中文摘要：

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。

英文摘要：

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 labvlew. 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.