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在满足幅度特性的要求下,FIR系统可以保证严格的线性相位特性,合理设计滤波器各参数以逼近理想滤波器,从而满足设计性能指标。反之,在某种准则下设计滤波器各参数,可获取最优结果。这里借助MATLAB软件工具箱,采用三种不同的方法设计FIR数字滤波器,并进行对比。
In order to meet the requirements of amplitude characteristics, the FIR system can ensure strict linear phase characteristics, reasonably design the filter parameters to approximate the ideal filter to meet the design performance requirements. Conversely, under certain criteria, the parameters of the filter are designed to obtain the optimal result. Here with MATLAB software toolbox, using three different methods of designing FIR digital filters, and compared.