H - Electricity – 03 – H
Patent
H - Electricity
03
H
328/0.3
H03H 17/06 (2006.01) H03H 17/02 (2006.01)
Patent
CA 1280808
"Calculation of Filter Factors for Digital Filter" ABSTRACT OF THE DISCLOSURE An apparatus for calculating a filter factor for a digital filter which can be made with a simple construction and in which the time period for calculation can be shortened as compared with conventional techniques. The apparatus comprises an inputting 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 inputting 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 said division means.
556581
Ishikawa Seiichi
Kawamura Akihisa
Matsumoto Masaharu
Satoh Katsuaki
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Ltd.
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