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6 - Appendix
Getting in Sync

78

Creative Professional

Whenever you connect external digital audio devices together, you need to be aware of 
how they are synchronized to each other. Simply connecting digital out to digital in 
doesn’t guarantee that two digital devices are synced, even if audio is being passed. 
Unless you have set one to be the Master and the other a Slave, they are probably NOT 
synchronized and the quality of your audio will suffer.

S/PDIF is probably the most common digital audio format. S/PDIF carries an 
embedded word clock which can be used to synchronize the digital equipment. You 
must enable “External Clock” on the slave device to have clock sync!

The diagrams below show two ways to synchronize an external A/D converter to the 
E-MU Digital Audio System using the S/PDIF connection.

In the first example, the external A/D converter is the master clock for the system. Only 
one S/PDIF cable is needed (either optical or coaxial) as long as PatchMix is set to 
receive its word clock signal from the external device. The external A/D is the Master and 
the E-MU DAS is the Slave.

In the second example a second S/PDIF cable is used to supply “embedded word clock”. 
The external device MUST be set to receive external clock via S/PDIF or the units will not 
be synchronized. The E-MU Digital Audio System is the Master and the external A/D is 
the Slave.

Set External Device to receive:  

S/PDIF Out

S/PDIF In

(via S/PDIF)

Set PatchMix DSP to receive:  
External S/PDIF Sync

S/PDIF Out

(via S/PDIF)

This S/PDIF cable carries an

embedded clock signal.

The S/PDIF cable carries two

channels of audio data and

an embedded clock.

This S/PDIF cable carries two

channels of audio data.

(Coax)

(Optical)

In

Out

In

Out

(Coax)

(Optical)

In

Out

In

Out