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System for discriminating sleep state

  • US 5,101,831 A
  • Filed: 07/12/1991
  • Issued: 04/07/1992
  • Est. Priority Date: 07/07/1989
  • Status: Expired due to Term
First Claim
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1. A system for discriminating a sleep state of and selectively waking a subject, the system comprising means for setting a measuring time, means for measuring, as a biological signal of the subject, at least one biological signal per unit time selected from the group consisting of pulse rate and respiration rate, a variation index computing means for providing variation indexes C(t) representing variation of the biological signal H(t) in the form of a linear combination of first variation amount I(t) denoting a tendency of increment in time series of said biological signal H(t) from a starting time of the measuring to a time when the biological signal is obtained with second variation amount D(t) denoting a standard variation of the biological signal H(t) during said measuring time, and a sleep index operating means for providing sleep indexes allowing a NREM sleep state and all other sleep states to be discriminated from one another on the basis of said variation indexes C(t) continuously exceeding a predetermined threshold C(th).

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