?? p10_3.m
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% Program P10_3% Effect of Up-sampling in the Frequency Domain% Use fir2 to create a bandlimited input sequencefreq = [0 0.45 0.5 1];mag = [0 1 0 0];x = fir2(99, freq, mag);% Evaluate and plot the input spectrum[Xz, w] = freqz(x, 1, 512);subplot(2,1,1);plot(w/pi, abs(Xz)); axis([0 1 0 1]); gridxlabel('\omega/?? 快捷鍵說明
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