Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
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Design of Filter to Reject Motion Artifacts of PPG Signal Using Multiwave Optical Source

다파장 광원을 이용한 광용적 맥파의 동잡음 제거 필터 설계

  • Park, Heejung (Dept. of Medical Engineering, Andong Science College) ;
  • Nam, Jaehyun (Dept. of Nursing, Andong Science College) ;
  • Lee, Juwon (Dept. of Medical Engineering, Andong Science College)
  • 박희정 (안동과학대학교 의료공학과) ;
  • 남재현 (안동과학대학교 간호학과) ;
  • 이주원 (안동과학대학교 의료공학과)
  • Received : 2014.01.16
  • Accepted : 2014.02.03
  • Published : 2014.02.28
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Abstract

This study is proposed the novel PPG sensor device and the signal processing method to replace the acceleration sensor that is used to reject motion artifacts contained in photoplethysmography(PPG). The proposed method is to reject motion artifacts by an adaptive filter based on the estimated motion artifact by using a blue LED light. To evaluate the performance of the proposed method experimentally, We did design a novel sensor consisted of blue/red LEDs and photo-sensor and implemented, and then rejected the motion artifacts by using an adaptive filter and the implemented sensor. In the results of the experiments, it is shown that the proposed sensor device and signal processing can reconstruct the PPG signal despite the occurrence of motion artifacts, and also that the SNR was 4.5 times of moving average filter. According to the experimental results, the proposed method can be applied to design a low-cost device.

본 연구에서는 PPG 신호에 포함되어 있는 동잡음을 제거하기위해 사용되는 가속도 센서를 대체하기 위한 새로운 PPG 센서와 그 신호처리 기법을 제안하며, 제안된 방법은 청색광으로부터 추정된 동잡음을 기반으로 하여 광용적 맥파의 동잡음을 제거하는 것이다. 제안된 방법의 성능을 평가하기위해 청색광 LED와 적색광 LED, 포토센서를 이용하여 센서 프로브 설계하고 제작하였고, 제작된 센서 프로브와 적응필터를 이용하여 동잡음 제거 처리를 하였다. 실험의 결과에서는 제안된 센서와 신호처리 방법이 동잡음이 발생하더라도 신호 복원이 잘되었으며, 신호 대잡음비도 기존의 이동평균필터 보다 4.5배 이상 향상되었다. 이 실험의 결과로부터 제안된 방법이 저가의 헬스케어 단말기 설계에 적용될 수 있을 것이다.

Keywords

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