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Over-the-Air (OTA) Bit Management David Felland

Over-the-Air (OTA) Bit Management David Felland. OTA Bit Management. New impacts on your transport stream Better coding efficiency in new HD encoders Claims of 10-15% improvement Potential for two 720p HD services in one transport stream – or other services

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Over-the-Air (OTA) Bit Management David Felland

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  1. Over-the-Air (OTA) Bit Management David Felland

  2. OTA Bit Management New impacts on your transport stream Better coding efficiency in new HD encoders Claims of 10-15% improvement Potential for two 720p HD services in one transport stream – or other services More SD services from which to choose Mobile DTV Fixed and Mobile DTV Data Services

  3. OTA Bit Management Options for broadcasters Reduced horizontal resolution (1440 vs 1920) Noise reduction of both HD and SD Modern statistical multiplexing 720p vs. 1080i X X ☺ ☺

  4. Sampling of Current Practice Surveyed the ETAC 1-3 OTA services Different services plans among all members Focus on HD + national/local SD services Surveyed the Washington stations Commercial stations have a much more consistent approach: HD + Weather (and perhaps one other service)

  5. ETAC Members’ OTA Italics = Stat Mux Pool

  6. ETAC Members’ OTA (x4) (x2) (x2) Italics = Stat Mux Pool

  7. ETAC Members’ OTA Italics = Stat Mux Pool

  8. ETAC Members’ OTA (x2) Italics = Stat Mux Pool

  9. ETAC Members’ OTA Italics = Stat Mux Pool

  10. Comparison of Video Performance Clip #1: 1080i @ 14 Mbps (MV500) Clip #2: 1080i @ 12 Mbps (MV500) Clip #3: 1080i @ 10 Mbps (MV500) Clip #4: 720p @ 12 Mbps (MV500) Clip #5: 720p @ 10 Mbps (MV500) Clip #6: 720p @ 8 Mbps (MV500) Clip #7: 720p @ 9 Mbps (Electra 8000)

  11. Mobile DTV Bandwidth UsageHow much OTA spectrum is needed? Mobile / Handheld service requirements Multiple modes – e.g., “Half-rate”, “Quarter-rate”, or a variety of “Mixed Modes” Many broadcasters will use Quarter or Mixed Quarter  ~17% payload (83% FEC) Mixed (e.g., ½, ¼, ¼, ¼)  ~ 26% (74% FEC) Half  ~34% payload (66% FEC)

  12. Bandwidth Usage (bits)How much OTA spectrum is needed? Mixed Mode examples (26%): One 500 kbps stream  ~1.92 Mbps Video@400kbps; Audio@64kbps; Data@30kbps Two 500 kbps streams  ~3.85 Mbps Quarter Rate examples (17%): One 500 kbps stream  ~2.94 Mbps Video@400kbps; Audio@64kbps; Data@30kbps Two 500 kbps streams  ~5.88 Mbps

  13. DTV Spectrum Usage:ETAC Member #1 128 kbps • Data/Ancillary • PSIP 150 kbps ~3 Mbps • SD program 19.4 Mb/s DTV Transport Stream ~15 Mbps Stat Mux Pool • HD program

  14. DTV Spectrum Usage:ETAC Member #2 1Mbps+128 kbps • Data/Ancillary • PSIP 250 kbps ~2.5 Mbps • SD program 19.4 Mb/s DTV Transport Stream ~2.5 Mbps • SD program ~12 Mbps Stat Mux Pool • HD program

  15. ETAC Member #1:One Mobile Service (Mixed) ~2 Mbps • Mobile program 128 kbps • Data/Ancillary • PSIP 150 kbps ~2.5 Mbps • SD program 19.4 Mb/s DTV Transport Stream ~13.5 Mbps Stat Mux Pool • HD program

  16. ETAC Member #2:One Mobile Service (Mixed) ~2 Mbps • Mobile program 1Mbps+128 kbps • Data/Ancillary • PSIP 250 kbps 19.4 Mb/s DTV Transport Stream ~2 Mbps • SD program ~2 Mbps • SD program ~11 Mbps Stat Mux Pool • HD program

  17. Some Mobile Services Simulcast of Local HD or SD Services Simulcast of National HD or SD Services Stand alone Local Mobile Services National or Local Kids Service “Radio” Services Audio Only – 16 – 48 kbps “Audio with Pictures” – same as Video/Audio

  18. DTV Spectrum Usage:ETAC Member #14 1Mbps • Data/Ancillary • PSIP 150 kbps ~3 Mbps • SD program 19.4 Mb/s DTV Transport Stream ~3 Mbps • SD program Stat Mux Pool ~10 Mbps • HD program

  19. ETAC Member #14:Multiple Mobile Services (Mixed) ~2 Mbps • Mobile program ~2 Mbps • Mobile program • Radio Services (100k) 1Mbps • Data/Ancillary 19.4 Mb/s DTV Transport Stream • PSIP 250 kbps • SD program ~1.8 Mbps • SD program ~1.8 Mbps Stat Mux Pool ~9.5 Mbps • HD program

  20. Other Stations:Possible Mobile Services (Mixed) ~2 Mbps • Mobile program ~2 Mbps • Mobile program ~2 Mbps • Mobile program • PSIP 250 kbps 19.4 Mb/s DTV Transport Stream • Weather ~2 Mbps ~11 Mbps Stat Mux Pool • HD program

  21. Other Stations:Possible Mobile Services (1/4 rate) ~3 Mbps • Mobile program ~3 Mbps • Mobile program • PSIP 250 kbps 19.4 Mb/s DTV Transport Stream • Weather ~2 Mbps ~11 Mbps Stat Mux Pool • HD program

  22. Other Stations:Possible Mobile Services (Mixed) • Mobile program ~2 Mbps • Mobile program ~2 Mbps • Mobile program ~2 Mbps • Mobile program ~2 Mbps 19.4 Mb/s DTV Transport Stream • Mobile program ~2 Mbps • Mobile program ~2 Mbps • Mobile program ~2 Mbps • PSIP 100 kbps ~4.5 Mbps • SD program

  23. Public television has used its spectrum to serve diverse audiences with more variety in content (“multicasting”) Pluses: greater range of services; potential higher value to individual communities Minuses: locked into audience expectations; stations are forced to balance video quality with service quantity Observations:

  24. Observations : Many stations are moving to 720p replacing spatial resolution with temporal resolution Significantly reducing their blocking artifacts Reducing horizontal resolution With an increase in demand for more services stations can improve their performance by Moving to 720p Replacing their HD encoders with the next generation

  25. Video Examples

  26. Questions?

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