实验一离散时间信号的时域分析(4)

图4

4、产生长度为N且具有零均值和单位方差的正态分布的随机信号： 运行程序：

x=4*rand(1,100)-2 plot(x);

axis([0,100,-2,2]); title('扫频正弦信号'); xlabel('时间序号n'); ylabel('振幅'); grid;axis;

实验结果如图5所示：

扫频正弦信号

21.5

10.5

振幅

0-0.5-1-1.5-2

0102030

405060

时间序号n

708090100

图5

并产生如下所示序列：

x =

Columns 1 through 11

1.8005 -1.0754 0.4274 -0.0561 1.5652 1.0484 -0.1741 -1.9260 1.2856 -0.2212 0.4617 Columns 12 through 22

1.1677 1.6873 0.9528 -1.2949 -0.3772 1.7419 1.6676 -0.3589 1.5746 -1.7684 -0.5885 Columns 23 through 33

1.2527 -1.9606 -1.4444 -1.1889 -1.2051 0.4152 -0.9112 -1.2047 -1.9389 0.9871 -0.2196 Columns 34 through 44

1.7273 -0.1360 -0.3254 1.3849 0.1006 -1.1894 0.6885 1.3525 -1.9214 0.7251 -0.4821 Columns 45 through 55

1.3272 0.0113 0.8379 -0.2844 -0.7815 -1.2414 -1.2263 0.7289 -0.7889 0.1667 -1.3965 Columns 56 through 66