121 能動音響制御ユニット減音性能の向上(能動的音響制御)

概要

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In the paper, Fast Transversal Filter (FTP) and Eigenvalue Equalization LMS (EELMS) adaptive algorithm are introduced into feedback Active Noise Control (ANC) system to gain higher noise attenuation. A kind of active noise barrier, which uses Active Noise Control Units (ANCU) to create an acoustic soft edge boundary to reduce the diffracted noise, has been developed. In the ANCUs, feedback ANC system is used because of the simplicity of its hardware. However, conventional feedback LMS (FB-LMS) used as the adaptive algorithm in ANCUs cannot minimize the sound pressure well enough to create the soft edge boundary. To improve noise attenuation, FB-FTF and FB-EELMS are proposed. Simulation and experiment show that both FB-FTF and FB-EELMS perform better than FB-LMS. Moreover, the noise insulation performance of active noise barrier is calculated by Boundary Element Method (BEM) in the paper.
2011-06-29