A system is defined as an entity that acts on an input signal x(t) and Transforms it into an output signal y(t)
In a system, there exists Cause and effect relationship between two (or) more signals
ex:- Electrical systems, mechanical systems etc.
A system is represented by a block, which accepts signals as inputs and produces signals as outputs.
input signal:- is called as excitation , source 9or) driving function -x(t)
output signal:- is called as response-y(t)
systems may be single input single output systems (or) Multi input Multi output systems.
Here we discuss only about SISO systems only.
T- Transformation of x(t) (Or) operation on x(t).
In general systems are either Continuous -Time (or) Discrete Time systems.
|continuous-Time systems (CT system)||Discrete-Time systems (DT system)|
|A system that operates/produces on Continuous Time signals is a CT system.||A system that operates/produces on Discrete Time signals and produces a DT signals is a DT system.|
Classification of systems:-
Systems are classified into