主動式噪音控制系統之性能改良研究

Enhanced method to improve the performance of active noise control system

徐宏瑋(Hung-Wei Hsu)

指導教授 ： 張政元

中原大學/工學院/電機工程研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000415

摘要

摘要
主動式噪音控制為利用一人為產生的人工噪音去抵銷不想要的噪音，這種技術產生
一振幅相同、向位相差180 度的反噪音，對噪音進行聲波疊加的破壞性干涉。許多研究
人員採用傳統FXLMS 演算法做為設計ANC 系統的基礎，因為它運算簡單、易於實現，
但是次路徑轉移函數的變動對於FXLMS 的影響較少被討論到。
本文提出一新演算法，結合Filtered-X Adaptive Filtering with Averaging (FXAFA)與
Variable Step Size (VSS)兩種演算法，提供ANC 系統良好的強健性，特別是在次路徑轉
移函數發生改變時，而透過電腦MATLAB 的數值分析，其最後的模擬結果，有相當不
錯的表現。
關

關鍵字

FXLMS ； VSS ； 主動式噪音控制 ； 次路徑轉移函數

並列摘要

Abstract
Active noise control utilizes the artificial noise to cancel the undesired noise. This
technique generates the anti-noise signal with the same magnitude and 180∘phase shift to the
undesired noise, to destructively interfere the undesired noise. Many researchers have
employed the FXLMS algorithm to design the ANC system because of its simplicity.
However, the fluctuation of secondary path in FXLMS algorithm was less discussed in these
papers.
This paper proposes a novel filtered-X adaptive filtering with averaging (FXAFA)
algorithm for active noise control (ANC) system. A variable step size (VSS) method is also
presented. Combining both schemes, this paper controls an ANC system with good robustness
especially when the secondary path varied during the control process. Several computer
simulations results show the effectiveness.

並列關鍵字

Active Noise Control ； Secondary Path ； FXLMS ； VSS

參考文獻

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