Random signals and systems
Improving the readability of time-frequency and time-scalerepresentations by the reassignment method
IEEE Transactions on Signal Processing
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Reassignment is a non-linear techniquewhich can improve on the localization of a spectrogram by movingits values according to a suitable vector field. Statisticalproperties of spectrogram reassignment vectors are investigatedin detail. Closed form expressions are given when the observationconsists in a non-random component embedded in white Gaussiancircular noise, and when the analysis window is Gaussian. Anextension to arbitrary windows is also proposed and theoreticalclaims are supported by numerical simulations.