Method and apparatus for recording and/or reproducing data on and/or from holographic storage medium
AssigneeSamsung Electronics Co., Ltd.
InventorsSung-hee Hwang, Jin-han Kim
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Abstract
A method and an apparatus for recording and/or reproducing data on/from a holographic storage medium, the method includes: calculating an on to off pixel ratio of the page; inverting data of the page according to the on to off pixel ratio to generate a page to be recorded; and recording the generated page.
Claims37
A method of recording data on a holographic storage medium on which holograms comprising the data are recorded as on-pixels and off-pixels in units of pages by using interference between signal and reference beams, the method comprising:
- calculating an on-to-off pixel ratio of the page;
- inverting data of the page depending on the on to off pixel ratio to generate a page to be recorded;
- and
- recording the generated page.
A method of reproducing data from a holographic storage medium on which holograms comprising the data are recorded in units of pages by using interference between signal and reference beams, the method comprising:
- reading a page from the holographic storage medium using the reference beam;
- decomposing the read page into page data and state information indicating whether one or more pixels of the page data has been inverted;
- and
- re-inverting the one or more inverted pixels of the page data based on the state information.
An apparatus for recording data on a holographic storage medium on which holograms comprising the data are recorded as on pixels and off pixels in units of pages by using interference between signal and reference beams, the method comprising:
- an optical processor recording the data on the holographic storage medium using the signal and reference beams;
- and
- a controller controlling the optical processor to invert data of a page according to an on to off pixel ratio of the page.
An apparatus for reproducing data from a holographic storage medium on which holograms comprising the data are recorded in units of pages by using interference between signal and reference beams, the apparatus comprising:
- an optical processor reading a page from the holographic storage medium using the reference beam;
- and
- a controller decomposing the page into page data and state information indicating whether the page data has been inverted and re-inverting the page data based on the state information.
A holographic storage medium comprising:
- holograms comprising data recorded in units of pages due to interference between signal and reference beams, and
- inverting data used by an apparatus reproducing the holographic storage medium to execute a method of reproducing the data from the holographic storage medium by detecting from the inverting data which portions of the data of at least one of the pages has been inverted when an on-to-off pixel ratio of the page exceeds a reference value and which portions are not inverted when the page was generated and recorded.
A method of recording and/or reproducing data on and reproducing the data from a holographic storage medium on which holograms comprising the data are recorded as on-pixels and off-pixels in pages by using interference between signal and reference beams, the method comprising:
- calculating an on-to-off pixel ratio of one of the pages;
- inverting the data of the page depending on the on-to-off pixel ratio to generate a page to be recorded;
- recording the generated page;
- reading the recorded generated page from the holographic storage medium using the reference beam;
- decomposing the read page into page data and state information indicating whether one or more pixels of the page data have been inverted;
- and
- re-inverting the one or more inverted pixels of the page data based on the state information.
Dependencies are inferred from the claim text.