Functional Description; Audio External; Audio Internal; Earpiece - Nokia RH-18 Manual

CCS Technical Documentation

Functional Description

Audio External

Nokia 1100 is designed to support fully differential external audio accessory connection.
A headset and PnPHF can be directly connected to system connector.
2.7V
Hookint
/MBUS
EAD
Headint Headint
Mic_bias
MICB2
MIC2P
MIC2N
HF
3...25k
HFCM
UEM
Headset accessory uses 4-wire fully differential audio connection.

Audio Internal

Earpiece

The earpiece selected is a 13-mm dynamic earpiece with a nominal impedance of 32 Ω (.
The earpiece is placed within the mechanic parts, e.g. C-cover and Light guide. The holes
of the A-cover and the choice of dust shield are made in a way to have the best trans-
mission of the sound, without having much impact on the sound waves and sound qual-
ities.
The acoustic design involves a sandwich of five parts: Earmat, A-cover, C-cover, light-
guide- and D-cover.
On top of the lightguide there will be a metal frame (C-cover) that protects the earpiece.
The C-cover includes 5 acoustical holes and a double-sided gasket for sealing in the area
over the earpiece.
The front cover consists of two parts, an A-cover and an earmat with six acoustical holes,
2 direct front holes, and 4 leak holes.
Issue 1 10/03
Company confidential
Not all components are shown
1k0
2.1V
33N
33N
0.8V
0.8V
1k0
Figure 3: Headset Interface
Nokia Corporation.
1.8V
0.3V
RH-18/36/38
Engine module
Bottom
Connector
MicGnd
Page 19