Industrial Training presentation on

DOORDARSHAN(HDTV AND SDTV)

PRESENTED BY:

R ASHOK KUMARAVLEEN KAUR GREWAL

ARUN KUMARSANDEEP AGGARWALECE-2 7TH SEMESTER

GURU TEGH BAHADUR INSTITUE OF TECHNOLOGY

The head office is located at Doordarshan Kendra, Mandi house, New Delhi.

LARGEST BROADCASTING ORGANISATION

1st service started on 15th Sep,1959

Doordarshan = Distant + Show

Doordarshan is an Indian public service broadcaster.

INTRODUCTION

MAJOR UNITS

• Television studio• Production Control Unit (PCR)• Master Switching Room (MSR)• Earth Station• OB & DSNG VAN

TELEVISION STUDIO

• A television studio is an installation in which television or video productions take place.

• Doordarshan-Delhi has four studio halls: Studio Big (B) Studio Small (S) Studio Medium (M) Studio Large (L)

COMPONENTS OF TV STUDIO

• Camera• Lighting• Microphones• Vision mixer and

Audio consoles• MSR• VTR• Supporting services

like AC, UPS

• 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 various to

Earth station.• Signal can be Monitored at various stages.

• Router (64 X 64)• Audio/Video Switcher• OFC Rack• Frame Synchroniser• DVDs and AVDs• D/A and A/D converters• SPG• IRDs

Equipments Installed

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.

• PDA (Parabolic Dish Antenna)• FEED• Wave Guide / Low Loss Cable• HPA (TWTA, Klystrons)• Up converter• Modulator• Encoder• Multiplexer• IRD (Integrated Receiver Decoder)

Major Components of Digital Earth Station

WORKING OF EARTH STATION

OB VAN

• Outside broadcasting (OB) is the production of television or radio programmes from a mobile remote broadcast television studio.

• It is also known as mobile PCR.

• OB Van is equipped with: 8 numbers of Digital CCD cameras 16 input vision mixer and 16 audio mixer . One computerized MOVE CG for superimposing titles. Long haul microwave link is also available with OB.

DSNG VAN• It stands for Digital System

News Gathering and it operates along the OB van.

• It is also known as mobile Earth Station.

• The DSNG Van is equipped with:

Encoder Up converters / down

converters Baseband equipments

SDTV & HDTVPROJECT ALLOTTED

STANDARD DEFINITION TELEVISION (SDTV)

• SDTV in widescreen format provide Enhancements Multichanneling Eliminate errors found in analog

transmissions

• Aspect ratio- 4:3 or 16:9

• Little bit higher state of resolution than 'analog television system‘

• The two common SDTV signal types 576i 480i

CLARITY

• HDTV in widescreen format provide Closest to cinema quality Dolby surround sound

• Aspect ratio- 16:9

• Significant higher resolution than 'analog television system

• The three common SDTV signal types 720p 1080i 1080p

HIGH DEFINITION TELEVISION (HDTV)

RESOLUTION

SDTV VS HDTV

SDTV HDTV HDTV HDTV

WIDTH/SCAN 480i 720p 1080i 1080p

RESOLUTION 640x480 1280x720 1920x1080 1920x1080

RATIO 4:3 16:9 16:9 16:9

COLORS Limited Wide range Wide range Wide range

AUDIO Standard Dolby surround

Dolby surround

Dolby Surround

SDTVMerits:• More vivid than analog

TV • It has better sound.• Many accompanying

functions like multitasking, electronic program guide etc

Demerits:• Lower resolution than

HDTV

MERITS AND DEMERITSHDTVMerits:• Twice the linear resolution

of SDTV• Increases effective image

resolution

Demerits:• Require more bandwidth• Distorted pictures due to

lossy compression

THANKYOU