基于MATLAB的语音倒谱分析

海南大学

毕业论文（设计）

题目：基于MATLAB的语音倒谱分析学号：

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完成日期：2012年6月

摘要

语言是人类最重要的交流工具，它自然方便、准确高效。随着社会的不断发展，各种各样的机器参与了人类的生产活动和社会活动，因此改善人与机器之间的关系，使人对机器的操纵更加便利就显得越来越重要。随着电子计算机和人工智能机器的广泛应用，人们发现，人和机器之间最好的通信方式是语言通信，而语音是语言的声学表现形式。要使机器听的懂人话，就要对语音信号进行处理。随着信息技术的不断发展，尤其是网络技术的日益普及和完善，语音信号处理技术正发挥着越来越重要的作用。为了寻找具有良好性能的特征及提取重要参数以提高识别系统性能，各种科学的算法应运而生，倒谱法作为信号处理的重要的方法之一，能够得到比较好的识别性能。

本文以MATLAB为平台，通过编程实现对语音信号的倒谱分析。首先，本文简要说明了倒谱与语音的相关理论原理，包括倒谱原理和语音的组成元素，为之后的进一步研究奠定理论基础。然后,对语音倒谱各个方面的应用进行了MATLAB编程，得到了语音基音检测和共振峰检测的实验仿真结果。

关键词：语音信号；倒谱；MATLAB；基音检测；共振峰检测；

Abstract

Language is one of the most important communication tools, it is convenient and efficient. With the continuous development of the society, a variety of machines are used in the human’s production and social activities, thus improving the relationship between man and machine makes the machine more convenient what becomes more and more important. With the wide application of electronic computers and artificial intelligence machine, it was discovered that language communication is the best means of communication between man and machine, while the voice is the acoustic manifestations of the language.To make the machine understands people, it is necessary to process the speech signal. With the continuous development of IT, especially the growing popularity of network technology and improvement of the voice signal processing technology is playing an increasingly important role, in order to find a good performance characteristics and extract important parameters to improve the performance of the recognition system, a variety of scientific algorithms have emerged, the cepstrum, as the signal processing one of the important methods, can get better recognition performance.

MATLAB as a platform, can achieve cepstrum analysis of the speech signal by programming. First, the article briefly described the itheoretical principles of cepstrum and voice, including the the cepstrum principles and elements of voice,which laied the theoretical foundation for the further research . Then the speech cepstrum application in all aspects was programmed in MATLAB, thus we got voice pitch detection , peak detection experiment simulation results by simulation.

Keywords: speech signal; cepstrum; MATLAB; pitch detection; resonance peak detection;

目录

1绪论 (1)

1.1目的及意义 (1)

1.2 语音信号研究现状 (1)

1.3主要研究内容 (3)

2倒谱的基本原理 (5)

2.1复倒谱和倒谱的定义 (5)

2.2复倒谱的计算方法 (6)

2.3复倒谱与倒谱的关系 (9)

3语音信号的组成分析 (11)

3.1语音的两个分量 (11)

3.2语音类型 (13)

4语音倒谱的应用及MATLAB仿真 (15)

4.1倒谱的MATLAB实现 (15)

4.2倒谱在同态信号处理系统的应用 (16)

4.3倒谱在基音检测方面的应用 (17)

4.4倒谱在共振峰检测方面的应用 (21)

5总结 (25)

致谢 (26)

参考文献 (27)

附录A (28)

附录B (28)

附录C (30)