Signal System

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Signal is an electric or electromagnetic current carrying data, that can be transmitted or received.

Mathematically represented as a function of an independent variable e.g. density, depth, etc. Therefore, a signal is a physical quantity that varies with time, space, or any other independent variable by which information can be conveyed. Here independent variable is time.

Types of time signals:

Continuous time signals x(t)- defined at every point in time
Discrete time signals x[n] – defined only at a discrete set of values of time (integer).
A System is any physical set of components or a function of several devices that takes a signal in input, and produces a signal as output.