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박찬오(Chan-O Park),신우식(Woo-Sik Shin),지용환(Yong-Hwan Ji),조정현(Jung Hyun Cho),윤길원(Gilwon Yoon) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
PPG signal can have significant DC drift due to motion artifact and small AC amplitudes caused by low perfusion. We controlled DC drift by adjusting the signal ground level and AC amplitude by varying LED light intensity. Using a microprocessor-based system, PPG levels could be successfully controlled in a 3V single power supply system.
허영정(Young-Jung Huh),조정현(Jung-Hyun Cho),신우식(Woo-Sik Sin),지용환(Yong-Hwan Ji),윤길원(Gilwon Yoon) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Respiration rates can be computed from photo-plethysmography(PPG). Motion artifact and the influence of other physiological parameters make accurate measurement difficult, however. Methods of improving the accuracy were presented PPG measurement on the pit of stomach produced better results compared with that on a finger which is the normal site for PPG measurement, Further improvement was made by choosing bandpass filtering with a sharper roll-off rate such as the Chebyshev.