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To increase the frequency resolution of your signal, if it can be done by increasing the sampling rate at measurement, this would be the ideal way to improve frequency resolution.


Zero padding does not increase the frequency resolution— it just interpolates more samples in frequency but does not give you any more information. The frequency resolution in Hz of an non-windowed (rectangular window) Fourier Transform is 1/T where T is the length of your time domain waveform in seconds. You must have a longer data sample in order to get ...

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