Information recording and reproducing method
AssigneeHitachi, Ltd.
InventorsTakahiro Kurokawa, Harukazu Miyamoto, Hiroyuki Minemura
Life of this patent
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Abstract
Disclosed is a method for satisfying both high reliability and low error rate when in recording and reproducing information by making the average run length of the RLL code for recording a crystal state shorter than that for recording an amorphous state on a recording film, although the consistence of both high reliability and low error rate has been difficult in the case of conventional optical disks.
Claims10
An information recording method for retaining information at a boundary between first and second states formed on a recording film in accordance with the RLL coding rules, said first and second states being different from each other,
- wherein the average run length of said RLL code for recording said first state is shorter than that for recording said second state.
An information recording method for recording information on an information recording medium so that a state corresponding to data “1” and a state corresponding to data “0” are recorded as different physical states by means of the NRZ representation method,
- wherein the noise level differs between said state corresponding to “1” and said state corresponding to “0”;
- and
- wherein said state corresponding to “1” or said state corresponding to “0”, whichever is lower in said nose level, is recorded as said information with use of a modulation code capable of recording said information more on said information recording medium.
An information reproducing method for reproducing information from an information recording medium,
- wherein reproducing signals are obtained by irradiating a beam on said information recording medium on which said information is recorded and retained at each boundary between first and second states so that the average run length of the RLL code for recording said first state become shorter than that for recording said second state;
- and
- wherein said reproducing signals are decoded to digital information, thereby reproducing said information.
Dependencies are inferred from the claim text.