DCS Computer Hardware dCS 974 Benutzerhandbuch
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.
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.
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 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:
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).
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.
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 75
a 75
Ω 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.
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.