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Bit ManagementJohn Watkinson
David Felland
Jim Kutzner
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John WatkinsonJohn 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.
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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
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Bit Management Why less can be more
Why compression is not a production tool
Bringing generation loss back to the digital domain
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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 servicesMore SD services from which to chooseMobile DTVFixed and Mobile DTV Data Services
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Sampling of Current Practice Surveyed the ETAC
1-3 OTA servicesDifferent services plans among all membersFocus on HD + national/local SD services
HD rates range from 10 - 17 Mb/s
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HD SD1 SD2 SD3 SD4 PSIP Data
#13 11 6 - - - 180k 128k
#14 10 3 3 - - 150k 1M+
300k
ETAC Members’ OTA
Pink = Stat Mux Pool
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DTV Spectrum Usage:ETAC Member #1
~15 Mbps
~3 Mbps
150 kbps128 kbps
• HD program
• PSIP• SD program
• Data/Ancillary
19
.4 M
b/s
DT
V T
ran
sp
ort
S
tre
am
Sta
t M
ux
Po
ol
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DTV Spectrum Usage:ETAC Member #2
~12 Mbps
~2.5 Mbps250 kbps
1Mbps+128 kbps
• HD program
• PSIP
• SD program
• Data/Ancillary
~2.5 Mbps • SD program
19
.4 M
b/s
DT
V T
ran
sp
ort
S
tre
am
Sta
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Po
ol
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ETAC Member #1:One Mobile Service (Mixed)
~13.5 Mbps
19
.4 M
b/s
DT
V T
ran
sp
ort
S
tre
am
~2.5 Mbps
150 kbps128 kbps
• HD program
• PSIP• SD program
• Data/Ancillary~2 Mbps • Mobile program
Sta
t M
ux
Po
ol
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ETAC Member #2:One Mobile Service (Mixed)
~11 Mbps
~2 Mbps250 kbps
1Mbps+128 kbps
• HD program
• PSIP• SD program
• Data/Ancillary
~2 Mbps • SD program
19
.4 M
b/s
DT
V T
ran
sp
ort
S
tre
am
Sta
t M
ux
Po
ol
~2 Mbps • Mobile program
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DTV Spectrum Usage:ETAC Member #14
~10 Mbps
~3 Mbps
150 kbps
1Mbps
• HD program
• PSIP• SD program
• Data/Ancillary
~3 Mbps • SD program
19
.4 M
b/s
DT
V T
ran
sp
ort
S
tre
am
Sta
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ux
Po
ol
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OTA Bit Management Options for broadcasters
Reduced horizontal resolution (1440 vs 1920)Noise reduction of both HD and SD720p vs. 1080i☺☺
XXXX
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Video Examples
San Francisco Public Television Quality Workshop
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Questions?
San Francisco Public Television Quality Workshop