说明：  针对数字滤波器的特点，利用双线性变换方法计算了不同带阻条件下的传递函数，并用matlab程序实现。附有仿真效果图。
(According to the characteristics of the digital filter using bilinear transformation method to calculate the transfer function of the band-stop under different conditions and procedures implemented by matlab. With simulation results Fig.)