Data Sheet

be muted as required. In the solo mode, one channel can be monitored while the others are automatically muted. Depending on
the configuration, multiple channels can be simultaneously selected for “soloing.” The flexibility 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 down
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mix function is used to create a stereo signal from a 5.1 (surround) source. The stereo to mono downmix 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 operating 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 filter feature is associated with the stereo to mono downmix function. It is included to assist an operator in determin-
ing compatibility with “real world” playback environments. A bandpass filter 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 function. 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 headphones. 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.
Typically the talkback button contained in the Model 75 will be used to initiate the talkback function. However, some applica
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tions may benefit from having remote activation of talkback. The system provides several ways of accomplishing this.
In many cases the talkback button contained in the Model 75 will be used to initiate the talkback function. However, some
applications may benefit 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 transmitter to enable talkback. The microphone con-
tained within the Model 75 Control Console provides crisp, clear talkback audio. But some installations may benefit from using
an alternate source of talkback audio. This capability is provided by the Model 74’s line-level talkback audio input.
For flexibility, the system is designed to easily integrate with recording consoles, specialized playback systems, and audio-for-
picture machine-control electronics. Four hard-wired remote-control input functions are provided: mute all, dim, talkback,
and input select. By providing access to the StudioComm’s mute all and dim functions, talkback or slate activity from an audio
console or other communications system can control the monitor output level. The remote talkback input allows an externally
provided contact closure or logic signal to control the talkback function. This allows easy integration with additional wired or
wireless talkback devices. The remote input select function is provided expressly for audio post applications, allowing automatic
switching of the StudioComm’s input source whenever the mode of a recording system changes between playback and record.
This function, referred historically as PEC/direct switching, allows accurate monitoring during dialog replacement, Foley, or
other overdub sessions.
Model 35 Talent Amplifier
In most cases Model 35 Talent Amplifier modules will serve as the user’s headphone
control center. Each Model 35 contains amplifier circuitry, stereo level control,
mono switch, and two output jacks. For convenience, a microphone mounting stand
adapter is included with each Model 35. In addition to the talent amplifier output,
the Model 74 also provides a stereo line-level cue output. This allows interfacing
with other headphone cue systems or could connect to a transmission system associated with a remotely located studio or control
room. The line-level cue output can also serve as a source of “slate” audio for workstations.
Studio Technologies, Inc. StudioComm 74/75, Issue 1, Page 3