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| Presentation | 2014-08-25 15:45 Measurement of directivity and source level variation for sound produced by snapping shrimp gathered in Hashirimizu Port at Yokosuka Kazuyoshi Mori, Hanako Ogasawara, Toshiaki Nakamura (NDA)  US2014-39 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | It is important to survey biological transient noises produced by snapping shrimp, which may be the main noise sources in ambient noise imaging (ANI) applications in coastal waters. The authors had gathered some samples of snapping shrimps in Hashirimizu Port at Yokosuka, and had measured those sounds in a laboratory conditions, previously. Then, the variation of the source level, which is the difference between maximum and minimum, had attained about 20 dB when the samples were walking around in the small cage. If the sound produced by snapping shrimp has directivity, the source level may be varied by the direction of the sample. In this study, we measured the directivities of sound produced by 8 samples of snapping shrimps gathered in 2012. Here, the directions of samples were fixed. The directivities were measured by multiple hydrophones placed around the samples. There was no remarkable directivity in the measurement results, because the variations in the directivity patterns were about 7 dB at most. Here, the variation of source level at individual sample was about 22 dB at most. Thus, it was supposed that the strength and weakness of the sound produced by each sample originated the variation of source level, but the directivity did not. Additionally, we measured the relationships between the waveforms and the source levels produced by 14 samples gathered in 2013. When the source level was weak, the main pulse, which is a part of specific waveform produced by snapping shrimp, was missing. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Ocean Ambient Noise / Biological Noise / Snapping Shrimp / Directivity / Source Level / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 114, no. 190, US2014-39, pp. 35-38, Aug. 2014. | |
| Paper # | US2014-39 | |
| Date of Issue | 2014-08-18 (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 | US2014-39 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2014-08-25 - 2014-08-25 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Institute of Technology, Ookayama Campus |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Underwater Acoustics, General(Co-Organization：The Marine Acoustics Society of Japan) |
| Paper Information | |
| Registration To | US |
| Conference Code | 2014-08-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Measurement of directivity and source level variation for sound produced by snapping shrimp gathered in Hashirimizu Port at Yokosuka |
| Sub Title (in English) | |
| Keyword(1) | Ocean Ambient Noise |
| Keyword(2) | Biological Noise |
| Keyword(3) | Snapping Shrimp |
| Keyword(4) | Directivity |
| Keyword(5) | Source Level |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Kazuyoshi Mori |
| 1st Author's Affiliation | National Defense Academy (NDA) |
| 2nd Author's Name | Hanako Ogasawara |
| 2nd Author's Affiliation | National Defense Academy (NDA) |
| 3rd Author's Name | Toshiaki Nakamura |
| 3rd Author's Affiliation | National Defense Academy (NDA) |
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| Speaker | Author-1 |
| Date Time | 2014-08-25 15:45:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2014-39 |
| Volume (vol) | vol.114 |
| Number (no) | no.190 |
| Page | pp.35-38 |
| #Pages | 4 |
| Date of Issue | 2014-08-18 (US) |
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