cedar cr-1 series 2
Contents
1. When the CR 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 CR 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 CR 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 CR 1 SERIES 2 do not offer a 32kHz option unless synchronised to an external 32kHz source CR 1 SERIES 2 Rev 02 Ver 3 06 Page 25 November 30 2005 C 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 e INTERNAL CLOCK FREQUENCIES To toggle between the CR 1s internal 44 1kHz and 48kHz sampling frequencies and between AES Sync and SP DIF Sync see b2. CEDAR Professional Hardware Systems CR 1 De Crackler Digital Audio Restoration System SERIES 2 Digita O Ove pm mm Over Geer Bypass Page Power KI 0dB 48kHz yp ge EEN o da SS e a 1 pre e O z me Post Level E Lech Past Pre Post Enter o A O Gye CEDAR pe Crackler CHA S i ked ENN O mron a CA E ez O me lietcs SERIES 2 O OWNER S MANUAL 1994 CEDAR Audio Ltd Written by Gordon Reid CR 1 SERIES 2 Rev 02 Ver 3 06 Page 1 November 30 2005 TABLE OF CONTENTS TABLE OF CONTENTS INTRODUCTION THE BACKGROUND TO CRACKLE REMOVAL SAFETY INSTRUCTIONS SET UP Unpacking and Inspection Installation site Rack Mounting Free Standing use CONNECTIONS Before Connection Power Connections Signal Lead Connections Other Connections SAMPLE INSTALLATION IDEAS A GUIDE TO RESTORATION PROCESSING FRONT PANEL INDICATORS AND CONTROLS QUICK TOUR WARMSTART AND COLDSTART OPERATING THE CEDAR CR 1 SERIES 2 Dedicated Controls PAGES Control Page Input Output Control Page Remote Control Status Page Status Indicators NOTES AND HINTS TO USERS REMOTE CONTROL PROTOCOLS RS232 MIDI SELF TEST MODE CR 1 SERIES 2 Rev 02 Ver 3 06 November 30 2005 Page 2 COMO OO OO NNNNNORARA ON INTRODUCTION Thank you for purchasing the CEDAR CR 1 De Crackler The original CR 1 was the
3. Any other value CR 1 SERIES 2 Rev 02 Ver 3 06 November 30 2005 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 Detect x 100 A Left Detect x 100 Right Detect x 100 A Right Detect x 100 Left Threshold x 100 A Left Threshold x 100 Right Threshold x 100 A Right Threshold x 100 Detect Crackle Crackle2 Toggle Refresh Page 34 2 MIDI The CR 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 CR 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 CR 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 CR 1 will receive LOCAL ON and LOCAL OFF commands The Status Page will notify you of the current state Both WARMST
4. DIF specifications published by their respective bodies 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 CR 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 27 November 30 2005 PAGE 3 REMOTE CONTROL Access this page by repeatedly pressing the Dedicated Function Key PAGE until the REMOTE CONTROL PAGE appears The CR 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 CR 1 SERIES 2 receives commands over MIDI MIDI CEDAR Audio Ltd do not produce software for remote devices to control the CR 1 SERIES 2 over MIDI e MIDI CHANNEL Ensure that button A is highlighted by a box It is then possible to change the MIDI Channel turn the 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 R
5. SS SS O Phones Input Level Output Attenuation GE SERIES O Then apply Azimuth Correction to material with phase and balance problems O oB se 10 8 S a atl fee ee ee g p D Pre Post Enter 4 8 O e CEDAR be isser eu he lt SSS Se O Phones Input Level Output Attenuation Contrast SERIES 2 O Finally apply noise reduction CR 1 SERIES 2 Rev 02 Ver 3 06 Page 13 November 30 2005 LOCATION AND FUNCTION OF FRONT PANEL INDICATORS AND CONTROLS Refer to the Front Panel diagram 1 Power Switch 2 Input Signal Meters Left and Right Digital signal meters display the peak value of the selected input in dBOs The Over indicators will light if the input signal remains at full scale for four or more consecutive samples 3 Output Signal Meters Left and Right Calibrated signal meters display the RMS value of all output signals The Over indicators will light if the output signal remains at full scale for four or more consecutive samples 4 LCD Screen Provides you with a variety of information and messages keeping you aware of what is currently happening in the CR 1 SERIES 2 All the control screens of the CR 1 SERIES 2 are displayed on the LCD screen Please refer to the following chapters for full instructions 5 Status Indicators Indicate the sta
6. 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 CR 1 SERIES 2 used in line prior to an editor or audio workstation CR 1 SERIES 2 Rev 02 Ver 3 06 Page 11 November 30 2005 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 final 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 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 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 eithe
7. detailed in the CR 1 SERIES 2 Service Manual Emphasis 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 engaged 50 15 The Emphasis bit is set to 50 15 S The DAC de emphasis will be engaged J17 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 30 November 30 2005 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 November 30 2005 NOTES AND HINTS TO USERS CEDAR Crackle 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 IMPORTANT The CR 1 will only function correctly if there are no major ticks or clicks received at the input The CR 1 IS
8. 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 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 Any value Clear all error messages OxF8 Select Page command 1 Control Page 6 _ I O Control Page 7 Status Page 15 Remote Control Page Toggle between Pages Any other value Refresh OxF9 Pre Post command O 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 OxCO Digital Output Format 0x80 SP DIF 0x00 AES EBU 1 Toggle Any other value Refresh CR 1 SERIES 2 Rev 02 Ver 3 06 Page 33 November 30 2005 OxC1 OxC2 OxC3 0x20 0x30 0x21 0x31 0x22 0x32 0x23 0x33 0x24 Input Source 0 1 2 1 Any other value A to D Frequency 0 1 2 3 1 Any other value Receiver Error Level 0 1 2 3 1 Any other value Set Left Detect Any value Alter Left Detect Any value Set Right Detect Any value Alter Right Detect Any value Set Left Threshold Any value Alter Left Threshold Any value Set Right Threshold Any value Alter Right Threshold Any value Mode 0 1 2 1
9. the lowest detect level which audibly removes all the crackle distortion from the monitored signal WARNING Ifthe Detect Level for a given piece of music is set too high distortion of the genuine signal may result after Recombination CR 1 SERIES 2 Rev 02 Ver 3 06 Page 21 November 30 2005 Typical Detect Levels are as follows Very light crackle and distortion 20 Vinyl crackles and heavier distortion 50 Severe vinyl crackles 50 78 rpm crackles 50 Extreme cases cylinders etc 50 To increase or decrease the Detect Level Enable the Left and Right Detect Level controls by pressing the F1 and F2 function keys When the levels are highlighted by a box the controls are active e To increase or decrease the Detect Levels turn the dial clockwise or anticlockwise respectively Note Some tracks exhibit widely fluctuating levels of crackle Consequently experienced users may choose to vary the Detect Level during processing This has no harmful side effects and may benefit the quality of the final output Threshold Level Recombine 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 inc
10. 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 person familiar with studio grounding techniques 3 SIGNAL LEAD CONNECTIONS Refer to the Rear Panel diagram The CR 1 SERIES 2 offers three audio connection standards one analogue and two digital These are e balanced analogue audio UO e digital SP DIF format audio data e digital AES EBU format audio data Note that the CR 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 8 November 30 2005 i Balanced analogue audio I O Pin 2 hot This standard is used in professional audio equipment Connect the output from your source to the balanced analogue inputs of the CR 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 CR 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 pr
11. 1 program algorithms making it extremely simple to use CR 1 SERIES 2 Rev 02 Ver 3 06 Page 3 November 30 2005 THE BACKGROUND TO CRACKLE REMOVAL The term crackle is often used to describe many different audio phenomena low level high density ticks surface noise buzz and some forms of amplitude distortion Fortunately these degradations exhibit quite similar audio characteristics and we have found that a single process the unique CEDAR Split A Recombine is capable of removing crackle removing buzz and significantly reducing many instances of distortion The CR 1 has been designed to perform real time crackle removal buzz removal and distortion reduction which for the remainder of this manual we shall 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 films video and tape no other device offers the power facilities or accuracy of the CR 1 SERIES 2 2 Distortion comes in two families amplitude based distortions and time based distortions Examples of the former are microphone diaphragm grounding and overdriven mixer inputs examples of the latter include tap
12. ART and COLDSTART always set LOCAL ON This command cannot be initiated from the front panel of the CR 1 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 35 November 30 2005 SELF TEST MODE The CR 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 the self test mode Switch on the CR 1 SERIES 2 while holding down the ENTER key The CR 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 CR 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 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 dial SPIN WHEEL TEST Rotate the dial to check that values change smoothly in both positive clockwise and negative anti clockwise directions ROUTINE 4 LED TEST The CR 1 SERIES 2 will flash all six green LEDs ROUTINE 5 METER TEST The CR 1 SERIES 2 will invite you to turn the dial to vary the levels displayed by each of the four in
13. NOT a de clicker and will not give satisfactory results when used as such If clicks exist on your material they must be removed by the CEDAR DC 1 or Module 1 of the CEDAR Production System before the CR 1 will give best results e Always set the Detect Level before adjusting the Threshold The detector should be adjusted such that the signal is smooth and contains no residual crackle All side effects should be ignored at this stage e Switching to the Crackle1 or Crackle2 modes will eliminate the side effects of the Detector e 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 distortion will be introduced with a threshold of 8 or above e When the Crackle2 Mode is selected it may be necessary to use higher thresholds than typical for the Crackle1 mode This is a consequence of the differences between the algorithms used in the modes There are also processes on the computer based CEDAR System which restore material suffering from scratches clicks hiss and other broadband noises Please contact CEDAR Audio Ltd or your national distributor for details of this and other advanced CEDAR processes CR 1 SERIES 2 Rev 02 Ver 3 06 Page 32 November 30 2005 REMOTE CONTROL PROTOCOLS 1 RS232 RS232 is defined in the CR 1 SERIES 2 as 9600 baud 8 bits data 1 stop bit No
14. S232 CEDAR Audio Ltd do not produce software for remote devices to control the CR 1 SERIES 2 over RS232 However for users wishing to implement their own control software the RS232 Protocol is outlined in the chapter RS232 Protocol SMPTE EBU Timecode A separate SMPTE EBU reader generator board may be purchased and fitted inside your CR 1 SERIES 2 Please contact your dealer for details of this CR 1 SERIES 2 Rev 02 Ver 3 06 Page 28 November 30 2005 PAGE 4 STATUS PAGE Access the Status Page by holding down Function Key F5 and then pressing the Dedicated Function Key PAGE Should the CR 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 CR 1 is capable of reporting errors and other status information in more detail The STATUS PAGE will give you information regarding the current status of the CR 1 and will give you details regarding 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 e DSP1 Status Crashed Timed Out Running e DSP2 Status Crashed Timed Out Running I O Condition Error Emphasis Sample Rate If an remote control error i
15. aning 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 personnel when objects have fallen into the unit e liquid has been spilled into the unit e the unit has been exposed to rain e the unit fails to function or appears to operate abnormally e the unit has been dropped or the case damaged 15 Servicing The user should not attempt to service the CR 1 SERIES 2 beyond the instructions contained in the User s Manual All other servicing should be referred to qualified service personnel CR 1 SERIES 2 Rev 02 Ver 3 06 Page 6 November 30 2005 SET UP 1 UNPACKING AND INSPECTION Be careful not to damage the CR 1 SERIES 2 during unpacking Save the carton and all packing materials since you may need them to transport the CR 1 SERIES 2 in the future In addition to the packaging the carton should contain the following e mains connection lead e this manual e two blanking plates 2 INSTALLATION SITE The CR 1 SERIES 2 may be used in most areas but to maintain reliability and prolong operating life observe the following environmental considerations e 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 e Strong magnetic fields should not exist n
16. antly from well defined crackles or from more grungy artefacts The Mode parameter enables you to select the more appropriate setting for each restoration Crackle Use this setting when the damage is predominantly well defined crackle Crackle2 Use this setting when the material suffers from more grungy crackle or when a low pass filter has been used to dull the original sound The Mode control also enables you to monitor the output from the Split algorithm This is necessary to correctly set up the CR 1 and obtain the best results from any given recording Detector Monitor the output from the Splitter bypassing 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 e Set the Mode to Detector The CR 1 will now output the Split signal bypassing the de crackling and recombining algorithms Adjust the Detect Level until you find the lowest level at which the signal sounds smooth and all the crackle has disappeared The audio will show many side effects at this stage bubbliness or an under water effect being the most common Do not worry This is a necessary consequence of the Splitter routine and will not mar the final output For best results find
17. both fatal and non fatal errors in the incoming digital audio data You may select one of four error levels which 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 Lock This is the weakest detector and will only cause the LED to flash when the CR 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 CR 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 CR 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
18. ce AES EBU Receiver Error Level 1 Lock MIDI Channel 1 Bypass OFF A to D frequency 44 1kHz 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 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 CR 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 irrespective of whether you are Warmstarting or Coldstarting the CR 1 you should always allow a few seconds between switching the unit off and switching it on again CR 1 SERIES 2 Rev 02 Ver 3 06 Page 17 November 30 2005 OPERATING THE CEDAR CR 1 SERIES 2 1 DEDICATED CONTROLS The CR 1 SERIES 2 features a number of dedicated controls to speed operation These are Dedicated Function Keys e Bypass e Page e Pre Post e Enter UO Level Controls e Input Level Output Attenuation These are now explained in turn Bypass You may wish to bypass completely the operation of the CR 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 out
19. d 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 The LCD screen may be adjusted for optimum visibility Use a fine screwdriver to make such adjustments CR 1 SERIES 2 Rev 02 Ver 3 06 Page 15 November 30 2005 QUICK TOUR If you are impatient to hear some immediate results using your CR 1 SERIES 2 the following instructions should have you up and running within a few minutes 1 2 gl 5 ii READ THE SAFETY INSTRUCTIONS Connect the CR 1 SERIES 2 to the mains supply Connect your input and output devices to the CR 1 SERIES 2 using the appropriate input and output sockets If in doubt please refer to the section CONNECTING THE CR 1 SERIES 2 and the manuals of your other equipment Hold down the function key F1 and switch on the CR 1 SERIES 2 If you are using analogue inputs press PAGE once Press B to select analogue Then press PAGE twice more to return to the Control Page If 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 as a low cost DAT recorder press A to select SP DIF format Press PAGE twice to return to the Control Page Note The CR 1 SERIES 2 defaults to AES EBU PROFESSIONAL
20. e over modulation and compression CR 1 SERIES 2 Rev 02 Ver 3 06 Page 4 November 30 2005 SAFETY INSTRUCTIONS CAUTION 1 Read all of these instructions All safety and operating instructions should be read before the CR 1 SERIES 2 is operated Save these instructions for future reference Follow all warnings and instructions Water and Moisture The CR 1 SERIES 2 should not be used near water and must not be exposed to rain or moisture If the CR 1 is brought directly from a cold environment into a warm one moisture may condense inside the unit This in itself will not damage the CR 1 but may cause hazardous electrical shorting to occur This could severely damage the CR 1 and even cause danger to life ALWAYS allow time for the CR 1 to naturally reach ambient temperatures before connecting the mains power Mounting The CR 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 CR 1 to overturn Do not position the CR 1 in a place subject to strong sunlight excessive dust mechanical vibration or periodic shocks Wall or Ceiling Mounting The CR 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 CR 1 SERIES 2 The CR 1 should be situated so tha
21. e 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 CR 1 SERIES 2 features 24 bit input and output resolution when AES EBU is selected e 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 24 November 30 2005 B 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 DIGITAL SIGNAL
22. earby 3 RACK MOUNTING The CR 1 SERIES 2 can 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 if desired To replace the ears with the blanking plates e Unscrew the three bolts which attach each ear to the chassis of the CR 1 Attach the blanking plates using the same retaining bolts Do not over tighten these bolts as doing so may cause damage to the CR 1 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 7 November 30 2005 CONNECTIONS The CR 1 SERIES 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 e To prevent problems and possible equipment damage turn off the power to all equipment before making connections e 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 CR 1 SERIES 2 is switched OFF before inserting the mains lead NOTE Users with 2 pin mains supplies When the CR 1 SERIES 2 is connected to other audio components the AC hum of the unit may be increased or decreased by reversing
23. elow press the Function Key marked C on the LCD screen The change in frequency will be shown on screen and also by the Status LEDs Note The sampling frequency reverts to 44 1kHz on Coldstart e EXTERNAL SYNCHRONISATION The CR 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 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 1kHz 48kHz 32kHz the clock frequency will be shown on the LEDs If the external clock lies outside these ranges the CR 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 also between the CR 1s internal 44 1kKHz 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 26 November 30 2005 D RECEIVER ERROR LEVEL INPUT SOURCE AES EBU or SP DIF The CR 1 SERIES 2 features sophisticated software which detects and analyses
24. essor or limiter and acts purely as a digital gain control with variable gain from OdB to 10dB in 1dB steps CR 1 SERIES 2 Rev 02 Ver 3 06 Page 19 November 30 2005 OPERATING THE CEDAR CR 1 SERIES 2 2 PAGES The CR 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 dal Switch the CR 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 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 e Control Page e UO Control Page e 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 Page function and will be discussed separately in the section describing Error Levels CR 1 SERIES 2 Rev 02 Ver 3 06 Page 20 November 30 2005 PAGE 1 CONTROL PAGE Access this page by pressing the Defined Function Key PAGE repeatedly until the CONTROL PAGE appears Mode The CEDAR CR 1 can optimise its crackle removal depending on whether the material being processed suffers predomin
25. format so skip both instructions 5 i and 5 ii if your CR 1 SERIES 2 is connected to a system such as the Sony PCM1630 Play your material Press PRE POST to hear an immediate difference between the processed and unprocessed signals assuming of course that your original material suffers from crackle buzz and or distortion 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 CR 1 SERIES 2 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 16 November 30 2005 WARMSTART AND COLDSTART The CR 1 SERIES 2 features Warmstart and Coldstart options Warmstart has been added so that the unit can be configured once and these parameters are then automatically 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 CR 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 Detect 0 Threshold 8 Mode Crackle1 Other default values are Digital Output AES EBU Input Sour
26. hase EX 12 phono 24 polarity 8 Power connectors 6 power supply 6 Pre Post 14 16 17 18 Receiver Error Level 17 remote control 28 Remote Control Page 20 resolution 9 RMS 14 RS232 3 10 28 33 RS232 Protocol 28 Running 30 sample rate 3 25 30 sampling frequency 24 scratches 32 self test 36 servicing 6 SMPTE EBU 3 10 28 SP DIF 3 8 9 24 26 27 SP DIF Sync 26 SP DIF Sync options 26 Spinwheel 14 Split amp Recombine 4 Splitter 21 Status Indicators 14 Status Page 20 29 surface noise 4 SYNCHRONISATION 26 Threshold 17 22 32 Threshold Level 22 ticks 4 timecode 3 10 28 35 Timed Out 30 TPDF 9 24 Trans 27 Unknown 30 Valid 27 Ventilation 5 VITC 10 VU meters 3 Warmstart 17 35 XLR 9 24 A gt 3 Page 38 CEDAR CR 1 SERIES 2 Designed and Manufactured by CEDAR Audio Ltd 5 Glisson Road Cambridge CB1 2HA Tel amp Fax 44 0 223 464117 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 39 November 30 2005
27. ion 15 19 automation 35 Azimuth Correction 12 balanced 9 blanking plates 7 buzz 4 Bypass 14 17 18 CD9 CEDAR DC 1 32 CEDAR Production Systems 3 Checkbyte 30 33 CLEAR 18 clicks 32 Clock 25 26 Code 27 coding violations 27 Coldstart 17 26 35 command packet 33 Command Type 31 33 command value HIGH byte 33 compressor 19 Contrast 15 CONTROL PAGE 20 crackle 4 22 Crackle1 21 32 Crackle2 21 32 Crashed 30 DAC 3 4 DASH 9 DAT 9 16 de clicker 32 De Clicking 12 De Crackling 12 De Hissing 12 De Scratching 12 default values 17 Detect 17 Detect Level 21 22 32 Detector 21 DH 1 12 digital 8 CR 1 SERIES 2 Rev 02 Ver 3 06 November 30 2005 Digital Output 17 digital signal processors 3 distortion 22 Dithering 9 24 DSP 30 37 dynamic range 3 EIA rack 3 5 7 Emphasis 30 Enter 14 18 35 Error 30 error detection 24 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 1 12 HISS 2 12 humidity 7 I O 18 24 I O Control Page 20 input 8 14 24 25 Input Level 15 18 19 Input Source 17 J17 30 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 MIDI DUMP 18 35 Mode 17 21 22 output 8 9 14 19 Output Attenuation 18 output format 24 Over 14 Page 14 18 peak 14 P
28. ofessional 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 CR 1 SERIES 2 using a single cable terminated with RCA or phono plugs The SP DIF output of the 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 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 CR 1 SERIES 2 using a single cable terminated with XLR plugs The AES EBU output of the CR 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 CR 1 SERIES 2 features 24 bit input and output resolution whenever the AES EBU digital input and output are utilised Dithering The CR 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 9 November 30 2005 In order to comply with EMC regulations this uni
29. put Analogue signals still pass through the AtoD and DtoA stages Notes e There is a delay of approximately 1 3mS in any analogue to analogue signal passed through the CR 1 SERIES 2 in Bypass mode e There is a delay of approximately 0 1mS in any digital to digital signal passed through the CR 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 CR 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 preventing 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 18 November 30 2005 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 compr
30. put and output meters in turn Press ENTER to step to the next meter CR 1 SERIES 2 Rev 02 Ver 3 06 Page 36 November 30 2005 ROUTINE 6 DSP1 TEST The CR 1 SERIES 2 will test its DSPs and internal memory Please wait for this test to complete e If the System is fully functional the screen will display the message Memory passed e If a memory error is detected the screen will display the message Memory error at e 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 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 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 CR 1 SERIES 2 successfully However consistent failures should be notified to your dealer or directly to CEDAR Audio Ltd CR 1 SERIES 2 Rev 02 Ver 3 06 Page 37 November 30 2005 16 bit 24 24 bit 3 9 24 32kHz 3 25 26 44 1kHz 3 25 26 A8kHz 3 25 26 50 15 30 A to D frequency 17 a dial 14 20 ADC 3 4 AES Sync 26 AES EBU 3 8 9 16 24 26 27 30 amplitude distortion 4 analogue 3 8 Attenuat
31. r 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 12 November 30 2005 Digital O Parry Power Se Bypass Page Bypass S Si Level Ge Pre Post Enter 4 8 O Gye CEDAR ve ciicker Dc 1 PCK 12 e A O Phones Input Level Output Attenuation Som ZE O Firstly De Click your material O ode SC Bypass Page 10 SS 2 S Ra TESEI Pre Post Enter 4 8 O GI Ke CEDAR Ge Grackier CR 1 G e SE O Phones Input Level Output Attenuation Contrast SERIES 2 O Next remove crackle and buzz and reduce distortion if appropriate Dag O w saia Power op EE Bypass Page GG Bypas asi e d N S re Level oe Pre Post Enter 4 8 A Gye CEDAR Azimuth corrector Az 1 o 12 Q SSS
32. rease or decrease the Threshold Level Enable the Left and Right Threshold controls by pressing the F4 and F5 function keys When the levels are highlighted by a box the controls are active e To increase or decrease the Thresholds turn the dial clockwise or anticlockwise respectively CR 1 SERIES 2 Rev 02 Ver 3 06 Page 22 November 30 2005 To adjust the Channels individually At the bottom of the screen you will find five items of information These are e the Left and Right Detect Levels numeric value e the Mode e the Left and Right Thresholds numeric value You will note that in normal use both Detect Levels or both Thresholds are surrounded by boxes This shows that they are SELECTED and that the action of the 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 dial will have no effect CR 1 SERIES 2 Rev 02 Ver 3 06 Page 23 November 30 2005 PAGE 2 INPUT OUTPUT CONTROL PAGE I O CONTROL Access this page by pressing the Dedicated Function Key PAGE repeatedly until the I O 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 Remember that all outputs ar
33. s detected a fourth field will appear e Comms Error Illegal Checkbyte Illegal Command Size 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 29 November 30 2005 STATUS PAGE DEFINITIONS Crashed The CR 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 CR 1 SERIES 2 to an authorised service centre Timed Out If for any reason the CR 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 CR 1 SERIES 2 should continue to function normally after it has occurred Running The CR 1 SERIES 2 DSPs are functioning correctly and moreover 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
34. t its position does not interfere with proper ventilation The CR 1 should not be placed in any situation which impedes the flow of air through the vents at the front and rear Do not place the CR 1 on a soft surface External Heat Sources The CR 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 or tape machines should not be a problem CR 1 SERIES 2 Rev 02 Ver 3 06 Page 5 November 30 2005 9 Power Sources The CR 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 CR 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 CR 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 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 Cle
35. t 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 CR 1 SERIES 2 The standard CR 1 SERIES 2 does not support timecode and these connectors are not present ii 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 06 Page 10 November 30 2005 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 CR 1 SERIES 2 used in line for transcription or broadcast purposes f analogue or analogue or analogue or line out digital in digital out digital in RECORDER effects send effects return SOURCE 2 CR 1 SERIES 2 used on the effects loop within a studio environment
36. tus 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 function keys Bypass Page Pre Post and Enter 7 dial Spinwheel The dial enables you to increase and decrease control values Please refer to the following chapters for full instructions 8 Headphone Socket For use with stereo headphones only Accepts a standard 1 4 stereo jack plug DO NOT use 2 conductor mono headphones with the CR 1 SERIES 2 9 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 CR 1 SERIES 2 Rev 02 Ver 3 06 Page 14 November 30 2005 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 physically 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 performe
37. world s first real time dedicated digital de crackler offering unique buzz removal and distortion reduction facilities The CR 1 SERIES 2 offers even greater processing power and performance power exceeding that obtained using digital signal processors DSPs installed in desk top or larger computer systems excepting of course the CEDAR Production Systems The CR 1 SERIES 2 is designed for professional use although it will work perfectly well in a domestic environment and its features include the following e The latest SERIES 2 CEDAR hardware Digital Audio interfaces conforming to the AES EBU and SP DIF standards e 24 bit input and output resolution when using AES EBU interfaces e Three sample rates supported on digital inputs 32kHz 44 1kHz and 48kHz e Two sample rates supported on analogue inputs 44 1kHz and 48kHz e Balanced analogue inputs and outputs for connection to professional analogue equipment e ADC and DAC converters using the latest 64x over sampling A gt Delta Sigma technology e gt 103dB dynamic range A D and gt 93dB dynamic range D A e Mountable in a 19 EIA rack Remote control via MIDI and RS232 interfaces e SMPTE EBU timecode capabilities via optional upgrade e Input and output LED bar graph VU meters e Twin 40 bit floating point DSP processors delivering 50MFlops to handle the most complex audio processing requirements High levels of artificial intelligence designed into the CR
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