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. 23, 1996
Filed:
Apr. 26, 1994
Applicant:
Inventors:
Thomas J Grycewicz, Belmont, MA (US);
Jehad Khoury, Arlington, MA (US);
Charles L Woods, Stow, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06E / ; G02B / ; G06F / ;
U.S. Cl.
CPC ...
364822 ; 359561 ; 382278 ;
Abstract
A joint transform correlator has modulators for temporally modulating a first optical input signal at a first frequency and a second optical input signal at a second frequency. An image sensor in the Fourier plane forms a product signal modulated by temporal sum and difference frequencies of the first and second frequencies. The product signal is thereafter demodulated at the temporal sum or difference frequency and the resulting optical signal is inverse Fourier transformed to recover the desired cross correlation signals.