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

TbsZip是一个PHP的类用来读写Zip压缩文件包，该类无需PHP扩展或者是临时文件。TbsZip可以对压缩文档中的文件进行读、写、修改和删除操作。- Tbszip is a PHP class which can read a zip archive,and even edit sub-files in the archive and then create a new archive.