附实验报告、源码， 1.波形分析比较DFT和DTFT，2.比较不同窗函数对低通滤波器设计的影响 3.比较不同长度的窗函数对低通滤波器设计的影响，4.了解几种不同类型的窗函数并比较利用他们设计低通滤波器时的特点-Attached lab reports, source code analysis and comparison of waveform 1. DFT and DTFT, 2 affected significantly different window functions of the low-pass filter design 3. Impact of window functions to compare the length of the low-pass filter design, 4. Learn a few different types of window functions and compare them to take advantage of the characteristics of the design of the low-pass filter