Signal and System
The signals which are function of one or more independent variables contain information about the behavior or nature of some phenomena.
System respond to particularly signals by producing other signals or some desired behavior.
Voltages and currents as a function of time in an electrical circuit are examples of signals and a circuit is itself an example of system which in this case responds to applied voltages and currents.
Few more examples of signals and systems :-
- When an automobile driver depresses the accelerator pedal, the automobile responds by increasing the speed of the vehicle. In this case, the system is the automobile, the pressure applied on the accelerator pedal is the input to the system and automobile speed is the response of applied signal.
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- A computer program for the automated diagnosis of electrocardiograms (E.C.G.) can be viewed as a system which has its input a digitized electrocardiogram and which produces estimation of parameters such as heart rate as output.
- A camera can be considered as a system that receives light from different sources and reflected from objects produces a photograph.
- A robot arm is a system whose movements are the response to control inputs.