Dictionary:Power spectrum

1. A power-density versus frequency relationship. The power spectrum P(f) is the square of the amplitude-frequency response or the Fourier (cosine) transform of the autocorrelation function.

2. Occasionally implies cumulative power P ' (f), where P(f) is the power density at the frequency f:

$P^{'}(f^{'})=\int _{0}^{f^{'}}P(f)df$.

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