User Manual

Chapter 6 Component Guide
DME Designer Owner’s Manual
486
 Advanced Settings Editor Window
Click the [Advanced] button in the AEC component editor window to open this window. The Advanced
Settings editor window includes microphone settings for each AEC channel.
When a microphone with a PTT (Push To Talk) switch is used, a small amount of noise may be
produced when the PTT switch is off. The AEC system may mistakenly “learn” the noise, resulting in an
unwanted echo when the PTT switch is turned on and speech is resumed. This window includes
settings that can prevent this type of problem, as well as specify how the microphones will be used.
Parameter Range Function
1
PTT On ON/OFF When this button is turned ON and the microphone level is
below the specified (3) PTT Threshold setting, the system
determines that the PTT switch is ON and AEC “learning” is
suspended. When the noise level is low or a microphone that
does not have a PTT switch is used, this function can be
turned OFF for improved learning performance.
2
Mic In. meters Display the input levels from the near-end microphones (these
meters perform the same functions as the Mic In. meters in the
AEC component editor window). These meters can also be
used to judge the level of noise being produced when the
microphone PTT switch is OFF.
3
PTT Threshold -80 ~ -20 Specifies the base level for AEC learning. When the (1) PTT
On parameter is turned ON, AEC “learning” is suspended
when the input to the near-end microphone falls below the
specified threshold, and resumes when the threshold is
exceeded. AEC learning will resume when the input level
exceeds the specified threshold. The input signal level can be
checked visually via the (2) Mic In. meters.
4
Mic. Type Fixed, Moving Specifies the way in which the connected microphone will be
used. If the microphone is placed in a stand, for example, and
the distance between it and the speakers will not change
select “Fixed.” If the distance between the microphone and
speaker will vary, select “Moving.” Depending on the
environment, the “Moving” setting may result in optimum echo
cancellation effect even when the microphone is fixed and,
conversely, the “Fixed” setting can sometimes produce the
best results with a hand-held microphone. Set this parameter
for optimum results in your application.
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