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System and method for detecting sleepiness

  • US 7,887,489 B2
  • Filed: 08/29/2008
  • Issued: 02/15/2011
  • Est. Priority Date: 05/22/2008
  • Status: Active Grant
First Claim
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1. A drowsiness detection method, comprising:

  • a first step of detecting a heartbeat signal and a breathing signal without making direct contact with a target body by exploiting together a scheme using a principle of a Doppler radar and an optical system scheme using a light source/photodetector so that a heartbeat can be detected when a human body is moving;

    a second step of applying the signals, detected by the scheme using the principle of the Doppler radar and the optical system scheme using the light source/photodetector to respective amplification units, eliminating noise signals from the detected signals, respectively, and amplifying noise-free signals;

    a third step of applying signals output at the second step to a central processing unit, performing signal processing on the signals, and combining respective processed signals; and

    a fourth step of counting an output value output at the third step, and outputting a warning sound, voice message or vibration through an output unit in a case where a value, obtained by subtracting a counted output value which was monitored one minute before a current time, from a counted output value which was monitored two minutes before the current time, falls within a range from 2 to 10, or from −

    2 to −

    10 and where, with a passage of time, the value falling within the range from 2 to 10 or from −

    2 to −

    10 is successively detected from two to ten times within a same range.

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