The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2005
Filed:
Sep. 19, 2001
Joseph Alan Hogle, Roanoke, VA (US);
Michael Glynn Wise, Roanoke, VA (US);
Steven Mark Shaver, Rocky Mount, VA (US);
Michael Eugene Austin, Roanoke, VA (US);
Joseph Alan Hogle, Roanoke, VA (US);
Michael Glynn Wise, Roanoke, VA (US);
Steven Mark Shaver, Rocky Mount, VA (US);
Michael Eugene Austin, Roanoke, VA (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method for providing a corrective modulation signal to suppress an acoustic pressure wave in an operational system. The method includes sampling the acoustic pressure wave generated in the operational system; sampling a previously generated corrective modulation signal; performing fast Fourier transform processing on the sampled acoustic pressure wave; a pair of single frequency discrete Fourier transform processing is performed on the sampled acoustic pressure wave; determining the frequency, phase and magnitude of a dominate pressure wave in the acoustic pressure wave based on the fast Fourier and discrete Fourier transform processing; generating a sinusoidal corrective modulation signal to suppress the acoustic pressure wave based on the frequency, phase and magnitude of the dominate pressure wave and the parameters of the previously generated corrective modulation signal, the corrective modulation signal being at substantially the same frequency as, and generally 180 degrees out of phase with, the acoustic pressure wave.