Types of Communication System
Category : JEE Main & Advanced
Communication systems can be classified according to the nature of information or mode of transmission or types of transmission channel.
(1) According to the nature of information source
(i) Speech transmission
(ii) Picture transmission
(iii) Facsimile transmission (FAX) : This involves exact reproduction of a document or picture which are static.
(2) According to the mode of transmission
(i) Analog communication : The communication system, which make use of analog signals are called analog communication system.
Few analog communication system
| System | Specification |
| Telegraphy | Message in the form of codes are sent. |
| Television broadcast | Both sound as well as pictures are sent. |
| Telephony | It sends voice signal from one place to another by means of wire. |
| Radar | It means radio detection and ranging. It is used for determining the distance and direction of objects using microwave. |
| Teleprinting | Message can be typed and telegraphed to distant receivers |
(ii) Digital communication : In this system digital signals are used.
Few digital communication system
| System | Specification |
| Facsimile transmission (FAX) | This involves exact reproduction of a document or picture which are static |
| Mobile phone | Such telephones are also called cellular phones, because they operate within a network of radio cells. |
| the message sent via a computer network are called e-mail | |
| Tele conferencing | It is a system in which persons sitting at coloured television screens. See and talk to each other via a computer communication network. |
| Communication satellite | Used to relay radio and television programmers. |
| Global positioning system (GPS) | It is a navigation system based on a network of earth orbiting satellites. The users can find their positions within an accuracy of 100 m by receiving. |
(3) According to the transmission channel
(i) Line communication
(ii) Space communication
(4) According to the type of modulation
(i) Amplitude modulation (AM)
(ii) Frequency modulation (FM)
(iii) Phase modulation (PM)
(iv) Pulse amplitude modulation (PAM)
(v) Pulse time modulation (PTM)
(vi) Pulse code modulation (PCM)
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