Fft how many points

Active Oldest Votes. Suggestion for your specific application: With relationship to choosing the sampling rate and number of bins for your specific application, if the 60 Hz and its harmonics are the dominant signal and you don't have other signal energy of significance then there is a simple solution that will work quite elegantly in accurately estimating each harmonic with minimum measurement distortion. Improve this answer. Dan Boschen Dan Boschen If there is other signals you are trying to see or isolate besides the harmonics this would make sense, but if the harmonics are quite strong relative to the background noise you can get away with 80 samples as I described.

You should look into windowing as well and get a better understanding of that as you will want to trade both resolution which was discussed here and dynamic range. Also no do not zero unwanted frequencies as a method of filtering worst way to filter.

Both of these are addressed in other posts; I will try to find them to point you there. Your question was not about filter design however, just how many points in the FFT-- so my answer was specific to observation of spectrum using the FFT. In this case you window the data in time and then take the FFT. Show 16 more comments. Mohammad M Mohammad M 1, 5 5 silver badges 12 12 bronze badges.

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