User's Manual

Network Video Recorder User Manual
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Figure 9-8 Set Audio Exception Detection Rules
1) Check the checkbox of Audio Input Exception to enable the audio loss detection function.
2) Check the checkbox of Sudden Increase of Sound Intensity Detection to detect the sound
steep rise in the surveillance scene. You can set the detection sensitivity and threshold for
sound steep rise.
Sensitivity: Range [1-100], the smaller the value is, the more severe the change should be
to trigger the detection.
Sound Intensity Threshold: Range [1-100], it can filter the sound in the environment, the
louder the environment sound, the higher the value should be. You can adjust it according
to the real environment.
3) Check the checkbox of Sudden Decrease of Sound Intensity Detection to detect the sound
steep drop in the surveillance scene. You can set the detection sensitivity[1-100] for sound
steep drop.
Step 6 Click Apply to activate the settings.
9.9 Sudden Scene Change Detection
Purpose:
Scene change detection function detects the change of surveillance environment affected by the
external factors; such as the intentional rotation of the camera, and some certain actions can be
taken when the alarm is triggered.