摘要：在计算机科学技术高速发展的社会中，人们对于信号的处理技术以及相关应用越来越被关注，尤其语音方向最热。语音识别广泛通用于人机通信，通过人们常用的交互软件自带的语音聊天功能可以看出，它是辨析语音信号的一个重要的研究方向。汉语是由单音节声调组成的语言，汉语的声调常包含重要的语义信息，人们通过对基音频率的变化特性的分析，来对语音进行高正确率的辨认。

本课题对汉语声调的基音频率及特性进行辨识处理，重点提取如频谱和倒谱等特征参数。本文包含了重要参数的含义用途的详细介绍，对语音进行波形分析并绘制成图，提取频谱等重要参数，使用倒谱法用VC++语言写的一个提取基音频率的程序。通过对现存的语音库对比分析得到，汉语声调可分为以下四种：阴平、阳平、上声、去声，它们具有随基准音节的不同频率表现为不同发音的特性，并呈现一定的规律性。研究结果表明汉语声调受基音频率的改变而发生改变，基音频率升高，声调升高，反之亦然。

关键词  汉语声调  语音信号  倒谱  基音频率

毕业设计说明书外文摘要

Title   The analysis of  pitch  features of Chinese tones                          

Abstract：In computer science and technology in the rapid development of society, people for the signal processing technology and related application is more and more attention, especially the warmest voice direction. Speech recognition widely general in man-machine communication, people often used the interaction of the software by bringing the voice chat function, you can see that it is analysis of speech signal is an important research direction. Chinese is composed of a single syllable tone language, the tone of Chinese often contains important semantic information, people, through the analysis of the change characteristics of pitch frequency to high accuracy of speech recognition.

In this paper, the pitch frequency and characteristics of Chinese tones are identified, and the characteristic parameters such as spectrum and cepstrum are extracted. This article contains a detailed description of the meaning of the use of important parameters, the waveform analysis of the voice and draw into a figure, extract the spectrum and other important parameters, using the cepstrum method in vc++ language to write a program to extract the pitch frequency.Compared with the existing library analysis, Chinese four tones were Yin Ping, Yang Ping, Shangsheng and Qusheng,they have different pitch frequency variation, the results show that the Chinese tones are affected by the variation of the pitch frequency and tone rises as the pitch frequency increases.

Keywords  Chinese tone  Speech signal  Cepstrum  Pitch frequency

目   次

1 绪论1

 1.1 本课题研究的背景及意义1

 1.2 国内外研究现状1

1.3 总体技术方案及其社会影响3

 1.4 技术方案的经济因素分析3

 1.5 论文章节安排3

2 语音信号处理的基础知识4

 2.1 语音信号的波形特性4

 2.2 语音的分类5

 2.3 汉语语音的基本特性5

2.3.1 声母和韵母 6

       2.3.2 元音和辅音 6

       2.3.3 汉语的四声 7

3 语音信号分析9

 3.1 语音信号的预处理 9

 3.1.1 语音信号的预加重 9

3.1.2 语音信号的加窗处理9

 3.2 语音信号的频谱分析11

     3.2.1利用短时傅里叶变换求语音的短时谱11

3.2.2 语音信号的语谱图12

 3.3 语音信号的倒谱分析13

3.4 基于倒谱法提取基音频率13

4语音信号分析程序设计16