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DTV CAPTION SUMMIT 14 MARCH 01 SESSION ON NEXT STEPS norpak corporation

DTV CAPTION SUMMIT 14 MARCH 01 SESSION ON NEXT STEPS norpak corporation. CAPTION DELIVERY ARCHITECTURE. LOCAL STATION MAY ADD LOCAL CAPTION DATA. CAPTIONS ADDED TO ORIGINAL PROGRAM. NETWORK MAY ADD CAPTIONING DATA. CAPTION CREATION. NETWORK HEADEND. LOCAL STATION. Broadcast.

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DTV CAPTION SUMMIT 14 MARCH 01 SESSION ON NEXT STEPS norpak corporation

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  1. DTV CAPTION SUMMIT14 MARCH 01SESSION ON NEXT STEPSnorpak corporation

  2. CAPTION DELIVERY ARCHITECTURE LOCAL STATION MAY ADD LOCAL CAPTION DATA CAPTIONS ADDED TO ORIGINAL PROGRAM NETWORK MAY ADD CAPTIONING DATA CAPTION CREATION NETWORK HEADEND LOCAL STATION Broadcast CONTRIBUTION DISTRIBUTION Videotape

  3. TES7 CAPTIONING FORMATS Encoding Bridging to MPEG Decoding descriptors

  4. VTR VTR TES7 Encoder 608 Caption Server Videotape Videotape DATA DELIVERY (CAPTION CREATION) CAPTION CREATION CAPTION CREATION NETWORK HEADEND LOCAL STATION Broadcast CONTRIBUTION DISTRIBUTION

  5. Routing Compressor VTR 259M Server MPEG Encoder & MUX TES7 TES7 ADB7 Videotape Videotape DATA DELIVERY (NETWORK) 292M Contri- bution 292M 292M Distri- bution MPEG DECODE & DEMUX 292M 292M 292M CAPTION CREATION NETWORK HEADEND LOCAL STATION Broadcast CONTRIBUTION DISTRIBUTION

  6. Routing Compressor PSIP Gen VTR 259M Server MPEG Encoder & MUX TES7 TES7 ADB7 Videotape Videotape DATA DELIVERY (STATION) 292M Distri- bution 292M 292M MPEG DECODE & DEMUX Broadcast 292M 292M 292M CAPTION CREATION NETWORK HEADEND LOCAL STATION Broadcast CONTRIBUTION DISTRIBUTION

  7. TES7 • SMPTE334 data on SMPTE292 ‘baseband, HD video • Captioning EIA608/708 and ‘native’ EIA708B • Transparent mode • Bridge mode to feed compression systems

  8. TES7 STANDARDS TES7 272M Audio (HANC) 334M VANC mapping 299M HDTV audio (HANC) ANCILLARY DATA 291M ANC data TES7 TES7 TES7 VIDEO FORMATS (selected) 125M SD video 305M “packet data” i.e. MPEG 267M SD 16:9 274M 1920x1080I 296M 1280x720P BIT-SERIAL INTERFACES 259M 270 & 360 Mbs TES7 292M 1.485 Gbs

  9. ANCILLARY DATA FORMAT LUMINANCE : 1920 OR 1280 BYTES ACTIVE PICTURE DATA VANC CHROMINANCE : 1920 OR 1280 BYTES HANC ANC PACKET 7-262 BYTES ANC PACKET 7-262 BYTES ANC PACKET 7-262 BYTES ADF (3) DID SDID DC DATA PAYLOAD 0-255 BYTES CS

  10. VANC THROUGHPUT • EACH LINE OF LUMA OR CHROMA CARRIES: • 1920 X 60 = 115.2K BYTES/SEC (274M) • 1280 X 60 = 76.8K BYTES/SEC (296M) • EACH LINE CARRIES: • 115.2K X 2 = 230.4K BYTES/SEC (274M) • 76.8K X 2 = 153.6K BYTES/SEC (296M) • VANC SPACE CONTAINS: • 274M : LINES 1-20, MINUS 2 SWITCHING = 18 LINES • 296M : LINES 1-25, MINUS 2 SWITCHING = 23 LINES

  11. BRIDGES • DEDICATED • VDB7 – analogue 608 to compression system 708 • ADB7 – SMPTE 292/259/292 HD baseband • DUAL PURPOSE • TES3 – with software modules can bridge between signals and also between standards • TES7 – bridges SMPTE334 data on SMPTE292 baseband signal to emission compression system

  12. ADB7 HD BRIDGE • Bridges SMPTE334 data from/to SMPTE 292/259/292 baseband video signals • Used with two part HD storage devices • Bridges around the compression engine

  13. VDB7 DTV BRIDGE • Upconverts 6O8 to 708 captions • One video service per module • Up to four modules (services) per chassis. Module types may be mixed • 16 chassis can be daisy chained • Software loadable - other modules such as Nielsen reader available CHASSIS MODULE

  14. CONCLUSIONS • The TES7 provides embedded 608, derived 708, and native 708 encoding in the vertical ancillary space of the HD baseband signal. Therefore DTV encoding requirements are met. • The ADB7 provides the capability to store VANC caption data on tape drives and video servers available from several manufacturers. Caption content can continue to be delivered in the way it now is. • The TES7 will pull caption data from the SMPTE292M VANC and provide it to the ATSC program encoder (DTVCC) and PSIP server, bridging between baseband and emission standards, until such time as emission equipment reads SMPTE334 data. • CONCLUSION: the entire end-to-end system is in place. It would be advantageous to standardize on caption file formats and interfaces. It is suggested that this should be ‘the next step’.

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