MatLAB语音采集和分析的程序设计
摘要关于语音信号处理的研究方向早已成为高科技应用领域和各行各业的研究热点，语音信号处理的技术从理论的研究到实际的应用已经几十年了并在各行各业都取得了长远的进步。它正在快速的与每一个拥有语言资讯与管理等各种实际应用的领域相接轨，如：金融、保安、商业、旅游、网络、游戏等许多行业。可以发现语音信号处理这门技术的研究将会是一项充满挑战性和实际意义的工作。42308
MATLAB将高性能的数值计算和可视化集成在一起，并提供了大量的内置函数，从而被广泛的应用于科学计算、控制系统和信息处理等领域的分析、仿真和设计工作。
本次毕业设计主要采用MATLAB软件对语音信号进行变频、变幅、傅里叶变换以及滤波来实现对语音信号的分析，把声波转变为我们能看见、能听见或能利用的形态。
毕业论文关键词：MATLAB；语音信号；信号处理；频谱分析；傅立叶变换;
Program design of speech acquisition and analysis based on MatLAB
Abstract
On speech signal processing research direction has become hotspot in the field of high-tech application fields and all walks of life, the speech signal processing technology from theoretical research to practical application has been around for decades the and have achieved further progress in all walks of life. It is fast and each has a variety of practical applications such as language information and management, such as: financial, security, business, tourism, network, games, and many other industries. It can be found that the research of speech signal processing technology will be a challenging and practical work.
Matlab high performance numerical computation and visualization are integrated together, and provides a large number of built-in functions, which is widely used in scientific calculation, control system and information processing and other areas of analysis, simulation and design work.
This graduation design mainly uses MATLAB software on the speech signal of frequency, amplitude, Fourier transform and filtering to achieve the analysis of speech signal, the sound change as we can see, hear or use the morphology.
Key words: MATLAB; speech signal; signal processing; spectrum analysis; Fu Liye transform
目录
1. 绪论 - 5 -
1.1选题的背景及意义 - 5 -
1.3未来发展趋势 - 7 -
2.课题的设计原理 - 9 -
2.1语音信号的采集 - 9 -
2.2语音信号的频谱分析 - 10 -
（1）语音信号的时域分析 - 10 -
（2）语音信号的频域分析 - 10 -
2.3语音信号的傅里叶变换 - 11 -
2.4给原始信号加一个高频噪声 - 13 -
2.5设计滤波器 - 13 -
3．课题的研究内容与所需的配置 - 14 -
2.1 研究内容 - 14 -
2.2 设计所需要的硬件与软件 - 14 -
MATLAB软件的简介 - 15 -
4.语音信号处理实现过程 - 16 -
1语音信号的处理分析 - 16 -
（1）语音信号的读取