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Paper Abstract and Keywords
Presentation 2008-10-24 14:15
Influence of Transmission Rod of Earplug Type Transducer on Demodulated Audible Sound from Amplitude Modulation Ultrasonic
Yoshifumi Shinfuku, Kenji Furihata (Shinshu Univ,) EA2008-81
Abstract (in Japanese) (See Japanese page) 
(in English) In a previous paper, an earplug type earphone by contact with an ultrasonic transducer was proposed. The earplug type earphone is composed of a versatile earplug and an ultrasonic transducer contacting a transmission rod, which transmits mechanical amplitude modulation ultrasonic vibrations (modified double side band; MDSB) to the earplug, and therefore can produce audible sound demodulated sound pressure directly in the small cavity enclosed by the earplug and one’s eardrum. This paper has been experimentally discussed the relation between the acoustic characteristics of the earplug type earphone and adjusting the proper thickness and diameter of the vibration transmission rod for four kinds of materials (polyvinyl chloride, cork, chamaecyparis obtusa, and expanded poly styrene). From the results, in case of chamaecyparis obtusa 20mm thick, it can be found that this earphone is obtained nearly flat frequency characteristics 75 dB±2dB(SPL) in the range from 315Hz to 2 kHz (an input voltage is 15 Vrms).
Keyword (in Japanese) (See Japanese page) 
(in English) Earplug type earphone / Ultrasonic / Earplug / Amplitude modulation / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 255, EA2008-81, pp. 97-102, Oct. 2008.
Paper # EA2008-81 
Date of Issue 2008-10-16 (EA) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee EA  
Conference Date 2008-10-23 - 2008-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EA 
Conference Code 2008-10-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Influence of Transmission Rod of Earplug Type Transducer on Demodulated Audible Sound from Amplitude Modulation Ultrasonic 
Sub Title (in English)  
Keyword(1) Earplug type earphone  
Keyword(2) Ultrasonic  
Keyword(3) Earplug  
Keyword(4) Amplitude modulation  
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1st Author's Name Yoshifumi Shinfuku  
1st Author's Affiliation Shinshu University (Shinshu Univ,)
2nd Author's Name Kenji Furihata  
2nd Author's Affiliation Shinshu University (Shinshu Univ,)
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Speaker Author-1 
Date Time 2008-10-24 14:15:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2008-81 
Volume (vol) vol.108 
Number (no) no.255 
Page pp.97-102 
#Pages 6 
Date of Issue 2008-10-16 (EA) 

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