This document provides an overview of vocational training on Doordarshan, India's public service broadcaster. It introduces Doordarshan as the largest broadcasting organization in India, with its headquarters in New Delhi. The objectives of Doordarshan are to promote national integration and unity through a mix of entertainment, information, and education programs available free of cost. The document then describes the modulation techniques, color composite video signal, major units like television studios, production control rooms, master switching rooms, earth stations, and OB vans. It provides details on the components and functioning of these units.

1. VOCATIONAL TRAINING
ON
DOORDARSHAN
PRESENTED BY:
PRASENJIT SARKAR
DEPT-ECE WBUT Roll NO-14800311049
FUTURE INSTITUE OF ENGINEERING AND
MANAGEMENT, KOLKATA

2. CONTENTS
 Introduction
 Objective
 Modulation Technique
 CCVS
 Major units
 Television Studio and its Components
 Production Control Room
 Master Switching Room
 Earth Station
 OB Van

3. INTRODUCTION
 LARGEST BROADCASTING
ORGANISATION
 The head office is located at
Doordarshan Kendra, Mandi
house, New Delhi.
 1st service started on 15th
Sep,1959
 Doordarshan = Distant + Show
 Doordarshan is an Indian
public service broadcaster.

4. OBJECTIVE
 Programmes promotes national intregation and unity
 Mix of entertainment , information and education
 To provide TV facility to all section of people at free of cost

5. MODULATION TECHNIQUE
 Video signal amplitude modulated and sound signal is
frequency modulated.
 VIDEO TRANSMISSION-Normal
AM technique required a BW around 11 MHz
Large BW limit the no of channel in allotted spectrum
VSB AM technique reduces the BW to 5.75 MHz
 SOUND TRANSMISSION-Sound
carrier is 5.5 MHz above the vision carrier
Sound is frequency modulated
Maximum frequency deviation is 50 KHz

6. COLOUR COMPOSITE VIDEO SIGNAL
 Video is nothing but sequence of picture
 If we see more than16 picture per second then we see the continuous
motion
Fig-Colour composite video signal

7. MAJOR UNITS
• Television studio
• Production Control Unit (PCR)
• Master Switching Room (MSR)
• Earth Station
• OB VAN

8. TV STUDIO AND ITS COMPONENTS
• A television studio is an
installation in which
television or video produc
tions take place.
Components-
• Camera
• Lighting
• Microphones
• Vision mixer and Audio
consoles

9. Production Control Room
 Activities in this area are:-
 Direction to the production crew by the producer
 Timing a production/telecast
 Editing
 Monitoring of output/off air signal

10. Components of PCR
• Monitor Program And
Graphics
• Vision Mixer
(to select video sources)
• Audio Mixer
• Linear and Non-Linear editing
Vision Mixer
• Audio Mixer

11. Master Switching Room
• It is the heart of the studio.
• Signal is routed through MSR from various to Earth
station.
• Signal can be Monitored at various stages.

12. EARTH STATION
• An earth station is
a terrestrial terminal station.
• Designed for transmission
and reception of radio
waves from an astronomical
radio source.
• The signal is up-linked from
the Earth Station and
received by many down link
centers in TV broad casting
via satellites.

13. WORKING OF EARTH STATION

14. OB VAN
 OB van is used for live broadcasting like any match or any
event. It consist all the equipments that is present in the
studio for telecasting. It also referring as mini studio . It has
mainly 3 parts :
1)Power supply unit
2)Production control unit
3)Audio console and VTR

15. THANK
YOU