Television Engineering - May 18

Electronics And Telecomm (Semester 6)

Total marks: 80
Total time: 3 Hours INSTRUCTIONS
(1) Question No. 1 is compulsory
(2) Attempt any three out of remaining five questions
(3) Draw neat diagrams wherever necessary

Q1) Answer any four from the following:

1(a) Why (G-Y) is not transmitted in color television system? (5 marks)

1(b) List electrical characteristics of NTSC system (5 marks)

1(c) Channel bandwidth in PAL system is 7 MHz. Draw and explain. (5 marks)

1(d) Give reason - Cross color and cross luminance interference is eliminated in MAC signal transmissions. (5 marks)

1(e) Draw tuner block diagram in television receiver and explain the function. (5 marks)

1(f) State the following:
i) Horizontal scanning frequency in PAL system
ii) Vertical scanning frequency in PAL system
iii) Picture IF
iv) Sound IF (5 marks)

Q2) Draw PAL encoder block diagram and explain in detail. Also explain bow phase errors get cancelled in PAL system. (20 marks)

3(a) Explain interlaced scanning in TV system in detail with appropriate diagrams and waveforms (10 marks)

3(b) Draw composite video signal and label all parts. Explain why sync pulses are above black level. (10 marks)

4(a) Explain MAC encoding in digital TV system. Draw D2 MAC signal. (10 marks)

4(b) Explain DTH system (10 marks)

5(a) Explain the working of LCD display. (10 marks)

5(b) Explain why Chroma is subsampled in digital video formats. Give details of Rec 601 (4:2:2) (10 marks)

Q6) Write short notes (any two):
i) HDTV
ii) MUSE system
iii) Camera tubes (any one)
iv) Compatibility considerations in monochrome and color TV (20 marks)