Audio - Video Systems — Winter 2021

Briefly explain following terms related to Audio Video Systems:

Aspect Ratio (ii) Brightness (iii) Saturation (iv) Luminance

Line out (vi) Aux. in (vii) Phon

Sketch composite video signal waveform for at least three successive lines and indicate extreme white level, blanking level, pedestal height and sync pulse level on it with brief explanation.

Write short note on: Cable Television Network.

What is meant by degaussing and why is it needed? Draw and explain automatic degaussing circuit for TV receiver.

Classify Power Amplifiers and explain Class-B Push-Pull Amplifier.

Draw block diagram of PA system and explain working of mixer circuit for PA system.

Write functions of video IF amplifier and draw overall IF response curve of a TV receiver tuned to channel-3 (band-I). Show all frequencies on the curve.

Explain working principle of loud speaker with necessary diagram. Discuss about different types of headphone.

Draw the block diagram of PAL-Dcolour receiver.

What are the functions of a typical TV tuner? Draw and explain block diagram of VHF tuner.1

What is the working principle of microphone? List different types of microphones and write applications of each.

(i) Explain the basics of magnetic recording with necessary diagram. (ii) Write short note on: stereophony and multichannel sound

What is interlaced scanning? How it is done? What are its merits over? simple (progressive) scanning?

Explain how the luminance and color difference signals are developed from Camera outputs. Why is it necessary to set Y = 0.3R + 0.59G + 0.11B?

Discuss (i) Cross Over network (ii) Audio terminations

Compare LED TV, LCD TV & Plasma TV.

List the types of Television systems and standard used worldwide and Explain it.