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Paper Abstract and Keywords
Presentation 2026-07-13 10:00
Speech Leakage Suppression Using Spatial Speech Envelope Coding and Active Auditory Masking for Audio-Spot Design with Parametric Array Loudspeakers
Tomoki Hashida, Yuting Geng, Takanobu Nishiura (Ritsumeikan Univ.) US2026-16 EA2026-6
Abstract (in Japanese) (See Japanese page) 
(in English) A parametric array loudspeaker (PAL) represents the target audible sound only within the propagation area of ultrasound, forming an audio-spot. However, unintended listeners in this area may also perceive the sound, causing speech leakage when the target signal is speech. To address this issue, an auditory masking-based audio-spot design method has been proposed. In this method, the target speech signal is mixed with masker and anti-masker signals and emitted from two intersecting PALs. By spatially controlling auditory masking, audio-spot is formed only at and around the intersection of the normal axes of the two PALs. However, it requires a high masker sound pressure level, which may be perceived as noise.
To overcome this limitation, we propose an audio-spot design method that combines spatial speech envelope coding and active auditory masking. The target speech signal is encoded into two complementary signals based on its temporal and spectral envelope information. These signals are individually mixed with the masker and anti-masker signals. At the audio-spot, auditory masking is canceled and the speech envelope is spatially decoded, allowing target speech perception. Outside the audio-spot, intelligibility is degraded by both auditory masking and envelope encoding. Evaluation results based on dictation tests and objective metrics show that the proposed method reduces the required masker sound pressure level while maintaining speech leakage suppression.
Keyword (in Japanese) (See Japanese page) 
(in English) Audio-Spot / Speech Leakage / Parametric Array Loudspeaker / Auditory Masking / Speech Envelope / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 106, EA2026-6, pp. 1-6, July 2026.
Paper # EA2026-6 
Date of Issue 2026-07-06 (US, 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 US2026-16 EA2026-6

Conference Information
Committee EA US ASJ-H  
Conference Date 2026-07-13 - 2026-07-14 
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 2026-07-EA-US-H 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Speech Leakage Suppression Using Spatial Speech Envelope Coding and Active Auditory Masking for Audio-Spot Design with Parametric Array Loudspeakers 
Sub Title (in English)  
Keyword(1) Audio-Spot  
Keyword(2) Speech Leakage  
Keyword(3) Parametric Array Loudspeaker  
Keyword(4) Auditory Masking  
Keyword(5) Speech Envelope  
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1st Author's Name Tomoki Hashida  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Yuting Geng  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Takanobu Nishiura  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2026-07-13 10:00:00 
Presentation Time 25 minutes 
Registration for EA 
Paper # US2026-16, EA2026-6 
Volume (vol) vol.126 
Number (no) no.105(US), no.106(EA) 
Page pp.1-6 
#Pages 6 
Date of Issue 2026-07-06 (US, EA) 

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