Chapter 2: Hardware Interface Description
January 1, 2006 Module Hardware Description 37
Table 2-11 describes the available audio paths in Basic mode.
Advanced Mode
Advanced audio mode utilizes G24's unique set of AT commands for advanced audio
programming. The expanded AT command set enables to define a specific audio path and setting,
which are not part of the default configuration, for each type of audio sound (speech, DTMF
tones, rings and alerts).
Unlike basic audio mode, which provides predefined audio paths, the advanced audio mode
provides full control over the G24 audio interface and its parameters, and differentiates between
each type of audio sound.
Table 2-12 describes the advanced mode audio programming features. These features are only a
part of the complete advanced audio AT command set.
Table 2-11:
Basic Mode Audio Paths
Audio Path Input Signal Output Signal Description
Handset MIC SPKR_N, SPKR_P Default audio path for speech and
DTMF tones.
Headset HDST_MIC SPKR_N, SPKR_P Alternate path for headset device.
Enable by setting HDST_INT_N
interface signal low.
Alert ALRT_N, ALRT_P Default alert and ringer loudspeaker
output device.
Digital PCM_DIN PCM_DOUT Enable digital path by
AT+MADIGITAL=1
Table 2-12: Advanced Mode Commands
Command Description
AT+MAPATH Sets the input device for voice, and the output
devices for voice, DTMF tones, rings and
alerts.
AT+MAFEAT Enables and disables the speech processing
algorithms - Echo suppression, noise sup-
pression and sidetone.
AT+MAVOL Sets the gain (amplification) level of the
selected analog output device.
AT+MMICG Sets the gain (amplification) level of the
selected analog input device.
AT+MADIGITAL Switches between analog and digital audio
paths.
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