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  • Created by: luiop100
  • Created on: 14-03-16 11:49


Data types

  • Text

  • images

  • moving images

  • numbers

  • sounds

Manual input

  • Have to physically input all data

  • Keyboard:

    • Typically QWERTY

    • has keys for each letter, as well as special keys i.e. ESC

    • The layout of the keyboard varies from country to country

    • Ergonomic keyboards have been created to reduce injuries such as RSI (repetitive strain injury)

    • The downfall of ergonomics is people being reluctant to change to it from a regular keyboard.

    • Mobile devices have smaller keyboards called keypads, since a full sized keyboard would not be practical.

  • Mouse:

    • Most common pointing device

    • Connected via a cable or wirelessly

    • Two different types, optical and mechanical

    • A mechanical mouse has a rolling ball which senses movement on a flat surface

    • An optical mouse uses a light sensor to detect motion

    • Most mice will have 2-3 buttons

    • A trackball, is like a mouse by has a ball on the surface not underneath, the ball is moved using the fingers or the palm

    • Laptops usually have a trackpad

    • A trackpoint is a small button that works like a joystick

  • Touch-sensitive devices rely on touch for data input

  • Concept Keyboard:

    • Divided into areas to fit the purpose

    • Special software is required to interpret the keys pressed

    • useful at check outs and restaurants, to simplify paying, clicking on an icon or word rather than remembering a price

    • Often covered in plastic film to protect it from getting dirty

    • Also used as input for those with disabilities

  • Touch screens:

    • Senses when an area of the screen is being touched, using embedded wires or infra-redlight beams.

    • Special software is needed to interpret the signals

    • Often used in public areas because they are easy to use and combine input and output.

    • A finger or a stylus can be used to select items, draw or write.

    • Often there is software that can convert written text into characters, and it can be trained to recognise the handwriting of a particular user.

  • Graphics Tablet:

    • Also known as digitizing tables

    • Used mainly for drawing

    • A stylus draws on a flat plate

    • More natural than using a mouse

    • An example is an interactive whiteboard that can be written on using pens and allows for objects to be moved around the screen using fingers.

  • Speech Recognition:

    • Involves the user speaking into a microphone

    • Words are compared to a sound dictionary and converted into readable text

    • Not very reliable due to different voices and accents

    • Complicated by words that sound the same but mean different things i.e there, their and they’re.

    • Functions better if each word is said separately and clearly but this makes the process last longer.

Automatic Input

  • Input devices that read data from media that already have data stored on them. This can either be stored magnetically or on paper and then interpreted.

  • Credit Card reader:

    • two main ways of storing data, a magnetic strip card or a smart card ( Chip-and-PIN)

    • Magnetic strip cards are swiped through a reader,


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