Code: AC-21 / AT-12                                                           Subject: MULTIMEDIA SYSTEMS

Time: 3 Hours                                                                                                     Max. Marks: 100

NOTE: There are 9 Questions in all.

· Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.

· Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks.

· Any required data not explicitly given, may be suitably assumed and stated.

Q.1       Choose the correct or best alternative in the following:                                         (2x10)

a. A moving image is coded using the following code:

(A)  EBCDIC Code                            (B)  ASCI Code

(C)   MPEG                                        (D)  JPEG

b. The frequency range of ultra sound is:

(A) 20 HZ to KHZ                             (B)  0 to 20 HZ

(C) 1 GHZ to 10 GHZ                        (D)  20 KHZ to 1 GHZ

             c.   The basic video bandwidth required to transmit luminance signal for NTSC standard is:

(A) 6 MHZ                                        (B)  4.2 MHZ

(C)  20 KHZ                                       (D)  20 MHZ

             d.   A data stream is said to be irregular when

(A)  All packets are of constant data size. 

(B)  Data size of packets changes periodically.

(C)  Data size of packets is neither constant nor changing periodically.

(D)  Data size of packets first increases and then decreases.

             e.   MPEG1 standard specify typically a picture size of (vertical  horizontal) pixels:

(A) 800  1200                                 (B) 1200  800

(C) 540  720                                    (D) 720  540

             f.    The bandwidth of a telephone quality sound using MP3 compression technique is:

(A) 15 KHZ                                        (B)  11 KHZ

(C) 4.5 KHZ                                       (D)  3.5 KHZ

             g.   Medium access method and physical layer specification for wireless LAN are specified by the IEEE standard:

(A) 802.2                                           (B)  802.3

(C)  802.5                                           (D)  802.11

             h.   XML stands for

(A) Extensible Markup Language.

(B) Extended Markup Language.

(C) Extensible Marked Language.

(D) Extensively Marked Language.

             i.    The picture size of CIF format is

(A)  720  480.                                  (B)  720  576.

(C)  352  288.                                  (D)  800  1200.

             j.    Which of the following is not a temporal media?

(A)  Video                                           (B)  Animation

                   (C)  Audio                                           (D)  Images

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

Q.2     a.   Distinguish the three different transmission modes of multimedia data.                  (4)

             b.   Identify the steps involved in image recognition.  Explain all the steps briefly.                       (8)

c.   Distinguish between captured image format and stored image format.                  (4)

Q.3     a.   The enhanced graphics adapter (EGA) supports a resolution of 640  350 pixels with each pixel representing 16 different colors.  Calculate the storage capacity required to store 50 images.           (5)

             b.   Explain major features of JPEG2000.   (5)

c.   What are the different prediction modes used in MPEG2 video compression?  Explain briefly.                                                                    (6)

Q.4     a.   Draw the block diagram of MPEG audio encoder and decoder and explain its details.                    (10)

b.   Write brief notes on BIFS.                                                                                 (6)

Q.5     a.   Describe the six hierarchical layers used for the bit stream of MPEG1 data compression.                (6)

     b.   Write brief notes on MIDI.                                                                                 (4)

             c.   Explain object based visual coding – static texture coding-used in MPEG4.         (6)

  Q.6     a. Distinguish between packet switching and circuit switching as the terms are used in multimedia networks.                                                                (6)

             b.   Explain the details of Real Time transfer Protocol (RTP).                                    (6)

             c.   Distinguish between frame relay and cell relay.                                                    (4)

Q.7     a.   What are the differences between continuous media data and discrete data?  Explain.                     (6)

b.   Draw the block diagram of group communication protocol and explain in detail.                  (10)

Q.8     a.   Explain a mechanism of retrieving images.                                                           (8)

b.   What are the different control mechanisms used in session management?  Explain each one in detail.                                                                       (8)

Q.9     a.   Describe the differences between multicast, broadcast and unicast messages.                      (4)

b.   What are the important parameters of QoS for multimedia data transmission?  Explain briefly.                                                                    (8)

c.   Give typical values of uncompressed data rate and the range of frequencies used for telephone, FM radio, CD and DVD audio applications.         (4)