消除50Hz工频干扰数字滤波器的设计

Design of Digital Filter of Cancelling 50HZ Noise

目的:设计一带阻滤波器,以消除信号处理中的工频干扰。方法:利用程序设计法和FDATool设计法进行设计。结果:利用一混和正弦信号进行测试,该滤波器可以很好地消除50Hz的工频干扰。结论:该设计方法除了可以消除工频干扰之外,只需要做简单的程序修改就可以消除任意一种频率的干扰信号。

Objective To design a bandstop digital filter for cancelling the 50HZ noise. Methods Procedure and FDATool method were used in processing. Results The filter was tested by a blended sine wave, the experimental result showed that the filter could cancel the 50HZ noise. Conclusion This filter may eliminate a random noise except the 50HZ noise by modifying the procedure simply.[Chinese Medical Equipment Journal,2008,29（12） ：25-27]