Echo canceller and waveform-distortion compensation device

Details Echo canceller and waveform-distortion compensation device Echo canceller and waveform-distortion compensation device

1995-07-18

1997-08-19

Zele, Krista M.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370286, 370290, 379 3, H04B 323

Patent

active

056596090

ABSTRACT:
An echo canceller is disclosed which generates an echo replica based on a transmit signal to cancel an echo. The echo canceller includes a linear echo canceller circuit for generating an echo replica of the transmit signal in the absence of distortion. The echo canceller further includes a waveform-distortion compensation circuit, coupled with the linear echo canceller circuit, for generating an echo replica for compensating waveform distortion occurred in an echo response when the transmit signal is distorted. In the echo canceller, the echo is canceled by use of the echo replica generated in the linear echo canceller circuit in the absence of distortion in the transmit signal, and is canceled by use of the echo replica generated in the waveform-distortion compensation circuit when the transmit signal is distorted.

REFERENCES:
patent: 4605826 (1986-08-01), Kanemasa
patent: 4695998 (1987-09-01), Schollmeir
patent: 4792940 (1988-12-01), Hiraguchi
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patent: 5353279 (1994-10-01), Koyama
patent: 5375147 (1994-12-01), Awata et al.
Messerschmitt, David G., "Asynchronous and Timing Jitter Insensitive Data Echo Cancellation", IEEE Transactions on Communications, vol. COM-34, No. 12, Dec. 1986, pp. 1209-1217.

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