| Title |
Reconstruction of the Undersampled Photoplethysmogram with Various Interpolation Methods |
| Authors |
신항식(Shin, Hangsik) ; 김훈(Kim, Hoon) |
| DOI |
https://doi.org/10.5370/KIEE.2016.65.8.1418 |
| Keywords |
Interpolation ; Photoplethysmography ; Power management ; U-Healthcare ; Undersampling |
| Abstract |
The purpose of this research is to investigate the effect of sampling frequency on the photoplethysmography (PPG) and to evaluate the performance of interpolation methods for under-sampled PPG. We generated down-sampled PPG using 10 kHz-sampled PPG then evaluated waveshape changes with correlation coefficient. Correlation coefficient was significantly decreased at 50 Hz or below sampling frequency. We interpolated the down-sampled PPG using four interpolation method-linear, nearest, cubic spline and piecewise cubic Hermitt interpolation polynomial - then evaluated interpolation performance. As a result, it was shown that PPG waveform that was sampled over 20 Hz could be reconstructed by interpolation. Among interpolation methods, cubic spline interpolation showed the highest performance. However, every interpolation method has no or less effect on 5 Hz sampled PPG. |