Echo canceller capable of cancelling an echo signal at a high sp

Details Echo canceller capable of cancelling an echo signal at a high sp Echo canceller capable of cancelling an echo signal at a high sp

1995-08-30

1998-08-18

Olms, Douglas W.

Multiplex communications

Duplex

Transmit/receive interaction control

379411, H04B 323

Patent

active

057967253

ABSTRACT:
An echo canceller (30) cancels an echo signal produced on a transmission path (14) on the basis of a received signal received through a reception path (15). The echo canceller comprises an adaptive filter (31) for producing a pseudo-echo signal from the received signal in accordance with tap gains. A producing section (19, 20) produces an error signal representative of an error level between the echo signal and the pseudo-echo signal. A supplying section (21, 32) supplies the adaptive filter with selected tap gains stored in a memory section (18) when the error level is less than a predetermined threshold level. The adaptive filter renews the selected tap gains into renewal tap gains in accordance with the received signal and the error signal to store the renewal tap gains of the selected tap gains in the memory section.

REFERENCES:
patent: 3894200 (1975-07-01), Campanella et al.
patent: 4823382 (1989-04-01), Martinez
patent: 4894820 (1990-01-01), Miyamoto et al.
patent: 5343521 (1994-08-01), Jullien et al.
patent: 5343522 (1994-08-01), Yatrou et al.
patent: 5351291 (1994-09-01), Menez et al.
patent: 5396517 (1995-03-01), Yedid et al.
patent: 5477534 (1995-12-01), Kusano

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