In your studies so far, you have looked at many information systems and you have produced projects either as an individual or in groups. We will now look at multimedia systems. Before we can create a multimedia system from an information system, we need to look at what a multimedia system is and how it is made up.
This material addresses aspects of the following syllabus outcomes:
H1.1 applies and explains an understanding of the
nature and function of information technologies to a specific practical situation.
H2.2 develops and explains solutions for an identified need which addresses all of the information processes.
H4.1 proposes and justifies ways in which information systems will meet emerging needs.
Source: Board of Studies NSW, Stage 6 Information Processes and Technology,Preliminary and HSC Courses (2007)
The term multimedia refers to a variety of differing characteristics that make up a presentation of some type. These presentations will use all the characteristics in order to made a multimedia system.
Multimedia Sample ( PowerPoint file- 1 slide)
In order to achieve any multimedia system, the following characteristics are important.
Let me in (wav file)
This is the sound that has been captured and converted from a sound wave (analog) into a digital form. Consideration needs to be given as to the use of audio, as the file is usually very large and will need to be compressed. Information technology required for audio is varied, but audio can be captured mainly through a microphone and recorded onto the hard drive of your PC. Once there, the audio is modified and added into the multimedia system.
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Images are either vector or bit-mapped images. Vector graphics use reference points that draw lines between two points. This enables memory to save the images much more effectively, as the frame buffer has to hold the information for only 2 sets of coordinates. Bit-mapped graphics take up more space in memory however; a more detailed shape can be drawn in this form of graphic. File compression will be needed in order to store the images in bit-mapped graphics. These images, which could include a photo, are said to be “static” or motionless.
Animations are images that appear to move. There are two types of animation.
Using video in multimedia systems enables moving images in real-time to be displayed to enhance the text, audio and other graphics images. Video is used to add extra meaning to the other characteristics. An example of this is in encyclopaedias, where video clips are inserted that reflect the content of the other features of the section displayed.
Hyperlinks and buttons are frequently employed to activate video within the presentation or navigate to another page or site.