使用海明窗设计带阻FIR滤波器，性能指标为：阻带边界频率 ，低通边界频率 ，高通边界频率 ，通带纹波 ，阻带纹波 ，描述设计过程，并绘制其频率特性图。(The band stop FIR filter is designed by Hamming window. The performance indexes are: stop band boundary frequency, low pass boundary frequency,