信号与系统的电子书，作者刘树棠，可作为学习信号的辅助书籍-Signals and systems e-book, the author Liu Shutang can be used as supplementary books to study signal

信号与系统的主要内容和MATALB软件的简介和简单功能。-The main content of signals and systems and MATALB and simple introduction to the software functionality.

内涵北航信号处理系统设计与实现的考核题的答案和一篇综述，里面代码实现了滤波等功能，方便后来人使用-Connotation buaa signal processing system design and implementation of the examination the answer to question and a review, inside a filter code realization, and other functions, convenient use future

画出矩形脉冲波形，并对其进行调制，载波为正弦信号，并画出任意延时后的波形-Draw the rectangular pulse waveform, and its modulation, Carrier is a sinusoidal signal, and to draw an arbitrary delay the waveform after