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Multimedia Systems And Applications(Cisy 426) Question Paper
Multimedia Systems And Applications(Cisy 426)
Course:Computer Information Systems And Business Information Technology
Institution: Kenya Methodist University question papers
Exam Year:2012
TIME : 2 HOURS
Instructions:
Answer question one (compulsory) and any other two.
Question One
Give a definition of multimedia and a multimedia system.
(2mks)
Distinguish between lossless and lossy compression and state two broad types of multimedia data that each is suited for.
(6mks)
State four basic characteristics of a multimedia system.
(4mks)
What is the difference between intraframe sampling and interframe sampling?
(4mks)
What features of MIDI make it suitable for controlling software or hardware devices?
(6mks)
What is the difference between reverberation and echo?
(4mks)
Highlight two ways of creating digital images.
(2mks)
Question Two
What are critical bands in relation to the human ear’s perception of sound?
(3mks)
Why is data compression necessary for multimedia activities? (2mks)
How does MPEG audio compression achieve critical band approximation?
(3mks)
List three different perceptual characteristic of the human ear when hearing sound. Briefly explain how these arise in the human ear and how these methods are implemented in MPEG audio compression.
(12mks)
Question Three
In a digital signal processing system. What are meant by block and sample processing? Give an example of an application of each type. (4mks)
A piece of music that lasts three minutes is to be transmitted over a network. The piece of music has a four constituent instruments: drums, bass, piano and trumpet. The music has been recorded on a CD quality (44.1khz, 16 bit, stereo) and also as midi information, where an average the drams play 180 notes per minutes, the bass 140 notes per minute, the piano 600 notes per minute and the trumpet 80 notes per minute.
Estimate the number of bites, required for the storage of a full performance of CD quality audio and the number of bytes for the MIDI performance. You should assume that the general MIDI SEC of instruments is available for any performance of the recorded MIDI data.
(6mks)
Estimate the time IE would take to transmit each performance over a network with 64 KBPS.
(4mks)
C) Define the terms frequency masking and temporal masking of two or more audio signals and briefly mention the cause of each of this masking. (6mks)
Question Four
Show how you would encode the following token stream using zero length suppression and van length encoding ABCOOOAABOOOOOOOODEFABOOOOO.
(5mks)
State Nyquist’s sampling theorem.
(1mk)
What are the implications of Nyquist’s sampling theorem for multimedia data?
(4mks)
For each of the following media types, graphics, images audio and video, briefly discuss how Nyquist’s sampling affects the quality of the data and the form in which sampling effects manifest themselves in the actual data.
(7mks)
What is the key difference between I-frames, P-frames and B-frames? (3mks)
Categories: MULTIMEDIA SYSTEMS AND APPLICATIONS | (CISY 426) | 2ND TRIMESTER 2012
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