Apparatus for reproducing data from optical data recording mediu

Details Apparatus for reproducing data from optical data recording mediu Apparatus for reproducing data from optical data recording mediu

1994-04-22

1995-05-30

Nguyen, Viet Q.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

3692753, 369 59, 235494, 235487, 235454, G06K 100, G11B 700

Patent

active

054208491

ABSTRACT:
An optical data reproducing apparatus detects a moving speed of an optical card and correct reproduced data in accordance with the detected speed in order to compensate for a speed variation of the optical card, Two read beams which are separated by a given distance in a track direction are irradiated to the card and are detected by two detectors, The moving speed is detected based on a difference between detection timings of the two detectors with regard to a given pit. In order to make pit-to-pit correspondence between the detection timings of the two detectors, a sync portion is first detected and the last pit in the sync portion is numbered the first pit and the difference between the detection timings of the same ordered pits is calculated to obtain the moving speed, The sync portion is recorded as a plurality of pits arranged at regular intervals, Intervals of the pits are detected and a ratio of the intervals detected is compared with a predetermined ratio for representing a sync pattern.

REFERENCES:
patent: 5091635 (1992-02-01), Akatsuka et al.

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