Micro Physiological Vibration Detection for Human Heartbeats
The purpose of this investigation is to verify the accuracy and stability of a novel detection scheme based on pulsation micro-vibration signals. Different from traditional heart rate measurement, this scheme has the advantage of convenience in comparison with the pulsations determined by EKG and PPG. Actually, the heartbeat pulsation measurement based on EKG is usually served as the ground true. However, the pulsation measurement based on PPG was popularly fulfilled on many wearable devices such as rings or watches. To assure the measuring effectiveness of heartbeat pulsations, the scheme is compared to the pulsation measurement based on EKG and PPG. After several experiments and signal processing steps, the statistics of correlation coefficients based on the Pearson correlation coefficient were obtained, and the correlation coefficients among the signals due to EKG, PPG, and micro-vibration are as high as 0.98. Since modern smart phones have the same inertial sensors, which are used in this investigation to detect the micro-vibration signals from heartbeats, it is very promising to realize an APP of smart phones to detect heartbeats more conveniently.
KeywordsPhysiological vibration Heartbeat EKG PPG
This work was financially supported by the “Intelligent Recognition Industry Service Center” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan.
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