Dear all,
I have a question about signal processing (experimental data collection for vibration data);
I see, we define the frequency range of interest as: fSpan, then we can define the time resolution as: delta t = 1/(2*fSpan);
I do not understand where does this number '2' merge from? (is this because of the fact that in frequency domain we may have both positive and negative values unlike the time domain)?
Regards,
Alireza
Might simply be the sampling frequency has to be at least two times the frequency you try to measure. This has a theorem name, maybe the Nyquist frequency.
I think it might have shown up because it was supposed to be 1/2 (0.5), hence the ‘2’.
It is due to sampling theorem. A signal with bandwidth B can be represented by a signal sampled at least twice its bandwidth. Only then you can reconstruct the original signal from its samples. Therefore, sampling time is (1/(2B)).
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