ABSTRACT
Those who give up liberty for the sake of security deserve neither liberty nor security.
Benjamin Franklin
Recall that a discrete-time system can be defi ned as a process in which an input sequence(s) f(n) referred as the excitation is transformed into an output sequence(s) g(n) referred to as the response, using a set of predefi ned rules, algorithms, or in most practical cases a set of difference equations. The discussion in this chapter will be restricted to single inputsingle output (SISO) systems since they constitute the vast majority of the practical digital systems and the best model to introduce the tools of analysis and synthesis due to its simplicity. The transition from a SISO to a multiple input or output system is a simple process since almost all the systems considered in this chapter are LTI systems and the general principles of superposition hold.
