Communication Systems

1. CommunicationSystems 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 • Email • 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)