Fast converging adaptive filter

Details Fast converging adaptive filter Fast converging adaptive filter

1993-09-03

1995-06-27

Envall, Jr., Roy N.

Boots, shoes, and leggings

370 321, 379406, G06F 1531, H04J 100, H04J 300

Patent

active

054285623

ABSTRACT:
A fast affine projection adaptive filter capable of frequent parameter updating and fast convergence with low complexity. The invention mitigates affine projection adaptive filter complexity due to matrix inversion and the fact that a given excitation vector is weighted and summed into the adaptive coefficient vector many times. Embodiments of the invention achieve fast convergence through sample by sample updating and the exploitation of the shift invariant property of the excitation signal. Complexity is further reduced by a vector update procedure in which a given excitation vector is weighted and added into the coefficient estimate only once. Three illustrative embodiments are presented. The first of these is a relaxed adaptive filter, the second is an adaptive filter without relaxation and a third is an adaptive filter with suspended adaptation. The embodiments are presented in the context of electrical and acoustic echo cancellation.

REFERENCES:
patent: 5001701 (1991-03-01), Gay
patent: 5177734 (1993-01-01), Cummiskey et al.
S. Makino and Y. Kaneda, "Exponentially Weighted Step-Size Projection Algorithm for Acoustic Echo Cancellers," IEICE Trans. Fundamentals, vol. E75-A, No. 11, 1500-1508 (Nov. 1992.).
M. Tanaka et al., "Reduction of Computation for High-Order Projection Algorithm," 1993 Electronics Information Communication Society (and associated viewgraphs) (1993).
J. M. Cioffi et al., "Windowed Fast Transversal Filters Adaptive Algorithms with Normalization," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-33, No. 3, 607-625 (Jun. 1985).
G. V. Moustakides et al., "Fast Newton Transversal Filters-A New Class of Adaptive Estimation Algorithms," IEEE Transactions on Signal Processing, vol. 39, No. 10, 2184-2192 (Oct. 1991).

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