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| Presentation | 2011-10-29 11:15 Development of an Earplug Type Low-frequency Microphone System and its Application Masato Yamashita, Sho Arai, Kenji Furihata (Shinshu Univ.)  EA2011-80 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This paper investigated whether intracranial pressure (ICP) can be assessed by measuring infrasonic emissions from the tympanic membrane for human. It is thought that ICP can be assessed on the basis of infrasonic emissions because tympanic membrane displacement is a result of the transmission of ICP waves via the cochlear duct to the inner ear and then via the oval window to the auditory ossicles of the middle ear. For human, the relationship between the waveform of infrasonic emissions from the tympanic membrane (an earplug type low-frequency microphone system developed) and the wave form of the carotid artery (a stethoscope with low-frequency microphone developed) can be quantitatively characterized using a newly developed technique in systems analysis, the time-varying transfer function. This technique considers the sound pressure of the carotid artery as an input composed of multiple frequencies represented in the output infrasonic emissions from the tympanic membrane according to the transfer function imposed by the intracranial system on the input signal. The transfer function obtained from 8 normal subjects can change with time and with postural change. The results suggest that (a) the transfer function calculated from the output-error model (oe443) of the system identification toolbox (MathWorks MATLAB) is best fits (about 50%), and (b) a pulsation absorption mechanism appears as a notch filter under postural change. Therefore, it can be said that a noninvasive intracranial pressure measurement using infrasonic emissions from the tympanic membrane and the carotid artery is effective. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Earplug Type Microphone / Pulse Wave in the Ear Canal / Carotid Pulse Wave / Transfer Function / Linear Predictive Model / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 111, no. 270, EA2011-80, pp. 73-78, Oct. 2011. | |
| Paper # | EA2011-80 | |
| Date of Issue | 2011-10-21 (EA) | |
| 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 | EA2011-80 |
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| Conference Information | |
| Committee | EA |
| Conference Date | 2011-10-28 - 2011-10-29 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Faculty of Engineering, Shinshu Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | General Topics |
| Paper Information | |
| Registration To | EA |
| Conference Code | 2011-10-EA |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Development of an Earplug Type Low-frequency Microphone System and its Application |
| Sub Title (in English) | |
| Keyword(1) | Earplug Type Microphone |
| Keyword(2) | Pulse Wave in the Ear Canal |
| Keyword(3) | Carotid Pulse Wave |
| Keyword(4) | Transfer Function |
| Keyword(5) | Linear Predictive Model |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Masato Yamashita |
| 1st Author's Affiliation | Shinshu University (Shinshu Univ.) |
| 2nd Author's Name | Sho Arai |
| 2nd Author's Affiliation | Shinshu University (Shinshu Univ.) |
| 3rd Author's Name | Kenji Furihata |
| 3rd Author's Affiliation | Shinshu University (Shinshu Univ.) |
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| Speaker | Author-1 |
| Date Time | 2011-10-29 11:15:00 |
| Presentation Time | 30 minutes |
| Registration for | EA |
| Paper # | EA2011-80 |
| Volume (vol) | vol.111 |
| Number (no) | no.270 |
| Page | pp.73-78 |
| #Pages | 6 |
| Date of Issue | 2011-10-21 (EA) |
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