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Definition: VAD


(1) (Value Added Dealer) See VAR.

(2) (Voice Activated Dialing) Dialing a phone by speaking the names or numbers. VAD is a common capability on smartphones.

(3) (Voice Activity Detection) An algorithm that determines when an audio signal is a human's voice. VAD is used in voice over IP (VoIP) and speech recognition systems in order to not waste computer processing cycles if the sound is not human speech.