| 摘要 |
<p>PURPOSE: To detect accurately the dozing state of a driver or the like by recalculating a threshold at every fixed time or every fixed pulse number, in the case of a device which integrates a RRI value that surpasses the average value out of the RRI values of a predetermined pulse number amount or a predetermined time and issues warning when an integrated value surpasses the threshold. CONSTITUTION: A control unit 1 is attached on the surface of an arm band, and at the same time a heart pulse sensor 2 and a warning piece 3 are affixed on the back of the arm band, and at the time of a power source switch 5 having been mode ON, a power source portion 4 is started, and the output signal of the heart pulse sensor 2 is inputted into an operation circuit 6. The operation circuit 6 seeks as thresholds the average value of the whole of the RRI values (intervals between R waves and R waves in an electrocardiogram) of a predetermined pulse number amount detected at the time of waking up, and the predetermined magnification of the integrated value of a RRI value that surpasses the average value, and out of the RRI values of a predetermined number after that, a RRI value that surpasses the average value is integrated, and when a threhold is surpassed, the warning piece 3 is driven, and its threshold is recalculated at ever fixed time or every fixed pulse number.</p> |
