FS2 Frame Synchronizer/Converter v3.0 73 www.aja.com
18 Caption Xlator
On (Upconverter)
On (Downconverter)
Off (default)
When set to On and using the Upconverter, the FS2 will automatically
translate incoming line 21 captions to CEA-708 format and insert
the VANC packets into the converted HD video stream. This is a
complete translation from CEA-608 format to CEA-708 format
(including the embedded SD captions).
When set to On and using the Downconverters, the FS2 will
automatically intercept and reformat the SD caption data in the
incoming CEA-708 VANC packets, and output it on line 21 of the
standard definition outputs.
When Off, caption translation is not performed.
In standard definition video (525i59.94), closed captioning data is encoded and
sent on line 21 of both fields, using a format defined by the Consumer Electronics
Association standard, CEA-608. This is traditionally called “line 21”, “SD”, or “608”
captioning, and is used for analog composite, analog component, and serial
digital (SDI) video.
In high definition video, closed captioning is encoded and sent as Vertical
Ancillary (VANC) packets in SDI video, using a format defined by the Consumer
Electronics Association standard CEA-708 (there is no equivalent for analog
HD video). This is traditionally called “HD,” “DTV,” or “708” captioning. The
data formatting and encoding for 708 captions is very different from the data
contained in 608 (SD) captioning, reflecting the added features and capabilities
available with the CEA-708 standard.
When the Caption Translator is on, the FS2 Upconverter automatically translates
incoming line 21 captions to CEA-708 format and inserts the VANC packets into
the converted HD video stream. This is a complete translation from CEA-608
format to CEA-708 format (including the embedded SD captions).
The FS2 Downconverters automatically intercept and reformat the SD caption
data in the incoming CEA-708 VANC packets, and output it on line 21 of the
standard definition outputs.
Input Scan and PsF
This parameter determines how the Deinterlacer handles interlaced vs. PsF
inputs. Normally, this control will only be used to indicate that a 1080PsF25 input
is PsF and not interlaced.
Auto
When Auto is selected, the system will look for clues in the source’s SMPTE 352
(Payload ID) data and respond accordingly. If there is no SMPTE 352 information,
the system will assume that 23.98/24 fps sources are PsF, and 25/29.97/30 fps
sources are interlaced.
Progressive
When Progressive is selected, the system will assume that all sources are PsF
(even if there is SMPTE 352 data to the contrary).
Interlaced
When Interlaced is selected, the system will assume that all sources are interlaced
(even if there is SMPTE 352 data to the contrary)