File: iirfilt.dem

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////////////////////////
//DISCRETE IIR FILTERS//
////////////////////////
// Copyright INRIA
 
//Low pass filter (length 5, type cheb1, cut-off .2)
   hz=iir(5,'lp','cheb1',[.2 0],[.05 .05]);
   [hzm,fr]=frmag(hz,256);
   plot2d(fr',hzm')
   xtitle('Discrete IIR filter : low pass  fr <0.2',' ',' ');
   halt()
   xbasc(); 
//Band pass filter (length 3, type ellip, cut-offs .15 and .25)
   hz=iir(3,'bp','ellip',[.15 .25],[.08 .03]);
   [hzm,fr]=frmag(hz,256);
   plot2d(fr',hzm')
   xtitle('Discrete IIR filter band pass  0.15<fr<0.25 ',' ',' ');