Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2003-02-19
2008-03-04
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S094100, C381S094200, C381S111000, C381S094300, C381S312000, C381S317000
Reexamination Certificate
active
07340068
ABSTRACT:
A device for detecting the presence of wind noise in an array of microphones including two or more separate sound inlet openings, and a sound to electrical converting element or microphone in relation to each sound inlet opening. The microphones each generate time dependent signals which are fed to a signal processing device that provides one or more output signals. The signal processing device has means for generating a time dependent cross correlation function between a first and a second microphone signal, and means for generating a signal corresponding to a time dependent auto correlation function of either the first or the second of the microphone signals. Further, the signal processing device has means for comparing the values of the auto correlation function and the cross correlation function and the means for comparing are arranged to detect the condition that the auto correlation function is substantially higher than the cross correlation function, whereby the condition is indicative of the presence of wind noise.
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Bogason Gudmundur
Elmedyb Thomas Bo
Kjems Ulrik
Petersen Kim Spetzler
Dykema Gossett PLLC
Faulk Devona E.
Oticon A/S
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