1. COMMUNICATION
SYSTEMS

2. COMMUNICATION SYSTEMS
History of Communications:
 1450 Johannes Gutenberg builds the movable printing
press.
 1826 Joseph Niepce of produces the wrold’s first
permanent photographic image.
 1876-Alexander Graham Bell introduced telephone.
 1877 Thomas Edison patents the phonograph.
 1891 Thomas Edison and William Dickson invent the
kinetoscope.
 1895 Guglielmo Marconi develops the wireless
telegraph
 1925 John Logie Baird transmits the first television
signal.
 1954 The transister radio or tubeless radios become
available in the USA
 1990 The world wide web is created in Europe. It’s
chief architect is Tim Berners-Lee.

3. COMMUNICATION SYSTEMS
 Communication is the ability to send and
receive messages.
 People to people
 People to machine
 Machine to people
 Machine to machine

4. COMMUNICATION SYSTEMS
 Messages are intended to:
 Inform – news papers, TV news casts
 Educate – texts, video, DVD’s, internet.
 Persuade - advertising
 Control – machines and tools such as Computer
Numeric Control: A type of programmable
control system, directed by mathematical
data, which uses microcomputers to carry
out various machining operations; such as a
mill or lathe.

5. COMMUNICATION SYSTEMS
 CNC Milling Video
 An example of communications used to
control is traffic signals and sensors that are
used to send messages to the traffic signals.

6. COMMUNICATION SYSTEMS
 All communication systems include a
message, a sender, a communication
channel, and a receiver.
 A communication channel is the path over
which a message must travel to get from the
sender to the receiver.

7. COMMUNICATION SYSTEMS

8. COMMUNICATION SYSTEMS
 Like all systems, communication systems
follow the universal systems model.

9. COMMUNICATION SYSTEMS
 Inputs:
 People
 Information
 Materials
 Tools and machines
 Energy
 Capital
 Time

10. COMMUNICATION SYSTEMS
 Processes
 Outputs
 Positive Outputs – The desired result of the system.
 Negative Outputs – The unwanted results created by the
systems.
 Electromagnetic Radiation
 Telemarketing Calls
 Pollution - Old phones, computers, devices, etc.
 Feedback
 Your response to communications

11. TELECOMMUNICATIONS
 Telecommunications means communicating
over a long distance.

12. COMMUNICATION SYSTEMS
 The telegraph by Samuel Morse.
 Sent electronic signals using wires.
 Morse devised a language with a series of
long and short signals that represented
letters and numbers.
 Video: Telegraph Machine

13. COMMUNICATION SYSTEMS
 Morse code

14. COMMUNICATION SYSTEMS
 The Telephone by Alexander Graham Bell
 Video: Inventoon

15. COMMUNICATION SYSTEMS
Video: Digital vs. Analog

16. COMMUNICATION SYSTEMS
 Transmission Channels
 Copper Wire: Many older phones
consist of two thin insulated copper
wires twisted around each other.
 Coaxial Cable: Carry many more
messages all at once than twisted-
pair wire. Consists of an outer tube
made of a material that conducts
electricity (usually copper). Inside the
tube is an insulated central conductor
(also copper). Several of these cables
are combined into one bundle.

17. COMMUNICATION SYSTEMS
 Optical Fibers: thin
fibers of pure glass that
carry signals in the
form of pulses of light.
Each optical fiber is
surrounded by a
reflective cladding and
an outside protective
coating. The light
pulses are converted to
electronic signals.

18. COMMUNICATION SYSTEMS
 Microwaves can be used to carry phone
conversations over long distances. Microwaves are
very short electromagnetic waves that travel
through the atmosphere and make communication
without connecting wires possible.
 In cell phones, sound waves are changed into
microwaves. They are transmitted using an
antenna (sent and received) and converted back to
sound waves.

19. COMMUNICATION SYSTEMS
 Television
 Video: How Television Works

20. COMMUNICATION SYSTEMS
 Satellite Communication Systems
 A communication satellite is a device placed
into orbit above earth to receive messages
from one location and transmit them to
another.
 It reflects signals back to earth like a mirror.
 SES Global Video