Variable Control Voice Actuator
Encyclopedia
The term Variable Control Voice Actuator (VCVA) refers to a digital recording
Digital recording
In digital recording, digital audio and digital video is directly recorded to a storage device as a stream of discrete numbers, representing the changes in air pressure for audio and chroma and luminance values for video through time, thus making an abstract template for the original sound or...

 technology developed by Olympus, which is implemented in many of their digital voice recorders. It prevents the recording of silence, so pauses in a speaker's dictation do not waste time, power or recording space.

Function

When the microphone
Microphone
A microphone is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. In 1877, Emile Berliner invented the first microphone used as a telephone voice transmitter...

picks up an arbitrary level of sound, the VCVA initiates recording, and when volume detected by that microphone dips down below said threshold the VCVA stops recording.
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