Playing Back Sound

Fig 1: View Of Audio Module (AUD) Components

Courtesy of VOLVO CARS CORPORATION

All functions in the audio module (AUD) (16/105) are controlled by the signals from other nodes in the MOST network.

To initiate audio playback, a control module transmits a request to the infotainment module (ICM) (3/281). The infotainment control module (ICM) allocates the request to the audio module (AUD) then the control module can transmit data via the MOST network to the audio module (AUD).

The infotainment control module (ICM) processes changes to the volume, balance, bass, treble and equalizer settings. The infotainment control module (ICM) transmits the changes via the MOST network to the audio module (AUD) which then carries out the changes.

The control modules on the MOST network which use the audio module (AUD) to play back sound are:

• integrated audio module (IAM) (16/1)
• phone module (PHM) (16/60), handsfree speaker sound
• Remote Digital Audio Receiver (RDAR) (16/145) (market-dependent)
• Digital Audio Broadcast Module (DABM) (16/162) (market-dependent)
• Television Module (TVM) (16/36)

When the audio module (AUD) has received optical signals on the MOST network, these signals are sent onwards as analog signals to the directly connected loudspeakers:

• loudspeaker left front (16/4, 16/29, 16/55)
• loudspeaker right front (16/3, 16/30, 16/56)
• loudspeaker left rear (16/6, 16/136)
• loudspeaker right rear (16/5, 16/137)
• Center loudspeaker (16/26) (option).
• subwoofer (16/79) (option) (only XC60).