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1. (WO2019024984) ACTIVE ROAD NOISE CONTROL
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CLAIMS:

1. An active road noise control system for a vehicle, the system comprising: a noise sensing microphone array configured to generate a multiplicity of noise sense signals representative of road noise originating from a road noise source in or at the vehicle, the noise sensing microphone array comprising a multiplicity of microphones disposed at a multiplicity of positions in or on the vehicle;

a beamformer configured to process the multiplicity of noise sense signals to generate a reference signal and to provide in connection with the noise sensing microphone array a sensitivity characteristic that comprises a main lobe directed to the road noise source;

an active road noise control filter configured to iteratively and adaptively process the reference signal to provide a noise reducing signal; and

a loudspeaker arrangement disposed in an interior of the vehicle and configured to generate, from the noise reducing signal, noise reducing sound at a listening position in the interior of the vehicle, the loudspeaker arrangement comprising one or more loudspeakers.

2. The system of claim 1, further comprising:

an error microphone arrangement configured to pick up sound at or close to the listening position and to provide an error signal representative of the picked-up sound; wherein

the error microphone arrangement comprises one or more microphones; and

the active road noise control filter is further configured to iteratively and adaptively process the reference signal and the error signal to provide the noise reducing signal.

3. The system of claim lor 2, further comprising:

a headrest disposed in the vicinity of the listening position; wherein

at least one of: one or more loudspeakers of the loudspeaker arrangement and one or more microphones of the error microphone arrangement are disposed at, on or in the headrest.

4. The system of any of claims 1-3, wherein the beamformer is configured to process the multiplicity of noise sense signals so that the sensitivity characteristic comprises at least one additional main lobe.

5. The system of any of claims 1-3, further comprising at least one additional beamformer, wherein the at least one additional beamformer is configured to provide in connection with the noise sensing microphone array at least one additional sensitivity characteristic that comprises a main lobe.

6. The system of any of claims 1-3, further comprising at least one additional noise sensing microphone array and at least one additional beamformer, wherein the at least one additional beamformer is configured to provide in connection with the at least one additional noise sensing microphone array at least one additional sensitivity characteristic that comprises a main lobe.

7. The system of any of claims 1-6, wherein the beamformer is a delay and sum beamformer.

8. An active road noise control method for a vehicle, the method comprising: picking up noise at a multiplicity of positions in or on the vehicle and generating a multiplicity of noise sense signals representative of road noise originating from a road noise source in or at the vehicle;

processing according to a beamforming scheme the multiplicity of noise sense signals to generate a reference signal and to provide a sensitivity characteristic for picking up the noise that comprises a main lobe directed to the road noise source;

iteratively and adaptively processing the reference signal to provide a noise reducing signal; and

generating at one or more positions in an interior of the vehicle, from the noise reducing signal, noise reducing sound at a listening position in the interior of the vehicle.

9. The method of claim 8, further comprising:

picking up sound at or close to the listening position and providing an error signal representative of the picked-up sound; wherein

the sound is picked up at one or more positions at or close to the listening position; and

the reference signal and the error signal are iteratively and adaptively processed to provide a noise reducing signal to provide the noise reducing signal.

10. The method of claim 8 or 9, wherein at least one of: generating, from the noise reducing signal, the noise reducing sound and picking up sound at or close to the listening position to provide the error signal takes place at, on or in a headrest disposed in the vicinity of the listening position.

11. The method of any of claims 8-10, further comprising processing the multiplicity of noise sense signals so that the sensitivity characteristic comprises at least one additional main lobe.

12. The method of any of claims 8-10, further comprising processing the multiplicity of noise sense signals representative of road noise occurring in or at a wheel of the vehicle to provide at least one additional sensitivity characteristic that comprises a main lobe.

13. The method of any of claims 8-10, further comprising:

picking up noise at a multiplicity of additional positions in or on the vehicle and generating a multiplicity of additional noise sense signals representative of road noise occurring in or at a wheel of the vehicle; and

processing according to an additional beamforming scheme the multiplicity of additional noise sense signals to generate an additional reference signal and to provide an additional sensitivity characteristic for picking up the noise that comprises a main lobe.

14. The method of any of claims 8-13, wherein the beamforming scheme is a delay and sum beamforming scheme.

15. A vehicle comprising an active road noise control system according to any of

claims 1-7.