中文说明：matlab可以说是一个非常有用且功能齐全的工具，在通信、自控、金融等方面有广泛的应用。对DTFT的主要理论基础及相关应用进行分析与处理，并用MATLAB做成了豪华界面。利用计算机作为平台，把DTFT中这些重要的应用更直观、更清晰明了地展现出来。通过计算机编程实现，我们更深刻地掌握了DTFT的理论基础以及用DTFT来分析实际应用中遇到的一.些信号与系统，并能对一些系统进行设计与辨识，
English Description：
Matlab can be said to be a very useful and fully functional tool, which is widely used in communication, automatic control, finance and other aspects. This paper analyzes and processes the main theoretical basis and related applications of DTFT, and makes a luxury interface with MATLAB. Using computer as a platform, these important applications in DTFT can be shown more intuitively and clearly. Through computer programming, we have a deeper understanding of the theoretical basis of DTFT and the use of DTFT to analyze some signals and systems encountered in practical applications, and can design and identify some systems,