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.

多载波系统中的交调失真，输入信号是频率在11Hz和 14Hz的双音带通信号。-Multicarrier system intermodulation distortion, the input signal is frequency 11Hz and 14Hz dual tape communication number.