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=Wk2VYwCIcZE
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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

    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.

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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=3tDX85ZK14Q
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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=HXBl9dg3YhE
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    Communication Systems

    Video: Digital vs. Analog

    http://www.youtube.com/watch?v=kR7227_ndqQhttp://www.youtube.com/watch?v=kR7227_ndqQ
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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=related
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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=J4gGalZV8TM