COMMUNICATION SYSTEMS (SS1 3RD TERM)

COMMUNICATION SYSTEMS I

Introduction: 

ICT is an acronym that stands for Information and Communication Technology.

Information is refers to knowledge obtained from reading, investigating, study and research.

Communication is an act of transmitting message.

Technology is the application of scientific knowledge for practical purpose especially in industry.

ICT stand for information and communication technology can be defined as a diverse set of technological tools and resources used to communicate, and to create, disseminate, store, and manage information electronically in a digital form.

Communication System is a process of transmission, reception and processing of information between two or more locations through transmission medium.

Communication strategies in ICT

There are two types of communication strategies in ICT:

1. Synchronous communication

This is a communication strategy where all parties involved in the communication involved are present and available at the same time. E.g. online chat, video conferencing, etc.

2. Asynchronous communication

Asynchronous communication does not require that all parties involved need to be present and available at the same time. E.g. Discussion forum, Blogs e-group, etc.

Products of ICT includes: Personal computers, digital television, email, robots etc. 

Types of ICT

i i. Broadcasting. 

ii ii. Telecommunication. 

iii iii. Data Network. 

iv iv. Information System. 

v v. Satellite Communication 

BROADCASTING: 

T Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium such as Radio, Television etc. 

Types of Broadcasting 

  a. Radio Broadcasting: 

This is an audio (sound) broadcasting service, broadcast, through air waves from a transmitter to an antenna and therefore to a receiving device. Broadcasting by radio may be via AM (Amplitude Modulation), or FM (Frequency Modulation) stations. 

  b. Television Broadcasting: 

Not until 20th Century, broadcast TV programmes were generally transmitted as an analogue television signal, but in recent years public and commercial broadcasters have been progressively introducing digital signals (in 1s and 0s) while analogue transmit audio and video using signals with varying amplitude or frequency. Broadcasting on TV is usually on VHF (Very-High Frequency) or UHF (Ultra-High Frequency). 

  c. Satellite Television System Broadcasting: 

  This is a form of transmission that sends television signals directly to have viewers. The signals are usually received by a satellite dish, the dish serve as an outdoor antenna.

  d.  Webcasting  -  broadcasting over the Internet

Evaluation: 

1. State the full meaning of ICT 

2. Mention three (3) types of ICT 

3. List two (2) types of Broadcasting