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Paper Abstract and Keywords
Presentation 2019-10-29 10:25
Audio spot using subdivided sub-band delivery from multiple parametric speakers
Kazuhiro Kondo (Yamagata Univ.), Shinnichiro Osanai (Alpine) EA2019-45
Abstract (in Japanese) (See Japanese page) 
(in English) Parametric array speakers can deliver an audible sound beam by modulating sound using an ultrasonic carrier wave and playing this modulated signal from an ultrasonic transducer array at high levels. Audible sound is demodulated in a narrow beam due to the nonlinear aerial transfer characteristics. However, if sound can be delivered within a small region, i. e., within a spot, sound can be delivered only to the intended subject, and avoid leakage to others. This is partially possible by generating the carrier wave and the side-band signal of the modulated signal from separate arrays, resulting in the full demodulation of an audible sound at the intersection of the two beams. However, we found that some audible noise was generated through demodulation of the side-band signal itself. We observed that the level of this noise is proportional to the relative frequency difference within the side-band signal. Thus, we divided the side-band signal into several sub-bands, limiting the frequency range within each sub-band, and generating them from separate arrays, intersecting only at the spotlight. By using 5 sub-bands, it was possible to limit the spotlight to an effective volume of 0.2 m by 0.2 m by 0.2 m, while the audible noise of the surrounding region was reduced to 20 dB lower levels.
Keyword (in Japanese) (See Japanese page) 
(in English) parametric speakers / audio spot / subdivided side-band / / / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 253, EA2019-45, pp. 59-65, Oct. 2019.
Paper # EA2019-45 
Date of Issue 2019-10-21 (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 EA2019-45

Conference Information
Committee EA ASJ-H  
Conference Date 2019-10-28 - 2019-10-29 
Place (in Japanese) (See Japanese page) 
Place (in English) NHK Science&Technology Research Lab. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Engineering/Electro Acoustics, Psychological and Physiological Acoustics, High-Reality Audio, Spatial Audio, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2019-10-EA-H 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Audio spot using subdivided sub-band delivery from multiple parametric speakers 
Sub Title (in English)  
Keyword(1) parametric speakers  
Keyword(2) audio spot  
Keyword(3) subdivided side-band  
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1st Author's Name Kazuhiro Kondo  
1st Author's Affiliation Yamagata University (Yamagata Univ.)
2nd Author's Name Shinnichiro Osanai  
2nd Author's Affiliation Alpine Electronics (Alpine)
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Speaker Author-1 
Date Time 2019-10-29 10:25:00 
Presentation Time 25 minutes 
Registration for EA 
Paper # EA2019-45 
Volume (vol) vol.119 
Number (no) no.253 
Page pp.59-65 
#Pages 7 
Date of Issue 2019-10-21 (EA) 

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