Communication Systems


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Communication Systems

  2. 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. 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. 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. 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. 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.
  8. 8. COMMUNICATION SYSTEMS  Like all systems, communication systems follow the universal systems model.
  9. 9. COMMUNICATION SYSTEMS  Inputs:  People  Information  Materials  Tools and machines  Energy  Capital  Time
  10. 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. 11. TELECOMMUNICATIONS  Telecommunications means communicating over a long distance.
  12. 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. 13. COMMUNICATION SYSTEMS  Morse code
  14. 14. COMMUNICATION SYSTEMS  The Telephone by Alexander Graham Bell  Video: Inventoon
  15. 15. COMMUNICATION SYSTEMS Video: Digital vs. Analog
  16. 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. 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. 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. 19. COMMUNICATION SYSTEMS  Television  Video: How Television Works
  20. 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
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