System and method for detecting sleepiness
US7887489B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2008 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Aug 29, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2503/22
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention relates to a drowsiness detection method. A heartbeat signal and a breathing signal are detected by exploiting together a scheme and an optical system scheme. The detected signals are applied to respective amplification units, noise signals are eliminated from the detected signals, and noise-free signals are amplified. The amplified signals are applied to a central processing unit, signal processing is processed on the signals, and processed signals are combined. The combined signal is counted, and a warning sound, voice message or vibration is output in a case where a value, obtained by subtracting a counted output value monitored one minute before a current time, from a counted output value monitored two minutes before the current time, falls within a detection range and where, with a passage of time, the value falling within the detection range is successively detected from two to ten times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.