Quectel GSM Series, Audio Design Manual

Page: 34 / 36

GSM/GPRS Modules
GSM Module Audio Design Guide
GSM Module Audo Design Guide Confidential/Release 33 / 35
AT+QAPS=1,4,0, "96.253.16388.31.57351.31.400.0.80.4325.99.0.20488.0.0.8192"
OK
//Write and save audio parameters of loudspeaker audio mode (software channel 2).
AT+QAPS=1,4,2, "254.224.3208.31.57351.24607.400.132.80.4325.99.0.16392.0.0.0"
OK
Quectel module has configured default parameters in software. For some special applications, such as
AIN1/AOUT1 being applied in hands-free, or echo issue caused by bad circuits or mechanical structure.
Some of parameters can be modified to fix echo issue. Advices of audio parameters in different
application are provided in the next section.
3.1.3.1. Description of Par0, Par2 and Par12
 Par0-
（
AEC
）
NLP control word
Value range: 0~256
Disable: 0
The large value has a positive effect on ECHO issue.
 Par2- （ AEC ） Echo suppressor control word
Value range: 32512~0
Disable: 32512
The smaller value has a positive effect on ECHO issue.
 Par12- AES Aggressive echo suppression
Value range: 32513~0
Disable: 32513
The smaller value has a positive effect on ECHO issue.
\
Par0, Par2, Par12 have the most significant effect on ECHO issue.
Note
Note
Quectel
Confidential