在常规的噪声测量中普遍采用声级计,传统的声级计一般是利用硬件计权网络实现对噪声信号的计权,利用硬件的滤波网络实现噪声的倍频程分析以及给出平均声级等｡设计了一种基于LabView的虚拟式声级计,介绍了该虚拟声级计的硬件结构､软件设计流程､频率计权和统计分析模块｡采用TES-1356音压校准器对所设计的系统进行了校准,通过和TES-1357精密声级计的比较实验,验证了所设计声级计的正确性,性能达到了Ⅰ型声级计指标｡所开发的多功能虚拟声级计程序模块化､灵活,很容易和其它设备集成,可应用于工业过程需要噪声或声级测量的众多场合｡ Design of Virtual Sound Level Meter in LabView CAO Guang-zhong,LUO Chang-geng (Department of Automation Science,College of Mechatronics and Control Engineering,Shenzhen University,Shenzhen 518060,China) Abstract:Conventional sound level meters generally use precision ceramic microphones and discrete solid state circuitry or integrated circuit operational amplifiers,and a set of standardized frequency weighting filters,standardized exponential time weighting circuits,logarithmic amplitude detector,and a display in decibels capable of measuring the RMS averaged sound level and other specifications.Described the design of a virtual sound level meter in labview.The developed meter or instrument consists of a microphone,preamplifier,an A/D card,and a computer with software LabView.The software design flow was presented.The weighting network module,statistic analysis were discussed in details.The meter was calibrated by using TES-1356 sound level calibrator and the correctness was verified by comparative experiment with TES-1357 exact sound level meter.The complete virtual instrument is capable of meeting the type 1,requirements of GB/T3785.The instrument has a modularity structure and could be easily used in conjunction with the device in any industrial application for noise or sound level measurements. Key words:virtual instrument; sound level meter;noise;calibration