放物面と点音源を用いた指向性スピーカに関する研究

抄録

This paper describes a new loudspeaker using a paraboloid and a point sound source. The purpose of this study is to generate linear sound space. Most of the sound wave from the focus of the paraboloid is reflected by the paraboloid surface, and the reflected sound wave becomes a plane wave. In this study, the reflected sound wave is regarded as an imaginary large piston that is located at the end of the paraboloid. The rest of the sound wave that is not reflected by the paraboloid becomes spherical wave. The acoustic filed is given as the sum of these acoustic fields. In this study, we propose a new point sound source device that has a flat frequency characteristic. The acoustic field is theoretically analyzed, and the effectiveness of the proposed method and theoretical analysis was verified through simulations and experiments.