FIR filtering & FFT processing for a signal
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Hi, I have the question below:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/146351/image.png)
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.
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Image Analyst
2014-12-6
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');
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.
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