Method and system for noise suppression using external voice activity detection
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United States of America Patent
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-
Sep 9, 2003
Grant Date -
Oct 17, 2002
app pub date -
Apr 19, 1999
filing date -
Apr 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A communications transmitter which operates as a mobile telephone incorporates a noise suppressor (100, FIG. 1) which reduces the background noise in the transmitted voice signal. An external voice activity detector (150), which operates in conjunction with a noise suppressor (100) estimates the signal power of the incoming voice signal and compares this to an estimated noise floor. As a result of this comparison, a voice activity factor is applied to an updated noise floor estimate to create a voice activity threshold estimate. The voice activity threshold estimate is then used to decide whether or not to the force noise suppressor (100) to perform an update of a noise content estimate of the incoming voice signal.
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