Acoustic echo canceller

Details Acoustic echo canceller Acoustic echo canceller

1998-06-23

2000-07-18

Isen, Forester W.

Telephonic communications

Echo cancellation or suppression

379410, 379411, 381 711, H04M 908, H04B 320

Patent

active

060918136

ABSTRACT:
A method and apparatus for cancelling acoustic echoes that enhances the hands free operation of audio/video conferencing equipment, wireless and cellular telephones, internet and intranet telephones, etc. is disclosed. The method and apparatus use a constrained and orthogonalized, frequency domain, block, least mean square adaptive filter to generate an estimate of an acoustic echo signal. The estimate of the acoustic echo signal is subtracted from a near end microphone signal to provide an echo reduced communication signal. The echo reduced communication signal is then either transmitted or processed further. The further processing can include non-linear processing using an adaptive speech filter. The method and apparatus include a novel method for updating the coefficients of an adaptive filter.

REFERENCES:
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patent: 5305307 (1994-04-01), Chu
patent: 5315585 (1994-05-01), Iizuka et al.
patent: 5526426 (1996-06-01), McLaughlin
patent: 5561668 (1996-10-01), Genter
patent: 5577116 (1996-11-01), Townsend et al.
patent: 5768473 (1998-06-01), Eatwell et al.
patent: 5848151 (1998-12-01), Boudy et al.

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