FIR低通和带通滤波器的关系分析与仿真

为了避开直接设计带通滤波器的繁琐设计步骤要求,利用低通滤波器与带通滤波器的关系,间接设计带通滤波器是创新之处,即通过设计简单的低通滤波器从而达到设计带通滤波器的要求。介绍了窗函数法FIR数字低通、带通滤波器的设计,给出了低通滤波器与带通滤波器的频率响应函数,并分析了它们之间的关系,得出了相关结论,结合实例,利用Matlab证实了该结论的正确性,为带通滤波器的设计提供了一种新方法。

Analysis and Simulation of Lowpass and Bandpass FIR Digital Filter

In order to avoid the cumbersome design,the bandpass filter is indierect designed by relationship between it and lowpass filter.The design of lowpass and bandpass FIR digital filter based on window-function method is introduced,and frequency response of lowpass filter and bandpass filter are given,simultaneously,the relation between lowpass and bandpass filter is analysed and conclusion is drawn.In order to testify this conclusion,Matlab is proved to be right.