Axis Communications 243SA - Manual (Page 26)

26 AXIS 243SA - Audio
Depending on the selected encoding, set the desired Bit rate (audio quality). The settings
depend on the available bandwidth and the required audio quality, that is, a high bit rate
setting requires more bandwidth.
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 attached to the Axis video server.
When satisfied with the settings, click Save, or click Reset to revert to the previously saved
settings.
Advanced Audio Settings
The Advanced Quality Settings allows you to tune the audio input to suit your
environment.
Enable speech filter improves the sound quality while using a microphone that 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 points).
Enable echo cancellation can reduce the feedback generated when using full duplex. If
there is sound distortion, turning echo cancellation off may improve the sound quality.
Noise cancelling helps reduce background noise when there is no useful audio present. A
typical application could be when there is a noisy environment and you are only interested
in hearing the sound when someone is speaking close to a 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 changes. When
lower than the threshold, the incoming sound is reduced by a certain attenuation factor.
The threshold value should be set higher than the background noise, but lower than the
useful audio.