多通道前饋式主動式噪音控制使用Levinson格式演算法

Multichannel feedfrowad Active Noise Control by Levinson lattice algorithm

王瀅智(Ying-Jihi Wang)

指導教授 ： 胡竹生

國立交通大學/工學院/聲音與音樂創意科技碩士學位學程/碩士(2019年)

摘要

本論文呈現一個多通道filtered-x LMS演算法與Levinson格式演算法 的比較研究。多通道前饋式 ANC 系統被運作在一個有高度迴響的環境，以四個噪音源當作測試訊號且採取兩個不同的控制模式。此研究模擬皆由Matlab執行。研究結果顯示當多個控制喇叭及感測的使用可以達到全域的噪音控制。多通道 filtered x LMS演算法和Levinson演算法皆產生相似的靜音區。其頻率低於500Hz的靜音區大小已足夠滿足模擬情境(headrest)的需求。另外一方面，Levinson格式演算法在寬頻噪音的控制可達到較高的噪音衰減。然而，由於Levinson格式演算法不是適應性的方法，故不適用於複雜與不穩定的環境。

關鍵字

主動式噪音控制 ； 格式濾波器

並列摘要

The thesis presents a comparative study of multichannel Filtered x least mean square (MCFXLMS) and Levinson-based lattice algorithm. Two different control modes of the Multichannel feedforward ANC systems are considered in a highly reverberant environment with four noise sources as tested data. Simulations of the study were conducted by using Matlab. The results show that global noise control were achieved with multiple speakers and sensors used. According to the simulation results, MCFXLMS provides the same silent zones as the Levinson-based lattice algorithm, and both algorithms create larger enough silent zones to satisfy the requirements in the frequency below 500Hz. On the other hand, the Levinson-based lattice algorithm achieves higher average noise reduction, especially in broadband noise cases. Further, since the Levinson based lattice algorithm is not an adaptive one, so it is not suitable for complex and non-stationery conditions.

並列關鍵字

Active Noise Control ； lattice filter

參考文獻

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