Studio Technologies 76DA V.3.01 - Manual (Page 6)

Issue 2, April 2011 Model 76DA/77 User Guide
Page 6 Studio Technologies, Inc.
for Surround
Figure 1. Model 76DA Central Controller Front Panel
Figure 2. Model 76DA Central Controller Back Panel
Sync status
LED
Control console
status LED
Sync
Input Digital
monitor
outputs
To/from
Models 77 &
71 Control
Consoles
AC mains input
Remote control
inputs
Surround Input B
Surround Input A
Stereo Input A and
Stereo Input B
Stereo
Input C
delays in an associated video path. A
number of different signals can serve as
the Model 76DA’s digital audio timing refer-
ence. For synchronization with a master
timing reference a dedicated source of
word clock, DARS (AES11), bi-level video,
or tri-level video can be connected. Alter-
nately, the L/R connection of the actively
selected surround or stereo input source
can serve as the timing reference.
A range of digital and analog surround
(5.1) and stereo monitor outputs are pro-
vided. The post-fader surround and stereo
digital and analog monitor outputs are
intended for connection to monitor loud-
speaker systems. The pre-fader surround
digital monitor output can be used with
metering systems that require signals that
aren’t impacted by level control or other
monitoring functions. The stereo input C
direct digital monitor output allows an
installation to directly access the SRC
capabilities.
For installation flexibility the digital monitor
outputs can be configured for compatibility
with equipment that requires AES3 (“bal-
anced”) or AES3id (“unbalanced”) digital
audio signals. When selected for AES3
compatibility the output impedance is 110
ohms with a signal level of 5 volts peak-to-
peak (Vpp). For AES3id operation the im-
pedance is 75 ohms and the level is 1 Vpp.
Great care was taken in designing the
system’s architecture, ensuring that the
character of the audio input signals is pre-
served. All audio processing is performed
in 32 bits using a high-speed field-program-
mable gate array (FPGA) integrated circuit.
The Model 76DA occupies one space (1U)
in a standard 19-inch rack. Digital audio
sources are interfaced with the Model 76DA
using nine BNC connectors. A tenth BNC
connector is used by the sync source.
Digital and analog monitor output signal
connections are made using two 25-pin
D-subminiature connectors. One 9-pin
Analog
monitor outputs