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 best alternative in the following:                                         (2x10)

             a.  The data rate of a telephone quality signal is

(A) 64 Kbytes/sec.                               (B) 64 Kbits/sec.

(C) 88 Kbytes/sec.                               (D) 176.4 Kbits/sec.

             b.  Hyper text transfer protocol (HTTP) is designed for

(A) Transmitting hypermedia.                (B) Transmitting telephone signals.

(C) Transmitting MPEG images.           (D) Used to transmit only still images.

c. The typical compression performance of MPEG-1 frames for I type and type B frames respectively are

(A) 70: 1 and 50: 1                               (B) 7: 1 and 500: 1

(C) 7: 1 and 50: 1                                 (D) 27: 1 and 27: 1

             d.  An MPEG audio compression algorithm divides the input into

(A) 64 frequency sub bands.                         

(B) 32 frequency sub bands.

(C) Does not divide the input into sub bands.  

                  (D) 128 frequency sub bands.

             e.  The requirement of network bandwidth for compressed HDTV images is

(A) 1.5 Mbps.                                      (B) 64 – 640 Kbps.

(C) >20 Mbps.                                    (D) 64 Kbps – 2 Mbps.

             f.   Hierarchical mode of data compression uses                                                                        

(A) Encoding of images at different resolution.

(B) Encoding of image at 1024 X 1024 resolution.

(C) Encoding pixel groups 16 X 16.

(D) Encoding using runlength code.

             g.  One of the following modes is supported by JPEG standard.

(A) Sequential mode.                            (B) Progressive mode.

(C) Hierarchical mode.                         (D) All the three modes.

h.  IEEE 802.5 standard is used to specify

(A) Medium access control and physical layer specification for token ring.

(B)  Medium access control and physical layer specification for wireless LAN.

(C) Standard for Logical Link Control (LLC).

(D) Access method and physical layer specification for broadband wireless networks.

             i.   RSVP is developed to (specify which of the following is not true).

(A) For Internet resource reservation.  

(B) Generate desirable quality of service.

(C) Take care of many senders and receivers competing for limited network

                         bandwidth.

(D) Perform the operating system protocols.

             j.   A normalized histogram (which of the following is incorrect)

(A) Effectively removes size of the image.

(B) It may be called probability density function.

(C) Effectively removes the color content of the picture.

(D) Divides the histogram values by total pixel count.

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

  Q.2     a.   List out the steps required in image recognition.  Briefly explain each step in detail.                      (10)

             b.   Explain three different approaches of color encoding of an image.                        (6)

Q.3     a.   Briefly explain what do you understand by extensible markup language (XML).                  (6)

             b.   Distinguish between intra and interobject synchronization.                                    (4)

             c.   Write brief notes on TCP, UDP and IP as used in multimedia networks.              (6)

Q.4     a.   Distinguish between circuit switching and packet switching.                                 (4)

             b.   Give the details of ATM cell structure and explain the details.                              (8)

             c.   Distinguish between inter frame coding and intra frame coding.                            (4)

Q.5     a.   Briefly explain various QoS issues.                                                                     (6)

             b.   What are the steps involved in image preparation used in JPEG image compression.  Explain them with the help of a diagram.                                (10)

Q.6     a.   MPEG distinguishes four types of image coding for processing.  List out these four types and explain how images are coded using these four types.  

                                                                                                                                           (10)

             b.   Explain MP3 compression.                                                                               (6)

  Q.7     a.   What are the video bit rates supported by ATM networks.  Explain briefly.         (8)

             b.   Explain run length coding on ac coefficients and differential pulse code modulation (DPCM) on dc coefficients.                                         (8)

  Q.8     a.   Explain the different layers of OSI reference model in detail.                              (10)

             b.   Distinguish between cell relay and frame relay with examples.                              (6)

  Q.9     a.   What do you understand by voice over IP?  Explain one mechanism in detail.                               (8)

             b.   Write a brief notes on image searching techniques.                                              (8)