| Presentation | 2015-03-03 Directivity control of a dodecahedron loudspeaker array by using a minimum variance beamformer in a spherical harmonics domain Kazuna BANDO, Yoichi HANEDA, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper describes a directivity control method for a spherical loudspeaker array. The beam pattern of the spherical loudspeaker array with filter coefficients designed considering a spherical harmonic expansion has a high directivity not only in the target direction but also in the opposite side. This phenomenon is attributed to the filter that, by using the spherical harmonic expansion, produces only the simple radiation pattern. On the other hand, designing the filter by using the minimum variance (MV) beamformer method in coordinates is also possible in order to avoid the unwanted high sidelobes in the opposite directions. However, if the beam pattern is rotated in an arbitrary direction, the filter needs to be redesigned for all the directions. To overcome this problem, we investigated the MV method in spherical harmonics domains. The typical filter calculated by this method can be easily transformed into a filter at other angles while avoiding the unwanted high sidelobes. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Directivity control / Spherical harmonics / Minimum varience bearm former / Dodecahedron / Loudspeaker array |
| Paper # | EA2014-112,SIP2014-153,SP2014-175 |
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| Conference Information | |
| Committee | EA |
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| Conference Date | 2015/2/23(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Engineering Acoustics (EA) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Directivity control of a dodecahedron loudspeaker array by using a minimum variance beamformer in a spherical harmonics domain |
| Sub Title (in English) | |
| Keyword(1) | Directivity control |
| Keyword(2) | Spherical harmonics |
| Keyword(3) | Minimum varience bearm former |
| Keyword(4) | Dodecahedron |
| Keyword(5) | Loudspeaker array |
| 1st Author's Name | Kazuna BANDO |
| 1st Author's Affiliation | Graduata School of Informations and Engineering, The University of Electro-Communications() |
| 2nd Author's Name | Yoichi HANEDA |
| 2nd Author's Affiliation | Graduata School of Informations and Engineering, The University of Electro-Communications |
| Date | 2015-03-03 |
| Paper # | EA2014-112,SIP2014-153,SP2014-175 |
| Volume (vol) | vol.114 |
| Number (no) | 473 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |