Adaptive sparse echo canceller using a sub-rate filter for activ

Details Adaptive sparse echo canceller using a sub-rate filter for activ Adaptive sparse echo canceller using a sub-rate filter for activ

1992-06-04

1994-08-30

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 370 321, H04B 323

Patent

active

053435222

ABSTRACT:
With the presently described echo canceller, a sparse adaptive transversal filter is used to model and cancel only the active regions of the echo impulse response. Since the tap coefficients, in the dormant regions, are set to zero and have no random fluctuation this approach reduces computation time and excess meansquare error in the tap coefficients. Also, the present design provides for increased speed of convergence of the sparse canceller as compared to the full-tap canceller, since convergence is proportional to the number of active taps in the LMS algorithm.

REFERENCES:
patent: 4644108 (1987-02-01), Crouse et al.
patent: 4805215 (1989-02-01), Miller
patent: 4823382 (1989-04-01), Martinez
patent: 4903247 (1990-02-01), Van Gerwen et al.
patent: 4951269 (1990-08-01), Amano et al.
patent: 5029167 (1991-07-01), Arnon et al.
patent: 5146494 (1992-09-01), Harman
"A DSP-Based Echo-Canceller with Two Adaptive Filters", IEEE ICASSP '86, pp. 46.8.1-46.8.5 by H. Chang et al.
"Subsampling to Estimate Delay with application to Echo Cancelling", IEEE Trans. ASSP, vol. 31, No. 5, Oct. 1983 by D. L. Duttweiler.
"Dynamically-reduced Complexity Implementation of Echo Cancellers", IEEE ICASSP '86, pp. 26.4.1-26.4.4 by V. K. Madisetti et al.
"Analysis of an Adaptive Technique for Modellling Sparse Systems", IEEE Trans. ASSP, vol. 37, No. 2, Feb. 1989 by Y-F Cheng.

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