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:
Sep. 13, 1988
Filed:
Apr. 30, 1986
Robert W Brandstetter, Levittown, NY (US);
Adrian R Doucette, Garden City, NY (US);
Grumman Aerospace Corporation, Bethpage, NY (US);
Abstract
Amplitude equalization of a distorted multifrequency signal is accomplished by acousto-modulating the signal with a coherent light beam and focusing a resultant image on a Fourier plane where the frequency components of the image are spatially distributed. A control array, positioned in the plane, contains adjacent elements having optical filtering properties variable with respect to each other thereby selectively altering the optical amplitude of each image frequency component passing through the elements. The resultant transformed image then undergoes conversion to an electrical signal having its amplitude equalized relative to the distorted input signal.