Transcript The Challenge of Testing DTV Systems

Testing 608 and 708
Closed Caption Streams
MPEG
DVB
ATSC
By Stephane Billat
Application Engineer
Sencore Inc
DTV
HDTV
SDTV
MPEG
3/14/01
Sencore Inc, 2001
1
MPEG
DVB
ATSC
DTV
The CC Technical Challenge
Insert Closed Caption into ATSC Streams and
recover them for use on ATSC compatible
displays
HDTV
SDTV
MPEG
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MPEG
DVB
ATSC
DTV
The CC Technical Challenge
Insert Closed Caption into ATSC Streams and
recover them for use on ATSC compatible
displays
HDTV
SDTV
Problem: ATSC CC is new, powerful,
complex, has almost unlimited combinations.
MPEG
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Sencore Inc, 2001
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MPEG
DVB
ATSC
DTV
HDTV
The CC Technical Challenge
Insert Closed Caption into ATSC Streams and
recover them for use on ATSC compatible
displays
Problem: ATSC CC is new, powerful,
complex, has almost unlimited combinations.
SDTV
MPEG
Solution: Need for independent testing
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MPEG
CC in the ATSC Stream
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
Analog 608 CC
DVB
ATSC
Field-1 / Channel-1 services
•
DTV
•
CC1=Primary caption service
CC2=Special non-sync caption service
HDTV
SDTV
MPEG
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MPEG
Analog 608 CC
DVB
ATSC
Field-1 / Channel-1 services
•
DTV
•
HDTV
SDTV
•
•
•
MPEG
CC1 = Primary caption service
CC2= Special non-sync caption service
T1 = First text service 15-row text box over all
screen
T2 = Second text service (WEB TV)
T2 in field-1 is also used for the EIA-746
transmission of Web Url: www.sencore.com.
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MPEG
Analog 608 CC
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
Analog 608 CC
DVB
ATSC
Field-2 / Channel-2 services
•
DTV
•
CC3 = Alternative language-1
CC4 = Alternative language-2
HDTV
SDTV
MPEG
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MPEG
Analog 608 CC
DVB
ATSC
Field-2 / Channel-2 services
•
DTV
•
HDTV
•
•
SDTV
•
CC3 = Alternative language-1
CC4 = Alternative language-2
T3 = Third text service unused at present
T4 = Fourth text service unused at present
XDS
MPEG
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MPEG
Analog 608 CC features
DVB
ATSC
DTV
•
•
•
HDTV
•
•
Roll Up
Pop on
Background color
Few special effect
Limited in bandwidth
SDTV
MPEG
3/14/01
Sencore Inc, 2001
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MPEG
Analog 608 CC
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
Digital 708 CC Features
DVB
ATSC
•
•
Multiple windows (7)
Many effects
DTV
Drop shadow
Translucent
Different types of borders.
Pen types
Fonts
Languages
HDTV
SDTV
MPEG
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MPEG
Digital 708 CC
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
Digital 708 CC
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
DVB
708 Window Definition View
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
708 Window Style View
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
708 Pen Style View
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
CC logs creation
DVB
ATSC
DTV
HDTV
SDTV
MPEG
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MPEG
Other Features
DVB
ATSC
DTV
HDTV
SDTV
MPEG
• Select display mode in presentation or decode order.
• Useful in establishing delay in the insertion & its
relation to the picture.
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MPEG
Conclusion
DVB
ATSC
•
CC708 includes 608 and new CC
DTV
HDTV
SDTV
MPEG
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MPEG
Conclusion
DVB
ATSC
•
CC708 includes 608 and new CC
•
Challenge: Insertion into ATSC Stream
DTV
HDTV
SDTV
MPEG
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MPEG
Conclusion
DVB
ATSC
•
CC708 includes 608 and new CC
•
Challenge: Insertion into ATSC Stream
•
Need for CC independent testing
DTV
HDTV
SDTV
MPEG
3/14/01
Sencore Inc, 2001
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MPEG
For More Information
DVB
ATSC
Side of the room demo of
Analysis CC stream
Or
Contact Stephane Billat
1-800-SENCORE x279
[email protected]
DTV
HDTV
SDTV
MPEG
3/14/01
Sencore Inc, 2001
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