Telephonic communications – Echo cancellation or suppression – Residual echo cancellation
Reexamination Certificate
2005-02-28
2010-06-08
Jamal, Alexander (Department: 2614)
Telephonic communications
Echo cancellation or suppression
Residual echo cancellation
Reexamination Certificate
active
07734035
ABSTRACT:
Methods and apparatus are provided for reducing echo from a received signal. A suppression gain is applied to an output of an echo canceler that has processed the received signal. The suppression gain includes a region of sloping attenuation about a decision point. The echo canceler optionally estimates an echo path and subtracts then estimate from the received signal. The suppression gain includes a non-zero lower bound, gmin, on a maximum attenuation applied by a suppressor, that is based on operating conditions of the echo canceler. The region of sloping attenuation applies a variable amount of attenuation that depends on the size of an output error ē(n) of the echo canceler relative to the received signal, x(n).
REFERENCES:
patent: 6442275 (2002-08-01), Diethorn
patent: 6834108 (2004-12-01), Schmidt
M. M. Sondhi and D. A. Berkley entitled “Silencing Echoes On The Telephone Network,” Proceedings of the IEEE, vol. 68, No. 8, pp. 948-963, Aug. 1980.
Diethorn Eric John
Szajdecki Richard
Avaya Inc.
Breyer Wayne S.
DeMont Jason Paul
Jamal Alexander
Ryan Joseph B.
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