Voice activity detector for speech signals in variable backgroun

Details Voice activity detector for speech signals in variable backgroun Voice activity detector for speech signals in variable backgroun

1993-03-26

1995-10-17

MacDonald, Allen R.

395 223, 395 224, 395 235, G10L 900

Patent

active

054598141

ABSTRACT:
A voice activity detector (VAD) which determines whether an input signal contains speech by deriving parameters measuring short term time domain characteristics of the input signal, including the average signal level and the absolute value of any change in average signal level, and comparing the derived parameter values with corresponding predetermined threshold values. In order to further minimize clipping and false alarms, the VAD periodically monitors and updates the threshold values to reflect changes in the level of background noise.

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