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Sleepiness level detection device

  • US 7,206,631 B2
  • Filed: 05/25/2004
  • Issued: 04/17/2007
  • Est. Priority Date: 05/27/2003
  • Status: Expired due to Fees
First Claim
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1. A sleepiness level detection device comprising:

  • means for detecting a heartbeat signal of a test subject;

    calculation means for performing frequency analysis on the heartbeat signal and calculating a spectrum signal that indicates the distribution of frequency components included in the heartbeat signal; and

    evaluation means for settling a band having a lower frequency than a conscious-state peak frequency as a sleepiness level index band for indicating a sleepiness level, in the spectrum signal, with respect to the conscious-state peak frequency in a conscious state of the test subject, and evaluating the sleepiness level of the test subject, on basis of strength of the spectrum signal in the sleepiness level index band;

    whereinthe evaluation means evaluates the sleepiness level of the test subject when the test subject operates predetermined equipment, and the peak frequency of the spectrum signal, at a time after a predetermined time has elapsed since the fully awake test subject began operating the predetermined equipment, is set as the conscious-state peak frequency.

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