Recent content by harmonics

More specifically, I've seen the following normalisations used: multiplying by 1/N multiplying by 2/N multiplying by 1/sqrt(N) multiplying by 2/sqrt(N) multplying by sqrt(2) / N anyone who can shed light as to when these should be used?

If you take the absolute value of the FFT output, does that give you the amplitude? I am asking because I have seen example where that is taken as the amplitude, and examples were the absolute value is multiplied by either SQRT2 or by 2 to get the magnitude. So my question is what is...

How do you accurately identify the fundamental harmonic if you get a peak of similar amplitudes at frequencies that are really close to each other. And furthermore, once you identify the fundamental harmonic, are the second, third fourth harmonics just multiples of the fundamental frequency...