Pulse or digital communications – Repeaters – Testing
Patent
1980-10-23
1983-05-31
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375103, 333 18, 364724, H04L 2503, H04B 314
Patent
active
043864309
ABSTRACT:
A recursive automatic equalizer is described for implementing the telephone equalization function at a line circuit which may be multiplexed between a plurality of telephone subscriber sets. A recursive digital filter structure having programmable coefficients minimizes the error between the equalizer input and a reference signal. The recursive filter transfer function is variable via feedback coefficient update, with respect to its input and the reference signal. The recursive filter coefficients are adaptively changed to rapidly converge to a final value based upon a mean square error algorithm. The desired filter transfer function can be achieved with a low number of coefficients, for example, five, rather than the heretofore high number of coefficients required in non-recursive filter structures.
REFERENCES:
patent: 3997770 (1976-12-01), Claasen et al.
patent: 4021738 (1977-05-01), Gitlin
patent: 4038536 (1977-07-01), Feintuch
patent: 4228517 (1980-10-01), Constant
Zaheer Ali, "A Configurable Parallel Arithmetic Structure for Recursive Digital Filtering" 17-19 May 1978 Conference Proceeding of the 1978 IEEE Internation Symposium On Circuit and System.
Don Johnson, "Variable Digital Filters Having a Recursive Structure" Feb. 1979 IEEE Transaction on Acoustics, Speech and Signal Processing vol. ASSP-27 No. 1 pp. 98-99.
Parker et al., "A Two Dimensional Adaptive Recursive Digital Filter in Image Processing" 17-19 May 1978 by Conference Proceeding of the 1978 IEEE International Symposium on Circuit and System, N.Y. USA pp. 308-12-312.
Design and Realization of LSI Processor for Digital Signal Processing by Murano et al. Fujitsu Sci. & Tech. Journal (Japan) vol. 15 No. 1 Mar. 1979 pp. 39-53.
Adaptive Equalization With a Second Order Gradient Algorithm by Devieux Contributed to Proceeding of Symposium on Computer Processing in Communication Poly Inst. of Brooklyn Apr. 8-10 1969 pp. 665-681.
Introduction to Microprocessors, Software, Hardware, Programming by Leventhal 1978, pp. 57-60.
Chin Stephen
International Telephone and Telegraph Corporation
Morris Jeffrey P.
O'Halloran John T.
Safourek Benedict V.
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