Cork Institute of Technology
Higher Certificate in Science in Computing in Information
Technology Support – Award
(NFQ Level 6)
Autumn 2007
Multimedia
(Time: 3 Hours)
Instructions
Answer Question 1 and THREE other questions
All questions carry equal marks.
Examiners: Mr. J. Greenslade
Mr. J. Walsh
Mr. C.E. Manning
Q1. (25 marks)
A Macromedia Director movie has a slider in sprite 6 to control the volume of the sound in channel
2. The registration point of the slider is bounded so that it can only move up and down within the
boundary of sprite 12, and not from left to right. As the slider moves up on the screen the volume
increases and as it moves down the volume decreases. At maximum volume the slider is 300 pixels
from the top of the stage. At minimum volume (silent) the slider is 400 pixels from the top of the
stage.
The volume is controlled by a frame script that uses the position of the slider to modify the volume
level.
Write the lingo code for the frame script.
Q2. (25 marks)
Part A (10 marks)
MPEG uses three kinds of frame. I-frames, P-frames, and B-frames. Briefly describe the kind of
compression used by each frame and the dependancies between the frames.
Part B (8 marks)
Using a diagram describe a typical group of (not less than 12) frames.
Part C (5 marks)
What does it mean when a compression algorithm is said to be symmetrical?
Part D (2 marks)
Is MPEG symmetrical or asymmetrical?
