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Sensors 2017, 17(4), 860; doi:10.3390/s17040860

Blockwise PPG Enhancement Based on Time-Variant Zero-Phase Harmonic Notch Filtering

1
School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea
2
Emotion Recognition IoT Research Section, Hyper-connected Communication Research Laboratory, Electronic and Telecommunications Research Institute (ETRI), Daejeon 34129, Korea
3
Department of Biomedical Science and Engineering (BMSE), Institute of Integrated Technology (IIT), Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea
*
Author to whom correspondence should be addressed.
Academic Editors: Edward Sazonov and Subhas Chandra Mukhopadhyay
Received: 23 January 2017 / Revised: 3 April 2017 / Accepted: 11 April 2017 / Published: 14 April 2017
(This article belongs to the Special Issue Wearable and Ambient Sensors for Healthcare and Wellness Applications)
View Full-Text   |   Download PDF [4257 KB, uploaded 14 April 2017]   |  

Abstract

So far, many approaches have been developed for motion artifact (MA) reduction from photoplethysmogram (PPG). Specifically, single-input MA reduction methods are useful to apply wearable and mobile healthcare systems because of their low hardware costs and simplicity. However, most of them are insufficiently developed to be used in real-world situations, and they suffer from a phase distortion problem. In this study, we propose a novel single-input MA reduction algorithm based on time-variant forward-backward harmonic notch filtering. To verify the proposed method, we collected real PPG data corrupted by MA and compared it with existing single-input MA reduction methods. In conclusion, the proposed zero-phase line enhancer (ZLE) was found to be superior for MA reduction and exhibited zero phase response. View Full-Text
Keywords: photoplethysmogram; motion artifact; single-input; forward-backward filtering; linear time-variant photoplethysmogram; motion artifact; single-input; forward-backward filtering; linear time-variant
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Park, C.; Shin, H.; Lee, B. Blockwise PPG Enhancement Based on Time-Variant Zero-Phase Harmonic Notch Filtering. Sensors 2017, 17, 860.

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