(1)设计低通、带通、高通数字滤波器； (2)可以对合成信号(含低频、中频、高频分量)、语音信号进行滤波； (3)通过GUI界面进行控制。-(1) design low pass, band pass, high pass digital filter (2) can be synthesized signal (including the low frequency, medium frequency, high frequency components), filtered s