Method and system for selecting sensor locations on a vehicle for active road noise control
AssigneeHarman Becker Automotive Systems GmbH
InventorNikos Zafeiropoulos
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Abstract
The present disclosure provides a method for determining an arrangement of reference sensors for active road noise control (ARNC) in a vehicle with an automatic calibration system. The method includes mounting a plurality of vibrational sensors on a plurality of structure elements of the vehicle to generate a plurality of vibrational input signals and mounting at least one microphone inside a cabin of the vehicle to capture at least one acoustic input signal. The method further includes determining an arrangement of reference sensors from the plurality of vibrational sensors by determining a subset of vibrational sensors which sense the main mechanical inputs of road noise contributing to the at least one acoustic input signal.
Claims17
A method for determining an arrangement of at least one reference sensor for active road noise control (ARNC) in a vehicle with an automatic calibration system, the method comprising:
- mounting a plurality of vibrational sensors of the automatic calibration system on a plurality of structure elements of the vehicle, the structure elements representing strongest contributions to a transfer of road noise into a cabin of the vehicle, and the vibrational sensors being configured to generate a plurality of vibrational input signals based on vibrations of the respective structure elements and to input the plurality of vibrational input signals to a processing unit of the automatic calibration system;
- mounting at least one microphone of the automatic calibration system inside the cabin of the vehicle, the at least one microphone being configured to capture at least one acoustic input signal and to input the captured at least one acoustic input signal to the processing unit;
- and
- determining the arrangement of the at least one reference sensor from the plurality of vibrational sensors with the processing unit by determining a subset of vibrational sensors which sense main mechanical inputs of road noise contributing to the at least one acoustic input signal;
- and
- wherein determining the arrangement of the at least one reference sensor includes:
- forming a plurality of proper subsets of vibrational input signals from the plurality of vibrational input signals;
- calculating a multiple-coherence function for each of the proper subsets of the vibrational input signals and for each of the at least one acoustic input signal using the processing unit to determine a coherence between the respective acoustic input signal and the vibrational input signals of the respective subset;
- and
- for each of the at least one acoustic input signal, automatically selecting with the processing unit, the proper subset based on the calculated multiple-coherence function as the arrangement of the at least one reference sensor for the ARNC of the at least one acoustic input signal.
An automatic calibration system for determining an arrangement of at least one reference sensor for active road noise control (ARNC) in a vehicle, the system comprising:
- a processing unit;
- a plurality of vibrational sensors mountable on a plurality of structure elements of the vehicle and configured to generate a plurality of vibrational input signals based on vibrations of the plurality of structure elements and to input the plurality of vibrational input signals to the processing unit;
- wherein the plurality of structure elements represent strongest contributions to a transfer of road noise into a cabin of the vehicle;
- and
- at least one microphone mountable inside the cabin of the vehicle and configured to capture at least one acoustic input signal and to input the captured at least one acoustic input signal to the processing unit;
- wherein the processing unit is configured to determine the arrangement of the at least one reference sensor from the plurality of vibrational sensors by determining a subset of vibrational sensors which sense main mechanical inputs of road noise contributing to the at least one acoustic input signal;
- and
- wherein the processing unit comprises:
- a multiple-coherence calculation unit configured to calculate a multiple-coherence function for each of a plurality of proper subsets of vibrational input signals formed from the plurality of vibrational input signals and for each of the at least one acoustic input signal to determine a coherence between the respective acoustic input signal and the vibrational input signals of the respective subset.
An automatic calibration system for determining an arrangement of at least reference sensor for active road noise control (ARNC) in a vehicle, the system comprising:
- a processing unit configured to receive a plurality of vibrational input signals;
- a plurality of vibrational sensors mountable on a plurality of structure elements of the vehicle and configured to generate the plurality of vibrational input signals based on vibrations of the plurality of structure elements;
- wherein the plurality of structure elements is indicative of contributions to a transfer of road noise into a cabin of the vehicle;
- and
- at least one microphone positioned within the cabin of the vehicle and configured to capture at least one acoustic input signal and to provide the captured at least one acoustic input signal to the processing unit;
- wherein the processing unit is configured to determine the arrangement of at least one reference sensor from the plurality of vibrational sensors by determining a subset of vibrational sensors which sense main mechanical inputs of road noise contributing to the at least one acoustic input signal;
- and
- wherein the processing unit comprises:
- a multiple-coherence calculation unit configured to calculate a multiple-coherence function for each of a plurality of proper subsets of vibrational input signals formed from the plurality of vibrational input signals and for each of the at least one acoustic input signal to determine a coherence between the respective acoustic input signal and the vibrational input signals of the respective subset.
Dependencies are inferred from the claim text.