Audio Interface
32
C24 Module Hardware Description
December 15, 2008
Figure 2-21
illustrates the PCM bus format of the voiceband audio configuration.
Figure 2-21: Voiceband Mode PCM Bus Coding Format
Operating Modes
The C24 audio interface includes 2 modes of operation. Each operating mode defines the audio
input and output devices to be used for each audio sound type and their programmable settings.
Basic Mode
Basic mode is the C24 default power-up audio configuration. Several audio paths are available in
this mode, and their settings can be programmed through the AT command set.
Table 2-10
describes the available audio paths in Basic mode.
Advanced Mode
Advanced mode utilizes C24'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).
Table 2-10: 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 port.
Digital
PCM_DIN
PCM_DOUT
Enable digital path by
AT+MADIGITAL=1
Summary of Contents for 8900 - Blackberry Curve Cell Phone OEM Car Charger
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Page 30: ...Regulatory Approvals 6 C24 Module Hardware Description December 15 2008 ...
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Page 78: ...Application Interface Specifications 54 C24 Module Hardware Description December 15 2008 ...
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