Issue 4, October 2016
Model 760-03/77 User Guide
Page 40
Studio Technologies, Inc.
for Surround
management function requires the source
to have a sample rate of 44.1, 48, 88.2, or
96 kHz.) Selecting a source with a sample
rate of 44.1, 48, 88.2, or 96 kHz will re-
solve the issue and normal operation will
resume. Refer to the Technical Notes sec-
tion of this user guide for additional details.
Downmix
Two downmix functions allow users to per-
form “real-world” audio format compatibility
checks. One function allows a surround
(5.1) signal to be “folded down” (mixed) to
stereo. The other allows a stereo signal to
be converted to mono. Using the downmix
functions simply requires pressing the de-
sired button. The buttons are set to always
“latch” the functions on and off. An LED is
located adjacent to each button and lights
whenever its respective function is active.
The downmix functions always impact the
post-fader surround and stereo digital and
analog monitor outputs. And, depending on
the selected configuration, they may also
impact the pre-fader surround digital moni-
tor output.
A specific downmix function can only be
enabled when it is applicable for the cur-
rently selected input source. This means
that the surround to stereo downmix func-
tion can only be enabled when surround
input A or B is selected.
The Model 77 associates the state of the
downmix functions with the currently se-
lected input. For example, if surround input
A is the selected input source and the sur-
round to stereo downmix function is en-
abled, this condition will be “remembered”
when switching to one of the stereo input
sources. Upon returning to surround input
A, the surround to stereo downmix function
will again become active. For details on the
exact actions performed by the downmix
functions refer to Appendix C at the end of
this user guide.
Surround to Stereo
When the surround to stereo downmix
function is enabled the LS, RS, and C
channels associated with a surround
source are combined (“folded down”) with
the L and R signals to create a 2-channel
stereo (left and right) signal. And, depend-
ing on the system’s configuration, the LFE
channel may also be combined with the L
and R signals. The resulting stereo sig-
nal, sometimes known as LtRt, is routed
to the L and R post-fader surround digi-
tal and analog monitor output channels.
Also, whenever the surround to stereo
downmix function is enabled the C, LS,
RS, and SUB digital and analog monitor
output channels are muted. By utilizing this
downmix function phase relationships and
inter-channel level issues can be quickly
observed.
Stereo to Mono
The stereo to mono downmix function
combines the L and R audio channels to
create a single-channel monaural signal.
This signal is sent out the C surround
digital and analog monitor output channels
while the L, R, LS, RS, and SUB digital
and analog monitor output channels are
muted.
When a surround source has been select-
ed for monitoring, the surround to stereo
downmix function will automatically enable
whenever the stereo to mono downmix
function is enabled. This ensures that a
user will hear a mono signal created by
folding down all channels associated with
the selected surround input.
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