求出laguerre滤波器的分子分母系数，绘出其幅频响应图并与FIR滤波器作比较。该程序为19阶Laguerre低通滤波器和22阶带通滤波器-obtained laguerre filter coefficient of molecular denominator, chart its amplitude frequency response plans with the FIR filter for comparison. The procedure for the 19-Laguerre l

巴特沃斯MATLAB实现例子，包含高通、 低通 、带通、 带阻。(Butterworth matlab implementation examples, including high pass, low pass, band pass, band stop.)