Studio Technologies 76D V.2.02 - Manual (Page 6)

Issue 2, June 2009 Model 76D/77 User Guide
Page 6 Studio Technologies, Inc.
for Surround
Figure 1. Model 76D Central Controller Front Panel
Figure 2. Model 76D Central Controller Back Panel
Sync status
LED
Control console
status LED
Sync
Input
connection
Digital
monitor
output
connections
To/from
Models 77 &
71 Control
Consoles
AC mains input
connection
RS-485 and
remote control
inputs
Surround Input B
connections
Surround Input A
connections
Stereo Input A and
Stereo Input B
connections
Stereo
Input C
connection
clock, DARS (AES11), AES3id, bi-level
video, or tri-level video signal.
Two surround (5.1) and two stereo moni-
tor outputs are provided. The post-fader
surround and stereo monitor outputs are
intended for connection to monitor loud-
speaker systems. The pre-fader surround
monitor output can be used with metering
systems that require signals that aren’t
impacted by level control or other monitor-
ing functions. The stereo input C direct
monitor output allows an installation to
directly access the SRC capabilities.
For installation flexibility the outputs can
be configured for compatibility with equip-
ment that requires AES3 (“balanced”)
or AES3id (“unbalanced”) digital audio sig-
nals. When selected for AES3 compatibility
the output impedance is 110 ohms with
a 5 volts peak-to-peak (Vpp) level. For
AES3id operation the impedance 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
preserved. All audio processing is per-
formed in 32 bits using a high-speed
field-programmable gate array (FPGA)
integrated circuit. A dynamic range of
greater than 123 dB is provided with less
than 1 dB of input-to-output noise added.
The Model 76D occupies one space (1U)
in a standard 19-inch rack. Digital audio
signals are interfaced with the Model 76D
using nine BNC connectors. Monitor out-
put signal connections are made using
one 25-pin D-subminiature connector. One
9-pin D-subminiature connector is used
to connect the Model 76D with up to four
Model 77 or Model 71 Control Consoles. A
second 9-pin “D-sub” connector is used to
interface with remote control signals. AC
mains power is connected directly to the
Model 76D, with an acceptable range of
100 to 230 volts, 50/60 Hz.