advantage of chebyshev filter over butterworth
in [Matlab]
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From: Tanzilur Rahman on 28 Dec 2009 01:34 Hi, can anyone explain briefly the advantage of chebyshev filter over butterworth or other time domain filtering technique. All i know is chebysehv has better attenuation in pass band than the butterworth while it has ripples in stop band on the down side. Thanks in advabnce.
From: Rune Allnor on 28 Dec 2009 04:09 On 28 Des, 07:34, "Tanzilur Rahman" <tanzil_...(a)yahoo.com> wrote: > Hi, > can anyone explain briefly the advantage of chebyshev filter over butterworth or other time domain filtering technique. All i know is chebysehv has better attenuation in pass band than the butterworth while it has ripples in stop band on the down side. The different filters have *different* properties, not 'better' or 'worse'. The Chebychev filter of obtains a steeper roll-off than a Butterworth filter of the same order, which means the digital version of the Chebychev requires less computational load, or the analog version fewer components than the Butterworth. This cheaper or simpler filter does not come for free, as the frequency response contains ripples. Which may or may not be a problem. So it is up to you, as designer, to determine what is more important: Smooth frequency response or simple/cheap filter. And then choose what filter type to use. Similar arguments and trade-offs apply to all the different filter types. Rune
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