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1
What are "native 608" closed captions?
CEA-608 ("native 608") closed captions are captions formatted and presented in the
current analog television system and carried on the two fields of line 21 of the vertical
blanking interval. Field one contains CC1, CC2, T1, and T2 (the latter being text services).
Field 2 contains CC3, CC4, T3, and T4. CC1 is most often used to carry verbatim English
captions and CC3 is increasingly being used for Spanish-language captions and captions
edited for young children ("Easy Reader" or "Beginning Reader" captions). The common
look and feel of native 608 captions is limited to white block letters within a box-like black
background field. Colour (non-white) characters, while possible, are only occasionally
used due to the 13-year legacy of set-top decoders, which cannot display coloured
captions.
1
What are "native 708" closed captions?
CEA-708B is the standard for conveying caption data in a digital television signal.
Because the DTV signal does not have a vertical blanking interval, CEA-708B specifies
that the captioning data shall be carried in the video user bits of the MPEG-2 bitstream.
CEA-708B captions have greatly enhanced formatting and display capabilities compared
to NTSC 608 captions. Strictly speaking, native 708 captions are those authored and
encoded for CEA-708B use. It is also possible to encode native 708 format captioning
from authoring information intended for 608 captioning, although such captions will have
the same limitations as translated captions.
3.5.
GENERAL
This tab is for information only; it displays the type of card that is installed in the chassis. The card also
has the ability to monitor the power supplies of the frame in which it resides in. Simply check the
Frame Status Error box to enable SNMP traps. The Frame Trap Status LED is an indicator that will
turn red when one or both of the frame's power supplies fail.
7880DEC-MP2HD-2 Dual HD MPEG-2 Decoder
Figure 3-6 VistaLINK
®
Revision 1.0
7800 MultiFrame Manual
PRO - General
7880DEC-MP2HD-2 - 17
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