基于LabView的语音信号分析系统

学号：***********毕业设计(论文)

题目: 基于LabVIEW的语音信号分析系统的设计

作者贾邦稳届别2015 届

院别信息与通信工程学院专业电子信息工程

指导教师彭仕玉职称副教授

完成时间2015 年 5 月

摘要

虚拟仪器与传统仪器相比，实现了仪器的智能化、模块化、多样化等功能，体现出多功能、低成本等操作优点，应用前景广阔。随着计算机的出现及计算机技术的快速发展，语音信号处理技术更是得到了飞速发展，得到了广泛的应用，如语音合成技术、语音压缩编码和语音识别技术。

本设计利用虚拟仪器软件平台LabVIEW 设计了一个语音信号分析系统。先介绍了四种采集语音信号的方法，并选择采用录音机录制的方法采集语音信号，然后设计基于LabVIEW的时域信号的FFT分析模块，接着设计截止频率为3000Hz的Butterworth低通滤波器对语音信号进行滤波去噪，最后根据以上设计进行语音信号的时频分析、特性分析等。

关键词：虚拟仪器；LabVIEW；语音信号；时频分析；数字滤波器

Abstract

Compared with traditional instruments, virtual instruments achieve the intelligent, modularity, diversity and other functions of the instrument, and reflect the operating advantages, such as multi-purpose, low cost, etc. So it has broad application prospect. With the advent of computers and the rapid development of computer technology, speech signal processing technology has been develop rapidly, and used widely, such as speech synthesis technology, speech coding and speech recognition technology.

This design projects a speech signal analysis system based on the virtual instrument software platform LabVIEW. The first step is to introduce the methods of four kinds of voice signal acquisition, and select the method of recording voice signal by recorder . The second step is to design FFT analysis of time-domain signals which based on LabVIEW. Then design Butterworth low pass filter to realize the filtration of speech signals which cutoff frequency is 3000hz. Finally it is to achieve time-frequency analysis and characteristic analysis according to the the above designs.

Key words：Virtual instruments；LabVIEW；Speech signal；time-frequency analysis；digital filter.

目录

摘要......................................................................................................................................... I Abstract .................................................................................................................................... II 目录...................................................................................................................................... III 第1章绪论. (1)

1.1 虚拟仪器概述 (1)

1.2 语音信号处理的发展及应用 (2)

1.3 本课题研究任务及章节安排 (4)

第2章系统设计方案 (5)

2.1系统基本概述 (5)

2.2系统总体实现 (5)

2.3系统框图 (7)

第3章语音信号的采集 (8)

3.1 语音信号的采集方法 (8)

3.2 声卡的相关介绍及参数设置 (10)

3.2.1 LabVIEW中的相关声卡函数 (10)

3.2.2声卡的参数及设置 (11)

3.3 读取历史语音信号的设计 (14)

第4章基于LabVIEW的语音信号分析的实现 (15)

4.1语音信号的时域分析 (15)

4.1.1语音信号的预处理 (15)

4.1.2语音信号的短时能量和短时平均幅度函数 (17)

4.1.3语音信号的短时自相关函数和短时平均幅度差函数 (18)

4.2语音信号的频域分析 (18)

4.3滤波器的设计及滤波实现 (20)

4.4语音信号的综合实现 (23)

4.4.1语音分析系统的整体设计 (23)

4.4.2语音信号的时频分析 (24)

第5章总结 (25)

参考文献 (26)

致谢 (27)

附录 (28)