a device in certain types of telecommunications equipment, as telephone answering machines, that converts an incoming voice or sound signal into an electrical signal that turns on a transmitter or recorder that continues to operate as long as the incoming signal is maintained.
Origin: acronym from voice-operated keying, altered to conform to Latinvōxvoice
1550, from L., lit. "voice" (see voice). Especially in vox populi (1550) "the voice of the people" (the full maxim is Vox populi vox Dei "the voice of the people is the voice of God").