21. Thus the noise temperature is proportional to the power spectral density of the noise, P / B. 22. That is the reason that we cannot use the energy spectral density as defined above in such cases. 23. A measurement of the acceleration spectral density ( ASD ) is the usual way to specify random vibration. 24. Many combinations of length scale and turbulence intensity give realistic power spectral densities in the desired frequency ranges. 25. Random signals and noise : probability, random variables, probability density function, autocorrelation, power spectral density . 26. Thermal noise is approximately white, meaning that its power spectral density is nearly equal throughout the frequency spectrum. 27. Where G xy ( f ) is the magnitude of the spectral density is denoted as | G |. 28. KZFT readily uncovers small deviations from a constant spectral density of white noise resulting from computer random numbers generator. 29. A stationary random process does have an autocorrelation function and hence a spectral density according to the Wiener Khinchin theorem. 30. For power spectral densities that decay less steeply than as, the integral in the numerator of does not converge.
