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For Vox, the makers of amplifers, guitars and organs, see Vox (musical equipment).

In telecommunication, a vox (short for 'voice operated switch') is an acoustoelectric transducer and a keying relay connected so that the keying relay is actuated when sound, or voice, energy above a certain threshold is sensed by the transducer.

Note: A vox is used to eliminate the need for push-to-talk operation of a transmitter by using voice energy to turn on the transmitter. Synonyms voice operated relay circuit , voice operated transmit.

Source: from Federal Standard 1037C and from MIL-STD-188

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