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DTV CAPTION SUMMIT14 MARCH 01SESSION ON NEXT STEPSnorpak corporation: 

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

CAPTION DELIVERY ARCHITECTURE: 

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

TES7 CAPTIONING FORMATS: 

TES7 CAPTIONING FORMATS Encoding Bridging to MPEG Decoding descriptors

DATA DELIVERY (CAPTION CREATION): 

DATA DELIVERY (CAPTION CREATION) CONTRIBUTION DISTRIBUTION Broadcast CAPTION CREATION

DATA DELIVERY (NETWORK): 

DATA DELIVERY (NETWORK) CONTRIBUTION DISTRIBUTION Broadcast MPEG DECODE & DEMUX 292M 292M 292M 292M 292M 292M Contri- bution Distri- bution

DATA DELIVERY (STATION): 

DATA DELIVERY (STATION) CONTRIBUTION DISTRIBUTION Broadcast MPEG DECODE & DEMUX 292M 292M 292M 292M 292M 292M Distri- bution Broadcast

TES7: 

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

TES7 STANDARDS: 

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

ANCILLARY DATA FORMAT: 

ACTIVE PICTURE DATA HANC ANCILLARY DATA FORMAT VANC LUMINANCE : 1920 OR 1280 BYTES CHROMINANCE : 1920 OR 1280 BYTES 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

VANC THROUGHPUT: 

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

BRIDGES: 

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

ADB7 HD BRIDGE: 

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

VDB7 DTV BRIDGE: 

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

CONCLUSIONS: 

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’.