Studio Technologies 780-03 V.4.15 - Manual (Page 22)

Issue 1, April 2015 Model 780-03/790 User Guide
Page 22 Studio Technologies, Inc.
for Surround
Stereo downmix function is active, LFE is
reduced in level by 6 dB and routed to both
the left (L) and right (R) post-fader digital
and analog monitor outputs. When in this
mode and the To Mono downmix function is
active the level of the LFE channel is re-
duced by 6 dB and routed to the center (C)
channel of the post-fader digital and analog
monitor outputs.
Pre-Fader Digital Monitor
Output Mode
The pre-fader digital monitor output can
be configured as to its place in the Model
780-03’s signal flow. The choices are pre- or
post-downmix. In the pre-downmix mode
the pre-fader digital monitor output chan-
nels will not be impacted by the state of the
three downmix functions. This setting would
be appropriate if the pre-fader digital moni-
tor outputs were being routed to a storage
system, routed to another facility, etc. In this
case the action of a user enabling or dis-
abling the downmix functions won’t impact
the level of the pre-fader digital monitor
output channels. If the post-downmix mode
is selected the pre-fader digital monitor
outputs will reflect the actions of the down-
mix functions. This choice would be correct
if, for example, level meters were connected
to the pre-fader digital monitor outputs. In
this scenario a user would want to visually
observe the actions that the downmix func-
tions impart on the signals. By default the
pre-fader digital monitor outputs are config-
ured to be pre-downmix.
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
sources and associated channels 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 example, 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 790 will result in
an actual 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 user
during normal system operation. The default
value for both delay A and delay B is 0 mil-
liseconds. Typical applications would require
only one input delay to be configured. But
in other cases two different, both non-zero,
input delay values can be selected. This
could be appropriate in applications where
multiple video display systems are being
used in the same control room or monitor-
ing facility. Each video display may exhibit
its own processing latency and audio would
need to be “lined up” accordingly. During
normal StudioComm operation a user can
select the appropriate input delay for the
display system currently being utilized.
Post-Fader Digital and Analog
Monitor Output Level Offsets
To provide assistance during room calibra-
tion, the relative output levels of the post-
fader digital and analog monitor output
channels can be adjusted over a limited
range. The eight channels can be adjusted
in 0.5-dB steps over a ±12-dB range. The
default, of course, is 0 dB for all channels.
During configuration the displayed value
represents the dB level difference as com-
pared to the nominal output level. In most