Studio Technologies 76DBA V.3.00 - Manual (Page 10)

Issue 1, November 2010 Model 76DBA/77B User Guide
Page 10 Studio Technologies, Inc.
for Surround
Audio Connections
Audio connections are made by way
of nine BNC jacks and two 25-pin
D-subminiature connectors. All the con-
nectors are located on the Model 76DBA’s
back panel. Refer to Figure 2 for a detailed
view of these jacks and the connector.
Digital Audio Inputs
Two surround (5.1) and three stereo
digital audio sources can be connected.
All sources can be monitored using the
pre- and post-fader surround digital and
analog monitor output channels. A one-to-
one relationship is maintained between the
input and output channels, i.e., left input to
left monitor output, right input to right mon-
itor output, center input to center monitor
output, etc. (Of course this won’t be true in
the case where the user has enabled one
or both of the downmix functions.) Stereo
input C is also routed to the stereo input C
direct digital and analog monitor outputs.
The digital audio inputs support digital
audio signals with a sampling rate of up to
192 kHz and a word length (depth) of up
to 24 bits. It’s best if the connected signal
sources maintain a common sample rate
and timing reference. Having all signals
“locked” together helps to ensure proper
handling by the Model 76DBA’s all-digital
signal control path.
There is, however, an exception worth
noting. Circuitry associated with stereo
input C has sample rate conversion (SRC)
capability, allowing virtually any digital
audio signal to be connected. A signal
connected to stereo input C can have an
independent sample rate and timing refer-
ence and still be monitored correctly. Refer
to the Technical Notes section of this guide
for a detailed review of the SRC capability.
Stereo inputs A and B can be configured to
be used as a stereo source or as two inde-
pendent monaural sources. When config-
ured as a stereo source the left channel is
routed to the left monitor outputs and the
right channel to the right monitor outputs.
Alternately, the left and right input channels
can be independently configured to output
by way of the center channel of the sur-
round monitor outputs. In this way a single
2-channel digital audio source can supply
one or two monaural signals to the Studio-
Comm system and be correctly monitored.
Stereo input C can serve as a source for
the pre- and post-fader surround digital and
analog monitor outputs. As with the other
inputs, stereo input C can be assigned,
using the configuration function, to an input
select button. This will allow stereo input
C to be monitored using the left and right
channels of the surround digital and analog
monitor outputs.
In addition, the signal connected to stereo
input C will be routed to the auxiliary stereo
digital and analog monitor outputs when-
ever that function is active. To clarify: if the
auxiliary stereo digital and analog moni-
tor outputs are enabled a signal on the left
channel of stereo input C will be present on
the left channel of the auxiliary stereo moni-
tor outputs; a signal on the right channel of
stereo input C will be present on the auxil-
iary stereo monitor outputs’ right channel.
Stereo input C is also routed to the stereo
input C direct digital monitor output. A one-
to-one channel mapping scheme is main-
tained. The signal present on the stereo
input C direct digital monitor output is post
(after) the sample rate conversion (SRC)
and input delay functions but pre (before)
the downmix, level control, and on/off
functions.