Axis Communications AXIS 214 PTZ - Manual (Page 28)

28 AXIS 214 PTZ - Audio
Advanced Audio Settings
The Advanced Audio settings allow you to tune the external microphone connected to the
AXIS 214 PTZ’s connection module 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).
Enable echo cancellation reduces acoustic echoing if sound from the speaker is captured
by the microphone.
Noise canceling is a way of reducing the background noise when 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 214 PTZ when someone is
speaking close to the microphone. There are two adjustable parameters available to
optimize this function:
• Noise canceller threshold value
• Noise canceller attenuation
When the incoming sound is louder than the threshold, it will pass without any changes.
When lower than the threshold, the incoming sound 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 canceller 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.