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US 7,366,071 B2Granted
Data recording method and device, data recording medium, data reproduction method and device
AssigneeSony Corporation
InventorsTakashi Kihara, Tatsuya Inokuchi, Yoichiro Sako
Life of this patent
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Abstract
The present invention provides a DSV normal controller and a DSV special controller. In only a predetermined region designated on an optical disc, the DSV special control is performed. The DSV special control causes the absolute value of the DSV to increase so that data will be prevented from being normally reproduced. The normal control causes the absolute value of the DSV to converge at 0. When data is reproduced from the optical disc, if the reproduction state of the predetermined region is abnormal, it is determined that the disc is an original disc. An encryption key can be recorded in the predetermined region.
Claims39
A data recording method, comprising:
- modulating input data for each of a predetermined unit;
- selecting predetermined connection bits that are placed between two sequences of modulated data, each sequence corresponding to the predetermined unit, causing the absolute value of a DSV to increase in only a predetermined region of a disc;
- recording the modulated data for each predetermined unit and the selected connection bits to the disc
- the disc having a recording area including a synchronous signal area and a data area, and said predetermined region is the data area;
- and
- determining if the disc is an original disc or a copied disc, the presence of the increased DSV in the region indicating that the disc is original, the absence of the increased DSV indicating that the disc is a copy of the original.
3 more elements
A data recording apparatus, comprising:
- modulating means for modulating input data for each predetermined unit and selecting predetermined connection bits placed between two sequences of modulated data, each sequence corresponding to the predetermined unit;
- recording means for recording the modulated data for each predetermined unit and the predetermined connection bits;
- and
- controlling means for causing the modulating means to select connection bits so that the absolute value of the DSV increases in a predetermined region of a disc so that the region is not reproduceable, the disc having a recording area including a synchronous signal area and a data area, and said predetermined region is the data area determining if the disc is an original disc or a copied disc, the presence of the increased DSV in the region indicating that the disc is original, the absence of the increased DSV indicating that the disc is a copy of the original.
1 more element
A recording medium, comprising:
- a plurality of predetermined units of modulated data and connection bits thereon recorded, the connection bits being placed between two sequences of modulated data, each sequence corresponding to the predetermined unit, the connection bits being recorded in a predetermined region of a disc, so that the absolute value of a DSV increases so that the region is not reproduceable, the disc having a recording area including a synchronous signal area and a data area, and said predetermined region is the data area, the presence of the increased DSV in the region indicating that the disc is original, the absence of the increased DSV indicating that the disc is a copy of the original.
A data reproducing method, comprising:
- reproducing data from a recording medium on which a plurality of predetermined units of modulated data and connection bits are recorded, the connection bits being placed between two sequences of modulated data, each sequences corresponding to the predetermined unit, the connection bits being recorded in a predetermined region of a disc, so that the absolute value of a DSV increases so that the region is not reproduceable the disc having a recording area including a synchronous signal area and a data area, and said predetermined region is the data area;
- detecting a reproduction state from the reproduced data;
- and
- determining if the disc is an original disc or a copied disc, the presence of the increased DSV in the region indicating that the disc is original, the absence of the increased DSV indicating that the disc is a copy of the original.
1 more element
A data reproducing apparatus, comprising:
- reproducing means for reproducing data from a recording medium on which a plurality of predetermined units of modulated data and connection bits are recorded, the connection bits being placed between two sequences of modulated data, each sequences corresponding to the predetermined unit, the connection bits being recorded in a predetermined region of a disc, so that the absolute value of a DSV increases so that the region is not reproduceable the disc having a recording area including a synchronous signal area and a data area, and said predetermined region is the data area;
- controlling means for causing the reproducing means to reproduce the predetermined region and detect a reproduction state of the reproduced data;
- and
- determining if the disc is an original disc or a copied disc, the presence of the increased DSV in the region indicating that the disc is original, the absence of the increased DSV indicating that the disc is a copy of the original.
1 more element
Dependencies are inferred from the claim text.