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An elliptic or Cauer filter can be generated with

cauer ( <order> , <ripple> , <stopband> ) ;
<order> : integer; order,
<ripple> : real; passband ripple in dB,
<stopband> : real; normalized lowest stopband frequency.
The bandwidth of this filter, defined in the same way as for Chebyshev filters, is 1rad/s. The stopband begins at <stopband>, so this variable must be larger than 1.