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CPB/WGBH National Center for Accessible Media

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Presentation on theme: "CPB/WGBH National Center for Accessible Media"— Presentation transcript:

1 CPB/WGBH National Center for Accessible Media
DTV CAPTION SUMMIT March 14, 2001, Washington, DC DTV Captioning Transitioning from 608 to 708 Gerry Field, Manager DTV Access Project CPB/WGBH National Center for Accessible Media

2 DTV Stations On Air 184 in 62 markets as of March 8, 2001
DTV CAPTION SUMMIT March 14, 2001, Washington, DC Gerry Field, WGBH-NCAM DTV Stations On Air 184 in 62 markets as of March 8, 2001 121 in March 2000

3 DTV Stations On Air Simulcast, Upconversion of NTSC signals
DTV CAPTION SUMMIT March 14, 2001, Washington, DC Gerry Field, WGBH-NCAM DTV Stations On Air Simulcast, Upconversion of NTSC signals Preservation of current services Migration to native DTV programming and caption services

4 Production Contribution Distribution Emission Reception Decode Display
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Production Contribution Distribution Emission Reception Decode Display

5 Vertical Blanking Interval
DTV CAPTION SUMMIT March 14, 2001, Washington, DC Gerry Field, WGBH-NCAM EIA-608B Vertical Blanking Interval Line 21 960 bps Field 1 = CC1, CC2, (T1, T2) Field 2 = CC3, CC4, (T3, T4, XDS)

6 Vertical Blanking Interval Line 21 Field 1 Field 2
DTV CAPTION SUMMIT March 14, 2001, Washington, DC Gerry Field, WGBH-NCAM EIA-608B Vertical Blanking Interval Line 21 Field Field 2 CC1=English CC3=Spanish T2=iTV URLs XDS=Time, V-Chip

7 DTVCC Transport Channel = 9600 bps
DTV CAPTION SUMMIT March 14, 2001, Washington, DC Gerry Field, WGBH-NCAM EIA-708B MPEG-2 Picture User Data DTVCC Transport Channel = 9600 bps carries 608 and 708 caption data

8 Caption Data in an ATSC Transport Stream
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Caption Data in an ATSC Transport Stream

9 Interface of Caption Data to ATSC Emission Encoding Equipment
DTV CAPTION SUMMIT March 14, 2001 Washington, DC M U X Video Encoder DTVCC Data Caption Service Information PSIP Generator Transport Stream PMT Generator EIA-708B - Figure 21 - Interface of Caption Data to ATSC Emission Encoding Equipment

10 DTV CAPTION SUMMIT March 14, 2001 Washington, DC

11 DTV CAPTION SUMMIT March 14, 2001 Washington, DC

12 DTV CAPTION SUMMIT March 14, 2001 Washington, DC

13 DTV CAPTION SUMMIT March 14, 2001 Washington, DC

14 DTV Closed Captioning Standards
DTV CAPTION SUMMIT March 14, 2001 Washington, DC DTV Closed Captioning Standards and Related Documents FCC Rules • 47 CFR Part Decoder Requirements, Analog Television • 47 CFR Part Decoder Requirements, Digital Television • 47 CFR Part 79 Programming Requirements

15 DTV Closed Captioning Standards
DTV CAPTION SUMMIT March 14, 2001 Washington, DC DTV Closed Captioning Standards and Related Documents ATSC Standards • 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)

16 and Related Documents CEA Standards
DTV CAPTION SUMMIT March 14, 2001 Washington, DC DTV Closed Captioning Standards and Related Documents CEA Standards 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)

17 and Related Documents CEA Standards
DTV CAPTION SUMMIT March 14, 2001 Washington, DC DTV Closed Captioning Standards and Related Documents CEA Standards 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

18 DTV Closed Captioning Standards
DTV CAPTION SUMMIT March 14, 2001 Washington, DC DTV Closed Captioning Standards and Related Documents SMPTE Standards • 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 AES Captioning Data Type (also see SMPTE 337M to 340M)

19 Local Emission Station
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Local Emission Station Caption Encoding

20 DTV Closed Captioning Standards and Related Documents Cable Television
DTV CAPTION SUMMIT March 14, 2001 Washington, DC 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)

21 DTV Closed Captioning Standards
DTV CAPTION SUMMIT March 14, 2001 Washington, DC DTV Closed Captioning Standards and Related Documents Cable Television OpenCable Set-top Terminal Functional Requirements for Uni-Directional Cable for Bi-Directional Cable OCI-N Cable Network Interface Specification

22 shall be passed through to a DTV display via the IEEE-1394 interface.
DTV CAPTION SUMMIT March 14, 2001 Washington, DC STT-BDI-C-52 and STT-UDI-C-49: All set-top terminals submitted to Cable Labs for certification for delivery after July 1, 2002 shall process the Digital Television (DTV) Closed Captioning information, when available in the MPEG-2 Picture User Data, as specified in EIA-708B, section 9 and delivered according to ATSC A/53 amendment 1 (with cc_type set to '10' or '11'). This caption data, when present, shall be passed through to a DTV display via the IEEE-1394 interface. If the set top terminal provides component analog or uncompressed digital output streams, decoding and display of this caption data shall be provided by the set top terminal according to FCC rules part If the set top terminal provides an NTSC analog video output, and the network stream dual carries EIA-608B caption data transported according to SCTE DVS053r7 or DVS 157r1, then the set top terminal shall reconstruct line 21 VBI in the analog output as required by FCC rules part (a)(2).

23 DTV Caption Test Bitstreams NCAM DTV Access Project
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Current Developments DTV Caption Test Bitstreams CEA R4.3 WG1 DTV Station Project NCAM DTV Access Project ATSC/CEA Plugfests June, September 2000 January 2001 Spring/Summer 2001

24 Caption Encoder Product
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Current Developments Caption Encoder Product Local Emission Network Distribution VANC in 292

25 Current Developments Education Activities ATSC IS S3 Working Group
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Current Developments Education Activities ATSC IS S3 Working Group Distribution Models CDP Tutorial Caption File Format Web Based Resources

26 Additional Test Materials Cable Interoperability
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Current Developments Education Activities CEA R4.3 WG1 Additional Test Materials 708 Implementation Guide Cable Interoperability

27 Working Group Conference Calls
DTV CAPTION SUMMIT March 14, 2001 Washington, DC Follow Up to the Summit Web Resources Working Group Conference Calls Coordination of ATSC, CEA, SMPTE, SCTE efforts

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