11. Methods developed in the 1980s allowed simple images to be reconstructed from this power spectrum information. 12. Specifically, it calculates the first two moments of the power spectrum , namely the mean and variance. 13. 1 . Bartlett suggested a method that averages the spectral estimates to calculate the power spectrum . 14. A QPO is identified by performing a power spectrum of the time series of the X-rays. 15. For examples of physical effects due to the phase of signals with the same power spectrum . 16. These fluctuations are traditionally described by the two dimensional autocorrelation function, or by the corresponding Fourier power spectrum . 17. The other measure used for SNR was based on the inter-spike interval histogram instead of the power spectrum . 18. Is defined as the cross-power spectrum . 19. The power spectrum density P ( \ omega ) of the position of the bead is experimentally available. 20. Correlation spectrometers like the Michelson interferometer vary the time lag between signals obtain the power spectrum of input signals.
