Synchronizing The 0404 With Other Digital Devices - E-Mu 404 Owner's Manual

E-MU USB Audio Control Panel
NOTE to PC Users:
S/PDIF is only available for
recording via ASIO and
Kernal Streaming, you
cannot record S/PDIF with
MME applications.
20

Synchronizing the 0404 with other Digital Devices

When interconnecting two digital audio devices using a digital interface such as
S/PDIF, the two devices must be properly synchronized. Unsynchronized digital
audio will result in random clicks, pops and dropouts, or even no audio at all.
• The digital audio input is UNSYNCED if BOTH Sync Status LEDS are on.
• The internal and external sample rates are mismatched if the "Ext" LED is
flashing.
Two digital devices are properly synchronized when one unit is supplying the
master clock to the other unit (the slave) and the slave is set to receive external
clock. Make sure you set the sync source to External and set the sample rate to
match the external device in the E-MU 0404 USB Control Panel. The diagrams
below show two ways to synchronize an external device.
External Device supplies Master Clock
0404 USB 2.0
Slave
S/PDIF
The S/PDIF cable carries two
(Optical)
channels of audio data and
In Out
an embedded clock.
or
In Out
Master
S/PDIF
(Coax)
Set 0404 USB 2.0 to receive:
External Sync
0404 USB 2.0
Master
This S/PDIF cable carries two
S/PDIF
channels of audio data.
(Optical)
In Out
Slave
In Out
S/PDIF
(Coax)
This S/PDIF cable carries an embedded
clock signal from 0404 USB 2.0.
The Sync Status indicators on the 0404 USB 2.0 function as follows:
INT solid ................................Internally sync'd, no external digital input detected.
INT solid + EXT blinking ....Internally sync'd, external digital input of different
INT solid + EXT solid ...........Internally sync'd, external digital input of same
EXT solid ...............................Externally sync'd; valid S/PDIF input present
(via S/PDIF)
S/PDIF Out
External A-D Converter
(or other digital audio device)
0404 USB 2.0 supplies Master Clock
(via S/PDIF)
S/PDIF Out
S/PDIF In
External A-D Converter
(or other digital audio device)
sample rate detected; MUTE S/PDIF input
sample rate detected.
Set this device to receive:
External S/PDIF Sync
E-MU Systems