DLPF幅频特性要求(通带截止频率ωp=0.5π,通带最大衰减αp=0.5 dB,阻带截止频率ωs=0.6π,阻带最小衰减αs=50 dB)取得DLPF的X(K);%wp=0.2pi,ws=0.3pi,Rp=0.25dB,As=50dB%T1=0.5925,T2=0.1099M=60;alpha=(M-1)/2;l=0:M-1;wl=(2*pi/M)*l;Hrs=[ones(1,7),0.5925,0.11,zeros(1,43),0.11,0.5925,ones(1,6)];Hdr=[1,1,0,0];wdl=[0,0.2,0.3,1];