Boots – shoes – and leggings
Patent
1996-09-30
1998-07-28
Ngo, Chuong Dinh
Boots, shoes, and leggings
36472419, 84661, G06F 1710, G10H 500
Patent
active
057870233
ABSTRACT:
A digital filter device, for an electronic musical instrument, comprises: filter coefficient generation means for generating a set of filter coefficients in consonance with a designated resonance frequency and Q; and filter operation means for performing an operation for an IIR digital filter, relative to an input tone wave, by using the filter coefficient, which is generated by the filter coefficient generation means, with the filter coefficient generation means including trigonometric function output means, for outputting a trigonometric function value that is consonant with the resonance frequency, and filter coefficient calculation means, for calculating a plurality of filter coefficients based on the Q and the trigonometric function value that is generated by the trigonometric function output means, and with the filter coefficient calculation means having segment approximation means for performing, within a range of x.gtoreq.0, segment approximation of a function f(x)=x/(1+x), or f(x)=1/(1+x), and for outputting the filter coefficients.
REFERENCES:
patent: 4907484 (1990-03-01), Suzuki et al.
patent: 5140541 (1992-08-01), Sakata et al.
patent: 5270481 (1993-12-01), Matsunaga et al.
Kabushiki Kaisha Kawai Gakki Seisakusho
Ngo Chuong Dinh
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