PROBLEM TO BE SOLVED: To provide a heart rate detection method for correctly extracting an acceleration pulse wave signal from a volume pulse wave signal without amplifying only noise components by second order differential processing to obtain the variation amount of a pulse wave signal nor submerging thereby the original pulse wave signal in noise.SOLUTION: The heart rate detection method for detecting the heart rate by intensity of a light transmitting through or reflecting from a living body includes: a first process of converting the transmitted or reflected light into an electric signal, and subjecting the electric signal to a low frequency transmission filtering a second process of subjecting the signal after passing through the first process to differential processing a third process of subjecting the signal after passing through the second process to the low frequency transmission filtering a fourth process of subjecting the signal after passing through the third process to the differential processing a fifth process of subjecting the signal after passing through the fourth process to the low frequency transmission filtering and a sixth process of detecting the peak value from the signal after passing through the fifth process, and assuming the interval of the peak value as a heartbeat interval.COPYRIGHT: (C)2013,JPO&INPIT【課題】脈波信号の変化量を求めるための2階微分処理によりノイズ成分だけを増幅させること、及びこれにより本来の脈波信号がノイズに埋もれることがないように容積脈波信号から加速度脈波信号を正しく抽出する心拍検知方法を提供する。【解決手段】心拍検知方法は、生体を透過あるいは反射する光の強弱により心拍を検知する心拍検知方法であって、透過あるいは反射した光を電気信号に変換し、電気信号に低周波透過フィルタを施す第1の工程と、第1の工程を通過後の信号に微分処理を施す第2の工程と、第2の工程を通過後の信号に低周波透過フィルタを施す第3の工程と、第3の工程を通過後の信号に微分処理を施す第4の工程と、第4の工程を通過後の信号に低周波透過フィルタを施す第5の工程と、第5の工程を通過後の信号からピーク値を検出し、ピーク値の間隔を心拍間隔とする第6の工程とを備える。【選択図】図1
