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AXIS A8004-VE Network Video Door Station
Video and Audio
Dynamic Processing
Dynamic processing is used to improve the perceived sound quality. It consists of a group of technologies that correct and control
audio signals. Common dynamic processing methods include reducing the volume of loud unwanted sounds and amplifying quiet
sounds.
In the Axis product, the following dynamic processing methods are available:
• Audio processing – Select to enable audio processing, which includes equalization that balances the levels of different
frequencies and automatic gain control that amplies weak signals.
When selected, echo cancellation and noise reduction are automatically enabled.
• Echo cancellation – Select to cancel echoes from transmitted signals. Echoes typically occur when sounds travel from the
speaker and back to the microphone, or when signals leak between neighboring wires. These signals will be identied and
canceled, saving users from hearing repetitions of their own voices.
• Noise reduction – Select to reduce background noise and enhance speech. Unwanted processing noise, for example music
playing in the background, will be avoided and speech will sound clearer.
Audio Input
Use the Input gain to control the volume of the audio input. If the sound is too low, choose a higher dB value, to amplify the
sound. If the sound is too high, choose a lower dB value. The Level bar gives a visual representation of the audio signal level in dB
relative to the full-scale input level.
• Green — the signal is at a good level.
• Yellow — the signal is becoming distorted.
• Red — the signal is distorted.
Use the Encoding option to select digital audio encoding format.
• AAC requires a license for both encoding and decoding. AAC is the least complicated and most widely used codec. If
achieving the best possible audio quality is a priority, AAC is the recommended codec to use. An AAC license is included
in the Axis product.
• G711 is an unlicensed standard codec that is useful when integrating audio into a VoIP system
• G726 is an unlicensed speech codec that is most commonly used within the security industry.
Note
If recording audio to edge storage, such as an SD card or network share, use AAC encoding.
The Sample rate denes the number of times per second the sound is sampled. A higher sample rate will provide better audio
quality, but also requires a greater bandwidth.
Set the required Bit rate depending on the selected encoding. A higher bit rate will give better audio quality. A lower bit rate
may have latency or delay, but will require less bandwidth.
For more information about these settings, please see the online help
.
Audio Output
Congure the audio output settings under Video & Audio > Audio Settings.
Output gain - Control the volume of the line audio output. If the sound is too low, choose a higher dB value. If the sound is
too high, choose a lower dB value.
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