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Fig. 2 | BioMedical Engineering OnLine

Fig. 2

From: A new approach for analysis of heart rate variability and QT variability in long-term ECG recording

Fig. 2

The simulated signal. The signal, shown on the right bottom subplot, is composed of two oscillatory components s1(t) and s2(t), and the noise ξ(t), shown on the left column. The time-varying amplitudes are superimposed on the left top and left middle subplots in black, and the time-varying frequencies are plotted on the right top subplot. It is clear that the amplitude and frequency are time-varying, and each component exists only for a finite period. The noise is spiky due to the fat-tail property of the considered noise

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