Engine Sound, Basic Function - GF82.60-P-9901A
Model all (CAR)
with code 97B (Engine noise reduction via speakers (EOC))
Model all (CAR)
with code B63 (Sporty engine sound)
Model all with engine 139
except code 97B (Engine noise reduction via speakers (EOC))
except code B63 (AMG eSound)
Overview
This document contains information on:
- Engine sound generation
- Engine noise reduction
General
The engine sound function fulfills one of the following two functions, depending on the equipment installed:
- Simulating engine and exhaust sounds in the vehicle interior
- Reducing engine noises in the vehicle interior
Function requirement
- Engine running.
Engine sound generation
The following signals define the current driving condition:
- Drive program/engaged drive range
- Vehicle speed
- Engine torque
- Engine speed
The sound system amplifier control unit or the multimedia system control generates a simulated engine sound on the basis of the driving condition. For some AMG engines, the sound system amplifier control unit reads in an additional sensor.
The speaker system outputs the simulated sound even when no audio source is active. If audio output is active, the simulated sound expands the current audio source.
Engine noise reduction
For the engine noise reduction function, additional microphones are integrated in the vehicle to measure the engine noises in the vehicle interior. Two microphones are located in the housings of the hands-free system microphones. Two further microphones are located in the area of the grab handles in the rear passenger compartment.
Engine noise reduction analyzes the signals of the microphones. Engine noise reduction calculates counter-signals (inverted signals) based on these signals in order to reduce audible, low-frequency engine noises in the vehicle interior at cylinder shutoff. Depending on the model, engine noise reduction is controlled by the sound system amplifier control unit.
The speaker system outputs the counter-signals even when no audio source is active. If audio output is active, the counter-signals expand the current audio source. The counter-signals overlay the engine noises in the vehicle interior and eliminate them almost entirely.
| Further basic function | |||
| Multimedia system control, basic function | GF82.85-P-9904A | ||
| Control units | |||
| Sound system amplifier control unit, basic function | Vehicles with sporty engine sound or engine noise reduction via speakers | GF82.62-P-9890A |