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Normalized value of the pass-band frequency in butterworth filter.

  1. Jun 3, 2013 #1
    1. How do we find the normalized value of the pass-band and stop-band frequencies to be used in a butterworth filter?


    I am using the following code in matlab to design a butterworth filter. Can someone please tell me what is the pass-band/stop-band frequency of the filter in this code? 4000 is the number of samples in the signal.

    wp=180/4000; %wp=pass-band freq
    ws=360/4000; %ws-stop-band freq
    rp=1; rs=60; %rp, rs=ripple factors
    [n,wc]=buttord(wp,ws,rp,rs); %finding order n and cutoff frequency wc
    [a,b]=butter(n,wc); %low pass butterworth filter
     
  2. jcsd
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