基于声卡和LabVIEW的虚拟仪器设计与实现

为了在对采样频率要求不高的情况下进行信号的生成和分析,采用声卡取代价格昂贵的数据采集卡进行采样和输出,利用虚拟仪器开发软件LabVIEW,分别设计和实现了基于声卡的虚拟信号发生器和虚拟示波器。信号发生器可以产生方波、三角波等常用波形和自定义波形,示波器具有波形显示、图像暂停和截取以及频谱分析功能,所设计的虚拟仪器具有友好的人机界面,只需两台计算机即可进行完整的自测试

Design and implementation of virtual instrument based on sound card and LabVIEW

In order to perform signal generating and analyzing in situations where the requirement for sampling rate is not so high, the sound card which substitutes for high-cost data acquisition card is adopted for sampling and signal output, Based on the virtual instrument developing software LabVIEW, a virtual signal generator and a virtual oscilloscope are designed and implemented respectively. The signal generator can generate square waveform, triangle waveform and other user-defined waveforms. The oscilloscope has the function of waveform display, image clip and spectrum analyzing. The virtual instruments designed have user friendly interface and can perform complete self-test with only two computers.