Chebyshev Filter Frequency Response
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.