CNB MDC4050VR - Manual (Page 26)

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Network Camera_ User manual
2.13. Audio Detection
Set the audio detection level. Audio detection is treated as a motion detection in the system.
Fig. 2-13. Audio Detection Setup
Item Description
Audio Detection
Threshold
Set the sensitivity of audio detection for each channel. Default is 50.
The Lower the value, the higher the sensitivity.
Note that false audio alarm can be generated at unnecessary high sensitivity,
so you need to set the value to most appropriate level after testing.
Set Threshold
Audio input level is drawn in as a bar graph. Set the threshold level. Audio
detection event is generated if input audio exceeds threshold level which is
indicated as a red horizontal line.