Boots – shoes – and leggings
Patent
1988-01-15
1990-01-23
Kemeny, Emanuel S.
Boots, shoes, and leggings
36472416, G06F 1531
Patent
active
048962856
ABSTRACT:
An apparatus for calculating a filter factor for a digital filter which can be simply constructed and in which the time period for calculation can be shortened as compared with conventional techniques. The apparatus has an input circuit for inputting a desirable frequency property, a division circuit for dividing the inputted frequency property into a plurality of frequency bands, and a calculating circuit for obtaining filter factors for realizing a frequency property of each of the divided frequency bands. The input circuit inputs the frequency property with a frequency resolution corresponding to the number of the filter factors. The division circuit performs a correction for a division so that the frequency property becomes zero from a frequency over the high cut-off frequency of a band-pass filter toward the Nyquist frequency of the frequency band corresponding to the transversal filter, the Nyquist frequency being 1/2 of the sampling frequency. The calculating circuit has a transformation unit for performing a Hilbert transformation or a linear phase transformation with respect to the respective frequency properties divided by the division circuit.
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IEEE Transactions on Biomedical Engineering, vol. BME-32, No. 12, Dec. 1985, pp. 1052-1060, IEEE, New York, U.S.; J. A. Van Alste et al.: "Removal of base-line wander and power-line interference from the ECG by an efficient FIR filter with a reduced number of taps".
Agen, No. 9, Jul. 1969, pp. 25-29, Zurich, CH; F. Pellandini et al., "Synthese des filtres digitaux sans contre-reaction".
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 6, Dec. 1986, pp. 1529-1541, IEEE, New York, U.S.; A. Dembo et al.: "WMMSE design of digital filter banks with specified composite response".
Electronics Letters, vol. 8, No. 15, 27th Jul. 1972, pp. 380-382, Hitchin, G. B.; G. D. Cain: "Hilbert-transform description of linear filtering".
The Transactions of the IECE of Japan, vol. E 63, No. 8, Aug. 1980, pp. 596-598, Tokyo, JP; S. Shinnaka: "Recursive realizations of N-th order FIR filters with linear phase designed by (N-1) point frequency sampling techniques".
Ishikawa Seiichi
Kawamura Akihisa
Matsumoto Masaharu
Satoh Katsuaki
Kemeny Emanuel S.
Mai Tan V.
Matsushita Electric - Industrial Co., Ltd.
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