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Step 2 Configure parameters. See Table 4-47.
Parameter
Description
Channel
In the Channel list, select a channel to set.
Input
Check the box here, system can generate an alarm once the audio input is
abnormal
abnormal.
Intensity
Check the box here, system can generate an alarm once the audio volume
change
becomes strong.
Period
Define a period during which the function is active.
Sensitivity
The higher the value is, the easier it is to trigger an alarm. But at the same time,
the false alarm may occur. The default value is recommended.
You can set intensity change threshold. The smaller the value is, the higher the
Threshold
sensitivity is.
The alarm device (such as lights, sirens, etc.) is connected to the alarm output
Alarm Out
port. When an alarm occurs, the NVR device transmits the alarm information to
the alarm device.
Latch
When the alarm ends, the alarm extended for a period of time. The time range is
from 0 seconds to 300 seconds.
Figure 4-175
Table 4-47
Local Basic Operation 238
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