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( Jo) and Y(ejo ) exist The previous equation can be alternately written as k e k y(e0)=∑pk e Jok X(e/) k=0 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(ej) and Y(ej) exist • The previous equation can be alternately written as ( ) ( ) 0 0  =  −  = −         =        j M k j k k j N k j k k d e Y e p e X e