Filter Banks for Power Spectrum Estimation with a Logarithmically Uniform Frequency Resolution

摘要

Characteristics of different analog bandpass filter banks generating power spectra with a logarithmically uniform frequency resolution and a constant relative analysis bandwidth are discussed. Equivalent digital filters are derived for use with digital spectrum analyzers. As an example of application, an algorithm for digital third octave band analysis is demonstrated and used for evaluation of fluctuation power spectra characterizing the real part of impedance of standard RC circuits. Keywords: Digital filters; Noise analysis; Power spectra. (jhd)