Advanced Aec Controls - Extron electronics DMP 128 User Manual

Select Reference
Select the AEC reference from a drop-down list, populated with the
following:
Output channels (1 to 8)
•
• Input channels (1 to 12)
• Virtual Return channels (A to H)
Noise Cancellation
Noise cancellation can be 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 remove 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 available, in 0.1 dB increments.
Setting Gain Structure for AEC
It is important to optimize the audio levels of the DMP 128 for AEC to be effective (see
Optimizing Audio Levels

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 button to load pre-set values to
the three NLP parameters; Max NLP Reduction, Attack
Time, and Release Time.
Soft
•
Normal
•
Aggressive
•
The default parameters (shown at right) match the Normal 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.
on page 101).
DMP 128 • Software Control 44