图象识别，人脸识别和混合图象、盲信号可以使用此方法-about the realise of image and the realise of the face ,and complex subjects can use the way about ica solution

该图是用来描述采样控制系统的原理。采样控制系统是一个既有离散的数字信号又有连续模拟信号的混合系统。-This figure is used to describe the principle of sampled-data control system. Sampled-data control system has both discrete digital signals and continuous analog signals, which is a mixed system.