Acoustic Nonlinear Effect on Auricular Cartilage Vibrated with Amplitude-Modulated Ultrasound
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概要
- 論文の詳細を見る
When an ultrasound vibration that has been amplitude-modulated by audible sound is transmitted to an auricular cartilage such as the tragus, an audible sound is heard. To study this phenomenon, we measured the nonlinear effect using a piece of a pig's auricular cartilage and an acceleration sensor, and found that self-demodulation occurred in the cartilage. We also measured the sound pressure level using an acoustic coupler that simulated our earphone placed on the tragus. The results show that audible sound was generated in the coupler's air chamber. However, the most important factor was audible vibration from the cartilage produced by self-demodulation in the cartilage. Therefore, we think that the sound perceived by our earphone is also generated in our auricular cartilage.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2003-05-15
著者
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Okamoto Manabu
Ntt Cyber Space Laboratories Ntt Corporation
-
Watanabe Yoshiaki
Faculty Of Engineering Doshisha University
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Miyoshi Masato
NTT Communication Science Laboratories
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Okamoto Manabu
NTT Cyber Space Laboratories, NTT Corporation, 3-9-11 Midoricho, Musashino-shi, Tokyo 180–8585, Japan
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Watanabe Yoshiaki
Faculty of Engineering, Doshisha University, 1-3 Miyakodani, Tatara, Kyo-Tanabe, Kyoto 610-0321, Japan
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Miyoshi Masato
NTT Communication Science Laboratories, NTT Corporation, 2-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan
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