信号频域变换的教学方法思考

Reflections on the Teaching Method of Signal Frequency Domain Transform

从多年的教学工作当中发现很多学生在信号的变换域等抽象概念的理解方面有较大困难,对抽象概念理解非常模糊。由于概念抽象、学习进度快、相关理论知识覆盖面广,大部分学生很难从大量资料中系统地理解相关概念。而且大部分教材和参考文献过分注重概念及数学公式的普遍性和通用性以及解题技巧上,在理论联系实际及应用过程的详解甚少,导致学生越学越吃力,通用公式联系不到各种不同的实际应用场合等情况。因此,有必要针对基本抽象概念的实例讲解来解释信息处理中核心概念,即信号的变换域。

A reality we found from teaching experience is that students have great difficulties understanding abstract concepts or the concepts are very unclear in their mind. Many students have difficulties in systematically grasping the concepts from vast learning materials due to the abstract concepts,fast learning progress,and wide coverage of relevant theoretical knowledge. Moreover,most textbooks and references pay too much attention to the generality and universal applicability of mathematical formulas as well as exam skills. There are few detailed explanations of practical integration of theories,which cause accumulated difficulties for students in applying theories to solving real world problems. Therefore,it is necessary to explain the core concept of information processing,that is,the transform domain of signals,by illustrating the basic abstract concepts.