| Presentation | 2015-03-03 Investigation of local area sound reproduction using a circular array of loudspeakers with null-space based sound field control Takayuki SEKI, Yoichi HANEDA, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We investigated a local area sound reproduction system where the listener can hear the sound only in the proximity of the loudspeaker. In this paper, we used the circular loudspeaker array with null-space based sound field control (NBSFC) to create a local area sound reproduction system based on the boundary surface control principle. The performance of the prototype system of the circular loudspeaker array was evaluated in an anechoic chamber. As a result, the prototype system exhibited a quicker sound attenuation than the monopole sound source in the frequency range of 500-1500 Hz. In addition, we compared the filter coefficients of the loudspeaker array of the NBSFC method with those of the evanescent wave method. In the NBSFC method, the filters on both side of the filter that has a positive phase have opposite phases and half amplitudes. On the other hand, in the evanescent wave method, the filters alternately exhibit a plus or minus sign while having the same amplitude. In both cases, the sounds radiated from the loudspeakers may instantaneously cancel each other by opposite phases to achieve a quicker sound attenuation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | local area sound reproduction / evanescent wave / circular array of loudspeakers / null-space based sound field control / boundary surface control principle |
| Paper # | EA2014-114,SIP2014-155,SP2014-177 |
| Date of Issue |
| Conference Information | |
| Committee | EA |
|---|---|
| Conference Date | 2015/2/23(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Engineering Acoustics (EA) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Investigation of local area sound reproduction using a circular array of loudspeakers with null-space based sound field control |
| Sub Title (in English) | |
| Keyword(1) | local area sound reproduction |
| Keyword(2) | evanescent wave |
| Keyword(3) | circular array of loudspeakers |
| Keyword(4) | null-space based sound field control |
| Keyword(5) | boundary surface control principle |
| 1st Author's Name | Takayuki SEKI |
| 1st Author's Affiliation | Department of Informatics, Graduate School of Informatics and Engineering, The Univercity of Electro-Communications() |
| 2nd Author's Name | Yoichi HANEDA |
| 2nd Author's Affiliation | Department of Informatics, Graduate School of Informatics and Engineering, The Univercity of Electro-Communications |
| Date | 2015-03-03 |
| Paper # | EA2014-114,SIP2014-155,SP2014-177 |
| Volume (vol) | vol.114 |
| Number (no) | 473 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |