Acoustic echo cancellation based on noise environment

Details Acoustic echo cancellation based on noise environment Acoustic echo cancellation based on noise environment

2007-08-31

2010-10-05

Gauthier, Gerald (Department: 2614)

Telephonic communications

Echo cancellation or suppression

C370S201000, C370S286000, C379S406070, C379S406080, C379S406090, C381S066000, C455S063100, C455S079000, C455S570000

Reexamination Certificate

active

07809129

ABSTRACT:
A method (200) of cancelling echo in a duplex communication device (100). The method can include detecting a level of noise present on an uplink signal path (104), generating a noise classifier (194) based on the detected level of noise, detecting whether uplink audio is present on the uplink signal path (104) and detecting whether downlink audio is present on a downlink signal path (102). The method further can include generating a double talk flag (136) based at least on the noise classifier, whether uplink audio is present on the uplink signal path, and whether downlink audio is present on the downlink signal path. In addition, the double talk flag, the noise classifier and an uplink signal can be processed to generate an output signal (120) having reduced echo.

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