How to find out roll-off from magnitude response of filter in matlab
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Commented: 632541 on 23 Sep 2021
How to find out roll-off from magnitude response of filter in matlab?
This is from doc frequency response of matlab site
Chunru on 23 Sep 2021
fs = 2000;
[b,a] = butter(9,400/(fs/2));
[h, f] = freqz(b,a,16384,fs);
h = 20*log10(abs(h));
[~, i3db] = min(abs(h - 10*log10(1/2)));
f3db = f(i3db);
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