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| Presentation | 2012-05-24 14:45 An Evaluation of Demodulation for Parametric Loudspeaker based on Spectral Envelope Daisuke Ikefuji, Masato Nakayama, Masanori Morise, Takanobu Nishiura (Ritsumeikan Univ.)  EA2012-13 SIP2012-13 SP2012-13 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Parametric loudspeakers with sharper directivity can reproduce audible sounds to a particular area. Parametric loudspeakers emit an intense amplitude modulated wave designed by modulating the ultrasound with the audible sound. The emitted amplitude modulated wave is demodulated into the original audible sound because of a nonlinear interaction in the air. Demodulation ratio depends on power spectrum and sound pressure of the demodulated sound. In other words, reproduction of accurate sound with parametric loudspeakers needs the sufficient demodulation distance. Demodulation is evaluated by sound pressure level of the demodulated sound. However, no criterion has been proposed for measuring the demodulation ratio in the past. We therefore propose criterion to measure of demodulation ratio based on spectral envelope which indicates a shape of power spectrum. As a result of the evaluation experiment, we confirmed the effectiveness of the proposed criterion. Moreover, we confirmed the demodulation ratio depends on the sub-band of the audible sound. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Parametric loudspeaker / Ultrasound / Demodulation ratio / Spectral envelope / Evaluation criterion / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 112, no. 47, EA2012-13, pp. 71-77, May 2012. | |
| Paper # | EA2012-13 | |
| Date of Issue | 2012-05-17 (EA, SIP, SP) | |
| ISSN | Print edition: ISSN 0913-5685 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 | EA2012-13 SIP2012-13 SP2012-13 |
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| Conference Information | |
| Committee | EA SP SIP |
| Conference Date | 2012-05-24 - 2012-05-25 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Osaka Univ. Nakanoshima Center |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Speech and Acoustic Signal Processing, Speech, and Related Topics |
| Paper Information | |
| Registration To | EA |
| Conference Code | 2012-05-EA-SP-SIP |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | An Evaluation of Demodulation for Parametric Loudspeaker based on Spectral Envelope |
| Sub Title (in English) | |
| Keyword(1) | Parametric loudspeaker |
| Keyword(2) | Ultrasound |
| Keyword(3) | Demodulation ratio |
| Keyword(4) | Spectral envelope |
| Keyword(5) | Evaluation criterion |
| Keyword(6) | |
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| Keyword(8) | |
| 1st Author's Name | Daisuke Ikefuji |
| 1st Author's Affiliation | Ritsumeikan University (Ritsumeikan Univ.) |
| 2nd Author's Name | Masato Nakayama |
| 2nd Author's Affiliation | Ritsumeikan University (Ritsumeikan Univ.) |
| 3rd Author's Name | Masanori Morise |
| 3rd Author's Affiliation | Ritsumeikan University (Ritsumeikan Univ.) |
| 4th Author's Name | Takanobu Nishiura |
| 4th Author's Affiliation | Ritsumeikan University (Ritsumeikan Univ.) |
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| Speaker | Author-1 |
| Date Time | 2012-05-24 14:45:00 |
| Presentation Time | 25 minutes |
| Registration for | EA |
| Paper # | EA2012-13, SIP2012-13, SP2012-13 |
| Volume (vol) | vol.112 |
| Number (no) | no.47(EA), no.48(SIP), no.49(SP) |
| Page | pp.71-77 |
| #Pages | 7 |
| Date of Issue | 2012-05-17 (EA, SIP, SP) |
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