PROBLEM TO BE SOLVED: To provide a pulse rate measuring method which has robustness to a body movement and can follow a pulse change and a blood oxygen saturation measuring method.SOLUTION: The pulse rate measuring method includes: a time width measuring process for measuring a time width between peaks or bottoms of a wave form of a light receiving signal by a light receiving element which receives light passing thorough or reflected on a biological tissue to calculate a pulse estimated value in accordance with the time width a spectral distribution calculating process for calculating a spectral distribution by analyzing a frequency of the light receiving signal to calculate the pulse estimated value in accordance with the spectral distribution and a pulse rate calculating process for calculating a pulse rate in accordance with a weighted mean of the pulse estimated value of present time and the pulse estimated value up to previous time respectively in the time width measuring process and the spectral distribution calculating process. The time width measuring process, the spectral distribution calculating process and the pulse rate calculating process are carried out one after another to obtain the pulse estimated value and the pulse rate in time series.COPYRIGHT: (C)2012,JPO&INPIT【課題】体動に対して頑健性を有し脈拍変化にも追随可能な脈拍数測定方法及び血中酸素飽和度測定方法を提供する。【解決手段】生体の組織を透過又は反射した光を受光した受光素子による受光信号の波形のピーク間もしくはボトム間の時間幅を測定し、時間幅に基づいて脈拍推定値を算出する時間幅測定工程と、受光信号の周波数解析によってスペクトル分布を計算し、スペクトル分布に基づいて脈拍推定値を算出するスペクトル分布計算工程と、時間幅測定工程及びスペクトル分布計算工程のそれぞれにおける、現時刻の脈拍推定値と前時刻までの脈拍推定値との重み付き平均により脈拍数を算出する脈拍数算出工程と、を有し、時間幅測定工程、スペクトル分布計算手段、及び脈拍数算出工程を逐次実行することにより、時系列の脈拍推定値及び脈拍数を得る。【選択図】図1
