Narrow-edged Beamforming Using Masked Parametric Array Loudspeakers
Narrow-edged Beamforming Using Masked Parametric Array Loudspeakers
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发表时间：
2021-12
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通讯作者：
Yuting Geng;Haonan Wang;M. Nakayama;T. Nishiura
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作者：
Yuting Geng;Haonan Wang;M. Nakayama;T. Nishiura
参数阵列扬声器利用超声波的直线性实现了优越的指向性。然而，在小尺度等离子体中，解调声束容易扩散。在本研究中，我们提出了一种基于掩模偏振方向的小尺度偏振方向波束形成方法。具体来说，整个参数阵列分为内部的主阵列和分裂的子阵列，主阵列两侧各有一半的子阵列。从主阵列发射正常调制波，而从子阵列发射相逆调制波。参数效应在空间上被掩盖，以增加解调声束的窄度。最后，通过实验验证了该方法的有效性。
Parametric array loudspeakers (PALs) can achieve superior directivity by using the straightness of ultrasonic waves. However, the demodulated sound beam in small-scale PALs has a tendency to spread easily. In this study, we propose a beamforming method for small-scale PALs using masked PALs. Specifically, the whole parametric array is divided into a main array on the interior and a split sub-array, with half of the sub-array on each side of the main array. A normal modulated wave is emitted from the main array, while a phase-inverse modulated wave is emitted from the sub-array. The parametric effect is masked spatially to increase the narrowness of the demodulated sound beam. Finally, we experimentally demonstrated the effectiveness of the proposed method.