Adaptive echo canceller

Details Adaptive echo canceller Adaptive echo canceller

1990-07-12

1992-09-29

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 370 321, H04M 100

Patent

active

051519372

ABSTRACT:
An adaptive echo canceller for suppressing an echo in an input signal by a pseudo echo, includes a pseudo echo generation filter having a predicted impulse response sequence of an echo path as filter coefficients thereof for generating a pseudo echo, a coefficient renewal part for adaptively renewing the filter coefficients of the pseudo echo generation filter, and a part for suppressing an echo by the pseudo echo which is generated by the pseudo echo generation filter. The coefficient renewal part includes a part for dividing renewed filter coefficients into a plurality of groups each having a certain number of renewed filter coefficents, and a part for successively selecting one group with a predetermined period and carrying out a correction process with respect to the renewed filter coefficients within the selected group, where the correction process corrects an accumulation of errors of renewal processes.

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