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滤波是通信、测试、数据采集和实时控制等领域至关重要的环节．通常的模拟滤波器，由于截止频率固定，在某些宽频率动态范围且有实时性要求的应用场合，往往达不到预期的滤波效果，有时甚至影响整个系统的正常运行。本文从有源滤波器的机理分析入手，提出了一种由单片机参与的滤波系统，它能自动跟踪输入信号频率，线性地选择合适的滤波器截止频率，弥补了原有滤波器的不足。
Filtering is a crucial part of communications, testing, data acquisition and real-time control. The typical analog filter, due to the fixed cut-off frequency, can not achieve the expected filtering effect in some applications with wide dynamic range and real-time requirements, and sometimes even affects the normal operation of the entire system. Starting from the mechanism analysis of the active filter, this paper presents a filter system with the participation of single chip microcomputer. It can automatically track the input signal frequency and select the appropriate filter cutoff frequency linearly to make up for the shortcomings of the original filter.