Studio Technologies 74 - Manual (Page 34)

Model 74/75 User Guide Issue 2, January 2006
Studio Technologies, Inc. Page 35
for Surround
to stereo or stereo signals converted to
mono. How these functions affect the au-
dio signals will greatly depend on how the
Model 75 is confi gured. Being aware of the
selected confi guration will allow the func-
tions to serve a more useful role.
5.1 to Stereo
The 5.1 to stereo downmix function allows
surround signals to be mixed or “folded
down” into a stereo (left and right) signal.
Phase relationships and inter-channel level
issues can be quickly observed. Please
refer to the Technical Notes section of this
guide for a detailed description of how the
5.1 to stereo function mixes the surround
sources to stereo.
Using the 5.1 to stereo function simply
requires the button labeled Downmix
Stereo to be pressed. The button is always
set to “latch” the function on and off. The
associated LED lights when the function is
enabled. The stereo signal created by the
5.1 to stereo downmix function is routed to
the left and right channels of the selected
monitor output.
Depending on how the Model 75 Control
Console is confi gured, the 5.1 to stereo
downmix function may automatically en-
able whenever the stereo to mono down-
mix function is enabled. This is provided
to ensure an operator hears a valid mono
signal when a surround source is selected
as an input.
Stereo to Mono
The operating characteristics of the stereo
to mono downmix function depend on the
Model 75 Control Console’s confi guration.
Two stereo to mono downmix modes are
available, as are four attenuation levels.
In the mono-to-left-and-right mode the
function combines (sums) the signals on
the left and right channels and routes the
result to both the left and right channels of
the selected monitor output. This method
is the same as found on many stereo-
oriented audio consoles. Useful for music
mixing, it’s not true monaural but rather
binaural.
The mono-to-center mode of the stereo to
mono downmix function combines (sums)
the left and right channels and routes the
result to the center channel of the selected
monitor output. This function allows a more
accurate reproduction of a mono signal,
but may not be suitable for all operators.
To enable the stereo to mono downmix
function simply requires the button labeled
Downmix Mono to be pressed. The button
is always set to “latch” the function on and
off. The associated LED will light whenever
the function is enabled.
Bandpass Filter for Mono-to-Center
Mode
A special feature has been included to as-
sist an operator in determining compatibili-
ty with “real-world” playback environments.
A bandpass fi lter can be inserted into the
path of the stereo to mono downmix sig-
nal when it is being routed to the center
channel. This allows the simulation of the
response of a loudspeaker associated with
an inexpensive monaural television or por-
table radio. The fi lter passes signals in the
range of 100 Hz to 5 kHz, while rejecting
those above and below.
To highlight for clarity, the bandpass fi lter
is only available for use when the stereo to
mono downmix function has been confi g-
ured for the mono-to-center mode. For a
detailed technical description of the band-
pass fi lter please refer to the Technical
Notes section of this guide.