Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-06-26
1998-11-17
Neyzari, Ali
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
359 10, 365125, G11B 700
Patent
active
058386505
ABSTRACT:
Feedback is employed in a holographic memory system to facilitate rapid access to information in a stored data page. This feedback technique provides compensation for thermal, optical and/or mechanical variations in the system components that tend to interrupt the projection of a data page image on a sensor array. A page indicator or mark is stored in a holographic storage medium with a page of data such that, during playback, a quality, e.g., intensity, of its projected image is indicative of the quality of the corresponding projected data page image. A corresponding page indicator sensor is employed with the associated sensor array to detect the quality of a projected page indicator image. The projected data page image can then be read by sensor elements of the detector based on the detected quality of the page indicator image. Such a detector can be implemented in an active pixel sensor (APS) array with the page indicator sensor being implemented as a region of the APS array. Registration of the sensor array elements with respect to projected data pixels of the data page image can also be aligned to an absolute or substantially nearest pixel alignment by a similar feedback technique.
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Campbell Scott Patrick
Curtis Kevin Richard
Richardson Thomas J.
Harman John M.
Lucent Technologies - Inc.
Neyzari Ali
Rudnick Robert E.
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