Summary
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Strategies for an Acoustical-Hotspot Generation Yuan WEN Jun YANG Woon-Seng GAN Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Vol.E88-A No.7 pp.1739-1746 Publication Date: 2005/07/01 Online ISSN: DOI: 10.1093/ietfec/e88-a.7.1739 Print ISSN: 0916-8508 Type of Manuscript: Special Section PAPER (Special Section on Multi-channel Acoustic Signal Processing) Category: Sound Field Reproduction Keyword: sound field control, time-delay method, maximum-control-gain method, Full Text: PDF(1.2MB)>>
Summary: Two methods for hotspot generation using multiple sources, known as time-delay (TD) method and maximum-control-gain (MCG) method are investigated in the two typical acoustical fields, namely, the free field and a rectangular room. Based on the theoretical analysis and simulations, strategies are developed according to the sound field where the target region is defined. In the free field, the MCG method can be used if the performance in terms of control gain is the priority for an optimal control, whereas the TD method is more preferable if the simplicity of implementation is the first consideration. In a room environment, if a target region is defined in the near field where the direct sound dominates, the TD method is still effective. However, in the far field where the reverberant sound prevails, only the MCG method is applicable. The near field/far field can be roughly separated according to the critical distance from the sources in the room. | ||||||||||
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