Boots – shoes – and leggings
Patent
1985-11-14
1989-08-29
Harkcom, Gary V.
Boots, shoes, and leggings
G03F 738
Patent
active
048624039
ABSTRACT:
A digital filter has an input terminal provided with an input digital signal. A delay circuit connected to the input terminal produces a plurality of delayed digital signals each having a different delay time with respect to the input digital signal. A first circuit adds the input digital signal and/or the plurality of delayed digital signals to one or more digital coefficient signals of the same value so as to produce one or more added digital signals. A circuit multiplies the one or more respective digital coefficient signals by the one or more added digital signals and/or one or more of the plurality of delayed digital signals to produce a plurality of multiplied digital signals. A second circuit adds the plurality of multiplied digital signals to produce an output digital signal, and a circuit connected between the delay circuit and a multiplying circuit increases the one or more added digital signals and/or the one or more of the plurality of delayed digital signals by one or more predetermined numbers of times, whereby the one or more respective digital coefficient signals have inversely proportional values corresponding to the one or more predetermined numbers of times of the values of the one or more added digital signals and/or the one or more of the plurality of delayed digital signals.
REFERENCES:
patent: 3521041 (1970-07-01), Blerkom et al.
patent: 3949206 (1976-04-01), Edwards et al.
patent: 4031378 (1977-06-01), Le Comte
patent: 4044241 (1977-08-01), Hatley, Jr.
patent: 4121295 (1978-10-01), Witt
Goncalves et al., "LSI Module for the Implementation of Digital Filters", IEE Proc., vol. 128, Pt. F, No. 6, Nov. 1981, pp. 353-358.
Bywater et al., "A Real-Time Non-Recursive Digital Filter", Int. J. Electronics, Sep. 1978, vol. 45, No. 3, pp. 265-271.
Iwase Seiichiro
Yamazaki Takao
Dowden Donald S.
Eslinger Lewis H.
Harkcom Gary V.
Mai Tan V.
Sony Corporation
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