Boots – shoes – and leggings
Patent
1993-03-09
1996-06-04
Gordon, Paul P.
Boots, shoes, and leggings
36472401, 36472417, G06F 1710
Patent
active
055239625
ABSTRACT:
A digital filter, in which the operation time can be kept short even when the order of the filter is high. The digital filter comprises a first transversal filter TF.sub.1 which has an input terminal connected to a signal input terminal 10, first delay means DR.sub.1 which has an input terminal connected to the output terminal of first transversal filter TF.sub.1, a second transversal filter TF.sub.2 connected to the output terminal of the first delay means DR.sub.1, second delay means DR.sub.2 which has an input terminal connected to the output terminal of the second transversal filter TF.sub.2, adder AD which has one of the input terminals connected to the output terminal of the second delay means DR.sub.2, third delay means DR.sub.3 which has an input terminal connected to the output terminal of the adder AD and an output terminal connected to the signal output terminal, and a third transversal filter TF.sub.3 which has an input terminal connected to the output terminal of the aforementioned third delay means DR.sub.3 and an output terminal connected to the other input terminal of the aforementioned adder. In this digital filter, the chain configuration of the operator that determines the time needed for one cycle of operation is a multiplier-adder chain including one multiplier and one adder in each transversal filter. Consequently, its operation time is equal to the sum of the operation times needed by one multiplier and one adder and is unrelated to the order of each transversal filter, that is, the order of the digital filter.
REFERENCES:
patent: 4649507 (1987-03-01), Inaba et al.
patent: 4811263 (1989-03-01), Hedley et al.
patent: 5031132 (1991-07-01), Dolazza
Nishimura Hiroyuki
Yoshino Toshiaki
Donaldson Richard L.
Gordon Paul P.
Hiller William E.
Moise Emmanuel L.
Texas Instruments Incorporated
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