Cedar DC-1 De-Clicker User manual

CEDAR
Professional Hardware Systems
DC·1 De·Clicker
Digital Audio Restoration System
5 /11/ j)C!...- {. ?- -0 i.f --00g ~
SERIES 2
OWNER'S MANUAL
© 1996 CEDAR Audio Ltd

CONTENTS
Introduction 1
The Background to Scratch Removal 2
Safety Instructions 3
Set Up 5
Unpacking and Inspection 5
INSTALLATION SITE 5
RACK MOUNTING 5
FREE STANDING USE 5
Connections 7
BEFORE CONNECTION 7
POWER CONNECTIONS 7
SIGNAL LEAD CONNECTIONS 7
OTHER CONNECTIONS 9
Sample Installation Ideas 10
A Guide to Restoration Processing
11
Front Panel Indicators and Controls 14
Quick Tour 16
Warmstart and Coldstart 17
Operating the CEDAR
DC-1 SERIES 2 18
DEDICATED CONTROLS: 18
PAGES 19
CONTROL PAGE 20
INPUT/OUTPUT CONTROL 22
REMOTE CONTROL 26
STATUS PAGE 27
STATUS INDICATORS 27
STATUS PAGE DEFINITIONS 28
Notes and Hints to Users 29
Remote Control Protocols 30
RS232 30
MIDI 32
SELF TEST MODE 33
Index 35
Declaration of Conformity Certificate 38

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. No other commercial system
can match the performance of the CEDAR declicking 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,
44.1 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 Delta-Sigma
technology.
• >103dB dynamic range AID and >93dB dynamic range D/A
• Mountable in a 19" EIA rack.
• Remote control via MIDI and RS232 interfaces.
• Input and output LED bar-graph
VU meters.
• Twin 40-bit floating point DSP processors delivering 50MFIops to handle the
most complex audio processing requirements.
• High levels of artificial intelligence designed into the
DC-1 program algorithms
making it extremely simple to use.
DC-1 SERIES 2: Rev, Q2 Ver,3, Q6
December 4
th
, 1996

THE BACKGROUND TO SCRATCH REMOVAL
The term 'scratch' is often used to describe many different audio phenomena -ticks,
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 totally 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
then 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
December 4th, 1996 2

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.
2. Save these instructions for future reference.
3. Follow all warnings and instructions.
4. 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 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 sllorting to occur. This
cou
Id severely damage the DC-1 and even cause danger to life. ALWAYS
allow time for the
DC-1 to naturally reach ambient temperatures before
connecting the mains power.
5. 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.
6. Wall or Ceiling Mounting
The DC-1 SERIES 2 has not been designed for mounting directly to walls or
ceilings.
7. 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 which impedes the flow of air through the vents at the 'front and rear.
Do not place the
DC-1 on a soft surface.
8. 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 or tape machines should not be a problem.
DC-1 SERIES 2: Rev. 02 Ver.3. 06
December 4
1h
, 1996 3

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 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 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 seNice personnel when:
• objects have fallen into the unit
• liquid has been 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 seNice the DC-1 SERIES 2 beyond the
instructions contained in the User's Manual. All other seNicing should be
referred
to qualified seNice personnel.
DC-1 SERIES 2: Rev.02 Ver .3.06
December 4
th
, 1996 4

SETUP
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:
• power lead
• this manual and warranty registration documents
• the unit
• blanking plates
2. 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).
• Relative humidity should
be in the range 30% to 60% non-condensing.
• Strong magnetic fields should not exist nearby.
3. Rack Mounting
The DC-1 SERIES 2 can be mounted in a standard 19" EIA rack.
4. Free Standing use
The DC-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:
• Unscrew the three bolts which attach each ear to the chassis of the
DC-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
December 4th, 1996 5

Power
Balanced Balanced
Connector
Timecode
Analogue
Analogue
with integral
Input and Output
Inputs
Outputs
fuse holder
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VITC
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I ° ° AES -IN -SPDIF SPDIF - o~ -AES IN OUT THRU
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RS 232 INTERFACE
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Digital VO
SP-DIF f
MIDI RS232
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Digital 1/0
AES/EBU
• CAUTION POWER •
DO NOT OPEN
RISK OF ELECTRIC SHOCK ~
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Serial No: •
-
DC-1 SERIES 2: Rev.02 Ver.3.06
December 4
th
, 1996 6

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.
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.
• 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.
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
1/0
• digital SP-DIF format audio data
• digital AES/EBU format audio data
Note that the
OC-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 eitherAESIEBU SP-OIF, as defined by the userparameters.
DC-1 SERIES 2: Rev.02 Ver.3.06
December 4
th
, 1996 7

(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 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 OAT 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
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/EBU input of the DC-1 SERIES 2 using a single cable terminated
with XLR plugs.
The AES/EBU output of the DC-1 SERIES2 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.
In order to fully comply with EMC regulations, this unit should be connected
via its AES/EBUand/oranalogue connectors. Metal-shelled XLR connectors
should be used. We recommend using a good quality 'starquad' cable, with
three cores connected
to pins 1, 2 &3. The shield of the cable shouldbe
connected,
at both ends, to the outershell of the connector.
DC-1 SERIES 2: Rev.02 Ver.3.06
December 4
th
, 1996 8