包含有信号源的数字滤波器设计，文件中包含有高通，低通，带通，带阻四种数字滤波器。-The program is used to design a digital filter.There are four kinds of digital filter included in the file.

利用电流传送器CCII实现的有源polyphase滤波器设计，ORCAD软件仿真的，可以直接打开，运行-Use of current conveyor CCII achieve active polyphase filter design, ORCAD software simulation, you can directly open and run