DCS dCS 974 User Manual
© 2001 dCS Ltd
dCS 974
Digital to Digital Converter
User Manual
Software version 1.0x
May 2001
All rights reserved. Reproduction of this manual in any manner whatsoever,
without the written permission of dCS
this manual may be obtained from dCS.
Information contained in this manual is subject to change without notice, and
whilst it is checked for accuracy, no liabilities can be accepted for errors.
1
Ltd is Data Conversion Systems Ltd. Company registered in the England no. 2072115
dCS
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is strictly forbidden. Additional copies of
dCS 974 User Manual Manual for Software Version 1.0x
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Document No: OS-MA-A0124-112.1A1
dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
RODUCT OVERVIEW
P
The dCS 974 DDC (Digital to Digital Converter) is a high performance real time
sample rate and format converter, developed from our highly successful
dCS 972. It is designed for studio applications where source material is available
in one format, but outputs are required in other digital formats in real time. For
example, archives might be made for storage in 24/192 or 24/176.4 formats,
and then used to produce output in SACD, DVD, CD and other multimedia
formats. AES3, SPDIF, SDIF-2 and DSD formats are all supported, and multiple
units may be synchronised for stable multi-channel operation.
The unit is mains powered and is housed in a 2U (3.5”) high 19” rack mounting
case. It may be controlled either from its front panel, or from a software based
remote control running on a PC. Frequently used Setups may be stored and recalled later. The last setting is automatically stored on power down, so that fixed
installations may be set up at leisure, installed and then left alone. Unauthorised
alterations to settings may be prevented by a “panel lock out” feature.
Numerous monitoring functions are provided – both for the audio signal and for
messaging attached to it. The unit has bit activity and level meters, and
message manipulation. CRC, parity and invalid errors may be monitored and
reported, so that “right first time” transfer to disc plants may easily be achieved.
Formats
Functions
The unit is highly software based, and more functions and features are added
from time to time. Software updates from dCS are free!
2
• DSD at 2.822MS/s (see page 71)
• PCM from 192 kS/s down to 11.025 kS/s (see page 43)
• PCM data formats supported are: AES/EBU (XLR), Dual (2 wire) AES3
(XLR), Quad (4 wire) AES3 (XLR), SPDIF (Phono, Toslink and BNC) and
SDIF-2 (see page 70)
• DSD data formats supported are SDIF-2 (BNC), SDIF-3 (BNC) and DSD
Quad (4 wire - XLR)
• Sample Rate and Format Conversion (page 34)
• Multi-channel Sync capability (page 42)
• Bit for bit multiplex/de-multiplex mode (page 39)
• PCM to DSD, DSD to PCM
• DC Removal for DSD
• Multiple filters on many major sample rate conversions (page 45)
• Dither – 3 types (see page 47)
• Noise shaping – 10 different options on all major PCM sample rates (page
47).
• Output Level control with “Maximise” (page 48)
• Balance control (page 48).
• Digital Silence out with digital silence in (page 50)
Syncing
Comprehensive - can sync to Wordclock or AES reference, or signal, and sync
to video option available.
2
free if we email them, and you download from a PC COM port. Low cost if you ask us for EPROMs or other
media - we charge for media and handling.
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Monitoring
Bit Activity (page 56), Stereo Output Level (page 57), and CRC, Parity & Invalid
flag errors in the input data (page 52).
Test Generator
High quality (160 dB) signal generator with mHz resolution (page 53). Can be
dithered and/or noise shaped truncated.
Ease of Use
User programmable set-ups (page 61)
Pre-loaded setups
Remembers last settings
Lockouts (page 64)
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
About this Manual
If you have not used a dCS 974 before, please read the section Using Your
dCS 974 For The First Time on page 110.
This manual has been arranged with the most commonly used sections placed
first:
• table of contents (page 6)
• step-by-step (page 10) and applications guides (page 22)
• detailed software and hardware information (page 34)
• technical information (page 70)
• information for first time users (page 110)
• options, maintenance and troubleshooting (page 114)
• index section (page 124)
References to other sections in the text have the Section Name, page … with
Section Name in bold. Sometimes, if you are reading a soft copy of the manual,
section names and page numbers are hyperlinks – click on them, and you will
go there.
IMPORTANT!
The manual is designed to be helpful. If there are points you feel we could cover
better, or that we have missed out - please tell us.
About Sample Rates
All references to sample rates in this manual use the unit kS/s (kilo Samples per
second) rather than the technically incorrect kHz.
Important information is presented like this - ignoring this may cause you to
damage the unit, or invalidate the warranty.
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Document No: OS-MA-A0124-112.1A1
dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
ONTENTS
C
Product Overview ...............................................................................................3
About this Manual 5
About Sample Rates 5
Contents ..............................................................................................................6
Step-by-Step Guide ..........................................................................................10
Preliminaries 10
Step 1 – Selecting an Input 11
Connecting to a Single AES or SPDIF source 11
Connecting to a PCM SDIF-2 source 11
Connecting to a Dual AES Source 12
Connecting to a Quad AES source 12
Connecting to a DSD SDIF-2 source 12
Connecting to a DSD Quad source 12
Step 2 – Setting the Sync Source 13
Syncing to an External Wordclock 13
Syncing to an AES/EBU Reference 14
Step 3 - Setting a Conversion 15
Format Conversion 15
Sample Rate Conversion 16
Step 4 – Connecting the Outputs 18
Connecting a Single AES or SPDIF Output 18
Connecting the SDIF-2 Output 18
Connecting the Dual AES Outputs 18
Connecting the Quad AES or DSD Quad Outputs 18
Connecting the DSD SDIF-2 or DSD SDIF-3 Output 18
Step 5 – Reducing the Output Wordlength 19
Other Settings 21
Typical Applications.........................................................................................22
Converting a 24/96 recording to CD format 22
Demultiplexing a 24/96 Dual AES recording (Bit for Bit) 23
Upsampling a CD 24
General Sample Rate Conversion and Distribution 25
PCM to DSD 26
Using a Master Clock 27
Converting Quad AES to CD Format 28
Multi-channel Sample Rate Conversion – bit aligned sources 29
Multi-channel Sample Rate Conversion – Using a Master Clock 30
Multi-channel Sample Rate Conversion – with more alignment tolerance 31
Multi-channel Sample Rate Conversion – with multiple sample rates out 32
The Software – Menu and Setups ...................................................................34
Navigating through the Menu – what the On-Screen symbols mean 36
Top Menu 38
Sample Rate Conversion 38
Format Conversion 39
Error Monitoring 39
Test 39
Info 39
Bit Activity Monitors 40
Level Meters 40
Display 40
Sample Rate Conversion / Format Conversion Submenu 41
Audio Input Select 41
Sync Source 41
Multiple Channel Sync 42
Input Sample Rate 43
Output Sample Rate 43
Output Mode 45
Filter 45
Output Word Length 46
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dCS Ltd May 2001
Noise Shaping 47
Dither 47
AES Message Edit 48
SPDIF Message Edit 48
Gain/Balance and Maximise 48
Swap Channels 49
Phase 49
Detect Silence 50
De/Pre-Emphasis 50
Display Customise 50
Error Monitor Submenu 52
Error Hold and Reset 52
Test Submenu 53
Generator Overview 53
Controlling the Generator 53
Generator Amplitude Adjustment 54
Generator Frequency Adjustment 54
Self Test 55
Info Submenu 56
Bit Activity Monitor Submenu 56
Bit Activity Monitoring Overview 56
Setting the Monitor 56
Level Meters Submenu 57
Level Meter Overview 57
Turning the Level Meters On 57
Meter Type (Bar or Numerical) 58
Decay Time 58
Peak Hold 58
Using the dCS 974 to monitor a track 59
Watch Out for this One! 59
Display Submenu 60
Setups and Locking the Front Panel 61
Storing a Setup 61
Fixed Setups 63
Recalling a Setup 63
Locking Out Changes, and Unlocking Again 64
The Hardware – Controls and Connectors ....................................................66
Rear Panel 66
Signal Inputs 66
Signal Outputs 67
Control and Power 67
Additional Information 67
Front Panel 68
Power Indicator 68
OPERATION buttons 68
MEMORY buttons 68
LCD display 68
LED indicators 69
Rotary encoder 69
dCS 974 Technical Information.........................................................................70
Digital Data Formats Supported 70
DSD 71
PCM Input and/or Output Performance 73
Clocking 76
Sample Alignment 77
Multiple Channel Sync’ing 81
Multiple Channel Multiple Sample Rate Synchronising 83
Noise Shaping 84
Dither 85
Digital Interface Specifications 86
Message Handling 88
AES/EBU Message Handling 88
SPDIF Message Handling 89
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SDIF-2 Message Handling 90
SDIF-3 Message Handling 90
Power Consumption 91
Size, Weight and Operating Conditions 92
dCS 974 Performance Curves ...........................................................................94
General Technical Information......................................................................104
Word Length Reduction 104
Using Your dCS 974 For The First Time ........................................................110
What’s in the Box? 110
Supply Voltage Setting 110
Getting Started 110
Installing the Unit in a Rack 112
Options ............................................................................................................114
Locking to Video Sample Rates 114
Mains Supply Voltage 114
Ordering Options for a New Unit 114
Having Your Options Changed 114
Maintenance and Support..............................................................................116
Hardware 116
Service & Maintenance 116
User Changeable Parts 116
Software 117
Installing New Software 117
Warranty 118
Initial Warranty 118
Extended Warranty 118
Warranty Exclusions 118
Obtaining Service 118
Update or Calibration 119
Safety and Electrical Safety 119
Troubleshooting .............................................................................................120
FAQs 120
If You Need More Help 123
Other Information 123
Indexes and Software Version Numbers......................................................124
Definitions of Units 124
Tables 124
Figures 125
Keywords and Phrases 126
Owner Registration Transfer 131
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dCS 974 User Manual Manual for Software Version 1.0x
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TEP-BY-STEP GUIDE
S
This section guides you through setting up the unit for basic operation. You may
find this useful if you have not used the dCS 974 for a while.
Preliminaries
The Quick Start Guide sheet details the menu structure and outlines the use of
the front panel controls. For more information, see Navigating through the
Menu – what the On-Screen symbols mean on page 36 and The Software –
Menu and Setups on page 34. We will be changing settings in either the
Sample Rate Conversion menu or the Format Conversion menu. Use the
rotary control to scroll up and down the screen and the Operation buttons to
change menu levels or select items.
Connect up with cables designed for digital audio:
• for AES/EBU interfaces use 110Ω screened, twisted pair cables fitted with
one male XLR connector and one female XLR connector.
• for DSD/SDIF or SPDIF BNC interfaces, use 75Ω coax cables fitted with
BNC plugs.
• for SPDIF RCA interfaces, use 75Ω coax cables fitted with RCA Phono
plugs.
• for SPDIF TOS interfaces, use Toslink fibre-optic cables.
Power up the unit and wait for about 20 seconds while it configures itself. The
screen will show:
Press the Recall button. When the screen displays the Recall Setup list, press
the Recall button again to change to the preset setup list, then press the Enter
button. Wait while the unit loads the default setup (Store A) then displays a
Status screen similar to this:
The Power and Unlocked indicators should be lit, the other indicators should
be off.
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Step 1 – Selecting an Input
TOP LEVEL
Sample Rate Conversion
Audio Input Select AES 1 Default
Sync Source AES 2
Multi-Channel Sync AES 3
Input Sample Rate AES 4
Dual AES (1+2)
Quad AES
SPDIF1 (RCA)
SPDIF2 (BNC
SPDIF3 (TOS)
PCM SDIF-2
DSD SDIF-2
DSD Quad
Figure 1 – Audio Input Selection
Choose one of the following five sections:
Connecting to a Single AES or SPDIF source
do this: Connect your source equipment to the matching input on the dCS 974 rear panel
using suitable cables. An AES3 source (XLR connector) may be connected to
any of the four AES/EBU inputs.
do this: Press the →→→→ button twice to enter first the Sample Rate Conversion menu,
then the Audio Input Select menu. Use the rotary control to scroll down the list
until the cursor is beside your chosen input (either AES 1, AES 2, AES 3, AES 4,
SPDIF 1 (RCA), SPDIF2 (BNC) or SPDIF3 (Toslink)). Press the Set button.
The screen will change back to the Sample Rate Conversion menu. Proceed
to Step 2.
Connecting to a PCM SDIF-2 source
do this: Connect the SDIF-2 output on your source equipment to the upper block of
DSD/SDIF connectors on the dCS 974 rear panel using 3 coax cables. Connect
CH1 out to CH1 IN, CH2 out to CH2 IN, CLK out to WCLK IN. Fit a 75Ω
terminating plug to the nearby LOOP OUT connector.
do this: Press the →→→→ button twice to enter first the Sample Rate Conversion menu,
then the Audio Input Select menu. Use the rotary control to scroll down the list
until the cursor is beside PCM SDIF-2. Press the Set button to select it.
The screen will change back to the Sample Rate Conversion menu. Proceed
to Step 2.
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dCS 974 User Manual Manual for Software Version 1.0x
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Connecting to a Dual AES Source
do this: Check that your source equipment is capable of Dual AES operation.
do this: Connect the AES 1 (or AES A) output on your source equipment to the AES 1
input on the dCS 974 rear panel and the AES 2 (or AES B) output to the AES 2
input, using two XLR cables. Ensure the cables are not swapped.
do this: Press the →→→→ button twice to enter first the Sample Rate Conversion menu,
then the Audio Input Select menu. Use the rotary control to scroll down the list
until the cursor is beside Dual AES. Press the Set button to select it.
The screen will change back to the Sample Rate Conversion menu. Proceed
to Step 2.
Connecting to a Quad AES source
do this: Check that your source equipment is capable of Quad AES operation.
do this: Connect the AES 1 output on your source equipment to the AES 1 input on the
dCS 974 rear panel, the AES 2 output to the AES 2 input, the AES 3 output to
the AES 3 input and the AES 4 output to the AES 4 input, using four XLR
cables. Ensure the cables are connected in the correct order.
do this: Press the →→→→ button twice to enter first the Sample Rate Conversion menu,
then the Audio Input Select menu. Use the rotary control to scroll down the list
until the cursor is beside Quad AES. Press the Set button to select it.
The screen will change back to the Sample Rate Conversion menu. Proceed
to Step 2.
Connecting to a DSD SDIF-2 source
do this: Check that your source equipment is capable of DSD-SDIF operation.
do this: Connect the DSD SDIF-2 output on your source equipment to the upper block
of DSD/SDIF connectors on the dCS 974 rear panel using three coax cables.
Connect CH1 out to CH1 IN, CH2 out to CH2 IN and CLK out to WCLK IN. Fit a
75Ω BNC terminating plug to the nearby LOOP OUT connector.
do this: Press the →→→→ button twice to enter first the Sample Rate Conversion menu,
then the Audio Input Select menu. Use the rotary control to scroll down the list
until the cursor is beside DSD SDIF-2. Press the Set button to select it.
There will be a noticeable delay while the DSD code loads, then the screen will
change back to the Sample Rate Conversion menu. The dCS 974 will
automatically detect either SDIF-2 or SDIF-3. Proceed to Step 2.
Connecting to a DSD Quad source
do this: Check that your source equipment is capable of DSD Quad operation.
do this: Connect the AES 1 output on your source equipment to the AES 1 input on the
dCS 974 rear panel, the AES 2 output to the AES 2 input, the AES 3 output to
the AES 3 input and the AES 4 output to the AES 4 input, using four XLR
cables. Ensure the cables are connected in the correct order.
do this: Press the →→→→ button twice to enter first the Sample Rate Conversion menu,
then the Audio Input Select menu. Use the rotary control to scroll down the list
until the cursor is beside DSD Quad. Press the Set button to select it.
There will be a noticeable delay while the DSD code loads, then the screen will
change back to the Sample Rate Conversion menu. Proceed to Step 2.
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dCS 974 User Manual Manual for Software Version 1.0x
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Step 2 – Setting the Sync Source
do this: Switch on the source equipment. If appropriate, load a disk / tape and set the
machine in PLAY mode to ensure it is generating a digital audio data stream.
The dCS 974 will be set to sync to the selected Audio Input and the Input
Sample Rate will be Auto detected. The unit should lock and the Unlocked
indicator should turn off. If you do not want to use an external reference clock,
proceed to Step 3.
TOP LEVEL
Sample Rate Conversion
Audio Input Select
Sync Source Audio Input Default
Multi-Channel Sync AES Loop
Input Sample Rate AES Loop Term
Wordclock
Internal
Lab Ref (10MHz)
Figure 2 – Sync Source Selection
If a stable clock source is available, you can reduce jitter in your system by
syncing to it. Choose one of the following two sections:
Syncing to an External Wordclock
If you want to synchronise your system to Wordclock from a Master Clock (such
as the dCS 992) or other stable source, do the following:
do this: Set the Master Clock sample rate to match the source (probably 44.1 or
48kS/s).
do this: Connect either a Wordclock or AES/EBU output from the Master Clock to the
clock input on the source equipment and ensure it is locked.
do this: Connect another Wordclock output from the Master Clock to the WCLK IN
connector (upper block of DSD/SDIF connectors) on the dCS 974 rear panel. Fit
a 75Ω BNC terminating plug to the nearby LOOP OUT connector.
If the source equipment uses SDIF-2 (in either PCM or DSD mode), the
Wordclock feed from the Master Clock replaces the Wordclock feed from the
source equipment.
do this: Scroll down the Sample Rate Conversion menu to Sync Source and press
the →→→→ button. Scroll down the list to Wordclock and press Set.
The Unlocked indicator will light for a few seconds, then turn off as the unit relocks.
do this: Proceed to Step 3.
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dCS 974 User Manual Manual for Software Version 1.0x
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Syncing to an AES/EBU Reference
If you want to synchronise your system to an AES/EBU Reference from a
Master Clock (such as the dCS 992) or other stable source, do the following:
do this: Set the Master Clock sample rate to match the source (probably 44.1 or
48kS/s).
do this: Connect either an AES/EBU or Wordclock output from the Master Clock to the
clock input on the source equipment and ensure it is locked.
do this: Connect another AES/EBU output from the Master Clock to the AES Ref Loop
IN connector on the dCS 974 rear panel.
do this: Scroll down the Sample Rate Conversion menu to Sync Source and press
the →→→→ button. Scroll down the list to AES Loop Terminated and press Set.
The Unlocked indicator will light for a few seconds, then turn off as the unit
re-locks.
do this: Proceed to Step 3.
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dCS 974 User Manual Manual for Software Version 1.0x
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Step 3 - Setting a Conversion
do this: If you need bit-for-bit operation in a different output format, proceed to the
Format Conversion section.
do this: If you want to change the sample rate or the word length or process the data in
some other way, proceed to the Sample Rate Conversion section.
Format Conversion
TOP LEVEL
Format Conversion
Pure Format Conversion Off Default
Audio Input Select On
Sync Source
Multi-Channel Sync
Input Sample Rate
Output Mode Normal Default
Display Customise Dual AES
Quad AES
DSD SDIF-2
DSD SDIF-3
Figure 3 – Pure Format Conversion
do this: Press the ←←←← button, scroll down to Format Conversion , press the →→→→ button
and press the Set button. This sets Pure Format Conversion to On and
disables the Sample Rate Conversion menu.
do this: If the “Fs In not Fs Out” information box appears on the display, press the Set
button to make the Output Sample Rate match the Input Sample Rate.
do this: Scroll down the Format Conversion menu to Output Mode and press the →→→→
button. The cursor should be beside Normal. Choose one of the settings from
the following list, scroll to it and press Set:
• Normal. The Input & Output Sample Rate must not be higher than
96kS/s. Bit-for-bit data will be available on all of the AES, SPDIF or SDIF-2
outputs.
• Dual AES. The Input & Output Sample Rate must be 88.2, 96, 176.4 or
192kS/s. Dual AES bit-for-bit data will be available on the AES 1 / AES 2
output pair and the AES 3 / AES 4 output pair. Do not use the other outputs.
• Quad AES. The Input & Output Sample Rate must be 176.4 or 192kS/s.
Quad AES bit-for-bit data will be available on the AES 1, AES 2, AES 3 and
AES 4 output group. Do not use the other outputs.
• DSD SDIF-2. The Audio Input Select setting must be DSD or DSD Quad.
DSD SDIF-2 bit-for-bit data will be available from the DSD/SDIF outputs
(lower block) and DSD Quad data from the AES 1, AES 2, AES 3 and AES
4 output group. Do not use the other outputs.
• DSD SDIF-3. The Audio Input Select setting must be DSD or DSD Quad.
DSD SDIF-3 bit-for-bit data will be available from the DSD/SDIF outputs
(lower block) and DSD Quad data from the AES 1, AES 2, AES 3 and AES
4 output group. Do not use the other outputs.
do this: Proceed to Step 4.
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Sample Rate Conversion
TOP LEVEL
Sample Rate Conversion
Audio Input Select 192kS/s
Sync Source 176.4kS/s
Multi-Channel Sync ...
Input Sample Rate 12kS/s
Output Sample Rate 11.025kS/s
DSD Clock (DSD only)
Output Mode Normal Default
Filter Dual AES
Quad AES
DSD SDIF-2
DSD SDIF-3
Figure 4 – Sample Rate Conversion
do this: If DSD output formats are required, proceed to Setting the Output Mode.
Setting the Output Sample Rate
do this: If PCM outputs are required, scroll down the Sample Rate Conversion menu
to Output Sample Rate and press the →→→→ button. Scroll down the list to the
required rate and press the Set button.
If the selected conversion can be handled in one pass, the setting will be
accepted and the screen will change back to the Sample Rate Conversion
menu. If not, this information box will appear on the display:
do this: Press any button to display a list of valid output sample rates. Scroll down the
list to a suitable rate and press the Set button.
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dCS 974 User Manual Manual for Software Version 1.0x
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Setting the Output mode
do this: Scroll down the Sample Rate Conversion menu to Output Mode and press
the →→→→ button. The cursor should be beside Normal Choose one of the settings
from the following list, scroll to it and press Set:
• Normal. The Output Sample Rate must not be higher than 96kS/s. Single
wire data will be available on all of the AES, SPDIF or SDIF-2 outputs.
• Dual AES. The Output Sample Rate must be 88.2, 96, 176.4 or 192kS/s.
Dual AES data will be available on the AES 1 / AES 2 output pair and the
AES 3 / AES 4 output pair. Do not use the other outputs.
• Quad AES. The Output Sample Rate must be 176.4 or 192kS/s. Quad
AES data will be available on the AES 1, AES 2, AES 3 and AES 4 output
group. Do not use the other outputs.
• DSD SDIF-2. The input format must be DSD, DSD Quad or PCM at
44.1kS/s or more. DSD SDIF-2 data will be available from the DSD/SDIF
outputs (lower block) and DSD Quad data from the AES 1, AES 2, AE S 3
and AES 4 output group. Do not use the other outputs.
• DSD SDIF-3. The input format must be DSD, DSD Quad or PCM at
44.1kS/s or more. DSD SDIF-2 data will be available from the DSD/SDIF
outputs (lower block) and DSD Quad data from the AES 1, AES 2, AE S 3
and AES 4 output group. Do not use the other outputs.
do this: Proceed to Step 4.
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Step 4 – Connecting the Outputs
Choose one of the following five sections:
Connecting a Single AES or SPDIF Output
do this: If the Output Sample Rate is 88.2 or 96kS/s, check that your destination
equipment is capable of double speed operation.
do this: If you have set Output Mode to Normal, connect the required single wire
output on the dCS 974 rear panel to the matching inputs on the destination
equipment using suitable cables. Signals are available from any of the four
AES/EBU outputs or the three SPDIF outputs simultaneously.
Connecting the SDIF-2 Output
do this: If the Output Sample Rate is 88.2 or 96kS/s, check that your destination
equipment is capable of double speed operation.
do this: If you have set Output Mode to Normal, connect the lower block of DSD/SDIF
connectors on the dCS 974 rear panel to the destination equipment using 3 coax
cables. Connect CH1 OUT to CH1 in, CH2 OUT to CH2 in and WCLK OUT to
CLK in.
Connecting the Dual AES Outputs
do this: Check that your destination equipment is capable of Dual AES operation.
do this: If you have set Output Mode to Dual AES, connect the AE S 1 output on the
dCS 974 rear panel to the AES 1 (or AES A) input on the destination equipment
and the AES 2 output to the AES 2 (or AES B) input, using two XLR cables.
Ensure the cables are not swapped. An identical Dual AES pair is available
from the AES 3 and AES 4 outputs.
Connecting the Quad AES or DSD Quad Outputs
do this: Check that your destination equipment is capable of Quad AES or DSD Quad
operation.
do this: If you have set Output Mode to Quad AES or DSD Quad, connect the AES 1
output on the dCS 974 rear panel to the AES 1 input on the destination
equipment, the AES 2 output to the AES 2 input, the AES 3 output to the AES 3
input and the AES 4 output to the AES 4 input, using four XLR cables. Ensure
the cables are not swapped.
Connecting the DSD SDIF-2 or DSD SDIF-3 Output
do this: Check that your destination equipment is capable of DSD operation.
do this: If you have set Output Mode to DSD SDIF-2 or DSD SDIF-3, connect the lower
block of DSD/SDIF connectors on the dCS 974 rear panel to the destination
equipment using three coax cables. Connect CH1 OUT to CH1 in, CH2 OUT to
CH2 in and WCLK OUT to CLK in.
Note that the default setting for the DSD output clock is 44.1kS/s Wordclock
(rather than Bit clock at 2.82MS/s).
do this: Proceed to Step 5.
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Step 5 – Reducing the Output Wordlength
If you are using Pure Format Conversion or DSD output modes, the Output
Wordlength cannot be changed. Proceed to Other Settings.
If you are performing a sample rate conversion with PCM outputs, the
destination equipment can handle 24 bit data and you do not want to reduce the
wordlength then leave the Output Wordlength set to the default of 24 bits and
set Dither to Off. Proceed to Other Settings.
The dCS 974 generates 24 bit data, regardless of the input word length. If the
destination equipment cannot handle 24 bit data, the Output Wordlength
MUST be set to match. Noise Shaping and/or Dither MUST be applied to
smooth the transitions. If the extra bits are just ignored, the audio outputs may
sound grainy and unpleasant low effects will result. For more information, see
Word Length Reduction on page 104.
do this: Check the maximum input wordlength specification in the manual for the
destination equipment. You must set the dCS 974 to match this.
TOP LEVEL
Sample Rate Conversion
Audio Input Select
Sync Source
Multi-Channel Sync
Input Sample Rate 24 Default
Output Sample Rate 23
Output Mode ...
Filter 8
Output Wordlength
Noise Shaping Off Default
Dither 1st Order
AES Message Edit ...
10th Order
Off Default
Top Hat
Triangular
NS Triangular
Figure 5 – Setting Wordlength, Noise Shaping and Dither
do this: Scroll down the Sample Rate Conversion menu to Output Wordlength and
press the →→→→ button. Scroll down the list to the required number of output bits
and press Set.
do this: Scroll down the Sample Rate Conversion menu to Noise Shaping and press
the →→→→ button. From the list below, choose a suitable setting to match the
Output Wordlength:
• for 22 or 23 bits, scroll to 2nd order and press Set.
• for 20 or 21 bits, scroll to 3rd order and press Set.
• for 16, 17, 18 or 19 bits, scroll to 9th order and press Set.
do this: For 16 or 17 bits, scroll down the Sample Rate Conversion menu to Dither
and press the →→→→ button. Scroll down to NS Triangular and press Set.
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A wide variety of Noise Shaping and Dither setting combinations are possible.
For more information, see Word Length Reduction on page 104.
do this: Proceed to Other Settings.
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Other Settings
The basic set-up procedure is complete. The Sample Rate Conversion menu
contains several other menu pages. For more information, see Sample Rate
Conversion / Format Conversion Submenu, starting on page 41.
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
YPICAL APPLICATIONS
T
Converting a 24/96 recording to CD format
From 24 bit /
96kS/s source
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
IN OUT
CH1 IN
RCA
BNC
TOS
WCLK IN
CH1 OUT
DSD / SDIF
LOOP IN
CH2 IN
LOOP OUT
CH2 OUT
WCLK OUT
REMOTE
IN
LOOP
OUT
MAINS FUSE (2AT) ON OF F
16 bit / 44.1kS/s from
4 independent AES outputs
16 bit / 44.1kS/s
from 3 independent
16 bit / 44.1kS/s
SDIF-2 output
SPDIF outputs
Figure 6 – Double Speed 24/96 to CD format
The dCS 974 converts a double speed 96 kS/s 24 bit AES input to a 44.1 kS/s
16 bit signal available from all of the 4 AES, 2 electrical SPDIF, optical SPDIF or
SDIF-2 outputs. The conversion set up uses Filter 2 (there is a choice of 4).
The SonicStudio™ uses 24/96 as double speed AES at the time of writing.
do this: Connect Sonic Solutions SonicStudio™ workstation AES output to AES 1 input
on the dCS 974.
do this: Load the setup from Store K, or use the settings below.
do this: Output from any AES output or any of the SPDIF outputs or, using two data
cables and one clock, via the SDIF-2 outputs.
Sample Rate Conversion settings:
Sample Rate Conversion: On
Audio Input Select: AES 1
Sync Source: Audio Input
Input Sample Rate: Auto (96 kS/s)
Output Sample Rate: 44.1 kS/s
Output Mode: Normal
Filter: Filter 2
Output Wordlength: 16
Noise Shaping: 9th Order
Dither: Off
Detect Silence: On
AES Message Edit: Professional Off, Non-Audio Off
Mode: Stereophonic
SPDIF Message Edit: Professional Off, Non-Audio Off, Copy
Permit On
Format: Compact Disc
Gain: -0.1dB
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Demultiplexing a 24/96 Dual AES recording (Bit for Bit)
From 24 bit / 96kS/s
Dual AES source
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
24 bit / 96kS/s from
4 independent AES outputs
Ensure AES 1 & AES 2
are connected correctly
AES / EBU INPUTS
AES / EBU OUTPUTS
AES 1 = Left data
AES 2 = Right data
AES / EBU REFERENCE LOOP SPDIF
IN OU T
AES CLK OUT SYNC INPUT
IN OUT
24 bit / 96kS/s
from 3 independent
SPDIF outputs
CH1 IN
CH2 IN
REMOTE
WCLK IN
CH1 OUT
LOOP IN
LOOP OUT
CH2 OUT
WCLK OUT
RCA
BNC
TOS
DSD / SDIF
IN
LOOP
OUT
MAINS FU SE (2AT) ON OFF
24 bit / 96kS/s
SDIF-2 output
Figure 7 – Converting dual AES 24/96 to a single wire double speed one
The dCS 974 converts a 96 kS/s 24 bit Dual AES input to a double speed
96 kS/s 24 bit signal available from any or all of the 4 AES, 2 electrical SPDIF,
optical SPDIF or SDIF-2 outputs. When using the Format Conversion menu,
the operation is bit for bit on the audio data (messages can be edited).
do this: Connect Nagra-D, Genex G-8000, SADIE, Lake DSP, etc dual AES source to
inputs AES 1 and AES 2 on the dCS 974.
do this: Load the setup from Store J and set Pure Format Conversion to On, or use
settings below.
do this: Output from any AES output or any of the SPDIF outputs or, using two data
cables and one clock, via the SDIF-2 outputs. The outputs will all be at “double”
speed.
Format Conversion settings:
Pure Format Conversion: On
Audio Input Select: Dual AES
Sync Source: Audio Input
Input Sample Rate: Auto (96 kS/s)
Output Sample Rate: 96 kS/s
Output Mode: Normal
AES Message Edit: Professional On, Non-Audio Off
Mode: Stereophonic
SPDIF Message Edit: Professional On, Non-Audio Off, Copy
Permit On
Format: 2-Ch Gen Format
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Upsampling a CD
DIGITAL OUT
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PU SH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
24 bit / 96kS/s (or 192kS/s)
Dual AES to DAC
CLOCK IN
16 bit / 44.1kS/s digital audi o
AES / EBU REFERENCE LOOP SPDIF
IN OU T
AES CLK OUT SYNC INPUT
L
R
IN OUT
Hand Crafted by
The Red Hot CD Player Co.
RCA
BNC
TOS
DSD / SDIF
CH1 IN
WCLK IN
CH1 OUT
LOOP IN
CH2 IN
LOOP OUT
CH2 OUT
WCLK OUT
REMOTE
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
Figure 8 – Upsampling a CD to 24/96 (or 24/192)
The dCS 974 converts a 44.1 kS/s 16 bit SPDIF input to a Dual AES 96 kS/s 24
bit signal available from AES 1 & AES 2 outputs. There is no information added
in the process, although you may wish to check theory here.
do this: Connect a source of CD material to the RCA input on the dCS 974.
do this: Enter the Sample Rate Conversion settings below.
do this: Connect Dual AES data from both AES 1 and AES 2 outputs to a DAC of your
choice.
do this: If your DAC is a dCS Elgar, dCS Delius or dCS 954, you can set the Output
Sample Rate to 192kS/s instead.
Sample Rate Conversion settings:
Sample Rate Conversion: On
Audio Input Select: SPDIF 1
Sync Source: Audio Input
Input Sample Rate: Auto (44.1 kS/s)
Output Sample Rate: 96 kS/s
Output Mode: Dual AES
Filter: Filter 2
Output Wordlength: 24
Noise Shaping: Off
Dither: Off
Detect Silence: Off
AES Message Edit: Professional On, Non-Audio Off,
Mode: Stereophonic
SPDIF Message Edit: Professional On, Non-Audio Off, Copy
Permit On
Format: 2-Ch Gen Format
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
General Sample Rate Conversion and Distribution
From ANY format: AES, SPDIF, Toslink, SDIF-2 at ANY sample rate:
11.025k, 12k, 16k, 22.05k, 24k, 32k, 44.1k, 48k, 88.2k or 96kS/s
Dual AES at 88.2k, 96k, 176.4k or 192kS/s
Quad AES at 176.4 or 192kS/s
DSD SDIF-2, DSD SDIF-3 or DSD Quad
or
or
or
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU REFERENCE LOOP SPDIF
IN OU T
AES CLK OUT SYNC INPUT
IN OUT
CH1 IN
RCA
BNC
TOS
WCLK IN
CH1 OUT
DSD / SDIF
LOOP IN
To ALL formats: AES, SPDIF, Toslink & SDIF-2 at ANY sample rate:
11.025k, 12k, 16k, 22.05k, 24k, 32k, 44.1k, 48k, 88.2k or 96kS/s
or
Dual AES at 88.2k, 96k, 176.4k or 192kS/s
or
Quad AES at 176.4 or 192kS/s
or
DSD SDIF-2, DSD SDIF-3 or DSD Quad
Figure 9 – General Sample Rate Conversion
The dCS 974 converts any one of 12 sample rates in any format to any of the 12
sample rates in ALL formats: 4 AES, 2 electrical SPDIF, optical SPDIF or
SDIF-2 outputs. Most frequency combinations (including all the primary ones)
are accommodated in one pass - see Table 2 on page 44. For best results,
slave the unit to the audio input, AES Ref Loop In or the SDIF-2 WCLK IN.
CH2 IN
LOOP OUT
CH2 OUT
WCLK OUT
REMOTE
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
do this: Connect any digital audio source of any word length between 8 and 24 bits,
using single AES or dual AES or quad AES to the AES inputs, or using single or
double speed SDIF-2 to the SDIF-2 inputs, or using single wire SPDIF to the
appropriate SPDIF input.
do this: Select Audio Input accordingly. Output via any of the outputs.
Sample Rate Conversion settings:
Sample Rate Conversion: On
Audio Input Select: Any, including Dual AES if the Input Sample
Rate is 88.2kS/s or more and Quad AES if the
Input Sample Rate is 176.4 kS/s
3
or 192kS/s.
Output Mode: Normal or Dual AES may be selected if the
Output Sample Rate is 88.2 kS/s or 96kS/s.
Dual AES or Quad AES must be used for
192 kS/s or 176.4 kS/s.
Other settings: Any.
3
It has to be Dual AES or Quad AES for 192 kS/s or 176.4 kS/s
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PCM to DSD
From PCM in ANY format: AES, SPDIF, Toslink or SDIF-2
at sample rates: 44.1k, 48k, 88.2k or 96kS/s
Dual AES at 88.2k, 96k, 176.4k or 192kS/s
Quad AES at 176.4 or 192kS/s
or
or
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
DSD Quad
AES / EBU REFERENCE LOOP SPDIF
IN OU T
AES CLK OUT SYNC INPUT
IN OUT
CH1 IN
RCA
BNC
TOS
WCLK IN
CH1 OUT
DSD / SDIF
LOOP IN
CH2 IN
LOOP OUT
CH2 OUT
WCLK OUT
REMOTE
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
DSD SDIF-2
or DSD SDIF-3
Figure 10 – PCM to DSD conversion
The dCS 974 converts PCM to DSD (including 176.4 kS/s to DSD) using the
arrangement given below:
do this: Connect any digital audio source of any wordlength between 8 and 24 bits,
using single, Dual or Quad AES to the AES inputs, or using single or double
speed SDIF-2 to the SDIF-2 inputs, or using single wire SPDIF to the
appropriate SPDIF input, and select the input accordingly.
do this: Set Output Mode to DSD SDIF-2 or DSD SDIF-3. Choose a Filter if you wish.
do this: Output SDIF-2 via the DSD/SDIF connectors, two data cables and one word
clock or SDIF-3 with just two data cables.
do this: Alternatively, take the DSD Quad output from the AES 1, 2, 3 and 4 outputs.
Sample Rate Conversion settings:
Sample Rate Conversion: On
Audio Input Select: Any, even including Dual AES or Quad AES at
higher Input Sample Rates
Sync Source:Any
Input Sample Rate:Any
Output Sample Rate:n/a
Output Mode: DSD
Filter:Any
Output Wordlength:n/a
Noise Shaping:n/a
Dither:n/a
Detect Silence:n/a
As an example, load Store H to take an input from AES1 and convert it to DSD
SDIF-2 or DSD Quad format.
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Using a Master Clock
DIGITAL OUT
16 bit / 44.1kS/s
digital audio
AES 1 AES 2 AES 3 AES 4
AES/EBU Outputs
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PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
CH1(L) CH2(R) S ensitivity
Analogue
AES / EBU INPUTS
AES / EBU OUTPUTS
CH1(L) CH2(R)
LL R R
WORDCLOCK IN
L
Hand Crafted by
The Red Hot CD Player Co.
R
44.1kS/s
Wordclock
1 2 3 4 5 6
External
7 8 9 10 11 12
Wordclock Outp uts
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
Reference In Re ference Out AES1 AES2 AES3 AES4 CH 1 CH 2
PUSH PUSH PUSH PUSH PUSH
Digital I/O
IN OUT
RCA
BNC
TOS
Dual AES up to
24 bit / 192kS/s
DSD / SDIF
Sync
CH1 IN
CH2 IN
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
LOOP IN
WCLK OUT
SDIF-2/DSD
In Out
75R
Clk
Master Clock
REMOTE
dCS 992
Mains Fuse (2AT)
On Off
dCS 974
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
DDC
In
Loop
Remote
Out
dCS 954 24/192 DAC
In
Remote
Out
MAINS FUSE 2A(T) ON OFF
Balanced
Analogue
Outputs
do this: connect the Master Clock to the AES Ref Loop In and select AES Loop Term
do this: connect the Master Clock to the SDIF-2 WCLK IN and select Wordclock as the
IMPORTANT!
Unbalanced
Analogue
Outputs
Figure 11 – Using a Master Clock
If a Master Clock such as a dCS 992 is available and the driving source is locked
to it, the dCS 974 may be locked to it. Either:
as the Sync Source,
or:
Sync Source.
Since the Output Sample Rate of the dCS 974 is different to the Master Clock
rate, the DAC would be unable to lock to the data from the dCS 974 if it were
sync’ed to the Master Clock. So, slave the DAC to the dCS 974, NOT to the
Master Clock.
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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Converting Quad AES to CD Format
24 bit / 176.4kS/s Quad AES
from 8-track recorder
AES / EBU INPUTS
PUSH PUSH PUSH PU SH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
16 bit / 44.1kS/s
(CD format)
You can archive in 24 bit / 176.4kS/s or 192kS/s Quad AES format using a
standard 8-track digital recorder, then convert to other formats such as Red
Book CD.
Sample Rate Conversion settings:
Optional 44.1kS/s Wordclock
to 8-track recorder
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
IN OUT
RCA
BNC
TOS
DSD / SDIF
CH1 IN
WCLK IN
CH1 OUT
LOOP IN
CH2 IN
LOOP OUT
CH2 OUT
WCLK OUT
REMOTE
Figure 12 – Converting Quad AES to CD format
Sample Rate Conversion: On
Audio Input Select: Quad AES
Sync Source: Audio Input
Input Sample Rate: Auto
Output Sample Rate: 44.1kS/s
Output Mode: Normal
Filter:Any
Output Wordlength: 16
Noise Shaping: 9th Order
Dither: NS Triangular
Detect Silence: On
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
Provided the Output Sample Rate is set to one quarter of the Input Sample
Rate (i.e 176.4kS/s ⇒ 44.1kS/s or 192kS/s ⇒ 48kS/s), you can reduce jitter by
using the dCS 974 as the master clock and locking the recorder to it. Change
Sync Source to Internal, connect WCLK OUT (lower block) to the recorder’s
Wordclock input and set the recorder to slave.
Archive at 176.4kS/s for audio-based material, archive at 192kS/s for videobased material. Ensure the sample rates match the source material.
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Multi-channel Sample Rate Conversion – bit aligned sources
96kS/s
Ch1 & 2
96kS/s
Ch3 & 4
96kS/s
Ch5 & 6
96kS/s
Ch7 & 8
44.1kS/s
SOURCE
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES CLK OUT SYNC INPUT
AES CLK OUT SYNC INPUT
AES CLK OUT SYNC INPUT
AES CLK OUT SYNC INPUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
IN OUT
IN OUT
IN OUT
IN OUT
CH1 IN
CH2 IN
REMOTE
REMOTE
REMOTE
REMOTE
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
IN
LOOP
OUT
MAINS FUSE (2AT) ON OFF
IN
LOOP
OUT
WCLK IN
RCA
BNC
TOS
RCA
BNC
TOS
RCA
BNC
TOS
RCA
BNC
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
LOOP IN
WCLK OUT
CH1 IN
CH2 IN
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
LOOP IN
WCLK OUT
CH1 IN
CH2 IN
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
LOOP IN
WCLK OUT
CH1 IN
CH2 IN
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
Figure 13 – Multi-channel Sample Rate Conversion with bit aligned source
If the source data is bit aligned (for example, from a multitrack recorder) up to
four or five dCS 974’s may be set to operate synchronously using the sync link
connections shown above, from one unit’s AES CLK Out to the next unit’s AES
Ref Loop In. For all units, set the Multiple Channel Sync option to On. The
top unit will set up as a master, the other ones will set up as slaves. Make sure
that all the other settings are the same on each unit.
See the section Multiple Channel Sync’ing, page 81 for how aligned is bit
aligned.
These are set up, for PCM in to DSD out, in Store E, and for PCM in to 96kS/s
out in Store F.
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dCS 974 User Manual Manual for Software Version 1.0x
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Multi-channel Sample Rate Conversion – Using a Master Clock
44.1kS/s
WORDCLOCK
TO RECORDER
44.1kS/s
SOURCE
AES 1 AES 2 AES 3 AES 4
AES/EBU Outputs
more@dcsltd.co.uk
A
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
AES / EBU OUTPUTS
AES / EBU INPUTS
PUSH PUSH PUSH PUSH PUSH
AES 1 AES 2 AES 3 AES 4
1 2 3 4 5 6
7 8 9 10 11 12
Wordclock Outp uts
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
AES / EBU REFERENCE LOOP SPDIF
IN OUT
AES CLK OUT SYNC INPUT
IN OUT
RCA
BNC
TOS
IN OUT
RCA
BNC
TOS
IN OUT
RCA
BNC
TOS
IN OUT
RCA
BNC
In
External
Loop
Sync
Out
CH1 IN
CH2 IN
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
LOOP IN
WCLK OUT
Remote
dCS 992
REMOTE
Mains Fuse (2AT)
On Off
Master Clock
IN
LOOP
OUT
MAINS FUSE ( 2AT) ON OFF
96kS/s
Ch1 & 2
96kS/s
CH1 IN
CH2 IN
REMOTE
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
LOOP IN
WCLK OUT
IN
LOOP
OUT
MAINS FUSE ( 2AT) ON OFF
Ch3 & 4
96kS/s
CH1 IN
CH2 IN
REMOTE
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
LOOP IN
WCLK OUT
IN
LOOP
OUT
MAINS FUSE ( 2AT) ON OFF
Ch5 & 6
96kS/s
CH1 IN
CH2 IN
REMOTE
WCLK IN
LOOP OUT
CH1 OUT
CH2 OUT
DSD / SDIF
IN
LOOP
OUT
Ch7 & 8
Figure 14 – Multi-channel Sample Rate Conversion with Master Clock
You can use a dCS 992 Master Clock
4
to sync up the source and be the master.
The sync link cabling starts from the master clock (cable “A”) and then carries
on down units as shown. Use of the master clock allows more units to be used
together – 24 channels worth or more. For all dCS 974 units, set the Multiple
Channel Sync option to On. They will all set up as slaves. Make sure that all
the other settings are the same on each unit.
4
version 2.0 or higher software
Manual part no: DOC1241121A1
Contact
on + 44 1799 531 999 email to: more@dcsltd.co.uk
dCS
Page 30
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
Document No: OS-MA-A0124-112.1A1
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