セカンダリーパスの影響削減によるLMS型アルゴリズムを用いた騒音のアクティブ制御の収束特性の改善

概要

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The convergence characteristics of the feedforward active noise control system with the filtered-x LMS or multiple error filtered-x LMS algorithm are degraded by the transfer functions from the secondary sources to the error sensors (secondary paths). The possible methods to improve the convergence characteristics of the active noise control system with the LMS algorithm by reducing the effect of the secondary paths are discussed in this paper. In the first method, an index in the case of multiple secondary sources and error sensors to evaluate are introduced whether their positions are good or not before performing the cancellation. In the second method in which the number of secondary sources is increased, it is shown that the LMS adaptive algorithm performs well. In the third method with the use of the inverse filters of the secondary paths, the adaptive LMS algorithm is formulated and it is shown from the result of with a simulation using a transfer function measured in a room with a reverberation time of 0.5s that this method is practically effective.
社団法人日本音響学会の論文