Program PSD: Digital determination of power spectral densities of random signals

Tha algorithm and procedure for the digital determination of power spectral densities from random signals are described. The program yields power spectra with a frequency range resolution of (1/256)f(MAX). Floating point arithmetic utilizing Varian supplied software is used with a consequent relatively long execution time of 210 seconds per analysis. This, however, is not a very serious drawback as the program was constructed to enable batch analyses to be carried out and can thus be run overnight. A significant improvement on execution time can be obtained by changing the program to fixed point double precision arithmetic. Should an even shorter execution time be desirable, the program must be rewritten to utilize the so-called Fast Fourier Transform algorithm.