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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

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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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    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 Presentation Transcript

    • Selection and use of output methods, media and devices INFO 1 – Unit 6
    • Selection and use of output methods, media and devices
    • Output devices Output devices present the information to the user
      • Output devices allow the computer system to provide the user with the results of processing the data.
      • The particular application may require this to be in permanent form or the information may be temporarily displayed on a screen.
      • The following factors will need to be considered when selecting an output device.
        • Whether or not a permanent copy is required.
        • Medium to be used (screen , paper, sound etc.)
        • Initial cost of hardware.
        • Running costs - consumables and maintenance.
        • Speed at which output is produced.
        • Quality or resolution of output.
        • Working environment - size of and noise produced by the hardware.
    • Output devices Output devices present the information to the user
      • Monitors
        • There are the following types of monitors to choose from:
          • 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.
          • CRT (Cathode Ray Tube) – commonly used in desktop displays
          • TFT (Thin Film Transistor) – a type of LCD flat panel display screen.
        • 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.
        • SVGA (Super Video Graphics Array) – provides greater resolution, a larger colour palette and faster refresh rate.
        • 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.
    • Output devices Output devices present the information to the user
      • Projectors
        • Projects the computer output onto a large screen.
        • They are commonly used when giving presentations or demonstrations, along with a white screen or interactive whiteboard.
        • Prices are continuing to fall and quality is improving
        • Pros
          • Used to present to large audiences
          • Increase the size of the display
        • Cons
          • Can be expensive for high quality devices
          • External/Internal light reflection can effect quality of image presented (New Devices are combating this issue)
    • Output devices Output devices present the information to the user
      • Printers
        • Various types of printers are suitable for different tasks.
        • Things to consider with printers are:
          • the resolution
          • Speed
          • compatibility (e.g. the need for printer drivers )
          • use of consumables (toner/ink/ribbon)
          • paper handling qualities
          • Robustness - ( The degree to which a component can still function in the presence of partial failures)
        • A printer driver is required in order to use the printer
          • A printer driver is a software routine which stores the setup/page configuration for a particular model of printer
          • A printer drivers function is to:
            • Provide interface/communication between the operating system/ computer/ application package and the printer
            • Translate formatting and highlighting information into a form that the printer can understand
    • Output devices Output devices present the information to the user
      • Printers
      • Dot Matrix
        • Have a number of pins which strike the paper through a printer ribbon similar to a typewriter ribbon.
        • Pros
          • Cheap
          • Reliable
          • Used when output is printed onto carbonated paper
        • Cons
          • Letters look rough as they are made out of visible dots
          • Noisy
          • Slow
    • Output devices Output devices present the information to the user
      • Printers
      • Ink-Jet
        • Have tiny nozzles filled with ink from a cartridge
        • The nozzles are heated causing a tiny bubble of ink to touch the paper, thus printing
        • Pros
          • Quality of print is better than dot matrix
          • Some ink jet printers can out perform laser printers
          • The Printer is usually cheap*
        • Cons
          • Slower than laser printers
          • Do not cope well with large volumes of printing
          • *Becomes expensive when cartridges are taken in to account
    • Output devices Output devices present the information to the user
      • Printers
      • Laser
        • A laser and mirror is used to “paint” light on a rotating drum
        • The drum is covered by a film of zinc oxide which becomes electronically charged by the light
        • The laser is turned on and off to paint the correct pattern of the drum.
        • The charged areas pick up black powder from the print cartridge
        • The toner is deposited on the paper and is fixed by heat
        • Pros
          • Quick
          • Produce high quality printouts
          • They perform well when dealing with volume printing
        • Cons
          • The printers are usually expensive
          • The toner cartridges are expensive (each cartridge does have a high capacity)
    • Output devices Output devices present the information to the user
      • Printers
      • Plotters
        • Specialised printers usually used to produce copies which are A1 or larger.
        • They are used to create technical printouts such as those used by engineers or architects.
        • There are two different types of plotters a Flatbed and a Drum Plotter both work in different ways
        • Pros
          • The quality of output is very high
          • Can print larger than A3
        • Cons
          • Initial purchase price is high and running costs are moderate.
          • Slow
    • Output devices Output devices present the information to the user
      • Printers
      • Thermal Transfer
        • Non-impact printer.
        • Uses heat to heat to make an impression on paper.
        • Used to print barcodes, price tags and labels, mobile POS (receipt or ticket printing)
        • Found in restaurants
        • Pros
          • Quiet
          • Small
          • Cheap to maintain (runs off battery)
        • Cons
          • Quality is limited to size
          • Tends to be only black and white prining
    • Output devices Output devices present the information to the user
      • Printers
      • Dye-Sublimation
        • Used to produces excellent colour reproduction e.g. printing Art work
        • Pros
          • Excellent Quality
        • Cons
          • Purchase price high
          • Consumables high
    • Output devices Output devices present the information to the user
      • Printers
      • 3D Printer
        • Consider
          • Uses of
          • Function (How does it work?)
          • Practicality (Size, materials required)
          • Cost (Initial and maintenance)
          • Quality of output
          • Limitations
            • "It doesn'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't do for itself - but it prints out a lot of the rest.“
              • Dr Adrian Bowyer from the University of Bath ( http://www.bbc.co.uk/news/technology-11834044 )
          • Ethics
            • 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 "working to defend citizens' rights in the emerging digital culture" referred to the advancements as the "next great technological disruption”
      http://printo3d.com/
    • Output devices Output devices present the information to the user
      • Speakers
        • Commonly use to output sound e.g.
          • Music
          • Audible warnings
          • Loading
          • Shutting Down
    • Output devices Output devices present the information to the user
      • Headsets
        • Combination of an input device and an output device
        • Development of VoIP has increased their use
        • Also often used in gaming
    • Output devices Output devices present the information to the user
      • Speech Synthesis
        • Speech synthesis is the artificial production of human speech.
        • A system used for this purpose is termed a speech synthesizer
        • Speech synthesis systems are often called text-to-speech (TTS) systems in reference to their ability to convert text into speech.
        • It is an expanding area of output, common in a range of applications including computer games.
        • 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.