Studio Technologies 76D 2014 - Manual (Page 48)

Issue 11, May 2014 Model 76D/77 User Guide
Page 48 Studio Technologies, Inc.
for Surround
Model 76D communicates with each Model
77 and Model 71 unit 20 times per second,
receiving button and rotary level control
information and sending LED and 4-digit
display status data.
“Hot” Disconnection of
Control Consoles
There’s no problem relocating one or more
Model 77 or Model 71 Control Consoles
while the StudioComm system is operat-
ing. You can disconnect the 9-pin intercon-
necting cable, move the unit (or units),
and then reconnect without issue. Upon
disconnection of all control consoles the
Model 76D Central Controller will mute the
internal digital audio channels as well as
saving the current operating parameters.
No clicks, pops, or other noises will occur
when the Model 77 or Model 71 units are
again connected. The control consoles
will go through their standard power-up
sequence and then normal operation will
resume.
Channel Status, User, and
Validity Bits
The non-audio bits that are part of the
AES3 digital audio monitor output channel
data are actively controlled by the Model
76D’s software. The Channel Status bits
use the Professional Use of Channel Sta-
tus block. They indicate a word length
of 24 and the current sample rate. The cor-
rect CRC is also calculated and inserted.
The User bits are always set to 0. When
a valid timing reference (sync) source is
recognized by the system the Validity bits
will be set to 1.
The Model 76D’s hardware is capable of
routing the C/U/V bit information from any
of the L/R inputs, as well as the sync input,
to the main logic device (FPGA) and then
on to the digital audio transmitter (DIT) in-
tegrated circuits. This is provided for future
use and is not active at this time.