Adaptive filter with coefficient averaging and method

Details Adaptive filter with coefficient averaging and method Adaptive filter with coefficient averaging and method

1989-05-03

1990-05-01

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

36472416, 370 321, H04B 323

Patent

active

049225308

ABSTRACT:
An adaptive transversal filter is characterized by a first adaptive filter for generating a plurality of estimated impulse response coefficients representing an impulse response of a transmission path. An averaging circuit is coupled with the first adaptive filter, and generates a plurality of average estimated impulse response coefficients having values in accordance with the average values over a most recent time interval of associated ones of the estimated impulse response coefficients, and a second adaptive filter receives the average estimated coefficients. The average estimated impulse response coefficients more closely represent and have less variance with respect to the actual impulse response of the transmission path than do the estimated coefficients, and the second filter generates an estimate of an echo signal through a process including convolution of the average estimated coefficients and an input signal. The adaptive transversal filter is particularly suited for use in an adaptive hybrid circuit.

REFERENCES:
patent: 4757527 (1988-07-01), Beniston et al.
"A Single-Chip VLSI Echo Canceler," D. L. Duttweiler et al., The Bell System Technical Journal, Feb. 1980, vol. 59, No. 2, pp. 149-160.

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