Extron electronics XMP 240 C AT, Руководство пользователя

Страница: 35 / 139

XMP 240 C AT • DSP Configurator Software 29
5
Reference Selection Drop-Down Menu — (See figure 44 on the previous page)
Provides all inputs, outputs, and virtual returns for reference selection. When a channel
is selected as the reference, the AEC processor compares the reference channel signal
to the current input channel.
6
Noise Cancellation Panel — Provides a checkbox to engage the noise canceller
(engaged by default) and text field to enter the amount of noise reduction in dB.
7
Bypass Button — Bypasses the AEC processor. When the button is red, bypass is
enabled.
8
OK Button — Confirms changes made to the contained parameters and closes the
AEC
dialog box.
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
DSP Configurator Help 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 44 ,
¢
on the previous page).
Figure 45. 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
1
Enable NLP Checkbox
2
NLP Presets
3
NLP Reduction Parameters
4
Double Talk Echo Reduction
5
Comfort Noise