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

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

H - Electricity

04

M

379/64

H04M 3/18 (2006.01) G10K 11/178 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1198236

Abstract of the Disclosure: In a self-adaptive 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.hj') 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 Image 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. [Fig. 1]

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