IIR Filter Coefficients

bessel(n, scale) Returns coefficients for an analog Bessel filter of order n; scale controls the gain at cutoff. The output is used as an argument to one of the IIR filter functions.

butter(n) Returns coefficients for an analog Butterworth filter of order n. The output is used as an argument to one of the IIR filter functions.

cheby1(n, e) Returns coefficients for a Type I Chebyshev analog filter of order n; ripple is controlled by the parameter e. The output is used as an argument to one of the IIR filter functions.

cheby2(n, scale, atten) Returns coefficients for a Type II Chebyshev analog filter of order n with the lower edge of the stopband at s and stopband attenuation atten. The output is an argument to the IIR filter functions.

Arguments:

Note: