Active noise control using a steerable parametric array loudspeaker.
Active noise control using a steerable parametric array loudspeaker.
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DOI：
10.1121/1.3409483
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发表时间：
2010-06
期刊：
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通讯作者：
N. Tanaka;Motoki Tanaka
中科院分区：
文献类型：
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作者：
N. Tanaka;Motoki Tanaka
可以说，主动噪声控制可以在指定控制点抑制声音，而目标位置以外的声压可能会增加。原因很清楚；控制源通常向全方向辐射声音。为了解决这个问题，本文介绍了一种参数阵列扬声器（PAL），它利用超声波作为载波的属性，产生空间聚焦的声束，从而可以抑制指定点的声压，而不会引起整个声场的溢出。首先概述了PAL 的基本特征。然后描述了由 PAL 源强度贡献的近场散射压力，这是设计有源噪声控制系统所需的。此外，推导了控制点声压最小化的最优控制律，并通过分析和实验研究了控制效果。为了跟踪运动目标点，提出了一种基于相控阵方案的可操纵PAL，从而无需机械旋转PAL就可以产生运动静区。最后进行了实验，验证了所提方法的有效性。
Arguably active noise control enables the sound suppression at the designated control points, while the sound pressure except the targeted locations is likely to augment. The reason is clear; a control source normally radiates the sound omnidirectionally. To cope with this problem, this paper introduces a parametric array loudspeaker (PAL) which produces a spatially focused sound beam due to the attribute of ultrasound used for carrier waves, thereby allowing one to suppress the sound pressure at the designated point without causing spillover in the whole sound field. First the fundamental characteristics of PAL are overviewed. The scattered pressure in the near field contributed by source strength of PAL is then described, which is needed for the design of an active noise control system. Furthermore, the optimal control law for minimizing the sound pressure at control points is derived, the control effect being investigated analytically and experimentally. With a view to tracking a moving target point, a steerable PAL based upon a phased array scheme is presented, with the result that the generation of a moving zone of quiet becomes possible without mechanically rotating the PAL. An experiment is finally conducted, demonstrating the validity of the proposed method.