Figure 1
PPG, the first derivative of PPG (VPG), the second derivative of PPG (APG) signal and their features. The abbreviations T and Y denote the time (ms) and amplitude of the corresponding points, respectively.
Figure 1 | Scientific Reports
PPG, the first derivative of PPG (VPG), the second derivative of PPG (APG) signal and their features. The abbreviations T and Y denote the time (ms) and amplitude of the corresponding points, respectively.
