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8.2 Earpiece/Loudspeaker
8.2.1
Mechanical
The speakermodule is designed to provide optimal performance for mobile handsfree and sound ringer.
Plus independent from mobile leakage sound performance. Therefore speakermodule is a system that
has a closed front volume with sound-outlets towards the ear of the user. Backvolume of
Speakermodule is using the unused air between the antenna and the PCB. Backvolume is just used for
resonance, there is no sound output from backvolume. The speakermodule is glued to the lightguide
and contacted via two bending springs to the PCB. The lightguide itself is screwed with six screws via
the PCB to the mounting frame lower part. Two of the six screws are located besides of the connection
of speakermodule and lightguide. Therefore a good and reliable connection between speakermodule
and PCB should be provided.
8.2.2
Electrical
The internal and external Loudspeaker (Earpiece) is connected to the voiceband part of the
(
) via audio amplifier inside the ASIC (D361). Input
Analog Interface B1, C1
for external loudspeaker
tones are generated with the loudspeaker too. To activate the ringer, the signal
EGOLD+ (
Miscellaneous,D16
EGOLD+
V 1.10
A52/A55/C55 IFX
AUDIO_L - AUDIO_R,
) is used
to ASIC
from Bright
IC
Page 43of 45
Company Confidential © Copyright Siemens AG
EPN1_FIL - EPP1_FIL.
for internal Loudspeaker
EGOLD+
Output
EPP! – EPN1.
The ringing
RINGIN
from the
ICM MP CCQ GRM
08/03
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