MITSUBISHI ELECTRIC DX-TL4516U - Manual (Page 56)

53
Operations
Long pre-alarm recording
Long pre-alarm recording is a function to perform pre-alarm
recording for a maximum of 60 minutes before the emergency
recording is started.
To set LPA area, set the desired capacity in “Long Pre-
Alarm Area” ( page 77 “Change Partition Setting”).
When the long pre-alarm recording is started during
normal recording, not all the camera numbers set for long
pre-alarm recording may be used for recording.
To perform the long pre-alarm recording by all the camera
numbers set for emergency recording:
i) To perform with normal recording:
Set all the desired cameras to normal recording set-
ting. Long pre-alarm recording is performed at the pic-
ture grade of “L6-30KB” regardless of the setting and
at the recording rate set for normal recording.
ii) To perform with normal and alarm recordings:
Set the “Alarm Mode” to “Alarm Plus.”
(Normal recording) Set all the desired cameras to
normal recording setting. Long pre-alarm recording is
performed at the picture grade of “L6-30KB” regard-
less of the setting and at the recording rate set for
normal recording.
(Alarm recording) During alarm recording, long pre-
alarm recording is performed at the picture grade of
“L6-30KB” regardless of the setting. And for only the
cameras used for alarm recording, long pre-alarm re-
cording is performed at the alarm recording rate.
iii) To perform with alarm recording:
Set the “Alarm Mode” to “Alarm Plus.”
Long pre-alarm recording is performed at the picture
grade of “L6-30KB” regardless of the setting and at
the recording rate set for alarm recording.
Long pre-alarm recording is executed with the recording
rate of the normal or alarm recording set for that time
period and with the picture grade of “L6-30KB.”
Cautionary notes for long pre-alarm recording
• When long pre-alarm recording time is set, the unit
records the data in LPA area at all times. Set the
recording rate and picture grade carefully when long pre-
alarm recording is performed simultaneously with normal
or alarm recording. Depending on the setting, picture
may be missed during recording. Particularly, in case of
recording for serial bus HDD, set the recording rate not to
exceed 120 pps.
• The recording for LPA area is carried out for the longer
time than the specified because the data in the LPA area
is processed in 512 MB unit.
• In the LPA area, alarm list or recording data may not be
stored in the chronological sequence. The easier way to
search the desired data is, before searching the data,
search the oldest recording data using
• In the LPA area, all the existed recording data is deleted
and overwritten when the capacity becomes full. It is
recommended to make copy of the important data to the
other medium using the function such as copy 2.
To start copy from the oldest data, set the copy start time
to the start time of recording which can be checked in
• In the LPA area, data is recorded at all times and when
the emergency is input, the data is locked to prevent
overwriting.
For example, when the data A1 to A3 and B1 to B3 are
recorded in the first and second rounds of recording
respectively, the chronological sequence of the recording
data is: A1 A2 A3 B1 B2 B3.
However, storing order of the data on HDD is: B1 A1
A2 B2 A3 B3, and the data is played back or listed
in alarm list in that order.
Recording end point
Recording start
point of HDD
B1
A1
A2
A3
B2
B3
: Recording data of the first round
: Recording data of the second round
Audio Recording Setup
This item is used to set the audio recording. This unit
simultaneously records audio along with the picture for
camera number 1. When recording audio, HDD space is used
faster than when only picture is recorded.
Recording 1
6
Setup Menu
Audio Recording Setup
step 1. Set the audio recording mode.
Off: Does not record audio.
Normal: Records pictures and audio during
recording (normal, alarm, or emergency recording).
Alarm: Records pictures and audio during alarm
or emergency recording.
To record audio, the camera number 1 must be set to
record. The camera number 1 corresponds to AUDIO IN 1
terminal.
When the recording mode changes from normal recording
to alarm recording, or from alarm recording to normal
recording, audio may be cut off temporarily. This is normal
and not a malfunction.
When alarm area is set in the main device and “Audio
Recording Mode” is set to “Alarm,” the audio is recorded
in the alarm area with the picture. (
page 77)
To copy the recorded audio as the digital data, copy the
picture of camera number 1.
You can hear live audio any time except during playback.
The live audio switches to playback audio when you start
playback or triplex playback.