Should I use the absolute value of fast Fourier transform or the conjugate in signal analysis?
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I found this example in MATLAB https://www.mathworks.com/help/matlab/math/fft-for-spectral-analysis.html and I saw that they used the value of conjugate.
Pyy = Y.*conj(Y)/251;
I tried to calculate the magnitude using abs function rather than this line. I get nearly the same output.
Therefore, I am puzzled; should I use the way in this example or the magnitude way?