Noise reduction and comfort noise gain control using bark...

Details Noise reduction and comfort noise gain control using bark... Noise reduction and comfort noise gain control using bark...

2004-11-03

2008-11-18

Singh, Ramnandan (Department: 2614)

Telephonic communications

Substation or terminal circuitry

Noise suppression

Reexamination Certificate

active

07454010

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.

REFERENCES:
patent: 6377637 (2002-04-01), Berdugo
patent: 6625284 (2003-09-01), Ariyama
patent: 2006/0229869 (2006-10-01), Nemer

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