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Paper Abstract and Keywords
Presentation 2025-07-06 10:00
Examples of acoustic conditions measured using safeguarded speech and musical contents
Hideki Kawahara (Wakayama Univ.), Ken-Ichi Sakakibara (Health Sciences Univ. Hokkaido), Kohei Yatabe (Tokyo Univ. Agriculture Tech.) EA2025-17
Abstract (in Japanese) (See Japanese page) 
(in English) Several years ago, we proposed a simple method to convert (almost) any sound into a signal suitable for acoustic impulse response measurements by setting a lower limit for the absolute value of each discrete frequency bin. The method utilizes the discrete Fourier transform, a unitary transform that preserves the number of elements.
We reformulated the signal safeguarding based on a concept called "Giant-FFT," originally introduced as an elegant algorithm for sampling rate conversion.
This article reports the effects of modifications and extensions of the procedure based on our preliminary application of the method to various practical situations. These include, for example, frequency-dependent lower limits, processing of arbitrary-length signals, repetition-free measurement, and alignment of different A/D and D/A sampling clocks.
We conducted tests by simulations using several RIR (room impulse response) databases and real-world data to evaluate these extensions.
We open-sourced a generalized signal safeguarding function with a built-in giant-FFT-based sampling-rate conversion.
Keyword (in Japanese) (See Japanese page) 
(in English) Discrete Fourier transform / Fast Fourier transform / room impulse response / sampling-rate conversion / periodicity / unitary transformation / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 98, EA2025-17, pp. 32-37, July 2025.
Paper # EA2025-17 
Date of Issue 2025-06-28 (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 EA2025-17

Conference Information
Committee EA ASJ-H ASJ-MA  
Conference Date 2025-07-05 - 2025-07-06 
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 2025-07-EA-H-MA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Examples of acoustic conditions measured using safeguarded speech and musical contents 
Sub Title (in English)  
Keyword(1) Discrete Fourier transform  
Keyword(2) Fast Fourier transform  
Keyword(3) room impulse response  
Keyword(4) sampling-rate conversion  
Keyword(5) periodicity  
Keyword(6) unitary transformation  
Keyword(7)  
Keyword(8)  
1st Author's Name Hideki Kawahara  
1st Author's Affiliation Wakayama University (Wakayama Univ.)
2nd Author's Name Ken-Ichi Sakakibara  
2nd Author's Affiliation Health Sciences University of Hokkaido (Health Sciences Univ. Hokkaido)
3rd Author's Name Kohei Yatabe  
3rd Author's Affiliation Tokyo University of Agriculture and Technology (Tokyo Univ. Agriculture Tech.)
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Speaker Author-1 
Date Time 2025-07-06 10:00:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2025-17 
Volume (vol) vol.125 
Number (no) no.98 
Page pp.32-37 
#Pages 6 
Date of Issue 2025-06-28 (EA) 

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