这是一个用verilog写的DC滤波器，即melp算法中预处理部分，主要滤除50hz工频干扰，采用一个4阶的切比雪夫高通滤波器，截去频率位60hz以下的信号，其阻带的衰减位30db。-This is a verilog to write a DC filter the preprocessing part that melp algorithm, main filter 50hz frequency interference, the use of a fourth-order Chebyshe