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dCS 974 User Manual Manual for Software Version 1.0x
dCS Ltd May 2001
Manual part no: DOC1241121A1
Page 13
Document No: OS-MA-A0124-112.1A1
Contact
dCS
on + 44 1799 531 999 email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
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 re-
locks.
do this: Proceed to Step 3.