Echo canceller

Details Echo canceller Echo canceller

2005-05-10

2005-05-10

Isen, Forester W. (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S406080, C704S224000, C381S066000

Reexamination Certificate

active

06891948

ABSTRACT:
The present invention provides an echo canceller having a holding portion which holds at least a communication frame length's worth of reception signals; a power calculation portion which calculates power for each communication frame based on the reception signals held in this holding portion; a divider which divides, by the power calculated for each communication frame, the echo elimination residue signal for each sample of the communication frame output from a subtractor; and an update portion which updates the tap coefficients of an adaptive filter according to the output signals from the divider.

REFERENCES:
patent: 880260 (1998-11-01), None
patent: 884886 (1998-12-01), None
“Introduction to Adaptive Filters”, S. Haykia, Macmillan Publishing Co., New York.

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