Motor vehicle adaptive feed-forward noise reduction
AssigneeBose Corporation
InventorDavis Y. Pan
Life of this patent
Estimating the term…
Abstract
A system, device and method that is configured to operate an active noise reduction system for a motor vehicle, where there is an adaptive feed-forward noise reduction system input sine wave at a frequency to be cancelled, and where the adaptive feed-forward noise reduction system includes an adaptive filter that outputs noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, and further includes an input transducer with an output signal that is a source of a control signal for the adaptive filter. The output signal of the input transducer is filtered before it reaches the adaptive filter so as to reduce the level of the output signal of the input transducer at one or more frequencies that are close to the frequency of the input sine wave.
Claims19
A method for operating an adaptive feed-forward noise reduction system for a motor vehicle, where there is an adaptive feed-forward noise reduction system input sine wave at a frequency to be cancelled, and where the adaptive feed-forward noise reduction system comprises an adaptive filter that outputs noise reduction signals that are used to drive one or more transducers with their outputs directed to reduce engine noise, and further comprises an input transducer with an output signal that is a source of a control signal for the adaptive filter, the method comprising filtering the output signal of the input transducer before it reaches the adaptive filter so as to reduce the level of the output signal of the input transducer at one or more frequencies that are adjacent to but not the same as the frequency of the input sine wave.
An adaptive feed-forward noise reduction system for a motor vehicle, where there are one or more transducers with their outputs directed to reduce engine noise and where there is an input sine wave at a frequency to be cancelled, the system comprising:
- an adaptive filter that outputs noise reduction signals that are used to drive the transducers;
- an input transducer with an output signal that is a source of a control signal for the adaptive filter;
- and
- an adaptive narrowband filter that filters the output signal of the input transducer before it reaches the adaptive filter so as to reduce the level of the output signal of the input transducer at one or more frequencies that are adjacent to but not the same as the frequency of the input sine wave.
Dependencies are inferred from the claim text.