Glossary of Terms
Pre-alarm and post-alarm recording
Pre-alarm and post-alarm recording involve
recording data according to a selected ratio in
the camera’s internal memory. The default ratio
is pre-alarm = 0% / post-alarm = 100%. When an
alarm is detected in this condition, only
post-alarm images are recorded in the camera’s
internal memory.
•
Post-alarm recording is the recording of
alarm data after an alarm has been detected
by an external sensor or motion detector.
When an alarm is detected, the alarm data is
recorded into the internal memory according
to the ratio selected. If the ratio is 100%, all
of the available memory space is devoted to
post-alarm recording.
•
Pre-alarm recording sequentially records
alarm images from immediately before the
alarm was detected according to the ratio
selected. When an alarm is detected, images
from before the alarm that fall within the
amount specified by the ratio selected are
recorded in the pre-alarm area of the internal
memory.
For example, if the alarm recording area of
the internal memory is set to a ratio of
30%/70%, 30% of the available area is
devoted to recording images from
immediately before the alarm is detected.
Actual alarm images are then recorded in the
remaining 70%, and the pre-alarm and
post-alarm recordings are treated as a single
alarm event.
When alarm images are played back, the
images can be viewed continuously starting
from the first images recorded immediately
before the alarm was detected. The alarm
recording area ratio is an important point for
consideration when making settings.
(Alarm input)
(Alarm input)
Post-alarm recording area (100%)
Post-alarm recording area (70%)
Pre-alarm
recording
area (30%)
(Internal memory: approx. 16 MB)
(Internal memory: approx. 16 MB)
L5AM2/XE (VCC-WB4000P) GB 2004, 2, 17
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English