Multichannel Systems MC_Rack Manual - Manual (Page 143)

MC_Rack Features
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4.12.2 Filter Characteristics
Bessel
A Bessel filter is a type of linear filter with a maximally flat group delay (maximally linear phase
response). Analog Bessel filters are characterized by almost constant group delay across the entire
passband, thus preserving the wave shape of filtered signals in the passband.
Butterworth
The Butterworth filter is designed to have a frequency response which is as flat as mathematically
possible in the passband.
Chebyshev
Chebyshev filters are analog or digital filters having a steeper roll-off than Butterworth filters.
Chebyshev filters have the property that they minimize the error between the idealized filter
characteristic and the actual over the range of the filter, but with ripples in the passband. Because
of the passband ripple inherent in Chebyshev filters, filters which have a smoother response in the
passband but a more irregular response in the stopband are preferred for some applications.