GTU Audio Video Systems - May 2016 Exam Question Paper

GTU Electronics and Communication Engineering (Semester 5)
Audio Video Systems
May 2016

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Describe the construction of a carbon microphone and explain its functioning. Why is a carbon microphone not suitable for PA amplifier systems?

7 M

1 (b) (i) Describe with the help of a neat diagram the working of variable density method of optical recording of sound on films

4 M

1 (b) (ii) Draw the cross section of cochlea and explain each part of it.

3 M

2 (a) Draw basic block diagram of an UP-LINK set-up and explain how the signals are compressed packetized and multiplexed before modulation and Transmission.

7 M

Solve any one question from Q2(b) & Q2(c)

2 (b) Show that a total channel bandwidth of 11.25 MHz would be necessary if both side bands of the modulated pictures are fully transmitted. Explain how the channel width is reduced to 7 MHz by allowing vestigial side band Transmission.

7 M

2 (c) Explain the meaning of brightness and contrast with respect to black and white pictures. What do you understand by gamma correction? What is the optimum distance for viewing television pictures?

7 M

3 (a) What is plasma? How its presence results in the flow of charge when a small voltage is applied across a plasma glass panel? How this results in the release of color photons?

7 M

Solve any two question from Q3(a), Q3(b) & Q3(c), Q3(d)

3 (b) (i) Give comparison of LED TV & Plasma TV.

3 M

3 (b) (ii) What do you mean by OLED? Give brief introduction of OLED in detail

4 M

3 (c) Enumerate Distinguishing features of LCD colour receives when compared with Plasma receives. What is 'Slow Response Time' and how its effect is minimized in LCD screens.

7 M

3 (d) (i) Describe the factors you will consider before deciding on whether to buy Plasma or LCD television.

4 M

3 (d) (ii) Give differences between LED backlit & LCD displays.

3 M

Solve any two question from Q4(a), Q4(b) & Q4(c), Q4(d)

4 (a) How is EDTV different from the conventional television system? Explain the MAC technique which enables separate transmission of luminance and chrominance signal to prevent mutual interference effects on the reproduced picture.

7 M

4 (b) (i) Write short note on following:
(a) Digitally controlled cameras
(b) Electronic Character generator

4 M

4 (b) (ii) Explain how you will locate the faults in a stereo amplifier.

3 M

4 (c) (i) Explain high definition television (HDTV).

4 M

4 (c) (ii) Distinguish between direct view receivers & rear projection systems & explain how each system function to display pictures.

3 M

4 (d) Draw and explain the block diagram of 3-D picture & stereo sound television receiver.

7 M

Solve any two question from Q5(a), Q5(b) & Q5(c), Q5(d)

5 (a) (i) Write Shorts note of following:
(a) Split half method
(b) Convergent Circuits

4 M

5 (a) (ii) What are the essential features of a sophisticated home theatre? Why is the location of speaker in the hall a very important feature?

3 M

5 (b) (i) Explain the need for compression and how compression works.

4 M

5 (b) (ii) Explain audio as data.

3 M

5 (c) (i) Explain the following terms:
(a) Brightness
(b) Contrast
(c) Viewing distance
(d) Luminance, Hue and Saturation.

4 M

5 (c) (ii) Explain time compression and expansion technique of digital audio.

3 M

5 (d) (i) Write short note on MPEG-x Format for video.

4 M

5 (d) (ii) Write short note on following:
(a) Vertical resolution
(b) Horizontal resolution

3 M

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