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| Presentation | 2023-05-25 14:00 Weighting functions to suppress artifacts due to cyclic convolution in acoustic measurements based on discrete Fourier transform Hideki Kawahara (Wakayama Univ.), Kohei Yatabe (Tokyo Univ. Agriculture Tech.), Mitsunori Mizumachi (Kyushu Inst. Tech.), Ken-Ichi Sakakibara (Health Science Univ. Hokkaido)  EA2023-1 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The Fast Fourier Transform (FFT) is a common practice in acoustic impulse response measurement and processing due to its efficient computation of the Discrete Fourier transform (DFT). DFT assumes that signals are periodic, which is valid for periodic test signals. However, signals other than the test signals acquired in acoustic measurements do not have the same periodicity, resulting in artifacts caused by signal truncation. To circumvent this issue, we introduce weighting functions that minimize these artifacts by reducing the side-lobe levels of the differentiated weighting functions. We selected these functions from a set that preserves the periodicity. We designed the weighting functions through numerical optimization and integrated them into an interactive, real-time tool that uses a generalized set of test signals we propose. The tools and corresponding MATLAB codes are accessible in the first author's GitHub repository. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | impulse response / Walsh-Hadamard matri / signal safeguarding / CAPRICEP / post hoc analysis / discrete Fourier transform / / | |
| Reference Info. | IEICE Tech. Rep., vol. 123, no. 53, EA2023-1, pp. 1-8, May 2023. | |
| Paper # | EA2023-1 | |
| Date of Issue | 2023-05-18 (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 | EA2023-1 |
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| Conference Information | |
| Committee | EA |
| Conference Date | 2023-05-25 - 2023-05-25 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | EA |
| Conference Code | 2023-05-EA |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Weighting functions to suppress artifacts due to cyclic convolution in acoustic measurements based on discrete Fourier transform |
| Sub Title (in English) | |
| Keyword(1) | impulse response |
| Keyword(2) | Walsh-Hadamard matri |
| Keyword(3) | signal safeguarding |
| Keyword(4) | CAPRICEP |
| Keyword(5) | post hoc analysis |
| Keyword(6) | discrete Fourier transform |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Hideki Kawahara |
| 1st Author's Affiliation | Wakayama University (Wakayama Univ.) |
| 2nd Author's Name | Kohei Yatabe |
| 2nd Author's Affiliation | Tokyo University of Agriculture and Technology (Tokyo Univ. Agriculture Tech.) |
| 3rd Author's Name | Mitsunori Mizumachi |
| 3rd Author's Affiliation | Kyushu Institute of Technology (Kyushu Inst. Tech.) |
| 4th Author's Name | Ken-Ichi Sakakibara |
| 4th Author's Affiliation | Health Science University of Hokkaido (Health Science Univ. Hokkaido) |
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| Speaker | Author-1 |
| Date Time | 2023-05-25 14:00:00 |
| Presentation Time | 25 minutes |
| Registration for | EA |
| Paper # | EA2023-1 |
| Volume (vol) | vol.123 |
| Number (no) | no.53 |
| Page | pp.1-8 |
| #Pages | 8 |
| Date of Issue | 2023-05-18 (EA) |
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