VEHICLE PRESENCE NOTIFICATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a vehicle presence notification apparatus that makes the false engine sound similar to a real engine sound by controlling the directivity of the false engine sound without increasing the number of speakers.

SOLUTION: A control circuit 2 of a vehicle presence notification apparatus increases the ratio of the high-pitched frequency component to the low-pitched frequency component in the false engine sound as the speed of the vehicle is raised. The directivity of false engine sound generated on the front side of a vehicle can be narrowed according to an increase in vehicle speed, and the false engine sound can be made realistic. A rate of a frequency component of false engine sound is changed to control the directivity. Because many speakers are not necessary, the cost can be reduced and it becomes easy to mount the vehicle presence notification apparatus which can control the directivity of the false engine sound.

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