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Paper Abstract and Keywords
Presentation 2014-03-28 17:15
A study of directional speaker using a digitally direct-driven system
Takemichi Ishikawa, Syuma Yokoyama, dai Takahashi, Satochi Saikatu, Akira Yasuda (Hosei Univ.) EA2013-127
Abstract (in Japanese) (See Japanese page) 
(in English) The paper proposes a novel directive control method with amplitude-phase control for a beam forming speaker by using a digitally direct-driven system with an array loudspeaker. This system can achieve high directivity and control side-lobe attenuation with the amplitude-phase control. The output pulse width is controlled using pulse width modulation for changing the amplitude and phase by using several 1-bit D flip-flops because the sub-loudspeakers are driven by 1-bit digital signals without digital-to-analog controllers and amplifiers. A segmented noise shaping dynamic element matching method is used to reduce the noise generated by the mismatch of sub-loudspeakers, which degrades the signal-to-noise ratio. Furthermore, we research the influence by the difference in number of the units.
Keyword (in Japanese) (See Japanese page) 
(in English) Digitally Direct-Driven System / Directivity Control / Side-lobe / Pulse Width Modulation / NSDEM / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 503, EA2013-127, pp. 43-48, March 2014.
Paper # EA2013-127 
Date of Issue 2014-03-21 (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 EA2013-127

Conference Information
Committee EA  
Conference Date 2014-03-28 - 2014-03-28 
Place (in Japanese) (See Japanese page) 
Place (in English) NHK Science & Technology Research Labs. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General topics 
Paper Information
Registration To EA 
Conference Code 2014-03-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study of directional speaker using a digitally direct-driven system 
Sub Title (in English)  
Keyword(1) Digitally Direct-Driven System  
Keyword(2) Directivity Control  
Keyword(3) Side-lobe  
Keyword(4) Pulse Width Modulation  
Keyword(5) NSDEM  
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1st Author's Name Takemichi Ishikawa  
1st Author's Affiliation Hosei University (Hosei Univ.)
2nd Author's Name Syuma Yokoyama  
2nd Author's Affiliation Hosei University (Hosei Univ.)
3rd Author's Name dai Takahashi  
3rd Author's Affiliation Hosei University (Hosei Univ.)
4th Author's Name Satochi Saikatu  
4th Author's Affiliation Hosei University (Hosei Univ.)
5th Author's Name Akira Yasuda  
5th Author's Affiliation Hosei University (Hosei Univ.)
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Speaker Author-1 
Date Time 2014-03-28 17:15:00 
Presentation Time 25 minutes 
Registration for EA 
Paper # EA2013-127 
Volume (vol) vol.113 
Number (no) no.503 
Page pp.43-48 
#Pages 6 
Date of Issue 2014-03-21 (EA) 

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