| 摘要 |
<p>A drowsiness detection system (100) constructed according to the invention provides improved performance by preserving, and analyzing newly discovered information contained in rhythmic signal components above 30 Hz which in prior art has universally ignored or discarded as noise. In the first (700), and second (800) embodiments of the invention, one or more analog EEG signals are collected from a subject, appropriately filtered (616), converted into digital form (212), and subjected to frequency analysis. Selected signal components from the frequencies above 30 Hz, which have a high correlation with subject drowsiness, are isolated, and their amplitude, energy, or power contribution to the EEG signal is used to produce a continuous output measure reflecting the subject's alertness or drowsiness (140). The output measure (140) may be compared with a threshold to provide an indication of whether the subject is excessively drowsy.</p> |
