| 摘要 |
PROBLEM TO BE SOLVED: To form a simple and compact structure, and stably increase the volume of engine sounds in a low frequency band. SOLUTION: A loudspeaker 15 capable of reproducing engine sounds is installed to a door body 10 constituting an automobile, and a plurality of tubular elements 16 are installed inside the door body 10. After sounds generated from an engine E are converted into electric signals by a microphone device 19, they are processed by a control unit 18 in a predetermined manner, so as to reproduce the engine sounds. Respective tubular elements 16 are installed at positions adjacent to the loudspeaker 15, and resonated by reproduction sounds of the loudspeaker 15, so as to increase the volume of the reproduction sounds in a low frequency band. COPYRIGHT: (C)2007,JPO&INPIT
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