基于MATLAB的语言信号加扰系统仿真(任务书,论文27000字)
摘 要
语音信号处理是一门新兴的涉及面很广的交叉学科。信号处理是Matlab重要应用的领域之一。
【关键词】:语音信号 滤波 MATLAB 仿真 加扰系统
ABSTRACT
Speech signal processing is a new and very wide range of interdisciplinary, is one of the core technology of the application of many fields of information. This article will voice signal scientific research background and the present situation of the development at home and abroad and voice and a brief overview of the formation, the signal acquisition and processing, and by using the MATLAB voice signal in time domain and frequency domain analysis, and the voice are scrambling to deal with.
Speech signal processing is the study of digital signal processing technology and phonetics knowledge of speech signal processing of emerging disciplines, is the most rapid development of information science research in the field of one of the core technology. By voice message is the most important, the most effective, most commonly used and most convenient form of exchange of information.
Matlab language is a kind of data analysis and processing functions very powerful computer application software, it can sound file conversion into discrete data file, and then take advantage of its powerful matrix capable of handling the data, such as digital filter, the Fourier transform, the time domain and frequency domain analysis, audio playback and rendering of various kinds of figure, its signal processing and analysis toolbox for speech signal analysis provides abundant functions, these functions can be used to quickly and easily complete the speech signal processing and analysis and visualization of the signal, make the human-computer interaction more convenient. Matlab signal processing is one of important application areas.
For now, most of the content of speech processing software in this design, inconvenient operation and so on, using MATLAB7.0 comprehensive using GUI interface design, various function call to realize the voice signal frequency, amplitude, Fourier transform and filtering, program interface is concise, easy to operate, has a certain practical significance.
[keyword]: speech signal filtering MATLAB scrambling system simulation
目 录
摘 要 III
ABSTRACT IV
目 录 V
前言 VII
第一章 语音信号研究背景概述 1
第一节 研究背景 1
第二节 国内外研究现状 2
第三节 智能操控系统的基本功能特点 4
第四节 智能操控系统的特征 6
第二章 语言信号分析相关问题介绍 7
第一节 语音生成系统和语音感知系统 7
一、语音生成系统 7
二、语音感知系统 8
三、语音信号生成的产生模型 10
四、语音信号的时域波形 12
五、基音与四声 14
六、语音信号数字处理中的短时分析技术 14
第二节 语音信号预处理技术 14
一、语音信号的采样和量化 14
二、语音信号的预加重 15
三、语音信号的分帧和加窗处理 15
第三章 语音信号的加扰系统和时域与频域的分析 17
第一节 含噪语音的合成 17
第二节 反干扰系统 17
一、低频反干扰 18
二、高频反干扰 18
第三节 时域分析 19
一、短时能量分析 19
二、短时过零率分析 19
第四节 频域分析 20
第四章 基于MATLAB的语言信号加扰系统仿真 21
第一节 语音信号的仿真原理 21
第二节 语音信号的仿真实现 21
一、 语音信号采集子系统的设计 22
二、语音信号分析系统 24
三、系统的图形用户界面优化 26
第三节 语音信号处理基本知识 27
一、 语音的录入与打开 27
二、采样位数和采样频率 27
三、时域信号的FFT分析 28
四、 数字滤波器设计原理 28
五、倒谱的概念 30
结语 32
致 谢 34
参考文献 35