Method and apparatus for canceling echo in a telephone...

Details Method and apparatus for canceling echo in a telephone... Method and apparatus for canceling echo in a telephone...

2006-07-04

2006-07-04

Harold, Jefferey F. (Department: 2646)

Telephonic communications

Echo cancellation or suppression

Using digital signal processing

C379S406010, C379S406060

Reexamination Certificate

active

07072466

ABSTRACT:
Method and apparatus for signal reflection removal, such as echo cancellation, is described. Signal samples are delayed. The delays allow burst processing of consecutive samples of transmitting and receiving signals in a communication network, such as in a telephone communication system. As a result, there is tremendous reduction of memory bandwidth when compared to conventional sample-by-sample processing of signals. Echo cancellers described herein can be implemented in an FPGA. Echo in over a thousand channels can be cancelled using an FPGA and an external memory device. In embodiments for reflected signal cancellation, multiple stages of echo estimation are used.

REFERENCES:
patent: 5414766 (1995-05-01), Cannalire et al.
patent: 6654463 (2003-11-01), Leonidov et al.
patent: 44 18 792 (1995-11-01), None
patent: 0 272 714 (1988-06-01), None
U.S. Appl. No. 10/173,200, filed Jun. 14, 2002, Lilliott et al.

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