Audio
Use the settings on the Audio page to adjust the audio quality of the Video Intercom.
For encoding the audio stream, you can choose from the Opus sound encoder, which produces high-quality
sound, or the G.711 protocol sound encoder. Use the Opus encoder if you are using ACC software Release
6.10 or later (or a third-party video management system that supports the Opus protocol). Otherwise use the
widely supported G.711 protocol.
Echo cancellation and noise reduction are built into the Video Intercom. Echo cancellation removes the
speaker output signal from the microphone signal, which prevents the operator at the other end from
hearing an echo of their own voice. Noise reduction removes background noise from the microphone
signal, and you can set the sensitivity to background noise. You can also set the speaker volume and the
microphone output levels.
1. In the Audio Settings section:
a. In the
Encoding
field, specify the audio encoder to use:
l
Opus
: Default high quality audio codec.
l
G.711
: Supported on various platforms.
b. Clear the
Echo Cancellation & Processing
check box to disable all audio processing, including
echo cancellation, noise reduction, and auto gain control. This is enabled by default.
c. In the
Noise Reduction
field specify the noise reduction strength to apply to reduce
background noise.
The default level of 7 is suitable for a moderately noisy environment, while a value in the range
1 to 3 is suitable for quiet indoor environments with little background noise.
In a noisy environment, strange-sounding background noise usually indicates that the
Noise
Reduction
setting is too low. In this case, increase the value of this setting. Audio quality may
be affected at settings higher than the default.
When set to
Off
, noise reduction is disabled completely.
2. In the Device Speaker section, use the
Volume
slider to adjust the volume on the speaker (from 0 to
100).
3. In the Device Microphone section:
a. Use the
Output Level
slider to adjust the output of the microphone. The default level is 0 dB,
and you can reduce the output level by as much as 40 dB . This volume level is applied after
auto gain control and other processing. Lower the output level to match the volume from the
Video Intercom to other devices.
b. Check
Auto Gain Control
to maintain the microphone output level to be as constant as
possible. The microphone signal is increased when someone is talking quietly, and decreased
when someone is talking loudly into the microphone. This keeps the resulting volume level
constant for the operator.
c. There is a Microphone Muting drop-down menu for the Video Intercom that regulates the
Audio
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