DMP 128 FlexPlus • DSP Configurator Software 29
9
Cancel Button — Reverts any changes made to the contained parameters back to
their states when the current instance of the AEC dialog box was opened and closes the
dialog box.
¢
Show/Hide Advanced Options Button — Shows or hides the advanced
configuration options for the AEC processor (AEC Advanced Options below).
£
AEC Help Button — Opens the Acoustic Echo Cancellation topic of the
DSPConfiguratorHelp file for further assistance in operating AEC processor.
AEC Advanced Options
The AEC dialog box provides advanced NLP (non-linear processing) options for fine tuning
echo cancellation. These options are hidden by default. Click the Show/Hide Advanced
Options
button to access them (see figure 47,
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on the previous page).
Figure 48. AEC Advanced Options
1
Enable NLP Checkbox — Checked by default, NLP (non-linear processing) is required
to completely remove echo.
2
NLP Presets — Offers three preset options for NLP parameters.
• Soft — Applies soft preset values to the NLP reduction parameters for light echo
cancellation.
• Normal (default) — Applies normal preset values to the NLP reduction parameters
for the widest array of echo cancellation needs.
• Aggressive — Applies aggressive preset values to the NLP reduction parameters
for aggressive echo cancellation.
3
NLP Reduction Parameters — Provides text boxes for Max NLP Reduction, Attack
Time
, and Release Time to customize NLP reduction parameters.
4
Double Talk Echo Reduction — Provides a text box to enter a reduction value (in dB)
when double talk occurs. Double talk is when near end talkers and far end talkers are
speaking simultaneously while AEC is engaged.
5
Comfort Noise Text Box — Provides an ambient noise signal to prevent states of
complete silence that may be perceived as a failed or dropped connection. 0 dB is the
default.
figure 40. AEC Advanced Options
1
Enable NLP Checkbox
2
NLP Presets
3
NLP Reduction Parameters
4
Double Talk Echo Reduction
5
Comfort Noise
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