7847FSEDA Series
Frame Synchronizer and Distribution Amplifier
Page - 26
Revision 0.1
pixels above the
white error level
exceeds the number of pixels (threshold) defined by the
Error
Quantity
control.
Black/White Level Error Duration:
This control sets the number of seconds of consecutive video
fields/frames that must be flagged as having black/white level errors before triggering the
corresponding black/white level error fault condition. The value range is from 1 to 127 seconds in
increments of 1 second.
Black/White Level Error Timeout:
This control sets the number of seconds of consecutive video
fields/frames that
must not be flagged
as having black/white level errors before the corresponding
black/white level error fault will be cleared. The value range is from 1 to 127 seconds in increments
of 1 second.
Black Warning Level:
This control sets the amplitude of active picture content (in IRE) below which
a pixel is considered to be normal black content within the active picture. The value range is from
7.306 IRE to 38.242 IRE.
The center section of active picture of a field of video is analyzed and a total number of pixels below
this level is calculated. The field of video is considered to be
in error
when the number of pixels
below the Black
Warning Level
is below the number of pixels (threshold) defined by the
Error
Quantity
control.
White Warning Level:
This control sets the amplitude of active picture content (in IRE) above which
a pixel is considered to be normal white content within the active picture. The value range is from
38.356 IRE to 94.863 IRE.
The center section of active picture of a field of video is analyzed and a total number of pixels above
this level is calculated. The field of video is considered to be
in error
when the number of pixels
above the W
hite Warning Level
is below the number of pixels (threshold) defined by the
Error
Quantity
control.
Black/White Level Warning Duration:
This control sets the number of seconds of consecutive
video fields/frames that must be flagged as having black/white level warnings before triggering the
corresponding black/white level warning fault condition. The value range is from 1 to 127 seconds in
increments of 1 second.
Black/White Level Warning Timeout:
This control sets the number of seconds of consecutive
video fields/frames that
must not be flagged
as having black/white level warnings before the
black/white level warning fault will be cleared. The value range is from 1 to 127 seconds in
increments of 1 second.
Trap Enable and Trap Status
To enable/disable a specific fault trap, check/uncheck the corresponding checkbox.
Video Errors:
This trap will
trigger
when a set of consecutive input video frames of length greater
than V
ideo Error Duration
all contain video errors. This trap will
clear
when a set of consecutive
input video frames of length greater than
Video Error Timeout
are video error-free.
Video Black:
This trap will trigger when a set of consecutive input video frames of length greater
than
Video Black Duration
all contain active picture content below 7 IRE. This trap will
clear
when a
set of consecutive input video frames of length greater than
Video Black Timeout
does not contain
active picture content below 7 IRE.
