Section 6
♦
Alarm Descriptions
CMN-41 Series Installation and Operation Handbook
95
Copyright © 2009, Harris Corporation
•
Gamut
: Gamut alarms are used to indicate when components of an RGB, Luma, or
peak signal fall outside upper or lower preset limits.
•
RGB Gamut Upper/Lower
: The RGB Upper and Lower alarm occurs when any
component of the transcoded RGB signal falls outside the upper or lower limits
for a period in excess of the duration setting. The Sensitivity can be increased to
provide immunity to fast transcoding spikes.
•
Luminance Gamut Upper/Lower
: The Luminance Upper and Lower alarms
scan the composite encoded signal derived from the selected digital input. The
alarms occur when the luminance video falls outside the adjustable limits for a
period in excess of the duration setting. The Sensitivity can be increased to
provide immunity to fast noise spikes.
•
Peak Gamut Upper/Lower
: The Peak Upper and Lower alarms scan the
composite encoded signal derived from the selected digital input. The alarm
occurs when the peak video falls outside the adjustable limits for a period in
excess of the duration setting. The Sensitivity can be increased to provide
immunity to fast noise spikes.
•
CRC-HD
: The CRC-HD alarm occurs when the internally calculated CRC value is
different from the received CRC value.
•
EDH – SD
: Per SMPTE RP 165-1994; the EDH-SD alarm occurs when one or
more errors are detected for a period in excess of the duration setting.
•
Letterbox – SD
: The Letterbox is the top and bottom border surrounding the active
video. The top border is defined as having video below the threshold on the set line
and having video above on the following line. The bottom border is defined as
having video above the threshold on the previous line and video below the
threshold on the set line. The Letterbox SD alarm is activated when either the top
line or the bottom line deviates from the user settings (Standard Definition only).
•
Pillarbox – HD
: The PillarBox is the border to the right and left of the active
video. The “End of Left Border” and “Start of Right Border” defines the set points
when the video is below the threshold. If the video is outside of the threshold and
CES values for the specified duration, the Pillar Box HD alarm occurs (High
Definition only).
•
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.
•
Timing
: The Timing Alarm occurs when the Time and Line range(s) are exceeded
for a period in excess of the duration setting.
