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Specifications

ManualsBrandsVideotek ManualsComputer equipmentVTM-2000
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Alarm Descriptions
VTM Series Installation and Operation Handbook
5-6
Picture Shift
The Picture Shift alarm activates when the luma portion of the video does not exceed
the amplitude threshold along any of the four borders of active video. The “Left/Right”
and “Top/Bottom” border settings define the tolerance of the Picture Shift alarm. If one
or more pixels are above the threshold for each of the four tolerance borders, no alarm
will be declared. For interlaced video formats Picture Shift checks the first field only.
For example, if a signal is 525/59.94 SDI video format, where “Left/Right” is set to 20
pixels, “Top/Bottom” is set to 4 lines, the threshold is set to 2 mV, and the “Duration”
is set to 2 seconds, the alarm will be activated if pixels 1 through 20 or 701 through
720, or lines 1 through 4, or 240 through 244 of active video do not exceed the 2 mV
threshold and exceeds the duration of 2 seconds.
Captioning
CC Not Detected – 608
The Closed Caption Not Detected 608 alarm is activated when the presence of
EIA/CEA-608-B closed caption data on line 21(284) with valid parity bits is not
detected for a period in excess of the duration setting.
CC Not Updating- 608
The Closed Caption Not Updating 608 alarm is activated when closed caption carrier is
present and the EIA/CEA-608-B data word on line 21 is null for a period in excess of
the duration setting.
CC Not Detected – 708
The Closed Caption Not Detected 708 alarm is activated when the presence of
EIA-708-B closed caption data with valid parity bits is not detected for a period in
excess of the duration setting.
CC Not Updating – 708
The Closed Caption Not Updating 708 alarm is activated when closed caption carrier is
present and the EIA -708-B data word is null for a period in excess of the duration
setting.
Teletext Not Detected – SD
The Teletext Not Detected SD alarm occurs when the presence of Teletext is not
detected for a period in excess of the duration setting.
Subtitle Not Detected
The Subtitle Not Detected alarm occurs when the presence of Subtitles is not detected
for a period in excess of the duration setting.