DSP5

DSP5 - DSP ? ? ? ? 5092119015 ? ? x[n] = cos(0.1 n),0 n...

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DSP ? ? ? ? 5092119015 ? ? 画画画画 x [ n ] = cos(0.1 π n ),0 n < 40 画画画画画画画画画画画画画画画画画画画画画画画画画画画 (a) x1 [ n ] = x [2 n ]画 画b画 x2 [ n ] = x [4 n ]画(c) x3 [ n ] = x [8 n ]画 画画画 n=0:39; x=cos(0.1*pi*n); subplot(2,2,1); stem(n,x) dt=0.01; t=[0:dt:max(n)]; y=spline(n,x,t); hold on; plot(t,y, 'r '); x1=x(1:2:40); subplot(2,2,2); stem([0:19],x1)
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