Take the FFT of both original and filtered signals and display them. Use subplot(2,2,n) to display the 4 signals all in one figure.
Question
Hi, I have the question below: Part 1: 1) I do not know what to design the filters to be, based on what? 2) I am not sure if I displayed the magnitude spectrum correctly. 3) how do i process the signal by the filter? Part 2: How do I filter by using FFT processing? please find my code is in the M-FILE attached . Your help is appreciated.
Expert Answer
Neeta Dsouza
PhD Expert
Answered Aug 14, 2026
It looks like they don't care what filter you use. Why not just use a rect filter (a box)? You can do this with just convolving with ones.
firFilter = ones(1, 21)/21; % Or whatever window width you want. out = conv(in, firFilter, 'same');
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