Normalization of Power Spectral Density
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Hey everybody :)
When calculating the PSD from the fft, one apparently needs to normalize | FFT(signal)|^2 with a factor of (1/(fs*N)) where fs = sampling frequency and N = length of signal (see for example "Power Spectral Density Estimates Using FFT" https://www.mathworks.com/help/signal/ug/power-spectral-density-estimates-using-fft.html.
I was wondering where this factor comes from. I would be very grateful for your help :)
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dpb
2020년 12월 31일
It's to make the output amplitude consistent regardless of the frequency resolution of the measurement. See https://community.sw.siemens.com/s/article/what-is-a-power-spectral-density-psd for a nice tutorial.
It would be helpful if TMW would put some of this information in their documentation given their user base often is new to the field...hint, hint. :)
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