Download Oct 13- Communications 2

DRILL October 11, 2010
LIST THE FOUR CATEGORIES OF COMMUNICATION
(Example Human to Human) AND GIVE AN
EXAMPLE of EACH
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POLY ENGINEERING
Bookwork Problems
Pass in assignment on the soda problem assigned
last Wednesday
Define the key terms on page 372. Answer the 15
“Test your Knowledge” Questions on page 372.
This is classwork that will turned in.
This is a silent, individual assignment. Talking will
result in serving after school detention.
1)Estimate how much soda the American
population drinks in a year
2)If a can of Coca-Cola is 150 calories and
there are 3,500 calories in a pound of body
mass, what is the average weight gain of
an American in a calendar year due to
drinking soda?
Soda Problem 1
• I would estimate on average Americans drink one
cans of coke everyday. Some drink more than
two, some drink none but a reasonable average is
1 can/day
1can soda
365days 1.5 cups 1gallon 300 *106 people
*
*
*
*
person everyday
year
1can
8cups
United States
• 20 billion gallons of soda every year
• Actual answer is 15 billion
Soda Problem 2
• If the average American drinks 1 can of soda
per day
1can soda 365days 150calories
1lb
*
*
*
day
year
can
3500calories
• 16 lbs per year
Types of Communication
Technologies
Telecommunication
Printed Graphic
Technical
Communication:
Graphic
Photographic
Communication:
Communication:
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Communication Technology
– Goals
Inform Persuade Entertain Control Manage Educate
– Inputs
Source of Communication
– Processes (in this order)
Encoder Transmitter Receiver Decoder Storage Retrieval
– Outputs
Message to the destination
Not always
– Feedback and Control
Reversing the communication line
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ASSIGNMENT 2
Example Follows
LETTER THIS ASSIGNMENT
Radio, T.V., Cell Phone, Internet, GPS, Remote Control
For the 6 above technologies analyze the components
(the goal, source, encoder, transmitter, receiver,
decoder, storage, retrieval, and destination). You
will need to research the devices in order to
complete this assignment. Provide references.
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ASSIGNMENT 2 – Example
Radio:
Goal: Inform
Persuade
Entertain
Control
Manage
Educate
Source: Sounds and Information
Encoder: Devices convert sound and info into modulated sine waves
Transmitter: Antennas radiate the radio waves into air (medium)
Receiver: Antennas capture the radio waves from air
Decoder: Devices convert radio waves back into sounds and data
[Storage: Recording devices store sounds and data for playback]
[Retrieval: Stored data can be accessed and played]
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Destination: Consumers’ ears and eyes
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Communication Technology
•
Encoder
– A device that changes a message into a form that can
be transmitted
•
Transmitter
– A device that sends a signal (i.e., encoded message)
•
Receiver
– A device that acquires a signal (i.e., encoded message)
•
Decoder
– A device that changes a coded message into an
understandable form
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Communication Technology
Tin Can Telephone
•
Encoder-1st tin can
–
•
Transmitter – wire between strings
–
•
Mechanical energy is transferred to second can
Receiver – 2nd tin can
–
•
Sound energy is converted to mechanical energy
Mechanical energy of wire is converted to vibrations of tin can.
Decoder –
–
2nd
tin can
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Vibrations of second tin is converted into sound energy.
Communication Technology
Landline Telephones
•
•
•
•
Encoder-Microphone in first handset
Transmitter – Copper wires to central location and then
to destination
Receiver – 2nd telephone
Decoder – Speaker in second handset
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Communication Technology
Cellular Telephones
•
•
•
•
Encoder-Microphone in first
handset
Transmitter – 1st telephone
sends radio signal to cellular
tower. Tower sends radio
signal to 2nd telephone
Receiver – 2nd cell phone
Decoder – Speaker in second
handset
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Communication Technology
Transmission of Radio Signal
Problem:
Sine wave contains no information.
We need to modulate (vary) it.
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Communication Technology
Transmission of Radio Signal
Voice Patterns
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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
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Digital vs Analog
Analog
Digital
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Digital vs Analog
• Advantages of digital
– Store large amounts of
information
– Retrieve large amounts
of information
• Disadvantages of digital
– Lose information
– Can only store using
binary numbers
• On/Off
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Morse Code Communication
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Listening to Aliens
We are looking at aliens by Scientists use radio
examining electromagnetic telescopes to analyze if any
spectrum
messages seem to be
unnatural
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Talking to Aliens
• In 1974 Scientists sent a
deliberate message
– 25,000 light years away
– 1679 bits of information
• 23 columns
• 78 rows
– Frequency of 2380 MHz
– 10 bits/second
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The Message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00000001011000001100110000000110011000010001010000010100010000100010010001
0010001000000001000101000100000000000010000100001000000000000100000000010
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0000000000000100101000000000001111001111101001111000
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Message to Aliens
Numbers from 1 to 10
Atomic Numbers for Hydrogen, Carbon,
Nitrogen, Oxygen, and Phosphorous
DNA Bases and Sugars
DNA Structure
Picture of man and population of earth
Solar System
Arecibo Telescope
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