Phase and Group Delays The input can be rewritten as xn]=a cos(oen)+a cos(Oun) where oe=oc-Oo and Qu=oc+oo Let the above input be processed by an Lti discrete-time system with a frequency response H(e/o) satisfying the condition H(e/0)三1 for oe≤0≤Oln Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 6 Phase and Group Delays • The input can be rewritten as where and • Let the above input be processed by an LTI discrete-time system with a frequency response satisfying the condition [ ] cos( ) cos( ) 2 2 x n n un A A =  +   = c −o u = c +o ( ) j H e u j H e        ( ) 1 for