Noise reduction and comfort noise gain control using bark band weiner filter and linear attenuation
US7454010B1 · kind B1 · utility
35Cited by
2References
8Claims
0Family size
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Key dates
| Filing date | Nov 3, 2004 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Dec 31, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/012
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A combination of noise suppression using a Bark band modified Weiner filter and linear noise reduction improves elimination of noise in a telephone. A detector for detecting long, non-speech intervals is coupled to the output of the noise suppresser and controls selection of noise suppression or noise reduction. A gain smoothing filter has a long time constant when noise reduction is used and provides a gradual transition from one level of gain to another. Comfort noise is smoothly inserted by updating the data for generating comfort noise only during detected long, non-speech intervals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.