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
2014-7-24
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
2014-7-24
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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