A SIMENAR PRESENTATION ON DD

1. PRESENTED BY :

2. Doordarshan = Distant + Show.
Doordarshan is an Indian public service broadcaster.
 One of the largest broadcasting organizations in
India in terms of the infrastructure of studios and
transmitters.
 According to Pioneer Investors, the Indian cable
industry is worth 270 billion and is the third largest in
the world after China and United States.

3. 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

4. •Broadcasting :
A process of sending information to a distant place is
called Broadcasting.
•Means of Broadcasting in India:
1. Terrestrial
2. Satellite
3. Internet
•Both AIR & DD make use of both Terrestrial & satellite.

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

6. •Camera
•Lighting
•Microphones
•Vision mixer and Audio consoles
•MSR
•VTR
•Acoustics
•Post production and video effects
•Supporting services like AC, UPS

7. •A vision mixer 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.

8. SOURCE
VISION
MIXTER
LOGO
GENER
ATER
EARTH
STATION
THROUGH
OPTICAL
FIBOR
DISTRIBUTER
STL
LINK
ANALOG
TO AES
CONVRTER
SOURCE
AUDIO
CONSOL
DISTRIBUTER
STL
LINK
EARTH
STATION
THROUGH
OPTICAL
FIBOR

9. •It is the heart of the studio.
•Most of the switching
electronics is kept e.g. camera
base stations, switcher main
frame, SPG, Satellite receivers,
MW link, DDA & most of the
patch panels.
•Signal is routed through MSR.
•Signal can be Monitored at
various stages

10. •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(Parabolic Dish Antenna).
•Two Types:
1) Analog
2)Digital
•Digital earth station are wildly used of various
advantage over analog.

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

12. VLPT : Very Low Power Transmitter
•10w-50w
•Used for small coverage areas.
LPT : Low Power Transmitter
•100w-500w
•Used for relatively large areas.
HPT : High Power Transmitter
•More than 1kw
•Used for larger areas.

13. •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.
Transmitting Antenna
Receiving Antenna

14. Isotropic antenna (idealized)
•Radiates power equally in all
directions.
Dipole antennas•Half-wave dipole antenna (or
Hertz antenna)
•Quarter-wave vertical antenna (or
Marconi antenna)
Parabolic Dish / Reflective
Antenna

15. A typical Outside Broadcasting 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
•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.

17. •This is known as direct satellite news
gathering.
•It works simultaneously with OB van.
•Its also called as mobile earth station.
•The dish can be aligned acc to the
requirement.
•Monitors are available in this van to check
the telecast.
•High power ups are also available in this
van.