User Guide

Audio concept

Audio hardware architecture

The functional core of the audio hardware is built around two ASICs: RAPGSM engine ASIC and the mixed-

signal ASIC Retu.

Retu provides an interface for the transducers and the accessory connector.

There are four audio transducers:

• Dynamic earpiece

• Dynamic speaker

• Microphone module

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

Figure 33 Audio block diagram

RM-164

System module

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