Motor Vehicle Active Noise Reduction
AssigneeBose Corporation
InventorsDavis Y. Pan, Alaganandan Ganeshkumar
Life of this patent
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Abstract
A device and method that is configured to operate an active noise reduction system for a motor vehicle, where there is an active noise reduction system input signal that is related to the vehicle engine operation, and where the active noise reduction system comprises one or more adaptive filters that output noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise. The engine harmonic noise level is estimated from the input signal that is related to the vehicle engine operation, and the output of the transducers is limited based on the estimate of the engine harmonic noise level.
Claims18
A method for operating an active noise reduction system for a motor vehicle, where there is an active noise reduction system input signal that is related to the vehicle engine operation, and where the active noise reduction system comprises one or more adaptive filters that output noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, the method comprising:
- estimating the engine harmonic noise level from the input signal that is related to the vehicle engine operation;
- and
- limiting the output of the transducers based on the estimate of the engine harmonic noise level.
A method for operating an active noise reduction system for a motor vehicle, where an engine harmonic noise frequency is used as an active noise reduction system input signal, and where the active noise reduction system comprises a plurality of adaptive filters that output noise reduction signals that are used to drive a plurality of transducers with their outputs directed to reduce engine noise, and a computer memory that stores relationships between the transducer voltage level and the resulting engine noise level cancelled as a function of transducer output frequency, the method comprising:
- estimating the engine harmonic noise level from the input signal that is related to the vehicle engine operation;
- and
- limiting the output of the transducers based on the estimate of the engine harmonic noise level, where the output of the transducers is limited to a level that is calculated to cancel the engine harmonic noise, wherein the limiting step comprises determining the transducer voltage levels that are needed to cancel the estimated engine harmonic noise level at the input engine harmonic noise frequency.
A device configured to control the operation of an active noise reduction system for a motor vehicle, where there is an active noise reduction system input signal that is related to the vehicle engine operation, and where the active noise reduction system comprises one or more adaptive filters that output noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, the device comprising:
- a processor that is configured to:
- estimate the engine harmonic noise level from the input signal that is related to the vehicle engine operation;
- and
- limit the output of the transducers based on the estimate of the engine harmonic noise level.
A device configured to control the operation of an active noise reduction system for a motor vehicle, where an engine harmonic noise frequency is used as an active noise reduction system input signal, and where the active noise reduction system comprises a plurality of adaptive filters that output noise reduction signals that are used to drive a plurality of transducers with their outputs directed to reduce engine noise, and a computer memory that stores relationships between the transducer voltage levels and the resulting engine noise level cancelled as a function of transducer output frequency, the device comprising:
- a processor that is configured to:
- estimate the engine harmonic noise level from the input signal that is related to the vehicle engine operation;
- and
- limit the output of the transducers based on the estimate of the engine harmonic noise level, where the output of the transducers is limited to a level that is calculated to cancel the engine harmonic noise, wherein the limiting step comprises determining the transducer voltage levels that are needed to cancel the estimated engine harmonic noise level at the input engine harmonic noise frequency.
Dependencies are inferred from the claim text.