Generalized Digital Butterworth Filter Design - Example

The Matlab commands below produce the filter illustrated in the figure. The Matlab programs can be down loaded from the previous page.

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        Z = 23;                 % numerator degree
        P = 4;                  % denominator degree
        wo = 0.4585*pi;         % half-magnitude frequency
        [b,a,b1,b2] = general_butter(Z,P,wo);