Axis Communications Axis 211A - Manual (Page 29)

29 AXIS 210A/211A - Audio
When the incoming sound is louder than the threshold it passes without being affected.
When lower than the threshold, the incoming sound is reduced by a certain attenuation
factor. The threshold level should be set higher than the background noise, but lower than
the useful audio.
The noise ca nceller threshold value can be set to High, Medium High, Medium low or
Low. A lower threshold allows most 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 thus always a trade-off between noise canceling and sound quality. In other
words, increasing the noise canceller attenuation results in deterioration in sound quality.
To adjust the threshold and attenuation to an optimum level, change the levels and then
listen to the result.
AXIS Media Control (AMC)
The AMC control panel can also be used to configure various audio settings, such as start
settings and talk button options. The AMC control panel can be opened by right-clicking
on the video image in the Live View web page. Please see the readme file included in the
tool for more information.