Figure 7
From: Assessment of pulse rate variability by the method of pulse frequency demodulation
Frequency characteristics of PFDM. Simulated pulse wave signal was generated by a source interval function oscillating at linearly increasing frequency form 0 to 0.5 Hz at 0.001 Hz/sec (panel A). Panel B: demodulated pulse interval obtained from the simulated pulse wave with the PFDM. Panel C: transfer magnitude (solid line) and transfer phase (dashed line) calculated between the source interval and the demodulated pulse interval with the PFDM. Insets indicate the frequency ranges corresponding low frequency (LF) and high frequency (HF) bands.