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. 2022 Sep 17;22(18):7047. doi: 10.3390/s22187047

Figure 4.

Figure 4

Example of PPG signal filtering: (a) Raw PPG signal obtained from the Samsung device, (b) Signal filtered with the IDWT, (c) Results of amplitude modulation removal, (d) Example of detected peaks (red asterisks) with the AMPD algorithm. The Arm experiment, person P6.