Subject Code: 161002
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI(OLD) - EXAMINATION - SUMMER 2019
Subject Name: Audio - Video Systems
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Draw the circuit diagram of the class B push pull amplifier and explain it. Derive the equation of efficiency for it. Also explain all distortion regarding class B push pull amplifier. [07]
(b) What do you mean by Resolution? Explain Horizontal & Vertical resolution. Prove that maximum Video frequency that need to be handled in 625 line TV system is 5 MHz. [07]
Q.2 (a) Draw the cross section of cochlea and explain each parts of it. Also explain mental process. [07]
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(b) Enlist the characteristics of Digital Audio Broadcasting. Also write its advantages and disadvantages. [07]
OR
(b) What is sampling? How quantizing is useful? Also draw and explain PCM system in detail. [07]
Q.3 (a) Explain Crossover Networks in detail. [07]
(b) Explain preamplifier and its requirement. [07]
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OR
Q.3 (a) Draw the Composite Video signal for at least three Horizontal lines and explain it in detail. [07]
(b) Explain Interlaced scanning in detail with-scanning sequence diagram. [07]
Q.4 (a) Draw block diagram for separation of U and V colour phasor signals and explain it. [07]
(b) Sketch the details of horizontal blanking and sync. pulses. Label on it :
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1. Front porch ii. Horizontal sync pulse iii. Back porchExplain significance of each portion. [07]
OR
Q.4 (a) Why vestigial sideband transmission is used in TV? Explain Vestigial sideband transmission in detail. What are the merits & demerits of VSB transmission? [07]
(b) Which modulation system is used for Picture and Sound in TV? Why? Also explain Positive and Negative modulation. Enlist the advantages of Negative modulation. [07]
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Q.5 (a) Explain Interference suffered by TV signal in detail. [07]
(b) List the types of Television systems and standard used worldwide and explain it in detail. [07]
OR
Q.5 (a) Draw the block diagram of VHF Tuner and explain it in detail. [07]
(b) Explain HDTV in detail. [07]
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Date: 21/05/2019
Total Marks: 70
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