Imagine Selenio X50, Installation And Operation Manual, Page: 55 / 136

X50
Installation and Operation Manual
41
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The menu option Video > Scalar x > Advanced > AFD Crop Enable must be set to
Off . If you set the parameter to On , AFD alignment will not occur.
When all three conditions are met and the video input format is interlaced, the output AFD/
VI/WSS code and new aspect ratio will be aligned with the video content. If the video input
format is progressive, the output AFD/VI/WSS code and new aspect ratio will lag the video
content by one frame.
AFD/VI/WSS alignment is delayed when there is a disturbance of the input video, or the
input video selection is changed. However, the alignment will continue to operate normally
if the input video is undisturbed and the AFD/VI/WSS code changes no more than once per
second.
Closed Captioning and DVB Teletext Captioning
Although North America has dedicated standards for closed captioning of video (EIA-608
and 708), many countries in Europe and elsewhere have not yet adopted formal standards.
For these countries, closed captioning is part of the DVB Teletext System as described in
ITU-R BT-653-3. These specifications define all Teletext Systems (Systems A, B, C, D) used in
the world and are also known as the World System Teletext (WST). A Teletext system is
made of several pages of various data information and CC data is described in one these
pages. System B is used in Australia, the UK, and Germany, among other countries.
Australian closed captions are inserted on line 21/334 in analog PAL broadcast signals, as
per the ITU-R BT-653-3. When analog PAL is produced or converted to SDTV (625 digital), a
digitized version of the closed captioning appears on line 21/334 (in the same way line 21
on NTSC signals is digitized and appears on the line 21 of SD-SDI signals). The document
proposed by Free TV Australia indicates how to carry this CC data into the VANC area of
SD-and HD-SDI signals by use of the SMPTE 334M VANC embedding protocol. For digital
broadcasting, Australia intends to use the ETSI EN 300 472 standard that specifies the
conveyance of ITU-R System B Teletext in DVB bit streams.
Closed Captioning and Teletext data that is embedded in the input stream is detected by
the
CC/TT Present parameter. This information is re-embedded into output video stream
when you set the CC/TT Embed parameter to On . Closed captioning and Teletext are not
supported when the frame rate converter is in use.
Generic Data Passing
VANC data are removed when video is converted through the scalar of the X50. The
Generic VANC data passing function makes it possible to select one kind of VANC data
(identified by its DID/SDID) and pass it from input to output. This requires the configuration
of the following parameters:
Video > Data > Input > Data DID (hex) and Data SDID
(hex) . Field information for the VANC data is also required for the system to understand the
nature of the VANC data and pass it properly. The X50 can pass up to 10 packets of the
same generic data per frame.
To pass a data type that is one packet per frame/field, set Video > Data > SDI x Output >
Data Pass to Pass One Packet, and then configure Data Embed Field and Data Embed
Line properly to let the system know the nature of the data you want to pass.