Internal microphone
Internal microphone is used for HandPortable (HP) and Internal HandsFree (IHF) call modes.
A digital microphone is connected to the RAPGSM’s (D2800) input GENIO71.
Figure 34 Digital internal microphone circuitry
External microphone
Galvanic accessories are connected to the system connector (Micro USB).
Accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated
phone accessories.
Internal earpiece
Internal earpiece is used for the HandPortable (HP) call mode. A dynamic earpiece capsule is connected to
Retu's differential output EarP and EarN.
Internal speaker (IHF)
The internal speaker is used for Internal handsfree (IHF) call mode, ringing tones, and listening to music files.
External earpiece
All galvanic accessories are connected to the system connector (Micro USB).
The accessory audio mode is automatically enabled/disabled during connection/disconnection of dedicated
phone accessories.
Vibra circuitry
Vibra is used for vibra-alarm function.
RM-164
System module
Issue 1
COMPANY CONFIDENTIAL
Page 5 –19
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