Power Spectral Density for HRV, need help with pwelch function.
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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
on 29 Jul 2014
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:
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