Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-06-29
1996-05-14
Hindi, Nabil Z.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 58, 369 59, G11B 700
Patent
active
055174817
ABSTRACT:
An information recording medium on which digital information is recorded while the edge position of each pit on the recording medium is stepwise shifted from a predetermined reference position in accordance with a code being recorded within a predetermined shift period shorter than a transient period of a reproduced signal, and an information reproducing apparatus for reproducing the recorded information from the recording medium, includes clock generating element for generating a clock synchronized with a reference position in phase on the basis of a reproduced signal obtained from the optical detection system, level detection element for detecting the reproduction level within the transient period of the reproduced signal at a timing defined by the clock, first decoding element for decoding recording data corresponding to the shift amount of the edge position of an information pit, correction value generating element for storing predetermined correction values to correct errors in a decoding operation, and outputting a correction value in correspondence with the data decoded by said first decoding element, adding element for adding the correction value with the reproduction level of a target code to be decoded, and second decoding element for decoding the recording data corresponding to the shift amount of the edge position of the information pit on the basis of the output of the adding element.
REFERENCES:
patent: 4873680 (1989-10-01), Chung et al.
patent: 5345434 (1994-09-01), Ide et al.
patent: 5347505 (1994-09-01), Moritsugu et al.
patent: 5414689 (1995-05-01), Maeda et al.
patent: 5418770 (1995-05-01), Ide et al.
patent: 5422865 (1995-06-01), Katayama et al.
Hindi Nabil Z.
Shaw, Jr. Philip M.
Sony Corporation
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