Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms, Wikipedia.
VAD[vad or ‚vē‚ā′dē]
(Bolshoi Vad), a river in Penza Oblast, RSFSR, and the Mordvinian ASSR, a left tributary of the Moksha River (Oka basin). Length, 222 km; basin area, 6,500 sq km. It arises from a group of springs and flows between sloping banks which are predominantly marshy or forested. The average yearly flow on its upper reaches (at Avdalovo) is 7.5 cu m per sec. It is floatable during its periods of greatest flow.
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.