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| Presentation | 2010-04-22 13:20 Driving for Reducing Carrier Ultrasound of Parametric Loudspeaker Yoshiyuki Hara, Yoshu Maekawa, Hideyuki Nomura, Tomoo Kamakura (UEC)  US2010-1 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | A parametric loudspeaker using the self-demodulation of a finite-amplitude ultrasonic wave by the nonlinearity of the air is promising for improving sound environments. However, ultrasound exposure to human beings has to be pay attention because intense ultrasounds are radiated from driving parametric loudspeakers. As a solution of such problem a ultrasound source consisted of two coaxially arranged planar projector was proposed. Both the projectors are driven individually at the same frequencies but different phase angles. Generally, when the phases are out of phase, ultrasonic sound pressure amplitudes are reduced by around 10dB without deteriorating the acoustic features of parametric sounds. In this study, configurations of the projectors are discussed to further reduced ultrasound. Some numerical examples demonstrate that the ultrasonic pressure is reduced by 10 dB while keeping the reduction of only 3 dB for parametric sounds. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Parametric loudspeaker / Phase inversion driving / Ultrasound / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 110, no. 10, US2010-1, pp. 1-4, April 2010. | |
| Paper # | US2010-1 | |
| Date of Issue | 2010-04-15 (US) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | US2010-1 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2010-04-22 - 2010-04-22 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | The University of Electro-Communications |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Nonlinear Acoustics, General, etc |
| Paper Information | |
| Registration To | US |
| Conference Code | 2010-04-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Driving for Reducing Carrier Ultrasound of Parametric Loudspeaker |
| Sub Title (in English) | |
| Keyword(1) | Parametric loudspeaker |
| Keyword(2) | Phase inversion driving |
| Keyword(3) | Ultrasound |
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| 1st Author's Name | Yoshiyuki Hara |
| 1st Author's Affiliation | The University of Electro-Communications (UEC) |
| 2nd Author's Name | Yoshu Maekawa |
| 2nd Author's Affiliation | The University of Electro-Communications (UEC) |
| 3rd Author's Name | Hideyuki Nomura |
| 3rd Author's Affiliation | The University of Electro-Communications (UEC) |
| 4th Author's Name | Tomoo Kamakura |
| 4th Author's Affiliation | The University of Electro-Communications (UEC) |
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| Speaker | Author-1 |
| Date Time | 2010-04-22 13:20:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2010-1 |
| Volume (vol) | vol.110 |
| Number (no) | no.10 |
| Page | pp.1-4 |
| #Pages | 4 |
| Date of Issue | 2010-04-15 (US) |
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