Normalization of Power Spectral Density
301 views (last 30 days)
Show older comments
Sandro Camenzind
on 31 Dec 2020
Commented: Sandro Camenzind
on 31 Dec 2020
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 :)
0 Comments
Accepted Answer
dpb
on 31 Dec 2020
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. :)
More Answers (0)
See Also
Categories
Find more on Parametric Spectral Estimation in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!