Listener echo cancellation

Details Listener echo cancellation Listener echo cancellation

1991-02-19

1993-02-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379410, 379411, H04J 310

Patent

active

051896648

ABSTRACT:
A bulk delay and a finite impulse response (FIR) filter with adjustable coefficients to approximate the listener echo in a transmission line. The present invention subtracts the approximated echo from the line signal. By implementing a phase lock loop, the circuit compensates for phase changes in the listener echo brought on during additional round trips through the telephone line. Cancelling the echo permits the slicer to make a better decision about which constellation point is actually being represented.

REFERENCES:
patent: 4805215 (1989-02-01), Miller
patent: 4813073 (1989-03-01), Ling
patent: 4868874 (1989-09-01), Takatori et al.
patent: 4887257 (1989-12-01), Belloc et al.
patent: 4887258 (1989-12-01), Belloc et al.
patent: 4896318 (1990-01-01), Kokubo et al.
patent: 4982428 (1991-01-01), Agazzi et al.
patent: 4987569 (1991-01-01), Ling et al.

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