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DT V Closed Caption Data Server Versatile Platform for Encoding EIA-708 Closed Captions and Related Data

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DT V Closed Caption Data Server Versatile Platform for Encoding EIA-708 Closed Captions and Related Data DT V 708 DT V Closed Caption Data Server Versatile platform for encoding EIA-708 closed captions and related data Encode closed caption files directly from floppy disk Video, Time Code, Simple on-screen Data Status LED’s user interface DTV 708 Features DTV Closed Captioning n Transcodes EIA-608 NTSC Digital television introduces a new standard for closed captioning. The standard, known as captions to EIA-708 DTV EIA-708, provides 9600 bps for caption data compared to 960 bps for NTSC. This tenfold captions increase in bandwidth allows more caption data channels and enhanced display attributes. Plus, DTV closed captioning offers a caption service directory. n Strips caption data from SDI component inputs or In NTSC captioning, two bytes of data are encoded in line 21 of the video signal. In DTV analog composite inputs captioning, data is encoded within the “picture user_data” portion of the video stream. The caption service directory is carried in both the Program Map Table (PMT) and Event n Reads caption files directly Information Table (EIT) of the DTV bit stream. DTV captioning provides a backwards from floppy drive or local compatibility mode where two EIA-608 caption bytes representing NTSC field 1 and two area network bytes representing field two are sent per picture. n Built-in closed caption It is the job of the DTV encoder to embed the DTVCC data into the picture data. Likewise, decoder, LTC time code it’s the job of the DTV transport multiplexer to embed the caption service directory into the reader, bidirectional GPI PMT and EIT. The ULTECH DTV Closed Caption Data Server provides this data to the encoder and multiplexer with the requisite timing, protocol, and packetization. n Easy to use on-screen menus How DTV 708 works n Field upgradable hardware As DTV ramps up, a large portion of programming will be upconverted from NTSC. The and software originating material will likely contain NTSC closed captions which may be transcoded to EIA- n 708 DTVCC captions. The DTV708 has an upstream caption decoder which recovers data from Options: modem, network D1 or composite video sources. The recovered data bytes from line 21 are sent as NTSC interface backwards compatible data, and they are also transcoded to EIA-708 format and sent as DTVCC data. Transcoding is a complex process that involves decoding the NTSC/PAL caption to determine service, placement, attributes, and timing. The desired effect on screen is emulated DTV 708 is ideal for: with EIA-708 commands. Transcoding must be performed quickly in order to preserve caption n Broadcasters timing, so a dedicated Pentium processor is used. n NTSC–to–DTV DTV708 may also receive caption data via modem, RS-232 serial port, network, or USB port in upconversion real time. DTV708 can also encode DTV or NTSC caption data directly from its hard drive. Caption data is transferred to the hard drive by way of the floppy disk, network connection, or n MPEG encoding sites modem. This process is known as off-line encoding and it uses LTC time code to regulate the flow of caption data to the DTV encoder. Evolving Standards Methods for providing DTV closed captioning together with the caption service directory are still evolving. Consequently, DTV708 software may need to be updated occasionally. DTV708’s with the modem option are updated automatically by ULTECH. Units without a modem may be updated from the floppy drive. Applications DTV Video Real-time captioning from D1 digital video source. Upconverter D1 DTV708 strips EIA-608 caption data from an SDI video source. Component The bytes are sent to the DTV encoder as NTSC backwards Digital Video DTV compatible data. The upstream bytes are also decoded, turned DTV 708 Encoder / into EIA-708 captions, and sent as DTVCC data. Closed Caption Data Transport Data Server Multiplexer The Caption Channel Service Directory may reside on the Digital DTV708 hard drive and be sent to the DTV encoder concur- Video In Serial Composite Digital Video rently with DTVCC data. The service directory is sent based on Interface Interface LTC time code set to the broadcaster’s time of day. Analog Analog Monitor Video Out Video In Video Out Composite Decoded Captions / Video On-screen Menus Monitor DTV Video Upconverter Real-time captioning from composite video source. Analog Composite DTV708 strips the “lagacy” caption data from incoming Video, DTV NTSC or PAL analog composite video. The bytes are sent to the DTV DTV 708 Encoder / encoder as NTSC backwards compatible data. The Closed Caption Data Transport Data Server Multiplexer upstream bytes are also decoded, turned into EIA-708 captions, and sent as DTVCC data. Serial Composite Digital Video The Caption Channel Service Directory may reside on Interface Interface the DTV708 hard drive and be sent to the DTV encoder Analog Monitor concurrently with DTVCC data. The service directory is Video In Video Out sent based on LTC time code set to the broadcaster’s time of day. Composite Decoded Captions / Video On-screen Menus Monitor HDTV Live or off-line closed captioning. HDTV Video In this application, DTV708 truly acts as a caption server because the caption data file is encoded from HDTV DTV DTV708’s hard drive. The file to be encoded is VTR / LTC Time code DTV 708 Encoder / Video Closed Caption Data Transport transferred via the floppy drive, modem, or network Server Data Server Multiplexer connection. Caption data is metered to the DTV encoder / multiplexer based on longitudinal time Serial Composite Digital Video code. With HDTV sources, the video circuitry within Interface Interface DTV708 is used only to provide on-screen menus on Monitor a composite analog monitor. Alternatively, on-screen Video Out menus may be displayed on a VGA monitor. Composite Video On-screen Menus Monitor Modular Architecture DTV708 is constructed in modular fashion. All of the major components plug into industry standard slots. The modular architecture allows for easy upgrades. There are slots available for new functions that may be required as DTV operating procedures evolve. DTV708 applications software is also written in modular form to facilitate customization. One possibility is to recover upstream IP Multicast data encoded in the form of NABTS teletext, and forward it to a DTV transport multiplexer as user data. Note that DTV708’s upstream data decoder makes this possible as it can handle nearly any VBI data waveform—not just line 21 caption waveforms. Digital BNC Video Composite In Cable Digital Video Video Out Equalizer/ -to- Deserializer Analog BNC Converter S-Video Out Mini-DIN GPI In/out #1 GPI Front Panel Interface Keys/LED’s Serial Digital GPI In/out #2 Interface Card Composite Program Video In Video Out I VBI Encoder S BNC A Monitor / OSD B Time Closed On-Screen Video Out A Code Caption Display C In Upstream Data Decoder Generator K LTC Decoder BNC Decoder P Mini-DIN L Data Stripper / Encoder / Monitor Card A N E Com Port 1 Floppy Drive Com Port 2 Hard Drive Pentium Processor USB VGA Monitor (not required) CPU Plug-in Card Optional Optional To To Plug-in Card Ethernet ISA Modem ISA Plug-in Back- Plug-in Back- For Future Card plane Card plane Requirements DTV Encoder / Multiplexer Interface Some encoders provide RS-232 ports for receiving DTVCC data. Some encoders receive PMT / EIT data through the same port, others require a serial port together with an ethernet connection. ULTECH DTV708 provides support for both interfaces as well as a USB Universal Serial Bus. ULTECH supports an industry defacto standard for interfacing to DTV encoders. Please contact ULTECH to receive a copy of this protocol. DTV708 is a highly configurable Pentium-based computer and may be programmed to supply data beyond DTV closed captioning, such as PSIP or transcoded teletext data. DTV708 may be programmed to support proprietary protocols. Keyboard Com Mouse VGA Out Y/C Analog Digital (Not Required) Port 1 (Not Required) (Not Required) GPI In/Out Out Video Out Video In CPU Serial Interface Digital Interface 1 GND 2 AC Out Monitor Program Analog LTC In Video Out Video Out Video In 120 VAC 240 VAC Network Analog Interface Interface AC In USB USB Com #1 #2 Port 2 Line Phone Modem optional DTV708 is housed in a 3½” high steel chassis and is constructed with high reliability components. DTV 708 Hookup CPU Connection Keyboard: PS-2 style keyboard connector. You do not need to connect a keyboard for normal operation. You only need a keyboard for performing system upgrades or maintenance. Com Port1: RS-232 serial interface connector. Mouse: PS-2 style mouse connector. You do not need to connect a mouse for normal operation. You may optionally connect a mouse when performing system upgrades or maintenance. VGA: You do not need a VGA monitor for normal operation. All on-screen menus and status screens appear at the VGA output. You need a VGA monitor when performing upgrades and maintenance. Network Interface: RJ-45 modular jack for unshielded twisted pair network cabling. BNC connector for thin coaxial network cabling. Serial Digital Interface Digital Video In: This input expects a standard SMPTE-259M component digital or composite digital signal, in either 525 or 625 standard. The input is internally terminated by 75 ohms. Provides analog composite video to analog interface. Analog Video Out: Feeds composite video to analog Data Stripper/Encoder/Monitor card. Y/C Out: Provides an analog Y/C output which may be used to drive an S-Video monitor. GPI In/Out: This is a dual bidirectional GPI port. You can receive GPI triggers from external equipment, or you can program the DV708 to generate GPI triggers and events.
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