
Crystal Vision
Output AFD and WSS
6 Output AFD and WSS
There are three sets of controls associated with Active Format Descriptor (AFD).
These are the inserter mode control, entire image aspect ratio selector (coded frame)
and the group of 16 AFD codes.
The ANC data packets containing the AFD information are inserted within the active
line portion of the fourth line after the switching line in the vertical ancillary space line.
The 16 available codes are described in the following table
AFD code
Description
AFD code
Description
0
Undefined
8
Full Frame (as coded frame)
1
Reserved
9
4:3 Centre
2
16:9 Centre
10
16:9 Centre
3
14:9 Centre
11
16:9 Centre
4
16:9+
12
Reserved
5
Reserved
13
4:3 with shoot and protect
14:9 centre
6
Reserved
14
16:9 with shoot and protect
14:9 centre
7
Reserved
15
16:9 with shoot and protect
4:3 centre
Note:
When inserting SMPTE 2016 data the inserter will blank
any incoming SMPTE 2016 data.
6.1 Widescreen Signalling
Output widescreen signalling can be set to automatically follow the input AFD data or
be manually selected. If WSS data should be present on the input video this can
either be passed to the output unchanged or substituted for a user selected code.
WSS data can also be set to be blanked.
Outgoing WWS codes
Explanation
Conversion
0001
full format 4:3
Centre cut
1000
box 14:9 centre
Letterbox
1101
box 16:9 centre
Letterbox
1110
full format 16:9
Anamorphic
Q-Down-AG 3G/ATG 3G User Manual R2.1
17
11 July 2019