User Guide

Model 780-01/790 User Guide Issue 4, December 2020
Studio Technologies, Inc. Page 17
for Surround
As a user aid, a Model 790 that has entered
the configuration mode will have its mode
mute and mode solo LEDs (associated with
the input mute/solo section) light in an alter-
nating manner. Other connected Model 790
units will indicate that they have entered the
standby mode by simultaneously flashing
their mode mute and mode solo LEDs.
To leave the configuration mode and return
the system to normal operation requires a
final action to be made. On the Model 790
unit that’s in its configuration mode press
and hold its configure button for two sec-
onds. At this time any configuration changes
will be stored in nonvolatile memory and
normal operation, using the stored configu-
ration settings, will resume.
Our apologies to those of you who find the
configure button a pain to use, but it’s sup-
posed to be that way! Seriously, the top of
the button is slightly recessed from the back
panel, making accidental activation unlikely.
We didn’t want normal operation to cease
because someone pushed a Model 790
into a “rats nest” of schedules, memos from
management, and empty coffee cups! But
a firm press with the fleshy part of an index
finger should do the trick.
There is no problem frequently “tweak-
ing” the StudioComm system’s operating
parameters to achieve the desired perfor-
mance. The configuration data is stored
in nonvolatile memory, which is rated for
many thousands of read and write cycles
and a retention time in tens of years. Note
that memory integrated circuits are located
in the Model 780-01 Central Controller as
well as the Model 790 and Model 71 Control
Consoles. Only the individual device ad-
dresses are stored in each Model 790 and
Model 71. All other configuration param-
eters are stored in the Model 780-01.
Model 790 Device Address
A unique device address must be assigned
to each Model 790 Control Console that is
connected to a Model 780-01. The address
choices are A1, A2, A3, or A4, with the
default address being A1. As most installa-
tions will utilize only one Model 790 its de-
fault setting is appropriate. For installations
that use two, three, or four Model 790 units
it’s important that each be configured with
a unique device address. Problems will
occur if more than one unit has the same
address. It’s important to highlight the fact
that the device address is the only set-
ting that must be done on each individual
Model 790 unit. All other settings can be
made on any one of the connected Model
790 units. Be sure that any selected ad-
dress does not conflict with addresses that
are, or will be, assigned to Model 71 units.
Stereo Input Sample Rate
Converter
Circuitry associated with the stereo input
can provide sample rate conversion (SRC)
for digital audio signals connected to that
input. The acceptable input range for
sample rate conversion is very wide, but
is dependent upon the output sample rate.
With an output sample rate of 48 kHz any
signal with a sample rate over a range of 8
to 216 kHz can be properly monitored by
the system. This capability can be espe-
cially useful with signals that are not syn-
chronized with respect to the other signals
that are connected to the Model 780-01,
even if their sample rates are identical.
The only compromise is that the SRC pro-
cess adds a fixed input-to-output (group)
delay of approximately 1 millisecond, a val-
ue that shouldn’t impact most applications.
By default SRC is enabled and it’s recom-
mended that it remains that way. However