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