Information Source: Examples of Information that we wish to communicate are voice signals, music signal, picture, video or data file.
Transmitter: Transmitter is a generic term for the processing of the information in the form provided by the information source
Channel or transmission medium: Examples of channel or transmission medium are, cable, optical fibre or free space (wired channel and wireless channel-difference between them is of attenuation and distortion).
Receiver: Receiver is a generic term for the process of converting the signal transmitted over the channel back to a form that may be understood at the destination. The receiver may also have to compensate for the distortion introduced by the channel and perform other function such as synchronization of the receiver to the transmitter.
In digital communication, when distortion comes it is analog in nature.
Deterministic Signal: A signal is a deterministic signal whose physical description is known completely either in mathematical or in graphical form.
A signal that is known only in terms of probabilistic descriptions such as mean, variable, distribution rather than its full mathematical or graphical description is called Random Signal.
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