基于单片机的非线性滤波器的设计与实现

在一些测控系统中，干扰信号会叠加到传感器和A／D变换器之间的模拟信号上，造成数码管显示测试结果时频繁变化，读数困难。对A／D变换器输出数据低通滤波，虽然可以稳定显示，但存在显示结果延时长和不能瞬间跳变的缺点。为此，本文用基于施密特原理的非线性滤波器抑制干扰，滤波由测控系统中的单片机完成。仿真和实际运行均表明，非线性滤波方法有效地滤除了干扰，数码管显示平稳，同时保留了该系统快速显示的能力。

Design and Realization of No-linear Filter Based On Single Chip Computer

In some control system, the interface signals is to be added to the analog signals between the ADC and the sensor,so the LED will be flickering,then it is difficult to catch the result which is been shown.As to the LPF,although it can stabilize the LED,it has two disadvantages,one is that it cannot refresh the LED quickly,and another is that the delay is long.So based on the theory of Schmitt trigger,the no-linear filter is designed,and it has been realized on the single chip computer.Both the simulation and the application show that the no-linear filter designed in this paper can filter the most of the noise,and then the LED has been stabilized,the LED can also be refreshed quickly.