基于MATLAB的数字滤波器设计.docx

第 PAGE 23 页 共 NUMPAGES 24 页 第 PAGE 24 页 共 NUMPAGES 24 页 基于MATLAB的数字滤波器设计 摘 要 MATLAB语言是一种广泛应用于工程计算及数值分析领域的新型高级语言,MATLAB功能强大、简单易学、编程效率高，深受广大科技工作者的欢迎。特别是MATLAB还具有信号分析工具箱，不需具备很强的编程能力，就可以很方便地进行信号分析、处理和设计。 信号的采集、处理、传输、显示和存储等有一个系统的体现，做了如下了的设计内容：录制或选取一段个人自己的语音信号，并对录制的信号进行采样；画出采样后语音信号的时域波形和频谱图；给定滤波器的性能指标，采用窗函数法和双线性变换设计滤波器，并画出滤波器的频率响应；然后用自己设计的滤波器对采集的信号进行滤波，画出滤波后信号的时域波形和频谱，并对滤波前后的信号进行对比，分析信号的变化；回放语音信号；最后，设计一个信号处理系统界面。 关键词：MATLAB，语音信号处理，滤波器设计 Abstract MATLAB language is a widely used in engineering calculation and numerical analysis domain new languages, and MATLAB powerful functions, easy to operate, programming, high efficiency, favored by the vast number of scientific and technical workers welcome. Especially MATLAB also has signal analysis toolbox, without the need to have strong ability of programming, it can be easily signal analysis, processing and design.In order to the student to the signal collection, processing and transmission, display and storage, etc have a system of mastery and understanding, meticulously arranged curriculum design of content: making a video personal own voice signal, and then the recording of signal sampling, Draw after speech signal sampling time domain waveform and spectrum diagrams, Given filter performance index, the window function method and bilinear transformation design filter, and draw the filter frequency response, Then use the design of your own filters to sampled signal for filter and draw the filtered signal waveform and spectrum, and time domain to filter the signal, compared before and after the analysis of signal changes, Playback speech signal, Finally, design a signal processing system interface. Keywords: MATLAB, the speech signal processing 目 录 TOC \o 1-3 \h \u 1.绪论 4 1.1 研究背景 4 1.2 研究的目的与意义 4 2 MATLAB简介 5 2.1.1Matlab的特点 5 2.1.2Matlab的功能 5 2.2滤波器 6 2.2.1滤波器 6 2.2.2滤波器原理 7 3. 滤波器的设计 8 3.1 FIR滤波器的设计 8 3.1.1 FIR滤波器的特点 8 3.1.2 窗函数发设计FIR滤波器 9 3.1.3 FIR低通滤波器 9 3.1.4 FI