Chebyshev Filter Frequency Response
Cuthbert Nyack
The poles of the Chebyshev filter approximation can be derived from
the Chebyshev polynomials or calculated from Butterworth poles.
The poles can be calculated to give a response which has an attenuation
of -3dB at the cut-off frequency or an attenuation equal to the
ripple at the cut off frequency.
The 2 applets below show the 2 possible responses. Red and pink
shows the amplitude with different scales, green the phase delay and cyan the group delay.
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COPYRIGHT © 2005 Cuthbert Nyack.