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8 Acoustic
The buzzer and the keypad clicks will be realized over the earpiece. At normal buzzer the signaling will
realized with swelling tones. At the same time a maximum sound pressure level in the coupler of 135 +/-
5dB(A) is fixed.
The standard sounds will be generated by the EGOLD+, the advanced sounds will be generated via
firmware running on the DSP.
8.1 Microphone
8.1.1
Mechanical
The microphone is built in the Mounting Frame Lower Part and is mechanically fixed with a rubber seal
(gasket). The contact on the PCB is realised via spiral springs, which are integrated in the gasket.
Because of usage of Unidirectional Microphone, the gasket has a front- and a back sound-inlet hole.
The front sound-inlet is acoustically tighten connected with a sound-inlet at the rear-side of the
mounting frame lower part. The back sound-inlet is acoustically tighten connected with a sound-inlet at
the bottom-side of the mounting frame lower part. The gasket of the microphone has a asymmetrical
shape in order to provide non-rotating, guaranteed covering of the sound-inlets of mounting frame lower
part to the corresponding sound-inlets at microphone gasket.
8.1.2
Electrical
Both Microphones are directly connected to the EGOLD+.(
MICN1,
MICP1
(Internal Microphone )and MICN2,
supply for the Microphone is
V 1.10
A52/A55/C55 IFX
VMIC
(EGOLD+.(
Analog Interface G1)
Page 42of 45
Company Confidential © Copyright Siemens AG
Analog Interface G2, F1-G3, H2
MICP2
(External Microphone/Headset). Power
)
) via the signals
ICM MP CCQ GRM
08/03
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