doordarshan report
TRANSCRIPT
ASeminar
On “DOORDARSHAN”
Taken At DOORDARSHAN KENDRA , JAIPUR
SUBMITTED ByRAKESH KUMARIV Yr. ECE
http://powerpointpresentationon.blogspot.com1
COMPANY PROFILE
• DOORDARSHAN- Broadcasting Corporation of india.
• Head Office : Copernicus Marg, New Delhi.• Dir. General : Ms. Aruna Sharma• Engineer -in- Chief : Mr. R.R. Prasad• Chief Executive Officer: Mr. B.S Lalli• Jaipur Station Engineer : Mr. R.S. Tyagi• Website: www.ddindia.com
2
AIM / SERVICES
• Awareness by means of – krishi darshan, Kalyani, Paramarsh, etc.
• Knowledge by means of – Prashnotri, Khuli Charcha, etc.
• Entertainment by means of – Chitrahaar, Sanskriti Darpan & live Coverages of other activities, etc.
3
CONTENTS• Introduction• TV STUDIO• VISION MIXER• AUDIO/ VIDEO CHAINS• MSR • EARTHSTATION• TV Tx• ANTENNAS & SATELLITES• OB VAN & DSNG• SETUP IN RAJASTHAN
4
INTRODUCTION
To Broadcasting• A process of sending information to a distant
place is called Broadcasting.• Need ?• Means of Broadcasting in India:
1. Terrestrial 2. Satellite3. Internet• Both AIR & DD make use of both Terrestrial &
satellite.
5
• Intro cont...• Broadcasting started in India in the year
1923.• AIR was formed in the year 1936.• In 1947, AIR was covering 2.5% & about
11% of land & population respectively.• 1st T.V Station was established in Delhi in
1959• T.V was separated from AIR in 1976
6
• Intro cont...• DD has 1500 Transmitters and 70
Production centers across the Country.• These centers are divided in 3 levels-National centers-Regional centers-Local centers • On 1st June 1987, Jaipur Doordarshan
Kendra was set up at Jhalana Doongri and transmission started on 6th July 1987.
7
TV STUDIO
• A television studio is an installation in which television or video productions take place .
8
COMPONENTS OF TV STUDIO
• Camera• Lighting• Microphones• Vision mixer and Audio consoles• MSR• VTR• Acoustics• Post production and video effects• Supporting services like AC, UPS
9
VISION MIXER• A vision mixer (also called video
switcher, video mixer or production switcher) is a device used to select between several different video sources and in some cases mix video sources together and add special effects.
• It has many input sources such as cameras, VCR/ server, Graphics/Character Generators,etc.
• Out of these i/p, any source can be taken as o/p.
• Sources can be changed as cut to cut, dissolve, wipe and other special effects.
10
TYPICAL VIDEO CHAIN
TYPICAL AUDIO CHAIN
DistributorVision Mixer LOGOGenerator
Earth station through
Optical Fiber
STLLink
Sources
DistributorAudio Console
Analog to AES
Converter
Earth station through
Optical Fiber
Sources
STL Link
11
MSR
• It is the heart of the studio.• Most of the switching
electronics is kept e.g. camera base stations, switcher main frame, Satellite receivers, MW link, & most of the patch panels.
• Signal is routed through MSR.• Signal can be Monitored at
various stages12
EARTH STATION• Earth Station is a very important part of satellite
communication system for broadcasting of signals.
• It is an uplink center from which the signals are fed to Satellite for distribution in a specified area covered by the Satellite.
• The signal is up-linked from the Earth Station and received by many down link centers in TV broad casting via PDA.
• Two Types: 1) Analog2) Digital• Digital Earth Stations are widely used because of
various advantages over analog. 13
Major Components of Digital Earth Station
• PDA (Parabolic Dish Antenna)• FEED• Wave Guide / Low Loss Cable• HPA (TWTA, Klystrons)• Up converter• Modulator• Encoder• Multiplexer• IRD (Integrated Receiver Decoder)
14
15
Types of TV Transmitters • VLPT’s, LPT’s & HPT’s• A 10 KW HPT of Jaipur zone is
situated at the highest mountain peak i.e Nahargarh.
• It is only 10-20% efficient.• It has beamwidth of 360 deg,
hence can cover upto 65 kms of area around it.
• It has various other supporting units with it to maintain the quality of s/g to be Txd. Like- Monitoring section, blower section, amplification section
16
Antennas & Satellites• An antenna (or aerial) is a transducer
designed to transmit or receive electromagnetic waves. In other words, antennas convert electromagnetic waves into electrical currents and vice versa.
Electromagnetic waveElectrical signal
Transmitting Antenna
Receiving Antenna17
TYPES
• Isotropic antenna (idealized)o Radiates power equally in all
directions• Dipole antennas
o Half-wave dipole antenna (or Hertz antenna)
o Quarter-wave vertical antenna (or Marconi antenna)
• Parabolic Dish / Reflective Antenna
18
OB Van & DSNG
• A typical OB Van is usually divided into 4 parts.
• The first and largest part is the production area or sitting area for all directors & producers.
• The second part of a van is for the audio engineer.
• The 3rd part of the van is video tape
19
• The 4th part is transmission where the signal is monitored by and engineered for quality control purposes and is transmitted or sent to other trucks.
• DSNG is a portable uplinking centre.
20
DD Setup In Rajasthan• Modes-
-Terrestrial (Area coverage – 72%)-Satellite (Area coverage – 100%)• Transmitters - 90• Satellite – INSAT• Transponder used - C-6• Satellite Position - 93.5’ E• Uplinking frequency – 6165.5 MHz• Downlinking frequency – 3940.5 MHz• Modulation Scheme - QPSK
21
Thank You
Any Queries?
22