本科毕业设计-基于labview的声音信号采集处理系统

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学号: 14110712912

毕业设计

题 目: 基于LABVIEW的声音信号采集处理系统

作 者 刘 根 届 别 2015

学 院 物理与电子学院 专 业 电子科学与技术

指导老师 周 峰 职 称 讲师

完成时间 2015.05 毕业设计

I

摘 要

LABVIEW虚拟仪器结合了图形化编程方式的高性能与灵活性以及专为测试、测量与自动化控制应用设计的高端性能与配置功能。并且为数据采集、仪器控制、测量分析与数据显示等各种应用提供必要的开发工具。

本文采用了一款图形化的编程工具LABVIEW,结合笔记本电脑自带的声卡,设计了一个基于LABVIEW的语音信号采集处理系统。在该系统中,通过设置声卡函数、谱分析函数以及输入输出端口就可以得到信号的滤波、频谱和功率谱等参数,并对声卡采集到的波形信号进行实时显示,最后通过SineGen声音信号发生器对该系统进行实验测试。

关键词:语音信号;声卡;信号分析;数据采集

毕业设计

II

Abstract

LABVIEW virtual instrument is a combination of graphical programming method of

high performance and flexibility, and specially designed for test, measurement and automation

control application of high performance and the configuration function. And for the analysis

of data acquisition, instrument control, measurement and data display a variety of applications

such as provide the necessary development tools.

This paper adopted a LABVIEW graphical programming tools, combined with the

notebook computer with sound card, designed a speech signal collection and processing

system based on LABVIEW. In the system, by setting the sound card function and spectrum

analysis function and input/output port can be parameters such as signal filtering, spectrum

and power spectrum, and the sound card to real-time display of waveform signal collected,

finally through SineGen voice signal generator to test the system.

Key words: speech signal; audio card; signal analysis; datacollection

毕业设计

III 目 录

第一章 绪 论 ........................................................................................................................... 1

1.1声音信号采集处理系统的研究目的和意义 ....................................................................... 1

1.2 声音信号采集处理系统的特点及应用 ............................................................................. 1

1.3国内外对本课题的研究 ................................................................................................... 2

1.4本论文研究的主要内容 ................................................................................................... 2

第二章 声音信号采集系统 ..................................................................................................... 4

2.1 声音信号采集系统结构 .................................................................................................. 4

2.1.1声音信号采集系统总体框图 ...................................................................................................... 4

2.1.2录音系统设计流程 ............................................................................................................. 4

2.1.3声卡设置流程 ..................................................................................................................... 4

2.2 声卡的介绍 ................................................................................................................. 5

2.2.1声卡的基本知识 ................................................................................................................. 5

2.2.2声卡的工作原理 ................................................................................................................. 6

2.3 LABVIEW的介绍 ...................................................................................................... 6

2.3.1LABVIEW的概述 .............................................................................................................. 6

2.3.2 LABVIEW的组成 ............................................................................................................. 7

第三章 基于LABVIEW的采集系统程序设计方案............................................................. 8

3.1 LABVIEW程序结构图 ................................................................................................................. 8

3.2 LABVIEW提供的关于声卡操作的函数 ..................................................................................... 8

3.3 LABVIEW程序模块组成 ............................................................................................................. 9

3.3.1编写波形显示 ..................................................................................................................... 9

3.3.2文件自动存储 ................................................................................................................... 11

3.3.3文件手动存储 ................................................................................................................... 11

3.3.4信号回放与分析 ............................................................................................................... 12

第四章 实验结果测试与分析 ............................................................................................... 13

4.1 声音信号采集系统 ...................................................................................................................... 13