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Paper Abstract and Keywords
Presentation 2008-10-24 10:45
Measurement of Acoustical Characteristics by Two Microphone Method in External Ear Canal under Opening and Sealing
Toshio Kogasaka, Kenji Furihata (Shinshu Univ,) EA2008-77
Abstract (in Japanese) (See Japanese page) 
(in English) The binaural technique is used for methods of sound recording, synthesis and reproduction, where the signals in focus are the acoustic signals at the eardrums. The impedance presented to the ear canal by the eardrum strongly affects the free-field response of the ear in the vicinity of resonance and is crucial when the ear is driven by an earphone inserted into the canal. In this paper, the parameter values of the eardrum impedance were measured by the two-microphone systems proposed with the following conditions: (a) the free-field response when the ear is driven by a loudspeaker and a bone conduction (b) the oclluded-ear response when the ear is driven by an earphone (ER-6) and a bone conduction. The eardrum impedance values (MKSΩ) were calculated values based on the simplifying assumptions that the human ear canal can be treated as a uniform cylinder with diameters from 7.2mm to 8.3mm. From the results, it can be found that the variability of ear-canal geometry and ear impedance among individuals.
Keyword (in Japanese) (See Japanese page) 
(in English) Two-microphone method / Transfer function / Bone conduction / Eardrum impedance / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 255, EA2008-77, pp. 73-78, Oct. 2008.
Paper # EA2008-77 
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) Measurement of Acoustical Characteristics by Two Microphone Method in External Ear Canal under Opening and Sealing 
Sub Title (in English)  
Keyword(1) Two-microphone method  
Keyword(2) Transfer function  
Keyword(3) Bone conduction  
Keyword(4) Eardrum impedance  
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1st Author's Name Toshio Kogasaka  
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 10:45:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2008-77 
Volume (vol) vol.108 
Number (no) no.255 
Page pp.73-78 
#Pages 6 
Date of Issue 2008-10-16 (EA) 

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