说明：  介绍基于图形化编程语言 LabVIEW 所设计的虚拟频谱分析仪。整个系统由虚拟信号发生器模块和频谱分析模块两部分组成。
(Introduced based on the LabVIEW graphical programming language designed by a virtual spectrum analyzer. The entire system is a virtual signal generator and spectrum analysis module module composed of two parts.)