Static information storage and retrieval – Associative memories – Ferroelectric cell
Patent
1985-06-24
1987-10-20
Fears, Terrell W.
Static information storage and retrieval
Associative memories
Ferroelectric cell
365126, 365106, G11C 1300
Patent
active
047018798
ABSTRACT:
An associative (content addressable) optical memory system is comprised by a matched optical holographic filter (10, 18, 21, L1, L2) coupled to a digital computing system (14, 15, 16) having a memory (15, 16). In order to search the computing system memory for occurrences of an item, a hologram of a binary representation of the item is formed in the Fourier transform plane (18) employing laser (11) as the light source. A page of the memory to be searched is subsequently displayed at the input plane (10), which for example is comprised by a liquid crystal over silicon display, and illuminated by the laser (11). The light is filtered at the Fourier transform plane (18). Any occurrences in the input plane display of the item result in a respective correlation spot at the output plane, which spot output is decoded and supplied to the processor (14), thus providing correlation information to the computing system as to the location in its memory of the occurrences of the item.
REFERENCES:
patent: 3572881 (1971-03-01), Nishida
patent: 3841729 (1974-10-01), Ando et al.
Fears Terrell W.
Standard Telephones and Cables Public Limited Co.
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