一种快速跟踪带通滤波器的实现

Fast Tracking Band-Pass Filter

使用专用滤波芯片 MF10构成带通滤波电路 ,变速信号的频率通过单片机的测量、修正、倍频处理后输出作为 MF10时钟 ,以控制 MF10的带通中心频率 ,从而实现跟踪滤波。实验证明 ,对于 1Hz～ 5 0 Hz的变速信号 ,滤波效果很好 ,还可以通过改变单片机的晶振频率来调整滤波的频率范围。

The principle and method of the filter were indroduced.The MF10,a special chip for filtering purpose,formed the nucleus of the band pass filtering circuit.A single chip microcomputer was used to measure and multiplicate the frequency of tracked signal.By using the frequency multiplicated signal to control the clock of MF10,the tracking filtering was implemented.Experiment result shows that the effect of the filtering is very good at the range of frequency between 1Hz and 50Hz.The range of frequency can be expanded by changing the oscillating frequency of the microcomputer.