DCS dCS 974, Digital to Digital Converter Step 2 – Setting the Sync Source, Set, WCLK IN, do this:, Unlocked, do this:, do this:, do this:, LOOP OUT, do this:, Unlocked, do this:, TOP LEVEL

dCS 974 User Manual	Manual for Software Version 1.0x
dCS Ltd	May 2001

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		Default
Sync Source	Audio Input
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
do this:	48kS/s).
	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.

Manual part no: DOC1241121A1 Page 13 Document No: OS-MA-A0124-112.1A1

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