The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Reconstruction of the Undersampled Photoplethysmogram with Various Interpolation Methods

보간 방법에 따른 언더샘플링된 광용적맥파 복원 가능성 평가

  • Shin, Hangsik (Department of Biomedical Engineering, Chonnam National University) ;
  • Kim, Hoon (School of Mechanical Design Engineering, Chonnam National University)
  • Received : 2016.06.20
  • Accepted : 2016.07.11
  • Published : 2016.08.01
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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.

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References

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