发布时间 : 星期六 文章基于Matlab的语音信号传输系统的分析与仿真(D.L.K.5-14)更新完毕开始阅读
基于Matlab的语音信号传输系统的分析与仿真
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。信号处理是Matlab重要应用的领域之一。
本设计针对现在大部分语音处理软件内容繁多、操作不便等问题，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、变幅、傅里叶变换及滤波，程序界面简练，操作简便，具有一定的实际应用意义。
最后，本文对语音信号处理的进一步发展方向提出了自己的看法。
关键字：Matlab；语音信号；傅里叶变换；信号处理；
彭凯华：基于Matlab的语音信号传输系统的分析与仿真
The Design of Analysis and Processing Voice Signal
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 . Matlab Signal Processing is one of the important areas of application.
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.
Finally, the speech signal processing further development put forward their own views.
Keywords: Matlab，Voice Signal，Fourier transform，Signal Processing
彭凯华：基于Matlab的语音信号传输系统的分析与仿真
目 录
1 绪论 ................................................................................................................... 1
1.1课题背景及意义 ...................................................................................................... 1 1.2国内外研究现状 ...................................................................................................... 2 1.3本课题的研究内容和方法.................................................................................... 4
1.3.1 研究内容 ............................................................................................................ 4 1.3.2 运行环境 ............................................................................................................ 4 1.3.3 开发环境 ............................................................................................................ 4
2 语音信号处理的总体方案 ............................................................................... 5
2.1 系统基本概述 ........................................................................................................... 5
2.2 系统基本要求 ........................................................................................................... 5 2.3 系统框架及实现 ...................................................................................................... 8 2.4 系统初步流程图 ...................................................................................................... 9
3 语音信号处理基本知识 ................................................................................. 12
3.1语音的录入与打开................................................................................................ 12 3.2采样位数和采样频率 ........................................................................................... 12 3.3时域信号的FFT分析 .......................................................................................... 12 3.4数字滤波器设计原理 ........................................................................................... 13 3.5倒谱的概念 .............................................................................................................. 14
4 语音信号处理实例分析 ................................................................................. 16
4.1图形用户界面设计................................................................................................ 16 4.2信号的采集 .............................................................................................................. 16 4.3语音信号的处理设计 ........................................................................................... 16
4.3.1 语音信号的提取 ............................................................................................... 16 4.3.2 语音信号的调整 ............................................................................................... 18 4.3.2.1 语音信号的频率调整 ................................................................................ 18 4.3.2.2语音信号的振幅调整 ................................................................................. 19 4.3.3 语音信号的傅里叶变换 .................................................................................. 20 4.3.4 语音信号的滤波 ............................................................................................. 24 4.3.4.1 语音信号的低通滤波 .............................................................................. 24