# Engineering

B.E. (Electronics) AUDIO AND VIDEO ENGINEERING (2008 Pattern) (Sem. – II) (Elective – III)

Time :3 Hours]                                                                           [Max. Marks :100

Instructions to the candidates:-

1)            Answer any three questions from each section.

2)            Answers to the two sections should be written in separate books.

3)             Neat diagrams must be drawn wherever necessary.

4)             Use of electronic pocket calculator is allowed.

5)            Assume suitable data, if necessary.

SECTION – I

QI) a) Justify the choice of 625 lines for TV transmission. Why is the total number of lines kept odd in all television systems? What is the significance of choosing the number of lines as 625 and not 623 or 627?                                                                                            [6]

b)            Describe basic principle of a colour camera with the help of suitable diagram. Explain why dichroic mirrors are used in camera optics? [6]

c)             What do you understand by interlaced scanning? How interlace scanning reduces flicker and conserves bandwidth?                                                                      [6]

OR

Q2) a) Give construction and operation of LCD TV screen and TFT displays used for TV?                                                                                                                       [6]

b)            Define Luminance, saturation and Hue?                                              [6]

c)             What do you understand by resolution or Kell-factor? How does it affect the vertical resolution of a television picture? Show that the vertical resolution increases with increase in number of scanning lines? [6]

Q3) a) Draw block diagram of an NTSC colour TV receiver and describe how does it produce R, G and B signals?                                                                            [8]

b)            Explain with block diagram IF modulated TV Transmitter?                     [8]

Q4) a) A 300 line TV system has following specifications.                                          [8]

Vertical scanning frequency = 25 hz

Blanking duration (horizontal and vertical) = 15% of active duration Aspect ratio = 4/3 Interlace ratio = 1:1 Kell factor = 0.69

Calculate maximum BW required for transmission? b) Explain working of PAL Encoder with suitable block diagram? Explain How colour signals are modulated with suitable diagrams?                                                                                                       [8]

Q5) a) With timing diagram explain MAC technology in detail. State advantages of MAC signal? Explain the time compression used in MAC technology?

b) Explain DCT base image encoding 8 decoding for JPEG?                             [8]

OR

Q6) Write short note on any four                                               [16]

a)            MPEG – 2.

b)            Wobbuloscope Applications.

d)            Composite encoded DTV transmitter.

e)            Pattern Generator 8 applications.

SECTION – II

Q7) a) Explain block diagram of set Top Box in context to direct to home service. State names of Direct to home service providers in India? What is CAS facility?    [8]

b)            Describe with the help of block diagram the working of Component Encoded High definition TV Transmitter?                                                                    [6]

c)            Explain 3D stereoscopic technique? What are different glasses used? [4]

OR

Q8) a) With suitable block diagram explain advantages and applications of CCTV? [4]

b)            Explain the concept of video on demand in satellite television? [4]

c)             State different standards used for HDTV broadcast?                                  [4]

d)            Digital broadcasting case study on Cricket match?                                     [6]

 Q9) a) Draw and explain the block diagram of a CD player. Write important specifications of CD? [8] b) Explain MP3 Audio compression format? [4] c) Define following terms to P.A. system? [4] i) Phase delay. ii) Acoustic feedback.

OR

QIO)a) Explain in detail Dolby sound system and also state its advantages? [4]

b)           Compare the performance of magnetic tape recording with optical recording?           [8]

c)            Compare Audio CD versus DVD?                                                                 [4]

QII) a) Explain concept of Reverberation and echo. Mention typical reverberation periods?                                                                                                                [6]

b)            Explain different Acoustical design aspects of an Auditorium? [4]

c)            Draw 8 explain the block diagram of Satellite Radio receiver? [6]

OR

Q12)Write short note on any Four                                             [16]

a)            Cordless microphone System.

b)           Blue – ray disk DVD System.

c)            Audio tape versus video tape.

d)           VHS video formats.

e)            Graphic Equalizer.