DTH System


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DTH System

  1. 1. BITS Pilani Hyderabad Campus Mayank Garg 2013H140040H Embedded System BITS-Pilani, Hyderabad Campus “DTH”
  2. 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 Mayank Garg Slide 2 CONTENTS
  3. 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 Mayank Garg Slide 3
  4. 4. BITS Pilani, Hyderabad CampusMayank Garg Slide 4
  5. 5. BITS Pilani, Hyderabad Campus Minidish antenna LNBF Coaxial cable Connector Set top box Mayank Garg Slide 5 A DTH consists of:
  6. 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. Mayank Garg Slide 6 LNBF
  7. 7. BITS Pilani, Hyderabad CampusMayank Garg Slide 7 SET-TOP BOX
  8. 8. BITS Pilani, Hyderabad CampusMayank Garg Slide 8 • 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
  9. 9. BITS Pilani, Hyderabad CampusMayank Garg Slide 9
  10. 10. BITS Pilani, Hyderabad CampusMayank Garg Slide 10
  11. 11. BITS Pilani, Hyderabad CampusMayank Garg Slide 11 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
  12. 12. BITS Pilani, Hyderabad CampusMayank Garg Slide 12 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.
  13. 13. BITS Pilani, Hyderabad CampusMayank Garg Slide 13 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. 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. Mayank Garg Slide 14 DTH Vs CABLE TV
  15. 15. BITS Pilani, Hyderabad CampusMayank Garg Slide 15
  16. 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. Mayank Garg Slide 16 SOME OF THE FEATURES OF DTH
  17. 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. Mayank Garg Slide 17 DTH SERVICE PROVIDERS
  18. 18. BITS Pilani, Hyderabad CampusMayank Garg Slide 18 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. 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. Mayank Garg Slide 19 DTH APPLICATION
  20. 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. Mayank Garg Slide 20 DTH BENEFITS
  21. 21. BITS Pilani, Hyderabad Campus TATA SKY Mayank Garg Slide 21 Advantage and disadvantages of Top 4 service providers in India
  22. 22. BITS Pilani, Hyderabad CampusMayank Garg Slide 22 RELIANCE DIGITAL TV
  23. 23. BITS Pilani, Hyderabad CampusMayank Garg Slide 23 AIRTEL DIGITAL TV
  24. 24. BITS Pilani, Hyderabad CampusMayank Garg Slide 24 DISH TV
  25. 25. BITS Pilani, Hyderabad Campus Thanks Mayank Garg Slide 25 Link to connect with author: http://www.slideshare.net/MayankGarg25 https://www.linkedin.com/in/gargmayank http://www.researchgate.net/profile/Mayank_Garg6/ https://www.facebook.com/mayank17692?ref=hl