User Guide

• 16mm dynamic speaker

• electret microphone module

In addition to the audio transducers, Retu also provides an output for the dynamic vibra component.

All galvanic audio accessories are connected to the Pop-Port

accessory connector.

A Bluetooth audio module BC02 that is connected to RAP3G supports Bluetooth audio functionality.

There is a separate application ASIC, Helen 2 (OMAP 1610) for Symbian applications.

Figure 104 Audio block diagram

Internal microphone

Internal microphone is used for HandPortable (HP) and Internal HandsFree (IHF) call modes.

An analogue electret microphone is connected to Retu ASIC’s Mic1P and Mic1N inputs via asymmetric electrical

connection.

The microphone is biased by Retu ASIC MicB1 bias voltage output.

RM-1

System Module Nokia Customer Care

Issue 1 Company Confidential Page 9–23