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8/3/2019 Communication Systems INTRO
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Communication
SystemsFoundations of Engineering and Technology
Based on Technology: Today & Tomorrow
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Communication Systems
History of Communications: 1450 Johannes Gutenberg builds the movable printing press.
1826 Joseph Niepce of produces the wrolds first permanentphotographic 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 inthe USA
1990 The world wide web is created in Europe. Its chiefarchitect is Tim Berners-Lee.
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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 SystemsPowerPoint Project)
Assignment 2:
Fill in the Communications Systems vocabulary sheet aswe go through this unit. Use the PowerPoint, textbook,
and any other resources to complete the worksheet.
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Communication Systems
Communication is the ability to send and
receive messages.
People to people
People to machine
Machine to people
Machine to machine
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Communication Systems
Messages are intended to:
Informnews papers, TV news casts
Educatetexts, video, DVDs, internet.
Persuade - advertising
Controlmachines 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.
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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.
http://www.youtube.com/watch?v=Wk2VYwCIcZEhttp://www.youtube.com/watch?v=Wk2VYwCIcZE8/3/2019 Communication Systems INTRO
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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.
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Communication Systems
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Communication Systems
Like all systems, communication systems follow
the universal systems model.
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Communication Systems
Inputs:
People
Information
Materials
Tools and machines
Energy
Capital
Time
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Communication Systems
Processes
Outputs
Positive OutputsThe desired result of the system.
Negative OutputsThe unwanted results created by thesystems.
Electromagnetic Radiation
Telemarketing Calls
Pollution - Old phones, computers, devices, etc.
Feedback
Your response to communications
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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.
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Telecommunications
Telecommunications means communicating
over a long distance.
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Communication Systems
The telegraph by Samuel Morse.
Sent electronic signals using wires.
Morse devised a language with a series of longand short signals that represented letters and
numbers.
Video:Telegraph Machine
http://www.youtube.com/watch?v=3tDX85ZK14Qhttp://www.youtube.com/watch?v=3tDX85ZK14Q8/3/2019 Communication Systems INTRO
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Communication Systems
Morse code Assignment 4:
Using an old set of walkietalkies, send a classmate a
message using Morse Code.
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Communication Systems
The Telephone by Alexander Graham Bell
Video: Inventoon
http://www.youtube.com/watch?v=HXBl9dg3YhEhttp://www.youtube.com/watch?v=HXBl9dg3YhE8/3/2019 Communication Systems INTRO
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Communication Systems
Video: Digital vs. Analog
http://www.youtube.com/watch?v=kR7227_ndqQhttp://www.youtube.com/watch?v=kR7227_ndqQ8/3/2019 Communication Systems INTRO
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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.
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Communication Systems
Optical Fibers: thin fibersof pure glass that carrysignals in the form of
pulses of light. Eachoptical fiber is surroundedby a reflective claddingand an outside protective
coating. The light pulsesare converted to electronicsignals.
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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 withoutconnecting 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.
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Communication Systems
Television
Video: How Television Works
http://www.youtube.com/watch?v=TE_agdPYYWQ&feature=relatedhttp://www.youtube.com/watch?v=TE_agdPYYWQ&feature=related8/3/2019 Communication Systems INTRO
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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)
http://www.youtube.com/watch?v=J4gGalZV8TMhttp://www.youtube.com/watch?v=J4gGalZV8TMRecommended