User guide

Chapter 15 – Audio Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 86
Echo Cancellation +ECHO
Description: This command is used to enable, disable or configure the Echo Cancellation functions for voice
calls (in rooms, in cars, etc.). The +SPEAKER function automatically sets echo cancellation
based upon audio path choice and this command allows non-standard operation.
Syntax: Command syntax: AT+ECHO= <mode>
Command Possible Responses
AT+ECHO?
Note: Read current settings
+ECHO: 0
OK
AT+ECHO=0
Note: Set Echo Cancellation Off
OK
AT+ECHO=1
Note: Set Echo Cancellation to Ear Seal
OK
AT+ECHO=2
Note: Set Echo Cancellation to Headset
OK
AT+ECHO=4
Note: Set Echo Cancellation to Handset
OK
AT+ECHO=5
Note: Set Echo Cancellation to Default Path
OK
AT+ECHO OK
Note Set to 5 (default)
AT+ECHO=?
Note: Test command
+ECHO: (0-5)
OK
Note: Possible values
Values: <mode>
0 Vocoder Echo Cancellation Off (default for Digital 1 path)
1 Ear Seal Echo Cancellation (default for Analog 1 path)
2 Head Set Echo Cancellation
3 Acoustic Echo Cancellation (AEC)
4 Speaker Echo Cancellation for car kit operation (default for Analog 2 path)
5 Default Echo Cancellation for current path settings (default)
If no argument is supplied to the command, the default value is assumed. The configuration is
saved immediately. See the Audio Overview section for more information.
Loudspeaker Volume Level +CLVL
Description: This command sets the loudspeaker volume level of the current audio path.
Syntax: Command Syntax: AT+CLVL=<Level>
Command Possible Responses
AT+CLVL OK
Note: Sets default value of 9
AT+CLVL=2 OK
Note: Command valid
AT+CLVL?
Note: Interrogate value
+CLVL: 2
OK
Note: Current value
AT+CLVL=?
Note: Test command
+CLVL: (0-12)
OK
Note: Possible values
Values: <Level>
0 -84dB (no output)
1 -32dB
2 -28dB
3 -24dB
4 -20dB