PROBLEM TO BE SOLVED: To detect an apneic state in time of sleep with high accuracy.SOLUTION: This apneic state decision device includes: a section detection part detecting, from an acoustic signal, a respiration section regarded that the section includes respiratory sound, and a halfway section present between the respiration sections a calculation part calculating an acoustic characteristic amount based on a background noise component included in the halfway section and a signal component except the background noise component and a decision part deciding the halfway section as an apneic state when the acoustic characteristic amount agrees with a prescribed condition. The acoustic characteristic amount based on the background noise component and the signal component except the background noise component is, for example, a signal to noise ratio of the acoustic signal in the halfway section, or a spectrum distance with the past acoustic signal.COPYRIGHT: (C)2014,JPO&INPIT【課題】精度良く無呼吸状態を検出する。【解決手段】無呼吸状態判定装置は、睡眠中の音響信号から、呼吸音を含むとみなされる呼吸区間と、呼吸区間の間に存在する中途区間とを検出する区間検出部と、中途区間に含まれる背景雑音成分と背景雑音成分以外の信号成分に基づく音響特徴量を算出する算出部と、音響特徴量が所定条件に合致する場合に、中途区間を無呼吸状態と判定する判定部と、を備える。背景雑音成分と背景雑音成分以外の信号成分に基づく音響特徴量は、例えば、中途区間における音響信号の信号対雑音比や、過去の音響信号とのスペクトル距離である。【選択図】図2
