The control Closed captions OFF/VBI Lines will control the insertion of closed
captions in both user data and VBI PID (if the VBI component is added)
The Closed captions can also be carried in a Separate VBI PID. This is only carried
from SDI input (VBI component). The user has to create a separate component.
8.5.8.4 No VITC Control of Timecode
TC mode on the VBI page controls the timecode mode on the Video PES and does
not control the output on a separate VBI PID (VBI on PES), The only control for VBI
on PES is the presence of the VBI component and the selection of the appropriate
VBI line as VITC.
8.5.8.5 Video Index Operation and Active Format Description (AFD) Problems
For Video Index operation a difference may be observed in AFD operation between
VBI PES and AFD in the SEI. For pass-thru of the Video Index line in PES, both the
1995 (3 bit AFD code) and 2008 (4-bit AFD code) versions are supported, i.e. the
relevant 4 data bits are passed through unmodified and can be interpreted as either
specification. For extraction of AFD code information from Video Index to SEI
message/Video User Data, the assumption is made that the 1995 specification is in
use in the encoder/decoder chain. (3-bit AFD code only).
8.5.8.6 Number of VBI Lines Supported
The current version of AVP 4000 supports up to 7 lines of VBI on the top field and 7
lines of VBI on the bottom field.
If more lines are selected, unwanted VBI operation may occur (see list of defects)
8.5.8.7 Line Numbering for VBI Lines
The AVP 4000 lists VBI lines ranges in NTSC:
NTSC: Field 1 Line 9 to 22 Field 2 Line 272 to 285
PAL: Field 1 Line 6 to 23 Field 2 Line 319 to 335
Ericsson receivers describe the VBI line numbering as followed:
NTSC: Field 1 Line 10 to 22 Field 2 Line 10 to 22
PAL: Field 1 Line 6 to 23 Field 2 Line 6 to 23
8.5.8.8 ANC Output Dropped
The Generic ANC Extraction off/on is the switch for ANC Data component activity,
regardless of the individual components settings that are carried over ANC
(Closed captions, SMPTE2031, OP47, etc.).
To Next Page
Loading...
