Crystal Vision
Timecode and Closed Caption
7 Timecode and Closed Caption
The
Q-Down-ATG 3G
can deal with both (ATC) ancillary data timecode (SMPTE
12M) and (D-VITC) vertical interval timecode (SMPTE 266M). ATC is particularly
useful when down converting progressive High Definition video to an interlaced High
Definition output. When outputting Standard Definition
Q-Down-ATG 3G
will also
convert the ancillary timecode to vertical interval timecode. VITC code is always
repeated on two adjacent video lines, one in each field. The line pairs used are also
selectable to allow extra data to be encoded. If the ATC output is disabled, the
AFD/ATC line number will still select the line number, on which AFD will appear for
down-converted SD outputs. When using the
Q-Down-ATG 3G
to convert 1080p to
1080i output, the ATC and AFD are inserted in lines 9+571 and 11+547 respectively.
DTVCC, digital television closed caption (CEA-708), is down converted by
Q-Down-
ATG 3G
to 525i closed caption (CEA-608) which would normally be inserted on to
line 21.
Q-Down-ATG 3G
allows this closed caption information to be inserted on to
any of line 12 to line 21. This includes extended data service (XDS).
When not down converting. all TC and CC control will be inactive.
525 VITC lines
10+12 (273+275)
13+15 (276+278)
16+18 (279+281)
11+13 (274+276)
14+16 (277+279)
17+19 (280+282)
12+14 (275+277)
15+17 (278+280)
18+20 (281+283)
625 VITC lines
6+8 (319+321)
11+13 (326+328)
16+18 (329+331)
7+9 (320+322)
12+14 (325+328)
17+19 (330+332)
8+10 (321+323)
13+15 (326+328)
18+20 (331+333)
9+11 (322+324)
14+16 (327+329)
19+21 (332+334)
10+12 (323+325)
15+17 (328+330)
20+22 (333+335)
VITC paired line numbers for both fields for 525 and 625 systems
Q-Down-AG 3G/ATG 3G User Manual R2.1
18
11 July 2019
