Dahua Technology NVR41 Series, User Manual, Page: 190 / 355

Local Basic Operation 178
Parameter Description
Delay
At the end of the alarm, the recording extends for a period of time. The
time range is from 10 seconds to 300 seconds.
Tour
Select the check box and select the channel for tour. When an alarm
occurs, the local interface of the NVR device displays the selected
channel screen.

You need to set the time interval and mode for tour first, see
"4.17.2 Tour."
 After the tour is over, the preview interface is restored to the screen
split mode before the tour.
Log
Select the check box, the NVR device records the alarm information in
the log when an alarm occurs.
Voice Prompts
Check the box and then select the corresponding audio file from the
dropdown list. System plays the audio file when the alarm occurs.
Refer to " 4.18.1 File Manage " to add audio file first.
Buzzer Select the check box to activate the buzzer when an alarm occurs.
Step 9 Click OK , system goes back to human face recognition interface.
Step 10 Click Apply to complete the settings.
The interface is shown as Figure 4-125 if there is matched result.
Figure 4-125
4.7.2.4 IVS (General Behavior Analytics)
The IVS function processes and analyzes the images to extract the key information to match
with the specified rules. When the detected behaviors match with the rules, the system
activates alarms.

This function is for some series product only.

IVS function and human face detection function cannot be valid at the same time.
The IVS function environment shall meet the following requirements:

The object total size shall not be more than 10% of the whole video.

The object size on the video shall not be more than 10pixels*10 pixels. The abandoned