Dth.ppt by Himani
- 1. WELCOME Presentation On DIRECT TO HOME
- 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
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- 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
- 10. DTH Receive Facility Cable Head-end Private Home Private Home Private Home
- 11. PLAYER’S IN D.T.H DISH T.V • D.D. DIRECT TATA SKY BIG T.V SUN DIRECT VIDEOCON d2h AIRTEL DIGITAL TV 11
- 12. 83 INSAT 4A 91.5 MEASAT 74 INSAT 4CR 93.5 INSAT 4B 95 NSS ST1 98.5 PROTOSTAR-1 INDIAN DTH SUBSCRIBER DTH SATELLITE SCENARIO YEAR 2009 12
- 13. GROWTH OF DTH USERS 2007 to 2015…Growth of 683 % 13
- 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. 15
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Editor's Notes
- #9: 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.