Method for adaptive control of multichannel acoustic echo...

Details Method for adaptive control of multichannel acoustic echo... Method for adaptive control of multichannel acoustic echo...

2006-05-09

2006-05-09

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Disable or inhibit function

C379S406080, C379S390020

Reexamination Certificate

active

07043013

ABSTRACT:
A method for adaptive control of a multi-channel echo cancellation system including N loudspeakers, where N is an integer greater than or equal to 2, and M microphones, where M is an integer greater than or equal to 1. The system includes N×M identification filters with variable coefficients, the identification filters being used to estimate acoustic coupling between the loudspeakers and the microphones as a function of a variable coefficients adaptive step. The variable coefficients adaptive step depends on whether or not there is a signal present on the loudspeakers. The method is applicable to hands-off operation of communication tools.

REFERENCES:
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patent: 5664019 (1997-09-01), Wang et al.
patent: 5828756 (1998-10-01), Benesty et al.
patent: 0 766 446 (1997-04-01), None
patent: 0 944 228 (1999-09-01), None
F. Amand et al.: “Multi-channel acoustic echo cancellation” International Workshop on Acoustic Echo and Noise Control, pp. 57-60 1995.

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