seminar dth

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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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