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Paper Abstract and Keywords
Presentation 2007-12-07 14:20
Hardware implementation of comb filter and frequency shifter for elimination of acoustic oscillation
Kenji Itagaki (Mi-Tech), Kaoru Ashihara, Ryuzo Horiuchi (AIST), Shogo Kiryu (Mi-Tech) EA2007-91
Abstract (in Japanese) (See Japanese page) 
(in English) It has been reported that the combination of a comb filter and a frequency shifter can reduce the acoustic oscillation. In the present study, the comb filter and the frequency shifter were processed simultaneously by FIR filters that used Hilbert transformer. The FIR filters were implemented on the FPGA board with the audio CODEC. A microphone and a loudspeaker were connected to the CODEC so that the oscillation margin could be measured. When the combination of the comb filter and the frequency shifter was employed, the oscillation margin as much as 12 dB was achieved. It was confirmed that the method was effective especially against the oscillation at the higher frequencies.
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. 370, EA2007-91, pp. 31-36, Dec. 2007.
Paper # EA2007-91 
Date of Issue 2007-11-30 (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 2007-12-07 - 2007-12-07 
Place (in Japanese) (See Japanese page) 
Place (in English) NHK Science & Technical Research Laboratories 
Topics (in Japanese) (See Japanese page) 
Topics (in English) 3D-Audio, Transducers/General 
Paper Information
Registration To EA 
Conference Code 2007-12-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Hardware implementation of comb filter and frequency shifter for elimination of acoustic oscillation 
Sub Title (in English)  
Keyword(1) acoustic feedback  
Keyword(2) frequency shifter  
Keyword(3) comb filter  
Keyword(4) Hilbert transform  
Keyword(5) hearing aid  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Kenji Itagaki  
1st Author's Affiliation Musashi Institute of Technology (Mi-Tech)
2nd Author's Name Kaoru Ashihara  
2nd Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
3rd Author's Name Ryuzo Horiuchi  
3rd Author's Affiliation National Institute of Advanced Industrial Science and Technology (AIST)
4th Author's Name Shogo Kiryu  
4th Author's Affiliation Musashi Institute of Technology (Mi-Tech)
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Speaker Author-1 
Date Time 2007-12-07 14:20:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2007-91 
Volume (vol) vol.107 
Number (no) no.370 
Page pp.31-36 
#Pages 6 
Date of Issue 2007-11-30 (EA) 

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