Earpiece; Microphone - Nokia RH-47 Series Description

RH-47
7 - Baseband Description & Troubleshooting
Between UPP_WD2 and UEM the audio signals are transferred in digital format using
signals MICDATA and EARDATA. The headset output of UEM is also fed to boomer, that is,
the MALT speaker and the headset share the same output lines from UEM. Ringing tones
and warning/info tones are produced with the MALT speaker also.

Earpiece

The earpiece used in RH-47 is an 8-mm Pico earpiece. It has 32Ω continuous impedance
and continuous power 8 mWatt. It is driven by differential signals from the UEM (EARP &
EARN). It makes contact with the PWB via spring contacts.

Microphone

The microphone capsule for RH-47 is an EMC microphone
inal. Contacts are done by springs.
Two inputs are used from the UEM: one for the normal internal microphone and a second
for the headset. The third microphone input is not used, so it is connected to ground via
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Figure 4: RH-47 Audio Blocks
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has sensitivity of 42db nom-
. It
Issue 1 05/04