基于MATLAB的频率采样法设计FIR滤波器

Frequency Sampling Method for FIR Filter Design

在总结频率采样设计法的主要设计过程及其特定参数的设计范围给出过渡带采样值设计个数与目标阻带衰减值的关系基础上,利用MATLAB软件对1个FIR滤波器实例进行仿真设计,列出相关数据进行比对。结果表明,在采用频率采样法设计FIR滤波器时,适当选取过渡带采样点的采样值能在频率采样点数与过渡带频率采样点数选定的条件下得到阻带最小衰减的最大值。

Based on summarizing the main design process of the frequency sampling method design,the scope of designing the special parameter and illuminating the relationship between the designing number of sampling value of transition zone and attenuation calculation of objective stop-band,a simulation design of a FIR filter by MATLAB is invesgated.The relevant data are listed and compared.Simulation results show that using frequency sampling method in FIR filter design,the maximum value of minimum stop-band attenuation,in condition that the number of frequency sampling points and the transition zone sampling points is chosen,will be obtained by selecting the appropriate sampling value of transition zone sampling points.