Figure 1
From: Assessment of pulse rate variability by the method of pulse frequency demodulation
Method for generating simulated pulse wave signal. Simulated pulse wave (panel B) was generated as a sequence of a unit pulse wave. The pulse interval was modulated by source interval functions (panel A). The width of each unit pulse wave was also modulated as 18.97 × (PI)1/2 ms, where PI is the pulse interval. a.u. = arbitrary unit.