基于MATLAB的FIR數字濾波器設計

電子機電論文編號:JD280       論文字數:11261,頁數:32

目  錄
摘  要 I
ABSTRACT II
1  引　言 1
2  數字濾波器簡介 2
3  數字濾波器設計方法 5
3.1  數字濾波器設計的基本步驟 5
3.2  濾波器的MATLAB設計 6
4  FIR數字濾波器的MATLAB設計 8
4.1  窗函數設計FIR濾波器 8
4.2  頻率取樣法設計FIR濾波器 14
4.3  切比雪夫逼近法設計FIR濾波器 20
5  結  論 27
謝  辭 28
參考文獻 29

摘  要
數字濾波器是由數字乘法器、加法器和延時單元組成的一種裝置。其功能是對輸入離散信號的數字代碼進行運算處理，以達到改變信號頻譜的目的。由于電子計算機技術和大規模集成電路的發展，數字濾波器已可用計算機軟件實現，也可用大規模集成數字硬件實時實現。本文針對在實際設計中要大量應用數字濾波器這一現實，對數字濾波器的基本理論、性能特點、設計方法進行了全面的分析，特別是對有限沖擊響應數字濾波器(FIR)的設計進行了深入的探討。介紹了濾波器的定義、分類、濾波器的設計和實現方法。在設計方法中介紹了數字濾波器設計的基本步驟和MATLAB設計。主要研究了FIR數字濾波器的設計原理及常用的三種設計方法:窗函數法、頻率抽樣法、切比雪夫逼近法，并通過具體實例進行仿真分析。
關鍵詞:濾波器設計；紋波；過渡帶

ABSTRACT
Digital wave filter is a kind of installation that forms by digital multiplier, adder and the unit of delay time. Its function is to carry out operational handling for inputting the digital code of dispersed signal in order to reach the purpose that changes signal frequency spectra. Because of the development of the computer technical circuit of large scale integration digital wave filter can already realize with computer software, can also realize with the digital hardware real time of large scale integration. Digital wave filter is a dispersed time system. As digital filters, in particular FIR filters, are widely used in modern designs, this dissertation comprehensively anglicized fir’s basic theory, characters and design methodologies. It is introduce the digital filter’s definition, classification and the designed method of the filter. The designed method of the digital filter introduced the basic step and designed with the MATLAB. In the thesis, the design theory and three usual design ways of FIR digital filter are studied. They are window functions; frequency sampling technique and chebyshev equal ripple approach designs. Analyze experimental results by some material examples.
Keywords:  Design of Digital Filter; Contradiction of Ripple; Transition Band