Transcript File - LMHS Science Classroom Connect

SENIOR SCIENCE
INFORMATION SYSTEMS
PART 1: TYPES OF INFORMATION SYSTEMS
Modern Information
Systems
Discovery of the properties
and applications of
electromagnetic waves
Simple
beginnings
Telegraph
Conditions for
transmission, reflection
and diffraction
Travel along
optical fibres and
waveguides
Simple
diodes and
triodes
Use of binary
codes in digital
communication
Telephone
Radio
TV
Microwave
technology
International TV and telephone
communication via geostationary
satellites
Mobile
phone
Travel as
ground, sky or
space waves
Developme
nt of
electronics
Transistors
Integrated
Circuits
OUTLINE THE BASIC PATTERN OF THE INFORMATION
TRANSFER PROCESS AS
- CODE COMMON TO BOTH PARTIES
- MESSAGE
- TRANSMISSION OF CODED MESSAGE
- DECODER
THE COMMUNICATION MODEL
1.
Sender codes the message in some form of signal that is both understood by
the sender and receiver.
2. It is transmitted by a communication channel
•
3.
Eg. Soundwaves (talking), electrical currents (telephone), electromagnetic radiation (radio,
microwaves, light)
Messaged is received and decoded.
THE COMMUNICATION MODEL
Message
Coded
Transmitter
Channel
Noise
Outside interference.
Limits the distance over which
we can communicate.
Detector
Decoding
Message
IDENTIFY A RANGE OF INFORMATION SYSTEMS
USED DAILY
DISCUSS THE ADVANTAGES OF USING A RANGE
OF INFORMATION SYSTEMS
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
CLASSIFY INFORMATION SYSTEMS AS
- VERBAL AND NONVERBAL
- SHORT DISTANCE AND LONG DISTANCE
- ELECTRONIC AND NON-ELECTRONIC
VERBAL AND NON-VERBAL
Spoken and written language are the most basic forms of communication.
Verbal
Non-verbal
Spoken language
Pictures
Symbols
Body language
Voice tone
SHORT DISTANCE AND LONG DISTANCE
Short distance
Talking one-on-one
Talking in small groups
Communication involving teaching/lecture
Morse code by light or wire
Long distance
Phone conversation
Internet (Skype, chat…)
Messaging
Done with the
help of metal
cables and optic
fibre cables
ELECTRONIC AND NON-ELECTRONIC
Electronic
Telephone
Fax
Email
Television
Non-electronic
Paper mail
Printed media (Newspaper,
magazine)
Books
RECALL PHENOMENA AND EVENTS WHERE
DIFFERENT FORMS OF ENERGY ARE USED
TYPES OF ENERGY
Match the forms of energy below with the type of energy involved
Form of energy
Type of energy
chemical potential
kinetic
heat
light
sound electromagnetic electrical
solar nuclear
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
TYPES OF 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
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.
LAND CONNECTED TELEPHONES
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.
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.
TELEVISION
Light energy &
Sound energy
Electrical
energy
Light energy &
Sound energy
OR
Light energy &
Sound energy
Electromagnetic
radiation
Light energy &
Sound energy
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.
RADIOS
COMPACT DISC PLAYER
• 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
COMPACT DISC PLAYER
COMPACT DISC PLAYER
COMPACT DISC PLAYER
COMPACT DISC PLAYER