DocumentCode :
2999945
Title :
The relationship between Wigner-Ville and evolutionary spectra for frequency modulated random processes
Author :
Hammond, J.K. ; Lee, J.S. ; Harrison, Rob
Author_Institution :
University of Southampton, Southampton, England
Volume :
11
fYear :
1986
fDate :
31503
Firstpage :
2327
Lastpage :
2330
Abstract :
TWo major candidates for ´time-frequency´ spectral characterisation of nonstationary processes are the Wigner-Ville spectrum and Priestley´s evolutionary spectral density. There has been much general discussion on the relative merits of these two spectra, but little on specific comparisons. This is probably because it is difficult to construct theoretical evolutionary spectra for realistic examples. This paper is concerned with illustrating a theoretical relationship between these spectra by a series of examples. The examples include both uniformly and nonuniformly modulated cases. The nonuniformly modulated examples include a nonstationary process Which is ´frequency modulated´ in form for which the principle of ´covariance equivalence´ allows the description of the evolutionary spectrum.
Keywords :
Damping; Frequency modulation; Narrowband; Oscillators; PROM; Random processes; White noise;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '86.
Type :
conf
DOI :
10.1109/ICASSP.1986.1168689
Filename :
1168689
Link To Document :
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