Cedar CR-1 De-Crackler Owner's Manual

Text of Cedar CR-1 De-Crackler User Guide:

• 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 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 con

• Cedar CR-1 De-Crackler, 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: • De-Clicking (De-Scratching) should ALWAYS be carried out first. This is because: 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

• 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 predominantly from well defined crackles, or from more 'grungy' artefacts. The Mode parameter enables you to

• Cedar CR-1 De-Crackler, CEDAR CR-1 SERIES 2 Designed and Manufactured by CEDAR Audio Ltd 5 Glisson Road Cambridge CB12HA Tel: & Fax: +44 (0)223 464117 CR- 1 SERIES 2: Rev.02 Ver.3. 06 Page - 39 October 10. 1995

• Cedar CR-1 De-Crackler, TABLE OF CONTENTS TABLE OF CONTENTS ............................................................................................. 2 INTRODUCTION ........................................................................................................3 THE BACKGROUND TO CRACKLE REMOV AL. .............................................4 SAFETY INSTRUCTIONS .........................................................................................5 SET UP ...........................................................................................................................7 Unpacking and Inspection .....................................................................

• Cedar CR-1 De-Crackler, 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 a-dial. 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

• Cedar CR-1 De-Crackler, ROUTINE 6: DSP1 TEST The CR-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 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 obseNe this message ple

• Cedar CR-1 De-Crackler, 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 • To prevent problems and possible equipment damage, turn off the power to all equipment before making connections. • Be sure to insert plugs firml

• Cedar CR-1 De-Crackler, 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

• Cedar CR-1 De-Crackler, 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

• Cedar CR-1 De-Crackler, (i) Balanced analogue audio 1/0 (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-professional digital audio devices such as DAT machines, some ADCs, and some CD

• Cedar CR-1 De-Crackler, 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 w~lich 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. • MIDI CHANNEL Ensure that butt

• Cedar CR-1 De-Crackler, 10. 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 (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 1 dB steps.

• Cedar CR-1 De-Crackler, 16-bit 24 24-bit 3, 9, 24 32kHz 3, 25, 26 44.1 kHz 3, 25, 26 48kHz 3, 25, 26 50/1530 A to 0 frequency 17 a-dia114,20 AOC 3,4 AES Sync 26 AES/EBU 3, 8, 9, 16,24,26, 27,30 amplitude distortion 4 analogue 3, 8 Attenuation 15, 19 automation 35 Azimuth Correction 12 balanced 9 blanking plates 7 buzz 4 Bypass 14, 17, 18 CD9 CEDAR DC-l 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,

• 0 0 CD 0 CD CD 0 Power Switch Input Signal Meters 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 @ @)

• 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. Out

• Cedar CR-1 De-Crackler, 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 S

• Cedar CR-1 De-Crackler, 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: • Bypass • Page • Pre/Post • Enter I/O Level Controls 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 output. Analogu

• INTRODUCTION Thank you for purchasing the CEDAR CR-1 De-Crackler. The original CR-1 was the 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) i

• Cedar CR-1 De-Crackler, 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 . READ THE SAFETY INSTRUCTIONS. 2. Connect the CR-1 SERIES 2to the mains supply. 3. 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). 4. Hold d

• Cedar CR-1 De-Crackler, STATUS PAGE DEFINITIONS: Crashed Timed Out Running Error Emphasis Sample Rate Illegal Checkbyte CR- 1 SERIES 2: Rev.02 Ver.3.06 October 10, 1995 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. 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

• Cedar CR-1 De-Crackler, - - - - - - SAMPLE INSTALLATION IDEAS anaklgue or analogue or or Ina olA dignal in digi tal out - igrtal in TURNTABLE 0 CR·1 RECORDER TAPE MACHINE I - lnein AMP I 1. CR-1 SERIES 2 used in-line for transcription or broad cast purposes. anaklgue or analogue or anakl9ue or di gnal 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 stud io 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 edi

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