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INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
INFO 1 unit 1.6 - Selection and use of output methods, media and devices
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INFO 1 unit 1.6 - Selection and use of output methods, media and devices

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Theory presentation on AQA INFO 1 unit 1.6 Selection and use of output methods, media and devices

Theory presentation on AQA INFO 1 unit 1.6 Selection and use of output methods, media and devices

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  • 1. Selection and use of output methods, media and devices INFO 1 – Unit 6
  • 2. Selection and use of output methods, media and devices
  • 3. Output devices Output devices present the information to the user <ul><li>Output devices allow the computer system to provide the user with the results of processing the data. </li></ul><ul><li>The particular application may require this to be in permanent form or the information may be temporarily displayed on a screen. </li></ul><ul><li>The following factors will need to be considered when selecting an output device. </li></ul><ul><ul><li>Whether or not a permanent copy is required. </li></ul></ul><ul><ul><li>Medium to be used (screen , paper, sound etc.) </li></ul></ul><ul><ul><li>Initial cost of hardware. </li></ul></ul><ul><ul><li>Running costs - consumables and maintenance. </li></ul></ul><ul><ul><li>Speed at which output is produced. </li></ul></ul><ul><ul><li>Quality or resolution of output. </li></ul></ul><ul><ul><li>Working environment - size of and noise produced by the hardware. </li></ul></ul>
  • 4. Output devices Output devices present the information to the user <ul><li>Monitors </li></ul><ul><ul><li>There are the following types of monitors to choose from: </li></ul></ul><ul><ul><ul><li>LCD (Liquid Crystal Display) – commonly used fro laptop computers because they have low power consumption. They are lighter than CRT displays and have a flat profile. </li></ul></ul></ul><ul><ul><ul><li>CRT (Cathode Ray Tube) – commonly used in desktop displays </li></ul></ul></ul><ul><ul><ul><li>TFT (Thin Film Transistor) – a type of LCD flat panel display screen. </li></ul></ul></ul><ul><ul><li>VGA (Video Graphics Array) – a graphics display system for PC’s developed by IBM – Provides a resolution up to 640x480 and a palette of 256 colours. </li></ul></ul><ul><ul><li>SVGA (Super Video Graphics Array) – provides greater resolution, a larger colour palette and faster refresh rate. </li></ul></ul><ul><ul><li>The resolution of a monitor indicates how densely packed the pixels are. In general, the more pixels (often expressed in dots per inch), the sharper the image. </li></ul></ul>
  • 5. Output devices Output devices present the information to the user <ul><li>Projectors </li></ul><ul><ul><li>Projects the computer output onto a large screen. </li></ul></ul><ul><ul><li>They are commonly used when giving presentations or demonstrations, along with a white screen or interactive whiteboard. </li></ul></ul><ul><ul><li>Prices are continuing to fall and quality is improving </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>Used to present to large audiences </li></ul></ul></ul><ul><ul><ul><li>Increase the size of the display </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>Can be expensive for high quality devices </li></ul></ul></ul><ul><ul><ul><li>External/Internal light reflection can effect quality of image presented (New Devices are combating this issue) </li></ul></ul></ul>
  • 6. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><ul><li>Various types of printers are suitable for different tasks. </li></ul></ul><ul><ul><li>Things to consider with printers are: </li></ul></ul><ul><ul><ul><li>the resolution </li></ul></ul></ul><ul><ul><ul><li>Speed </li></ul></ul></ul><ul><ul><ul><li>compatibility (e.g. the need for printer drivers ) </li></ul></ul></ul><ul><ul><ul><li>use of consumables (toner/ink/ribbon) </li></ul></ul></ul><ul><ul><ul><li>paper handling qualities </li></ul></ul></ul><ul><ul><ul><li>Robustness - ( The degree to which a component can still function in the presence of partial failures) </li></ul></ul></ul><ul><ul><li>A printer driver is required in order to use the printer </li></ul></ul><ul><ul><ul><li>A printer driver is a software routine which stores the setup/page configuration for a particular model of printer </li></ul></ul></ul><ul><ul><ul><li>A printer drivers function is to: </li></ul></ul></ul><ul><ul><ul><ul><li>Provide interface/communication between the operating system/ computer/ application package and the printer </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Translate formatting and highlighting information into a form that the printer can understand </li></ul></ul></ul></ul>
  • 7. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>Dot Matrix </li></ul><ul><ul><li>Have a number of pins which strike the paper through a printer ribbon similar to a typewriter ribbon. </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>Cheap </li></ul></ul></ul><ul><ul><ul><li>Reliable </li></ul></ul></ul><ul><ul><ul><li>Used when output is printed onto carbonated paper </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>Letters look rough as they are made out of visible dots </li></ul></ul></ul><ul><ul><ul><li>Noisy </li></ul></ul></ul><ul><ul><ul><li>Slow </li></ul></ul></ul>
  • 8. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>Ink-Jet </li></ul><ul><ul><li>Have tiny nozzles filled with ink from a cartridge </li></ul></ul><ul><ul><li>The nozzles are heated causing a tiny bubble of ink to touch the paper, thus printing </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>Quality of print is better than dot matrix </li></ul></ul></ul><ul><ul><ul><li>Some ink jet printers can out perform laser printers </li></ul></ul></ul><ul><ul><ul><li>The Printer is usually cheap* </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>Slower than laser printers </li></ul></ul></ul><ul><ul><ul><li>Do not cope well with large volumes of printing </li></ul></ul></ul><ul><ul><ul><li>*Becomes expensive when cartridges are taken in to account </li></ul></ul></ul>
  • 9. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>Laser </li></ul><ul><ul><li>A laser and mirror is used to “paint” light on a rotating drum </li></ul></ul><ul><ul><li>The drum is covered by a film of zinc oxide which becomes electronically charged by the light </li></ul></ul><ul><ul><li>The laser is turned on and off to paint the correct pattern of the drum. </li></ul></ul><ul><ul><li>The charged areas pick up black powder from the print cartridge </li></ul></ul><ul><ul><li>The toner is deposited on the paper and is fixed by heat </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>Quick </li></ul></ul></ul><ul><ul><ul><li>Produce high quality printouts </li></ul></ul></ul><ul><ul><ul><li>They perform well when dealing with volume printing </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>The printers are usually expensive </li></ul></ul></ul><ul><ul><ul><li>The toner cartridges are expensive (each cartridge does have a high capacity) </li></ul></ul></ul>
  • 10. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>Plotters </li></ul><ul><ul><li>Specialised printers usually used to produce copies which are A1 or larger. </li></ul></ul><ul><ul><li>They are used to create technical printouts such as those used by engineers or architects. </li></ul></ul><ul><ul><li>There are two different types of plotters a Flatbed and a Drum Plotter both work in different ways </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>The quality of output is very high </li></ul></ul></ul><ul><ul><ul><li>Can print larger than A3 </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>Initial purchase price is high and running costs are moderate. </li></ul></ul></ul><ul><ul><ul><li>Slow </li></ul></ul></ul>
  • 11. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>Thermal Transfer </li></ul><ul><ul><li>Non-impact printer. </li></ul></ul><ul><ul><li>Uses heat to heat to make an impression on paper. </li></ul></ul><ul><ul><li>Used to print barcodes, price tags and labels, mobile POS (receipt or ticket printing) </li></ul></ul><ul><ul><li>Found in restaurants </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>Quiet </li></ul></ul></ul><ul><ul><ul><li>Small </li></ul></ul></ul><ul><ul><ul><li>Cheap to maintain (runs off battery) </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>Quality is limited to size </li></ul></ul></ul><ul><ul><ul><li>Tends to be only black and white prining </li></ul></ul></ul>
  • 12. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>Dye-Sublimation </li></ul><ul><ul><li>Used to produces excellent colour reproduction e.g. printing Art work </li></ul></ul><ul><ul><li>Pros </li></ul></ul><ul><ul><ul><li>Excellent Quality </li></ul></ul></ul><ul><ul><li>Cons </li></ul></ul><ul><ul><ul><li>Purchase price high </li></ul></ul></ul><ul><ul><ul><li>Consumables high </li></ul></ul></ul>
  • 13. Output devices Output devices present the information to the user <ul><li>Printers </li></ul><ul><li>3D Printer </li></ul><ul><ul><li>Consider </li></ul></ul><ul><ul><ul><li>Uses of </li></ul></ul></ul><ul><ul><ul><li>Function (How does it work?) </li></ul></ul></ul><ul><ul><ul><li>Practicality (Size, materials required) </li></ul></ul></ul><ul><ul><ul><li>Cost (Initial and maintenance) </li></ul></ul></ul><ul><ul><ul><li>Quality of output </li></ul></ul></ul><ul><ul><ul><li>Limitations </li></ul></ul></ul><ul><ul><ul><ul><li>&amp;quot;It doesn&apos;t print every last single part. There are some which, at the moment, are a little bit difficult for the machine to manage - so things like electric motors and the electronics circuitry the machine can&apos;t do for itself - but it prints out a lot of the rest.“ </li></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Dr Adrian Bowyer from the University of Bath ( http://www.bbc.co.uk/news/technology-11834044 ) </li></ul></ul></ul></ul></ul><ul><ul><ul><li>Ethics </li></ul></ul></ul><ul><ul><ul><ul><li>In the past, the ability to print, burn CDs or DVDs have been seen as a serious threat to intellectual property, making the act of piracy easier. 3D printing is no different. Public Knowledge, a Washington-based public interest group &amp;quot;working to defend citizens&apos; rights in the emerging digital culture&amp;quot; referred to the advancements as the &amp;quot;next great technological disruption” </li></ul></ul></ul></ul>http://printo3d.com/
  • 14. Output devices Output devices present the information to the user <ul><li>Speakers </li></ul><ul><ul><li>Commonly use to output sound e.g. </li></ul></ul><ul><ul><ul><li>Music </li></ul></ul></ul><ul><ul><ul><li>Audible warnings </li></ul></ul></ul><ul><ul><ul><li>Loading </li></ul></ul></ul><ul><ul><ul><li>Shutting Down </li></ul></ul></ul>
  • 15. Output devices Output devices present the information to the user <ul><li>Headsets </li></ul><ul><ul><li>Combination of an input device and an output device </li></ul></ul><ul><ul><li>Development of VoIP has increased their use </li></ul></ul><ul><ul><li>Also often used in gaming </li></ul></ul>
  • 16. Output devices Output devices present the information to the user <ul><li>Speech Synthesis </li></ul><ul><ul><li>Speech synthesis is the artificial production of human speech. </li></ul></ul><ul><ul><li>A system used for this purpose is termed a speech synthesizer </li></ul></ul><ul><ul><li>Speech synthesis systems are often called text-to-speech (TTS) systems in reference to their ability to convert text into speech. </li></ul></ul><ul><ul><li>It is an expanding area of output, common in a range of applications including computer games. </li></ul></ul><ul><ul><li>If you phone up directory enquiries or the speaking clock, you will be told the number you require or the time by the computer in synthesised speech. </li></ul></ul>

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