Figure 99 Audio block diagram
Internal microphone
The internal microphone is used for HandPortable (HP) and Internal HandsFree (IHF) call modes.
An analogue electret microphone is connected to the EM ASIC (N2200) Mic1P and Mic1N inputs via asymmetric
electrical connection.
The microphone is biased by the EM ASIC MicB1 bias voltage output.
Figure 100 Internal microphone circuitry
External microphone
Galvanic accessories are connected to the system connector.
RM-91; RM-92
Nokia Customer Care System Module
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