Axis Video Server 241SA User Manual page 26

AXIS 241QA/AXIS 241SA - Audio
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When the incoming sound is louder than the threshold, it will pass without any change.
When lower than the threshold, the incoming sound is reduced by a certain attenuation
factor. The threshold value should be set higher than the background noise, but lower than
the useful audio.
The noise canceller threshold value can be set to High, Medium High, Medium low and
Low. A lower threshold will allow most of the audio to pass. Only the weakest background
noise is reduced. A higher threshold makes the noise canceller act on even stronger
background noise. At the maximum level High, there is a risk of reducing useful audio as
well.
There is a trade-off between noise cancelling and sound quality. In other words, increasing
the Noise canceller attenuation value compromises sound quality. Adjust the threshold
and the attenuation to an optimum level by listening and changing the levels.