Sleepiness level detection device

Details Sleepiness level detection device Sleepiness level detection device

2007-04-17

2007-04-17

Layno, Carl (Department: 3766)

Surgery

Diagnostic testing

Cardiovascular

C600S509000

Reexamination Certificate

active

10852955

ABSTRACT:
A sleepiness level detection device detects a heartbeat signal when a time equal to or longer than T1and equal to or shorter than T2has elapsed since the start of driving. The heartbeat signal is subjected to FFT processing to obtain a spectrum signal. By use of a peak frequency of the spectrum signal, a driver conscious-state peak frequency is estimated. A consciousness level index band α is set with respect to the conscious-state peak frequency. A sleepiness level index band β is set with respect to a frequency, which is calculated by multiplying the conscious-state peak frequency by a predetermined ratio (65 to 90%). A sleepiness level evaluation parameter Sp (=βp/(αp+βp)) for indicating the sleepiness level of the driver is calculated with the use of the strength αp and βp of spectrum signals.

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Examination Report from corresponding CN patent application No. 200410044788.2 issued Sep. 15, 2006.

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