DTh system

1. BITS Pilani
Hyderabad Campus
Mayank Garg
2013H140040H
Embedded System
BITS-Pilani, Hyderabad Campus
“DTH”

2. BITS Pilani, Hyderabad Campus
 Introduction
 History
 Constituents of DTH
 Basic principle of DTH
 Basic Block diagram & its Operation
 Cable TV Vs DTH TV
 Features of DTH
 DTH service providers
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CONTENTS

3. BITS Pilani, Hyderabad Campus
• The term DTH stands for ‘Direct To Home’.
• DTH television is a wireless system for delivering
television programs directly to the viewer’s house.
• ‡Defined as the reception of satellite programs with a
personal dish in an individual home.
• ‡DTH symbols the Transmission of digital video
channel to home subscribers through small dish
antenna.
INTRODUCTION
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5. BITS Pilani, Hyderabad Campus
Minidish antenna
LNBF
Coaxial cable
Connector
Set top box
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A DTH consists of:

6. BITS Pilani, Hyderabad Campus
• LNBF is the part of a satellite antenna which is positioned
in front of the dish to receive the signal and converts the
signal to be carried by cable to the receiver .
• Low noise block down converter is the antenna of what
is commonly called the parabolic satellite dish commonly
used in satellite TV reception.
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LNBF

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SET-TOP BOX

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• In DTH television , the broadcast signals are transmitted
from satellites orbiting the Earth to the viewer’s house.
• Each satellite is located approximately 35,700km above
the Earth in geosynchronous orbit.
• These satellites receive the signals from the broadcast
stations located on Earth and rebroadcast them to the
Earth.
• The viewer’s dish picks up the signal from the satellite
and passes it on to the receiver located inside the
viewer’s house.
• The receiver processes the signal and passes it on to
the television.
• The DTH television is used in millions of homes across
United States ,Europe and South East Asia.
BASIC PRINCIPLE

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OPERATION
• The block diagram of DTH TV system can be divided
into two sections:
 Outdoor Unit
 Indoor Unit
• OUTDOOR UNIT
• The outdoor unit consist of :
1) The parabolic satellite antenna
2) Low noise amplifier(LNA)
3) Converter

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Outdoor unit cont..
• The receiver antenna is a parabolic reflector horn
antenna which is directed directly to the satellite to
receive the signal.
• The received signal from satellite by the antenna is
applied to the low noise amplifier(LNA) which is a wide
band amplifier.
• LNA amplifies all the frequencies received from the
antenna and applies them to a converter. The second
input to this converter is from the local oscillator 1.
• The converter output consist of a UHF signal having a
frequency range from 950-1450 MHz with a bandwidth of
500 MHz.
• The output of converter is applied to the RF amplifier.

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INDOOR
• It consist of an RF amplifier which is applied to a
channel selector to select the desired channel with
the help of the mixer & local oscillator too.
• An IF frequency of 70MHz is produced.
• The RF amplifier applied these to video-audio
detector which separates the video , audio &
synchronous pulses.
• The TV receiver then works as usual.
• A DBS(Directly Broadcast Satellite) concept is used
in DTH system.

14. BITS Pilani, Hyderabad Campus
• Satellite TV involves receiving signals from a satellite
where as cable TV entails airing programs.
• The biggest difference between satellite and cable
TV 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.
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DTH Vs CABLE TV

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16. BITS Pilani, Hyderabad Campus
 DTH offers better quality picture than Cable TV.
 DTH can reach remote areas where terrestrial
transmission and cable TV have failed to penetrate.
 DTH has also allows for interactive TV services
such as movie-on-demand , and e-mail.
 In DTH, the payments will be made directly by the
subscriber to the satellite company offering the
service.
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SOME OF THE FEATURES OF DTH

17. BITS Pilani, Hyderabad Campus
India currently has 6 major DTH service providers
and a total of over 5 million subscriber households.
Tata group and Star network owned Tata Sky .
• Zee group owned Dish TV .
• Sun network owned SUNDIRECT DTH.
• Reliance owned BIG TV .
• Bharti Aritel's DTH .
• DD Direct Plus India - DTH Potential .
• DTH to grow from 3.2 mn in 2007 to 43 mn by
2015, with 30% share of Pay TV.
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DTH SERVICE PROVIDERS

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FUTURE PROSEPECTS OF DTH…
 Detection of Message Signal
 Triggering The Rectenna
 GSM Frequency In INDIA (900MHz Or 1800MHz)
 The DTH market in INDIA is relatively increase day -by-day. In the
past 5 months, two solid competitors like Airtel ,Reliance have
entered the market .
 In coming 5 years.... We have managed to overtake Japan as the
largest DTH market in Asia.
 In the next 2 years (by 2014) we will be able to add another 30
million subscribers .
(which is about the same as the population of Belgium, Portugal
and Greece put-together!)

19. BITS Pilani, Hyderabad Campus
• Doordarshan free-to-air services providing 40 TV
channels with no subscription fees is an attractive
preposition to people in urban and rural areas.
• A number has started IP broadcast with return
channel on PSTN line and this would be for education
and other application.
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DTH APPLICATION

20. BITS Pilani, Hyderabad Campus
• 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.
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DTH BENEFITS

21. BITS Pilani, Hyderabad Campus
TATA SKY
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Advantage and disadvantages of Top 4
service providers in India

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RELIANCE DIGITAL TV

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AIRTEL DIGITAL TV

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DISH TV

25. BITS Pilani, Hyderabad Campus
Thanks
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