说明：  matlab 的 am和dsb调制 先你得介绍 am 的调制的基本原理，解调的基本原理，这个书上肯定都有很多，你按照自己的理解重新再组织
(Matlab am and DSB modulation first you have to introduce the basic principles of the AM modulation and demodulation of the basic principles, this book certainly has a lot of you according to their own understanding of re-organization)