AS Level ICT

1
AS Level ICT

• Selection and use of output methods, media, and
  devices Screens, plotters, and speakers

2
Output methods

• Outputs come in a variety of different formats
  including
• Hard copy (e.g. paper printouts)
• On-screen display (e.g. webpage)
• Digital outputs as inputs (e.g. a weather
  stations output is sent in digital form to the
  National Weather Centres computer, where it
  becomes part of the inputs the computer needs to
  track and predict the national weather picture)

3
Output methods

• Digital outputs to portable devices (e.g. files
  saved from a computer onto an IPod or MP3 player)
• Digital outputs as control signals (e.g. computer
  aided manufacture)

4
Output devices

• Outputs devices include
• Printers
• Screens (also called Visual Display Units)
• Plotters
• Speakers and headphones
• Any device that produces output media (e.g. Flash
  drives, removable hard drives, CD-ROMs, CD-RW,
  DVDs)

5
Screens/Visual Display Units

• The first computer screens were based on
  television technology
• They used cathode ray tubes (CRT) to display data
  onscreen, and were large and cumbersome
• They are now being replaced by liquid crystal
  display (LCD) screens which are lighter, easier
  to use, and are capable of higher screen
  resolution

6
Screens/Visual Display Units
Cathode Ray Tube (CRT) monitor
Liquid Crystal Display (LCD) monitor
7
Plotters

• Plotters are specially optimised to produce
  technical graphics (e.g. graphs, plans, maps, and
  designs)
• They use special pen-like heads to draw the
  output
• There are two main types of plotter
• Flatbed potters suitable for producing small
  scale technical drawings
• Drum plotters suitable for producing large
  drawings

8
Plotters
Flatbed plotter
Drum plotter
9
Speakers and headphones

• Speakers and headphones are central to any
  multimedia system
• Audio output is integral to video, watching
  television or listening to radio via a webcast,
  multimedia presentations, websites, and
  interactive learning packages

10
AS Level ICT

• Selection and use of output methods, media, and
  devices Screens, plotters, and speakers