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Paper Abstract and Keywords
Presentation 2007-08-09 16:50
Elimination of acoustic oscillation by a comb filter and frequency shifting
Kaoru Ashihara (AIST), Kenji Itagaki, Shogo Kiryu (Mi-tech) EA2007-45
Abstract (in Japanese) (See Japanese page) 
(in English) A technique to reduce acoustic oscillation is proposed. It contains a comb filter and a frequency shifter. The comb filter has a number of elimination bands. The frequencies of signals are shifted by several % by the frequency shifter. Each time the signals return to the input, their frequency is shifted and they will enter the elimination bands. By using this method, acoustic feedbacks can be reduced without knowing the exact frequency of oscillation. The oscillation margin of 6 dB was obtained in software simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) acoustic feedback / frequency shifter / comb filter / Hilbert transform / hearing aid / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 186, EA2007-45, pp. 37-42, Aug. 2007.
Paper # EA2007-45 
Date of Issue 2007-08-02 (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 EA2007-45

Conference Information
Committee EA  
Conference Date 2007-08-09 - 2007-08-10 
Place (in Japanese) (See Japanese page) 
Place (in English) School of Engineering, Tohoku University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Hearing, Audio Signal Processing, etc. 
Paper Information
Registration To EA 
Conference Code 2007-08-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Elimination of acoustic oscillation by a comb filter and frequency shifting 
Sub Title (in English)  
Keyword(1) acoustic feedback  
Keyword(2) frequency shifter  
Keyword(3) comb filter  
Keyword(4) Hilbert transform  
Keyword(5) hearing aid  
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1st Author's Name Kaoru Ashihara  
1st Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
2nd Author's Name Kenji Itagaki  
2nd Author's Affiliation Musashi Institute of Technology (Mi-tech)
3rd Author's Name Shogo Kiryu  
3rd Author's Affiliation Musashi Institute of Technology (Mi-tech)
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Speaker Author-1 
Date Time 2007-08-09 16:50:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2007-45 
Volume (vol) vol.107 
Number (no) no.186 
Page pp.37-42 
#Pages 6 
Date of Issue 2007-08-02 (EA) 

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