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The Power Spectral Density (PSD) is the distribution of signal power over frequencies.

1
vote
The simple answer: when you take a power measurement using some piece of test equipment (such as a spectrum analyzer or an RF power meter), the reported value indicates the amount of power measured wi …
answered Apr 11 '13 by Jason R
26
votes
The power spectral density describes the density of power in a stationary random process $X(t)$ per unit of frequency. By the Wiener-Khinchin theorem, it can be calculated as follows for a wide-sense …
answered Oct 16 '12 by Jason R
7
votes
If the definition of the flatness dictates that you use a power spectrum, then yes, you should square the magnitudes as the reference from the SciPy documentation indicates. In the equation that you r …
answered Apr 13 '12 by Jason R