Control Module

Fig 1: Identifying Audio Module (Aud)

Courtesy of VOLVO CARS CORPORATION

The audio module (AUD) is an amplifier which is connected to the MOST network. It has the following functions:

• to carry the sound signal transmitted on the MOST network out to the directly connected loudspeakers and to the headsets as analogue signals
• to carry voice messages from the microphone, which is directly connected to the audio module (AUD), to the MOST network
• to transmit requests from the headset panel, which is directly connected to the audio module (AUD), to the relevant control modules on the MOST network to change to the next or the previous track or to change the sound source.

If a subwoofer module (SUB) is installed on the MOST network, the audio module (AUD) can process the incoming signal and transmit it to the subwoofer module (SUB).

There are three versions of the audio module (AUD):

Performance 

• Has an output of 25 W per channel. The control module has 4 channels, giving a total output of 100 W.

High Performance 

• Has an output of 40 W per channel. The control module has 4 channels, giving a total output of 160 W. There are two versions, one with four headset sockets and one without any headset sockets. These sockets can run headsets with a minimum impedance of 8 Ω.

Premium Sound 

• Has an output of 70 W per channel plus an output of 25 W for the channel for the centrally-mounted loudspeaker. The control module has four channels plus the channel for the centrally-mounted loudspeaker. This gives a total output of 305 W. The Premium Sound Audio Module (AUD) has four headset sockets. These sockets can run headsets with a minimum impedance of 8 Ω.

Each version of the audio module (AUD) has a different number of loudspeakers and different loudspeaker models.

All versions of the audio module (AUD) have a microphone input. This is used by the phone module (PHM) for phone calls (handsfree) for example.