File: find_freq.cat

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find_freq(1)                   Scilab Function                   find_freq(1)
NAME
  find_freq - parameter compatibility for elliptic filter design

CALLING SEQUENCE
  [m]=find_freq(epsilon,A,n)

PARAMETERS

  epsilon   : passband ripple

  A         : stopband attenuation

  n         : filter order

  m         : frequency needed for construction of elliptic filter

DESCRIPTION
  Search for m such that n=K(1-m1)K(m)/(K(m1)K(1-m)) with

  m1=(epsilon*epsilon)/(A*A-1);

  If m = omegar^2/omegac^2, the parameters epsilon,A,omegac,omegar and n are
  then compatible for defining a prototype elliptic filter.  Here, K=%k(m) is
  the complete elliptic integral with parameter m.

SEE ALSO
  %k

AUTHOR
  F. D.