Crestron
ST-VC
Volume Control Module
Volume Control Module: ST-VC
Description
Functional Description
The Volume Control Module is a digitally controlled 3-channel audio attenuator.
Each channel has independent settings for volume, treble, bass, and mute.
Transitions between any attenuation settings are “pop” free. The module is ideally
suited to provide full audio control for systems without an IR-controlled integrated
receiver. Choose a mixer, preamp, and amplifier. Then add a Volume Control
Module to complete the system. In some applications the module's separate control
of treble and bass may even eliminate the need for a graphic equalizer.
Volume, bass, and treble ramp times, scaling, preset levels, and volume muting may
be specified on a per-channel basis (within the specified hardware range). Volume,
bass, and treble are fully independent of each other on each channel. All of these
various aspects are specified in software. Volume, bass, and treble control may be
sent to more than one channel via software so as to support stereo applications.
Input impedance and balance are determined by external connections. Refer to the
diagram below. Input and output are completely independent of each other.
Therefore, it is possible to have a balanced input paired with an unbalanced output
and vice-versa.
Examples of Balanced and Unbalanced External Connections
-
OUT
+
-
G
IN
X
+
BALANCED INPUT
BALANCED OUTPUT EXAMPLE
OPTIONAL 600 OHM
TERMINATOR
-
OUT
+
-
G
IN
X
+
UNBALANCED 10K INPUT
UNBALANCED OUTPUT EXAMPLE
The treble and bass controls are independent from volume and are individually
controlled for each channel. Each channel includes a muting relay with 104 dB
attenuation. When the signal driving MUTEA goes high, the muting circuit is
activated providing 104 dB drop from any preset volume level. Likewise channels
Operations Guide - DOC. 5676A
Volume Control Module: ST-VC
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