Echo canceller with interference-level controlled step size

Details Echo canceller with interference-level controlled step size Echo canceller with interference-level controlled step size

2005-01-20

2010-10-12

Tsang, Fan (Department: 2614)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406110, C381S071110, C381S318000

Reexamination Certificate

active

07813497

ABSTRACT:
Echo canceling method comprising the steps: a) receiving a first signal and a second signal, said second signal comprising an echo of the first signal, b) generating an echo replica signal by filtering the first signal with a finite impulse response filter, said finite impulse filter using a filter coefficient vector for generating the echo replica signal, generating an echo cancelled signal by subtracting the echo replica signal from the second signal, d) determining a measure of interference within the second signal, e) determining a step vector depending on said measure of interference, wherein increasing the measure of interference continuously reduces a size of the step vector, and f) updating the filter coefficient vector by the step vector.

REFERENCES:
patent: 5606550 (1997-02-01), Jangi
patent: 5734715 (1998-03-01), Scalart et al.
patent: 5960077 (1999-09-01), Ishii et al.
patent: 2004/0001450 (2004-01-01), He et al.
patent: 1 714 398 (2009-03-01), None
patent: 2 738 695 (1997-03-01), None
patent: 2 748 184 (1997-10-01), None
patent: 2 075 313 (1981-11-01), None

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