一个GUI，低通滤波器，可以滤除音频信号的噪声部分，参数可以自己设定。基本原理采用多种不同滤波器进行比较-A GUI, low-pass filter, to filter out the noise part of the audio signal, the parameter can be set. The basic principles of using a variety of different filters are compared

主要利用进程控制，传递参数给madplayer，画界面用到了Qt。-The program mainly use process control,the main program pass the parameter to madplayer.And the GUI use Qt.