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本文提出了三种消除数字地震信号中长周期随机干扰的方法：①多项式拟合模板法；②窄带低通滤波对消法：③自适应高通滤波法．用多级抽点技术可使滤波法的运算量大大减少，并可获得良好的滤波特性。最后对三种方法进行了讨论并给出了实验结果。
This paper presents three methods to eliminate long-period random interference in digital seismic signals: ① polynomial fitting template method; ② narrow-band low-pass filter to eliminate: ③ adaptive high-pass filtering method. Using multistage pumping technique can greatly reduce the computational complexity of the filtering method and obtain good filtering characteristics. Finally, the three methods are discussed and the experimental results are given.