I have 20k voltage output at 1ms sampling rate. I already done fft in matlab now now I want to apply low pass filter with cut off freq=400hz. How can I do it?

Thanks

]]>I used it and the result is good but i don’t know how does it work. ]]>

Also, the “real” would not be necessary if you ensure conjugate symmetry before the ifft(). For even N, keep the first N/2+1 elements and set the last N/2-1 to conj(fliplr(s_fft_data_v(2:N/2))). I think that would be the correct syntax in your case, but you probably want to check the details to make sure.

I do hope these ideas are helpful and apologies if I’m pointing out something you’re already aware of and intentionally omitting!

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