Functions In The Audio Module (AUD)

The audio module (AUD) can run a number of different functions, but these functions can also be activated by other nodes. An example of these functions is lowering and increasing the volume. The signal comes from the infotainment control module (ICM), but it is the audio module (AUD) that actually changes the volume. The functions are described below.

Functions in the audio module (AUD): 

1. Adjustable volume  , raises and lowers the volume
2. Adjustable bass  , raises and lowers the bass level
3. Adjustable treble  , raises and lowers the treble level
4. System generated sound signals  , assists other nodes in the system with single sound signals generated in the control module, for example alarm signals for the reverse (reverse) warning function
5. Limiter  , the limiter function in the control module does not permit an increase in the power output level if this leads to a fall in sound quality
6. Mixing  , mixing allows numerous different sound types to be mixed. In this case, the different sound types are foreground noise, background noise and system generated sound signals. An example of this is where a CD is playing (background noise) and the carphone rings (foreground noise). The ringing signal will be heard through the loudspeakers while the volume of the music drops at the same time
7. Digital bass speaker output  , the control module transmits sound signals to the bass speakers via the MOST network. The signal is processed in the audio module (AUD) before it is transmitted on the MOST network to the subwoofer module (SUB)
8. Bass compensation  , the bass from the control module is compensated or modified depending on the volume level and the speed of the car. If the vehicle speed and volume level changes, the bass compensation is also changed
9. Treble compensation  , the treble in the control module is compensated or modified depending on how the volume is changed. If the volume changes, the treble compensation also changes
10. Equalizer setting, sound compensation  , there are different settings for the sound from the audio module (AUD). This compensates for factors such as the location of the loudspeakers and the layout of the car interior
11. Dolby ProLogic II  , a surround decoder for sound reproduction.

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

Foreground sound 

• telephone calls
• carphone settings (setting the ring signal)
• navigation
• system generated sound from the audio module (AUD) (different types of alarm sound)
• traffic messages.

Background sound 

• analogue radio, AM/FM
• digital radio, DAB
• CD player
• MD player.

The functions in the different versions of the audio module (AUD) are:

Performance 

1. adjustable volume
2. adjustable bass level
3. adjustable treble level
4. system generated sound signals
5. limiter.

High Performance 

1. adjustable volume
2. adjustable bass level
3. adjustable treble level
4. system generated sound signals
5. limiter
6. mixing
7. digital bass speaker output
8. bass compensation
9. treble compensation
10. equalizer.

Premium Sound 

1. adjustable volume
2. adjustable bass level
3. adjustable treble level
4. system generated sound signals
5. limiter
6. mixing
7. digital bass speaker output
8. bass compensation
9. treble compensation
10. equalizer
11. DPL2 - Dolby ProLogic II.