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Paper Abstract and Keywords
Presentation 2026-05-22 13:50
[Invited Talk] Construction of sound-image hologram using parametric loudspeakers -- Efforts and future prospects regarding sound-image distance control --
Masato Nakayama, Takanobu Nishiura (Ritsumeikan Univ.) EA2026-5
Abstract (in Japanese) (See Japanese page) 
(in English) The reproduction of sound-images in mid-air, analogous to holograms, has the potential to significantly enhance the sense of presence in theaters, virtual live stages, and communication systems. The authors have been investigating methods for constructing acoustic holograms using parametric loudspeakers, exploiting their high directivity and nonlinear acoustic characteristics. To this end, various approaches have been proposed, including the formation of focused sound sources by arranging multiple parametric loudspeakers in an arc, the generation of focused sources through phase-controlled linear arrays, and hybrid methods combining parametric and dynamic loudspeakers based on the control of the direct-to-reverberant ratio derived from room impulse responses. These approaches aim to enable precise control of the perceived position and distance of sound-images.
In this talk, the fundamental principles and characteristics of parametric loudspeakers are first outlined. Then, the aforementioned methods are systematically reviewed. Finally, challenges toward practical implementation in real environments are discussed, along with future perspectives for applications of acoustic holography.
Keyword (in Japanese) (See Japanese page) 
(in English) Parametric loudspeakers / Acoustic holograms / Focused sound sources / Room impulse responses / Direct-to-reverberant ratio / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 34, EA2026-5, pp. 19-19, May 2026.
Paper # EA2026-5 
Date of Issue 2026-05-15 (EA) 
ISSN 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 EA2026-5

Conference Information
Committee EA  
Conference Date 2026-05-22 - 2026-05-22 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EA 
Conference Code 2026-05-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Construction of sound-image hologram using parametric loudspeakers 
Sub Title (in English) Efforts and future prospects regarding sound-image distance control 
Keyword(1) Parametric loudspeakers  
Keyword(2) Acoustic holograms  
Keyword(3) Focused sound sources  
Keyword(4) Room impulse responses  
Keyword(5) Direct-to-reverberant ratio  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Masato Nakayama  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Takanobu Nishiura  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2026-05-22 13:50:00 
Presentation Time 50 minutes 
Registration for EA 
Paper # EA2026-5 
Volume (vol) vol.126 
Number (no) no.34 
Page p.19 
#Pages 1 
Date of Issue 2026-05-15 (EA) 

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