巴特沃兹滤波器的极零点分布 B(s)2= 2n Q 1+ +(-1) 2n +1 n=odd n=even 2kT (2k-1)丌 n 2n n=od k n=even7 巴特沃兹滤波器的极零点分布 n n j s n s H s 2 0 2 0 2 1 ( 1) 1 1 1 ( )          + − =                         + = = S e n odd n k j k =  =       , 2 2 0  S e n even n k j k =  =       − , 2 (2 1) 0     − = + = =          n even s n odd n 1 1 2 0