Acoustics Research Centre, University of Salford, Salford, Greater Manchester M5 4WT, United Kingdom.
J Acoust Soc Am. 2011 Feb;129(2):717-25. doi: 10.1121/1.3531933.
This paper describes an active sound control methodology based on difference potentials. The main feature of this methodology is its ability to automatically preserve "wanted" sound within a domain while cancelling "unwanted" noise from outside the domain. This method of preservation of the wanted sounds by active shielding control is demonstrated with various broadband and realistic sound sources such as human voice and music in multiple domains in a one-dimensional enclosure. Unlike many other conventional active control methods, the proposed approach does not require the explicit characterization of the wanted sound to be preserved. The controls are designed based on the measurements of the total field on the boundaries of the shielded domain only, which is allowed to be multiply connected. The method is tested in a variety of experimental cases. The typical attenuation of the unwanted noise is found to be about 20 dB over a large area of the shielded domain and the original wanted sound field is preserved with errors of around 1 dB and below through a broad frequency range up to 1 kHz.
本文描述了一种基于差分势的有源声控方法。该方法的主要特点是能够自动在域内保留“期望”声音，同时从域外消除“不期望”噪声。这种通过主动屏蔽控制来保留期望声音的方法在一维封闭空间中的多个域中展示了各种宽带和现实声源，如人声和音乐。与许多其他传统的主动控制方法不同，所提出的方法不需要明确地对要保留的期望声音进行特征描述。控制是基于仅对屏蔽域边界的总场进行测量来设计的，屏蔽域可以是多连通的。该方法在各种实验情况下进行了测试。发现不期望噪声的典型衰减在屏蔽域的大面积区域内约为 20dB，并且通过高达 1kHz 的宽频率范围，原始期望声场的误差保持在 1dB 以下。
