Description: Autocorrelation function Rxx (tao) can learn the same random sample at different times the degree of similarity between the waveforms. Since the power spectral density Sxx (f): reflects the correlation function of random signals in time domain expression of itself and other signals at different times of internal relations. When the random signal is zero mean, autocorrelation function and power spectral density function of each other since the Fourier transform pair.
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auto-powerspectrum.vi