摘要
线性相位滤波和最小相位滤波是数字地震观测中经常都要遇到的两类滤波器。现代地震数据采集器中就预置有这两种滤波系数供用户选用。本文以EDAS-C24地震数据采集器为例,通过比较两者滤波特性的差异后得出:为什么在以震相判读分析为主要用途的数字地震观测中必须选用最小相位滤波器,最好不要使用线性相位滤波器。同时还指出,最小相位滤波对优势频谱较高的地方微震波形影响较大,且振荡尾巴较长,分析研究时应注意其影响。
The linear and the minimum phase filters are two kinds of filter equipments used in the digital seismic observation.The modern digital equipment for seismic observation are installed these two kinds of filter system for user to choose from.Taking the EDAS-C24 digitizer as example,we compare the linear filter with the minimum phase one.In seismological application,to recognize the phase of seismic waves is an important task.So the minimum phase filter is sutible for the digital seismic observation.But to the wave of local earthquakes,the minmum phase filter affects the goodness of the special frequency and stretch the wave.The carefully recognize shall be paid.
出处
《四川地震》
2005年第2期1-5,共5页
Earthquake Research in Sichuan
