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Bit Management John Watkinson David Felland Jim Kutzner

Bit Management John Watkinson David Felland Jim Kutzner. John Watkinson.

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Bit Management John Watkinson David Felland Jim Kutzner

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  1. Bit Management John Watkinson David Felland Jim Kutzner

  2. John Watkinson John Watkinson is an international consultant in audio, video and data recording. He is a Fellow of the AES, a member of the British Computer Society and a chartered information systems practitioner. He presents lectures, seminars, conference papers and training courses worldwide. He is the author of the Kraszna-Krausz award winning “MPEG-2” book; The Art of Digital Audio; An Introduction to Digital Video; The Art of Sound Reproduction; An Introduction to Digital Audio; TV Fundamentals and Audio for Television. He is also co-author, with Francis Rumsey, of The Digital Interface Handbook, and contributor to the Loudspeaker and Headphone Handbook, 3rd edition. San Francisco Public Television Quality Workshop

  3. Bit Management • How compression works and how it doesn't work • Efficient things to do in a compressed environment • Signal formats that work with compression and multi-resolution and those that don't

  4. Bit Management • Why less can be more • Why compression is not a production tool • Bringing generation loss back to the digital domain

  5. OTA Bit Management • New impacts on your transport stream • Better coding efficiency in new HD encoders • Claims of 10-15% improvement realized • 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

  6. Sampling of Current Practice • Surveyed the ETAC • 1-3 OTA services • Different services plans among all members • Focus on HD + national/local SD services HD rates range from 10 - 17 Mb/s

  7. ETAC Members’ OTA Pink = Stat Mux Pool

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

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

  14. Video Examples San Francisco Public Television Quality Workshop

  15. Questions? San Francisco Public Television Quality Workshop

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