Method and system to detect unwanted noise
AssigneeFord Global Technologies, LLC
InventorsDavid Zhou, Francois Charette, Keng D. Hsueh, Vy Tran, Hsiao-An Hsieh
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Abstract
An apparatus for detecting unwanted noise includes a reference sensor that generates a reference signal in response to stimulation by a source. A combined noise detector picks up a combined noise signal, which includes both background noise and the unwanted noise generated by the source. A noise separation synthesis device filters both signals to generate a coherent unwanted noise signal from the combined noise signal as a function of the reference signal generated by the reference sensor. A comparator determines the presence of unwanted noise by calculating the Kurtosis value of the coherent unwanted noise signal.
Claims21
An apparatus for detecting unwanted noise over background noise, said unwanted noise generated by at least one source, said apparatus comprising:
- a reference sensor coupled to said source, said reference sensor generating a reference signal in response to stimulation by said source;
- a combined noise detector located in proximity to said source and generating a combined signal, said combined signal comprising said background noise and said unwanted noise;
- a noise separation synthesis device coupled to said reference sensor and said noise detector, said noise separation synthesis device receiving said reference signal and said combined signal, said noise separation synthesis device filtering a coherent unwanted noise signal from said combined signal as a function of said reference signal;
- and
- a comparator coupled to said noise separation synthesis device and receiving said coherent unwanted noise signal, said comparator calculating a Kurtosis value to generate a squeak present signal above a predetermined Kurtosis level.
A sound detection system for detecting unwanted noise generated by at least one source over background noise, said system comprising:
- a vehicle;
- an apparatus for detecting unwanted noise located in said vehicle;
- a reference sensor coupled to said source, said reference sensor generating a reference signal in response to stimulation by said source;
- a combined noise detector located in proximity to said source and generating a combined signal, said combined signal comprising said background noise and said unwanted noise;
- a noise separation synthesis device coupled to said reference sensor and said noise detector, said noise separation synthesis device receiving said reference signal and said combined signal, said noise separation synthesis device filtering a coherent unwanted noise signal from said combined signal as a function of said reference signal;
- and
- a comparator coupled to said noise separation synthesis device and receiving said coherent unwanted noise signal, said comparator calculating a Kurtosis value to generate a squeak present signal above a predetermined Kurtosis level.
A method for detecting unwanted noise over background noise, said unwanted noise generated by at least one source, said method comprising the steps of:
- generating a reference signal in response to stimulation by said source;
- generating a combined noise signal, said combined noise signal comprising said background noise and said unwanted noise;
- receiving said reference signal and said combined noise signal;
- filtering a coherent unwanted noise signal from said combined noise signal as a function of said reference signal;
- receiving said coherent unwanted noise signal;
- calculating a Kurtosis value for said coherent unwanted noise signal;
- and
- generating a squeak present signal above a predetermined Kurtosis level.
Dependencies are inferred from the claim text.