Figure 59 Audio block diagram
Internal microphone
Internal microphone is used for HandPortable (HP) and Internal HandsFree (IHF) call modes.
An analogue electret microphone is connected to Retu ASIC’s Mic1P and Mic1N is connected ground near Retu.
Figure 60 Internal microphone passive circuitry
RM-88
Nokia Customer Care System Module
Page 8 –18 COMPANY CONFIDENTIAL Issue 1
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