The classifications of discrete time signals have been introduced. Let us introduce discrete time systems. A device or an algorithm which performs some particular operations on the discrete time signal is known as a discrete time system. Figure 1.24 shows the input and output of a discrete time system.
Fig. 1.24 A discrete time system
In Fig. 1.24, y(n) is the response for the excitation x(n). The input-output relationship for discrete time system is given by
where T represents ...