Dtv captioning


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  • DTV Captioning

  • Transitioning from 608 to 708

  • Gerry Field, Manager

  • DTV Access Project

  • CPB/WGBH National Center for Accessible Media


  • DTV Stations On Air

  • 184 in 62 markets

  • as of March 8, 2001

  • http://www.nab.org/newsroom/pressrel/dtvstations.asp

  • 121 in March 2000



  • DTV Stations On Air

  • Simulcast, Upconversion of NTSC signals

  • Preservation of current services

  • Migration to native DTV programming and caption services





  • EIA-608B

  • Vertical Blanking Interval

  • Line 21

  • 960 bps

  • Field 1 = CC1, CC2, (T1, T2)

  • Field 2 = CC3, CC4, (T3, T4, XDS)



  • EIA-608B

  • Vertical Blanking Interval

  • Line 21

  • Field 1 Field 2

  • CC1=English CC3=Spanish

  • T2=iTV URLs XDS=Time, V-Chip



  • EIA-708B

  • MPEG-2

  • Picture User Data

  • DTVCC Transport Channel = 9600 bps

  • carries

  • 608 and 708 caption data

















  • DTV Closed Captioning Standards

  • and Related Documents

  • ATSC Standards

  • www.atsc.org

  • • A/53

  • ATSC Digital Television Standard (Sept 1995)

  • • A/52

  • ATSC Digital Television Audio Standard (Sept 1995)

  • • A/65

  • PSIP (Rev. A and Amend. No.1) (May 2000)



  • DTV Closed Captioning Standards

  • and Related Documents

  • CEA Standards

  • www.ce.org

  • Available through Global Engineering Documents

  • • EIA-608-B Line 21 Data Services (October 2000)

  • • EIA-708-B Digital Television Closed Captioning

  • (December 1999)

  • • EIA-CEB8 Consideration of EIA-608-B Data Within the DTV (EIA-708-B) Construct (October 2000)



  • DTV Closed Captioning Standards

  • and Related Documents

  • CEA Standards

  • www.ce.org

  • Available through Global Engineering Documents

  • EIA-CEB8

  • Preservation of NTSC Line 21 Data

  • Upconversion to DTV, transport, receiver, STB, analog out

  • Use of 608 Data by DTV Receivers

  • DTV devices should use 708, can use 608 if 708 not available

  • Independent Control of Audio and Caption Services



  • DTV Closed Captioning Standards

  • and Related Documents

  • SMPTE Standards

  • www.smpte.org

  • • SMPTE 333M-1999 Television

  • DTV Closed-Caption Server to Encoder Interface

  • • SMPTE 334M-2000 Television

  • Vertical Ancillary Data Mapping for Bit-Serial Interface

  • • SMPTE 341M-2000 Television

  • Format for Non-PCM Audio and Data in an AES3 Captioning Data Type (also see SMPTE 337M to 340M)





  • DTV Closed Captioning Standards

  • and Related Documents

  • Cable Television

  • SCTE Digital Video Subcommittee

  • ftp://ftp.cablelabs.com/pub/scte/dvs/pdf

  • • SCTE DVS 053r7

  • Standard for Carriage of NTSC VBI data in Cable

  • Digital Transport Streams (July 2000)

  • • SCTE DVS 157r1

  • Proposed Standard Methods for Carriage of Closed Captions and Non Real-Time Sampled Video (March 1999)



  • DTV Closed Captioning Standards

  • and Related Documents

  • Cable Television

  • http://www.opencable.com/specifications.html

  • OpenCable Set-top Terminal Functional Requirements

  • for Uni-Directional Cable

  • OpenCable Set-top Terminal Functional Requirements

  • for Bi-Directional Cable

  • OCI-N Cable Network Interface Specification
















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