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Paper Abstract and Keywords
Presentation 2026-03-18 14:40
Adaptive Speech Semantic Communications in Rate-Limited Environments
Futo Iwanaga (Kyoto Inst. of Tech.), Daisuke Umehara (Kyoto Inst. of Tech) CAS2025-122 CS2025-115
Abstract (in Japanese) (See Japanese page) 
(in English) In environments where bandwidth is severely limited, such as disaster communications, adaptively switching communication methods according to available channel quality is a critical challenge. This paper proposes an adaptive speech semantic communication system that automatically selects among three communication modes based on SNR conditions. The proposed system comprises three modes: DeepSC-ST for ultra-low bitrate operation (approximately 2 kbps, Mode 1), DeepSC-S for balanced acoustic information transmission (approximately 17.5 kbps, Mode 2), and the conventional G.711 codec for high-quality communication (64 kbps, Mode 3). SNR thresholds with hysteresis margins prevent mode chattering and ensure system stability. Simulation evaluations on the TIMIT dataset over AWGN, Rayleigh, and Rician fading channels confirm that Mode 1 achieves the highest PESQ efficiency per unit bitrate, Mode 2 provides balanced performance, and Mode 3 delivers superior absolute audio quality metrics. This system provides a novel approach demonstrating the effectiveness of adaptive communication resource management in bandwidth-constrained environments.
Keyword (in Japanese) (See Japanese page) 
(in English) Semantic Communication / Deep Learning / DeepSC-ST / DeepSC-S / Adaptive Communications / Audio signal transmission / Wireless communication /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 415, CS2025-115, pp. 196-200, March 2026.
Paper # CS2025-115 
Date of Issue 2026-03-10 (CAS, CS) 
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 CAS2025-122 CS2025-115

Conference Information
Committee CAS CS  
Conference Date 2026-03-17 - 2026-03-18 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Network processor, Signal processing and circuits for communications, Wireless LAN / PAN, etc. 
Paper Information
Registration To CS 
Conference Code 2026-03-CAS-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Adaptive Speech Semantic Communications in Rate-Limited Environments 
Sub Title (in English)  
Keyword(1) Semantic Communication  
Keyword(2) Deep Learning  
Keyword(3) DeepSC-ST  
Keyword(4) DeepSC-S  
Keyword(5) Adaptive Communications  
Keyword(6) Audio signal transmission  
Keyword(7) Wireless communication  
Keyword(8)  
1st Author's Name Futo Iwanaga  
1st Author's Affiliation Kyoto Institute of Technology (Kyoto Inst. of Tech.)
2nd Author's Name Daisuke Umehara  
2nd Author's Affiliation Kyoto Institute of Technology (Kyoto Inst. of Tech)
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Speaker Author-1 
Date Time 2026-03-18 14:40:00 
Presentation Time 20 minutes 
Registration for CS 
Paper # CAS2025-122, CS2025-115 
Volume (vol) vol.125 
Number (no) no.414(CAS), no.415(CS) 
Page pp.196-200 
#Pages 5 
Date of Issue 2026-03-10 (CAS, CS) 

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