Verification of Inverse Image Source Method Applied for Acoustic Field Creation in Open Area |
| A. Gołaś, K. Suder-Dębska, W. Ciesielka and R. Filipek
Department of Power Engineering and Environmental Protection, AGH - University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland |
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| The paper presents an original method for sound reinforcement in open areas. The method enabled both a regular sound reinforcement and the required spatial impressions of sound to be achieved in the area used for the study. The inverse image source method was used for the disposition of sound sources in order to find the inverse problem solution for determining the configuration of additional sound sources. Simulations demonstrated the improvement of sound impressions in the area in question and the simulations results were verified experimentally. The intended result of the proposed method was the increase of the lateral energy fraction and lateral energy fraction coefficient parameter values by 6 and 8 points, respectively, for the simulation by 5 and 7 points for the experiment. It should be stated that, in both the simulation and the experiment, eligible values for the acoustic parameters were obtained after using the sound system with additional sound sources, the speech intelligibility value parameters remain at an excellent level. In conclusion, it may be claimed that the proposed sound reinforcement system makes the creation of the intended spatial sound impressions in an open area possible. |
| DOI: 10.12693/APhysPolA.119.966 PACS numbers: 43.55.-n, 43.55.+p, 43.55.Ka, 43.55.Jz, 43.58.Ta |