Cedar DC-1 Owner's Manual
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Cedar DC-1 Owner's Manual

De-clicker series 2 digital audio restoration system
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Over
Power
0dB
-10
-20
-40
Level
Phones
Input Level
interstage
Phistersvej 31, 2900 Hellerup, Danmark
Telefon 3946 0000, fax 3946 0040
www.interstage.dk
- pro audio with a smile
DC-1 SERIES 2: Rev.02 Ver.3.06
CEDAR
Professional Hardware Systems
DC-1 De-Clicker
Digital Audio Restoration System
Over
0dB
-10
-20
-40
6
8
4
CEDAR Audio Ltd
10
2
12
0
A member of the
Association of Professional Recording Services
Output Attenuation
Digital
44.1kHz
Bypass
48kHz
Bypass
Pre
Post
Pre/Post
CEDAR
Contrast
OWNER'S MANUAL
© 1994 CEDAR Audio Ltd. Written by Gordon Reid
SERIES 2
Page
Enter
De-Clicker DC 1
SERIES 2
Page - 1

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  • Page 1 Phones Input Level Output Attenuation OWNER'S MANUAL interstage © 1994 CEDAR Audio Ltd. Written by Gordon Reid Phistersvej 31, 2900 Hellerup, Danmark Telefon 3946 0000, fax 3946 0040 www.interstage.dk - pro audio with a smile DC-1 SERIES 2: Rev.02 Ver.3.06...

  • Page 2: Table Of Contents

    ............................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 DC-1 SERIES 2 .....................18 EDICATED ONTROLS .............................18 PAGES ...................................20 Control Page ..............................21 Input/Output Control Page ..........................23 Remote Control ...............................27...

  • Page 3: Introduction

    (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: •...

  • Page 4: The Background To Scratch Removal

    (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).

  • Page 5: Safety Instructions

    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.
  • Page 6 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.

  • Page 7: Set Up

    • 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˚...

  • Page 8: Connections

    CONNECTIONS The DC-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.
  • Page 9 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.

  • Page 10: Other Connections

    OTHER CONNECTIONS 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 IN/OUT/THRU The operation of the DC-1 SERIES 2 may be controlled using the Musical Instrument Digital Interface (MIDI).

  • Page 11: Sample Installation Ideas

    MIXER RECORDER effects send effects return line in line in line out DC-1 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...

  • Page 12: A Guide To Restoration Processing

    • Finally, apply whichever De-Hiss process you wish to use. Note: 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.
  • Page 13 Post Pre/Post Enter Level CEDAR CEDAR Audio Ltd De-Hisser DH 1 A member of the SERIES 2 Association of Professional Recording Services Contrast Phones Input Level Output Attenuation Finally, apply noise reduction. DC-1 SERIES 2: Rev.02 Ver.3.06 Page - 13...

  • Page 14: Front Panel Indicators And Controls

    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.
  • Page 15 (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.

  • Page 16: Quick Tour

    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: READ THE SAFETY INSTRUCTIONS. Connect the DC-1 SERIES 2 to the mains supply.

  • Page 17: Warmstart And Coldstart

    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.

  • Page 18: Operating The Cedar Dc-1 Series 2

    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, preventing accidental changing of parameters;...
  • Page 19 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 0dB to -10dB in 1dB steps. DC-1 SERIES 2: Rev.02 Ver.3.06 Page - 19...
  • Page 20 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 will appear in the following order: •...

  • Page 21: Control Page

    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.
  • Page 22 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 23: Input/Output Control Page

    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. •...
  • Page 24 48 kHz LED lit = 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.
  • Page 25 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.
  • Page 26 • 2 - Code If there is an incoming signal yet the LED flashes on error level 2, the DC-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.

  • Page 27: Remote Control

    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.

  • Page 28: 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.
  • Page 29 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.
  • Page 30 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...

  • Page 31: Notes And Hints To Users

    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.

  • Page 32: Remote Control Protocols

    REMOTE CONTROL PROTOCOLS RS232 RS232 is defined in 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 0xAF byte 2: Checkbyte.
  • Page 33 Refresh 0x24 Set Right Threshold Any value Right Threshold x 100 The minimum threshold is 0. The maximum threshold is 40 0x34 Alter Right Threshold Any value ∆ (Right Threshold) x 100 DC-1 SERIES 2: Rev.02 Ver.3.06 Page - 33...

  • Page 34: Midi

    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.

  • Page 35: Self Test Mode

    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:...
  • Page 36 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 the screen will display the message: "Memory error at: ..".
  • Page 37 21, 31 Over, 14 VU meters, 3 Dithering, 9 dithering, 23 Page, 14, 18 Warmstart, 17, 34 DSP, 29, 36 peak, 14 dynamic range, 3 Phase-EX, 12 XLR, 9, 23 phono, 23 DC-1 SERIES 2: Rev.02 Ver.3.06 Page - 37...
  • Page 38 CEDAR Audio Ltd 5 Glisson Road Cambridge CB1 2HA Tel: & Fax: +44 (0)223 464117 interstage Phistersvej 31, 2900 Hellerup, Danmark Telefon 3946 0000, fax 3946 0040 www.interstage.dk - pro audio with a smile DC-1 SERIES 2: Rev.02 Ver.3.06 Page - 38...

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