Television Engineering - May 2015
Electronics & Telecomm. (Semester 6)
TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) An odd number of lines are chosen in television system for scanning Justify.(5 marks) 1 (b) What is compatibility in TV transmission? What are the requirements to be met to make the colour system fully compatible?(5 marks) 1 (c) Compare Plasma, LED and LCD displays.(5 marks) 1 (d) Explain in brief Direct-to-home TV (DTH).(5 marks) 2 (a) Explain with the help of suitable sketch, how is video signal developed in a Vidicon camera tube? How is different from other camera tubes and what are its special applications?(10 marks) 2 (b) Draw the block diagram of PAL TV receiver and explain the working and functions of each block.(10 marks) 3 (a) What is the difference between component video and composite video? Give the main features by CCIR Rec. 601 for digital video standards.(10 marks) 3 (b) Describe new TV standards and compatibility adopted for HDTV. Explain MUSE system and its advantages.(10 marks) 4 (a) Sketch composite video signal waveform for at least three successive line and indicate:
i) Extreme white level
ii) Blanking level
iii) Pedestal height
iv) Sync. Pulse level(5 marks) 4 (b) Only (R-Y) and (B-Y) colour difference signals along with luminance signal is chosen for transmission. Justify the statement. Also explain why it is necessary to weight down the chrominance signal.(10 marks) 4 (c) What are the technical advantages of usig digital technology in television systems?(5 marks) 5 (a) What is the need of MAC encoding? Explain the general format of MAC signals for transmitting colour TV signals.(10 marks) 5 (b) Explain the following terms of Digital video.
ii) Viewing distance and angle
iii) Aspect ratio.(10 marks) 6 (a) Explain Interlace Scanning? Calculate the percentage of interlace error when the second field is delayed by 16 microseconds. Retrace time may be assumed to be negligible.(10 marks) 6 (b) Write a note on Wide Dimension High Definition Television and its standards.(10 marks)