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1、实验一序列的产生及绘图一、实验目的1．熟悉信号处理软件MATLAB的使用。2．离散信号的基本运算实现。3．了解基本序列及复杂序列的产生方法。4．运用卷积方法观察系统的时域特性。5．掌握线性时不变系统的频域表示方法。二、实验内容1．熟悉扩展函数2．运行例题程序3．编程实现下列内容（1）利用扩展函数产生序列并画图(a)-5<=n<=5(b)和0<=n<=50w(n)为白噪声函数为w=randn(size(n))（2）设线性移不变系统的抽样响应为输入序列为求系统输出y(n)并画图二、实验步骤例2产生序列并画图0
2、<=n<=20实验结果：x=Columns1through901.00002.00003.00004.00005.00006.00007.00008.0000Columns10through189.000010.00007.40825.48814.06573.01192.23131.65301.2246Columns19through210.90720.67210例3产生复信号-10<=n<=10并画出复序列的实部、虚部、幅值和相位离散图实验结果：x=Columns1through5-2.6911-0.3
3、836i-2.2237-1.0512i-1.6411-1.5033i-1.0166-1.7383i-0.4140-1.7745iColumns6through100.1166-1.6446i0.5406-1.3904i0.8391-1.0574i1.0081-0.6897i1.0558-0.3266iColumns11through151.00000.8644+0.2674i0.6757+0.4623i0.4605+0.5803i0.2429+0.6248iColumns16through200.0429
4、+0.6050i-0.1247+0.5345i-0.2507+0.4287i-0.3313+0.3035i-0.3676+0.1738iColumn21-0.3642+0.0519i作业：利用扩展函数产生序列并画图(1)-5<=n<=5程序：n=[-5:5];x=2*impseq(-2,-5,5)-impseq(4,-5,5);subplot(2,1,1);stem(n,x);xlabel('n');ylabel('x(n)');axis([-5,5,-3,3]);结果：x=000200000-10(2)
5、0<=n<=50程序：n=[0:50];x=cos(0.04*pi*n)subplot(2,1,1);stem(n,x);xlabel('n');ylabel('x(n)');axis([0,50,-2,2]);结果：x=Columns1through91.00000.99210.96860.92980.87630.80900.72900.63740.5358Columns10through180.42580.30900.18740.0628-0.0628-0.1874-0.3090-0.4258-0.5
6、358Columns19through27-0.6374-0.7290-0.8090-0.8763-0.9298-0.9686-0.9921-1.0000-0.9921Columns28through36-0.9686-0.9298-0.8763-0.8090-0.7290-0.6374-0.5358-0.4258-0.3090Columns37through45-0.1874-0.06280.06280.18740.30900.42580.53580.63740.7290Columns46through
7、510.80900.87630.92980.96860.99211.0000(3)0<=n<=50w(n)为白噪声函数为w=randn(size(n))程序：n=[0:50];x1=cos(0.04*pi*n);x2=0.2*randn(size(n));x=x1+x2;subplot(2,1,1);stem(n,x);xlabel('n');ylabel('y(n)');axis([0,50,-2,2]);结果：x=Columns1through80.88090.96220.88160.91391.18
8、330.68770.45950.7313Columns9through160.35510.43300.18350.29450.1734-0.1035-0.5982-0.2825Columns17through24-0.1072-0.3321-0.9535-0.7447-0.9453-1.0812-1.1766-0.9108Columns25through32-1.0780-0.9888-1.0657-1.0616-0.8556
