Nokia Av Interface, Input - Nokia RX-44 Service Manual

RX-44
System Module
Figure 47 Nokia AV interface, output

Nokia AV interface, input

Traditional analog electret type of microphone is supported by the Nokia AV interface.
The microphone is biased by the 2.1Vdc from the D1420 asic. The weak analog audio signal got from the
microphone is fed to the N4100, amplified, AD converted and passed to the D400 for further usage via the
I2S interface.
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