Motorola AT Commands G24-L, Руководство разработчика

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Chapter 3: AT Commands Reference
April 15, 2008 G24-L AT Commands Reference Manual 3-155
Audio
Scope
The audio control can be summarized to the following three issues:
•
Path: Selection of microphone and speaker to be used.
•
Gain: Control of volume levels for rings, voice, etc.
•
Algorithm: Activation of audio algorithms (echo cancellation, noise suppression and
sidetone).
The G24-L incorporates two audio modes: 'Basic Audio' and 'Advanced Audio'. Each mode has a
different behavior and a set of relevant AT commands.
Figure 3-3 describes the two audio modes,
switching between them and the AT commands related to each mode.
Audio Control of Path, Gain and Algorithms is available by these two different modes' sets of
commands. It is advised to select the audio mode according to the application needs, either the
'Basic Audio' set or the 'Advanced Audio' set.
Basic Audio
This mode of commands suits most users. It provides a simple audio control. In this mode the
G24-L will also adjust the paths automatically upon headset interrupt. The G24-L powers up in
'Basic Audio' mode.
Basic audio specific commands are: +CRSL, +CLVL, +CMUT, S94, S96.
Advanced Audio
This mode suits users who require a full control of the audio. When using these advanced
commands, the audio control will ignore the headset interrupt (when the headset will be
connected the paths will not change automatically). Upon invoking, any of the advanced Audio
specific commands: +MAVOL, +MAPATH, +MAFEAT, +MAMUT, the G24-L enters 'Advanced
Audio' mode. G24-L remains in 'Advanced audio' mode until the next power up.
While in Advanced Mode, all Basic Audio AT commands (+CRSL, +CLVL, +CMUT, S94, S96)
are blocked and will return an error.
General Audio Commands
The following audio commands can be used in both Basic and Advanced audio modes:
+CRTT, +VTD, +VTS, +CALM, +MMICG, +MADIGITAL