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【简答题】
Oppenheim's book, p57, 1.3 [from now on we shall write O1.3 for short. ] Determine the values of power and energy for each of the following signals: (a)x_1(t)=e^{-2t}u(t) (b)x_2(t)=e^{j(2t+pi/4)} (d) x_1[n]=0.5^n*u[n] (e)x_2[n]=e^{j(pi/(2n)+pi/8)} Note: 从作业2开始,请各位把作业手写做在作业本上上交,要求抄题目,画图用铅笔和直尺. 作业评分的依据是要有清晰的和必要的解题过程(这意味着我的助教不会批阅你们写在自己草稿纸上的内容),依照过程给分,与期末考试评分类似. 作业中直接给出结果而不出现过程者,统一理解为抄袭,不给分. Please familiarise yourself with the plain text typing style, sort of LaTeX type. See also the attached picture to illustrate what they mean exactly. [这2可以不用抄写到作业本]
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