【摘要】 工频干扰相对高速采集系统内的信号频段极窄,时域内工频陷波需要很好的衰减特性,传统IIR、FIR等时域方法设计需要非常高的阶数,软硬件实现较为困难。以高采样率地震电磁辐射脉冲观测系统为例,结合系统核心处理器TMS320C6416的特点,选择频域滤波算法,并对此算法加以改进,使之能够实现信号的完美重构并满足系统的实时性要求,理论证明该算法原理简单、耗时少,能够有效抑制地震电磁脉冲工频干扰,仿真结果也验证了该算法的有效性。更多还原

【Abstract】 With respect to high speed acquisition system,the band of power line interference is extreme narrow.In the design of power line interference filter with traditional IIR and FIR methods,there is a need of a high order filter of favorable attenuation characteristics,it is hard for hardware and software to realize.Considering the wide frequency bandwidth of seismic electromagnetic radiation pulse,high sampling rate in the observation system and the characteristic of TMS320C6416,an improved algorithm of frequency domain filtering is presented.This algorithm has the advantages of simple principle and less time consuming by theoretical proof and is helpful to realize the signal reconstruction perfectly.The simulation results have proved the effectiveness of the algorithm.更多还原