DEVICE FOR ESTIMATING STATE OF LIVING ORGANISM
First Claim
1. A biological body state estimation device for estimating a state of a human being by using a biological signal sampled from the upper body of a human by biological signal measuring means and is characterized by having:
- first frequency calculating means for acquiring a zero-crossing point at which a time-series waveform of a biological signal obtained by the biological signal measuring means is changed from positive to negative and for acquiring the time-series waveform of the frequency of the biological signal by using this zero-crossing point;
first frequency slope time-series analysis calculating means for performing movement calculation for acquiring a slope of the frequency at each predetermined time window set with a predetermined overlap time in the time-series waveform of the frequency of the biological signal obtained by the first frequency calculating means and for outputting a time-series change of the slope of the frequency obtained at each time window as a frequency slope time-series waveform;
power spectrum calculating means for applying frequency analysis to the frequency slope time-series waveform obtained by the first frequency slope time-series analysis calculating means and acquiring a power spectrum of each frequency corresponding to a functional adjustment signal, a fatigue reception signal, and an activity adjustment signal determined in advance; and
determining means for determining a state of a human being from a time-series change of the power spectrum of each frequency corresponding to the functional adjustment signal, the fatigue reception signal, and the activity adjustment signal acquired by the power spectrum calculating means.
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Accused Products
Abstract
A technology to grasp a state of a human being more accurately is provided. The technology is provided with means for acquiring a time-series waveform of a frequency from a time-series waveform of a biological signal sampled from the upper body of a human being and for further acquiring a time-series waveform of frequency slope and a time-series waveform of frequency fluctuation and for applying frequency analysis to them. In the frequency analysis, a power spectrum of each frequency corresponding to a functional adjustment signal, a fatigue reception signal, and an activity adjustment signal, respectively, determined in advance is acquired. Then, a state of a human being is determined from a time-series change of each power spectrum. The fatigue reception signal indicates a degree of progress of fatigue in a usual active state and thus, by comparing it with degrees of predominance of the functional adjustment signal and the activity adjustment signal as their distribution rates, a state of a human being (relaxed state, fatigued state, state in which sympathetic nerve is predominant, a state in which parasympathetic nerve is predominant and the like) can be determined more accurately.
29 Citations
20 Claims
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1. A biological body state estimation device for estimating a state of a human being by using a biological signal sampled from the upper body of a human by biological signal measuring means and is characterized by having:
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first frequency calculating means for acquiring a zero-crossing point at which a time-series waveform of a biological signal obtained by the biological signal measuring means is changed from positive to negative and for acquiring the time-series waveform of the frequency of the biological signal by using this zero-crossing point; first frequency slope time-series analysis calculating means for performing movement calculation for acquiring a slope of the frequency at each predetermined time window set with a predetermined overlap time in the time-series waveform of the frequency of the biological signal obtained by the first frequency calculating means and for outputting a time-series change of the slope of the frequency obtained at each time window as a frequency slope time-series waveform; power spectrum calculating means for applying frequency analysis to the frequency slope time-series waveform obtained by the first frequency slope time-series analysis calculating means and acquiring a power spectrum of each frequency corresponding to a functional adjustment signal, a fatigue reception signal, and an activity adjustment signal determined in advance; and determining means for determining a state of a human being from a time-series change of the power spectrum of each frequency corresponding to the functional adjustment signal, the fatigue reception signal, and the activity adjustment signal acquired by the power spectrum calculating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer program incorporated in a biological body state estimation device for estimating a state of a human being by using a biological signal sampled from the upper body of a human being by the biological signal measuring means, comprising:
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a first frequency calculating step of acquiring a zero-crossing point at which a time-series waveform of a biological signal obtained by the biological signal measuring means is changed from positive to negative and of acquiring the time-series waveform of the frequency of the biological signal by using this zero-crossing point; first frequency slope time-series analysis calculating step of performing movement calculation for acquiring a slope of the frequency at each predetermined time window set with a predetermined overlap time in the time-series waveform of the frequency of the biological signal obtained by the first frequency calculating step and of outputting a time-series change of the slope of the frequency obtained at each time window as a frequency slope time-series waveform; power spectrum calculating step of applying frequency analysis to the frequency slope time-series waveform obtained by the first frequency slope time-series analysis calculating step and acquiring a power spectrum of each frequency corresponding to a functional adjustment signal, a fatigue reception signal, and an activity adjustment signal determined in advance; and determining step of determining a state of a human being from a time-series change of the power spectrum of each frequency corresponding to the functional adjustment signal, the fatigue reception signal, and the activity adjustment signal acquired by the power spectrum calculating step. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification