1. Senior Science Information Systems
Part 1: Types of information systems

2. Modern Information Systems
Simple beginnings
Telegraph
Telephone
Radio
Microwave technology
Mobile phone TV
International TV and telephone communication via geostationary satellites
Discovery of the properties and applications of electromagnetic waves
Conditions for transmission, reflection and diffraction
Travel as ground, sky or space waves
Travel along optical fibres and waveguides
Development of electronics
Simple diodes and triodes
Use of binary codes in digital communication
Transistors
Integrated Circuits

3. Outline the basic pattern of the information transfer process as
Outline the basic pattern of the information transfer process as - Code common to both parties - message - transmission of coded message - decoder

4. The Communication Model
Sender codes the message in some form of signal that is both understood by the sender and receiver.
It is transmitted by a communication channel
Eg. Soundwaves (talking), electrical currents (telephone), electromagnetic radiation (radio, microwaves, light)
Messaged is received and decoded.

5. The Communication model
Message
Coded
Transmitter
Channel
Detector
Decoding
Noise
The Communication model
Outside interference.
Limits the distance over which we can communicate.

6. Identify a range of information systems used daily Discuss the advantages of using a range of information systems

7. What information systems do you use?
Brainstorm the variety of information systems that you have used in the past week. Discuss the relative merit of each system. Summaries your class discussions in a table with the headings Information System, Advantages, Disadvantages.
Information System
Advantages
Disadvantages

8. Classify information systems as. - Verbal and nonverbal
Classify information systems as - Verbal and nonverbal - Short distance and long distance - Electronic and non-electronic

9. Verbal and non-verbal Verbal Non-verbal
Spoken and written language are the most basic forms of communication.
Verbal
Non-verbal
Spoken language
Pictures
Symbols
Body language
Voice tone

10. Short distance and long distance
Talking one-on-one
Talking in small groups
Communication involving teaching/lecture
Morse code by light or wire
Phone conversation
Internet (Skype, chat…)
Messaging
Done with the help of metal cables and optic fibre cables

11. Electronic and non-electronic
Telephone
Fax
Television
Paper mail
Printed media (Newspaper, magazine)
Books

12. Recall phenomena and events where different forms of energy are used

13. Energy can NOT be created or destroyed
Types of energy
Match the forms of energy below with the type of energy involved
Form of energy
chemical potential kinetic heat light sound electromagnetic electrical
solar nuclear
Type of energy
energy released as traveling vibrations movement energy energy carried as waves at the speed of light energy carried by moving electrons
energy stored in chemicals energy from light source energy that can be released later energy from the Sun
energy from differences in temperature
energy released from converting mass into energy during fission or fusion

14. Types of energy

15. 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

16. Land connected telephones
Write the information on right in the appropriate places on the diagram using the telephone section of the audiotape/internet audio files. Note that electrical impulses are bursts of electrical energy.
electrical impulses entering telephone
microphone transforms sound energy into kinetic energy of a diaphragm then electrical energy
speaker transforms electrical impulses into kinetic energy of a diaphragm then sound energy
electrical impulses are sent to phone line
electrical impulses are converted into light energy or electromagnetic energy for long distance transmission. ? ? ? ? ?

17. Land connected telephones

18. Mobile phones
Self-contained transmitters and receivers of radio waves.
A local antennae transmitter (tower) picks up the radio waves in a certain geographical area called a cell.
Microwaves are also used to relay transmission of the message.

19. televison
A TV camera transforms light energy (visual images) into electrical signals (energy).
The signals are amplified and transmitted in the broadcasting network.
The TV (in your home) detects the signals and produces an image on the screen.
Audio information (sound) is transmitted simultaneously.

20. OR Television Light energy & Sound energy Electrical energy
Electromagnetic radiation

21. radios
A radio system consists of a microphone linked to a transmitter and a receiver linked to a loud speaker.
The radio receiver is tuned to detect a signal at a particular frequency.
Someone speaks into the microphone, the sound waves are converted to electrical signals, the signals are then used to control radio waves.
The process of adding information to radio waves is called MODULATION.
The radio station sends out the signal and an aerial picks up the radio wave.

22. radios

23. Compact disc player Video CDs store information digitally.
The digital signals are coded as binary patterns on the CD.
CD players use light from a laser to read the coded message.
The digital signals are converted from original signal, amplified and converted to sound by the speaker.
Video

24. Compact disc player

25. Compact disc player

26. Compact disc player

27. Compact disc player