Back to results
US 5,295,127 AGranted
Optical data recorder with segment synchronization marks
AssigneeNorth American Philips Corporation
InventorsJohannes J. Verboom, Fred N. Wamble
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNorth American Philips Corporation
InventorsJohannes J. Verboom, Fred N. Wamble
Estimating the term…
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.
A method of reading recorded data from a record carrier, comprising the steps of:
An apparatus for reading data recorded on a record carrier in a pattern of marks arranged in parallel tracks, each track being divided into a plurality of segments, each segment being subdivided into a plurality of frames;
A record carrier having data recorded thereon in a pattern of marks arranged in parallel tracks, each track being divided into a plurality of segments, each segment being subdivided into a plurality of frames;
Dependencies are inferred from the claim text.