Directivity Controllable Parametric Loudspeaker using Array Control System with High Speed 1-bit Signal Processing
Directivity Controllable Parametric Loudspeaker using Array Control System with High Speed 1-bit Signal Processing
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发表时间：
2012
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通讯作者：
S. Takeoka
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作者：
S. Takeoka
参数扬声器由于其超声波载波而具有非常尖锐的方向性。由于这种方向性，参量扬声器提供了杰出的音频应用。本文介绍了一种用高速1位信号处理技术分别驱动换能器的参量扬声器阵列信号处理方法。本文介绍了由576个独立控制的超声换能器组成的参量阵，并进行了指向性控制和多波束输出实验。通过同时使用1位信号作为驱动信号，可以实现信号分配和相位控制，而无需转换或重新计算。从硬件和软件两个方面使系统的构建更加容易，从而使该扬声器的使用范围得到扩展。
Parametric loudspeakers are known for a very sharp directivity due to their ultrasonic carrier wave. Because of this directivity, parametric speakers provide for distinguished audio applications. In this paper, an array signal processing method for parametric loudspeaker by driving transducers individually with high-speed 1-bit signal processing is introduced. We present our parametric array consisting of 576 ultrasonic transducers controlled individually, and experiments of directivity control and multi beams output are shown. By using 1-bit signal as driving signal concurrently, the signal assignments and phase control can be realized without converting or recalculations. It makes construction of the system easier in both sides of hardware and software, and the use of this speaker will be extended.