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在模拟信号采样过程中滤除信号中的干扰成份是必不可少的.目前已有一些完善的数学方法来处理,但这些方法通常很复杂,用于一般微处理器构成的实时采样系统有困难.在诸多信号变化较慢的采样系统中,如人体肌电采样(心电图、脑电图)、地振波记录,以50周工频电源干扰为最严重.本文就针对这种相对有用信号频谱而言频率较高的、单一频率的正弦波干扰,介绍一种简单而有效的滤波算法.
It is indispensable to filter out the interference components in the analog signal sampling process.At present, there are some perfect mathematical methods to deal with, but these methods are usually complicated, and it is difficult for real-time sampling system which is composed of general microprocessors In many sampling systems with slow signal changes, such as human EMG sampling (ECG, EEG) and ground wave recording, the power supply interference is the most serious at 50 weeks power frequency.This paper aims at this relatively useful signal spectrum In terms of a higher frequency, single-frequency sine wave interference, introduced a simple and effective filtering algorithm.