PROBLEM TO BE SOLVED: To provide a pulse wave detector capable of performing pulse wave noise determination that is hardly affected by biological information such as a blood pressure value and vascular age.SOLUTION: A pulse wave detector includes a processing unit for: acquiring a pulse wave detected by a pulse wave sensor to calculate an acceleration pulse wave 4 from the pulse wave extracting a first to fifth inflection points a to e on the basis of an acceleration pulse wave 4s rising start point 5, as feature amounts of the acceleration pulse wave 4 calculating area S of pulse wave part 6 after the fifth inflection point e of the acceleration pulse wave 4s part corresponding to one beat and determining that the pulse wave is valid when the area S is equal to or smaller than a threshold and determining that the pulse wave is invalid when the area S exceeds the threshold. The processing unit may calculate an amplitude value H of the first inflection point a and determine that the pulse wave is valid when a value SNR (=H/S) obtained by normalizing the area S by using the amplitude value H is equal to or larger than a threshold and determine that the pulse wave is invalid when the value SNR is smaller than the threshold. Since a feature amount reflecting biological information hardly emerges in the pulse wave part 6, accurate noise determination is possible regardless of the biological information.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2016,JPO&INPIT【課題】血圧値、血管年齢等の生体情報の影響を受けにくい脈波のノイズ判定を行うことができる脈波検出装置を提供する。【解決手段】脈波検出装置の処理ユニットは、脈波センサが検知した脈波を取得し、その脈波から加速度脈波4を求める。加速度脈波4の特徴量として、加速度脈波4の立ち上がり開始点5を基準に1番目から5番目までの変曲点a~eを抽出する。一拍分の加速度脈波4のうち、第5変曲点e以降の脈波部分6の面積Sを算出する。面積Sが閾値以下の場合には、有効な脈波と判定し、閾値を超えた場合には脈波は無効と判定する。第1変曲点aの振幅値Hを算出し、その振幅値Hで面積Sを規格化した値SNR(=H/S)が閾値以上の場合に有効な脈波と判定し、閾値未満の場合に脈波は無効と判定しても良い。脈波部分6は、生体情報を反映した特徴量があらわれにくい部分であるので、生体情報にかかわらず高精度なノイズ判定を行うことができる。【選択図】図4
