John S Platt

US Patent:

7813499, Oct 12, 2010

Filed:

Mar 31, 2005

Appl. No.:

11/097548

Inventors:

Amit Chhetri - Tempe AZ, US
Arungunram Surendran - Sammamish WA, US
Jack Stokes - North Bend WA, US
John Platt - Redmond WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

H04M 9/08

US Classification:

37940614, 37940605, 37940613, 381 66, 381 93, 381 942

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.

US Patent:

8416946, Apr 9, 2013

Filed:

Sep 24, 2010

Appl. No.:

12/890075

Inventors:

Amit Chhetri - Tempe AZ, US
Arungunram Surendran - Sammamish WA, US
Jack Stokes - North Bend WA, US
John Platt - Redmond WA, US

Assignee:

Microsoft Corporation - Redmond WA

International Classification:

H04M 9/08

US Classification:

37940603, 37940605

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.