What are the advantages and disadvantages the IIR Filters: Butterworth filter, Chebyshev I Filter, Chebyshev II Filter and Elliptic Filter? The frequency response charts shown below, show the differences between the various design prototype methods for a 5th order lowpass filter with the same specifications. As seen, the Butterworth response is the slowest to roll-off and the Elliptic the fastest.
Butterworth (5th order)
Filter characterstics
Elliptic (5th order)
Filter characterstics
Chebyshev type I (5th order)
Filter characterstics
Chebyshev type II (5th order)
Filter characterstics
The Bessel prototype is not supported, as the Bilinear transform warps the linear phase characteristics. However, a Bessel filter design method is available in ASN FilterScript