Gain control method for acoustic echo cancellation and...

Details Gain control method for acoustic echo cancellation and... Gain control method for acoustic echo cancellation and...

H - Electricity

04

M

H04M 9/08 (2006.01) G10K 11/178 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2414972

A gain control method for reducing or eliminating the undesirable effects of acoustic echo coupling between a speaker and a microphone while providing a full- duplex connection. Weighted normalized far-end and near-end powers are used to first calculate a suppression value which is used to determine the attenuation factor between an upper and a lower limit, thus improving reliability in noisy environments. To further improve the quality of the full-duplex connection, a smoothing factor is applied to the attenuation calculation to provide a low power and constant sounding echo without annoying transient-like sounds.

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