Internal Microphone; External Microphone - Nokia n80 User Manual

RM-91; RM-92
Nokia Customer Care System Module
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.
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