Power Spectral Density for HRV, need help with pwelch function.

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Jonathon
Jonathon 2014-7-28
评论： Jonathon 2014-8-1
I'm looking to analyze heart rate variability data using PSD. I've looked into the MATLAB page and help for the pwelch function, but I am still confused about the scaling and units of the output. Does anyone have a recommendation for further reading into pwelch? I don't necessarily need to know the specifics of how it works, just how to properly plot the power and spectral density data with correct units.

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Daniel kiracofe
Daniel kiracofe 2014-7-29
if your input is in volts, then your output is V^2 / Hz. If your inputs are in some other unit, let's call it X, then your output is X^2/Hz. does that answer the question?
here's an example:
http://www.mathworks.com/help/signal/ref/pwelch.html#btulru8-5
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Jonathon
Jonathon 2014-8-1
Thanks for your help, that makes it more clear. If I were to plot using 10log10(pxx), would that be in dB then?

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