DigiDesign 882/20 Manual de instalação - Página 7
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4. Sample Rate
These LEDs display the current sample rate
of the 882/20 I/O internal crystal oscilla-
tor, which can be either 44.1 kHz or 48
kHz. In Pro Tools, this is set in the Session
Setup window.
The 882/20 I/O provides the following
sample rates:
48 kHz This is a standard sampling rate of
many professional audio devices. It is rec-
ommended for use with devices that can-
not receive digital transfers at 44.1 kHz.
44.1 kHz This is the compact disc standard
sampling rate and the Pro Tools default
sample rate. To avoid the need for sample
rate conversion, you should use this rate
when you are recording material that will
ultimately be published on a compact disc.
When you are using an external digital
source such as a DAT recorder, the front panel
of the 882/20 I/O indicates only the internal
oscillator sample rate, not that of the external
digital source.
5. Signal Present LEDs
These LEDs indicate whether signal is
present (above the level of –30 dB) at a
given channel's output. These LEDs indi-
cate the presence of channel output sig-
nals, not input signals. Input signals are
monitored on-screen in the Pro Tools soft-
ware. The LEDs do not indicate clipping.
Clipping is indicated by the on-screen
meters in Pro Tools software.
882/20 I/O Back Panel
The 882/20 I/O has the following back
panel connectors, moving from left to
right:
Back panel of the Digidesign 882/20 I/O
1. Analog Audio Inputs
These are balanced, 1/4-inch TRS jacks for
analog audio input connections. The
882/20 I/O analog inputs feature 20-bit an-
alog-to-digital converters.
Input operating levels are switchable be-
tween +4 dBu and –10 dBV operation. Un-
balanced connections are supported with
the use of standard 1/4-inch mono phone
plugs.
Because input channels 1–2 of the
882/20 I/O are software selectable between
analog or S/PDIF digital format, input to
these two analog channels is disabled
when S/PDIF digital input format is chosen
in the Pro Tools Hardware Setup dialog.
The 882/20 I/O analog inputs are factory
calibrated at a –14 dB nominal level, refer-
enced to a full code signal. This means that
at the nominal reference input level (either
+4 dBu or –10 dBV), you have 14 dB of
headroom before clipping.
Using the 882/20 I/O 3