Spectral Density

$\backslash Psi\_x(f)\; =\; \backslash left|\; X(f)\; \backslash right|^2.$

$\backslash int\; \backslash left|\; x(t)\; \backslash right|^2\backslash ,\; dt\; =\; \backslash int\; \backslash Psi\_x(f)\backslash ,\; df.$

See also

• Power spectrum
• Fourier transform
• Spectral leakage
• Window function

External links

• Power Spectral Density Function - from Wolfram Research's "Time Series Documentation"

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