Download - Communication Systems INTRO

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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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 is the ability to send and

receive messages.

People to people

People to machine

Machine to people

Machine to machine


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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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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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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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Like all systems, communication systems follow

the universal systems model.


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Inputs:

People

Information

Materials

Tools and machines

Energy

Capital

Time


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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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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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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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Morse code Assignment 4:

Using an old set of walkietalkies, send a classmate a

message using Morse Code.


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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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Video: Digital vs. Analog
http://www.youtube.com/watch?v=kR7227_ndqQhttp://www.youtube.com/watch?v=kR7227_ndqQ


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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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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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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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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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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