Model 760-03/77 User Guide
Issue 4, October 2016
Studio Technologies, Inc.
Page 23
for Surround
are being used in the same control room
or monitoring facility. Each video display
may exhibit its own processing latency and
audio would need to be “lined up” accord-
ingly. During normal StudioComm opera-
tion a user can select the appropriate 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
760-03 handles the surround to stereo
downmix function can be selected by way
of four configurable parameters. The default
settings create a good general-purpose
function 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)
input channel to the left post-fader output
channel and the right (R) input channel 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
remain at unity, with no gain or loss applied.
An alternate setting allows the level of
L and R input channels to be reduced
(attenuated) by 3 dB. (The available chang-
es in signal level can also be notated as
0 dB or –3 dB.)
When the surround to stereo downmix
function is active the left surround (LS) in-
put is routed to the left (L) post-fader moni-
tor outputs; the right surround (RS) input
is routed to the right (R) post-fader moni-
tor outputs. By default the level of the LS
and RS signals routed to L and R will be
reduced (attenuated) by 3 dB. An alternate
setting allows the levels to be reduced by
6 dB. (These settings can also be notated
as –3 dB and –6 dB.)
When the surround to stereo downmix
function is active the center (C) input is
routed to both the left (L) and right (R)
post-fader monitor outputs. By default the
level of the C signal routed to L and R will
be reduced (attenuated) by 6 dB. An alter-
nate setting allows the attenuation level to
be 3 dB. (These levels can also be notated
as –3 dB and –6 dB.)
By default, when the surround to stereo
downmix function is active the LFE chan-
nel associated with a surround input is
fully attenuated (muted). This removes
LFE content from the “downmixed” signal.
In most applications this is appropriate.
However, for special situations a configura-
tion mode allows the LFE channel to be
reduced by 6 dB and routed to both the
left (L) and right (R) post-fader monitor
outputs.
A last word on configuring the surround to
stereo downmix function: no matter what
choices are made when the function is ac-
tive the center (C), left surround (LS), right
surround (RS), and subwoofer (SUB) post-
fader monitor outputs will fully mute.
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