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| Presentation | 2014-03-28 17:15 A study of directional speaker using a digitally direct-driven system Takemichi Ishikawa, Syuma Yokoyama, dai Takahashi, Satochi Saikatu, Akira Yasuda (Hosei Univ.)  EA2013-127 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The paper proposes a novel directive control method with amplitude-phase control for a beam forming speaker by using a digitally direct-driven system with an array loudspeaker. This system can achieve high directivity and control side-lobe attenuation with the amplitude-phase control. The output pulse width is controlled using pulse width modulation for changing the amplitude and phase by using several 1-bit D flip-flops because the sub-loudspeakers are driven by 1-bit digital signals without digital-to-analog controllers and amplifiers. A segmented noise shaping dynamic element matching method is used to reduce the noise generated by the mismatch of sub-loudspeakers, which degrades the signal-to-noise ratio. Furthermore, we research the influence by the difference in number of the units. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Digitally Direct-Driven System / Directivity Control / Side-lobe / Pulse Width Modulation / NSDEM / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 113, no. 503, EA2013-127, pp. 43-48, March 2014. | |
| Paper # | EA2013-127 | |
| Date of Issue | 2014-03-21 (EA) | |
| 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 | EA2013-127 |
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| Conference Information | |
| Committee | EA |
| Conference Date | 2014-03-28 - 2014-03-28 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | NHK Science & Technology Research Labs. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | General topics |
| Paper Information | |
| Registration To | EA |
| Conference Code | 2014-03-EA |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A study of directional speaker using a digitally direct-driven system |
| Sub Title (in English) | |
| Keyword(1) | Digitally Direct-Driven System |
| Keyword(2) | Directivity Control |
| Keyword(3) | Side-lobe |
| Keyword(4) | Pulse Width Modulation |
| Keyword(5) | NSDEM |
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| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Takemichi Ishikawa |
| 1st Author's Affiliation | Hosei University (Hosei Univ.) |
| 2nd Author's Name | Syuma Yokoyama |
| 2nd Author's Affiliation | Hosei University (Hosei Univ.) |
| 3rd Author's Name | dai Takahashi |
| 3rd Author's Affiliation | Hosei University (Hosei Univ.) |
| 4th Author's Name | Satochi Saikatu |
| 4th Author's Affiliation | Hosei University (Hosei Univ.) |
| 5th Author's Name | Akira Yasuda |
| 5th Author's Affiliation | Hosei University (Hosei Univ.) |
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| Speaker | Author-1 |
| Date Time | 2014-03-28 17:15:00 |
| Presentation Time | 25 minutes |
| Registration for | EA |
| Paper # | EA2013-127 |
| Volume (vol) | vol.113 |
| Number (no) | no.503 |
| Page | pp.43-48 |
| #Pages | 6 |
| Date of Issue | 2014-03-21 (EA) |
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