Analog filter design consists of Butterworth filters, Chebyshev filters, elliptic filters, as well as 10 pieces of first-order Bessel filter is the square of the frequency and phase frequency response curves, Bessel filters are characterized by: at 0, when fight with the most flat group delay, and in the entire pass-band group delay is almost constant

filter\chebshev_2.m
......\butterworth.m
......\ellipapfilter.m
......\bessel.m
......\dbtex1.m
......\bessl.fig
......\butterworth.fig
......\chebshev_1.m
filter

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