Abbreviation for very low frequency. See electromagnetic spectrum.

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Abbreviation for via net loss.

Abbreviation for voice-coder. A device that usually consists of a speech analyzer, which converts analog speech waveforms into narrowband digital signals, and a speech synthesizer, which converts the digital signals into artificial speech sounds.
Note 1: For COMSEC purposes, a vocoder may be used in conjunction with a key generator and a modulator-demodulator to transmit digitally encrypted speech signals over… (Read More →)

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Acronym for voice-operated device anti-sing. A device used to prevent overall voice-frequency singing in a two-way telephone circuit by ensuring that transmission can occur in only one direction at any given instant.

Acronym for voice-operated gain-adjusting device. A device that has a substantially constant output amplitude over a wide range of input amplitudes.

Synonym voice frequency.

See vocoder.

A UIH (unnumbered information with header check) frame that contains a voice packet in its information field. [T1.312-1991]