An automotive active brake noise damping system ( ABND) to actively damp braking noise perceivable in the passenger compartment of a motor vehicle comprising a braking system comprising a plurality of braking assemblies associated with wheels of the motor vehicle, the automotive active brake noise damping system ( ABNR) comprises: - a sensory system ( SENS) to sense quantities that allow the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking to be estimated, - an audio system to diffuse sounds in the passenger compartment of the motor vehicle, and - an electronic control unit connected to the sensory system (SENS) and the audio system, and programmed to control the audio system based on the quantities sensed by the sensory system (SENS) so as to actively damp the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking; the automotive active brake noise damping system ( ABND) wherein: - the sensory system ( SENS) comprises vibration sensors applied to the braking assemblies of the braking system of the motor vehicle to sense quantities indicative the vibrations generated by the braking assemblies of the braking system of the motor vehicle during braking; and in that the electronic control unit is characterised in being further programmed to: - store a mathematical model which correlates vibrations generated by the braking assemblies of the braking system of the motor vehicle during braking with corresponding braking noise perceived in the passenger compartment of the motor vehicle and produced by the braking assemblies of the braking system of the motor vehicle during braking; - estimate the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking as a function of the vibrations generated by the braking assemblies of the braking system of the motor vehicle during braking and sensed by the vibration sensors applied to the braking assemblies and of the stored mathematical model; - compute an interfering sound to be diffused in the passenger compartment of the motor vehicle so as to damp the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking, and - control the audio system to cause it to diffuse the computed interfering sound. - a sensory system ( SENS) to sense quantities that allow the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking to be estimated, - an audio system to diffuse sounds in the passenger compartment of the motor vehicle, and - an electronic control unit connected to the sensory system (SENS) and the audio system, and programmed to control the audio system based on the quantities sensed by the sensory system (SENS) so as to actively damp the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking; - the sensory system ( SENS) comprises vibration sensors applied to the braking assemblies of the braking system of the motor vehicle to sense quantities indicative the vibrations generated by the braking assemblies of the braking system of the motor vehicle during braking; - store a mathematical model which correlates vibrations generated by the braking assemblies of the braking system of the motor vehicle during braking with corresponding braking noise perceived in the passenger compartment of the motor vehicle and produced by the braking assemblies of the braking system of the motor vehicle during braking; - estimate the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking as a function of the vibrations generated by the braking assemblies of the braking system of the motor vehicle during braking and sensed by the vibration sensors applied to the braking assemblies and of the stored mathematical model; - compute an interfering sound to be diffused in the passenger compartment of the motor vehicle so as to damp the braking noise perceived in the passenger compartment of the motor vehicle and generated by the braking assemblies of the braking system of the motor vehicle during braking, and - control the audio system to cause it to diffuse the computed interfering sound.