Acoustic echo canceler

Details Acoustic echo canceler Acoustic echo canceler

1997-07-18

1999-01-12

Harvey, Minsun Oh

Electrical audio signal processing systems and devices

Dereverberators

379410, 381 711, H04B 320

Patent

active

058599142

ABSTRACT:
The invention provides an acoustic echo canceler which realizes sufficient echo suppression processing on an auditory sense which matches with an amount of calculation and realizes a good speech quality. The acoustic echo canceler includes a first analysis filter bank for dividing a reception signal into a plurality of sub-bands, a plurality of adaptive filters for individually producing false echo signals from the reception signal after divided into the sub-bands, a second analysis filter bank for dividing an input signal into a plurality of sub-bands, a plurality of subtractors for subtracting the false echo signals corresponding to the sub-bands from the input signal after divided into the sub-bands, and a synthesis filter bank for composing outputs of the subtractors. The acoustic echo canceler further includes a band information calculation section for estimating influences of the echoes for the individual sub-bands and determining a priority order based on the estimation. Each of the adaptive filters determines processing to be executed thereby based on the priority order.

REFERENCES:
patent: 4956838 (1990-09-01), Gilloire
patent: 5272695 (1993-12-01), Makino
patent: 5561668 (1996-10-01), Genter
patent: 5566167 (1996-10-01), Duttweiler
A. Sugiyama, "An Adaptive Intersubband Tap Assignment Algorithm For Subband Adaptive Filtering With A Colored Input", 1994 Spring General Meeting of the Electronic Information and Communication Society of Japan, A-172.

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