84.1 LTI Discrete-Time Systems in the transform domain In developing the transform-domain representation of the difference equation, it has been tacitly assumed that x(ej) and Y(ejo) exist The le previous equation can be alternatel written as e/0 ∑ (l)=∑ h?e圆oh LX(e/o k=0§4.1 LTI Discrete-Time Systems in the Transform Domain • In developing the transform-domain representation of the difference equation, it has been tacitly assumed that X(ejω) and Y(ejω) exist • The previous equation can be alternately written as ( ) ( ) 0 0 ω = ω − ω = − ω        = ∑      ∑ j M k j k k j N k j k k d e Y e p e X e