用窗函数法设计FIR数字滤波器

Design of FIR Digital Filter by Window Function Method

在研究目标物体的一些特征时,其时域的特性已不能满足研究需要,所以就需要研究该目标所发出信号的频域特征。笔者主要介绍用几种窗函数的特征并进行对比说明,以及利用窗函数法设计有限长脉冲响应数字滤波器的原理和方法,并且初步了解了各种窗函数对滤波特性的影响,并用设计的数字滤波器进行对比。

In the study of some characteristics of the target object,the characteristics of the time domain can not meet the needs of our research.Therefore,we need to study the frequency domain characteristics of the signal.The author mainly introduces the characteristics of several window functions.The principle and method of designing the finite length impulse response digital filter by using the window function method are studied.The influence of various window functions on the filter characteristics is also discussed.The digital filter is used to compare the design.