1. Communication Systems
Foundations of Engineering and Technology
Based on Technology: Today & Tomorrow

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
Assignment 1:
Have students pick one form of communication technology and develop a PowerPoint presentation to be presented to the class (See Communication Systems PowerPoint Project)
Assignment 2:
Fill in the Communications Systems vocabulary sheet as we go through this unit. Use the PowerPoint, textbook, and any other resources to complete the worksheet.

4. Communication Systems
Communication is the ability to send and receive messages.
People to people
People to machine
Machine to people
Machine to machine

5. 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.

6. 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.

7. 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.

8. Communication Systems

9. Communication Systems
Like all systems, communication systems follow the universal systems model.

10. Communication Systems
Inputs:
People
Information
Materials
Tools and machines
Energy
Capital
Time

11. 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

12. Communication Systems
Assignment 3:
Using an Excel spreadsheet, keep track of your use of electronic communication devices (see Personal Use of Communication Devices.xls)
List the devices you use including but not limited to:
Cell phones
Computer with or without the internet
Text messaging
IPOD
Video games
Television
Land phone
Be sure to list items that you may not automatically think of:
Purchasing an item by scanning a barcode or debit card.
Washing hands in lavatory and water comes on with a sensor.
Stopped at an intersection under camera surveillance.
Electronic traffic signals or electronic communication devices in your car (signal lights, etc.)
Tabulate your findings and create a pie chart on your daily use.
Compare your usage with the rest of the class.

13. Telecommunications
Telecommunications means communicating over a long distance.

14. 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

15. Communication Systems
Morse code
Assignment 4:
Using an old set of walkie talkies, send a classmate a message using Morse Code.

16. Communication Systems
The Telephone by Alexander Graham Bell
Video: Inventoon

17. Communication Systems
Video: Digital vs. Analog

18. 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.

19. 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.

20. 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.

21. Communication Systems
Television
Video: How Television Works

22. 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 (by permission)