Grass Valley 8990ARC v.3.0 - Manual (Page 21)

8990ARC Instruction Manual 21
Configuration
Modified Video Index Coding
In the Modified Video Index Coding (a revision of SMPTE RP-186 based on
the ARDSPCI rev 1), the definition of the first byte (octet) of the Video Index
data has been modified to hold additional information. The three least sig-
nificant bits of this byte have not changed; they still contain the aspect ratio
information of the video. Refer to
Table 5 for the definition of the first byte
and how it is interpreted by the module. Note that the line rate is ignored
by the module.
The next three bits of the first octet of the Video Index (b3, b4, and b5)
contain the intended aspect ratio of the active region of the video (ARD).
Table 6 shows how this data is defined as well as the resulting module
operating mode for all combinations of selected output status and AID
status from
Table 5 .
Note The operating mode portion is only valid if Video Index control is enabled and
there are not any valid, higher priority controls enabled.
Table 5. Modified Video Index Coding – AID
AID Value Definition Resulting AID Status
000 No information Invalid
001 525/59.94 4:3 4:3
010 625/50 4:3 4:3
011 Reserved Invalid
100 Reserved Invalid
101 525/59.94 16:9 16:9
110 625/50 16:9 16:9
111 Reserved Invalid
Table 6. Modified Video Index Coding – ARD
ARD Value
(b5, b4, b3)
Definition
Selected Output
Format
AID Status Resulting Module Mode
000 Active region same as coded frame
4x3
Invalid Default to next highest priority control
4:3 Mode 1: Bypass
16:9 Mode 2: Letterbox
16x9
Invalid Default to next highest priority control
4:3 Mode 2: Pillarbox
16:9 Mode 1: Bypass
001 4:3
4x3
Invalid Default to next highest priority control
4:3 Mode 1: Bypass
16:9 Mode 3: Full Height
16x9
Invalid Default to next highest priority control
4:3 Mode 2: Pillarbox
16:9 Mode 1: Bypass