图像在“信号与线性系统”中的妙用

The Application of Images in the Course of Signals and Systems

"信号与线性系统"课程中信号的频谱分析是重点,也是学生学习的难点。本文首先利用一维信号说明信号时域波形与频谱中频率分量的对应关系;然后利用二维图像进一步验证。对比一维信号和二维图像的说明方法,可以明显地看到后者更加直观形象,也更利于学生理解频谱的概念。实践证明利用二维图像可以达到更好的教学效果。

The spectrum analysis is one of the most important parts for Signals and System, which is one of the difficult parts for students . In this paper , one - dimensional signals are used to summarize the relationship of signal between time and spectrum domain; then two-dimensional images are used to verity it. By comparisons, it is obvious that the method using two-dimensional image is more vivid and more helpful for students to understand the concept of the spectrum. The good effect with two-dimensional images is proved.