pass Transter Function If we denote the denominator polynomial of AM(zas dm(z) D/()=1+d1= M+1 +…+c dmz then it follows that AM(z)can be written as M 2 2 Note from the above that if z=reJo is a pole of a real coefficient allpass transfer function, then it has a zero at z=le Copyright C 2001, S K Mitra9 Copyright © 2001, S. K. Mitra Allpass Transfer Function • If we denote the denominator polynomial of as : then it follows that can be written as: • Note from the above that if is a pole of a real coefficient allpass transfer function, then it has a zero at AM (z) DM (z) M M M DM z d z dM z d z − + − − − = + + + + 1 1 1 1 1 ... ( ) AM (z) ( ) ( ) ( ) D z z D z M M M M A z − −1 =   = j z re −  = j r z e 1