Optical data recorder with segment synchronization marks

Details Optical data recorder with segment synchronization marks Optical data recorder with segment synchronization marks

1992-12-22

1994-03-15

Hajec, Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 59, 369111, 3692753, G11B 390, G11B 2736, G11B 700, G11B 370

Patent

active

052951278

ABSTRACT:
The beginning of a segment within a track of a record carrier, having a plurality of frames in each segment, is identified by detecting the presence of a control mark at a given position near the beginning of a frame, and the absence of a control mark at an adjoining position at which a control mark will be found in all other frames of the segment. The other frames of each segment are free from a mark at the given position. The next bit position containing a mark, after the given position and its adjoining position, is the clock bit position used for bit clock synchronization. An apparatus for reading these marks may include a qualification circuit for evaluating the magnitude of the difference in detector output at the given bit position and the adjoining bit position.

REFERENCES:
patent: 4866686 (1989-09-01), Verboom
patent: 5126991 (1991-06-01), Verboom
patent: 5170385 (1992-12-01), Senshu et al.
Mass Format Technical Explanation, Apr. 29, 1991 from LMSI.

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