| 摘要 |
A digital filter having the desired frequency characteristic can be designed through an extremely simple processing, which comprises: generating a plurality of filters, by a frequency shift calculation to a basic filter having a passband width equal to a sampling frequency divided by an integer, from the frequency/amplitude characteristic of the basic filter being shifted by a prescribed frequency so that the adjacent filter banks are overlapped each other at the part of one-half amplitude; and obtaining the final filter coefficients by arbitrarily selecting one or more filters among the basic filter and a plurality of frequency-shifted filters and adding the final filter coefficients thereof.
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