Audio Module (AUD) [2012-2016]: Function

PLAYING BACK SOUND 

(Does not apply to S60 (11-), V60 & XC60 T6 4-cyl) 

Courtesy of VOLVO CARS CORPORATION

(Only S60 (11-), V60 & XC60 T6 4-cyl) 

Courtesy of VOLVO CARS CORPORATION

All functions in the Audio Control 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 Control Module (ICM) (3/281) or Infotainment Head Unit (IHU) (4/185). The Infotainment Head Unit (IHU) allocates the request to the Audio Control Module (AUD) then the control module can transmit data via the MOST network to the Audio Control Module (AUD).

The Infotainment Control Module (ICM) / Infotainment Head Unit (IHU) processes changes to the volume, balance, bass, treble and equalizer settings. The Infotainment Control Module (ICM) / Infotainment Head Unit (IHU) transmits the changes via the MOST network to the Audio Control Module (AUD) which then carries out the changes.

The control modules on the MOST network which use the Audio Control Module (AUD) to play back sound are:

• The Integrated Audio Module (IAM) (16/1) (Only on vehicles with Infotainment Control Module (ICM))
• 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)
• Rear seat entertainment module (RSE) (16/109) (only XC60)

When the Audio Control 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, V70 and XC70)

FUNCTIONS IN THE AUDIO CONTROL MODULE (AUD) 

1. Adjustable volume. 

   Raises or lowers volume.

2. Adjustable bass. 

   Raises or lowers bass sound.

3. Adjustable treble. 

   Raises or lowers treble sound.

4. Limiter. 

   The Limiter function used in the control module does not permit increase of the output if this results in reduced sound quality. In vehicles with double batteries the function limits the output when the engine is autostopped.

5. Mixing. 

   Mixing allows numerous different sound types to be mixed. In this case, the different sound types are foreground noise background noise. An example of this is where a CD is playing (background noise) and the reverse warning is activated (foreground noise). The reverse warning will be heard in the loudspeakers while the volume of the music drops at the same time

6. Bass compensation. 

   The bass from the control module is compensated/modified depending on the volume and the speed of the car. If the vehicle's speed and volume change, the bass compensation also changes.

7. Treble compensation. 

   The treble in the control module is compensated/modified depending on how the volume is changed. If the volume changes, the treble compensation also changes.

8. Equalizer setting, sound compensation. 

   Different audio settings can be made from the Audio Control Module (AUD). This compensates for factors such as the location of the speakers and the layout of the vehicle interior.

9. Dolby ProLogic II. 

   Surround decoder for playback of sound.

10. Dolby digital. 

    Surround decoder for playback of multi-channel sound.

11. Adjustable surround level. 

    Setting of volume for the different surround channels.

12. Soundstage. 

    Optimizing of sound for driver, front and rear seat.

13. Echofilter. 

    Prevents echoes in the handsfree speaker.

14. Center channel volume. 

    Raises or lowers the center channel volume.

15. Subwoofer volume. 

    Setting sound volume of subwoofer speakers.

There are two types of sound, foreground sound and background sound. The sounds which are foreground and background are listed below.

Foreground audio: 

• Navigation
• traffic messages
• Parking assistance

Background audio: 

• analog radio, AM/FM
• CD player
• DVD player
• USB
• AUX-input (3.5 mm)
• Media player, Bluetooth
• Active Noise Control (ANC) (only S60 (11-), V60 and XC60 T6 4-cyl)

The functions in the different versions of the Audio Control Module (AUD) are:

High Performance and High Performance Multimedia 

1. Adjustable volume
2. Adjustable bass level
3. Adjustable treble level
4. Limiter.
5. Mixing
6. Bass compensation
7. Treble compensation
8. Equalizer

Premium Sound Multimedia 

1. Adjustable volume
2. Adjustable bass level
3. Adjustable treble level
4. Limiter
5. Mixing
6. Bass compensation
7. Treble compensation
8. Equalizer
9. Dolby ProLogic II
10. Dolby digital
11. Adjustable surround level
12. Soundstage
13. Echofilter
14. Center channel volume

HEADPHONE PANEL (NOT ON S60 OR MODELS WITH MY 2014-). 

Courtesy of VOLVO CARS CORPORATION

The Audio Control Module (AUD) has two outputs for connecting headphones. Each separate headphone socket has controls for volume, next track, previous track, and source selection. A headphone socket enables rear seat passengers to connect their headphones and choose between different music sources, tracks, playlists and control their own volume.

Headphone panel not on vehicles with MY 2014 onwards.

ACTIVE NOISE CONTROL (ANC) (S60 (11-), V60 & XC60 T6 4-CYL) 

Courtesy of VOLVO CARS CORPORATION

Active noise control (ANC) is a function that is integrated in the Audio Control Module (AUD). Active noise control (ANC) consists of Engine Order Reduction (EOR), and Engine Order Enhancement (EOE).

Engine Order Reduction (EOR) 

A function that reduces unwanted noise inside the passenger compartment.

Low frequency noise that occurs at high engine load is reduced by anti-noise played from all loudspeakers in the passenger compartment.

The undesired noise is not eliminated completely but reduced to some extent.

Engine Order Enhancement (EOE) 

A function that strengthens and harmonizes electric and engine noise

An engine note similar to a 5 cylinder engine is played from the loudspeakers in the passenger compartment.

For the function (algorithm) to work the Audio Control Module (AUD) has two microphones and is connected to the HS-CAN.

The task of the microphones is to check the sounds produced. They are installed in the centre of the passenger compartment, one at the front and one at the rear.

The Audio Control Module (AUD) receives the following information via HS-CAN:

• Engine speed, torque and ratio from the Engine Control Module (ECM).
• Current gear position from the Transmission Control Module (TCM).
• Information about open windows or doors from the Driver Door Module (DDM), Passenger Door Module (PDM) and Central Electronic Module (CEM). If a window or door is opened or closed, the EOE function switches off.