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.

WORKING OF EARTH STATION

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

THANKYOU