Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ayu Karasudani0
Date of Patent
June 28, 2011
Patent Application Number
12457055
Date Filed
May 29, 2009
Patent Primary Examiner
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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