Allpass Transfer Function Definition An iir transfer function A(=)with unity magnitude response for all frequencies, 1.e A(e/@ )/2 or all o is called an allpass transfer function An m-th order causal real-coefficient allpass transfer function is of the form Ay()=±aM+a+…+1 M+1 M z 1+d1z-+…+dM-12 M+1 M Copyright C 2001, S K Mitra3 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 =   | ( )| 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 ... ... ( )