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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.

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