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
Life of this patent
Estimating the term…
Abstract
An input is ciphered in at least one of a sector forming circuit 13, a scrambling circuit 14, a header appendage circuit an error correction encoding circuit 16, a modulation circuit 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.
Claims33
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 reproducing method comprising:
- a synchronization separation step for separating a synchronization signal from a digital signal read out from a data record medium;
- a demodulating step of demodulating the digital signal separated from the synchronization signal in accordance with a pre-set demodulation system;
- an error correction decoding step of error correcting and decoding the demodulated digital data;
- a sector resolving step of resolving the error corrected and decoded digital data into pre-set sectors;
- and
- a header separating step of separating a header part of a sector structure of the digital data resolved into sectors;
- wherein an input has been ciphered in a step for recording associated with at least one of the synchronization separation step, demodulating step, error correction decoding step, sector resolving step or the header separating step;
- and wherein
- the input is deciphered in a step for reproduction associated with the step for recording in which ciphering has been made at the time of recording.
A data reproducing method comprising:
- synchronization separation means for separating a synchronization signal from a digital signal read out from a data record medium;
- demodulating means for demodulating the digital signal outputted by the synchronization separation means in accordance with a pre-set demodulation system;
- error correction decoding means for error correcting and decoding the digital data outputted by the demodulating means;
- sector resolving means for resolving the digital data outputted by the error correction decoding means into pre-set sectors;
- and
- header separating means for separating a header part of a sector structure of the digital data outputted by the sector separation means;
- wherein an input has been ciphered in a step for recording associated with at least one of the synchronization separation means, demodulating means, error correction decoding means, sector resolving means and the header separating means;
- and wherein
- the input is deciphered by means for reproduction associated with the step for recording in which ciphering has been made at the time of recording.
A data recording method for error correction and encoding input digital data and recording the resulting data on a record medium, wherein at least part of data handled at the time of error correction and encoding and conforming to the key information for ciphering is processed with data conversion.
A data recording apparatus for error correction encoding input digital data and recording the resulting data on a record medium, comprising;
- input means for inputting the key information for ciphering;
- and
- means for data-converting at least part of data handled during the error correction and encoding responsive to the key information from said input means.
A data record medium having recorded thereon a signal obtained on converting at least part of data handled at the time of error correction and encoding of input digital data and which conforms to the key information for ciphering.
A method for reproducing a signal processed with error correction and encoding and recorded on a record medium, wherein
- at least part of data handled at the time of error correction and encoding and which conforms to the key information for ciphering is processed with data conversion, and wherein
- data handled at the time of error correction and decoding as a counterpart of the error correction and encoding and which conforms to the key information for ciphering is processed with data back-conversion as a counterpart of the data conversion.
An apparatus for reproducing a signal processed with error correction and encoding and recorded on a record medium, comprising:
- key information input means for inputting the key information for ciphering specifying data handled at the time of the error correction and encoding and which has been processed with data conversion;
- and
- error correction and decoding means for effecting error correction and decoding as a counterpart of the error correction and encoding, said error correction and decoding means performing error correction and decoding, as a counterpart operation with respect to said data conversion, on data from the key information input means conforming to the key information for ciphering.
A data recording method in which input data is processed with signal processing for recording and recorded in a pre-set recording area on a record medium, wherein
- the data is ciphered using the pre-set key information, and wherein
- the information recorded in an area other than a data recording area on said record medium is used as at least a part of the key information for ciphering.
A data recording apparatus in which input data is processed with signal processing for recording and recorded in a pre-set recording area on a record medium, wherein
- the data is ciphered using the pre-set key information, and wherein
- the information recorded in an area other than a data recording area on said record medium is used as at least a part of the key information for ciphering.
A data record medium on which data obtained on ciphering using the key information at least part of which is the information recorded in an area other than a data recording area is recorded in said data recording area.
A data reproducing method in which signal processing for reproduction is done on digital signals read out from a data recording area on a data record medium, said digital signals having been ciphered at the time of recording, wherein
- deciphering is done using the information recorded in an area other than a data recording area on said record medium as at least a part of the key information for ciphering.
A data reproducing apparatus in which signal processing for reproduction is done on digital signals read out from a data recording area on a data record medium, said digital signals having been ciphered at the time of recording, wherein
- deciphering is done using the information recorded in an area other than a data recording area on said record medium as at least a part of the key information for ciphering.
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 at least one of the initial value of the scrambling step or the generating polynominal is varied responsive to the 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 at least one of the pre-set value and the generating polynominal is varied responsive t the 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 preset 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.
A data record medium on which there is recorded a signal obtained on forming an input digital data into sectors in terms of a pre-set data volume asa unit, the data thus formed into sectors is processed with scrambling in which at least one of the initial value and the generating polynominal is changed responsive to the key information for ciphering, a header is appended to the resulting scrambled data, and the resulting data having the header is processed with error correction encoding and modulated in accordance with a pre-set modulation system..
A data reproducing method comprising;
- a synchronization separating step of separating a synchronization signal from a digital signal read out from a data record medium;
- a demodulating step of demodulating the digital signal separated from the synchronization signal in accordance with a pre-set modulation system;
- an error correction decoding step of error correcting and decoding digital data obtained on demodulation;
- a sector resolving step of resolving the error corrected and decoded digital data;
- a header separating step of separating a header portion of a sector structure of the digital data resolved into sectors;
- and
- a descrambling step of scrambling the digital data separated from the header by varying at least one of the initial value or the generating polynominal based on the key information used for recording.
A data reproducing apparatus comprising;
- synchronization separation means for separating a synchronization signal from a digital signal read from a record medium;
- demodulation means for demodulating the digital signal outputted by the synchronization separation means in accordance with a pre-set modulation system;
- error correction and decoding means for error correction and decoding digital data obtained by said demodulation means;
- sector resolving means for resolving the digital data outputted by said error correction and decoding means;
- header separating means for separating a header portion of a sector structure of the digital data outputted by said sector resolving means;
- and
- a descrambling step of scrambling the digital data outputted by said header separating means by varying at least one of the initial value or the generating polynominal based on the key information used for recording.
Dependencies are inferred from the claim text.