数据采集中滤波问题的探讨

在数据采集系统中,低通滤波器常被用作抗混叠滤波器,以滤除或衰减高频噪声的影响。由于无源滤波器频率特性较差,在精度要求高的应用中多采用有源滤波器。文章详细讨论了两种常用的有源低通滤波器的频率特性,给出了它们各自的应用实例及详细的对比分析。

Discussion on Filtering Problem in Data Acquisition

In data acquisition system,a low-pass filter is frequently used as an anti-aliasing filter to filter out or to attenuate high-frequency noise. Because of the poor frequency characteristics of passive filters,active filters are often adopted in the application with high accuracy demand. The frequency characteristics of two common active low-pass filters are discussed in detail,and their application examples as well as the detailed contrastive analysis are offered.