Advanced Audio Settings - Axis 210 User Manual

AXIS 210/211/211A - Audio (AXIS 211A only)
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Advanced Audio Settings

Audio Quality Settings
The Advanced Quality Settings page allows you to tune the internal or external
microphone connected to the AXIS 211A to suit your environment.
Enable speech filter improves the sound quality when the microphone is placed close to
the person talking and can also help reduce background noise. The filter cuts the lowest
and the highest frequencies. The bypass frequency range is approximately 250Hz to
3700Hz (measured at -10dB cut-off break points).
Noise cancellation is a way of reducing the background noise while there is no useful
audio present. A typical application could be that the camera is set up in a noisy
environment, and you are only interested in hearing the sound from the AXIS 211A when
a person is talking close to the microphone. There are two adjustable parameters available
to optimize this function:
• Noise canceller threshold level
• Noise canceller attenuation
When the incoming sound is louder than the threshold, it will pass without any changes.
When the incoming sound is weaker than the threshold, it will be 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 cancellation threshold value can be set to High, Medium High, Medium low
and Low. A lower threshold will accept most of the audio to pass. Only the weakest
background noise will be reduced. A higher threshold will make 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 canceling and sound quality. In other words, increasing
the noise canceller attenuation deteriorates sound quality. Adjust the threshold and the
attenuation to an optimum by listening and changing the levels.