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Содержание CR-1 De-Crackler

Страница 1: ...DAR Professional Hardware Systems CR 1 De Crackler Digital Audio Restoration System SERIES 2 OWNER S MANUAL 1994 CEDAR Audio Ltd Written by Gordon Reid CR 1SERIES 2 Rev 02 Ver 3 06 Page 1 October 11 1995 ...

Страница 2: ...ons 8 Other Connections 10 SAMPLE INSTALLATION IDEAS 11 A GUIDE TO RESTORATION PROCESSING 12 FRONT PANEL INDICATORS AND CONTROLS 14 QUICK TOUR 16 WARMSTART AND COLDSTART 17 OPERATING THE CEDAR CR l SERIES 2 18 Dedicated Controls 18 PAGES 20 Control Page 21 Input Output Control Page 24 Remote Control 28 Status Page 29 Status Indicators 29 NOTES AND HINTS TO USERS REMOTE CONTROL PROTOCOLS 33 RS232 3...

Страница 3: ...P DIF standards 24 bit input and output resolution when using AES EBU interfaces Three sample rates supported on digital inputs 32kHz 44 1 kHz and 48kHz Two sample rates supported on analogue inputs 44 1 kHz and 48kHz Balanced analogue inputs and outputs for connection to professional analogue equipment ADC and DAC converters using the latest 64x over sampling 1 I Delta Sigma technology 103dB dyna...

Страница 4: ...hall refer to as simply crackle removal The operation of the CR 1 is totally digital and any signal presented to the analogue inputs is internally converted to a suitable digital format by the analogue to digital converter ADC Following crackle removal the processed signal is then converted back from digital format to analogue by the internal digital to analogue converter DAC For use with records ...

Страница 5: ...stand care should be taken when moved uneven surfaces or excessive force may cause cart and CR 1 to overturn Do not position the CR 1 in a place subject to strong sunlight excessive dust mechanical vibration or periodic shocks 6 Wall or Ceiling Mounting The CR 1 SERIES 2 has not been designed for mounting directly to walls or ceilings 7 Ventilation Good air circulation is essential to prevent inte...

Страница 6: ...erefore if the CR 1 is not to be used for an extended period of time 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 CR 1 SERIES 2 NEVER use abrasive pads on the CR 1 14 Damage Requiring Service The CR 1 SERIES 2 should be returned to qualified service perso...

Страница 7: ...ature should be maintained between 5 and 35 Centigrade 41 and 95 Fahrenheit Relative humidity should be in the range 30 to 60 non condensing Strong magnetic fields should not exist nearby 3 RACK MOUNTING The CR 1 SERIES 2can be mounted in a standard 19 EIA rack 4 FREE STANDING USE The CR 1 SERIES 2 can be used as a free standing unit The rack mount ears may then be replaced by the blanking plates ...

Страница 8: ...Inputs Outputs fuse holder I I LTC VITC t t t j j R IN L R OUT L IN LTC OUT IN VlTC OUT CAUTION POWER A O IA 0 RISK oc w 00 0 0 0 o o o A A AES IN SPOIF SPDIF OU AES IN OUT THRU I RS 232 INTERFACE 8 0 0 0 0 o 00 L J Digital 110 SP DIF I I I MIDI In OutlThru RS232 Interface Digital 110 AESIEBU ...

Страница 9: ...s 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 the best sound quality is obtained from your CR 1 For further information on grounding and polarity consult a perso...

Страница 10: ...he CR 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 ADCs 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 EB...

Страница 11: ...MIDI IN OUT THRU The operation of the CR 1 SERIES 2 may be controlled using the Musical Instrument Digital Interface MIDI Refer to the chapter on Remote Control Protocols for further instructions iii RS232 The CR 1 SERIES 2 may be controlled using the standard RS232 serial communications protocol Refer to the chapter on Remote Control Protocols for further instructions CR 1 SERIES 2 Rev 02 Ver 3 0...

Страница 12: ...or dignal in dignalout digital in RECORDER MIXER ellects return I I linen l CR 1 I AMP I 2 CR 1 SERIES 2 used on the effects loop within a studio environment anabgueor anabgue or analogue or analogue or di ilal in RECORDER line in AMP 3 CR 1 SERIES 2 used in line prior to an editor or audio workstation SOURCE line cui di itaI in di nal in d italoul SOURCE CR 1 CEDAR or other workstation editor CR ...

Страница 13: ...R 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 at a later time 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...

Страница 14: ...rial Next remove crackle and buzz and reduce distortion if appropriate Then apply Azimuth Correction to material with phase and balance problems Finally apply noise reduction CR 1SERIES 2 Rev 02 Ver 3 06 Page 13 October 10 1995 ...

Страница 15: ...ers output Signal Meters LCD Screen Status Indicators Defined Function Keys a dial Control Wheel Headphone Level Control o Headphones Socket CD Input Level Control Output Attenuation Control t t t t t Fl F2 F3 F4 FS I Function Contrast Keys Control ...

Страница 16: ...een Please refer to the following chapters for full instructions 5 Status Indicators Indicate the status of the analogue and digital inputs and whether the CR 1 SERIES 2 is in idle or processing modes Also indicate the possible causes should the unit fail to function 6 Dedicated Function Keys Certain functions are fundamental to operating the CR 1 SERIES 2 and these are controlled by the Dedicated...

Страница 17: ... SIN 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 11 Output Attenuation Control A digital gain control with range 0 to 1 OdB in 1dB steps 12 Function Keys Use along with the LCD screen Please refer to the following chapters for full instructions 13 Contrast Control...

Страница 18: ... inputs from a consumer format machine such as a domestic OAT recorder press PAGE once then press B twice to select SP OIF If you are outputting to a consumer format machine such as a low cost OAT recorder press A to select SP OIF format Press PAGE twice to return to the Control Page Note The CR 1 SERIES 2 defaults to AESIEBU PROFESSIONAL format so skip both instructions 5 i and 5 ii if your CR 1 ...

Страница 19: ...shold 8 Mode Crackle1 Other default values are Digital Output AES EBU Input Source AES EBU Receiver Error Level 1 Lock MIDI Channel 1 Bypass OFF A to 0 frequency 44 1 kHz Pre Post Post Warmstart The CR 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 CR 1 SERIES 2 will display the message Warmstart on the...

Страница 20: ...elay of approximately O 1mS in any digital to digital signal passed through the CR 1 SERIES 2 in Bypass mode 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 CR 1 SERIES 2 The current stat...

Страница 21: ...ecommend a peak level of approximately ato 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 OdS to 10dB in 1dB steps CR 1 SERIES 2 Rev 02 Ver 3 06 Page 19 October 10 1995 ...

Страница 22: ...nit was last used All the controls for the CR 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 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 call...

Страница 23: ...ng the de crackle and Recombine algorithms Press the Function Key under the word MODE to toggle between the Mode settings Detect level Split This determines the degree to which the Splitter divides the input signal into genuine signal and crackle distortion To adjust the Detect Level Set the Mode to Detector The CR 1 will now output the Split signal bypassing the de crackling and recombining algor...

Страница 24: ...ombine This determines the amount of crackle removed by the CR 1 A high threshold tells the system to remove only the most obvious crackles and buzzes while a lower threshold also removes fine crackle buzz and distortion WARNING If the threshold for a given piece of music is too low distortion of the genuine signal may result Typical crackle removal thresholds are 4 or 5 To increase or decrease th...

Страница 25: ...he action of the a dial applies to both channels To de select a control and to re select it as desired press the Function Key immediately below the read out The box will disappear showing that the control is now DE SELECTED If all controls are de selected the a dial will have no effect CR 1 SERIES 2 Rev 02 Ver 3 06 Page 23 October 10 1995 ...

Страница 26: ...e 1 0 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 CR 1 SERIES 2 features 24...

Страница 27: ...gnal presented to inputs 44 1 kHz LED lit 44 1 kHz signal presented to inputs 48 kHz LED lit 48kHz signal presented to inputs CLOCK DETECTION If the CR 1 SERIES 2 fails to detect a digital signal within the following limits the 44 1 kHz 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 CONV...

Страница 28: ...o either of these and selecting AES Sync or SP OIF Sync as appropriate will lock the CR 1 SERIES 2 to the external clock If the external clock falls within the acceptable ranges of each of the standard sample rates 44 1 kHz 48kHz 32kHz the clock frequency will be shown on the LEOs If the external clock lies outside these ranges the CR 1 SERIES 2 will still function and good audio will be produced ...

Страница 29: ... 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 CR 1 SERIES 2 determines that any of the data ...

Страница 30: ...the CR 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 a dial clockwise to increase or anti clockwise to decrease the MIDI Channel To toggle this function on off press the Function Key marked A On Coldstart the MIDI Channel defaults to 1 RS232 CEDAR Audio Ltd do not produce software for remote devices to control...

Страница 31: ... any errors which have occurred since the unit was switched on Three items of information will always be reported by the CR 1 SERIES 2 These are DSP1 Status Crashed Timed Out Running DSP2 Status Crashed Timed Out Running I O Condition Error Emphasis Sample Rate If an remote control error is detected a fourth field will appear Comms Error Illegal Checkbyte Illegal Command Size STATUS INDICATORS The...

Страница 32: ... CR 1 SERIES 2 DSPs are functioning correctly and moreover have been doing so since the unit was switched on If the DIGITAL LED is flashing the most serious error will be detailed at this point Errors are fully detailed in the CR 1 SERIES 2 Service Manual If no error is detected the I O status will display the Emphasis condition OFF The Emphasis bit is not set The DAC de emphasis will not be engag...

Страница 33: ...Illegal Command Type The RS232 or MIDI has received a command packet containing an illegal command type byte4 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 31 October 10 1995 ...

Страница 34: ...he signal is smooth and contains no residual crackle All side effects should be ignored at this stage Switching to the Crackle1 or Crackle2 modes will eliminate the side effects of the Detector Low Thresholds 4 or 5 are most effective at removing all classes of crackle buzz and distortion However a higher threshold is advisable if processing begins to introduce unwanted side effects In general no ...

Страница 35: ... together form a signed integer Command Numbers Command Values OxF7 Clear Errors command Any value OxF8 Select Page command 1 OxF9 Pre Post command OxFA Bypass command 6 7 15 1 Any other value 0 1 1 Any other value 0 1 2 3 1 Any other value OxCO Digital Output Format Ox80 OxOO 1 Any other value CR l SERIES 2 Rev 02 Ver 3 06 October 10 1995 Clear all error messages Control Page I O Control Page Sta...

Страница 36: ...ft Threshold Any value Ox23 Set Right Threshold Any value Ox33 Alter Right Threshold Any value Ox24 Mode 0 1 2 1 Any other value CR 1 SERIES 2 Rev 02 Ver 3 06 October 10 1995 Analogue SP DIF AES EBU Toggle Refresh 44 1 kHz 48kHz SP DIF Sync AES EBU Sync Toggle Refresh 1 Lock 2 Code 3 Trans 4 Valid Toggle Refresh Left Detect x 100 Left Detect x 100 Right Detect x 100 Right Detect x 100 Left Thresho...

Страница 37: ...s 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 CR 1 will receive LOCA...

Страница 38: ...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 CR 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 a dial SPIN WHEEL TEST Rotate the a dial to check that values change s...

Страница 39: ...peat the self test If the message recurs please contact your dealer for assistance WARNING The CR 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 CR 1 SERIES 2 wi 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...

Страница 40: ... ERROR LEVEL 27 29 Error Levels 20 external clock 26 Function Keys 14 15 18 20 Grounding 6 grungy 21 Headphone 14 Heat 5 hiss 32 HISS l 12 HISS 212 humidity 7 1 018 24 I O Control Page 20 input 8 14 24 25 Input Level 15 18 19 Input Source 17 J1730 LCD Screen 14 limiter 19 LOCAL OFF 35 LOCAL ON 35 Lock 27 lock out 18 LTC 10 magnetic fields 7 Memory 37 meters 36 MIDI 3 10 17 28 35 MIDI Channel 28 MI...

Страница 41: ...CEDAR CR 1 SERIES 2 Designed and Manufactured by CEDAR Audio Ltd 5 Glisson Road Cambridge CB12HA Tel Fax 44 0 223 464117 CR 1SERIES 2 Rev 02 Ver 3 06 Page 39 October 10 1995 ...

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