Audio Detection; Thermal Alarm - Dahua NVR21-4KS3 Series User Manual

You can configure up to four detection regions. When any one of the four regions
activates an alarm, the channel where this region belongs to will activate an alarm.
6) Right-click to exit the page.
Step 4 Click Setting next to Schedule to configure the alarm schedule.
Step 5 Configure the anti-dither period.
If multiple alarms occur during the anti-dither period, the system only record the event
once.
Step 6 Configure alarm linkage. For details, see Network Video Recorder_User's Manual.
Step 7 Click Apply.

5.10.6 Audio Detection

The system can generate an alarm once it detects the audio is not clear, the tone color has changed
or there is abnormal or audio volume change.
Procedure
Select Main Menu > ALARM > Audio Detection.
Step 1
Step 2 Select a channel and then click
intensity change.
● Audio Exception: The system generates an alarm when the audio input is abnormal.
● Intensity Change: Set the sensitivity and threshold. An alarm is triggered when the
change in sound intensity exceeds the defined threshold.
Step 3 Click Setting next to Schedule to configure the alarm schedule.
Step 4 Configure alarm linkage. For details, see Table 5-50.
Click Apply.
Step 5

5.10.7 Thermal Alarm

Background Information
After receiving the alarm signal from the connected thermal devices, the system can recognize the
alarm type, and then trigger the corresponding alarm actions.
The system supports heat alarm, temperature (temperature difference) and cold/hot alarm.
● Heat alarm: The system generates an alarm once it detects there is a fire.
● Temperature (temperature difference): The system triggers an alarm once the temperature
difference between two positions is higher or below the specified threshold.
● Cold/hot alarm: The system triggers an alarm once the detected position temperature is higher
or below the specified threshold.
to enable detection of audio exception and
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User's Manual