Study on Active Noise Control System Using Parametric Array Loudspeakers
Study on Active Noise Control System Using Parametric Array Loudspeakers
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发表时间：
2014
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通讯作者：
Kihiro Tanaka;Chuang Shi;Y. Kajikawa
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作者：
Kihiro Tanaka;Chuang Shi;Y. Kajikawa
在本文中，我们提出了一种使用参数阵列扬声器的主动噪声控制系统。使用普通扬声器作为控制源的传统主动噪声控制系统可能会导致目标点（安静区）外的声压级不必要的增加。此外，与单通道ANC系统相比，多通道ANC系统显著增加了计算复杂度。另一方面，由于pal具有超指向性特征，所提出的ANC系统不仅可以在期望位置降低不需要的噪声级，还可以抑制其他位置声压级的增加。如果所提出的ANC系统的不同信道之间的干扰最小化，则该ANC系统中的每个信道都可以独立控制。我们已经尝试将提出的系统应用于制造设备产生超过90分贝噪音的工厂。由于噪声源的分布和多径传播，传统的非噪声控制系统无法有效工作。此外，出于安全考虑，控制源的安装位置受到限制。基于这些原因，我们进行了对比实验，以确定在Case(1,2,2) ANC系统中安装PALs的最佳位置。本文介绍了拟议的ANC系统的最新成果，并讨论了仍存在的问题。
In this paper, we propose an active noise control (ANC) system using parametric array loudspeakers (PALs). Conventional active noise control systems using ordinary loudspeakers as control sources may result in unwanted increment of sound pressure levels outside the target points (quiet zones). Moreover, a multiple-channel ANC system increases the computational complexity signi cantly as compared to a single-channel ANC system. On the other hand, the proposed ANC system can not only reduce unwanted acoustic noise levels at the desired locations but also suppress the increment in sound pressure levels at other locations because the PALs have a super-directivity feature. If interferences between di erent channels of the proposed ANC system are minimized, therefore each channel in this ANC system can be controlled independently. We have attempted to apply the proposed system in a factory where manufacturing equipments generate noise levels of over 90 dB. Due to the distribution and multiple-path propagations of noise sources, conventional ANC system cannot work e ectively. In addition, the installation locations of the control sources are constrained for safety consideration. For these reasons, comparative experiments have been conducted to nd the optimized locations to install PALs in a Case(1,2,2) ANC system. Recent results of the proposed ANC system are presented and remaining issues are discussed in this paper.