Self-adaptive echo canceller capable of keeping a degree of canc

Details Self-adaptive echo canceller capable of keeping a degree of canc Self-adaptive echo canceller capable of keeping a degree of canc

1983-09-27

1987-03-03

Rubinson, Gene Z.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, H04B 320

Patent

active

046481117

ABSTRACT:
In a self-adpative echo canceller responsive to a receive-in signal and an echo signal resulting from the receive-in signal, a learning identification technique is implemented so as to exempt a send-out signal from the echo signal by successively varying an amount of modification (.DELTA.h.sub.j ') represented by .beta.eX, where .beta. represents a coefficient; e, a level of the send-out signal; and X, a level of the receive-in signal. A coefficient calculating circuit (28, 30, 35) calculates the coefficient .beta. from the factor and an incoming level (X) of the receive-in signal to determine the amount of modification. The coefficient is accompanied by a modifier given by 2X.sup.2 /(K+X.sup.2), where K represents a constant. The coefficient calculating circuit includes a unit (35) for calculating the modifier. The modifier may be multiplied by various factors of the amount of modification.

REFERENCES:
patent: 3922505 (1975-11-01), Hoge
patent: 4064379 (1977-12-01), Horna
patent: 4479036 (1984-10-01), Yamamoto et al.

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