Closed Captioning - Cobalt Digital Inc 9902-UDX-DSP Product Manual

Operating Instructions
Table 3-2 9902-UDX-DSP Function Menu List — continued
• Closed Captioning Input Status
• Closed Captioning Remove/Regenerate
and HD Insertion Line Controls
• Presence/Absence Check Controls
9902-UDX-DSP-OM (V1.5)
9902-UDX-DSP Function Menu List and Descriptions
Provides support for closed captioning setup. Also
provides controls for setting closed captioning absence
and presence detection thresholds.

Closed Captioning

Displays incoming Closed Captioning status as follows:
• If closed captioning is present, a message similar to the example shown
is displayed.
• If no closed captioning is present in the video signal, Not Present or
Disabled is displayed.
Note: • Packet closed captioning status Captioning Rejected Due To
message can appear due to the items described below. The
closed captioning function assesses cdp_identifier,
cdp_frame_rate, ccdata_present, and caption_service_active
items contained in the packet header to make the determinations
listed below. Refer to CEA-708-B for more information.
Message
Unsupported
Frame Rate
Data Not
Present
No Data ID
• caption service is marked as inactive display indicates bit in
packet from upstream source may inadvertently be set as
inactive. In this case, closed captioning data (if present) is still
processed and passed by the card as normal.
• The closed captioning function does not support PAL closed
captioning standards.
Allows removal of closed captioning packets and regeneration of packets.
This is useful where closed captioning must be moved to a different line
than that received on.
Note: • Although the output line drop-down will allow any choice within
the 9 thru 41 range, the actual range is automatically clamped
(limited to) certain ranges to prevent inadvertent conflict with
active picture area depending on video format. See Ancillary
Data Line Number Locations and Ranges (p. 3-9) for more
information.
• The card does not check for conflicts on a given line number.
Make certain selected line is available and carrying no other
data.
Displays CC presence and/or absence event status. This status can be
propagated to the Event Setup tab controls to issue a card GPO or other
command when CC presence/absence events are detected.
Controls for both presence and absence provide for a holdoff time (in
seconds) where, when time is exceeded, an event is to be considered a
valid alert event.
9902-UDX-DSP PRODUCT MANUAL
Description
Film rate closed-captioning (either as
pass-through or up/down conversion) is not
supported by the card.
Packet is marked from closed captioning
source external to the card that no data is
present.
Packet from closed captioning source
external to the card is not properly identified
with 0x9669 as the first word of the header
(unidentified packet).
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