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Вот, что написано в Самом Матлабе(!) про это дело.
cheby1
Chebyshev Type I filter design (passband ripple)
Syntax[b,a] = cheby1(n,Rp,Wn)
[b,a] = cheby1(n,Rp,Wn,'ftype')
[b,a] = cheby1(n,Rp,Wn,'s')
[b,a] = cheby1(n,Rp,Wn,'ftype','s')
[z,p,k] = cheby1(...)
[A,B,C,D] = cheby1(...)
Descriptioncheby1 designs lowpass, bandpass, highpass, and bandstop digital and analog Chebyshev Type I filters. Chebyshev Type I filters are equiripple in the passband and monotonic in the stopband. Type I filters roll off faster than type II filters, but at the expense of greater deviation from unity in the passband.
Хотя как в рекурсивный фильтр полюса втыкають, не понимаю...
E-mail: 
info@telesys.ru
