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Butterworth filters fall into a class of filters with magnitude frequency response that is "maximally flat" magnitude. Butterworth filters have no ripple either in the passband nor in the stopband.
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Digital Butterworth filter design error
I cannot run your code because I have not matlab on this pc, but I can try to give you some advice.
The first thing I will check is the way you defined the cut-off frequencies. The Matlab function us …