and the output of body system was tested by using regular excitation as pulse input.The distribution of time-frequency spectrum and power energy ratio for pulse signals of normal and hypertension were analyzed by time-frequency method.Experiment results indicate that
the pulse energy is focused on the main wave of frequency below 5 Hz
the pulse energy above 5 Hz is just some part of the whole energy;the frequency range of the ill pulse is wider than the normal
especially in the band of the high frequency part.The time-frequency analysis methods can differentiate the hypertensive pulse signal from the normal very well.