Theoretical: Why use trapz to calculate absolute power?
2 views (last 30 days)
Show older comments
Hi everybody,
This more of a theoretical question and since I'm not an engineer I apologize in advance for any trouble understanding my question. I've recently seen a script that first calculated the power using pwelch method and then used trapz to calculate the integral between two frequency bins, like:
[Pxx W] = pwelch(data, window, overlap);
Pow1 = [Pow1 ; trapz(Pxx(2:6))];
Does anyone know the possible reason to take the integral of the frequencies when you are interested in power? And does this represent something different?
Thanks,
Eric
0 Comments
Answers (1)
Vinod Sudheesh
on 1 Apr 2015
The "pwelch" function returns the power spectral density (PSD) estimate. To compute the power contained in a frequency range, the PSD should be integrated over the required frequency range.
0 Comments
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!