We present an audible sound source with omnidirectional patterns in the horizontal plane using facing ultrasonic transducer arrays driven at different frequencies. In this experiment, ultrasonic transducer arrays were placed face-to-face on a straight line. They radiated sound with different ultrasonic frequencies from each side. Through elementary examination, we realized directionality close to omnidirectional in the horizontal plane using ultrasonic transducer arrays arranged in a circular shape, which is rotationally symmetric in all degrees. In addition, using an acoustic camera, a sound source region was found to be generated between the arrays.

中文翻译：

---

使用不同频率驱动的面向超声换能器阵列开发全向可听声源

我们使用以不同频率驱动的面向超声换能器阵列在水平面上呈现具有全向模式的可听声源。在该实验中，超声换能器阵列面对面放置在一条直线上。它们从每一侧以不同的超声波频率辐射声音。通过初步检查，我们使用圆形排列的超声换能器阵列实现了在水平面上接近全向的方向性，该阵列在各个角度上都是旋转对称的。此外，使用声学相机，发现阵列之间产生了声源区域。