invite you to press each of the Function Keys except ENTER and each of the Dedicated Function Keys Pressing a key will cause the display to change from OFF to ON ROUTINE 2 ATTENUATION KNOB TEST The DC 1 SERIES 2 will invite you to turn the Attenuation knob to check that the value displayed on screen matches the position of the knob ROUTINE 3 SPIN WHEEL TEST Rotate the spinwheel to check that values change smoothly in both positive clockwise and negative anti clockwise directions ROUTINE 4 LED TEST The DC 1 SERIES 2 will flash all six green LEDs ROUTINE 5 METER TEST The DC 1 SERIES 2 will invite you to turn the spinwheel to vary the levels displayed by each of the four input and output meters in turn Press ENTER to step to the next meter DC 1 SERIES 2 Rev 02 Ver 3 06 Page 35 ROUTINE 6 DSP1 TEST The DC 1 SERIES 2 will test its DSPs and internal memory Please wait for this test to complete If the System is fully functional the screen will display the message Memory passed If a memory error is detected
23. icks pops clicks crackle and thumps as well as genuine scratch like artefacts However when analysed carefully each of these degradations displays different sonic characteristics Therefore a single process attempting to remove all of these impulses would be an unacceptable compromise incapable of total repair of any single category These degradations can be separated into three categories thumps which includes loud pops scratches including ticks and clicks and crackle The DC 1 SERIES 2 has been designed to perform real time scratch removal The operation of the DC 1 is digital and any signal presented to the analogue inputs is internally converted to a suitable digital format by the integrated high quality analogue to digital converter ADC Following click removal the processed signal is converted back from digital format to analogue by the digital to analogue converter DAC For use with records films video and tape no other device offers the power facilities or accuracy of the DC 1 SERIES 2 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 4 SAFETY INSTRUCTIONS CAUTION 1 Read all of these instructions All safety and operating instructions should be read before the DC 1 SERIES 2 is operated Save these instructions for future reference Follow all warnings and instructions Water and Moisture The DC 1 SERIES 2 should not be used near water and must not be exposed to rain or moisture If the DC 1 is brought
24. lf test 35 servicing 6 Small 22 SMPTE EBU 27 SMPTE EBU 3 10 27 SP DIF 23 SP DIF 3 8 9 23 25 26 SP DIF Sync 25 SP DIF Sync options 25 Spinwheel 14 Status Indicators 14 Status Page 20 Status Page 28 SYNCHRONISATION 25 Threshold 17 threshold 21 thump 22 thumps 4 ticks 4 22 ticks 21 Timecode 27 34 timecode 3 10 Timed Out 29 TPDF 9 23 Trans 26 transients 31 Unknown 29 Valid 26 Ventilation 5 VITC 10 VU meters 3 Warmstart 17 34 XLR 9 23 Page 37 CEDAR 1 SERIES 2 Designed and Manufactured by CEDAR Audio Ltd 5 Glisson Road Cambridge CB1 2HA Tel amp Fax 44 0 223 464117 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 38
25. ng accidental changing of parameters as a CLEAR key resetting error messages and as a MIDI DUMP command These first two functions are of course context sensitive and the key s action will be appropriate to the page displayed see below The MIDI DUMP will be initiated every time that the ENTER key is pressed regardless of context DC 1 SERIES 2 Rev 02 Ver 3 06 Page 18 Input Level This control acts upon the analogue inputs only Use it to adjust the volume of incoming signals to the desired level We recommend a peak level of approximately 0 to 3dB as shown on the Input Signal Meters Output Attenuation Avoid clipping using the Output Attenuation Control This is not a compressor or limiter and acts purely as a digital gain control with variable gain from OdB to 10dB in 1dB steps DC 1 SERIES 2 Rev 02 Ver 3 06 Page 19 OPERATING THE CEDAR 1 SERIES 2 2 PAGES The DC 1 SERIES 2 has three pages which control all aspects of its operation Each page is displayed on the LCD screen and may be controlled using the Function Keys and the spinwheel Switch the DC 1 SERIES 2 on Refer first to the safety instructions The screen will immediately enter the CONTROL PAGE which will show the Warmstart parameters stored when the unit was last used All the controls for the DC 1 SERIES 2 are contained in the three PAGES each of which is selected by pressing the dedicated PAGE function key The Pages are cycled and
26. nit can be configured once and these parameters are then recalled on every power up This is ideal for applications where time consuming set ups at the start of each session are not practical Coldstart If the DC 1 SERIES 2 has not been used for some time the system will automatically Coldstart This process initialises all parameters to their factory default values and after a few seconds will automatically enter at Page 1 On start up the message Coldstart will be displayed at the top right of the start up screen on the LCD display The screen will then enter PAGE 1 which will show the default Parameters The default values are Threshold 10 Mode Medium Other default values are Digital Output AES EBU Input Source AES EBU Receiver Error Level 1 Lock MIDI Channel 1 Bypass OFF A to D frequency 44 1kHz Pre Post Post Warmstart The DC 1 SERIES 2 remembers the latest parameters used and the page that was active at the time that the system was last switched off On start up the DC 1 SERIES 2 will display the message Warmstart on the screen and after a few seconds will re enter at the appropriate page with all user parameters set to their previous values User Coldstart If you wish to force the DC 1 SERIES 2 to Coldstart hold down Function Key F1 while switching on the system Release F1 when the message Coldstart is seen on the LCD display Note In common with all other digital devices and irrespectiv
27. ns Please note however that if the digital LED does not flash this can not be taken as an absolute statement that the signal conforms to specification Note If the error level selected detects an error the digital audio signal will be coded as INVALID by the DC 1 SERIES 2 Many manufacturers devices do not recognise or act upon this code but those that do may refuse to accept or record the audio DC 1 SERIES 2 Rev 02 Ver 3 06 Page 26 PAGE 3 REMOTE CONTROL Access this page by repeatedly pressing the Dedicated Function Key PAGE until the REMOTE CONTROL PAGE appears The DC 1 SERIES 2 features intelligent auto detection software which monitors the RS232 MIDI and SMPTE EBU if fitted inputs and responds to data received on each and any of them This eliminates the need for a control to select the remote control to be used It is only necessary therefore to select the Channel on which the DC 1 SERIES 2 receives commands over MIDI MIDI CEDAR Audio Ltd do not produce software for remote devices to control the DC 1 SERIES 2 over MIDI MIDI CHANNEL Ensure that button A is highlighted by a box It is then possible to change the MIDI Channel turn the spinwheel clockwise to increase or anti clockwise to decrease the MIDI Channel To toggle this function on off press the Function Key marked On Coldstart the MIDI Channel defaults to 1 RS232 CEDAR Audio Ltd does not produce software for remote devices to cont
28. old x 100 A Left Threshold x 100 Small Medium Large Toggle Refresh Right Threshold x 100 A Right Threshold x 100 Page 33 2 The DC 1 is permanently set to transmit any change of control page parameters or Pre Post state via MIDI except when such a change is initiated by an RS232 or MIDI command Therefore if a MIDI sequencer such as Cubase Notator or EditTrack is connected to the DC 1 it will receive a running history of the unit s operation If your sequencer and audio sources are able to send and receive timecode then the DC 1 s MIDI capability may be used as the basis for an automation system Note The absolute parameter values are not transmitted or received so the user must ensure that any changes are relative to a desired starting value which can be set using MIDI DUMP If a MIDI DUMP of all control page parameters and the Pre Post state is required pressing ENTER at any time will initiate the DUMP Additional MIDI Command The DC 1 will receive LOCAL ON and LOCAL OFF commands The Status Page will notify you of the current state Both WARMSTART and COLDSTART always set LOCAL ON You can not initiate this command from the front panel of the DC 1 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 34 SELF TEST MODE The DC 1 SERIES 2 features a powerful self test mode which enables the System to check the operation of each of its major sub systems plus all of the user controls To enter t
29. onductor mono headphones with the DC 1 SERIES 2 Headphone Level Control Use this to adjust for a satisfactory listening level This level control will not alter the signal level at any of the rear panel outputs DC 1 SERIES 2 Rev 02 Ver 3 06 Page 14 10 11 12 13 Input Level Control This control acts upon the analogue inputs only Use it to adjust the volume of incoming analogue signals to the desired level A level of approximately 0 to 3dB as shown on the Input Signal Meters will offer best results The Input Level Control may be bypassed internally to obtain the best possible signal to noise ratio S N from the ADCs This work must be carried out by qualified service personnel so please refer to your authorised dealer or directly to CEDAR Audio to have this modification performed Output Attenuation Control A digital gain control with range 0 to 10dB in 1dB steps Function Keys Use along with the LCD screen Please refer to the following chapters for full instructions Contrast Control Adjusts the LCD screen for optimum visibility Use a fine screwdriver to make such adjustments DC 1 SERIES 2 Rev 02 Ver 3 06 Page 15 QUICK TOUR If you are impatient to hear some immediate results using your DC 1 SERIES 2 the following instructions should have you up and running within a few minutes 1 READ THE SAFETY INSTRUCTIONS 2 Connect the DC 1 SERIES 2 to the mains supply Connect your input and outp
30. or tape machines should not be a problem DC 1 SERIES 2 Rev 02 Ver 3 06 Page 5 9 Power Sources The DC 1 SERIES 2 features an auto switching power supply which will work safely on any mains supply in the ranges 95v 130v and 190v 260v 50Hz or 60Hz AC only You should never attempt to modify or adjust the internal power supply in any way It contains no user serviceable parts 10 Grounding or Polarisation The DC 1 SERIES 2 should always be grounded or earthed 11 Power Cord Protection Power connectors should be routed so that they will not be walked on or pinched 12 Extended Periods of Non Use The DC 1 SERIES 2 is not disconnected from the mains power as long as it is connected to the wall outlet even if the unit itself has been switched off Therefore if the DC 1 is not used for an extended period unplug the unit from the wall Pull the connector out by the plug never by the cord itself 13 Cleaning Clean only with a dry cloth NEVER use liquid cleaners such as alcohol or benzene on the DC 1 SERIES 2 NEVER use abrasive pads on the DC 1 14 Damage Requiring Service The DC 1 SERIES 2 should be returned to qualified service personnel when objects have fallen into the unit liquid has spilled into the unit the unit has been exposed to rain the unit fails to function or appears to operate abnormally the unit has been dropped or the case damaged 15 Servicing The user should not attempt to service the DC
31. press the Function Key marked C on the LCD screen The change in frequency will be shown on screen and by the Status LEDs Note The sampling frequency reverts to 44 1kHz on Coldstart EXTERNAL SYNCHRONISATION The DC 1 SERIES 2 clock may be synchronised to either the AES EBU input or the SP DIF input Connecting a valid digital input to either of these and selecting AES Sync or SP DIF Sync as appropriate will lock the DC 1 SERIES 2 to the external clock If the external clock falls within the acceptable ranges of each of the standard sample rates 44 1kHz 48kHz 32kHz the clock frequency will be shown on the LEDs If the external clock lies outside these ranges the DC 1 SERIES 2 will still function and good audio will be produced at the analogue output Whether the digital output will be usable will then be determined by the flexibility of other devices in the digital audio chain To toggle between AES Sync and SP DIF Sync options and between the DC 1s internal 44 1kHz and 48kHz sampling frequencies press the Function Key marked C on the LCD screen Note If external synchronisation is requested but no valid signal is detected at the appropriate digital input the DIGITAL LED will flash to indicate the error DC 1 SERIES 2 Rev 02 Ver 3 06 Page 25 D RECEIVER ERROR LEVEL INPUT SOURCE AES EBU or SP DIF The DC 1 SERIES 2 features sophisticated software which detects and analyses both fatal and non fatal errors in th
32. r exceeding that obtained using digital signal processors DSPs installed in desk top or larger computer systems excepting of course the CEDAR Production Systems The DC 1 SERIES 2 is designed for professional use although it will work perfectly well in a domestic environment and its features include the following The latest SERIES 2 CEDAR hardware Digital Audio interfaces conforming to the AES EBU and SP DIF standards 24 bit input and output resolution when using AES EBU interfaces Three sample rates supported on digital inputs 32kHz 44 1kHz and 48kHz Two sample rates supported on analogue inputs 44 1kHz and 48kHz Balanced analogue inputs and outputs for connection to professional analogue equipment ADC and DAC converters using the latest 64x over sampling gt Delta Sigma technology 2103dB dynamic range A D and gt 93dB dynamic range D A Mountable in a 19 EIA rack Remote control via MIDI and RS232 interfaces SMPTE EBU timecode capabilities via optional upgrade Input and output LED bar graph VU meters Twin 40 bit floating point DSP processors delivering 50MFlops to handle the most complex audio processing requirements High levels of artificial intelligence designed into DC 1 program algorithms making it extremely simple to use DC 1 SERIES 2 Rev 02 Ver 3 06 Page 3 THE BACKGROUND TO SCRATCH REMOVAL The term scratch describes many different audio phenomena t
33. rol the DC 1 SERIES 2 over RS232 However for users wishing to implement their own control software the RS232 Protocol is outlined the chapter RS232 Protocol SMPTE EBU Timecode A separate SMPTE EBU reader generator board may be purchased and fitted inside your DC 1 SERIES 2 Please contact your dealer for details of this DC 1 SERIES 2 Rev 02 Ver 3 06 Page 27 PAGE 4 STATUS PAGE Access the Status Page by holding down Function Key F5 and then pressing the Dedicated Function Key PAGE Should the DC 1 SERIES 2 fail to function or appear to function incorrectly there may be an error contained within the digital audio data received at the System s inputs The Receiver Error Level see above will notify you when an error has occurred but it will not tell you what it is For many users this information will be adequate but the DC 1 is capable of reporting errors and other status information in more detail The STATUS PAGE will give you information regarding the status of the DC 1 and will give you details regarding any errors that have occurred since the unit was switched on Three items of information will always be reported by the DC 1 SERIES 2 These are DSP1 Status Crashed Timed Out Running DSP2 Status Crashed Timed Out Running Condition Error Emphasis Sample Rate If a remote control error is detected a fourth field will appear Comms Error Illegal Checkbyte Illegal Command Size
34. s Page Bypass Level Pre Post Enter 4 O Q X CEDAR pecicer Dc 1 12 e A Phones Input Level Output Attenuation Firstly De Click your material O Bypass Page 40 58 2 TERET Pre Post Enter 4 8 O 2 52 CEDAR CR 1 gt Phones Input Level Output Attenuation Contrast SERIES 2 Next remove crackle and buzz and reduce distortion if appropriate Digita O w saia Power Bypass Page 19 Bypas as e N 5 e Level rore Pre Post Enter 4 2 CEDAR Azimuth corrector 21 12 Q SSS SS SS Phones Input Level Output Attenuation aln SERIES O Then apply Azimuth Correction to material with phase and balance problems ode Bypass Page 40 58 2 EREET Pre Post Enter 4 O CEDAR Phones Input Level Output Attenuation Contrast SERIES 2 O Finally apply noise reduction DC 1 SERIES 2 Rev 02 Ver 3 06 Page 13 LOCATION AND FUNCTION OF FRONT PANEL INDICATOR
35. the screen will display the message Memory error at If a DSP failure is detected the screen will display the message DSP1 is not responding If you observe this message please repeat the self test If the message recurs please contact your dealer for assistance WARNING The DC 1 SERIES 2 contains no user serviceable parts DO NOT UNDER ANY CIRCUMSTANCES attempt to service your unit ROUTINE 7 DSP2 TEST As above TEST COMPETED Your DC 1 SERIES 2 will now prompt you to press ENTER one more time to return you to operating mode whether all tests have been passed or not Some failures will not stop you from using the DC 1 SERIES 2 successfully However you should notify your dealer or CEDAR Audio Ltd if consistent failures DC 1 SERIES 2 Rev 02 Ver 3 06 Page 36 50 15 29 A to D frequency 17 ADC 3 4 AES Syne 25 AES EBU 23 AES EBU 3 8 9 16 23 25 26 29 analogue 3 8 Attenuation 19 Attenuation 15 automation 34 Azimuth Correction 12 balanced 9 blanking plates 7 buzzes 31 Bypass 14 17 18 CD 9 CEDAR Production Systems 3 Checkbyte 30 32 CLEAR 18 clicks 4 21 clicks 22 CLOCK 24 25 Code 26 coding violations 26 Coldstart 25 Coldstart 17 34 command packet 32 Command Type 30 32 command value HIGH byte 32 compressor 19 Contrast 15 CONTROL PAGE 20 CR 1 De Crackler 31 crackle 4 31 crackle 4 Crashed 29 DAC
36. ut devices to the DC 1 SERIES 2 using the appropriate input and output sockets If in doubt please refer to the section CONNECTING THE DC 1 SERIES 2 and the manuals of your other equipment 4 Hold down the function key F1 and switch on the DC 1 SERIES 2 5 i If you are using analogue inputs press PAGE once Press to select analogue Then press PAGE twice more to return to the Control Page 51 lf you are using digital inputs from a consumer format machine such as a domestic DAT recorder press PAGE once then press B twice to select SP DIF If you are outputting to a consumer format machine such a low cost DAT recorder press A to select SP DIF format Press PAGE twice to return to the Control Page Note The DC 1 SERIES 2 defaults to AES EBU PROFESSIONAL format so skip both instructions 4 i and 4 ii if your DC 1 SERIES 2 is connected to a system such as the Sony PCM1630 6 Play your material 7 Press PRE POST to hear an immediate difference between the processed and unprocessed signals assuming of course that your original material suffers from clicks and scratches This section should have whetted your appetite so you should now proceed to the rest of the manual to ensure that you can obtain the best results from your CEDAR DC 1 SERIES 2 DC 1 SERIES 2 Rev 02 Ver 3 06 Page 16 WARMSTART AND COLDSTART The DC 1 SERIES 2 features Warmstart and Coldstart options Warmstart has been added so that the u
37. will appear in the following order Control Page I O Control Page Remote Control Page These and a further description of the Dedicated Controls are now covered in turn Note There is a fourth normally hidden page called the Status Page This is not accessed using the standard function and will be discussed separately in the section describing Error Levels DC 1 SERIES 2 Rev 02 Ver 3 06 Page 20 1 Access this page by pressing the Defined Function Key PAGE repeatedly until the CONTROL PAGE appears Threshold Level This determines the size of scratch removed by the DC 1 A high threshold tells the system to remove only the largest clicks and scratches while a lower threshold also removes fine ticks and clicks WARNING If the threshold for a given piece of music is too low distortion of the genuine signal may result Typical thresholds to use are as follows Large scratch removal 20 Large click removal 15 Smaller click removal 8 Very small tick removal 5 Increase or decrease the threshold by turning the spinwheel clockwise or anticlockwise respectively To adjust the Channels individually At the bottom of the screen you will find three items of information These are the Left Threshold numeric value the Mode the Right Threshold numeric value You will note that both thresholds are surrounded by boxes This shows that they are SELECTED and
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