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ELLIPTIC FILTERS - HELP REQUIRED

Started by camdmag November 6, 2003
Hello

I am trying to construct an N-th order bandpass digital elliptic
filter using the command: [B,A] = ELLIP(N,Rp,Rs,Wn) where Wn is a two-
element vector, Wn = [W1 W2] with 0.0 < Wn < 1.0, with 1.0
corresponding to the Nyquist frequency.

The parameters Rp and Rs respectively define the Passband ripple, in
decibels and the Stopband attenuation, in decibels. Can someone
please explain to me what this actually means and how I go about
identifying values for Rp and Rs?

Thanks in advance

Calum Macdonald