Technical information

Chapter 2: Hardware Interface Description
November 15, 2008 G24-L Module Hardware Description 35
Figure 2-22 describes the audio programming interface options, which are defined by AT
commands.
Figure 2-22: Audio Programming Interface
Audio Algorithms
The G24-L audio interface features advanced speech processing algorithms for echo suppression,
noise suppression and side-tone feedback
Enabling or disabling the algorithms can be configured separately for each audio path and
operating mode through the AT command interface.
The G24-L also supports full rate (FR), half rate (HR), enhanced full rate (EFR) and adaptive
multi-rate (AMR) speech coding algorithms, which are used by the GSM network. These
algorithms are configured and operated by the GSM network provider.
Table 2-12 gives the speech processing features.
Table 2-12:
Speech Processing Features
Feature AT Command
Default
Setting
Description
Basic Advanced
Echo Suppression
ATS96 AT+MAFEAT Disabled
Controls the echo and noise suppres-
sion.
Noise Suppression
Sidetone ATS94 AT+MAFEAT Enabled Controls the sidetone.