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Butterworth filter frequency response with 2nd order, 3rd order and 4th order figures

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suresh
suresh 2012-7-19
hi,
i want butterworth filter frequency response with 2nd order, 3rd order and 4th order in a single plot..

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Honglei Chen
Honglei Chen 2012-7-19
Just as an example
[b1,a1] = butter(2,0.5);
[b2,a2] = butter(3,0.5);
fvtool(b1,a1,b2,a2)

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