User's Manual
Table Of Contents
- Revision History
- 1 Regulatory Requirement
- 2 Hardware Interface Description
- 2.1 Operating Modes
- 2.2 Power Supply
- 2.3 Power On/Off Operation
- 2.4 Low Power Mode
- 2.5 Real Time Clock
- 2.6 Serial Interfaces
- 2.7 Removable-User Identify Module (R-UIM) Interface
- 2.8 Audio Interface
- 2.9 A/D Interface
- 2.10 Control and Indicators Interface
- 2.11 Antenna Interface
C24 Hardware Interface Manual
Version 0.3
TABLE 14 – Advanced mode commands
Command Description
Sets the input device for voice, and the output
AT+MAPATH
devices for voice, DTMF tones, rings and
alerts.
Enables and disables the speech processing
AT+MAFEAT
algorithms – Echo suppression, noise
suppression and sidetone.
Sets the gain (amplification) level of the
AT+MAVOL
selected analog output device.
Sets the gain (amplification) level of the
AT+MMICG
selected analog input device.
Switches between analog and digital audio
AT+MADIGITAL
paths.
2.8.8 Audio Programming Interface
The module incorporates an audio programming interface, through AT commands, which controls the
following audio features:
Audio Path – Defines the input and output devices for speech, DTMF tones, rings and alerts.
Audio Gain – Defines the amplification (gain) level for input and output audio devices.
Audio Algorithm – Defines the speech processing features for voice calls.
2.8.8.1 Audio Algorithms
The module’s audio interface support 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 module supports the following speech coding algorithms:
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