Discrete time systems

A system is an inter connection of  components. It is a physical device that performs an operation on an input signal and produces another signal as output.
A discrete time system is one that takes discrete time signal as input and produces a discrete time signal as output. The input is denoted by x(n) and out put signal is denoted by y(n).
The system may be denoted by.
y(n)=T[x(n)] ie. output is a transformation of input.
The transformation can be shifting,scaling,etc or a mixture of these, we will come to these operations on signals later :).

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