Apparatus and method for processing beam information using low density parity check code

An optical information recording method, which comprises the steps of:

• encoding data into a low density parity check code;
• representing the data, which is encoded into the low density parity check code, to a spatial light modulator in the unit of a data page;
• and
• modulating a recording beam into the data page representing the spatial light modulator to be recorded in form of hologram in a recording medium,
• wherein the data page includes a data block in which data, which is encoded into the low density parity check code, is mapped,
• wherein the data block is configured with a plurality of subblocks and a mark which is located at the center of the data block,
• wherein the mark is used as information to calculate reproduction probability of the data block which includes the subblocks.

An optical information reproducing apparatus, which comprises:

• a beam source;
• an optical information detecting portion for detecting the data page, which is reproduced from the recording medium by projecting the beam which is projected from the beam source to a recording medium;
• and
• a decoding portion for identifying an addressing block, detecting subblocks which are included in a data block and a mark which is located at the center of the data block from the plurality of data blocks which is included in the data page and decoding data of the subblock,
• wherein the mark includes information to calculate reproduction probability of the data block which includes the subblocks.

An optical information reproducing method, which comprises the steps of:

• detecting a data page which is reproduced from a recording medium by projecting beam which is projected from a light source to the recording medium;
• identifying an address block which is included in the data page;
• detecting a plurality of data blocks which are included in the data page, a mark which is located at the center of the data block and a plurality of subblocks which are located around the mark;
• and
• decoding data which is detected from the subblocks into a low density parity check code,
• wherein the mark includes information to calculate reproduction probability of the data block which includes the subblocks.

A device for processing of holographic data, which comprises:

• a decoding portion configured to process a data page, the data page including
• a plurality of data blocks;
• a mark which is denoted at the center of the data block and used for reproducing;
• and a plurality of subblocks which are denoted around the mark, wherein the mark includes information to enable the decoding portion to calculate reproduction probability of the data block which includes the subblocks.

A mapping method for mapping a data page to a light modulator for recording holographic data, which comprises the steps of:

• representing a data block by a mark, which is used for reproducing, and a plurality of subblocks, which is arranged around the mark;
• and
• representing the data page by the data block and the address block,
• wherein the mark includes information to calculate reproduction probability of the data block which includes the subblocks.

A decoding method of holographic data, which comprises the steps of

• demapping a data page, which includes an address block, a data block and a subblock including a mark, from an optical information detector array which detects a reproducing beam;
• and
• decoding the reproduced data from the data page into a low density parity check code,
• wherein the mark includes information to calculate reproduction probability of the data block which includes the subblock.

An optical information reproducing method comprising:

• detecting a plurality of subblocks and a mark in a data block reproduced from a recording medium;
• determining exact probability information based on the mark;
• determining inexact probability information based on the plurality of subblocks;
• and
• decoding data stored in the data block using the inexact probability information and the exact probability information.

An optical information recording method comprising:

• encoding data into a low density parity check code;
• dividing the low density parity check code into a plurality of areas;
• dividing each area of the plurality of areas into a plurality of segments;
• mapping the segments of the plurality of segments into subblocks of blocks in a data page, where the segments of an area of the plurality of areas are mapped into different blocks;
• and
• recording the mapped segments onto a recording medium.