| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
It was previously discovered that the sound pressure level (SPL) and repetitive component of sound generated by a music box increased when applying pressure near the music box using a thin acrylic board. Applying this phenomenon, it is possible to increase the SPL and intelligibility of sound without increasing the amount of electric power used. The present study used four types of boards and three types of sound sources (i.e., a music box, loudspeaker, and mobile phone) to reproduce and clarify increases in the SPL and repetitive component due to pressurization near the sound source in more detail. It was found that a 0.5-mm-thick acrylic or plastic board produced the highest SPL and most repetitive component. The phenomenon could not be reproduced well for the loudspeaker or mobile phone. By incorporating a mechanism that generates this phenomenon inside a loudspeaker, it is possible to increase the SPL and intelligibility of existing loudspeakers and mobile phones.
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