GLOSSARY OF TERMS USED IN TIME SERIES ANALYSIS
OF CARDIOVASCULAR DATA
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MARGINAL CONDITIONS

Conditions, satisfied by certain time-frequency distributions, on the integrals over frequency and over time

If TF(t,f) is the time-frequency distribution of the signal s(t), defined for t between 0 and t1 and f between 0 and f1, then the marginal conditions are satisfied if

where ESD(f) is the energy spectral density of the signal (the intensity of energy per unit frequency), and |s(t)|2 is the signal power at time t.

Cohen L (1989) Time-frequency distributions- A review Proc. of  the IEEE, 77, 941-981

(PC 20-02-2000)

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