Method for processing a signal in a CSD filter and a circuit the

Details Method for processing a signal in a CSD filter and a circuit the Method for processing a signal in a CSD filter and a circuit the

1996-09-20

1998-11-03

Moise, Emmanuel L.

Boots, shoes, and leggings

364724011, 36472419, 348614, 370290, 370291, G06F 1710, H04N 5213

Patent

active

058318801

ABSTRACT:
A method for processing a signal in a CSD filter includes the steps of obtaining real coefficients optimized to desired filter characteristics, calculating scaling factors for each real coefficient which minimizes errors between the real coefficients and converted CSD codes, producing optimum CSD coefficients by using the calculated scaling factors, and filtering input data by using the optimum CSD coefficients. In the method of the present invention, conversion of the real coefficients into the CSD coefficients is performed in the time domain, thereby improving operating speed and increasing bit resolution with the number of non-zero digits fixed, as compared to conversion in the frequency domain. As a result, the present invention can be applied to an adaptive filter and a polyphase filter.

REFERENCES:
patent: 4953026 (1990-08-01), Kobayashi et al.
patent: 4967388 (1990-10-01), Tate
patent: 5014263 (1991-05-01), Vairavan et al.
patent: 5058047 (1991-10-01), Chung
patent: 5479363 (1995-12-01), Wilson, Jr. et al.
patent: 5590065 (1996-12-01), Lin
"FIR Filter design over a Discrete Powers-of-Two Coefficients Space" by Y.C. Lim and B.R. Parker, IEEE Trans. Acoust., Speech and Signal Processing, vol. ASSP-31, pp. 583-591, Jun. 1983.
"A Simple Design of FIR Filters with Powers-of-Two Coefficients" by Q. Zhao and Y. Tadokoro, IEEE Trans. on Circuit and Systems, vol. 35, No. 5, pp. 566-570, May 1988.
"An Improved Search Algorithm for the Design of Multiplierless FIR Filters with Powers-of-Two Coefficients" by Henry Samueli, IEEE Trans., on Circuit and Systems, vol. 36, No. 7, pp. 1044-1047, Jul. 1989.

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