徐老师讲通倍原理 正常采样频谱 1.5 1 0.5 0 g000a090a000a0000a000Q00nm6 6nme00ea900a000a00a0009090p -0.1 -0.05 0 0.05 0.1 0.15 0.02 0.015 0.01 0.005 500 -400-300-200-1000 100 200 300400 500
正常采样频谱
徐老师讲通信原理 2t2=[-to/2:ts2:t0/2]; 2x2=sin(200*t2); 正常采样程序 2 m2=x2.1(200*t2); 2w2=t0/(2*ts2)+1; 2m2(w2)=1; 2m2=m2.*m2; 2 [M2,mn2,df2]=fftseq(m2,ts2,df); 2M2=M2/fs2; 2N2=[M2,M2,M2,M2,M2,M2,M2,M2,M2,M2,M2,M2,M2]; 2 f2=[-7*df2*length(mn2):df2:6*df2*length(mn2)-df2]-fs2/2; 2 figure; 2 subplot(2,1,1)月 2 stem(t2,m2); 2axis([-0.15,0.15,-0.3,1.5])月 2 subplot(2,1,2); 2 plot(f2,abs(fftshift(N2))); 2axis([-500,500,0,0.02])月
t2=[-t0/2:ts2:t0/2]; x2=sin(200*t2); m2=x2./(200*t2); w2=t0/(2*ts2)+1; m2(w2)=1; m2=m2.*m2; [M2,mn2,df2]=fftseq(m2,ts2,df); M2=M2/fs2; N2=[M2,M2,M2,M2,M2,M2,M2,M2,M2,M2,M2,M2,M2]; f2=[-7*df2*length(mn2):df2:6*df2*length(mn2)-df2]-fs2/2; figure; subplot(2,1,1); stem(t2,m2); axis([-0.15,0.15,-0.3,1.5]); subplot(2,1,2); plot(f2,abs(fftshift(N2))); axis([-500,500,0,0.02]); 正常采样程序