Axis Communications AXIS 213 PTZ user manual Audio Advanced, Audio Output, Audio Quality Settings

AXIS 213 PTZ 20

When using half-duplex, the Send the sound from the active client to all other clients option transmits the audio signal from the client that is talking to all the other clients.

Audio Input

If there are problems with the sound input being too low or high, it is possible to adjust the input gain for the microphone connected to the AXIS 213 PTZ.

Audio Output

If the sound from the speaker is too low or high it is possible to adjust the output gain for the active speaker connected to the connection module.

When satisfied with the settings, click Save, or click Reset to revert to the previously saved settings.

Audio - Advanced

The advanced audio settings allows you to tune the external microphone connected to the AXIS 213 PTZ connection module to suit your environment.

Audio Quality Settings

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 213 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.

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.