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(a)Explain why sound is important in
a multimedia presentation.[1 mark ]
Sound greatly complements images,videos,and computer-generated animations,
providing a richer experience for the reader (1).
(b)There are four ways
in which sound elements can be used in a multimedia
presentation.State each one, and for each, provide an appropriate
application
example.[8 marks ]
• To reinforce a message or theme (1).In order to sell an ocean
front property to a client you may need to add ocean sounds to a presentation
in order to better present the images in your presentation.(1)
• To set the mood (1). If you are advertising an expensive restaurant,
soft gentle music will set the mood for a quiet evening. If you are
describing the activities in a water-park, lively music will indicate
a mood of energy and action (1).
• To catch he interest of and alert the audience (1).Ifyou are
presenting
information about the financial status of a company, a noise to attract
the
attention of the audience when the final figures are presented will
let he audience know that this is the important part of the presentation
(1).
• To include narration effectively in training and educational
applications (1).If you are presenting instructions on how to use
a washing machine, a voice-over can clearly state the instructions,
and identify he steps that need to be taken.(1)
(c)As you plan to integrate
video into your multimedia application, there are four main parameters
that you must consider to achieve the most effective result: [6 marks
]
• Data transfer rate of the storage media
• Video window size
• Video frame rate
• Image quality and resolution
Choose any three of these, describe them, and explain why they are
important to the quality of your product.
• data transfer rate of the storage media is the speed at which
information can be retrieved from the storage mechanism (1).The faster
the data transfer, the faster the playback and he smoother the video
motion will look (1).
• window size is the number of pixels that will be displayed
horizontally and vertically (1).The smaller he window size, the smaller
the file,and the faster the information can be transferred and processed
(1)
• frame rate is the number of frames displayed per second during
playback (1).The lower the frame rate, the faster the data can be
processed, and the smaller the storage required for the file –but
there will be a jerky motion if the frame rate is too low (1).
• image quality is the bit depth of the information captured
per frame (1). A low bit depth means less colours, but increases the
transfer rate (1). (Maximum 6 marks from any three of the above points)
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