IOT POLY ENGINEERING 2-2 DRILL October 11, 2010 LIST THE FOUR CATEGORIES OF COMMUNICATION (Example Human to Human) AND GIVE AN EXAMPLE of EACH

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 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 16 lbs per year

IOT POLY ENGINEERING 2-1 Types of Communication Technologies Printed Graphic Communication:Photographic Communication: Telecommunication Technical Graphic Communication:

IOT POLY ENGINEERING 2-1 – 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 – Feedback and Control Reversing the communication line Communication Technology Not always

IOT POLY ENGINEERING 2-1 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.

IOT POLY ENGINEERING 2-2 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] Destination: Consumers’ ears and eyes ASSIGNMENT 2 – Example

IOT POLY ENGINEERING 2-1 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 Communication Technology

IOT POLY ENGINEERING 2-1 Communication Technology Tin Can Telephone Encoder-1 st tin can – Sound energy is converted to mechanical energy Transmitter – wire between strings – Mechanical energy is transferred to second can Receiver – 2 nd tin can – Mechanical energy of wire is converted to vibrations of tin can. Decoder – 2 nd tin can – Vibrations of second tin is converted into sound energy.

IOT POLY ENGINEERING 2-1 Communication Technology Landline Telephones Encoder-Microphone in first handset Transmitter – Copper wires to central location and then to destination Receiver – 2 nd telephone Decoder – Speaker in second handset

IOT POLY ENGINEERING 2-1 Communication Technology Cellular Telephones Encoder-Microphone in first handset Transmitter – 1 st telephone sends radio signal to cellular tower. Tower sends radio signal to 2 nd telephone Receiver – 2 nd cell phone Decoder – Speaker in second handset

IOT POLY ENGINEERING 2-1 Communication Technology Transmission of Radio Signal Sine wave contains no information. We need to modulate (vary) it. Problem:

IOT POLY ENGINEERING 2-1 Communication Technology Transmission of Radio Signal Voice Patterns

IOT POLY ENGINEERING 2-2 Pulse Modulation: turn the voltage (sine wave) on/off (Morse Code) Amplitude Modulation: vary the amplitude (peak-to-peak) voltage Frequency Modulation: vary the frequency (speed) PM AM FM

IOT POLY ENGINEERING 2-2 Digital vs Analog AnalogDigital

IOT POLY ENGINEERING 2-2 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

IOT POLY ENGINEERING 2-2 Morse Code Communication

IOT POLY ENGINEERING 2-2 Listening to Aliens We are looking at aliens by examining electromagnetic spectrum Scientists use radio telescopes to analyze if any messages seem to be unnatural

IOT POLY ENGINEERING 2-2 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

IOT POLY ENGINEERING 2-2 The Message

IOT POLY ENGINEERING 2-2 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