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CPP100
SECTION 6
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
6.30
On Fail: SDI B
When an input loss is detected this option
displays a frozen image of the signal on
SDI B. This option could be used to display
a station logo or other static message. If
SDI B is selected as the source this option
performs an On Fail Freeze.
On Fail: Freeze
When an input loss is detected the picture
is frozen.
On Fail: Video (Comp inputs only and not
on –G version)
When an input loss is detected the ‘failed’
source is fed to the ouput.
On Fail: Message
When an input loss is detected, a black test
pattern is generated. This is sent to the
PROGRAM output. A message is displayed
on the MONITOR output as shown below.
On Fail: Test Pattern
Any of the available test patterns can be
selected should an input loss occur.
When PREFIX detects that the input has recovered
the On-Fail condition reverts back to the selected
video source.
Vertical Interval Test Signal Processing
( VITS )
PREFIX provides for comprehensive VITS
processing. The following options are available:-
All On
Pass all VITS lines
All Off
Blank All VITS lines
User Cfg
Selectively Blank
VITS lines
Default
All On
When the
User Cfg
option is chosen the VITS lines
to be blanked are picked in the
Select
sub-menu.
The appropriate VITS lines for 525 line and 625 line
standards are displayed. Individual lines can then
be selected. For example if only line 10 is to be
blanked the simplest method is to select the
All On
mode and then select line 10 in the
Select
sub-
menu.
If the source is composite then a further option is
available
(not on –G version)
The VITS lines may
be processed as decoded or composite.
Decoded
Pass as decoded luma
Composite
Pass sampled composite
as luma, chroma blanked
Default
Composite
8 Bit Rounding
A facility exists to round the processed video to 8
bits. This is only done at the ouput stage of the
PREFIX, so signal processing is maintained at 10
bits or higher until the output stage. Use of this
facility may be preferable as some systems truncate
the video to 8 bits. Rounding to 8 bits upstream of
such systems may improve the quality of the
picture. The default status is 8 bit rounding OFF.
Net Name
Input Loss