滤波器结构设计：掌握 IIR 数字滤波器的直接I 型、II 型、级联型、并联型结构的特点和表示方法；滤波器结构设计：FIR数字滤波器的直接型、级联型、频率抽样型以及快速卷积的结构特点和表示方法；线性相位，FIR 滤波器的结构和特点；全通滤波器、梳状滤波器的特点和表示方法。-I type directly control IIR digital filter, type II, cascade, features a parallel-type structure and representation　Filter design: FIR digital filter direct type, cascade, the frequency of sampling and fast convolution type The structural features and representation　linear phase FIR filter structure and characteristics　all-pass filter characteristic comb filter and representation.