How to decide cutoff frequency in designing low pass filter??

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Kapal 2016-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/296366-how-to-decide-cutoff-frequency-in-designing-low-pass-filter

评论： Kapal 2016-7-19

I am using matlab built in function fir1(N,Wn) for designing low pass filter using window technique. I have no idea is there any particular criteria to follow to decide normalized cutoff frequency?

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Adam 2016-7-19

Depends what your data is and what you are trying to do with it in low pass filtering it.

Kapal 2016-7-19

load oct1_fast % that loads actual signal with 3661 samples Smeasured=0.0189; % Sigma Measured mu=0; n2 = normrnd(mu,Smeasured,[length(x) 1]);

now I want to filter n2 (basically a white noise) and I am using window technique but how to get cutoff frequency? I know normalized cutoff (2*cutoff/fs) will be used in fir1 function .

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