Studio Technologies 74 - Manual (Page 7)

Issue 2, January 2006 Model 74/75 User Guide
Page 8 Studio Technologies, Inc.
for Surround
position. This is useful in applications such
as on-air broadcast. By using the refer-
ence level function, the monitor output
level can be set to a pre-confi gured value.
This is provided for audio-with-picture ap-
plications that require a specifi c monitor
level. The reference level is easily confi g-
ured by taking an electronic “snapshot” of
the position of the rotary level control.
One button controls which monitor out-
put, A or B, is active. For operator conve-
nience, the dim function allows the monitor
output level to be reduced by a fi xed dB
amount. The dim level is confi gured from
four available levels. A mute all function
allows all of the monitor output channels
to be simultaneously muted. The mute/solo
section provides individual output channel
control. One pushbutton switch sets the
operating mode for either mute or solo. In
the mute mode, individual channels can
be muted as required. In the solo mode,
one channel can be monitored while the
others are automatically muted. Depend-
ing on the confi guration, multiple channels
can be simultaneously selected for “solo-
ing.” The fl exibility of having both mute and
solo available allows an operator to quickly
select the most comfortable and productive
operating mode.
Two functions allow the format of the
monitored sources to be checked for
level or phase inconsistencies. The 5.1
to stereo downmix function is used to
create a stereo signal from a 5.1 (sur-
round) source. The stereo to mono down-
mix function allows a stereo signal to be
added (summed) and monitored. The two
downmix functions can be simultaneously
enabled, allowing a surround signal to be
checked for mono compatibility. The oper-
ating mode of the stereo to mono downmix
function can be selected from two choices:
mono-to-left-and-right or mono-to-center.
This allows support for both music and
audio-with-picture applications. A bandpass
fi lter feature is associated with the stereo
to mono downmix function. It is included to
assist an operator in determining compat-
ibility with “real world” playback environ-
ments. A bandpass fi lter can be inserted
into the path of the mono signal, allowing
the response of a monaural loudspeaker
associated with an inexpensive television
or portable radio to be simulated.
To support the headphone cue system
functions the Model 75 Control Console
includes three pushbutton switches and
an integral microphone. As expected, one
button is used to enable the talkback func-
tion. The other two buttons are used to set
the talkback level over an 8-step range.
These buttons are also used to select
which audio source is routed to the head-
phones. Two choices are provided: the left
and right channels of the source selected
for the monitor output, or the left and right
channels associated with Stereo B.
In many cases the talkback button con-
tained in the Model 75 will be used to initi-
ate the talkback function. However, some
applications may benefi t from being able
to remotely activate talkback. A hard-wired
signal can be connected to the remote
talkback input. In this way various types
of external wired and wireless equipment
can be interfaced. An infrared (IR) receiver
module can also be directly connected.
This allows the use of a wireless transmit-
ter to enable talkback. The microphone
contained within the Model 75 Control
Console provides crisp, clear talkback
audio. But some installations may benefi t
from using an alternate source of talkback
audio. This capability is provided by the
Model 74’s line-level talkback audio input.