线性非时变系统的卷积的demo，有助于对卷积的理解。欢迎大家分享之-As one would learn in a basic signal processing/controls/dynamical systems class, the multiplication by an LTI transfer function F(s) in the frequency domain is the same operation as convolution with f(t) in the time

一个简单的信息隐藏程序，Contraband Hell Edition(CHE)-A simple information hiding process, Contraband Hell Edition (CHE)