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Selection & Use of Input devices and media

Selection & Use of Input devices and media. AQA INFO 1 Section 4. Input Devices. When devising an IT solution to a problem, you need to consider how the users will input data to the computer. Key board Mouse. Scanners. Scanners can be used to input an image

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Selection & Use of Input devices and media

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  1. Selection & Use of Input devices and media AQA INFO 1 Section 4 tcowling 2009 from Mott, Leaming & Williams

  2. Input Devices • When devising an IT solution to a problem, you need to consider how the users will input data to the computer. • Key board • Mouse tcowling 2009 from Mott, Leaming & Williams

  3. Scanners • Scanners can be used to input an image • Pictures stored in different formats • .bmp & .jpeg etc • Useful for printed hard copies • Depends on clarity of original handwriting or paper tcowling 2009 from Mott, Leaming & Williams

  4. Digital Cameras • Connects via a USB port or memory card • Images can be downloaded and stored • Useful for modifying images [red eye] • Need accompanying software as well tcowling 2009 from Mott, Leaming & Williams

  5. Touchpads • Rectangular pad on laptop • Touch sensitive by use of the finger • Acts as a mouse • Don’t need to carry an additional mouse • Not often as easy to use as a mouse tcowling 2009 from Mott, Leaming & Williams

  6. Optical Character Recognition [OCR] • Device recognises characters by light sensing methods • EG Post Office address reader system or car number plate readers on speed cameras • Easy to store information quickly • Close match is not always the correct match tcowling 2009 from Mott, Leaming & Williams

  7. Optical Mark Recognition [OMR] • Mark sensing on pre-printed documents • Contain boxes which indicate choices marked using carbon • Avoids human keyboard entry • Forms need to be un-creased to work properly tcowling 2009 from Mott, Leaming & Williams

  8. Magnetic Ink Character Recognition[MICR] • Pre-printed with character data in special ink that is magnetised. • Almost used exclusively to read cheques • Minimises fraud • Needs expensive equipment tcowling 2009 from Mott, Leaming & Williams

  9. Bar Code Readers • Means of identifying items with a unique product code • Read using light and encoded into a readable format • Read quickly with few mistakes • Expensive equipment needed tcowling 2009 from Mott, Leaming & Williams

  10. Speech Recognition • Enable large quantities of data to be input as words verbally • Useful when using hands is not an option [factory/user etc] • User must speak clearly with little variation in dialect tcowling 2009 from Mott, Leaming & Williams

  11. Which input device to use & when tcowling 2009 from Mott, Leaming & Williams

  12. Summary • Automatic input methods remove need to key in data • Large quantities of data to be read/input quickly • Range of different methods • Keyboard • OCR • OMR • MICR • Bar code scanning • Speech Recognition • Number of factors considered when choosing an input method • Volume of data • Cost • Speed • Ease of Use tcowling 2009 from Mott, Leaming & Williams

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