direct to home
TRANSCRIPT
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DIRECT TO HOME
SHUBHANGI GARG07-EL-084
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INTRODUCTION
• DTH stands for direct to home • The reception of satellite
programs with a personal dish at the subscribers home.
• DTH does away with the need for the local cable operator and puts the broadcaster directly in touch with consumer.
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HISTORY
• 1996 >DTH services were first proposed in INDIA , but rejected due to concers over national security.
• 2000> DTH was allowed with new policy
• The operators were required to setup earth stations in india within 12 monts with a cost of $2.14 million valid for 10 years.
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How does DTH differ from cable tv?
• In DTH, TV channels would be transmitted from the satellite to a small dish antenna of the subscriber’s home.
• The broadcaster connects directly to the user eliminating middlemen like local cable operators.
• Dth can reach rural and remote areas easily.
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Why DTH?
• DTH offers better quality picture than cable TV. This is becausecable TV in India is analog. Despite digital transmission andreception, the cable transmission is still analog.
• DTH offersstereophonic sound effects.
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• It can also reach remote areas whereterrestrial transmission and cable TV have failed to penetrate.
• Apart from enhanced picture quality, DTH also allows interactive TV services such as movie-on-demand, Internet access, video conferencing and e-mail.
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GENERAL BLOCK DIAGRAM
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• Tunner :it selects a particular channel
in the range from 48 MHz to 860 MHz.
Demodulatorselected channel demodulated and the signal fed to decoder.
Decoder:it is the D to A converted, whose output is audio and video signal.
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• Microcontoroller:– It controls all the process
performed by each block.–Cas system: conditional access
systemThe channels are encrypted and the
viewers need to buy a set top box to decrypt it.
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–Working–The encoder converts the audio,
video and datasignals into the digital format and the multiplexer mixes thesesignals. At the user end, there will be a small dish antenna andset-top boxes to decode and view numerous channels. On theuser's end, receiving dishes can be as small as 45 cm indiameter.
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Basic DTH network concepts
• Transmission station• The transmission also known as
earth station is used to uplink the contents.
• TV channels would be transmitted from the satellite to a small dish antenna mounted on the window or rooftop of the subscriber’s home
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Receive terminal• Antenna.• Interface cables.• Set top box
Basic DTH network concepts
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Set top box
• A set top box or set top unit(STU) is a device that connects to a television and an external source of signal,converting into content which is then displayed on the television screen
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The channels
• Satellite TV providers get programming from two major sources: International turnaround channels (such as HBO, ESPN and CNN, STAR TV, SET, B4U etc) and various local channels (SaBe TV, Sahara TV, Doordarshan, etc).
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• The broadcast center uses large satellite dishes to pick up these analog and digital signals from several sources.
The channels
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THANK YOU