Advanced Aec Controls - Extron electronics AXP 50 C AT User Manual

Noise Cancellation
Noise cancellation is switched on or off from the AEC dialog. The noise canceller detects
steady state noise, such as HVAC or other continuous system noise, and effectively
removes it without causing audible artifacts.
Noise cancellation is engaged or disengaged using a checkbox. When the box is checked,
noise cancellation is engaged, or switched on. When cleared, noise cancellation is
disengaged, or switched off. The default setting is noise cancellation switched on and set to
15 dB of noise attenuation.
Up to 20 dB of noise cancellation is possible, in 0.1 dB increments.

Advanced AEC Controls

Click on the open/collapse icon at the bottom of the AEC dialog to reveal the advanced
AEC controls.
Advanced control functionality is as follows:
Non-linear Processing (NLP) Controls
• Enable NLP – This box is selected by default. NLP is
necessary for the removal of echo.
• NLP Presets – Click
a set of values to the three NLP parameters: Max NLP
Reduction, Attack Time, and Release Time.
The default parameters (shown at right) match the
preset.
Max NLP Reduction – The maximum possible reduction
•
in echo artifacts that can be applied. The range is 0.0 to
80.0 dB in 0.1 dB increments.
Default is 50.0 dB.
• Attack Time – The speed in which NLP is applied. The range is 0.0 to 100.0 msec in
0.1 msec increments.
Default is 6.0 msec.
• Release Time – The speed in which NLP is released. The range is 1.0 to 3000.0 msec
in 0.1 msec increments.
Default is 150.0 msec.
Additional controls
• Double Talk Echo Reduction – Sets the amount of echo reduction applied during
double-talk. The range is 0.0 to 20.0 dB in 0.1 dB increments.
Default is 15.0 dB.
• Comfort Noise – Sets a comfort noise level in dB to eliminate states of complete
silence, which could be perceived as a failed connection. The range is 0.0 to 40.0 dB in
0.1 dB increments.
Default is 0.0 dB (comfort noise off).
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Soft Normal Agressive
AXP 50 C AT • DSP Configurator – Configuration and Operation
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