Development of Environmental-adaptive Audio System UsingParametric Array Speaker

为了尽可能地降低参量声扬声器的载波超声，我们首先将相位反转技术应用到扬声器中，并在不恶化参量声声学特性的情况下获得了降低载波超声压力的良好结果。我们接下来集中在一个新的立体声音频系统的实现。为了实现一种新的立体声再现方法，使声音定位在更广泛的区域，并提高声场再现更高的真实感，我们进行了声音定位测试，使用双通道参量扬声器系统。主要结果表明，声像定位在靠近中心的区域，几乎不受优先效应的影响。

To reduce the carrier ultrasound of a parametric loudspeaker as much as possible, we first applied the phase-inversion technique to the loudspeaker and obtained good results on the reduction of carrier ultrasound pressures without deteriorating the acoustic characteristics of parametric sounds. We next focused on the realization of a new stereophonic audio system. To realize a new method of stereo reproduction that enables sound localization in a wider area and improves sound field reproduction for higher realistic sensation, we carried out sound localization tests using a two-channel parametric loudspeaker system. The main results show that sound images are localized in an area close to the center and are almost independent of the precedence effect.