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Paper Abstract and Keywords
Presentation 2009-10-23 13:25
Measurement of Acoustic Impedances of Ear Canals by Two Microphone Method of Impedance Tube
Toshio Kogasaka, Kenji Furihata (Shinshu Univ.) EA2009-73
Abstract (in Japanese) (See Japanese page) 
(in English) Computer simulation of acoustic scenes is an important prerequisite of rendering. Technology for 3-D sound reproduction, the so-called “audio front end” or the “acoustic human-machine interface” is an essential component of VR systems, which must be capable of fulfilling high quality standards involving psycho-acoustically relevant cues. One of the factors that can affect the sound transmission in the ear is the acoustic impedance of the ear canal. Its importance is related to the contribution of other elements involved in the transmission such as the earphone impedance. In order to determine the acoustic impedances used for human ear canals, the standardized method for measurement of complex impedances used for the measurement of the audiometric earphone impedances was applied. It is based on the transfer function between two microphone locations in an impedance tube. The end of the tube representing the measurement plane was placed at the ear canal entrance. Thus, the impedance seen from the entrance inward was measured on 9 subjects. From the results, (a) the dips (about 0.2) of the sound pressure reflectances of the ear canal are in about 2 kHz and 8 kHz, and (b) the peaks of the ear canal impedances are in about 200 Hz to 1 kHz and 6kHz to 9kHz.
Keyword (in Japanese) (See Japanese page) 
(in English) 3-D sound reproduction / Acoustic impedance / Ear canal / Sound pressure reflectance / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 240, EA2009-73, pp. 101-106, Oct. 2009.
Paper # EA2009-73 
Date of Issue 2009-10-15 (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)
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Conference Information
Committee EA  
Conference Date 2009-10-22 - 2009-10-23 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
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Paper Information
Registration To EA 
Conference Code 2009-10-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Measurement of Acoustic Impedances of Ear Canals by Two Microphone Method of Impedance Tube 
Sub Title (in English)  
Keyword(1) 3-D sound reproduction  
Keyword(2) Acoustic impedance  
Keyword(3) Ear canal  
Keyword(4) Sound pressure reflectance  
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1st Author's Name Toshio Kogasaka  
1st Author's Affiliation Shinshu Umiversity (Shinshu Univ.)
2nd Author's Name Kenji Furihata  
2nd Author's Affiliation Shinshu Umiversity (Shinshu Univ.)
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Speaker Author-1 
Date Time 2009-10-23 13:25:00 
Presentation Time 25 minutes 
Registration for EA 
Paper # EA2009-73 
Volume (vol) vol.109 
Number (no) no.240 
Page pp.101-106 
#Pages 6 
Date of Issue 2009-10-15 (EA) 

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