GUIDE TO INSTALLATION AND OPERATION
44
| XVP-3901
5.5.4.2 Meta / Meta sub-tab
Closed Caption
section
Presence:
this icon turns green in the presence of incoming
EIA-708-B or EIA-608-B closed captioning data when an
3G/HD source is installed or when line 21 closed captions are
detected when an SD source is installed.
Insertion:
The pull-down is used to select between
Auto
or
OFF
. Availability of these controls is affected by whether or
not Line 21 of the input SD or output SD signal has been
configured as blanking; see
SD Input/Output Config
subsection below for details.
When
Auto
is selected, closed captioning information is
processed as follows:
3G/HD to SD Downconversion:
As described in EIA-708-B, closed captioning within a 3G/HD
signal is embedded in the form of ANC packets. The XVP-
3901 extracts all NTSC legacy (compliance) closed captions
from within incoming EIA-708-B DTV closed captions, buffers, and re-inserts the data within line 21 of the output SD
signals as per EIA-608-B standard. Processing is restricted to NTSC CC information (Service 0) only.
The XVP-3901 also supports incoming EIA-608-B CC packets conforming to SMPTE 334M. However, EIA-708-B
packets have priority. If both are embedded in the source, the EIA-708-B packets are decoded, as explained above,
and the EIA-608-B packets are discarded. If no EIA-708-B packets are detected, EIA-608-B packets are automatically
extracted if detected.
Closed captions insertion is disabled for 50Hz and 1080p23/1080p23/1080p25/1080p29 sources.
SD to SD operation:
In order to allow the XVP-3901 to properly handle incoming closed captions on line 21, make sure to set
SD
Input/Output Config
to
Blanking
and make sure to set
Insertion
to
Auto
.
SD Input/Output Config
section
Line 21:
Specifies if line 21 (or line 23 in PAL) shall be considered as blanking or active video; this selection affects
Close Caption
availability, controlled in the
Close Caption
sub-section of this tab (see above). Depending on the
settings and input/output selected, it also affects the output video, as shown in this table:
For SD Output:
Input Format Line 21 Status
CC Insertion Effect on SD Output
3G/HD 60 Hz Blanking
Off
Line 21 blanked, first active line is 22, image slightly downscaled
Auto
CC run-in on line 21, first active line is 22, image slightly downscaled.
Active
N/A
Line 21 has active video and may be resized.
SD 60 Hz
Blanking
Off
Line 21 blanked.
Auto
Input line 21 copied to output.
Active
N/A
Line 21 has active video and may be resized.
3G/HD 50 Hz Blanking
N/A
Line 23 blanked, first active line is 24.
Active
N/A
Line 23 has video and may be resized.
SD 50 Hz
Blanking
N/A
Line 23 blanked, first active line is 24.
Active
N/A
Line 23 has active video and may be resized.
The
Line 21
pulldown also appears in the HD Video Output Panel, and the two follow each other; change the selection
in one and the other is also changed.
Figure 5.28
Video Outputs SD - Meta/Meta tab
