有关傅立叶变换和傅立叶系数求解的几个问题

Several Problems on How to Acquire FT and FS Correctly

针对学生作业中出现的错误，指出了几个在求解傅立叶变换和傅立叶系数时应注意的问题：何时及如何从极限的观点求信号的频谱、如何正确运用ＦＴ的微分、积分性质以及运算过程中积分与求和的次序问题，以期澄清学生思想中的错误观点。

In the light of the errors found in students' assignment,this paper presents three problems we should pay attention to so as to clear up students' misunderstanding. The first is when and how to acquire the spectrum of signals withan idea of limit. The second is how to use the differential property and integral property of FT correctly. The last is about the order of integral and sum in the process of calculation.