Power Spectral Density
The Fourier transform of the autocorrelation function
is
called the power spectral density (PSD), or power
spectrum, and may be denoted
![$\displaystyle S_x(\omega) \isdef \hbox{\sc DTFT}_\omega(r_x).
$](http://www.dsprelated.com/josimages_new/sasp2/img2675.png)
When the signal
![$ x$](http://www.dsprelated.com/josimages_new/sasp2/img38.png)
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Sample Power Spectral Density
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Sample Autocorrelation