毕业设计（论文）-基于LABVIEW和PC机声卡的测试系统.doc

基于LABVIEW和PC机声卡的虚拟测试系统
测控技术与仪器专业
[摘要] 针对传统测试系统所需仪器繁多、资金投入大、功能单一、灵活性较差的弱点,本文利用声卡DSP技术和LabVIEW技术,提出了一种基于声卡的数据采集与分析的廉价方案,具有实现简单、界面友好、性能稳定可靠等诸多优点,在LabVIEW环境中实现了音频信号的采集分析及数据存盘重载,并结合应用实例验证了该系统的可行性及有效性;而且该系统具有双通道、高保真、22KHz甚至44KHz的采样率,实现了音频信号的实时采集、实时存储、信号分析(时域分析和频域分析)等多种功能,可以推广到语音识别、环境噪声监测和实验室测量等多种领域,应用前景广阔。
[关键词] 声卡;数据采集;信号分析;LabVIEW
Virtual Test System Based on LabVIEW and PC Sound Card
Measurement , Control Technology & Instrument Major LI Xiao-fan
Abstract:The traditional vibration test system have many disadvantages,such as plenty of instruments,large investment,single function,less , Based on DSP technology and LabVIEW, this paper brings forward a low price solution of sound card based data acquisition and analysis system, with its advantages of easy implementation, friendly interface and steady performance. In the range of voice frequency,data saving and overloading is essful in LabVIEW .In addition,the feasibility and availability of this system are validated with an apphcation this system has the qualities of dual channel, high-fidelity, 22 KHz even 44KHz sampling rate, it realized the multiple functionof real-time audio signal acquisition, real-time storage, playback, signal analysis (time domain analysisand frequency domain analysis), etc. With broad application prospect, this solution can be extended to the field of speech recognition, ambient noise monitoring and laboratory measurement etc.
Key words:sound card;data acquisition;signal analysis;LabVIEW
目录

1 引言 1
选题背景及意义 1
虚拟仪器技术国内外研究状况 2
虚拟仪器发展综述 2
国外虚拟仪器研究现状 2
国内虚拟仪器和基于声卡的数采系统研究现状 3
LabVIEW的编程环境简介 4
labview简介 4
labview编程环境 5
2 声卡的简介 5
声卡的分类 5
声卡的结构 6
声卡的工作原理 6
声卡的性能指标 7
3 系统功能设计 8
硬件实现 8
软件设计 10
10
虚拟示波器的设计 11
声卡配置模块 12
数据采集模块 14
信号分析 16
滤波模块 18
4 进行数据采集前的试验准备 20
5 系统调试过程 22
结束语 23
参考文献 23
致谢 24
1 引言
选题背景及意义
目前市售的数据采集卡都包含了完整的数据