OPERATORS MANUAL
TT1200 MPEG2-DVB PROFESSIONAL DECODER
PAGE 34
TANDBERG TELEVISION ASA, Philip Pedersensvei 20, PO Box 322, N-1324 Lysaker, Norway
Tel: +47 67 11 62 00, Fax: +47 67 11 62 01
VBI Priority:
In some cases, there may be a conflict when different VBI-data are assigned to the same VBI line. This
may be the case in lines 12, 14, 16, 17, 18, 19 and 20. Priorities to the different VBI data are assigned
according to the table below (with priority 1 as the highest). The table applies for both fields, except for
VPS, which is only present in the first (the VBI line number in the second field is given by adding 313
to the VBI line in the first field).
Line
Priority
VBI data
12
14
16
17
18
19
20
VPS
(x)
1
VITS
(x)
(x)
x
x
2
Teletext
x
x
x
x
x
x
x
Legend:
(x)
The default placing of the VPS- and VITS-data.
x
Alternative or supplemental placing of the different VBI-data
For example, it can be seen from the table that both VPS and VITS (test lines) can override both
teletext in lines 16 to 20. The decoder vill attempt to insert suppressed teletext lines if there are
available lines in the VBI, if not the teletext lines will be discarded.
The parameters for 625 lines and 525 lines video, respectively, are as follows:
625 ln video format (PAL and SECAM)
7HOHWH[W
Enable or disable teletext. This menu entry is the same as in the
Setup
menu, but
is repeated in this menu, to get a complete overview of the video setup
parameters.
6XEWLWOLQJ
Enable or disable subtitling. TT1200 supports DVB subtitling and teletext
subtitling (see section 2.3.2.4 for a closer description). For DVB subtitling select
DVB
and for teletext subtitling select
TTX.sub
. To disable subtitling select
Off
.
This menu entry is the same as in the
Setup
menu, but is repeated in this menu, to
get a complete overview of the video setup parameters.
:66
Enable or disable Wide Screen Signalling {Off; MPEG-video; On (DVB)}. The
different settings may be interpreted as follows:
Off
: WSS is disabled, and the first half of line 23 will be blanked (i.e. set to black
level)
MPEG-video
: Line 23 will be treated as MPEG video. This is useful in cases
where WSS is encoded as video.
On (DVB)
: If present in the transport stream (DRAFT prETS 300 294), WSS-
data will be inserted in the first half of line 23.
If the signalled aspect ratio differs from the actual aspect ratio, the WSS signalling
is changed to reflect the actual aspect ratio of the video output.
In the special case where no WSS data stream is present and the MPEG-video
aspect is 16:9, the decoder will locally insert code for “16:9-full format
(anamorphic)”. Except for the four bits describing the aspect ratio, all other bits in
the WSS will be set to zero.
If no WSS data stream is present, and the MPEG-video aspect is 4:3, half of line
23 will be set to black level.
936
Enable/Disable use of Video Programming System feature {Off, On}.
7HVWOLQHV
Inserted test lines on lines: 17,18 or 19,20 or none {17/18, 19/20, Off}
([WUDOLQH
Select between sin(x)/x or Sweep on line 335. {sin(x)/x, Sweep, Off}.
&XWVLGHV
Converts 16/9 video format to 4/3 video format. {on, off}. The conversion from
16:9 video format to 4:3 is done by “cutting” off the left and right part of the
picture, to make it fit on a 4:3 screen.
