WO1988010497A3 - Hybrid optical and electronic associative memory - Google Patents

Hybrid optical and electronic associative memory

Info

Publication number
WO1988010497A3
WO1988010497A3 PCT/US1988/001473 US8801473W WO8810497A3 WO 1988010497 A3 WO1988010497 A3 WO 1988010497A3 US 8801473 W US8801473 W US 8801473W WO 8810497 A3 WO8810497 A3 WO 8810497A3
Authority
WO
WIPO (PCT)
Prior art keywords
electronic
associative memory
signal
image
hologram
Prior art date
Application number
PCT/US1988/001473
Other languages
French (fr)
Other versions
WO1988010497A2 (en
Inventor
Yuri Owechko
Original Assignee
Hughes Aircraft Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hughes Aircraft Co filed Critical Hughes Aircraft Co
Priority to DE8888904833T priority Critical patent/DE3870423D1/en
Publication of WO1988010497A2 publication Critical patent/WO1988010497A2/en
Publication of WO1988010497A3 publication Critical patent/WO1988010497A3/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C15/00—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores

Abstract

An associative memory system is provided which is a hybrid of optical and electronic components. In the preferred embodiment, a Fourier transform hologram is used to convolve a reference beam with correlated input images and stored object images. An electronic iteration loop is provided which is used to derive an enhanced reference beam for use in matching and enhancing the associative memory of the hologram with the object input plane image. The iteration loop of electronic components comprises a vidicon which receives the correlation plane image and provides that image in the form of an electronic signal to an electronic thresholding device or image processor. The image processor is capable of viewing the data at the rate of 30 frames per second and is used in the preferred embodiment to threshold the data with reference to the greatest amplitude portion of the correlation spot provided to the vidicon. After the electronic threshold has processed the signal, an improved signal is provided to the cathode ray tube screen. This processed signal is used to phase-modulate a projection light readout beam through use of a liquid crystal light valve. A polarizing beam splitter converts the phase modulation of the readout beam to an amplitude modulation wherein an enhanced reference beam is derived which is processed back to the hologram for readout at the output plane of the system. In this manner a variable-gain fast response electronic and optical component hybrid is provided for use as an associative memory.
PCT/US1988/001473 1987-06-19 1988-05-09 Hybrid optical and electronic associative memory WO1988010497A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8888904833T DE3870423D1 (en) 1987-06-19 1988-05-09 HYBRID, OPTICAL AND ELECTRONIC ASSOCIATIVE MEMORY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/064,901 US4837843A (en) 1987-06-19 1987-06-19 Hybrid optical and electronic associative memory
US064,901 1987-06-19

Publications (2)

Publication Number Publication Date
WO1988010497A2 WO1988010497A2 (en) 1988-12-29
WO1988010497A3 true WO1988010497A3 (en) 1989-01-26

Family

ID=22058976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/001473 WO1988010497A2 (en) 1987-06-19 1988-05-09 Hybrid optical and electronic associative memory

Country Status (5)

Country Link
US (1) US4837843A (en)
EP (1) EP0321512B1 (en)
JP (1) JPH02500700A (en)
DE (1) DE3870423D1 (en)
WO (1) WO1988010497A2 (en)

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US5262979A (en) * 1991-08-19 1993-11-16 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Optoelectronic associative memory
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US5361222A (en) * 1992-06-30 1994-11-01 The United States Of America As Represented By The Secretary Of The Air Force Binary phase only filter associative memory
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US5515498A (en) * 1993-10-01 1996-05-07 The Regents Of The University Of Colorado Optoelectronic computer graphics system and method
US5712912A (en) * 1995-07-28 1998-01-27 Mytec Technologies Inc. Method and apparatus for securely handling a personal identification number or cryptographic key using biometric techniques
US5680460A (en) * 1994-09-07 1997-10-21 Mytec Technologies, Inc. Biometric controlled key generation
US5541994A (en) * 1994-09-07 1996-07-30 Mytec Technologies Inc. Fingerprint controlled public key cryptographic system
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US5796858A (en) * 1996-05-10 1998-08-18 Digital Persona, Inc. Fingerprint sensing system using a sheet prism
US6016330A (en) * 1996-10-18 2000-01-18 International Business Machines Corporation Encoding and detection of balanced codes
US5896359A (en) * 1997-03-18 1999-04-20 Northrop Grumman Corporation Spinning disc volume holographic memory
US6125192A (en) 1997-04-21 2000-09-26 Digital Persona, Inc. Fingerprint recognition system
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US6005985A (en) * 1997-07-29 1999-12-21 Lockheed Martin Corporation Post-processing system for optical correlators
US6038332A (en) * 1997-09-05 2000-03-14 Digital Biometrics, Inc. Method and apparatus for capturing the image of a palm
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WO1987002505A2 (en) * 1985-10-11 1987-04-23 Hughes Aircraft Company Associative holographic memory apparatus employing phase conjugate mirrors

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WO1987002505A2 (en) * 1985-10-11 1987-04-23 Hughes Aircraft Company Associative holographic memory apparatus employing phase conjugate mirrors

Also Published As

Publication number Publication date
US4837843A (en) 1989-06-06
WO1988010497A2 (en) 1988-12-29
EP0321512A1 (en) 1989-06-28
EP0321512B1 (en) 1992-04-22
JPH02500700A (en) 1990-03-08
JPH0444358B2 (en) 1992-07-21
DE3870423D1 (en) 1992-05-27

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