Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1983-01-03
1985-08-20
Richardson, Robert L.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
358213, 358342, G11B 700
Patent
active
045368660
ABSTRACT:
A system and apparatus is disclosed for retrieving analog or digital information stored on an optically sensed disc. In a preferred embodiment, a video disc is disposed between a flooding light source and a matrix array of photosensitive elements, there being provided optical focusing means so that the illuminated data tracks of the video disc are imaged onto the photosensitive array. Circuitry is provided for sensing output signals from selected elements of the array and in response thereto selecting those elements of the array onto which the selected track (or tracks) is best imaged. In this manner the apparatus of the present invention can provide data track following, conventional data retrieval and parallel simultaneous and sequential data retrieval. Alternative circuitry provides signal stream manipulation to compensate for fluctuations in rotational velocity of the data disc and to provide improved signal-to-noise ratios as well as frequency response enhancement. Other alternative circuitry permits compensation for lost data.
REFERENCES:
patent: 3158846 (1964-11-01), Silverman
patent: 3609373 (1971-09-01), Desai
patent: 3780266 (1973-12-01), Mudsam et al.
patent: 4003089 (1977-01-01), Mauer
Jerome Jonathan A.
Neu Frank D.
Wohlmut Peter G.
Richardson Robert L.
Videonics of Hawaii, Inc.
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