The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2011
Filed:
May. 29, 2009
Applicant:
Ayu Karasudani, Kawasaki, JP;
Inventor:
Ayu Karasudani, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B 5/04 (2006.01);
U.S. Cl.
CPC ...
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.