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. A data stream is called strongly regular when

(A)  All packets are of constant data size                                                                         

                   (B)  Data size of packets changes periodically

(C)   Data size of packets is neither constant not changing periodically                               

(D)  Data size of packets increase and then decreases

b. A still image is coded using the following code

(A) ASCII code                                 (B)  JPEG format

(C) MPEG-4 format                            (D)  None of these

c. An audio signal is sampled at the rate of 44,000 samples per second with eight bit quantization. The data generated per second is

(A) 352 Kbytes                                  (B)  44 Kbytes

(C)  88 Kbytes                                    (D)  704 Kbytes

             d.   Huffman coding is used to

(A)  Expand the text size                      (B)  To compress the text size

(C)  To compress video data               (D)  To expand video data

             e.   Vocoders are used for

(A) Image coding                               (B) Text coding

(C)  Voice coding                                (D) All of the above

             f.    The bandwidth of a CD quality sound in MP3 compression technique is typically

(A) 20 KHz                                         (B)  10 KHz

(C) 5 KHz (D)  3.5 KHz

             g.   The bandwidth requirement for video conferencing is of the order of

(A) 20 kbps                                       (B)  100 mbps

(C)  1 mbps                                         (D)  10 mbps

h.   Which of the following is false for MIDI?

(A) It is a digital interface.

(B) It enables computer to communicate with musical devices.

(C) The MIDI devices interact through messages.

(D) The MIDI keyboard is used to produce sound.

             i.    Which of the following is an audio compression algorithm?

(A)  JPEG                                           (B)  MPEG-1

(C)  MPEG-2                                      (D)  MP3

             j.    The GIF (Graphics Interchange Format) is limited to ______________.

(A)  8-bit color images                         (B)  16-bit color images

(C)  8-bit black and white images         (D)  16-bit black and white images

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

Q.2     a.   What are the differences between temporal media non-temporal media? List out three examples in each case.                                                                                                                 (4)

             b.   Describe the data stream characteristics of continuous data like audio and video data streams with examples.                                                                                                                         (8)

c.   Compare motion dynamics and update dynamics as applied to interactive graphics.             (4)

Q.3     a.   Write brief notes on hypertext transfer protocol (HTTP).                                    (6)

             b.   Explain Huffman coding, with a suitable example for compressing data.               (6)

c.   Distinguish between presentation level video and real time video.                         (4)

Q.4     a.   Explain at least four of the modes used for JPEG compression techniques used for compressing video data.                                                                                                                         (6)

b.   What are the problems addressed by JPEG2000 standard? Briefly explain them.                (6)

c.   Compare the performance of JPEG and JPEG2000 standards used for compressing video data.                                                                (4)

Q.5           Write Brief notes on the following topics:

      (i) Texture coding  

                   (ii) Shape coding 

                   (iii) 2D mesh object coding (16)

Q.6     a. Explain BIFS binary format for scene.  (4)

             b.   Write down and explain the five levels used in handling bit stream in MPEG-4 standard.                  (6)

             c.   Describe the operation of channel vocoder in detail, with the help of a block diagram.                     (6)

Q.7     a.   What do you understand by video on demand?                                                   (4)

b.   What are the characteristics of a real time system? Explain each one briefly.                        (6)

c.   Compare and contrast the features of frequency division multiplexing and time division multiplexing.                                                            (6)

Q.8     a.   Describe FCFS disk scheduling algorithm with an example.                                 (8)

b.   Distinguish between asynchronous and synchronous traffic. Explain the meaning of the network parameters: synchronous bandwidth, TTRT and buffer size.                                                                  (8)

Q.9     a.   Describe the four different types of bit rates supported for multimedia data transmission over ATM networks.                                                                                                          (4)

b.   MDBMS can be characterized by its objectives when handling multimedia data. What are these objectives? Explain each one briefly.                      (12)