Voice Activity Detector
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Voice activity detection is an essential function in efficient speech processing systems for effective use of channel band width. In a large group of modern-day speech coders, the frequency domain is employed and information concerning the speech signal spectrum is generated during the operation of such devices. Another current device is the time domain voice detector which employs a simple comparison between the level of incoming speech and a fixed reference level in order to determine whether speech is present or absent. More advanced detectors adapt the reference level to match the characteristics of incoming speech, but the time waveform is still the source of the information on which the speech or no speech/noise decision is made.