| Description of dynamic noise compensation |
| The dynamic noise compensation uses the following values for the adjustment of the volume: |
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| Speed of fresh air blower |
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| Noises measured via a microphone unit in the roof module |
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| Volume normalisation in the MMI |
| The ABS control unit -J104- receives a speed signal from the front left speed sensor -G47- and the front right speed sensor -G45- in vehicles with front-wheel drive, and additionally from the rear right speed sensor -G44- and the rear left speed sensor -G46- in vehicles with four-wheel drive. The control unit then evaluates the signal and puts it on the instrument cluster/running gear CAN. |
| The Climatronic control unit -J255- puts the information on the activation of the fresh air blower -V2- on the convenience CAN. |
| The data bus diagnostic interface -J533- reads out this signal and transmits it across the fibre-optic MOST bus to the digital sound package control unit -J525-. |
| The background noises are picked up by the internal microphone -R74-, which is installed in the roof module and connected directly to the digital sound package control unit -J525-. |
| The level of noise compensation can be set via the multimedia system operating unit -E380-. The entry is evaluated by the control unit for front display and information control panel -J523- and transmitted via fibre-optic bus to the digital sound package control unit -J525-. |
| Using these values the digital sound package control unit -J525- adjusts the volume inside the vehicle. |
| The volume of quiet music will be increased to a higher degree than loud music. |
| The volume is always adjusted on the basis of the volume set by the listener, i.e. the volume level will never be lower than the level the listener has set. |
Note | If the basic or standard amplifier version is fitted, the digital sound package control unit -J525- is integrated in the radio -R-. |
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