Method for filtering digitized signals employing all-pass filter

Details Method for filtering digitized signals employing all-pass filter Method for filtering digitized signals employing all-pass filter

1990-07-05

1992-09-01

Mai, Tan V.

Boots, shoes, and leggings

G06F 1531

Patent

active

051445697

ABSTRACT:
A method for filtering digital input signals (e) makes use of all-pass filters of a first-class having the transfer function S1 and all-pass filters of a second-class having the transfer function S2, as well as all-pass filters of higher order, derived therefrom, having the transfer functions S1' and S1" or S2' and S2". The all-pass filters (10 to 36) are arranged in several stages in such a manner that the number of all-pass filters of higher order for a predetermined filter function is reduced. The output signals (A1 to A8) of the all-pass filters of the lowest order (22 to 36) are combined in a logical operation stage to filter output signals (d1,d8), the respective filter characteristic of which is determined by the logical operation. By the method of this invention, the steps necessary for the filtering can be carried out faster than in the prior art.

REFERENCES:
patent: 4566119 (1986-01-01), Peters
patent: 4825396 (1989-04-01), Gazsi
Saramaki, Tapio: "On the Design of Digital Filters as a Sum of Two All-Pass Filters". In: IEEE Transactions on Circuits and Systems, vol. CAS-32, No. 11, Nov. 1985, pp. 1191, 1192.
Jarske, Petri et al.: "Signal Processor Implementation of Variable Digital Filters". In: IEEE Transactions on Instrumentation and Measurement, vol. 37, No. 3, Sep. 1988, pp. 363 to 367.
Patney, Rakesh K. et al.: "A Different Look at Roundoff Noise in Digital Filters". In: IEEE Transactions on Circuits and Systems, vol. CAS-27, No. 1, Jan. 1980, pp. 59 to 62.
Regalia, Phillip A.: "Tree-Structured Complementary Filter Using All-Pass Sections". In: IEEE Transactions on Circuits and Systems, vol. CAS-34, No. 12, Dec. 1987, pp. 1470 to 1483.

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