Development of Environmental-adaptive Audio System UsingParametric Array Speaker

为了最大限度地降低参数扬声器的载声量，我们首先将倒相技术应用到扬声器中，在不影响参数声学特性的前提下，取得了很好的降低载频声压的效果。接下来我们重点介绍了一种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，使声音在更大的区域内定位，并改善声场再现以获得更逼真的感觉，我们使用双声道参数扬声器系统进行了声音定位测试。主要结果表明，声像局部化在靠近中心的区域内，且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.