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Measuring the degree of non-stationarity by using the Wigner-Ville spectrum

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1 Author(s)
Martin, W. ; Bot. Inst. Univ. of Bonn, Bonn, F.R.G.

The Wigner-Ville spectrum is the only conjoint time-frequency representation of the second order properties of non-stationary random signals which is real-valued and compatible with linear filtering and modulation. Pseudo Wigner estimators are known to form a class of estimators being more flexible than short time periodograms: They give uncorrelated estimates for appropriately spaced neighboured frequencies allowing separately to measure the degree of non-stationarity for each band of frequencies. Using the model of quasi stationary processes, their stability and precision are defined as a measure of their character of non-stationarity. The performances are then tested on simulated data and successfully applied to the problem of classifying biological time-keeping facilties.

Published in:

Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '84.  (Volume:9 )

Date of Conference:

Mar 1984