THE REALIZATION AND PERFORMANCE ANALYSIS OF NOISE SPECTRAL DENSITY-ESTIMATION USING A DIGITAL BANDPASS FILTER

The continuous spectral estimation of non-ARMA stochastic processes (e nclosed noise processes), has received relatively little attention in the traditional signal processing literature. The concept of the appli cation of bandpass filters to spectral analysis was introduced more th an 25 years ago; however, a practical measurement instrument using ban dpass filters can only make noise measurements at a few discrete frequ ency points. In this paper, a noise spectral density measurement over a wide frequency range, using a recursive digital bandpass filtering a lgorithm, has been realized. The variance and bias in the equi-bandwid th measurement and the equi-e measurement have been discussed. Finally , the algorithm's parameters are decided according to the measurement accuracy and fidelity.