苗云龙毕设说明书.docVIP

2015届毕业生 毕业设计说明书 题 目: 基于MATLAB的语音信号处理 院系名称： 信息科学与工程 专业班级： 电信1105班 学生姓名： 苗云龙 学 号： 201116910524 指导教师： 乔丽红 教师职称： 副教授 2015 年 5 月 29 日  摘要 语言是人类社会最重要的交流交际的工具，由人们通过声带产生的各种表达符号构成。人们借助语言传递、保存、发扬和继承人类文明的成果。而语音，也就是语言的声音，作为整个符号语言系统的载体，传递出不同的语言所蕴含的信息。 本文中，用计算机本身自带程序软件采集一段录音，采用MATLAB7.1软件中丰富的工具箱函数，GUI的综合设计以及各种函数的调用对语音信号进行处理，包括对幅度，相位，频率的变化，对信号进行重新采样，观察采样率不同时信号的区别，对信号进行去噪处理，以及对动态随机信号进行傅里叶变换等等。并对处理前后的语音信号进行分析对比。 关键字：MATLAB;语音信号处理;傅里叶变换;FIR滤波器;窗函数 Abstract Language is the most important vehicle?of?communication of human socity and consisted of various of express symbol for people to communicate.People use language preservation, transfer, inherit and carry forward the achievements of human civilization.And voice, to the sound of the language, is the carrier of language symbol system, and transmit the information of different language.To pass information via voice is the most important information in the human society. So,the processing of speech signal is becoming an important technology. MATLAB is the matrix lab, it put the matrix computation, scientific research, engineering design, scientific data visualization and dynamic system of modeling and simulation functions togethor as concentrated in an easy to use a Windows environment, mainly used in engineering calculation, the control signal, signal processing and communications, image processing, signal detection, financial modeling design and analysis.In this article, it transmit sound file conversion into discrete data file, and then take advantage of its powerful matrix capable of handling data, MATLAB toolbox provided a lot of powerful function, has made it more convenient for the signal processing. In this paper, with the computer itself bringing a recording software acquisition, and use rich toolbox functions in the software, GUI design and