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• W1979380337 abstract "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." @default.
• W1979380337 created "2016-06-24" @default.
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• W1979380337 date "2010-06-01" @default.
• W1979380337 modified "2023-10-07" @default.
• W1979380337 title "Active noise control using a steerable parametric array loudspeaker" @default.
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• W1979380337 doi "https://doi.org/10.1121/1.3409483" @default.
• W1979380337 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20550253" @default.
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