Closed Captions; Sd Captions; Hd Captions - pro bel V6402 HD User Manual

V6402, V6404, V6406, V6408
and V6418 HD converters
3.7

Closed Captions

The V6404/06/08/18 provide some functionality for dealing with closed caption data. These functions are
summed up in a group call 'CCAPTION'.
The main task is to 'transcode' or transfer the closed caption information between the different domains,
i.e. from SD to HD or vice versa, whilst preserving its original digital content.
The data is read from the input before video processing, then inserted afterwards.
Support is provided for CEA-608 and CEA-708 type captions using SMPTE-334M to carry the data in HD
video formats.
Data can be transcoded or transferred in the following configurations:
Input
SD – CEA-608 : line 21
SD – CEA-608 : line 21
HD – CEA-708 : SMPTE 334M
HD – CEA-708 : (608 data) SMPTE 334M
3.7.1

SD Captions

Caption data is defined in CEA-608 is transported as an analogue waveform (typically on line 21) on the
active picture of an SD frame. Data can be read from and inserted onto the SD video in the CEA-608 line
21 format.
In 525 Line 21 data can be present on line 21 to 25 and/or 284 to 289.
In 625 Line 21 data can be present on line 22 to 26 and/or 335 to 339.
Data is always inserted on line 21 and/or 284 of the 525 frame, and 22 and/or 335 of the 625 frame.
3.7.2

HD Captions

Caption data is carried in SMPTE 334M packets in the HD video standards. Packets will be read from any
area in the VANC period of the input. In the output the SMPTE 334M packets can be inserted on a
selected line which defaults to line 9 in all standards.
There are two controls for the line selection:
ANC1080i : sets the insertion line for the 1080i standard from line 1 to line 20.
ANC 720p : sets the insertion line for the 720p standard from line 1 to line 25.
HU-V6402&4&6&8&18
V6404CP
Output
SD – CEA-608 : line 21
HD – CEA-708 : (608 data) SMPTE 334M
HD – CEA-708 : SMPTE 334M
SD – CEA-608 : line 21
V6408CP
V6406CP
V6418CP
49