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7 - Appendix<br />
Word Clock In/Out<br />
To Synchronize PatchMix DSP to an External Clock Source:<br />
1. Make sure an external clock source is connected to the E-MU Digital Audio System<br />
hardware via the word clock or S/PDIF input.<br />
2. Open the Session Settings dialog box.<br />
3. Under the System tab, select External Source, then select either Word Clock or<br />
S/PDIF.<br />
4. Press OK to close the dialog box.<br />
5. Check the Sync section of PatchMix DSP to verify that the Locked indicator is<br />
illuminated.<br />
Devices can be connected in daisy chain fashion (word clock out connected to the next<br />
unit’s word clock in) or in parallel for one or two devices, but professional digital<br />
studios normally use a master word clock generator or “House Sync” with a distribution<br />
system so that each device receives a phase-coherent and jitter-free word clock.<br />
House Sync<br />
Generator<br />
Digital<br />
Device 1<br />
Digital<br />
Device 2<br />
A master word clock generator is preferable for larger digital setups.<br />
Digital<br />
Device 3<br />
Digital<br />
Device 4<br />
Word Clock In: Receives word clock (sample clock) from another digital device such as<br />
a digital video deck, digital recorder or digital mixer.<br />
Word Clock Out: Sends word clock (sample clock) to another digital recorder. Word<br />
clock is always output, whether it is generated by the internal clock or passed through<br />
from the word clock input.<br />
75Ω On/Off: Termination for the word clock input can be switched on or off in the<br />
Sync Card menu of the PatchMix DSP application. Normally word clock termination<br />
should be left on. If you have problems with a weak word clock signal, try turning termination<br />
off. See Word Clock Termination.<br />
The diagram below shows the proper way to connect and terminate a serial word clock<br />
chain. Using a BNC “T” connector ensures that word clock is precisely in phase for both<br />
devices. The middle device has termination turned Off and the last device in the word<br />
clock chain has termination turned On.<br />
74 <strong>Creative</strong> Professional