System and method of using two coefficient banks in an...

Details System and method of using two coefficient banks in an... System and method of using two coefficient banks in an...

2006-06-13

2006-06-13

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406110

Reexamination Certificate

active

07062038

ABSTRACT:
A device has a first echo canceller having a first bank of coefficients to be applied to a reference signal to produce a first echo prediction signal, and a first arithmetic unit to combine the first echo prediction signal with the echo-bearing signal to produce a first echo-cancelled signal. A second echo canceller receives the reference signal and the first echo-canceled signal, and has a second bank of coefficients to be applied to the reference signal to produce a second echo prediction signal. The second bank of coefficients is adapted to improve echo cancellation in the second echo canceller. A second arithmetic unit combines the first echo-cancelled signal with the second echo-prediction signal to produce a second echo-cancelled signal. A third echo canceller receives the second echo prediction signal and has an adaptive gain to be applied to the second echo prediction signal to produce a third echo prediction signal, and a third arithmetic unit to combine the third echo prediction signal with the first echo-cancelled signal to produce a third echo-cancelled signal. The device also has a selector to select one of echo-cancelled signals.

REFERENCES:
patent: 5610909 (1997-03-01), Shaw
patent: 5631899 (1997-05-01), Duttweiler
patent: 5777913 (1998-07-01), Rasmusson
patent: 6009083 (1999-12-01), Flanagan et al.
patent: 6263078 (2001-07-01), McLaughlin et al.

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