Adaptive thresholds in acoustic echo canceller for use...

Details Adaptive thresholds in acoustic echo canceller for use... Adaptive thresholds in acoustic echo canceller for use...

2005-11-22

2005-11-22

Mei, Xu (Department: 2644)

Electrical audio signal processing systems and devices

Dereverberators

C379S406140, C379S406120, C381S094300

Reexamination Certificate

active

06968064

ABSTRACT:
Disclosed is an apparatus for cancelling far endpoint echo signals in audio signals transmitted from a near endpoint to a far endpoint. In one embodiment, the apparatus includes a near endpoint analysis filter bank operable to divide a near endpoint signal into a plurality of near endpoint subband signals, a far endpoint analysis filter bank operable to divide a far endpoint signal into a plurality of far endpoint subband signals, and a background signal power estimator operable to determine background noise at the near end.

REFERENCES:
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patent: 5587998 (1996-12-01), Velardo et al.
patent: 6438225 (2002-08-01), Tahernezhaadi
patent: 6574336 (2003-06-01), Kirla
patent: 6628781 (2003-09-01), Grundstrom et al.
patent: 6757385 (2004-06-01), Ehrenstråle et al.

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