| 摘要 |
In order to provide a warning to the driver depending on the driver's state, an acoustic standing wave is generated. The head of the driver is positioned in said standing wave in such a way that, in a nominal position of the head, the ears (5) of the driver are situated at nodal points of the standing wave, and in the event of any deviation from said nominal position, an acoustic warning signal can be perceived by the driver.
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