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Multimedia Systems

Terminology in MMS

TermDefinition
Multimedia system It uses at least three media types, such as text, images, animation, audio and video.
Hypertext It is a system that allows documents to be cross-linked in such a way that the user can move from one document to another by clicking on a link.
Bit-mapped graphics or Raster graphics Treat each pixel on the screen individually and represent this by bits in memory.
Vector graphics Are made up of objects, such as a straight line, a curve, or a shape.
Interactivity Allows the user to choose the sequence and content of information.
Print media Provides a limited form of linear interactivity.
Bit depth Is the number of bits per pixel that is stored.
Analogue data Is represented by continuous variable quantities such as sound waves or radio waves.
Digital data Is represented in the form of digits or numbers(01100100) and can be processed by a computer.
Sample rate The number of times a sample (slice) is taken from the sound wave.
Sampling The method used by the ADC to digitise a sound wave is called:
Sample size Is the number of bits stored per sample.
Stereo sound Uses two channels (left and right).
Frame rate The speed of a video or animation.
Cel-based animation Involves drawing and displaying individual frames or cells.
Path-based animation Involves displaying the movement of objects onto a fixed background in a particular sequence or path.
Morphing An animation technique that involves for the smooth change between two different images.
Warping An animation technique that involves transforming or distorting a portion of the image.
Virtual Reality The use of computer modelling and simulation to enable a person to interact with an artificial environment.
Information kiosks Allow people to use a touch screen and select information about an organisation or service.
Flight simulators Are used to train pilots. The external effects, such as changing weather conditions, require high-resolution images and the ability to control different aspects of the system.
Head-up displays Are devices worn on the head to display information.
Presentation software Is used to make a professional presentation to a group of people.
HTML editor Is a software program that specialises in writing HTML code.
Authoring software The software allows the user to bring together the separate media types- no need for extensive HTNL knowledge.
A storyboard Is a series of frames each representing a different action or screen image.
A linear storyboard layout A simple sequential path that is set up quickly such as PowerPoint and Books.
A hierarchical storyboard layout A sequential path in a top-down design in which the user starts at the beginning and moves down through the multimedia product.
A non-linear story board layout No structure; the user moves between different layouts in any direction
Compression Reduces the number of bits required to represent information. It allows the user to store more data and makes data transfer faster.
Lossy compression Removes a number of data bytes from the file.The resulting file is smaller in size but the quality is reduced.
Lossless compression Allows the original file to be recovered in full. It works by replacing repeated data with something that takes up less room.
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