Telephonic communications – Echo cancellation or suppression – Using digital signal processing
Reexamination Certificate
2005-03-31
2010-10-12
Tsang, Fan (Department: 2614)
Telephonic communications
Echo cancellation or suppression
Using digital signal processing
C379S406050, C379S406130, C381S066000, C381S093000, C381S094200
Reexamination Certificate
active
07813499
ABSTRACT:
A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not suppressed by an acoustic echo canceller (AEC). In general, a prescribed regression technique is used between a prescribed spectral attribute of multiple past and present, fixed-length, periods (e.g., frames) of the speaker signal and the same spectral attribute of a current period (e.g., frame) of the echo residual in the output of the AEC. This automatically takes into consideration the correlation between the time periods of the speaker signal. The parameters of the regression can be easily tracked using adaptive methods. Multiple applications of RES can be used to produce better results and this system and process can be applied to stereo-RES as well.
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Chhetri Amit
Platt John
Stokes Jack
Surendran Arungunram
Lyon Richard T.
Lyon & Harr LLP
Microsoft Corporation
Sharifzada Ibraham
Tsang Fan
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