Acoustic echo canceller
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United States of America Patent
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-
Jul 18, 2000
Grant Date -
N/A
app pub date -
Jun 23, 1998
filing date -
Jun 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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