WO2006049029A1 - 光ディスク製造方法及び装置、光ディスク、並びに、光ディスク再生方法 - Google Patents
光ディスク製造方法及び装置、光ディスク、並びに、光ディスク再生方法 Download PDFInfo
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- WO2006049029A1 WO2006049029A1 PCT/JP2005/019521 JP2005019521W WO2006049029A1 WO 2006049029 A1 WO2006049029 A1 WO 2006049029A1 JP 2005019521 W JP2005019521 W JP 2005019521W WO 2006049029 A1 WO2006049029 A1 WO 2006049029A1
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- WIPO (PCT)
- Prior art keywords
- identification information
- modulation
- optical disc
- land
- bit
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
- G11B20/00115—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers wherein the record carrier stores a unique medium identifier
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1806—Pulse code modulation systems for audio signals
- G11B20/1809—Pulse code modulation systems for audio signals by interleaving
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/268—Post-production operations, e.g. initialising phase-change recording layers, checking for defects
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
- G11B2020/1453—17PP modulation, i.e. the parity preserving RLL(1,7) code with rate 2/3 used on Blu-Ray discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
- G11B2020/1469—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof modulation code with one or more merging bits between consecutive codewords
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2541—Blu-ray discs; Blue laser DVR discs
Definitions
- the present invention relates to a method and apparatus for manufacturing a read-only optical disc with additional identification information, a read-only optical disc with additional identification information, and playback of a read-only optical disc with additional identification information.
- the present invention relates to a method and an apparatus.
- Playback-only optical discs such as CD (Compact Disc) and DVD (Digital Versatile Disc) are widely known as information recording media capable of digitizing and recording copyrighted work information such as music and video.
- CD Compact Disc
- DVD Digital Versatile Disc
- Optical discs such as CDs and DVDs are recorded by forming a concave / convex pattern corresponding to the digital information of the copyrighted work on a disc-shaped substrate.
- Optical discs such as CDs and DVDs are recorded by forming a concave / convex pattern corresponding to the digital information of the copyrighted work on a disc-shaped substrate.
- it is possible to duplicate and sell a large amount of media on which the same information is recorded from the power of a single disc master.
- Post scribe ID is a mass production of optical discs such as CDs that use a material that melts with write-once light as a material for the reflective film that becomes the recording layer.
- the land which is a convex portion of a predetermined portion in the concave / convex pattern formed on the recording track, is irradiated with high-power laser light, and the land is formed into a concave portion, that is, a pit.
- this land can be made into a pit area in a plurality of predetermined parts on a read-only medium, and depending on the specific information of the medium, whether or not to leave the state of a force land to pit each part?
- irradiating each part with laser light it becomes possible to add identification information unique to the medium to the actual information recording part where the content is recorded.
- the portion where the land is pit must be a predetermined predetermined portion on the medium. If a data string that does not comply with the modulation rules is formed after the pits are recorded, the recording medium cannot be reproduced. Therefore, it is necessary to follow the modulation rules even after the pits have been landed.
- BD Blu-ray Disc
- next-generation recording medium for CDs and DVDs. It has been proposed.
- a recording method of identification information such as the above-mentioned post-scribe ID (trademark) in the case of reproduction only.
- BD uses the 17PP modulation system as the modulation system.
- the 17PP modulation method is a modulation method with a modulation unit of 2 bits.
- the BD format is configured so that one DC control bit is periodically inserted before the 17PP modulation.
- a recordable device based on the BD standard has also been released. Due to this situation, the following problems may occur when post-scribe ID recording is performed on a BD.
- the change may change only the DC control bit. Since the DC control bit is information that is discarded during the decoding process, it is impossible to detect whether post-scribe ID recording has been performed.
- the 17PP modulation method is a variable-length code whose modulation unit changes, when post-scribe ID recording is performed, where a part of the bit string is randomly recorded, the 17PP modulation rule is recorded before and after depending on the data. There is a high possibility that codewords not defined in the above will be generated. In such a case, depending on the design of the playback device, there is a possibility that the medium-specific information recorded as the postscribe ID cannot be read correctly.
- optical disc manufacturing is possible in which identification information is recorded on a reproduction-dedicated optical disc on which a bit string subjected to variable length modulation such as 17PP modulation is recorded, and identification management can be performed for each medium or each title. It is an object of the present invention to realize and provide a method and apparatus, an optical disc, and an optical disc reproduction method and apparatus with as few changes as possible applied to a conventional modulation circuit and demodulation circuit.
- recording is performed in units of clusters including an information bit string and an error correction code, lands and pits are continuously formed along a recording track, and the continuation of lands and pits is predetermined.
- An optical disc manufacturing method for manufacturing a read-only optical disc that complies with the rules of the variable length modulation method of the above-mentioned!
- additional disc-specific identification information is added to a specific cluster on the read-only optical disc.
- an information bit before variable length modulation in a specific cluster in which the identification information is additionally recorded is included.
- the above-mentioned read-only optical disk with a specific value for the column is manufactured, and in the identification information addition process, even if it is replaced with a pit, the land (specific land) at the position where the entire bit string conforms to the rules for variable length modulation is used. Therefore, the optical characteristics equivalent to those of the pits are achieved by the laser recording process.
- optical disc manufacturing method In the optical disc manufacturing method according to the present invention, recording is performed in units of clusters including an information bit string and an error correction code, lands and pits are continuously formed along a recording track, and the continuation of lands and pits is predetermined.
- the optical disk manufacturing method for manufacturing a read-only optical disk that complies with the rules of the variable length modulation method of the above, and a disk manufacturing process for manufacturing a read-only optical disk using an optical disk master, and larger than the playback power ⁇ Identification information that adds disc-specific identification information to a specific cluster on a read-only optical disc by performing additional laser processing that irradiates the land with power laser light and makes the land have the same optical characteristics as the pit.
- a continuous area corresponding to each bit of the identification information is set at a predetermined position in the cluster. Even if it is included in each continuous area, even if it is replaced by a pit, the entire bit string conforms to the variable length modulation rule, and the land (specific land) at the position where each bit of the identification information is Depending on the value, the optical characteristics equivalent to those of the pits are obtained by laser recording.
- the optical disc according to the present invention is recorded in cluster units including an information bit string and an error correction code, lands and pits are continuously formed along the recording track, and the continuation of lands and pits is continued.
- a specific cluster is irradiated with a laser beam having a power larger than the reproduction power.
- disc-specific identification information is added by a laser recording process that makes the land have the same optical characteristics as the pit, and even if the disc-specific identification information is replaced with a pit, the entire bit string is variable.
- the land (specific land) at a position that complies with the rules for long modulation is added by making the optical characteristics equivalent to the pits in the laser recording process, and the identification information is appended before the variable length modulation of the cluster.
- This information bit string is set to a specific value.
- the optical disc according to the present invention is recorded in cluster units including an information bit string and an error correction code, lands and pits are continuously formed along the recording track, and the continuation of lands and pits is continued.
- a specific cluster is irradiated with laser light having a power larger than the reproduction power, and the land has optical characteristics equivalent to pits.
- the disc-specific identification information is added by the laser recording process, and a continuous area corresponding to each bit of the identification information is set at a predetermined position in a specific cluster. Even if it is replaced, the value of the bit corresponding to the identification information is added to the land (specific land) where the entire bit string conforms to the variable length modulation rule. It has been recorded by the processing.
- the optical disc manufacturing apparatus performs recording in units of clusters including an information bit string and an error correction code, and lands and pits are continuously formed along a recording track.
- a laser beam having a power larger than the playback power is irradiated onto the land, and the land is equivalent to a pit.
- identification information recording means for adding identification information unique to the disk to a specific cluster on the reproduction-only optical disk.
- the information bit string before variable length modulation in the specific cluster in which the identification information is additionally recorded has a specific value. Even if this is replaced by a pit, the land (specific land) at the position where the entire bit string conforms to the variable-length modulation rule is made to have optical characteristics equivalent to those of the pit by the laser appending process.
- optical disc manufacturing apparatus In the optical disc manufacturing apparatus according to the present invention, recording is performed in units of clusters including an information bit string and an error correction code, and lands and pits are continuously formed along a recording track,
- An optical disk manufacturing apparatus that manufactures a playback-only optical disk in which the continuation of lands and pits conforms to the rules of the predetermined variable length modulation method, and irradiates the land with laser light having a power that is greater than the playback power.
- identification information recording means for adding disk-specific identification information to a specific cluster on a read-only optical disk.
- the means sets the continuous area corresponding to each bit of the identification information at a predetermined position in the cluster, and is included in each continuous area.
- the land (specific land) at a position that complies with the rules for long modulation is made to have the same optical characteristics as the pits by means of a laser recording process according to the value of each bit of the identification information.
- recording is performed in units of clusters including an information bit string and an error correction code, lands and pits are continuously formed along a recording track, and the continuation of lands and pits is predetermined.
- An information bit string generating step for generating a modulated bit string to be a land Z pit pattern of an optical disk, and a modulated bit string in accordance with an optical disk manufacturing method for manufacturing a read-only optical disk that complies with the rules of the variable length modulation method of By performing pattern inversion processing that inverts a given land into pits, an identification information addition process for adding identification information to a specific cluster on a read-only optical disk, and modulation after the identification information is added
- a master disc generation process for generating an optical disc master disc on which a subsequent bit string is recorded, and a read-only optical disc using the optical disc master disc.
- a read-only optical disk with a specific value for the information bit string before variable length modulation in the specific cluster to which the identification information is additionally written is prepared.
- recording is performed in units of clusters including an information bit string and an error correction code, lands and pits are continuously formed along a recording track, and the continuation of lands and pits is predetermined.
- An information bit string generating step for generating a modulated bit string to be a land Z pit pattern of an optical disk, and a modulated bit string in accordance with an optical disk manufacturing method for manufacturing a read-only optical disk that complies with the rules of the variable length modulation method of By performing pattern inversion processing that inverts a given land into pits,
- An identification information adding process for adding identification information to a specific cluster, a master generating process for generating an optical disk master in which a modulated bit string after the identification information is added, and playback using an optical disk master.
- a continuous area corresponding to each bit of the identification information is set at a predetermined position in the cluster and included in each continuous area. Even if it is replaced by a pit, the land (specific land) at the position where the entire bit string conforms to the variable length modulation rule is pitched by pattern inversion processing according to the value of each bit of the identification information.
- the optical disc according to the present invention is recorded in cluster units including an information bit string and an error correction code, lands and pits are continuously formed along the recording track, and the continuation of lands and pits is continued.
- a read-only optical disc that conforms to the rules of a predetermined variable length modulation system, a random / bit pattern and its error correction code are modulated into a specific cluster and a land / pit pattern is formed.
- Unique identification information is added, and even if the disc-specific identification information is replaced by an S pit, the land (specific land) at the position where the entire bit string conforms to the variable length modulation rule is converted into a pit.
- the information bit string before the variable length modulation of the cluster in which the identification information is additionally written is set to a specific value.
- the optical disc according to the present invention is recorded in cluster units including an information bit string and an error correction code, lands and pits are continuously formed along the recording track, and the continuation of lands and pits is continued.
- a read-only optical disc that conforms to the rules of a predetermined variable length modulation system, a random / bit pattern and its error correction code are modulated into a specific cluster and a land / pit pattern is formed.
- Unique identification information is added, and in a specific cluster, a continuous area corresponding to each bit of the identification information is set at a predetermined position, and even if it is replaced by a pit, the entire bit string
- the land (specific land) at the position that follows the variable length modulation rule is pitched according to the value of the corresponding bit of the identification information, and added It has been.
- the optical disc manufacturing apparatus performs recording in units of clusters including an information bit string and an error correction code, and lands and pits are continuously formed along a recording track.
- Read-only optical devices that comply with the This is a means for inputting a modulated bit string to be a land Z pit pattern of an optical disk and outputting a bit string to be recorded on an optical disc master, and entering a predetermined land of the modulated bit string.
- the optical disc manufacturing apparatus uses information bits to form pits by pattern reversal processing. And error correction codes are recorded in units of clusters, and lands and pits are continuously formed along the recording track, and the continuation of lands and pits conforms to the rules of the predetermined variable length modulation method.
- By performing pattern reversal processing for reversing predetermined lands into pits it has identification information additional means for adding identification information to a specific cluster on a read-only optical disk. A continuous area corresponding to each bit is set at a predetermined position in the cluster, and it is included in each continuous area, which is replaced with a pit. Even if it is, the land (specific land) at the position where the entire bit string conforms to the variable length modulation rule is made into a pitch by pattern inversion processing according to the value of each bit of the identification information.
- optical disk reproducing method In the optical disk reproducing method according to the present invention, recording is performed in cluster units including an information bit string and an error correction code, lands and pits are continuously formed along a recording track, and the continuation of lands and pits is predetermined.
- This is a read-only optical disk that complies with the rules of the variable length modulation method of the above, and after a land / pit pattern is formed by modulating an arbitrary information bit string and its error correction code in a specific cluster, Unique identification information is added, and even if the disc-specific identification information is replaced by a pit, the land (specific land) in the position where the entire bit string conforms to the above variable length modulation rules is used.
- the information bit string before the variable length modulation of the cluster in which the identification information is additionally recorded is set to a specific value, and this is an optical disk playback method for playing back a playback-only optical disk.
- Optical disc power The reproduced bit string is demodulated by the variable length modulation method, error correction processing is performed on the demodulated bit string, the cluster force identification information in which the identification information is added is detected, and the identification information is detected.
- the identification information is added without performing error correction processing, and the identification information is detected by comparing the demodulated information bit string with a specific value.
- recording is performed in cluster units including an information bit string and an error correction code, lands and pits are continuously formed along a recording track, and the continuation of lands and pits is predetermined.
- This is a read-only optical disk that complies with the rules of the variable length modulation method, and after a land / pit pattern is formed by modulating an arbitrary information bit string and its error correction code in a specific cluster, it is unique to the disk.
- Identification information is added, and a continuous area corresponding to each bit of the identification information is set at a predetermined position in a specific cluster, and even if it is replaced with a pit in the continuous area, the entire bit string has a variable length.
- the land (specific land) at the position that complies with the key rule is added by adding a pit according to the value of the corresponding bit in the identification information.
- An optical disk reproduction method for reproducing an existing optical disk in which a bit string reproduced from an optical disk is demodulated by a variable length modulation method, error correction processing is performed on the demodulated bit string, and a cluster camera in which identification information is additionally recorded.
- the identification information is detected, the error correction process is not performed when the identification information is detected, and the bit string of each continuous area in the cluster in which the identification information is added is extracted. The identification information is detected.
- the optical disk reproducing apparatus performs recording in cluster units including an information bit string and an error correction code, and lands and pits are continuously formed along a recording track.
- This is a read-only optical disk that complies with the rules of the variable length modulation method of the above, and after a land / pit pattern is formed by modulating an arbitrary information bit string and its error correction code in a specific cluster, Unique identification information is added, and even if the disc-specific identification information is replaced by a pit, the land (specific land) at the position where the entire bit string conforms to the variable length modulation rules is converted into a pit.
- the information bit string before the variable length modulation of the cluster in which the identification information is additionally recorded is set to a specific value, and is an optical disk playback device for playing back a playback-only optical disk.
- the demodulator that demodulates the bit string reproduced from the variable length modulation method, the error corrector that performs an error correction process on the bit string demodulated by the demodulator, and the identification information from the cluster card in which the identification information is added
- an error correction unit that does not perform an error correction process when the identification information is detected, and the identification information detection unit performs post-demodulation of the cluster in which the identification information is additionally recorded.
- the identification information is detected by comparing the information bit string with a specific value.
- the optical disk reproducing apparatus performs recording in cluster units including an information bit string and an error correction code, and lands and pits are continuously formed along a recording track.
- This is a read-only optical disk that complies with the rules of the variable length modulation method, and after a land / pit pattern is formed by modulating an arbitrary information bit string and its error correction code in a specific cluster, it is unique to the disk.
- Identification information is added, and a continuous area corresponding to each bit of the identification information is set at a predetermined position in a specific cluster, and even if it is replaced with a pit in the continuous area, the entire bit string has the above variable length.
- a land (specific land) at a position that complies with the modulation rules is added by adding a pit according to the value of the corresponding bit in the identification information.
- An optical disk reproducing apparatus for reproducing an optical disk, a demodulator that demodulates a bit string reproduced from the optical disk by the variable length modulation method, and an error correction process for the bit string demodulated by the demodulator.
- an identification information detection unit for detecting the identification information from the cluster camera to which the identification information is added.
- the error correction unit does not perform error correction processing when the identification information is detected.
- the identification information detection means detects the identification information by extracting a bit string of each continuous area in the cluster in which the identification information is additionally written.
- identification information can be recorded on a reproduction-only optical disc on which a bit string subjected to variable length modulation such as 17PP modulation is recorded, and identification management can be performed for each medium or each title.
- variable length modulation such as 17PP modulation
- FIG. 1A is a plan view showing an optical disc to which the present invention is applied
- FIG. 1B is a perspective view showing lands and pit patterns provided on the optical disc.
- FIG. 2A to FIG. 2C are cross-sectional views of an optical disc showing a land Z pit pattern before and after being melted by a laser beam.
- FIGS. 3A to 3C are cross-sectional views of an optical disc showing other land Z-pit patterns before and after being melted by a laser beam.
- FIG. 4 is a diagram showing a data format with an error detection code (EDC) added.
- EDC error detection code
- FIG. 5 is a diagram showing a data format with an error correction code (ECC) added.
- ECC error correction code
- FIG. 6 is a diagram showing a BIS format.
- FIG. 7 is a diagram showing the relationship between physical clusters and linking areas.
- FIG. 8 is a diagram showing a data structure of an address unit.
- FIG. 9 is a diagram showing the structure of a data frame.
- FIG. 10 is a diagram showing a data configuration of a physical cluster.
- FIG. 11 is a diagram showing a conversion table for 17PP modulation.
- FIG. 12 is a diagram showing a frame sync bit pattern.
- FIG. 13A to FIG. 13E are diagrams showing a format of a unique ID.
- FIG. 14 is a diagram showing a write position on a physical cluster with a unique ID.
- FIG. 15 is a diagram showing a recording area of a unique ID in a data frame.
- FIG. 16A and FIG. 16B are diagrams showing a write area in a data frame in the case of bit content power O and 1 respectively.
- Figure 17 shows the logical block that contains the first bit (b) of the unique ID unit (394 bits).
- FIG. 18 is a diagram showing byte positions on the logical block including the second bit (b) of the unique ID unit (394 bits).
- FIG. 19 is a diagram showing byte positions on the logical block of each bit of the unique ID unit (394 bits).
- FIG. 20 is a diagram showing a physical frame in a case where a continuous area does not exist in an area following the frame sync.
- FIG. 21 is a diagram showing a physical frame in which a continuous region is provided avoiding EDC.
- FIG. 22 is a diagram showing a flow of an optical disc manufacturing process when a unique ID is recorded by a laser recording process.
- FIG. 23 is a diagram showing a block configuration of the UID writing device.
- FIG. 24 is a diagram showing a flow of an optical disc manufacturing process in the case of recording a unique ID by pattern inversion processing.
- FIG. 25 is a block circuit diagram showing a block configuration of an optical disk reproducing device.
- FIG. 26 is a diagram showing the number of errors that occur in the physical frame when comparing the number of errors and determining the bit value.
- FIG. 27 is a flowchart showing a processing procedure for comparing the number of errors and determining the bit value.
- FIG. 28 is a diagram for explaining a first modification in which PID is recorded while avoiding a DC control code.
- FIG. 29 is a diagram for explaining a case where the first bit of a 4-byte continuous area is turned into a pit in another example of the present invention.
- FIG. 30 is a diagram for explaining a case where the first bit of a 4-byte continuous area is turned into a pit in another example of the present invention.
- FIG. 31 is a diagram for explaining a case where the first bit of a 4-byte continuous area is pitched in another example of the second modification of the present invention.
- FIG. 32 is a diagram for explaining a case where the first bit of a 4-byte continuous area is turned into a pit in another example of the present invention.
- FIGS. 33A and 33B are views showing positions where pits are formed in a land of a continuous area of 4 bytes in another example of the present invention.
- the optical disc 1 is an optical disc called a BD (Blu-ray Dis BD disc), and is a read-only optical disc in which data cannot be written by the user among such BDs.
- the optical disc 1 has a radius R of about 60 mm and a disc thickness d of about 12 mm.
- the light beam used for reproduction is an optical beam having a wavelength of 405 nm, and so-called blue-violet laser light is used.
- the numerical aperture NA of the objective lens is 0.85.
- a signal is written by forming a concave portion 4 along a recording track on a bottom surface portion 3 which is a reflective surface of the disc.
- a concavo-convex pattern sequence corresponding to a bit string of data to be recorded is formed on the recording track.
- the concave portion 4 formed on the bottom surface 3 of the recording track is hereinafter referred to as “pit”, and the bottom surface 3 other than the pit on the bottom surface of the recording track is hereinafter referred to as “land” t.
- the reflective film 6 is irradiated with a laser beam having a normal reproduction level power, the material properties do not change at all. However, when it is irradiated with laser light whose output is sufficiently higher than the playback level, it melts and becomes a material that has the same partial force S-pit reflection characteristics. In other words, the land is made of a material that can be regarded as a pit when irradiated with high-power laser light.
- the reflective layer is made of aluminum.
- the reflective layer is made of an alloy of aluminum and titanium, an alloy in which aluminum and another element are mixed, an alloy containing silver, or the like. It is configured.
- a pattern of unevenness is transferred to a substrate such as polycarbonate or acrylic by a stamper or the like, and a land Z-pit pattern corresponding to content data is recorded on a recording track.
- the optical disc 1 has identification information unique to each disc in the recording track after the concavo-convex pattern provided in advance on the stamper used when manufacturing the disc 1 is transferred. (Hereinafter, also referred to as “unique ID” or “UID”) is recorded in addition to each sheet.
- the unique ID additional recording method is a laser irradiation process in which a land at a predetermined position in the recording track of the disc is irradiated with a high-power laser to perform recording by pitting the land. is there. In other words, an area where the land can be pitched is provided in a plurality of predetermined parts on the recording area, and the state of the force land that pits each part is left in accordance with the bit information of the unique ID. The laser light is irradiated to each part.
- a high-power laser L is irradiated onto a land Ra at a predetermined position as shown in FIGS. 2B and 3B.
- the high-power laser L is sufficiently higher than the regenerative power and power enough to melt the land Ra.
- the reflection film 6 applied to the land Ra is not melted.
- the reflected light does not return. In other words, this part has the same reflection characteristics as the pit Pi.
- the unique ID is additionally written by pitting the land Ra.
- the optical disc 1 is a read-only optical disc, it is possible to record unique identification information for each disc.
- BCA Band Cut Area
- a method for recording identification information unique to each disk in order to read and write without tracking control, it is required to blow a 800-micron wide reflective film in the radial direction to record 1-bit information.
- 1-bit information can be recorded by blowing off a reflective film having a width smaller than 1 track width (0.32 microns) by performing tracking control and irradiating laser light. Is possible.
- the width required to record 1-bit information is compared with BCA using this method, it is 800 vs. 0.3. In other words, this method is more than 1000 times longer than BCA, and the length to blow off the reflective film is small.
- the laser power and recording time required for recording in this method can be realized to be overwhelmingly smaller than BCA. Also, since BCA cannot track, it is possible to determine which part of 800 microns is being read. Can not ,. For this reason, it was necessary to check the entire recording area of 800 microns in the disk shipment inspection, which had the problem of poor efficiency. On the other hand, this method can be recorded and played back while keeping tracking, so that it can be surely inspected at the time of disk shipment. Details on the format of the unique ID, the location on the disc where the unique ID is added, and the method for reproducing the unique ID will be described later.
- the optical disc 1 is managed according to a predetermined format.
- the user information is subjected to an error correction code using a Reed-Solomon code using a long distance code in a predetermined block unit.
- optical disc 1 the entire file data, music, and video content data (user data) recorded on optical disc 1 is divided into data groups of 64 kbytes, and each divided data group of 64 kbytes is divided.
- An error detection code (EDC) and error correction code (ECC) are added to form a basic unit of data called one ECC cluster.
- the specific configuration of the ECC cluster is as follows.
- the 64-kbyte data group is subdivided into 32 data groups.
- a 4-byte error detection code (EDC) is added to each 2048-byte data group (user data) to make a total data group of 2052 bytes.
- EDC error detection code
- predetermined scrambling is performed in units of 32 2052 byte data groups, and the 32 data groups are combined again and returned to the original data group (32 ⁇ 2052 byte) units.
- the scrambled 32 X 2052 byte data group is blocked into 304 byte string X 216 lines as shown in Fig. 5, and then 204 byte string X 32 line error correction code (E CC) Is added.
- the error correction code is a Reed'Solomon code.
- the ECC cluster is completed by rearranging the 248 rows by 204 bytes with a predetermined interleaving.
- a BIS cluster is a data unit in which an ECC cluster number called an address, a block number in the ECC cluster, and a number representing a function of information recorded in the ECC cluster called a user control are recorded.
- the specific configuration of the BIS cluster is as follows.
- an address composed of 4-byte information indicating an address number, 1-byte information as additional data, and an error correction code using a 4-byte Reed-Solomon code is formed.
- a 32-byte error correction code is added to each 30-byte data group, and finally, a predetermined interleaving is performed and rearranged to complete the BIS cluster.
- the physical layer of optical disc 1 connects these physical clusters with the physical clusters on which data obtained by combining ECC clusters and BIS clusters is recorded.
- an ECC cluster (304 bytes x (216 rows + 32 rows))
- each physical cluster is divided into 16 blocks called address units, and each address unit is further divided into 31 data frames.
- the linking part consists of two data frames.
- Data in the data frame is the information for the 39 knot, 78 knot and 117 knot 3 knot BIS clusters, and the remaining 152 bytes are the ECC cluster information.
- the physical cluster as described above is a physical cluster as shown in FIG. 10 in which a frame sync that is a synchronous data pattern representing the head of the data frame is attached to the head of each data frame.
- a physical cluster is subjected to 17PP modulation and NRZI conversion for each data frame including a frame sync, and becomes a recording pattern of a predetermined address of the optical disc 1.
- the ECC cluster and BIS cluster are rearranged so that the error correction code (ECC) is always located after the physical cluster.
- FIG. 11 shows a conversion table for 17PP modulation.
- the bit string indicated as “data bits” is the bit string before modulation, and the bit string indicated as “modulation bits” is the bit string after modulation.
- "XX” in the conversion table shown in Fig. 11 means that any value of X force O force 1 is taken.
- (_fs) in Fig. 11 represents the bit string of the frame sync.
- FIG. 12 shows the frame sync. # In Fig. 12 becomes 1 only when the bit string before modulation before this frame sync is "00" or "0000", and 0 otherwise.
- the 17PP modulation of BD is a variable-length modulation method, that is, a modulation method in which the bit length as a conversion unit changes.
- the run length code is 1 in which the continuous length of “1” after modulation is 1 and the continuous length of 0 is 8 or less, and “1” before conversion for each modulation unit. Match the odds of the number of 1 and the number of 1 after conversion!
- bit string before modulation is converted into a 3Z2 times bit string.
- a unique ID is generated for each disc, formatted in a predetermined format, and recorded on disc 1.
- a 1-byte data block number is added to the head of the 160-byte data block.
- the data block number is a number assigned to each data block.
- dummy data 51 bytes are added in front of the data block number, and a 4-byte error detection code (EDC) is added after the 160-byte data block, resulting in a total of 216 bytes of data.
- EDC error detection code
- the 51 bytes of dummy data are all "FF" data.
- ECC error correction code
- the unique ID is a laser that irradiates a land at a predetermined position in the recording track of a specific physical cluster with a high-power laser after transferring the pattern of the pit Z land with a stamper in the normal format. By performing the appending process, the land is pitted and recorded.
- the recording format of the unique ID is as follows.
- a data group of 197 bytes (157 bits) is divided into four as shown in FIG. 13E, and is divided into unique ID units every 394 bits.
- One unique ID unit (394 bits) is recorded in one physical cluster.
- the physical cluster in which the unique ID unit (394 bits) is recorded is a specific physical cluster on the optical disk 1.
- the address of the physical cluster to which the unique ID is added is the predetermined force or the recording position of the optical disk 1 It is recorded in the management area and can be recognized on the playback side.
- the user data (information series excluding BIS, EDC, and ECC) before 17PP modulation in a specific physical cluster where a unique ID is recorded is set to a predetermined value.
- the data string is all 0 before the scramble process is performed. Therefore, if the unique ID is not added, the content of the user data in the specific physical cluster can be recognized in advance on the playback side.
- FIG. 14 is a diagram showing a recording position of a 394-bit unique ID (unique ID unit) in a specific physical cluster.
- Each of the 394 bits that make up the unique ID unit is associated with one data frame (155 bytes (before modulation): 1 row) in the physical cluster.
- the value (0 or 1) of each bit constituting the unique ID queue is recorded in the associated data frame.
- the value of each bit constituting the unique ID unit (394 bits) is recorded in 394 data frames out of the total 496 data frames constituting the physical cluster.
- ECC error correction code
- Figure 15 shows a data frame in which any one bit (b) of the unique ID is recorded.
- a data frame in which a unique ID is recorded has a continuous 4-byte first continuous area 11 following the frame sync, followed by a continuous 4-byte second continuous area 12. Is provided.
- the consecutive 4 bytes here means 4 bytes before 17PP modulation is applied.
- an arbitrary 1 bit (b) of the unique ID is recorded as follows.
- a specific land in the continuous region 12 is irradiated with high-power laser light, and the land is formed into pits.
- the land that is irradiated with the laser beam and pitched is ⁇ If the land is replaced with a pit, the whole including the bit string before and after the 17PP modulation and NRZI conversion A land that becomes a bit string according to a modulation rule. Such a land is hereinafter referred to as a “specific land”.
- the position of the “specific land” in each of the first continuous area 11 and the second continuous area 12 is found in advance, and the bit value of the unique ID is 0. Accordingly, either the first continuous area 11 or the second continuous area 12 is selected, and a specific land of the selected continuous area is formed into a pit.
- the number of specific lands to pit is not limited to one and may be plural as long as they are in the same continuous area. In other words, a plurality of specific lands in a continuous area may be pitched.
- the land / pit pattern is rewritten. However, even if the land Z pit pattern is forcibly rewritten, it follows the modulation rules of 17PP modulation and NR ZI conversion.
- the land / pit pattern of the specific physical cluster can be read from the optical disc 1 and the NRZI conversion and the 17PP modulation can be demodulated as usual.
- some user data can be read from a specific physical cluster in which a unique ID is recorded by a normal reproduction circuit. If some user data can be read out, by comparing the read demodulated user data with the original data (for example, all zero data) to be read from the land Z pit pattern before the laser recording process, It is possible to detect which of the first continuous area 11 and the second continuous area 12 has the error, that is, whether it is different from the original data. That is, if an error occurs in the first continuous area 11 of a data frame, the value of the unique ID bit associated with the data frame is “0”, and conversely, the second continuous area 11 If an error has occurred in area 12, the value of the unique ID bit is “1”.
- the optical disc 1 it is possible to detect the unique ID that has been subjected to the laser recording process as described above, using a circuit that reproduces and demodulates normal user data. However, the unique ID is additionally recorded. If the physical cluster power is also subjected to error correction processing on the read data, the bit value of the unique ID will disappear. Therefore, the error correction processing function must be stopped when a unique ID is detected.
- the unique ID written in the physical cluster as described above can read the unique ID as follows.
- Figures 17, 18 and 19 show the specific physical cluster force, logical blocks of data after being subjected to NRZI conversion and 17PP modulation demodulation (ECC blocks: EDC, ECC are added) State 304 bytes X (216 lines + 32 lines) data).
- ECC blocks EDC, ECC are added
- State 304 bytes X (216 lines + 32 lines) data State 304 bytes X (216 lines + 32 lines) data).
- the first bit (b) of the unique ID unit (394 bits) is a logical block.
- the 0th, 2nd, 4th, 6th, 8th, 10th, 12th, and 14th rows are included in the thread.
- the first 4 bytes (0th, 2nd, 4th and 6th bytes) are the data read from the first continuous area 11, and the last 4 bytes (8th, 10th, 12th and 14th bytes) are the first. Therefore, whether the 0th, 2nd, 4th, and 6th bytes of the demodulated logical block are different from the original data (if the original data is 0, it is not 0) ), Or 8th, 10th, 12th, and 14th bytes are different from the original data (by determining whether the original data is 0, it is not 0). The value of the bit to be detected can be detected.
- the second bit (b) of the unique ID unit (394 bits) is in the first, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth rows of the logical block. It is in the warp.
- the first 4 bytes (1st, 3rd, 5th and 7th bytes) are the data from which the first continuous area 11 forces were read, and the last 4 bytes
- the bytes (9th, 11th, 13th and 13th bytes) are the data read from the second continuous area 12. Therefore, the 1st, 3rd, 5th and 7th bytes of the demodulated logical block are different from the original data.
- FIG. 19 shows the byte positions on the logical block of 4 bytes of data read from the first area 11 for all bits of the unique ID unit (394 bits). Note that the number described in the byte position in the logical block of FIG. 19 corresponds to the bit number of the unique ID unit.
- Each byte position corresponding to FIG. 19 is referred to, and it is determined whether or not it is different from the original data (if the original data is 0, it is not 0). The value of the default can be detected.
- the continuous area in the data frame (1st continuous area 11 and 2nd continuous area 12) in which 1 bit of the unique ID is subjected to laser write processing is 4 bytes in the above example. It may be a continuous length.
- the reason for setting it to 4 bytes or more is as follows.
- the present inventor performs 17PP modulation on a large number of random data patterns, and if any length is secured, a “specific land” as shown in FIG. 3 is generated in the continuous region. We investigated whether the probability could be very high. As a result, we obtained confirmation that “specific lands” would be generated in a range that would be practical enough, regardless of the original data sequence, if it was 4 bytes or more.
- the length of the continuous areas (first continuous area 11 and second continuous area 12) in the data frame is set to 4 bytes or more.
- a pattern called (pit-land-pit) exists on the disc, and the central pit portion is completely landed by irradiating a high-power laser beam. It's something
- relatively long (for example, 4T or more) pits and lands exist adjacent to each other on the disk, and the boundary portion is irradiated with a high-power laser beam. In this case, the boundary position of the pit land is shifted by a predetermined clock.
- the force that sets the continuous area (the first continuous area 11 and the second continuous area 12) to a position following the frame sync.
- two continuous areas are provided, one corresponding to the case where the bit value is 0 and the other corresponding to the case where the bit value is 1.
- only one continuous area is set in the data frame, and when the bit value is 0, a specific land in the continuous area is pitched and the bit value is If is 1, it may be recorded that no processing is performed.
- ECC error detection code
- the format toy casting process S11 is executed.
- the formatting step S11 is executed by a computer or the like.
- content data (user data) stored on the optical disc 1 and user data (base data) recorded in advance in a specific physical cluster in which a unique ID is recorded are input.
- the input content data and base data are converted into a data string in a format corresponding to BD. Specifically, error detection code (EDC) addition processing, scrambling processing, parity code addition, interleaving processing, BIS cluster addition processing, and the like are performed.
- EDC error detection code
- the base data is 64-kbyte data that is all zero. That is, the user data of the physical cluster in which the unique ID is recorded is all 0.
- the scramble process is applied to the for pine toy process S11, the data string before 17PP modulation differs depending on the location and not all 0 before the laser append process. In this example, it may be a powerful specific data string in which the base data is a zero data string.
- the format data is added by adding a BIS cluster or the like so that the base data is recorded in a physical cluster at a specific address on the optical disc 1. That is, it is recorded in a specific physical cluster in which the base data power unique ID is recorded. , Format it.
- variable length modulation step SI 2 is executed.
- variable length modulation step S12 is executed by a computer or the like.
- the data string formatted in the format toy step S11 is input.
- the input data string is subjected to 17PP modulation and NRZI conversion to generate a modulated bit string.
- the pattern force of 0 and 1 of this bit string is the pit Z land pattern formed on the recording track of the optical disc 1.
- a photoresist is applied to the glass master, and a laser is irradiated on the applied photoresist in accordance with the generated pit Z land pattern to form an uneven pattern along the recording track. . Subsequently, the resist on which the concave / convex pattern is recorded is image-processed and fixed on the master, and the surface of the master is electroplated to produce the metal master 14.
- the disk forming step S15 is performed.
- a stamper is manufactured based on the manufactured metal master, a stamper is placed in the mold, and the disk substrate 16 is made of transparent resin such as polycarbonate or acrylic using an injection molding machine. To form a large amount.
- a large number of disk substrates 16 produced in this way are formed along the land and pit pattern force recording tracks corresponding to the bit strings generated in the modulation step S12.
- the unique ID generated uniquely for each medium is additionally recorded on each disk substrate 16 that is generated in large quantities by the UID writing device 20.
- the UID writing device 20 is a device for additionally recording each unique ID on the same optical disk 1 produced in large quantities.
- the UID writing device 20 irradiates the optical disc 1 with a laser beam of energy sufficiently higher than that during normal reproduction, and additionally writes each bit of the unique ID.
- a laser beam of energy sufficiently higher than that during normal reproduction, and additionally writes each bit of the unique ID.
- a UID detection unit 22 that detects a writing position of each bit of the key ID, a UID generation unit 23 that generates a unique ID, a drive unit 24 that drives the optical disc 1 to rotate, and the like.
- the laser beam for irradiating a specific land is switched according to the bit string of the unique ID generated from the UID generation unit 23.
- the UID generation unit 23 receives the actual data of the input unique ID.
- the UID generation unit 23 adds an error detection code (EDC), an error correction code (ECC), and the like to the input entity data and checks the data into a predetermined format.
- EDC error detection code
- ECC error correction code
- the UID generation unit 23 further divides the formatted bit string into bit strings divided into 394-bit units in units of physical clusters, and outputs them to the UID writer 21.
- the drive unit 24 rotates the optical disc 1.
- the laser beam is traced along the recording track of the optical disc 1.
- a pit and land pattern recorded in advance on the optical disc 1 is recorded in the memory inside the UID detector 22.
- the UID detection unit 22 knows the laser beam position on the optical disc 1 by comparing the pit and land patterns actually read from the optical disc 1 with the patterns recorded in the memory. it can. Further, it can be detected by the signal of the UID detection unit 22 that the laser beam has reached a specific land on the recording track.
- the UID writer 21 emits high-power laser light when the UID detection unit 22 detects a specific land. However, at this time, the UID writer 21 applies a laser beam to the second continuous area 12 according to the bit value output from the UID generation unit 23.
- the first continuous area 11 in the data frame is irradiated with laser light. Switching of whether or not the light is irradiated That is, if the bit value “0” is recorded, the first continuous area 11 is irradiated with laser light, and if the bit value “1” is recorded, the second continuous area 12 is irradiated with laser light. Switching.
- the UID writer 21 is provided on the optical disc 1 as described above, and records a bit value for each data frame of a plurality of physical clusters. As a result, a unique ID can be additionally recorded on the optical disc 1.
- the optical disc 1 can be manufactured by executing the above steps S11 to S17. Disc making method (other methods)
- a unique ID additional process S 18 is provided between the variable length modulation process S 12 and the master generation process S 13, and the unique ID additional process S 17 after the disk forming process S 15 is eliminated. It is.
- the newly provided unique ID additional recording step S18 a pattern inversion process for forcibly inverting a predetermined land portion into pits in the pit Z land pattern output from the variable length modulation step S12 is performed.
- the newly provided unique ID additional process S 18 is a process in which the unique ID is additionally recorded by signal processing before the master is manufactured, instead of physically adding the unique ID by laser irradiation.
- the logical address and physical address of the unique ID are exactly the same as when recording by laser irradiation processing.
- the land to which the pattern should be reversed (specific land) is the same.
- FIG. 25 is a block diagram of the playback device 30 that plays back the optical disc 1 with a unique ID added.
- the playback device 30 is provided with a function for playing back a unique ID along with a normal playback function for BD content data!
- the hardware configuration may be the same as that of a playback device that plays back a normal BD in which no unique ID is recorded.
- the unique ID described above can be detected by diverting the hardware of a normal playback device and adding only new firmware for controlling the operation of the controller. This is because the unique ID is embedded in the actual information recording part where the content is recorded according to the normal variable length modulation method!
- the algorithm of the error detection code and error correction code is the actual information. It is the same as
- the configuration of the playback device 30 will be specifically described below.
- the reproducing device 30 includes a drive unit 31 that drives the optical disc 1, an optical head 32 that irradiates the optical disc 1 with laser light and detects the reflected light, and an optical head (OP) 3
- the analog signal processing circuit 33 that generates a control signal such as a reproduction signal and a focus error signal based on the detection signal 2 and a servo control circuit that performs various servo controls based on the control signal detected by the analog signal processing circuit 33 34 And.
- the playback device 30 includes a playback unit 35 that performs playback processing on a signal played back from the optical disc 1, a memory 36 that stores user data played back by the playback unit 35, and controls and controls the entire device. And a control Z information processing unit 37 that performs various types of information processing.
- the reproduction unit 35 receives a reproduction signal of the recording track output from the analog signal processing circuit 33, that is, a signal corresponding to the pit Z land pattern of the recording track.
- the playback unit 35 includes a PRML equalization circuit 41 that performs PRML equalization and binarization on the input playback signal, and NRZI conversion and 17PP modulation demodulation on the PRML-equalized playback data sequence.
- the playback unit 35 configured as described above performs the following operation when playing back normal content data. That is, the reproduction unit 35 reproduces a clock from the pattern signal of the pit Z land read by the optical head 32 from the optical disk 1 that is rotationally driven, performs PRML equalization, 17 PP modulation demodulation, and error correction processing. The information recorded on the optical disc 1 is reproduced. Information reproduced by the reproduction unit 35 is temporarily stored in the memory 36 and output to the outside.
- control Z information processing unit 37 gives the address of a specific physical cluster in which the unique ID is recorded to the servo control circuit 34, and issues a read instruction for the specific physical cluster.
- the servo control circuit 34 controls the drive unit 31 and the optical head 32 to start reading information recorded in the designated physical cluster.
- the reproduction unit 35 reproduces a clock from the pattern signal of the pit Z land read by the optical head 32, performs PRML equalization, 17PP modulation demodulation, and records the information recorded in the specific physical cluster of the optical disc 1. Reproduce. Information reproduced by the reproduction unit 35 is stored in the memory 36.
- control Z information processing unit 37 refers to the data that is also read from the specific physical cluster power stored in the memory 36, causes the ECC decoder 43 to perform error correction processing of the unique ID, and is recorded on the optical disc 1. Detect the contents of the unique ID.
- control Z information processing unit 37 compares the information stored in the memory 36 with the original data (for example, all zero data) before the unique ID is added, and the data is different. And determine the contents of the unique ID.
- control Z information processing unit 37 When the control Z information processing unit 37 detects the unique ID, the control Z information processing unit 37 performs various processes based on the content of the unique ID.
- the bit value of the unique ID is 0, the specific land in the first continuous area 11 of the corresponding data frame is pitched, and the value of the bit of the unique ID is 0. If there is, a specific land in the second continuous area 12 of the corresponding data frame is formed into a pit. In other words, from the playback side, if an error has occurred in the first continuous area 11, the corresponding unique ID bit value is 0, and an error has occurred in the second continuous area 12. In this case, it can be said that the corresponding unique ID bit value is 1.
- the XZ arithmetic processing unit 37 starts processing from step S21.
- step S21 the control Z arithmetic processing unit 37 calculates the number of bits in error in the data sequence read from the first continuous area 11 (number of bits different from the original data). calculate.
- the number of error bits of a first continuous area 11 shall be the err_ C nt_ X [0].
- step S22 the control Z arithmetic processing unit 37 calculates the number of bits in error in the data sequence read from the second continuous area 12 (the number of bits different from the original data). calculate. Incidentally, the number of error bits in the second continuous area 12, and err_ C nt_ X [l].
- step S23 the control / arithmetic processing unit 37 determines whether err_cnt_x [0]> N or err_cnt_x [l]> N.
- step S25 the control Z arithmetic processing unit 37 determines whether or not err_cnt_x [0]> err_cnt_x [1].
- step S24 If err cnt x [0]> err cnt x [l] is not satisfied (NO in step S24), the value of bit b is “1”.
- the method described above is simple but also includes some problems. The following describes how to solve these problems and achieve better unique ID recording.
- the first problem is the DC control bit.
- the unique ID is recorded using 8 bytes (4 bytes ⁇ 2 area) immediately after the frame sync.
- a DC control bit is inserted in this 8-byte section.
- the change in the data after 17PP decoding is undesirably limited to only the DC control bits. Since the DC control bit information is removed and cannot be detected, there is a possibility that it cannot be detected as unique ID data.
- both the first continuous area 11 and the second continuous area 12 are set to areas not including DC control bits.
- the first continuous recording area 11 is set at a position 82 bits away after the frame sync. This position is between the frame sync and the first continuous recording area. Includes two DC control bits! Since 17PP modulation is performed in units of 2 bits, when 2 (even) DC control bits are inserted in this way, the delimitation of the recorded data is not affected by the DC control bits.
- the first continuous recording area 11 is at a position where 10 bytes have elapsed from the frame sync. In this way, since the delimiter is good even in byte units, the correspondence with user data can be easily obtained.
- the second continuous recording area 12 is set at a position 164 bits away from the frame sync. Similarly, the position of the recorded data is not affected by the DC control bit, and this position is good even in byte units.
- FIG. 29 to FIG. 32 are diagrams for explaining the second modified example in order to solve such a problem.
- the data recorded in the first continuous recording area 11 and the second continuous recording area 12 as the base data is the next 4 bytes (87, 8F, 88, 8A).
- a NRZI modulated pattern is recorded.
- the “specific land” shown in both FIG. 2 and FIG. 3 appears, so there are possibilities that the number of options for the recording method increases and the recording apparatus can be simplified. That is, as shown in Fig. 29, as a result of 17PP modulation, the first byte (after 17PP modulation) The pattern “101” always appears at the end of the first 12 bits in the data string. This part is a 2T pattern on the disc. If this 2T pattern becomes a land! / You can record a unique ID as a “specific land”. Similarly, 101 patterns appear in the second byte (13th to 24th bits in the data string after 17PP modulation) as shown in FIG. 30 to form a 2T pattern.
- the 2T pattern of either the first byte or the second byte is always a land. In this way, it is possible to pit by applying a strong laser beam to the 2T land that always exists in either.
- These 2T patterns are selected to maintain the correct 17PP modulation pattern even when landed. Specifically, the first byte changes to "82" data, and the second byte changes to "80" data.
- the third byte 25th to 36th bits in the data string after 17PP modulation
- the fourth byte from the 37th bit to the 48th bit in the data string after 17PP modulation.
- bit even when the pit edge position is shifted by 1T, a pattern that can be decoded as a correct 17PP modulation pattern is selected and recorded.
- the third byte and the fourth byte are also configured such that the polarities of the positions where the pit edge positions are shifted by 1T are different from each other. Therefore, as shown in Fig. 33A and Fig. 33B, the edge pattern of either the third byte or the fourth byte is always a land. Specifically, the 3rd byte changes to "8A" data and the 4th byte changes to "CA" data!
- the identification information for each medium or each title is recorded as a unique ID.
- the control information that controls the playback of different programs and content data for each disc is recorded as a unique ID. May be.
- a game program can be played differently on each disc.
- the story can be partially different depending on the disc purchased. It is also possible to change the contents of the unique ID little by little immediately before release. For example, it is possible to stock optical discs that have been mass-produced at the factory and change the name of the place for each shipping region, the recording paper, and the movie or game story when actually shipping.
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- Computer Security & Cryptography (AREA)
- Multimedia (AREA)
- Manufacturing & Machinery (AREA)
- Optical Recording Or Reproduction (AREA)
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Abstract
Description
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JP2006134386A (ja) * | 2004-11-02 | 2006-05-25 | Sony Corp | 光ディスク再生方法及び装置、並びに、光ディスク製造方法 |
JP2006260614A (ja) * | 2005-03-15 | 2006-09-28 | Sony Corp | ディスク製造方法、データ記録装置、情報記録媒体、情報処理装置および方法、並びにコンピュータ・プログラム |
JP4622947B2 (ja) | 2006-06-29 | 2011-02-02 | ソニー株式会社 | 光ディスクおよび光ディスクの製造方法 |
JP5082404B2 (ja) * | 2006-11-22 | 2012-11-28 | ソニー株式会社 | 再生専用型光ディスク媒体及びその製造方法 |
JP4280288B2 (ja) | 2007-02-01 | 2009-06-17 | 株式会社ソニー・ディスクアンドデジタルソリューションズ | 再生専用型光ディスク媒体及びその製造方法 |
JP5057925B2 (ja) * | 2007-10-18 | 2012-10-24 | 株式会社日立製作所 | デジタル情報再生方法 |
EP2362394B1 (en) * | 2009-01-13 | 2018-11-21 | Panasonic Intellectual Property Management Co., Ltd. | Information recording device, information reproducing device, and information recording medium |
US8493247B2 (en) * | 2011-12-20 | 2013-07-23 | General Electric Company | Methods and systems for decoding data |
US8493246B2 (en) | 2011-12-20 | 2013-07-23 | General Electric Company | Methods and systems for decoding data |
TWI642054B (zh) * | 2016-05-27 | 2018-11-21 | 日商新力股份有限公司 | Signal processing device and signal processing method |
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Also Published As
Publication number | Publication date |
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US8050163B2 (en) | 2011-11-01 |
JP2006134385A (ja) | 2006-05-25 |
TWI327312B (ja) | 2010-07-11 |
US20090067309A1 (en) | 2009-03-12 |
TW200636697A (en) | 2006-10-16 |
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