| Presentation | 2016-03-29 [Poster Presentation] Directivity control for a regular icosahedron loudspeaker based on the adaptive weighted least-squares method. Makoto Daikohara, Yoichi Haneda, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes an adaptive weighted least-squares method for controlling the directivity of a loudspeaker array. If we use the conventional least-squares method to design the filter of a loudspeaker array, high level sidelobes appear in the directivity pattern. In our previous study, we demonstrated that sidelobes can be suppressed using the weighted least-squares method. However, the weight coefficients were decided heuristically. In this study, to decide the optimum weight coefficients automatically, we investigate the adaptive algorithm of the least-squares method. First, we set an ideal directivity pattern by using the window function, and obtain the filter coefficients of the target loudspeaker array based on the least-squares method with an initial weighting factor. Next, we update the weighting factor by using the error between the ideal directional and radiation patterns, which are calculated by convoluting the filter coefficients and the transfer functions. Then, we repeat this process until the error level is satisfied by the end condition of the update. To confirm the performance of our proposed algorithm, we compared the proposed method with conventional least-squares-method. These results showed that the proposed method suppressed the sidelobes more efficiently than the conventional least-squares method; however, the main beam width in the case of the former was greater than that of the latter. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | loudspeaker array / least-squares-method / weight / directivity control / regular icosahedoron |
| Paper # | EA2015-105,SIP2015-154,SP2015-133 |
| Date of Issue | 2016-03-21 (EA, SIP, SP) |
| Conference Information | |
| Committee | EA / SP / SIP |
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| Conference Date | 2016/3/28(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Beppu International Convention Center B-ConPlaza |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Engineering/Electro Acoustics, Speech, Signal Processing, and Related Topics |
| Chair | Yoichi Haneda(Univ. of Electro-Comm.) / Kazunori Mano(Shibaura Inst. of Tech.) / Osamu Houshuyama(NEC) |
| Vice Chair | Yukio Iwaya(Tohoku Gakuin Univ.) / Mitsunori Mizumachi(Kyushu Inst. of Tech.) / Norihide Kitaoka(Tokushima Univ.) / Makoto Nakashizuka(Chiba Inst. of Tech.) / Masahiro Okuda(Univ. of Kitakyushu) |
| Secretary | Yukio Iwaya(NTT) / Mitsunori Mizumachi(KDDI R&D Labs.) / Norihide Kitaoka(Tokyo City Univ.) / Makoto Nakashizuka(Kobe Univ.) / Masahiro Okuda(NEC) |
| Assistant | Shoichi Koyama(Univ. of Tokyo) / Takashi Nose(Tohoku Univ.) / Taichi Asami(NTT) / Takamichi Miyata(Chiba Inst. of Tech.) |
| Paper Information | |
| Registration To | Technical Committee on Engineering Acoustics / Technical Committee on Speech / Technical Committee on Signal Processing |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Poster Presentation] Directivity control for a regular icosahedron loudspeaker based on the adaptive weighted least-squares method. |
| Sub Title (in English) | |
| Keyword(1) | loudspeaker array |
| Keyword(2) | least-squares-method |
| Keyword(3) | weight |
| Keyword(4) | directivity control |
| Keyword(5) | regular icosahedoron |
| Keyword(6) | |
| 1st Author's Name | Makoto Daikohara |
| 1st Author's Affiliation | The University of Electro-Communications(UEC) |
| 2nd Author's Name | Yoichi Haneda |
| 2nd Author's Affiliation | The University of Electro-Communications(UEC) |
| Date | 2016-03-29 |
| Paper # | EA2015-105,SIP2015-154,SP2015-133 |
| Volume (vol) | vol.115 |
| Number (no) | EA-521,SIP-522,SP-523 |
| Page | pp.pp.213-218(EA), pp.213-218(SIP), pp.213-218(SP), |
| #Pages | 6 |
| Date of Issue | 2016-03-21 (EA, SIP, SP) |