语音信号处理毕业设计论文

摘要

语音信号处理是研究用数字信号处理技术和语音学知识对语音信号进行处理的新兴的学科，是目前发展最为迅速的信息科学研究领域的核心技术之一。通过语音传递信息是人类最重要、最有效、最常用和最方便的交换信息形式。

Matlab语言是一种数据分析和处理功能十分强大的计算机应用软件，它可以将声音文件变换为离散的数据文件，然后利用其强大的矩阵运算能力处理数据，如数字滤波、傅里叶变换、时域和频域分析、声音回放以及各种图的呈现等，它的信号处理与分析工具箱为语音信号分析提供了十分丰富的功能函数，利用这些功能函数可以快捷而又方便地完成语音信号的处理和分析以及信号的可视化，使人机交互更加便捷。

本设计采用MATLAB7.0综合运用GUI界面设计、各种函数调用等来实现语音信号的变频、傅里叶变换及滤波，程序界面简练，操作简便。

关键字：Matlab；语音信号；傅里叶变换；信号处理

Abstract

Speech signal processing is to study the use of digital signal processing technology and knowledge of the voice signal voice processing of the emerging discipline is the fastest growing areas of information science one of the core technology. Transmission of information through the voice of humanity's most important, most effective, most popular and most convenient form of exchange of information..

Matlab language is a data analysis and processing functions are very powerful computer application software, sound files which can be transformed into discrete data files, then use its powerful ability to process the data matrix operations, such as digital filtering, Fourier transform, when domain and frequency domain analysis, sound playback and a variety of map rendering, and so on. Its signal processing and analysis toolkit for voice signal analysis provides a very rich feature function, use of these functions can be quick and convenient features complete voice signal processing and analysis and visualization of signals, makes computer interaction more convenient .

The design of voice-processing software for most of the content are numerous, easy to maneuver and so on, using MATLAB7.0 comprehensive use GUI interface design, various function calls to voice signals such as frequency, amplitude, Fourier transform and filtering, the program interface concise, simple, has some significance in practice.

Keywords: Matlab；V oice Signal；Fourier transform；Signal Processing

目录

绪论 (1)

1 系统的方案分析与总体设计 (4)

1.1设计目标 (4)

1.2总体设计 (4)

1.2.1 matlab简介 (4)

1.2.2 图形用户界面设计 (5)

1.2.3 总体设计方案 (5)

2 语音信号处理的基本知识 (8)

2.1语音信号的采样 (8)

2.2语音信号的分析 (10)

2.3数字滤波器 (11)

2.3.1 IIR数字滤波器 (11)

2.3.2 FIR数字滤波器 (12)

2.3.3 数字滤波的优缺点分析 (13)

3语音信号处理的实例分析 (14)

3.1语音信号的录入 (17)

3.2语音信号的提取 (17)

3.3语音信号的调整 (19)

3.3.1 语音信号的频率调整 (19)

3.3.2 语音信号的幅度调整 (19)

3.4语音信号的滤波 (21)

3.4.1 语音信号的低通滤波 (21)

3.4.2 语音信号的高通滤波 (22)

3.4.3 语音信号的带通滤波 (23)

3.4.4 语音信号的带阻滤波 (25)

3.5语音信号的输出 (26)

结论 (27)

致谢 (28)

参考文献 (29)

附录A 英文原文 (30)

附录B 汉语翻译 (45)

附录C 源程序 (56)