Studio Technologies 761 - Manual (Page 30)

Issue 1, March 2008 Model 761/771 User Guide
Page 30 Studio Technologies, Inc.
for Surround
stereo. The other allows a stereo signal to
be converted to mono. Using the down-
mix functions simply requires pressing the
designated buttons. The buttons are set to
“latch” the functions on and off. An LED is
located adjacent to each button and lights
whenever its respective function is active.
When the 5.1 to stereo downmix func-
tion is enabled the LS and RS channel’s
associated with a 5.1 surround signal is
combined (“folded down”) with the L and
R signals to create a 2-channel stereo
(left and right) signal. The resulting stereo
signal is routed to the left and right moni-
tor output channels. The LS, RS, and LFE
monitor output channels are muted. By uti-
lizing this downmix function phase relation-
ships and inter-channel level issues can be
quickly observed.
The stereo to monaural downmix function
combines the left and right audio channels
to create a single-channel monaural signal.
This signal is sent to the center channel
monitor output. The L, R, LS, RS, and LFE
channels are muted. Please refer to the
Technical Notes section of the guide for a
detailed description on how the downmix
functions perform their tasks.
Note that when a 5.1 surround source is
selected as the input source, the 5.1 to
stereo downmix function will automati-
cally enable whenever the stereo to mono
downmix function is enabled. This ensures
that an operator will hear a mono signal
created by folding down all channels as-
sociated with the selected input.
The Model 771 associates the state of
the downmix functions with the currently
selected input. For example, if HD primary
is the selected input source and 5.1 to
stereo downmix is enabled, that condition
will be “remembered” when switching to
another input source. Upon returning to
HD primary as the input source, the 5.1 to
stereo downmix function will again become
active.
Note that a specifi c downmix function can
only be enabled when it is applicable for
the currently selected input source. This
means that the 5.1 to stereo downmix
function can only be enabled when a 5.1
surround input source is selected. Neither
of the downmix functions can be enabled
when one of the SAP or international input
sources is selected. This is because these
inputs are already monaural and wouldn’t
be subject to any additional fold down.
Monitor Output General
Functions
Four buttons and one rotary control are
associated with the monitor output func-
tions. The buttons control operation of the
dim, mute all, reference level, and dialnorm
enable functions. The rotary level control
is used to manually set the monitor output
level.
Dim
The dim function is provided for user
convenience, allowing the monitor output
level to be reduced by a fi xed amount. The
Model 771’s confi guration mode allows the
dim level to be selected from among four
choices: –10, –15, –20, or –25 dB. Press-
ing the dim button will enable the function.
The dim button is always set to “latch” the
function on and off. The 4-digit display,
when selected for output level mode, will
indicate the revised monitor output level.
If the “dimmed” output level is equal to or
less than the minimum attenuated level,
the monitor output will go into a full mute
and the display will show four horizontal
dashes. When dim is active the monitor