Section 1
Outline the basic pattern of the information transfer process as
– Code common to both parties
– Message
– Transmission of coded message
– Decoder
Basic pattern of the information transfer process:
– Code common to both parties (Language)
– Message or encoding (Involve creating the message so that it is in a form which can be easily sent)
– Transmission of coded message (The coded message must be sent in order for the other party to receive)
– Decoder (Puts the message into a form which can be understood)

HSC question:
Situation
Code
Transition
Decoding
Talking to another person
Language
Sound wave
Ear and brain
Sending a fax
Digital signal
Electric current
Printer
Watching television
Language, Pictures, Actions
Microwave or radio wave
Aerial and TV set decode to light and sound
Listening to radio
Language
Radio wave
Aerial and radio speaker

Identify a range of information systems used daily Identify a range of communication system used daily
_Talking and listening: using phone, conversation, TV
_Reading: Newspapers, Magazines, and Letters
_Electronics: Using computers and faxes

Classify information system as:
_Verbal and Non-verbal _Short distance and long distance _Electronic and non-electronic

Communication System
Verbal or Non-verbal
Short or long distance
Electronics or non-electronic
Talking
Verbal
Short
Non
Writing
Verbal
Long
Non
Video Conferencing
Verbal
Long
Electronics
Am radio
Verbal
Long
Electronics
Smoke signal
Non-Verbal
Short
Electronics
Facial Expression
Non-Verbal
Short
Non
Email
Verbal
Long
Electronics

Recall phenomena and events where different forms of energy are used Coding and decoding device are energy converters. They transform one form of energy to another.
Examples:
_Switching on light electrical energy is converted to light energy
_Walking chemical energy is converted to kinetic energy
_Using toaster electrical energy is converted to radiant energy (Heat)
_Talking mechanical energy is converted into sound energy

Identify the transformation of energy at each stage of information transfer in the following devices
– Land connected telephones – mobile phones
– Television
– Radios
– Compact Disc players

Discuss the advantages of using a range of information systems
Gather and process information from secondary sources to develop a timeline of communication systems introduced to society and use the available evidence to analyze the impact these systems have had on society and predict possible future directions in communication technologies

Section: 2 Electromagnetic radiations can be modulated to carry different types of information
Identify the types of waves 
in the electromagnetic spectrum currently used for communication systems as
– Visible light – Infra-red

– Microwaves

– Radio waves, which include: TV, FM radio, and AM radio
Electromagnetic spectrum that are currently used for commination systems are Visible lights, Infrared, Microwaves, Radio they are useful for communication because they don’t need medium to travel through
Order of wave energy from lowest to highest: Radio waves, Microwaves, Infrared, Light, Ultra violet, X-ray, Gamma rays

Amplitude: the maximum or minimum displacement from the displacement
Frequency: the number of complete cycle that pass a point each second
Wavelength is the distance between the same two points on consecutive waves
Compare the advantages and disadvantages of using microwaves and radio waves in communication technologies
_They can travel through both air and cable system
Electromagnetic waves can send through atmosphere and empty space. (Remote control, traffic lights)
Electromagnetic waves can send through fiber-optic, metal wire (Land line telephone, intercoms)
Advantages:
_The signal and receiver do not need to be physically connected to each other: therefore
Communication is possible with remote sites
Communication is possible while moving rapidly
_Signals can be sent to large number if receivers at the same