Remote mute all, Remote dim, Input delay – Studio Technologies 76DA V.4.12 User Manual
Page 23: Surround to stereo downmix levels
Model 76DA/77 User Guide
Issue 9, May 2014
Studio Technologies, Inc.
Page 23
for Surround
Remote Mute All
Two configuration choices are associated
with the remote mute all function: disabled
and enabled. To utilize the remote mute all
function simply requires you to select the
enabled setting.
Remote Dim
Two configuration choices are associated
with the remote dim function: disabled and
enabled. To utilize the remote dim function
simply configure it for enabled.
Input Delay
A time delay can be added to the input
signals, allowing compensation for delays
that may be present on associated video
signals. The time delay applies to all input
signals and cannot be applied selectively.
A configured delay time is referenced to a
sample rate of 48 kHz. In the case of input
signals with a sample rate of 48 kHz the
delay range is 0 to 340 milliseconds in
1-millisecond steps. For other sample rates
the time must be linearly scaled. For exam-
ple, for a sample rate of 96 kHz the actual
time range is 0 to 170 milliseconds. In this
case selecting a delay of 120 on the Model
77 will result in an actual time delay of 60
milliseconds. For 192 kHz sampling the
time range is 0 to 85 milliseconds. Select-
ing a delay of 240 will result in a time delay
of 60 milliseconds.
For operating flexibility two different input
delay values can be selected and stored
during the configuration process. These
can then be enabled as required by the
operator during normal system operation.
The default value for both Delay A and
Delay B is 0 milliseconds. Typical applica-
tions would require only one input delay
to be configured. But in other cases two
different, both non-zero, input delay values
will be selected. This could be appropriate
in applications where multiple video display
systems are being used in the same con-
trol room or monitoring facility. Each video
display may exhibit its own processing
latency and audio would need to be “lined
up” accordingly. During normal StudioComm
operation an operator can select the ap-
propriate input delay for the display system
currently being utilized.
Surround to Stereo Downmix
Levels
The surround to stereo downmix function is
a useful tool for checking the compatibility
of surround (5.1) input signals with stereo
and monaural playback environments. The
exact technical formula for how the Model
76DA handles the surround to stereo down-
mix function can be selected by way of four
configurable parameters. The default set-
tings create a good general-purpose func-
tion that’s effectively used by numerous
users of Studio Technologies’ StudioComm
for Surround products. But there are ap-
plication-specific situations where modify-
ing one or more of the parameters will be
appropriate. This can be in response to a
personal choice in monitoring methods or,
more frequently, to meet the requirements
of international broadcast standards.
When the surround to stereo downmix
function is active the path from the left (L)
channel input to the left post-fader output
channel and the right (R) channel input to
the right post-fader output channel is main-
tained. A configuration choice allows the
level of the L and R inputs routed to the
L and R outputs to be selected. By default,
when the surround to stereo downmix func-
tion is active the level of the L and R inputs