HIKVISION NVST HNR Series User Manual page 168

Audio exception detection detects abnormal sounds in the surveillance scene, such as a sudden
increase/decrease in sound intensity.
Go to System > Event > Smart Event.
Select a camera to configure.
Click Audio Exception.
Optionally, check Save VCA Picture to save the captured audio exception detection pictures.
Set the detection rules:
Select Exception Detection.
Check Audio Loss Exception, Sudden Increase of Sound Intensity Detection, and/or Sudden
Decrease of Sound Intensity Detection.
Audio Loss Exception: Detects a steep sound rise in the surveillance scene. You can set the
detection sensitivity and threshold for steep sound rise by configuring its Sensitivity and
Sound Intensity Threshold.
Sensitivity: The smaller the value, the more severe the change must be to trigger the
detection. Range [1-100].
Sound Intensity Threshold: It can filter the sound in the environment. The louder the
environment sound, the higher the value should be. Adjust it according to the environment.
Range [1-100].
Sudden Decrease of Sound Intensity Detection: Detects a steep sound drop in the
surveillance scene. You need set the detection sensitivity [1-100].
Set the arming schedule. Refer to Chapter 12.1 Configure Arming Schedule.
Set the linkage actions. Refer to Chapter 12.2 Configure Alarm Linkage Actions.
Click Apply.
Network Video Recorder User Manual
Audio Exception Detection
167