Allpass Transfer Function Definition An IR transfer function A(z)with unity magnitude response for all frequencies, i.e A(e )=1, for all o is called an allpass transfer function An m-th order causal real-coefficient allpass transfer function is of the form A1(2)=±+d M+1 M M-1 z+…+a1z 1+l1=1++d10-12-M+1+lb=-M Copyright C 2001, S K Mitra8 Copyright © 2001, S. K. Mitra Allpass Transfer Function Definition • An IIR transfer function A(z) with unity magnitude response for all frequencies, i.e., is called an allpass transfer function • An M-th order causal real-coefficient allpass transfer function is of the form = w w | ( )| 1, for all j 2 A e M M M M M M M M M d z d z d z d d z d z z A z − + − − − − − + − − + + + + + + + + =  1 1 1 1 1 1 1 1 1 ... ... ( )