5.1.2 Phase Distortion and Delay To understand the effect of the phase and the group delay of a linear system, first consider the ideal delay system yin=xn-n ◆ The impulse response The frequency response hide) Jwn e J ∠H d s <丌 99 5.1.2 Phase Distortion and Delay     hid n =  n − nd     n nd y n = x − ( ) d j w jwn i d H e e − = ( ) =1 jw id H e H (e )= −wnd w  j w i d , ◆The frequency response ◆The impulse response ◆To understand the effect of the phase and the group delay of a linear system, first consider the ideal delay system: