摘 要：语音信号处理是研究用数字信号处理技术对语音信号进行处理的一门学科。语音信号处理的目的是得到某些参数以便高效传输或存储,或者是用于某种应用，如人工合成出语音、辨识出讲话者、识别出讲话内容、进行语音增强等。本文简要介绍了语音信号采集与分析以及语音信号的特征、采集与分析方法，并在采集语音信号后，在MATLAB软件平台上进行频谱分析,并对所采集的语音信号加入干扰噪声，对加入噪声的信号进行频谱分析，设计合适的滤波器滤除噪声，恢复原信号。利用MATLAB来读入（采集）语音信号，将它赋值给某一向量，再将该向量看作一个普通的信号，对其进行FFT变换实现频谱分析，再依据实际情况对它进行滤波，然后我们还可以通过sound命令来对语音信号进行回放，以便在听觉上来感受声音的变化。75403

毕业论文关键字：MATLAB，语音信号，信号处理，傅里叶变换

Abstract：Speech signal processing is the study of speech signal with digital signal processing technology for processing a discipline。 The purpose of the speech signal processing is to get some parameters in order to efficiently transport or storage, or used in some applications, such as synthetic speech, speaker identify and recognize the speech, speech enhancement and so on。 Speech signal acquisition and analysis are briefly introduced and the characteristics of speech signal, acquisition and analysis method, and after the acquisition speech signal, frequency spectrum analysis on MATLAB software platform, the collected in the speech signal to interference noise, to join the signal frequency spectrum analysis of noise, design a suitable filter filter out noise, restore the original signal。 Use MATLAB to read (acquisition) voice signal, will it assigned to a particular vector, then the vector as a normal signal, FFT transform to realize the frequency spectrum analysis, and then according to the actual situation to filter it, then we can also through sound commands to playback of speech signal, so that the auditory feel voice change。

Keywords: Matlab,Voice Signal,Signal Processing,Fourier transform

目   录

1  引言 5

1。1课题背景及意义 5

1。2国内外研究现状 5

1。3本课题的研究内容和方法 5

2  语音信号处理的总体方案 6

2。1 系统基本概述 6

2。2 系统基本要求 6

2。3 系统分析方法 7

2。4系统初步流程图 8

3  语音信号处理基本知识 8

3。1语音的录入与打开 8

3。2采样位数和采样频率 9

3。3时域信号的FFT分析 9

3。4数字滤波器设计原理 9

3。5倒谱的概念 10

4  语音信号处理实例分析 10

4。1图形用户界面设计 10

4。2信号的采集 11

4。3语音信号的处理设计 11

5  结论 17

参考文献 18

致  谢 19