US Patent 7970459 Sleepiness level detection method and apparatus
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Patent abstract
A sleepiness level detection method of determining a sleepiness level of a subject, includes: detecting a heart beat signal indicating a signal of heart beats from the subject and storing the heart beat signal in a storage device; detecting amplitude peaks of the heart beat signal and detecting an interval between the amplitude peaks as a heart beat interval; and computing a spectral density corresponding to fluctuation in the heart beat interval detected and determining the sleepiness level based on a maximum frequency at which the spectral density is maximum.
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Patent Inventor Names
Ayu Karasudani0
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US Patent 07970459 Sleepiness level detection method and apparatus US Patent 7970459 Sleepiness level detection method and apparatus
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Patent Number
07970459
Patent Number
7970459
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US Patent 07970459 Sleepiness level detection method and apparatus
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Patent jurisdiction
Patent number
07970459
Date of patent
June 28, 2011
Patent application number
12457055
Date Filed
May 29, 2009
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