| 摘要 |
A driver's arousal level estimating apparatus for a vehicle includes a FFT signal processing section for obtaining respective frequency component powers by applying a frequency conversion to displacement quantities successively detected of the vehicle, an evaluation value calculating section for calculating an evaluation value from a ratio of an average value of the respective calculated frequency powers and a maximum value of frequency component powers in a specified frequency domain containing a predetermined lateral fluctuation frequency characteristic of a lowered arousal level, and a judging section for judging a driver's arousal level based on said evaluation value.
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