Audio Output; Advanced Audio - Axis 211W User Manual

The Enable microphone power option provides DC power for an external microphone. If using a small electret
microphone such as a clip-on mic or a PC microphone, this option needs to be enabled.
Note:
When using a high impedance dynamic microphone Enable microphone power should not be checked. To use a professional micro-
phone requiring 48V phantom power, you need an external power supply and must use a balanced-unbalanced converter (audio trans-
former) in between.
Set Input sensitivity to High or Low depending on the sound level in the monitored area. For example, if the
AXIS 211W is installed in a noisy environment set the sensitivity to Low. When using an external microphone
set the Input sensitivity to High if you are using an ordinary, unamplified microphone. Set the sensitivity to
Low if the connected microphone has a built-in line amplifier.
Enable microphone power with electret microphones that have no battery. Do not use this setting with a
dynamic or battery powered microphone.
Select the desired audio Encoding format G711, G726 or AAC.
Depending on the selected encoding, set the desired Bit rate (audio quality). The settings affect the available
bandwidth and the audio quality, i.e. a high bit rate setting requires more bandwidth.
The AXIS 211W can be set to trigger an event if the incoming sound level rises above, falls below, or passes the
set value. The Alarm level is set between 0-100%.

Audio Output

If the sound from the speaker is too low or high, adjust the output gain for the active speaker attached to the
AXIS 211W. When satisfied with the settings, click Save, or click Reset to revert to the previously saved
settings.

Advanced Audio

Advanced audio settings can
improve audio quality by speech
filtering, echo cancellation or setting
the noise canceller threshold value
or attenuation.
When enabled, the speech filter
reduces noise by filtering out all the
frequencies below 100HZ and above
3500 Hz. This improves the sound
quality if a person is close to the
microphone when talking and will
reduce background noises.
Enable echo cancellation to reduce acoustic echoing that can be caused by audio coming from a speaker being
captured by a microphone.
Noise canceling is a way of reducing the background noise if the microphone, for example, is set up in a noisy
environment and you are only interested in hearing a person who is talking close to the microphone. The noise
canceller attenuation produces maximum noise reduction when set to 18dB of attenuation. Optimize the sound
quality by listening to the sound and adjusting the attenuation level as required.
AXIS 211W - Audio Settings
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