Method and apparatus for adaptive filtering

Details Method and apparatus for adaptive filtering Method and apparatus for adaptive filtering

1995-03-30

1996-12-31

Olms, Douglas W.

Multiplex communications

Duplex

Transmit/receive interaction control

375232, 36472419, G06F 1710

Patent

active

055901212

ABSTRACT:
A finite impulse response (FIR) filter characterization is performed using a modified least means squares approach that updates values of FIR filter taps as groups of taps, periodically. For the taps updated for a current input signal sample, future convolution values for future input signal samples are computed and also a partial estimate of the signal response is computed. The expected response is then computed by summing the partial estimate signal response and other partial estimates of the signal response which are computed from future convolution, missed tap update convolution and normalizes error signal values which have been previously computed at past input signal samples and stored in memory.

REFERENCES:
patent: 4771396 (1988-09-01), South et al.
patent: 5216629 (1993-06-01), Gurcan et al.
patent: 5455819 (1995-10-01), Sugiyama
Messerschmitt, D. G., "Echo Cancellation in Speech and Data Transmission," IEEE Journal on Selected Areas in Communications, vol. SAC-2, No. 2, Mar. 1984, pp. 283-296.
Treichler, J. R., et al., Theory and Design of Adaptive Filters, "Digital Voice Echo Canceller with a TMS32020," by Texas Instruments and Teknekron Communications System, John Wiley & Sons, New York, pp. 302-323.
M. A. Soderstrand et al., "Experimental Performance Data for Slowed-Down Adaptive Algorithms", Int. J. Electronics, vol. 53, No. 1, pp. 95-99 1982.

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