GLOSSARY OF TERMS USED IN TIME SERIES ANALYSIS
OF CARDIOVASCULAR DATA
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CHOI-WILLIAMS DISTRIBUTION

Time-frequency distribution derived from the Wigner-Ville distribution

The Choi-Williams distribution of a signal s(t) is defined as:

where is a factor controlling the suppression of cross-terms and the frequency resolution. C(t,f) becomes the Wigner-Ville distribution when . C(t,f) satisfies the marginal conditions for all the values of .

Pola S et al (1996) Estimation of the power spectral density in nonstationary cardiovascular series: assessing the role of the time-frequency representations (TFR) IEEE- BME 43

(PC 25-02-2000)

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