If you have a real number series, if you perform a FFT analysis you get a
series of complex numbers that are the components in the frequency domain of
the function. If you perform an inverse FFT analysis from a complex number
series why do you get again a complex number series ?
Are the real parts the function from which you get the initial harmonic
components ?
What is the meaning of the imaginary parts ?
Best Regards
Ilver Belletti