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Effective PPG Signal Processing Method for Detecting Emotional Stimulus
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 Title & Authors
Effective PPG Signal Processing Method for Detecting Emotional Stimulus
Oh, Dong-Gi; Min, Byung-Seok; Kwon, Sung-Oh; Kim, Hyun-Joong;
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 Abstract
In this study, we propose a signal processing algorithm to measure the arousal level of a human subject using a PPG(Photoplethysmography) sensor. From the measured PPG signals, the arousal level is determined by PPI(Pulse to Pulse Interval) and discrete-time signal processing. We ran psychophysical experiments displaying visual stimuli on TV display while measuring PPG signal from a finger, where the nature landscape scenes were used for restorative effect, and the urban environments were used to stimulate the stress. However, the measured PPG signals may include noise due to subject movement and measurement error, which results in incorrect detections. In this paper, to mitigate the noise impact on stimulus detection, we propose a detecting algorithm using digital signal processing methods and statistics of measured signals. A filter is adopted to remove a high frequency noise and adaptively designed taking into account the statistics of the measured PPG signals. Moreover we employ a hysteresis method to reduce the distortion of PPI in decision of emotional. Via experiment, we show that the proposed scheme reduces signal noise and improves stimulus detection.
 Keywords
Emotion;PPG;PPI;Hamming filter;Hysteresis;
 Language
Korean
 Cited by
1.
동잡음에 강건한 PPG 신호 측정 방안,김민호;김태욱;장성환;반다희;민병석;권성오;

한국통신학회논문지, 2013. vol.38C. 12, pp.1085-1094 crossref(new window)
1.
Evaluation of PPG signals regarding to video attributes of smart-phone camera, Journal of the Korea Institute of Information and Communication Engineering, 2015, 19, 4, 917  crossref(new windwow)
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