Digital filters

Details Digital filters Digital filters

1985-03-14

1988-09-13

Harkcom, Gary V.

Boots, shoes, and leggings

36472419, G06F 738

Patent

active

047713968

ABSTRACT:
A transversal finite impulse response, adaptive digital filter comprises three stages (10, 11, 12). The stage (10) is a memory stage which stores input samples x and coefficients. The second stage (11) is an arithmetic stage which forms convolution products and accumulates the product to provide an output. The third stage (12) forms update values for updating the coefficients according to a predetermined algorithm. The stages are coupled by buses (14, 15) and data transfer between the stages via the buses is controlled by a control unit (18). The filter operates so that convolution products are formed during a first part of each sample period and update values are formed during a second part of each sample period for use in the subsequent sample period.

REFERENCES:
patent: 4349889 (1982-09-01), van den Elzen et al.
patent: 4425483 (1984-04-01), Lee et al.
patent: 4550415 (1985-10-01), Debus, Jr. et al.
patent: 4571732 (1986-02-01), Pirani et al.
patent: 4580275 (1986-04-01), Pirani et al.
patent: 4594725 (1986-06-01), Desperben et al.
B. Widrow, "Adaptive Filters" in Aspects of Network and System Theory", edited by R. E. Kalman and N. De Claris pub. Holt, Rinehart and Wilson, ISBN 03-0772200-6; Relevant as General background on the subject of Adaptive Filters.
K. Ochia, T. Araseki and T. Ogihara, "Echo Canceller with Two Echo Path Models," IEEE Transactions on Communications, vol. 25, No. 6, pp. 589-595, Jun. 1977, describes a two echo path modem.
B. V. Rao and T. Murali, "A New Design for Digital Adaptive Filters", Int. J. Electronics, vol. 55, No. 3, pp. 473-477, 1983; discusses the problems of limit cycling.
K. Takahashi, T. Sakamoto and I. Tokizawa, "A Cascadable Echo Canceller" Int. Conf. Commun., 1982 Jun. 13-17, Philadelphia, (IEEE).
I.E.E. Proceedings, vol. 130, No. 2, sections A a I, part E. Mar. 1983, pp. 42-45, Old Working, Surrey, GB: J. O. Normile et al.: "Adaptive Filtering with Finite Wordlength constraints".
IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-31, No. 3, Jun. 1983, pp. 541-549, New York, U.S.: C. F. N. Cowan et al.: "A Digital Adaptive Filter Using a Memory-Accumulator Architecture: Theory and Realization".
ICASSP 84 Proceedings, vol. 1, Mar. 19-21, 1984, San Diego, Calif., U.S., pp. 3.4.1-3.4.4, IEEE; C. R. South et al.; "Extension Facilities and Performance of an LSI Adaptive Filter".

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