| Presentation | 2015-03-03 Beamforming with reflector by using array manifold vector based on the FDTD method Hitomi NAKASHIMA, Yoichi HANEDA, Kenta NIWA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently, a microphone array with a reflector, which uses the acoustical information produced by the reflector such as reflections and diffractions, has been investigated to suppress the ambient noise. By using the reflection or diffraction information, as the differences between the transmission characteristics of the two closely located sound sources are enhanced, the microphone array can separate these two source signals. However, if a reflector with a complex shape is used, obtaining transmission characteristics that have to be set in advance, such as the array manifold vector, becomes complicated. A method to obtain the transmission characteristics is the measurement of the impulse responses; however, the measurements of the actual data are often cumbersome. Therefore, to determine the transmission characteristics, we considered performing a series of simulations based on the finite-difference time-domain (FDTD) method. We evaluated the noise suppression performance for the microphone array using the transmission characteristics created by the FDTD simulation for a parabola reflector and a circular disc. The results showed that it is possible to sufficiently suppress the noise by the proposed method, although the bandwidth was less than 2 kHz. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Microphone array / Beamforming / Parabolic reflector / FDTD method / ML method |
| Paper # | EA2014-110,SIP2014-151,SP2014-173 |
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| Conference Information | |
| Committee | EA |
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| Conference Date | 2015/2/23(1days) |
| Place (in Japanese) | (See Japanese page) |
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| 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) | Beamforming with reflector by using array manifold vector based on the FDTD method |
| Sub Title (in English) | |
| Keyword(1) | Microphone array |
| Keyword(2) | Beamforming |
| Keyword(3) | Parabolic reflector |
| Keyword(4) | FDTD method |
| Keyword(5) | ML method |
| 1st Author's Name | Hitomi NAKASHIMA |
| 1st Author's Affiliation | Graduate School of Informations and Engineering, The University of Electro-Communications() |
| 2nd Author's Name | Yoichi HANEDA |
| 2nd Author's Affiliation | Graduate School of Informations and Engineering, The University of Electro-Communications |
| 3rd Author's Name | Kenta NIWA |
| 3rd Author's Affiliation | NTT Media Intelligence Laboratories |
| Date | 2015-03-03 |
| Paper # | EA2014-110,SIP2014-151,SP2014-173 |
| Volume (vol) | vol.114 |
| Number (no) | 473 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |