PROBLEM TO BE SOLVED: To provide a technique for further accurately acquiring the state of a person.SOLUTION: A frequency time-series waveform is acquired from a time-series waveform of biological signal, and a time-series waveform of frequency slope is further acquired. The time-series waveform of frequency slope is subjected to frequency analysis so as to acquire the number of break points that show a bifurcation phenomenon in each regression line on the basis of difference in the values of power spectral densities and difference in slopes of the regression lines, and a shape score based on the number of break points is acquired. A determination reference point is acquired using at least one of a regional score and the shape score of each regression line, and the state of a person is determined on the basis of the time-series change of the determination reference points. By acquiring scores, this configuration enables to determine the state of a person accurately and objectively.COPYRIGHT: (C)2013,JPO&INPIT【課題】 人の状態をより正確に把握する技術を提供する。【解決手段】 生体信号の時系列波形から周波数の時系列波形を求め、さらに、周波数傾きの時系列波形を求める。この傾き時系列波形を周波数解析し、パワースペクトル密度の値の較差及び回帰直線間の傾きの違いに基づき、各回帰直線全体における分岐現象を示す折れ点数を求め、その折れ点数に基づいた形状得点を付与し、回帰直線毎の領域得点及び形状得点の少なくとも一方を用いて、判定基準点を求め、その時系列変化から人の状態を判定する。得点を求める構成であるため、客観的にかつ正確に状態判定を行うことができる。【選択図】 図4
