周波数固定型近距離場スピーカの音場局所化性能の評価

抄録

A method to confine the acoustic pressure distribution near a loudspeaker array was proposed in the author’s earlier work. A potential application of the technology is personal audio. In principle, amplitude and phase of the individual loudspeakers are dependent on frequency. However, such frequency-dependent loudspeaker array would not be easy to implement. In this study, the frequency-independent loudspeaker array, which is easier to implement, is investigated. Because eigenvectors of the generalized radiation modes are weakly dependent on frequency, it can be expected that the frequency dependence of the loudspeakers’ amplitude and phase is negligible. It is shown in computer simulations that the frequency-independent loudspeaker array, which is designed at a fixed frequency, i.e., 300 Hz, successfully generates a confined acoustic filed between 300 Hz and 2700 Hz.