试用奇阶互补法设计两带滤波器组(高、低通互补)，进而实现四带滤波器组；并画出其频响。滤波器设计参数为：Fp＝1.7KHz, Fr＝2.3KHz, Fs＝8KHz, Armin≥70dB。-Try odd order with two complementary methods designed to filter group (high and low pass complementary), thus achieving four-band filter group and draw its