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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

INX

BALANCED INPUT

BALANCED OUTPUT EXAMPLE

OPTIONAL 600 OHM

TERMINATOR

OUT

INX

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 • 1

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