基于LABVIEW的虚拟滤波器的设计与实现

Design and realization of virtual filters based on LABVIEW

虚拟实验作为传统实验的一个有益的补充,已成为当前研究的热点之一,虚拟滤波器就是应用范围比较广泛的一种虚拟仪器。针对建立虚拟实验平台的需求,设计了基于LABVIEW的虚拟滤波器,该虚拟滤波器是通过数据采集卡来采集外部信号,通过图形化语言编程来实现仪器的滤波、分析及显示功能。该虚拟滤波器主要信号采集、重置滤波器、幅值和电压测量、频域分析、时域分析及存储与显示等模块组成,与传统仪器相比有许多优点,如可以随时记录分析过程和结果、开发时间短、成本低廉,可以根据需要灵活的进行功能扩展等。实验证明,该虚拟滤波器滤波性能良好、运行快速、结果可靠,能够达到实验要求。

As helpful complementarities to traditional experiment,virtual experiment becomes to be a pop study in modern world.Virtual filters are widely used in virtual experiment.The design of virtual filters which is based on LABVIEW is introduced.It gets the external data from a data acquisition card,and realizes the function of filter and display through Graphical programming.The virtual filter contains six main modules,they are data acquisition,reset filters,amplitude and voltage measurement,frequency analysis,time analysis,storage and display modules.It has many advantages which traditional instruments are lack of,such as reserve the results,short development time,lower cost and extending function according to the need.The experiments indicate that this virtual filter has good wave filtering performance,reliable operation and achieved the desired results.