Creative 0404 PCIe Manuel du propriétaire Page 97

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6 - Appendix
Getting in Sync
E-MU Digital Audio System 97
6 - Appendix
Getting in Sync
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 (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:
External S/PDIF Sync
S/PDIF Out
S/PDIF In
PatchMix DSP supplies Master Clock
(via S/PDIF)
Set PatchMix DSP to receive:
External S/PDIF Sync
S/PDIF Out
External Device supplies Master Clock
(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.
Master
Slave
Master
PatchMix DSP
Slave
External A-D Converter
External A-D Converter
or
S/PDIF
(Coax)
S/PDIF
(Optical)
In
Out
In
Out
PatchMix DSP
or
S/PDIF
(Coax)
S/PDIF
(Optical)
In
Out
In
Out
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