Transcript Encoder

Drill October 20, 2010
Match the statements with the correct term below:
1. A device that changes a message into a form that can
be transmitted
2. A device that sends a signal (i.e., encoded message)
3. A device that acquires a signal (i.e., encoded message)
4. A device that changes a coded message into an
understandable form
Decoder
Receiver
Encoder
Data
Transmitter
IOT
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POLY ENGINEERING
Terms
Match the statements with the correct term below:
1. A device that changes a message into a form that can
be transmitted
2. A device that sends a signal (i.e., encoded message)
3. A device that acquires a signal (i.e., encoded message)
4. A device that changes a coded message into an
understandable form
Decoder
Receiver
Encoder
Data
Transmitter
IOT
2-2
POLY ENGINEERING
Terms
Match the statements with the correct term below:
1.
2.
3.
4.
Unorganized facts
Organized data
Information applied to a task
The sending and receiving of information
Communication
Information
Knowledge
Storage
Data
IOT
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POLY ENGINEERING
Terms
Match the statements with the correct term below:
1.
2.
3.
4.
Unorganized facts
Organized data
Information applied to a task
The sending and receiving of information
Communication
Information
Knowledge
Storage
Data
IOT
2-2
POLY ENGINEERING
ASSIGNMENT 3
AN EXAMPLE FOLLOWS (for the radio)
Using what you created as a solution for ASSIGNMENT
2, now add the following:
1. Description of any non-obvious components
(particularly encoder, transmitter, and decoder, as
in the radio example ahead).
2. A sketch of the system components.
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POLY ENGINEERING
ASSIGNMENT 3 – Example
Radio: DETAILS
Goal: Inform
Persuade
Entertain
Control
Manage
Educate
Source: Sounds and Information
Encoder: Devices that convert sound and info into a modulated sine
wave (rapidly changing electric current in a wire)
ASSIGNMENT 3 – Example
Radio:
Problem:
Sine wave contains no information.
We need to modulate (vary) it.
IOT
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POLY ENGINEERING
ASSIGNMENT 3 – Example
Radio:
Encoder: Devices that convert sound and information into a
modulated sine wave
Pulse Modulation: turn the voltage (sine wave) on/off (Morse Code)
PM
Amplitude Modulation: vary the amplitude (peak-to-peak) voltage
AM
Frequency Modulation: vary the frequency (speed)
FM
IOT
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POLY ENGINEERING
Pulse Modulation: turn the voltage (sine wave) on/off (Morse Code)
PM
Amplitude Modulation: vary the amplitude (peak-to-peak) voltage
AM
Frequency Modulation: vary the frequency (speed)
FM
IOT
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POLY ENGINEERING
ASSIGNMENT 3 – Example
Radio:
Goal: Inform
Persuade
Entertain
Control
Manage
Educate
Receiver
Decoder
Source
Encoder
Transmitter
Destination
IOT
POLY ENGINEERING
ASSIGNMENT 3 – REMINDER
– Assignment should be set up similar to our example.
– Also, include a labeled diagram.
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POLY ENGINEERING
History of Communication Technology
Classes of Communication Technology
Descriptions
– Print Graphic Communication
Visual, lingual messages that include printed media
– Photographic Communication
Using photographs, slides, or motion pictures to
communicate a message
– Telecommunications
Communicating over a distance
– Technical Graphic Communication
Specific information about a product or its parts
Size and shape, how to install, adjust, operate, maintain,
or assemble a device
Classes of Communication Technology
Examples
1. Print Graphic Communication
Newspaper, poster, brochure, billboard
2. Photographic Communication
Photographs, slides, motion pictures
3. Telecommunication
Radio and t.v. broadcasts, computers, mobile and satellite
4. Technical Graphic Communication
Engineering drawings (sketches, drafting, CAD)
Matching Classes
1.
2.
3.
4.
3
1
2,3
2,3
1
2
1
Print Graphic Communication
Photographic Communication
Telecommunications
Technical Graphic Communication
Telephone
Book
Videotape
DVD
Magazine
Photograph
Newspaper
3 Headphones
3 Computer
3 Remote Control
2 Painting
2 Camera
Comic
1,2 Strip
1,2 Billboard
Print Graphic Communication
Communication Technology
– Major Processes:
• Relief
– A modeled work that is raised (or lowered) from a flat
background.
– Cuneiform by the Sumerians ~6000 years ago.
Low Relief
High Relief
Cuneiform
Print Graphic Communication
Communication Technology
– Major Processes:
• Relief
– A modeled work that is raised (or lowered) from a flat
background.
– Cuneiform by the Sumerians ~6000 years ago.
– Wood block printing ~200 C.E.
– Movable type printing ~1040 C.E. (Gutenberg ~1450)
– Rotary printing press ~1843
Print Graphic Communication
Communication Technology
– Major Processes:
• Relief
By 593 A.D., the first printing press was invented in
China, and the first printed newspaper was
available in Beijing in 700 A.D. It was a woodblock
printing. And the Diamond Sutra, the earliest
known complete woodblock printed book with
illustrations was printed in China in 868 A.D. And
Chinese printer Bi Sheng invented movable type in
1041 A.D. in China.
Print Graphic Communication
Communication Technology
– Major Processes:
• Intaglio
Intaglio
(in-tal-yo)
2. The plate is covered in ink
3. Excess ink is removed from
surface
4. Paper placed on plate
and compressed
5. Paper is removed and ink has been transferred
1. Depressions cut
into printing plate
Print Graphic Communication
Communication Technology
– Major Processes:
• Lithography (offset printing) ~1796
–
–
–
–
The source and destination are not on raised surfaces
Grease and water do not readily mix
A chemical process
Most modern books and newspapers
Print Graphic Communication
Communication Technology
• Screen Printing (~1000 C.E., China; 1907 England)
– Mainly billboards, package labels, fabric designs
– Uses a woven mesh (a screen) to support an ink
blocking stencil.
– The stencil forms open areas of mesh that transfer ink
as a sharp-edged image onto a substrate.
– A roller or squeegee is moved across the screen
stencil forcing or pumping ink past the threads of the
woven mesh in the open areas.
• Electrostatic (1938 / 1960s)
– Photocopier, Laser Printer
– Opposite charges attract
• Ink Jet (1980s)
– Use a series of nozzles to spray ink directly on paper
Photographic Communication
Communication Technology
• Photographic Communication
– The process of using photographs to communicate a
message
– Photography – capturing light on a light-sensitive
material such as film or electronic sensor
– As a usable process, 1820s
– Includes photographs, slides, and motion pictures
Communication Technology
• Telecommunication
Telecommunications
– Communicating over a distance
Tele – Greek, “far off”
Communicare – Latin, “to share”
– Rely on the principles of electricity and magnetism
– 2 types:
• Hardwired systems (telephone, cable, fiber-optic)
• Broadcast systems (radio and t.v., mobile phones)
– Point-to-point:
• One transmitter and one receiver
– Broadcast:
• One powerful transmitter to numerous receivers
Communication Technology
Telecommunications
– Smoke signals and drums
– Chains of beacons (Middle Ages)
• Navigation signals
• Enemy troops approaching
– Homing pigeons
• Carrier pigeons used as early as 1150 in Baghdad
• Olympic victors, Greece; Stock options, Europe
Telecommunications
Communication Technology
– Smoke signals and drums
– Chains of beacons (Middle Ages)
• Navigation signals
• Enemy troops approaching
– Homing pigeons
• Carrier pigeons used as early as 1150 in Baghdad
• Olympic victors, Greece; Stock options, Europe
– Optical telegraph (semaphore, 1792, France)
• Towers with pivoting shutters
• Information encoded by the position of the
mechanical elements
Communication Technology
Telecommunications
– Telegraph (mid 1830s)
• First instrument used to send messages by means of wires
and electric current
• A device interrupts the flow of a current through a wire
• Uses shorter and longer bursts of current to represent
letters
• Device at receiving end converted electrical signal into
clicks
• Operator/mechanical printer converted clicks into words
• Telegram – wires over land
• Cable – wires under water
– Telephone (1876 – Bell and Gray)
• Greek: tele – far, phone – sound
Communication Technology
Telecommunications
– Broadcast
• Radio (1893 – Tesla, 1901 – Marconi)
• Television (1925)
– Greek: tele – far, Latin: visio – seeing
– 4 main parts (cathode ray tube)
– Electron gun fires 3 beams
– Steering coils move electron beam across screen
– Phosphorus screen has over 200,000 pixels
– Glass tube holds it all together
– Signals are broadcasted like radio signals
Telecommunications
Communication Technology
– Computers
– Internet
– Cellular
– Local Area Networks
– Satellite Communication
Technical Graphic Communication
Communication Technology
– Engineering Drawing / Technical
Illustration
• Communicates specific information
– Size and shape
– How parts are assembled
– How to install, operate, adjust, maintain a device
• Hand methods
– Sketching
– Drafting
• Computer methods
– CAD (AutoCAD, Sketchup, Inventor, ProEngineer,
etc.)
Telecommunications
ASSIGNMENT 4
– Create a PowerPoint presentation that
documents the history of the development of
the television, internet, and GPS. A few tips for
making good presentations follow. Include
pictures, references, and put everything into
your own words! This assignment can be emailed to the course facilitator. If you cannot
get access to Microsoft PowerPoint (and you
can at school at least), download Open Office
at www.openoffice.org.