建置主動式噪音控制系統之安全帽

A Study of Active Noise Control System for Helmet

陳柏宗(Po-Tsung Chen)

指導教授 ： 涂世雄

中原大學/工學院/電機工程研究所/碩士(2011年)

https://doi.org/10.6840/CYCU.2011.00018

摘要

摘要
本技術報告目的為開發以DSP為基礎之安全帽主動控制展示模型，安裝2個揚聲器，分別做為噪音源與控制源，並使用麥克風作為誤差訊號偵測，同時，在本實作中組裝1個訊號放大器驅動控制揚聲器抵銷噪音。在本回饋控制系統中，控制器結合FIR數位濾波與Filter-X LMS 演算法執行噪音抵銷。研究中完成以TMS320VC33 DSK(DSP Starter Kit)為平台的主動控制，測試結果顯示對於200Hz-500Hz單頻音可達15dB至20dB以上之降噪效果。

關鍵字

FXLMS演算法 ； DSP ； TMS320VC33 ； FIR數位濾波器

並列摘要

Abstract
The purpose of this paper is to develop a DSP based active noise control to reduce Helmet noise, and accomplish an exhibition model. The study approach was to use a Helmet, and install two loud speakers, which were used as noise and control sources, while a market available noise meter was adopted as error detection. In the meanwhile, it is also necessary to assemble an amplifier to magnify the signal from control board to drive loudspeaker for noise cancellation in current practice. The integrated feedback control, in which the FIR digital filter of signal was combined with the controller of Filter-X LMS algorithm, was adopted to implement noise cancellation. A TMS320VC33 DSK(DSP Starter Kit) based controller for ANC was accomplished during this study, and the testing results indicated that a 15dB-20dB reduction was measured for tonal noise with application of FXLMS algorithm.

並列關鍵字

DSP ； TMS320VC33 ； Finite impulse response filter ； FXLMS algorithm

參考文獻

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參考文獻