Direct to home
Broadcast (DTH):
DTH
stands for Direct-To-Home television. DTH is defined as the reception of
satellite programmes with a personal dish in an individual home.
DTH Broadcasting to home TV receivers take place in the ku band(12 GHz). This
service is known as Direct To Home service.
DTH services were first proposed in India in 1996.
Finally in 2000, DTH was allowed.
The new policy requires all operators to set up earth stations in India within
12 months of getting a license. DTH licenses in India will cost $2.14 million
and will be valid for 10 years.
Working
principal of DTH is the satellite communication. Broadcaster modulates the
received signal and transmit it to the satellite in KU Band and from satellite
one can receive signal by dish and set top box.
1. DTH Block
Diagram:
A DTH network consists of a broadcasting centre, satellites, encoders,
multiplexers, modulators and DTH receivers
The encoder converts the audio, video and data signals into the digital format
and the multiplexer mixes these signals.
It
is used to provide the DTH service in high populated area A Multi Switch is
basically a box that contains signal splitters and A/B switches. A outputs of
group of DTH LNBs are connected to the A and B inputs of the Multi Switch.
2. Advantage:
DTH also offers digital quality signals which do not degrade the picture or
sound quality.
It also offers interactive channels and program guides with customers having
the choice to block out programming which they consider undesirable
One of the great advantages of the cable industry has been the ability to
provide local channels, but this handicap has been overcome by many DTH
providers using other local channels or local feeds.
The other advantage of DTH is the availability of satellite broadcast in rural
and semi-urban areas where cable is difficult to install.
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