Apparatus and method for noise attenuation in a speech recognition system
US6768979B1 · kind B1 · utility
206Cited by
14References
39Claims
0Family size
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Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/0264
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.