filtering in frequency domain
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I have signal say 'data'; i want to cutt off all the frequency above 25 Hz in this signal. what should i do?
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Honglei Chen
il 24 Lug 2014
Your question is incomplete. You also need to know the sampling rate of the signal. Once you have the sampling rate, together with the cutoff frequency, you can design a filter using, say butter function and then use filter function to filter the signal.
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Honglei Chen
il 24 Lug 2014
so your sampling rate is 100 Hz. In that case, you can design a 4th-order (this is something you can choose but 4 is a good value to start with) Butterworth filter and filter signal x like
[b,a] = butter(4,25/(100/2));
filter(b,a,x)
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