臺灣博碩士論文加值系統

在本文中，我們分析了模糊預測控制的方法並應用於主動消音的技術上。模糊預測控制的部份，主要是針對非線性失真的訊號作處理。除利用模糊控制法則來追蹤雜訊的軌跡，並加入預測的功能來預測雜訊下一步的大小。在訊號的處理中並包含波形振幅補償及頻率校正，讓我們得以產生一個與外界雜訊振幅及頻率相似的波形。主動消音的部份，我們整合電腦，介面，及外部電路成為一套聲波收放系統。經由本系統之軟硬體技術可得到與雜訊源振幅，頻率相同，但相位相反的波形，稱之為消音源。
在理想狀態下，把消音範圍限制在50∼400hz之間;讓雜訊源與消音源位置接近，且做同步輸出，將能使雜訊消除或降低，達到消音的目的。
排除無規律性及無法預測的高頻雜訊外，本研究之模糊預測控制之主動消音技術的功效及實用性，將可經由實驗解果得到進一步之證實。

In this paper, we investigate the method of fuzzy predictive control and its apply on active noise cancellation technique.
In the fuzzy predictive control, we focus on the process of nonlinear signal handling. We choose the fuzzy control to track the trajectory of nonlinear signal, and add the predictive control to predict the unknow signal. The signal processing includes the wave compensation and the frequency correction . Based on these techniques , we can generate a wave like the noise which we want to cancel. In the active noise cancellation, we integrate the computer, interface, and some microelectronic circuits to a system which can receive or emit sound wave. With the hardware and software techniques, we can get the same sound wave as the noise, but the phase of the sound wave is inverted. The sound wave is defined as the noise cancellation signal. That can be used to cancel the noise signal.
The effectiveness of the proposed method is supported by the experimental results, excluding those for the random and unpredictable high frequency noise.

中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
圖目錄 Ⅴ
表目錄 Ⅷ
第一章 緒論 1
1-1 前言 1
1-2 主要動機及目的 1
1-3 本文各章概論 3
第二章 聲波之原理及理論基礎 4
2-1 聲音的特性 4
2-2 聲音的補償 6
第三章 消音系統中控制法則的設計 13
3-1 主動消音的原理 13
3-2 聲源辨別與消音源之決定 14
3-3 控制法則的設計 20
3-3-1直接反相控制 20
3-3-2模糊預測控制法則 21
第四章 模糊預測控制法之主動消音系統架構與實驗模型及
硬體配備 37
4-1 系統架構簡介 37
4-2 基本原理 38
4-3 訊號轉換介面介紹 39
4-4 實驗配備 55
第五章 實驗結果與討論 56
5-1 直接反相控制法之模擬 56
5-2 模糊預測控制法之模擬 59
5-3 直接反相控制法之實驗結果 62
5-4 模糊預測控制法之實驗結果 66
5-5 討論 77
第六章 結論 79
參考文獻 80
致謝 82
附錄 83

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