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2.4.2.2.8 Comparison of time-frequency methods The complex character of
biomedical signals and their importance in health research and clinical practice
brought a wide variety of signal analysis methods into applications in biomedical
research. The most widespread are the spectral methods which make possible the
identification of the basic rhythms present in the signal. Conventional methods of
the analysis assumed stationarity of the signal, in spite of the fact that interesting
processes are often reflected in fast dynamic changes of signal. This implied the
application to the analysis of the signals methods operating in time-frequency space.
The available time-frequency methods can be roughly divided into two categories:
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