Apparatus and method for noise attenuation in a speech recognition system
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United States of America Patent
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Jul 27, 2004
Issued Date -
N/A
app pub date -
Mar 31, 1999
filing date -
Oct 22, 1998
priority date (Note) -
Expired
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Abstract
The noise suppressor utilizes statistical characteristics of the noise signal to attenuate amplitude values of the noisy speech signal that have a probability of containing noise. In one embodiment, the noise suppressor utilizes an attenuation function having a shape determined in part by a noise average and a noise standard deviation. In a further embodiment, the noise suppressor also utilizes an adaptive attenuation coefficient that depends on signal-to-noise conditions in the speech recognition system.
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