DigiDesign 882/20 Manuale di installazione - Pagina 6
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Internal This is the 882/20 I/O standard
setting. In this mode, the 882/20 I/O sam-
ple rate is generated by its internal crystal
oscillator (whose frequency is determined
by the Sample Rate setting in the Session
Setup window). Internal mode should be
active whenever the 882/20 I/O is not syn-
chronized to an external clock source.
Digital This setting indicates that a S/PDIF
word clock signal is the source for the
882/20 I/O sample rate. This is the setting
you would use for inputting material from
DAT machines or other S/PDIF digital de-
vices.
To use the 882/20 I/O digital input and
output as an effects send and return to a
digital effects device, you should set the
882/20 I/O to Internal Sync Mode. You
should then set the digital effects device to
accept an external digital clock (from the
882/20 I/O) so it synchronizes with
Pro Tools.
In an expanded system, the system clock is
carried by the Audio Interface connected
to the first Pro Tools card in your system.
This Audio Interface will act as the master
interface in your system, and all other Au-
dio Interfaces will be slaved to it. Only the
master interface allows you to set the Sync
Mode. Slaved interfaces do not allow this
parameter selection.
Because some digital audio devices do not
output proper clock when they are not playing
back, leaving the 882/20 I/O in Digital Sync
Mode may cause Pro Tools audio playback
quality to suffer, or to play back at the wrong
pitch. If you are using digital I/O, reset the
Sync Mode from Digital to Internal after input-
ting material.
2
882/20 I/O
Slave This LED is lit when the 882/20 I/O
sample rate is synchronized to another
Digidesign Audio Interface or synchroniza-
tion peripheral. In this mode, the sample
rate of the slave interface is derived from
the frequency of the incoming master
clock signal present at the Slave Clock
(256x) port. The 882/20 I/O automatically
switches to this mode when a Slave Clock
Out signal from another Digidesign Inter-
face, Universal Slave Driver, Video Slave
Driver, or SMPTE Slave Driver is connected
to its Slave Clock In port.
In expanded Pro Tools systems, the Super
Clock output of the master Audio Interface
locks all other interfaces together with
sample accuracy, keeping all signals
phase-synchronous.
When slaving to a Digidesign Universal
Slave Driver, Video Slave Driver, or SMPTE
Slave Driver, set the clock source to Internal.
The Audio Interface will automatically switch
to Slave mode when it detects the 256x input
clock.
3. Ch 1–2 Input
This LED indicates the format (analog or
digital) of the audio input signal to chan-
nels 1 and 2. In Pro Tools, you choose ana-
log or digital input for these two channels
in the Session Setup window. Input chan-
nels 3 through 8 of the 882/20 I/O are al-
ways analog.