Sleepiness level detection method and apparatus

Details Sleepiness level detection method and apparatus Sleepiness level detection method and apparatus

2011-06-28

2011-06-28

Layno, Carl H. (Department: 3766)

Surgery

Diagnostic testing

Cardiovascular

C600S502000, C600S301000, C600S595000

Reexamination Certificate

active

07970459

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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International Search Report of International Application No. PCT/JP2006/323855.
Extended European Search Report for corresponding European Application 06833658.5; dated Dec. 4, 2009.

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