Duplex adaptive digital filter and method of operation

Details Duplex adaptive digital filter and method of operation Duplex adaptive digital filter and method of operation

1994-06-20

1996-07-09

Envall, Jr., Roy N.

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370 321, 379411, G06F 1700, H04J 100, H04J 300, H04M 100

Patent

active

055351492

ABSTRACT:
An adaptive filter system has a first and a second filter subsystem of like construction, each having a series of delay elements for imparting a unit delay of one sampling interval to successive input samples in order to concurrently obtain a set of input samples of different sampling times. Each set of input samples are multiplied by respective coefficients, and the resulting values are added together for comparison with a reference signal. The coefficients are updated for each new set of input samples. For such updating, the first subsystem uses the step gain that is fixed at one, whereas the step gain used by the second subsystem is varied with time for faster convergence and smaller convergence error.

REFERENCES:
patent: 3860768 (1975-01-01), Wehrmann
patent: 4021623 (1977-05-01), Suyderhoud et al.
patent: 4232400 (1980-11-01), Yamamoto et al.
patent: 4479036 (1984-10-01), Yamamoto et al.
patent: 5237562 (1993-09-01), Fujii et al.
patent: 5247512 (1993-09-01), Sugaya et al.
patent: 5263020 (1993-11-01), Yatsuzuka et al.
patent: 5315585 (1994-05-01), Iizuka et al.
Yamamoto et al., An Adaptive Echo Canceller with Variable Step Gain Method; The Transactions of the IECE of Japan, vol. E 65, No. 1, Jan. 1982.
Fujii et al., Optimum Adjustment of Step Gain in Learning Indentification Algorith; The Transactions of the Institute of Electronics, Information and Communication Engineers; vol. J75-A; No. 6; Jun. 1992.
Claasen et al., Comparison of the Convergence of Two Algorithms for Adaptive FIR Digital Filers; IEEE Transactions on Acoustics, Speech, and Signal Processing; vol. ASSP-29, No. 3, Jun. 1981.
Mori et al.; Proposal of Noise Level Estimation Method for Improvement of Initial convergence Characteristics and Variable Step Gain Algorithm; collection of papers of Sumulation-Technology conference of twelve; Published Jun. 23, 1993; pp. 257-260.

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