Internal Microphone; External Microphone; Internal Earpiece; Internal Speaker (Ihf) - Nokia RM-164 Service Manual

RM-164
System module

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.
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