MATLAB命令窗口输入命令：Fs＝100；t = (0:100)/Fs; s = sin(2*pi*t*5)+sin(2*pi*t*15)+sin(2*pi*t*30);变量Fs、t、s显示workspace列表命令窗口键入Sptool弹Sptool主界面图3所示；点击菜单File/Import信号s导入并取名s！
