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. 2021 Feb 10;26(2):022707. doi: 10.1117/1.JBO.26.2.022707

Fig. 15.

Fig. 15

Change in adaptive filter bandwidth for different scenarios: the range of motion increases from still task to talking. With an increase of motion, the motion interference component in the iPPG signal increases and the bandwidth of the bandpass filter is the largest for the still task and smallest for talking task.