Finite-Dimensional Discrete Time LTI Systems An important subclass of discrete-time LTI systems is characterized by a linear constant coefficient difference equation of the form M ∑dkyn-k]=∑Pkxm-] k=0 k=0 xn] and y[n]are, respectively, the input and the output of the system k, and k are constants characterizing the system Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 14 Finite-Dimensional Discrete￾Time LTI Systems • An important subclass of discrete-time LTI systems is characterized by a linear constant￾coefficient difference equation of the form • x[n] and y[n] are, respectively, the input and the output of the system • and are constants characterizing the system { } dk { } pk   = = − = − M k k N k k d y n k p x n k 0 0 [ ] [ ]