Method and apparatus for compensating for an echo signal...

Details Method and apparatus for compensating for an echo signal... Method and apparatus for compensating for an echo signal...

2005-10-18

2005-10-18

Mei, Xu (Department: 2644)

Telephonic communications

Echo cancellation or suppression

C379S402000

Reexamination Certificate

active

06956944

ABSTRACT:
A balanced hybrid circuit for compensating for transmission echo signal in a modem. The hybrid circuit includes transmission echo compensation circuits that approximate the echo signal effects of the line and line transformer, respectively, and produce a transmission echo signal replica. A sample of the transmission signal and the replica of the transmission echo are then subtracted from the signal received on the line to produce a received signal isolated from the transmission signal and the transmission echo signal.

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