Birla Institute of Technology (BIT Mesra) 2006 MULTIMEDIA COMPUTING - Question Paper

Birla Institute of Technology & Science, Pilani

Distance Learning Programmes Division

Second Semester 2006-2007



Mid-Semester Test

(EC-1 Regular)



Course No. : EA ZC473

Course Title : MULTIMEDIA COMPUTING

Nature of examination : Closed Book

No. of Pages = 2

No. of ques. = five
Weightage : 40%

Duration : two Hours

Date of examination : 04/02/2007 (FN)

Note:

1. Please follow all the Instructions to Candidates provided on the cover page of the ans book.

2. All parts of a ques. should be answered consecutively. every ans should begin from a fresh page.

3. Mobile phones and computers of any type should not be brought inside the exam hall.

4. Use of any unfair means will outcome in severe disciplinary action.



Q.1. ans the subsequent precisely.



1.1. How presentation is various from representation medium?

1.2. How formatted text is various from hypertext in the terms of their intended purpose in multimedia systems?

1.3. List 4 important properties of multimedia system.

1.4. List and describe 3 kinds of transmission modes.

1.5. Specify range frequencies for Ultrasound and Hypersound? (1.5 x five = 7.5)



Q.2. Solve the subsequent. There will be no partial marking in any part of this ques..



2.1. provided the 2 acoustic waves 110cos(200*pi*t) and 110cos(202*pi*t). compute value of frequecy for the physical phenomenon that will take place due to these 2 waves.



2.2. A color video, with refresh rate of 30 Hz and with resolution 360 x 240, of 15 minutes duration is to be transmitted in five seconds. obtain the needed rate (in Mbits/sec) for the transmission.



2.3. Which 2 audio signals among 20cos(10000*pi*t), 20cos(10000*pi*t + pi/2), 30sin(pi/2 - 10000*pi*t), 100sin(30*pi*t), and 100cos(30*pi*t) can be distinguished by a human being when heard?



2.4. compute entropy of the data provided in the Table 1.



Table 1

Character
a
e
t
u

Frequency
400
100
200
300




2.5. An analog signal has a dynamic range of 81 dB. Determine minimum number of bits to be used to have quantization noise not more than 1.25% of the maximum amplitude. Also obtain minimum amplitude in terms of maximum amplitude. (2.5 x five = 12.5)



Q.3. provided the frequency table as in Table 1, decompress 0.125 using arithmetic decompression method. Perform only 1st 6 iterations. (6)



EA ZC473 (EC-1 REGULAR) 2nd SEMESTER2006-2007 PAGE 2







Q.4. Apply LZW and indicate the output and entries in the string table, to encode the subsequent string.



ababbaabbaaabb



presume the string table initially contains codes from 0 to 127, with the codes 91 and 92 allocated to characters a and b. Assuming that originally a character is stored in 7-bit, obtain compression ratio achieved by compressing the above string using LZW. [4 + three + one = 8]



Q.5. obtain Huffman code-words (optimised for minimum possible length) and the achieved compression ratio using Huffman coding, for the data provided in Table 2. presume originally a character is stored using 8-bit.



Table 2

Char
C
E
T
B
V
S
U
N
R

Freq
130
120
58
30
22
10
9
8
5


[4 + two = 6]



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Earning:   Approval pending.