Post on 08-Apr-2018
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SEMINAR-2011
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DTH stands for Direct-To-Home television.Defined as the reception of satellite programs witha personal dish in an individual home.
DTH symbols the Transmission of digital videochannel to home subscribers through small dishantennaDTH does away with the need for the local cableoperator and puts the broadcaster directly in touchwith consumer .
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DTH services were first proposed in INDIA in 1996. But
was not approved due to the concerns over national
security.
In 1997 Again Ban imposed Rupert Murdoch- ownedINDIAN SKY BRODCASTING(ISKYB). Finally, in 2000 DTH
was allowed and it was Doordarshan which make it
possible to provide its facilities to consumers from 1st
April 2000.
New policy requires all operators to set up in 12 months
for license. DTH licenses in India will cost $2.14 million
and will be valid for 10 years.
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DTH network consists of
Broadcasting center
Satellites Encoders
Multiplexers
Modulators
DTH receivers.
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A DTH service provider has to lease Ku-band
transponders from the satellite. The encoder converts
the audio, video and data signals into the digital format
and the multiplexer mixes these signals. At the user
end, there will be a small dish antenna and set-top
boxes to decode and view numerous channels. On the
user's end, receiving dishes can be as small as 45 cmin diametre.
DTH is an encrypted transmission that travels to
the consumer directly through a satellite. DTH
transmission is received directly by the consumer at
his end through the small dish antenna. A set top box,unlike the regular cable connection, decodes the
encrypted transmission.
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BROADCAST CENTERBROADCAST CENTER
The broadcast center converts all of this programming into a high-
quality, uncompressed digital stream.
At this point, the stream contains a vast quantity of data about 270
megabits per second (Mbps) for each channel.
For DTH system communication channels air and Band-Width is :
Ku Band Uplink : 13.75 to 14.5 GHz
Ku Band Down links : 10.95 to 11.2 GHz
: 11.45 to 11.70 GHz
: 12.50 to 12.75 GHz
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RECEIVINGTERMINALSRECEIVINGTERMINALS
The receive terminals are basically for the reception of the signals being
beamed from the transmission station. The terminal consists of the
following:
receive type solid offset antenna
LNB feed system
Interface cables &
Set top box
The terminal can be placed outside the window of a high rise building,
on the ground or a roof mount. The terminals can be used as per the
contents being beam by the transmission stations.
Receiver solid Antenna
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LNBLNB
Low noise block down converter is the antenna of what is commonlycalled the parabolic satellite dish commonly used in satellite TVreception.
LNB is the part of a satellite antenna which is positioned in front of thedish to receive the signal and converts the signal to be carried bycable to the receiver .
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A set-top box is a device that enables a television set to become a
user interface to the Internet and also enables a television set to
receive and decode digital television (DTV) broadcasts.
TV set-top boxes are sometimes called receivers. A set-top box isnecessary to television viewers who wish to use their current
analog television sets to receive digital broadcasts.
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Satellite TV involves receiving signals from a satellite where as cable TV
entails airing programs. The biggest difference between satellite and cableTV is the picture and sound quality. Unlike cable TV, satellite TV programs are
excellent quality with some of them being high definition. Here are some
guidelines that can help compare Dish Network with cable TV.
Dish network features, HD,
Dolby 5.1ch, CD sound,
superior picture quality with
huge nos of Channel access.
Dish tv has remote
geographical access with
limited installations.
Special features- recording and
play games , study aids for
children, and language and
home tutorial packages, with
movies on demand.
Average Accessed quality of
sound and picture, Limited
numbers of channels accessed.
Cable for subscriber is a
limited to wire but major to the
supplier with huge installation.
Cable TV had manual access
with least features but with
Cable modem net.
Dish TV
---C
able TV
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Cost effective communication,information and entertainment.
DTH services are transparent providing digital quality video,
audio, radio, and IP to all at equal prices and other benefits
with reliability
Doordarshan free-to-air services providing 40 TV channels withno subscription fees is an attractive preposition to people in
urban and rural areas.
A number of broadcasters has started IP broadcast with return
channel on PSTN line and this would be for education and other
application.
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DTH has made the hopes of the people of rural areas tocome true. It helps to develop and explore the ignited mind
of people of India to think beyond the scope of imagination.
It also helps to develop the economic conditions of a
country.
The DTH market in INDIA is relatively increasing day -by-
day, Major competitors like Airtel ,Reliance, TATA, Videocon
market clash would managed to overtake Japan as the
largest DTH market in Asia. In the next 5 years (by 2014-15)
DTH suscribers will increase by 30 million subscribers
.(which is about the same as the population of Belgium,
Portugal and Greece put-together.
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4.Login from:
www.google.com
www.autostream.com
1.Gagliardi R.M., Satellite communication, CBS Publishers, 1987
2.Rosie A.M., Information and communication theory, Van Nostrand, 1973
3.Raja rao K.N., Satellite communication, PHI,2004
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