Patent ID: 6650757
Filing Date: 2003-11-18
Classification: G01H,G01M

Abstract:
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.