doordarshan
TRANSCRIPT
VOCATIONAL TRAINING ON
DOORDARSHAN
PRESENTED BY:PRASENJIT SARKAR
DEPT-ECE WBUT Roll NO-14800311049FUTURE INSTITUE OF ENGINEERING AND
MANAGEMENT, KOLKATA
CONTENTS
Introduction
Objective
Modulation Technique
CCVS
Major units
Television Studio and its Components
Production Control Room
Master Switching Room
Earth Station
OB Van
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.
INTRODUCTION
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
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
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
MAJOR UNITS
• Television studio
• Production Control Unit (PCR)
• Master Switching Room (MSR)
• Earth Station
• OB VAN
TV STUDIO AND ITS COMPONENTS
• Camera• Lighting• Microphones• Vision mixer and Audio
consoles
Components-
• A television studio is an installation in which television or video productions take place.
Activities in this area are:-
Direction to the production crew by the producer
Timing a production/telecast
Editing
Monitoring of output/off air signal
Production Control Room
• Monitor Program And
Graphics
• Vision Mixer
(to select video sources)
• Audio Mixer
• Linear and Non-Linear editing
Vision Mixer
• Audio Mixer
Components of PCR
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.
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.
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