Hello all,

This is purely technical stuff starts with the definition of communication. 

As we all know that communication is nothing but exchange of information whatever it might be like video, image, voice etc.

To define in technical terms, it is a process by which information is transmitted from one point called source to another point called destination.

The basic elements of communication are a transmitter, channel, receiver.

When the distance involved in communication is beyond the direct communication then telecommunication engineering comes into picture.

There are two types of communication which comes under telecommunication engineering

1)Line Communication (Point to point communication)

2)Radio Communication (Broadcasting)

Telecommunication over fixed lines is called point to point communication because it is in between one transmitter and one receiver.

Telecommunication through radio broadcasts is called broadcast communication because it is in between one powerful transmitter and numerous low power sensitive receivers.

In order to send our information from transmitter to receiver there should be some through which it can pass. This is known as Channel.

There are two types of media depending on the type of communication.

1)Guided Media (Wired or Line Communication.

Examples: Parallel Wire Communication, Coaxial Cable Communication, Twisted Wire Communication, Optical Fibre Communication.

2)Unguided Media (Wireless or Radio Communication)

Examples: Ground Wave Communication, Sky Wave Communication, Space Wave Communication, Satellite Communication.

A particular channel can only transmit signals of specific frequency range which is called operating frequency of that transmission medium.

Elements of Communication System:

The above are the elements of communication system.

1)Source: It provides information to be transmitted. It can be voice, video, speech, images etc.

2)Transducer: A device which is used to convert non electrical signal to electrical and vice versa. At the Transmitter section whatever our information might be it will definitely be a non-electrical signal which is to be converted to electrical signal in order to have communication. At the receiver again the received information which is in electric form should be converted to non-electrical signal by using output transducer. Because the information should be exactly the same after reaching the destination.

Examples of input transducers are mike, camera, keyboard, fax machines etc.

Examples of output transducers are speaker, printer, monitor etc.

3)Transmitter: It is the arrangement that coverts information into a signal that is suitable for transmission over a medium.

4)Channel: The medium through which the electrical signal travels.

5)Noise: It is an undesirable electric energy that enters the communication system and interferes with the desired signal. It is always random and unpredictable.