Chapter 3: AT Commands Reference
April 15, 2008 G24-L AT Commands Reference Manual 3-169
+MAFEAT, Features Selection
This command controls the algorithm features: sidetone, echo cancel, noise suppression and
automatic gain control. Upon power up, the sidetone is enabled, and echo canceling, noise
suppression and automatic gain control are disabled.
The following table shows the +MAFEAT parameters.
Note: AGC - Automatic Gain Control is an electronic circuit that controls the gain of the
received signal in order to ensure adequate performance over a range of input signal
levels.
Command
Type Syntax Response/Action Remarks
Set
AT+MAFEAT=<feature>,
<state>
OK
or:
+CME ERROR: <err>
The Set command enables/disables
feature combinations.
Read
AT+MAFEAT? +MAFEAT:
<feature><state>,
[<CR><LF>+MAFEA
T: <feature><state>
[...]]
OK
or:
+CME ERROR: <err>
The Read command returns the
features state (enabled/disabled).
Test
AT+MAFEAT=? +MAFEAT: (<list of
supported <feature>s),
(<list of supported
<state>s)
OK
or:
+CME ERROR: <err>
The Test command returns the list of
supported features' numbers and
supported states (enable/disable).
Table 3-111: MAFEAT Parameters
<Parameter> Description
<feature> A number between 1 to 15 which is built from a combination of:
1 - Side tone
2 - Echo cancel
4 - Noise suppress
8 - AGC (Automatic gain control)
<state> 0 - Disable
1 - Enable
