Method and apparatus for recording and reproducing...

Details Method and apparatus for recording and reproducing... Method and apparatus for recording and reproducing...

2005-11-22

2009-10-06

Wellington, Andrea L (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Having specific code or form generation or regeneration...

C369S059110, C369S059180

Reexamination Certificate

active

07599272

ABSTRACT:
The present invention provides a multi-level information recording/reproducing method of recording or reproducing multi-level information by virtually setting cells at constant regular intervals on a track of an optical information medium where information is recorded or reproduced with a light spot and by varying an information pit width in a direction of the track or an information pit area, comprising the steps of: detecting a reproduced signal by radiating a light spot onto the track; detecting a cell border value by sampling the reproduced signal when the center of the light spot falls on a border between one cell and its following cell; and judging multi-level information of the following cell based on the cell border value.

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