dth system

BITS PilaniHyderabad Campus

Mayank Garg2013H140040H

Embedded System BITS-Pilani, Hyderabad Campus

“DTH”

BITS Pilani, Hyderabad CampusMayank Garg

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

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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BITS Pilani, Hyderabad CampusMayank Garg Slide 4


Minidish antennaLNBFCoaxial cableConnector Set top box

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A DTH consists of:


• 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


SET-TOP BOX


• 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


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 antenna2) Low noise amplifier(LNA)3) Converter


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.


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.


• 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 excellentquality 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


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


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


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!)


•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


• 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


TATA SKY

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Advantage and disadvantages of Top 4 service providers in India


RELIANCE DIGITAL TV


AIRTEL DIGITAL TV


DISH TV


Thanks

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Link to connect with author:

http://www.slideshare.net/MayankGarg25https://www.linkedin.com/in/gargmayankhttp://www.researchgate.net/profile/Mayank_Garg6/ https://www.facebook.com/mayank17692?ref=hl

https://www.google.co.in/




dth system

Engineering