Playing Back Sound

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:

• multimedia module (MMM) (16/108) for voice guiding (navigation)
• integrated audio module (IAM) (16/1)
• phone module (PHM) (16/60), handsfree speaker sound
• Bluetooth phone module (BPM) (16/147), handsfree speaker sound

The audio module (AUD) can generate simple sound signals which are used for example to warn the driver and passengers if there are problems. These signals are transmitted from the infotainment control module (ICM) via the MOST network to the audio module (AUD).

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, 16/55)
• loudspeaker right front (16/3, 16/56)
• loudspeaker left rear (16/6, 16/136)
• loudspeaker right rear (16/5, 16/137)
• center loudspeaker (16/26) (option).

When sound compensation is required, the infotainment control module (ICM) transmits sound compensation signals via the MOST network to the audio module (AUD).