pass I ransrer Function The unwrapped phase function 0c(o)of a stable all pass function is a monotonically decreasing function of o so that t(o)is everywhere positive in the range 0<O< T The group delay of an M-th order stable real-coefficient allpass transfer function satisfies ∫τ(0)do=M 18 Copyright C 2001, S K Mitra18 Copyright © 2001, S. K. Mitra Allpass Transfer Function • The unwrapped phase function of a stable allpass function is a monotonically decreasing function of w so that t(w) is everywhere positive in the range 0 < w < p • The group delay of an M-th order stable real-coefficient allpass transfer function satisfies: q (w) c  t w w= p p d M 0 ( )