Table 5 Summary of PPG signal features essential for biomarkers as well as other health sensing applications.
Applications | AC Component | DC Component | Time domain signal features | Frequency domain signal features | First order derivative features | Second order derivative features |
|---|---|---|---|---|---|---|
✓ | ✓ | ✓ | ✓ | ✓ | ✓ | |
✓ | ✗ | ✓ | ✗ | ✗ | ✗ | |
✓ | ✗ | ✗ | ✓ | ✗ | ✗ | |
✓ | ✗ | ✓ | ✗ | ✗ | ✗ | |
✗ | ✗ | ✓ | ✓ | ✓ | ✓ | |
✗ | ✗ | ✓ | ✓ | ✓ | ✓ | |
Energy expenditure62 | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
✗ | ✓ | ✗ | ✗ | ✗ | ✗ |
