基于LabVIEW的虚拟音频分析仪设计

基于LabVIEW的虚拟音频分析仪设计(论文10000字)
摘要：21世纪是高度信息化的时代，也是一个竞争日益激烈的时代，各种新兴产业也迅速崛起，虚拟仪器产业也应运而生。传统仪器的开发基于硬件基础，所以仪器的开发周期相对较长，难以率先抢占仪器用户的市场。虚拟仪器这一概念的提出完美的解决了这个问题，而虚拟仪器是以软件为开发基础的，研发周期短。虚拟仪器由于结构、形式的多样性，因此其适用的领域也广泛，可以确定的是虚拟仪器技术会成为新世纪自动测试与电子测量技术重要的发展方向。
本论文以普通计算机声卡采集被测音频信号，在LabVIEW环境下设计一个虚拟音频信号分析仪，要求其采样精度高，采样频率适中。可以准确的采集到声卡频率范围之内的信号，对采集到的信号进行基本的信号分析、波形回放、示波器测量功能和频谱分析功能。由于其简单便捷的操作，使其能满足绝大多数用户的实际测量需求。系统的结构多样，具有良好的扩展性，可推广到语音识别，噪声检测等方面，有良好的发展前景。
关键词:LabVIEW，计算机声卡，虚拟频谱分析仪

The Design of Virtual Audio Analyzer Based on LabVIEW
Abstract:The 21st century is an era of high informatization, and it is also an era of increasingly fierce competition. All kinds of emerging industries are emerging rapidly, and the virtual instrument industry has emerged. The development of traditional instruments is based on the hardware foundation, so the development period of the instrument is relatively long and it is difficult to preempt the market of the instrument users. The concept of virtual instrument solves this problem perfectly, while the virtual instrument is based on software, and the research and development cycle is short. Virtual instrument is due to the diversity of structure, forms, therefore its applicable field widely, virtual instrument technology will become the new century can be determined automatically test and important development direction of electronic measurement technology.
In this paper, a virtual audio signal analyzer is designed in the LabVIEW environment to collect the audio-frequency signal, and it is required to have high sampling accuracy and moderate sampling frequency. It can accurately collect signals within the frequency range of the sound card, and perform basic signal analysis, waveform playback, oscilloscope measurement function and spectrum analysis function for the collected signals. Because of its simple and convenient operation, it can satisfy the actual measurement needs of most users. The structure of the system is diverse, with good expansibility, which can be extended to speech recognition, noise detection and other aspects, and has good development prospects.
Key words: LabVIEW,Computer sound card, Virtual spectrum analyzer.
 

目录
第1章  绪 论    5
1.1课题意义与背景    5
1.2国内外研究现状    6
1.2.1国外虚拟仪器研究现状    6
1.2.2国内虚拟仪器研究现状    6
第2章 虚拟仪器技术概述    7
2.1虚拟仪器简介    7
2.2虚拟仪器特点    7
2.3虚拟仪器控制系统的组成    8
2.4基于LabVIEW程序介绍    8
2.5基于LabVIEW的虚拟音频分析仪介绍    8
第3章  系统的信号采集     9
3.1声卡的背景      9
3.2声卡信号采集的实现     10
3.3 PC声卡配置    10
第4章  软件的设计及实现     11
4.1虚拟频谱分析仪的设计要求    11
4.2虚拟信号分析仪登陆软件设计     11
4.2.1用户登陆前面板设计    11
4.2.2用户登陆后面板设计    12
4.2.2.1用户信息判断程序    13
4.3音频信号采集分析前面板    14
4.3.1音频信号采集前面板设计    14
4.3.2音频信号分析和处理设计    15
4.3.2.1音频信号的回放与滤波    16
4.3.2.2音频信号的相位谱与幅度谱    16
4.3.2.2信号的幅度谱与相位谱    16
4.4音频信号处理后面板    17
4.4.1频谱测量    17
4.4.2巴特沃斯滤波    18
4.4.3快速傅里叶变换    19
4.5 信号分析模块    19
第五章系统联调    20
5.1登录界面调试    20
5.2音频分析调试    21
第六章 总结    22
参考文献    23
致谢    23