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数字信号实验(Digital signal experiment).doc

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数字信号实验(Digital signal experiment)

数字信号实验(Digital signal experiment) % plotted the amplitude frequency characteristic of 8 point DFT Title ((1a) 8 DFT[x_1 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X1k8))] Subplot (2,2,3); mstem (X1k16);%; plot the amplitude frequency characteristic of the 16 point DFT Title ((1b) 16 DFT[x_1 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X1k16))] Figure (2) Subplot (2,2,1); mstem (X2k8);%; plot the amplitude frequency characteristic of the 8 point DFT Title ((2a) 8 DFT[x_2 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X2k8))] Subplot (2,2,2); mstem (X2k16);%; plot the amplitude frequency characteristic of the 16 point DFT Title ((2b) 16 DFT[x_2 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X2k16))] Subplot (2,2,3); mstem (X3k8);%; plot the amplitude frequency characteristic of the 8 point DFT Title ((3a) 8 DFT[x_3 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X3k8))] Subplot (2,2,4); mstem (X3k16);%; plot the amplitude frequency characteristic of the 16 point DFT Title ((3b) 16 DFT[x_3 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X3k16))] % experiment content (2) periodic sequence spectrum analysis ================================== N=8; n=0:N-1;%FFT transform interval N=8 X4n=cos (pi*n/4); X5n=cos (pi*n/4) +cos (pi*n/8); X4k8=fft (x4n);% calculates the 8 point x4n of DFT X5k8=fft (x5n);% calculates the 8 point x5n of DFT N=16; n=0:N-1;%FFT transform interval N=16 X4n=cos (pi*n/4); X5n=cos (pi*n/4) +cos (pi*n/8); X4k16=fft (x4n);% calculates the 16 point x4n of DFT X5k16=fft (x5n);% calculates the 16 point x5n of DFT Figure (3) Subplot (2,2,1); mstem (X4k8);%; plot the amplitude frequency characteristic of the 8 point DFT Title ((4a) 8 DFT[x_4 (n) ); xlabel (PI / Omega ); ylabel ( range ); Axis ([0,2,0,1.2*max (ABS (X4k8))] Subplot (2,2,3); mstem (X4k16);%; plot the amplitude frequency characteristi

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