Comparison and Noise Suppression of the Transmitted and Reflected Photoplethysmography Signals

Figure 2

PPG signals: (a) the transmittance-mode in sitting calmly, (b) the reflectance-mode in sitting calmly, (c) the transmittance-mode in moving slightly, and (d) the reflectance-mode in moving slightly.

(a)

(b)

(c)

(d)