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Closed Caption detection
• Closed Caption (ANC 608) - present/not present
• Closed Caption (ANC 708) - present/not present
Error Checking parameters
• CRC Check - Checks for valid CRC (EDH in SD). Counts number of errors since last reset.
OmniView calculates a new CRC value from the incoming data, and compares this value with the
CRC value embedded in the data. If there is a difference, OmniView will flag this as an error.
• Gamut check - checks the YUV data to see that it would be valid if converted into RGB space. The
RGB valid range is programmable at both minimum and maximum thresholds. Counts number of
errors since last reset. The range of valid values is set on the Video Engineering menu.
• Range check - checks the YUV data to ensure that it falls within the valid part of the range. For each
of Y, U and V, there are programmable minimum and maximum thresholds. Counts number of errors
since last reset. The range of valid values is set on the Video Engineering menu.
• TRS check - Checks for valid TRS data. Counts number of errors since last reset.
• ANC check - checks for valid checksums on the ancillary data. Counts number of errors since last
reset.
• LIN check - (HD only) checks that the line number specified in the TRS packet agrees with the line
number calculated internally. Line numbers are not included in TRS packets in SD.
All parameters in the Error Checking section have a simple line graph which shows the status of each
parameter over the last few seconds. This is a thin line displayed under the error counter display. After
resetting the error counter, the line is fully black. As time passes with no errors, the line is gradually
turned pale green. Periods of time when errors occurred are coloured red. So by looking at this line, you
can see whether errors are in bursts, or periodic, etc.
Timecode Checking
OmniView can check timecode on the serial input. The reader is configured using the Time Code page of
the Engineering dialogue box, described on page 18 of this manual.
Where timecode is present, it is displayed at the bottom of the Video Status window, under the error
checking lines. In SD it is possible to display VITC and ATC. Only ATC is available in HD.
As well as displaying timecode values, OmniView monitors the timecode to ensure that it increments
correctly from frame to frame. Each time that a timecode value is duplicated in adjacent frames, or is
discontinuous from frame to frame, it is counted, and these count values are displayed in the Video
Status window. There are separate counters for VITC and ATC.
ATC is a timecode packet, and can be loaded with LTC, VITC 1, or VITC 2. The choice of timecode type
is set in the Timecode section of the Engineering dialog.
VITC detection parameters. (Vertical Interval timecode) (SD only)
• VITC stuck frames. Counts number of stuck frames since last reset. (Looks for timecode not
incrementing)
• VITC skipped frames. Counts number of frames skipped since last reset. (Looks at the timecode,
and detects whenever a timecode value is missed)
• Actual display of incoming VITC timecode, or detection if timecode not present, or if corrupt.
ATC detection parameters. (Ancilliary data timecode)
• ATC stuck frames. Counts number of stuck frames since last reset. (Looks for timecode not
incrementing)
• ATC skipped frames. Counts number of frames skipped since last reset. (Looks at the timecode, and
detects whenever a timecode value is missed)
• Actual display of incoming ATC timecode, or detection if timecode not present, or if corrupt.
