Data recording method and apparatus, data record medium and data reproducing method and apparatus
AssigneeSony Corporation
InventorsYoichiro Sako, Isao Kawashima, Akira Kurihara, Yoshitomo Osawa, Hideo Owa
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Abstract
An input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit 15, an error correction encoding circuit 16, a modulation circuit 18 and a synchronization appendage circuit 18, used for processing input data for forming a recording signal. Not only key for ciphering itself in the circuits but also the information as to which of the circuits has been used for ciphering becomes the key for ciphering. This realizes ciphering difficult to decode by a simplified structure.
Claims12
A data recording method comprising;
- a sector-forming step of dividing input digital data in terms of a pre-set data volume as a unit;
- a header appending step of appending header to the digital data divided into sectors;
- an error correction encoding step of appending an error correction code to the digital data having the header appended thereto;
- a modulating step of modulating the error-corrected encoded digital data in accordance with a pre-set modulation system;
- an synchronization appending step of appending a synchronization pattern to the modulated digital signal;
- and
- a recording step of recording the digital signal having the synchronization pattern appended thereto on a record medium;
- wherein
- an input is ciphered in at least one of the sector forming step, header appending step, error correction encoding step, modulation step and the synchronization appending step and the resulting ciphered data is outputted.
A data recording apparatus comprising;
- sector-forming means for dividing input digital data in terms of a pre-set data volume as a unit;
- header appending means for appending header to the digital data outputted by the sector forming means;
- error correction encoding means for appending an error correction code to the digital data outputted by the header appending means;
- modulating means for modulating the digital data outputted by the header appending means;
- synchronization appending means for appending a synchronization pattern to the digital signal outputted by the modulation means;
- and
- recording means for recording the digital signal outputted by the modulation means on a record medium;
- wherein
- at least one of the sector forming means, header appending means, error correction encoding means, modulation means and the synchronization appending means ciphers an input and outputs the resulting ciphered data.
A data record medium having recorded thereon data obtained by forming input digital data into sectors in terms of a pre-set data volume as a unit, appending a header to each sector, and by processing resulting data with header appendage, error correction and encoding, modulation in accordance with a pre-set modulation system and appendage of a synchronization pattern, the resulting processed data being then ciphered at the time of sector formation, header appendage, error correction and encoding, modulation or appendage of the synchronization pattern.
A data recording method comprising;
- a sector-forming step of dividing input digital data in terms of a pre-set data volume as a unit;
- a scrambling step for scrambling digital data divided into sectors;
- a header appending step of appending header to the scrambled digital data;
- an error correction encoding step of appending an error correction code to the digital data having the header appended thereto;
- a modulating step of modulating the error-corrected encoded digital data in accordance with a pre-set modulation system;
- an synchronization appending step of appending a synchronization pattern to the modulated digital signal;
- and
- a recording step of recording the digital signal to which has been appended the synchronization pattern;
- wherein an initial value of the scrambling step is varied responsive to key information for ciphering.
A data recording apparatus comprising;
- sector-forming means for dividing input digital data in terms of a pre-set data volume as a unit;
- scrambling means for processing digital data outputted from said sector forming means with scrambling in which a pre-set value is varied responsive to key information for ciphering;
- header appending means for appending header to the digital data outputted by said scrambling means;
- error correction encoding means for appending an error correction code to the digital data outputted by the scrambling means;
- modulating means for modulating the digital data outputted by the error correction encoding means in accordance with a pre-set modulation system;
- synchronization appending means for appending a synchronization pattern to the digital signal outputted by the modulation means;
- and
- recording means for recording the digital signal outputted by said synchronization appending means.
Dependencies are inferred from the claim text.