Speaker system, basic function

Overview

This document contains the following information:

 Function of the speaker system

 Restricted speaker actuation

 Actuation of the speakers during an emergency call

 Communication support in the vehicle

General

The task of the speaker system is to output the audio information from various systems via the speakers in the vehicle.

Sources for the audio information can be the radio, media or the telephone, for example. Depending on the equipment installed, the speaker system is controlled either by the multimedia system control or by the sound system amplifier control unit.

Function of the speaker system

Each source converts the audio information into analog audio signals. Then an amplifier amplifies the analog audio signals and transmits them to the speakers. Depending on the equipment installed, the amplifier is either integrated in the multimedia system control or is installed in the vehicle as an independent control unit.

The subwoofer amplifier is optionally used. This additionally amplifies the analog audio signals to the rear subwoofer.

Each speaker is optimized for its tasks, e.g. according to the various frequency ranges. The speakers installed differ in terms of quality, number and installation location depending on the model and equipment level.

The user can adjust the volume and tone of the speaker system using the multimedia system. If an emergency call is triggered, the control unit for telematics services mutes the audio sources.

Restricted speaker actuation

During voice output, the amplifiers primarily actuate the speakers in the front area of the vehicle.

Actuation of the speakers during an emergency call

The center instrument panel speaker is connected directly to the control unit for telematics services for the emergency call system. This means that the function of the emergency call is assured independently of the speaker system.

The control unit for telematics services also sends a signal with the request for the mute function to the sound system amplifier control unit or to the multimedia system control.

Communication support in the vehicle

Depending on the vehicle model and its equipment, entertainment to all the seat rows can be made easier through acoustic support. To achieve this, the speaker system also outputs the words spoken in one seat row in the speakers assigned to the other seat row.

In the basic variant, the hands-free system microphones records what is spoken in the front seats and the speakers in the rear emit the signals too. This means that what is spoken in the first seat row can also be understood easier in the second seat row.

With the maximum equipment, additional microphones are fitted in the rear, so that communication between the seat rows can be supported in both directions by the speaker system.

The function is switched on and off using the multimedia system control. Different volume levels can also be selected to support communication.