2. CONTENTS
Introduction
History of DTH
Main Components
Network
Facility
Different usage
Scenario in India
Conclusion
References
2
3. What is DTH ?
DTH is defined as:
The reception of satellite programs with a
personal dish in an individual home.
DTH does away with the need for the local cable
operator and puts the broadcaster directly in touch
with consumer .
A wireless digital audio / video service is
delivered through satellite. 3
4. HISTORY
• The first person who invented the technology for DTH was
sir ARTHURE CLARLES CLARKE , a british inventor in
late 1946.
• The DTH service was first proposed in INDIA in 1996 , but
was not approved due to concern over national security.
• Finally , In 2000 DTH service was allowed and
DOORDARSHAN was first to provide the service to
the consumers from 1st of April ,2000.
• After this other DTH service provider like ZEE and STAR
started pushing hard for DTH service in INDIA and setup
earth station whose cost was 2.15 million and was valid
for 10 years in INDIA.
4
5. MAIN COMPONENTS OF DTH
Broadcasting center
Satellites Encoders
Multiplexers
Modulators
DTH receivers.
5
7. Real Time TV services
PROCESS
Enc1
Enc2 MUX
QPSK
Modulator
Content “on demand” servers Services uplinked
to Satellites
Services downlinked via
receive satellite dish
and fed in to STB
8. BLOCK DIAGRAM OF DTH SYSTEM
Low noise block
Amplifier
down converter
Low noise Down Down Filter
amplifier Converter Converter
Video
baseband
Tunable Demodu
Channel selector Local lator
Channel selector
Oscillator
TV SET
9. SET TOP BOX
A settop box can
demodulate the
received signal and
can convert these
signal into audio and
video signal.
9
14. LATEST IN DTH IN INDIA
Recording of TV programs
remotely using mobile
device.
14
15. CONCLUSION
DTH has made the hopes of the people of rural
areas to come true.
DTH service in India is in initial stage delivering
only TV broadcasting
In near future, launch of DTH internet service is
expected in our country.
It provide the wide thinking of rural people
which helps to develop the culture of society.
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To understand the type of instruments needed for confidence monitoring, we need to understand a key way digital television differs from analog television. <MC> As we see in this diagram, digital television systems use various digital signal processing and digital data processing techniques to improve quality and efficiency. Key techniques include: sampling, quantizing, and formatting the digital signal in conformance to standards using MPEG compression techniques to reduce bandwidth requirements combining multiple programs into a single stream and adding control information using digital modulation and demodulation techniques for broadcast transmission using network protocols for distribution over fiber or copper networks, and decoding and formatting the video and audio information for presentation. During the journey from source to destination, you may need to route or regenerate the signal. In the process, content may move up and down through these layers and may be remultiplexed, or may change format. We can best understand how these different processing steps interact and impact broadcast quality by organizing them into a layered model. Specifically, we can use three layers to model a digital television broadcast system. <MC> In the first layer we need to ensure the proper formatting of the digital video and audio signal, <MC> in the next layer we need to ensure these signals are correctly compressed and aggregated together, and <MC> in the last layer, we need to ensure the signals are properly distributed or transmitted.
