AMIETE – CS/IT (OLD SCHEME)

Code: AC21 / AT12                                                              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 the best alternative in the following:                                  (210)

             a.  The frequency range of the ultra sound is typically

(A) 0 to 20 Hz.                                    (B) 20 Hz to 20 KHz.

(C) 20 KHz to 1 GHz.                         (D) 1 GHz to 10 GHz.

             b.  The storage requirements of an image using super VGA (SVGA) resolution is of the order of

(A) 2.3 Mbytes.                                   (B) 786 Kbytes.

(C) 16 Kbytes.                                     (D) 307 Kbytes.

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

(A) Video                                            (B) Animation

(C) Audio                                            (D) Images

d. MPEG is used to compress the data of

(A) Still images.                                    (B) Audio data.

(C) Motion pictures.                             (D) Music data.

e. The requirement of network bandwidth for CD quality audio is

(A) 16 Kbps.                                       (B) 128-192 Kbps.

(C) 1.2 to 1.5 Mbps.                            (D) >20 Mbps.

             f.   Entropy encoding is used to compress data and its characteristics are

(A) It is a lossy process when used for images.

(B) It is a lossless process when used only for images.

(C) Entropy encoding is used regardless of the media specific characteristics.

(D) It is only used for audio signals.

             g.  Runlength encoding is an example of

(A) Entropy encoding.                          (B) Source encoding.

(C) Hybrid encoding.                            (D) None of the above.

             h.  The aspect ratio of HDTV images is

(A) 4: 3                                                (B) 1: 1

(C) 16: 9                                              (D) 9: 16

             i.   IEEE 802.3 standard speaks about

(A) Medium access control for Ethernet.                                                                           

(B) Token ring approach.

(C) Wireless LAN.                              

(D) Wireless personal area networks.

             j.   ATM supports various types of bit rates like (which of the following is wrong).

(A) Constant bit rate.                            (B) Variable bit rate.                                             

(C) Available bit rate.                           (D) None of the above.

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

  Q.2     a.   How do you classify media in multimedia? Briefly explain the five types of medium.                       (6)

                   b.                                                        Distinguish between synchronous, asynchronous and isochronous transmission    mode.                                                                                          (4)

c. Explain channel messages and system messages with reference to MIDI.             (6)

                                                                                                                                                                                 6 marks

Q.3     a.   Distinguish between captured image format and stored image format.                  (4)

             b.   Explain what you understand by streaming audio and streaming video.                 (6)

             c.   Real time transport protocol is used for the transport of audio and video streams.  Give the details of this protocol.                                                       (6)

  Q.4     a.   Explain the multiplexing techniques FDM, WDM and TDM as applied to multimedia networks.                            (8)

             b.   What are the characteristics of real time systems? In what way real time systems characteristics are related to multimedia applications.                                 (8)

Q.5           Draw the block diagram of JPEG encoder and explain the details of JPEG encoding.                              (16)

Q.6     a.   MPEG-2 defines five prediction modes.  List out these modes and explain each one in detail.                                (8)

                   b.                                                        Describe the six layers of the bit stream of an MPEG-1 video compression technique.                                                                                      (8)

Q.7     a.   What do you understand by a vocoder? Describe channel vocoder and formant vocoder.                         (8)

             b.   With the help of a block diagram, explain MPEG audio compression algorithm.                            (8)

Q.8     a.   Explain the centralized conference control and distributed conference control in detail.                               (8)

             b.   What are the various issues involved in session management in videoconferences?  Explain in detail.                      (8)

Q.9           Describe the characteristics of a multimedia database management system and its objects when handling multimedia data.                                           (16)