LabWindows/CVI平台下虚拟信号分析仪的设计

摘要

Aiming at the disadvantages of traditional single analyzers, e. g. , unitary function, uneasy to revise, and inconvenient to use, with LabWindows/CVI as the platform, the multi-function virtual signal analyzer has been researched and developed. In the design, the response processing of man machine interactive interface and signal acquisition and display are separated into two threads for running, thus the waiting time of user operation is shortened, and the system operating efficiency is enhanced. The signal analyzer offers multiple functions, including random signal generation, dual-channel signal acquisition, time domain analysis, spectral analysis, correlation function calculation, etc. The experimental tests show that the virtual signal analyzer fully realizes the basic functions, the results of signal analysis are correct, thus the feasibility and necessity of developing virtual instruments are illustrated.%针对目前传统信号分析仪功能单一、修改不易、使用不便等缺点，以LabWindows/CVI为平台，研究开发了一种多功能虚拟信号分析仪。设计时把人机交互界面的响应处理和信号采集与显示分开成两个线程运行，大大缩短用户操作的等待时间，提高了系统运行效率。该信号分析仪具备伪随机信号产生、双通道信号采集、时域分析、频谱分析、互相关函数计算等功能。实验测试表明，该虚拟信号分析仪基本功能完全实现，信号分析结果正确，说明了推广发展虚拟仪器的可行性和必要性。