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

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Clarification Needed: Power Spectral Density of Real Signal

This stems from Parseval's theorem. For any signal, $\int_{-\infty}^{+\infty}|x(t)|^{2}\mathrm dt = \int_{-\infty}^{+\infty}|X(f)|^{2}\mathrm df$ and hence for a real signal, the one sided PSD must be …
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