MSTs ITV Delivery System - PowerPoint PPT Presentation

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MSTs ITV Delivery System

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Minimize complexity on part of DTV encoder/transport multiplexer. DTV 708 DTVCC Data Server ... Easy to use on-screen menus. Optional modem, LAN interface ... – PowerPoint PPT presentation

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Title: MSTs ITV Delivery System


1
Mixed Signals Approach to Encoding DTV Closed
Captions
2
Transcoding
EIA-708
EIA-608
DTVCC Captions
Transcoder
Line 21 NTSC Captions
Legacy Captions
3
Transcoding at Time-of-Air
  • Advantages
  • Uses existing line 21 captions
  • Technique currently in use by dozens of DTV
    broadcasters
  • Works with both Standard Definition and HD
    programs
  • Low cost

4
Application 1
Time-of-Air Encoding From D1 Source
5
Application 2
Time-of-Air Encoding From Composite Source
6
Application 3
HDTV Live or Off-Line Encoding
7
SMPTE 333M Interface
  • DTV Closed Caption Server to ATSC Encoder
    Interface
  • Objectives
  • Ensure captions are displayed at exactly the time
    intended by caption creator
  • Guarantee all four NTSC caption bytes are
    transmitted each picture
  • Maintain allowed DTVCC transport rate of 9600 bps
  • Minimize complexity on part of DTV
    encoder/transport multiplexer

8
DTV 708 DTVCC Data Server
  • DTV 708
  • Features
  • Built-in closed caption decoder, LTC time code
    reader, bidirectional GPI
  • Easy to use on-screen menus
  • Optional modem, LAN interface
  • Able to read caption files including emerging
    native EIA-708 files

9
Thank You! What can we do to help DTVCC closed
captioning?
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