WO2011007670A1 - 情報記録装置、情報再生装置、記録媒体製造装置、情報記録媒体、および方法、並びにプログラム - Google Patents
情報記録装置、情報再生装置、記録媒体製造装置、情報記録媒体、および方法、並びにプログラム Download PDFInfo
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- WO2011007670A1 WO2011007670A1 PCT/JP2010/061158 JP2010061158W WO2011007670A1 WO 2011007670 A1 WO2011007670 A1 WO 2011007670A1 JP 2010061158 W JP2010061158 W JP 2010061158W WO 2011007670 A1 WO2011007670 A1 WO 2011007670A1
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- phase error
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- 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
- G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
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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
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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
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
- G11B20/00405—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track
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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
- G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
- G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
- G11B20/00601—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
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- 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
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24082—Meandering
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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
Definitions
- the present invention relates to an information recording apparatus, an information reproducing apparatus, a recording medium manufacturing apparatus, an information recording medium, a method, and a program. More specifically, an information recording apparatus, an information reproducing apparatus, and a recording medium manufacturing for recording or reproducing additional information such as a content key on a groove signal recorded as additional information such as a recording condition of a disc (information recording medium)
- the present invention relates to an apparatus, an information recording medium, a method, and a program.
- meandering that is, a wobbled groove
- additional information such as address information and recording conditions for a data recording track.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-213781 discloses a configuration in which key information is recorded in a groove and used.
- CPS data such as key information that is application data of the content protection system (CPS) is recorded on a disk and used are as follows. 1. The reliability of the CPS data playback signal is high. 2. It is difficult to copy CPS data to other media. 3. The manufacturing cost of the CPS data storage medium and the recording / reproducing drive must not be significantly increased. For example, there are such requirements.
- Patent Document 1 Japanese Patent Laid-Open No. 2004-213781
- Japanese Patent Laid-Open No. 2004-213781 discloses a configuration in which key information is recorded in a groove and used. This prior art is also devised to satisfy the above requirements.
- secret information decoding technology is also progressing, and a recording configuration with even higher secrecy is required.
- the present invention has been made in view of, for example, the above-described problems, and increases the difficulty of decoding in a configuration in which additional information such as an encryption key for content recorded on a disk is superimposed on a groove signal for recording or reproduction.
- Another object of the present invention is to provide an information recording apparatus, an information reproducing apparatus, a recording medium manufacturing apparatus, an information recording medium, a method, and a program that enable accurate data reading.
- the first aspect of the present invention is: A recording signal generator for generating a groove signal for recording additional information; A recording unit that records the recording signal generated by the recording signal generation unit on a master disk; The recording signal generator is Determine a phase error setting mode according to each bit value constituting the additional information, The recording medium manufacturing apparatus generates a recording signal in which a phase error corresponding to each bit value constituting the additional information is set for each predetermined section of the recording signal.
- the recording signal generation unit sets a direction of a phase error to be set in the groove signal depending on whether the bit value of the additional information is 0 or 1 Or a recording signal in which the combination of directions is set in a different manner.
- the additional information is information including an encryption key applied to an encryption process or a decryption process of content recorded on the disc.
- the second aspect of the present invention provides A playback unit for reading the groove signal recorded on the disc; A signal analysis unit for analyzing a reproduction signal of the reproduction unit; The signal analysis unit In the information reproducing apparatus, the phase error direction included in the groove signal is determined in units of a predetermined signal section, and the constituent bit value of the additional information included in the groove signal is determined based on the determination result.
- the signal analysis unit calculates a phase error index value using detected values of sampling points before and after the zero cross point of the groove signal, and the phase error index value Is performed to determine the setting direction of the phase error in the predetermined signal section by comparing the result obtained by integrating the signal in units of the predetermined signal section with a preset threshold value.
- the information reproducing apparatus further applies an encryption key included in the additional information analyzed by the signal analyzing unit to record the encrypted content recorded on the disc.
- a decryption processing unit for performing the decryption process.
- the third aspect of the present invention provides A playback unit for reading the groove signal recorded on the disc; Signal analysis for discriminating the phase error direction included in the groove signal read from the disc in the reproducing unit in units of a predetermined signal section and analyzing the encryption key superimposed and recorded on the groove signal by the bit value judgment processing based on the discrimination result And An encryption processing unit that performs encryption processing of content by applying the encryption key analyzed by the signal analysis unit;
- the information recording apparatus includes a recording unit that records the encrypted content generated by the encryption processing unit on the disc.
- the signal analysis unit calculates a phase error index value using detected values of sampling points before and after the zero cross point of the groove signal, and the phase error index value Is performed to determine the setting direction of the phase error in the predetermined signal section by comparing the result obtained by integrating the signal in units of the predetermined signal section with a preset threshold value.
- the fourth aspect of the present invention provides An information recording medium that records a groove signal used for recording additional information,
- the groove signal is recorded as an additional information superimposed signal in which a phase error of a different aspect according to a configuration bit value of the additional information is set in a predetermined signal section unit,
- the information recording medium enables reading of the additional information based on detection of the phase error setting mode in the reproducing apparatus.
- the groove signal has a phase error direction or direction set in the groove signal according to a case where the bit value of the additional information is 0 or 1. It is the signal which set the combination to the different aspect.
- the additional information is information including an encryption key applied to an encryption process or a decryption process of content recorded on the disc.
- the fifth aspect of the present invention provides An information recording medium manufacturing method executed in a recording medium manufacturing apparatus, A recording signal generating unit that generates a groove signal for recording additional information; and The recording unit has a recording step of recording the recording signal generated in the recording signal generating step on a master disk, The recording signal generation step includes Determine a phase error setting mode according to each bit value constituting the additional information, The information recording medium manufacturing method includes a step of generating a recording signal in which a phase error corresponding to each bit value constituting the additional information is set for each predetermined section of the recording signal.
- the sixth aspect of the present invention provides An information reproduction method executed in the information reproduction apparatus, A playback unit for reading a groove signal recorded on the disc;
- the signal analysis unit has a signal analysis step for analyzing the reproduction signal in the reproduction step,
- the signal analysis step includes In the information reproducing method, the phase error direction included in the groove signal is determined in units of a predetermined signal section, and the constituent bit value of the additional information included in the groove signal is determined based on the determination result.
- the seventh aspect of the present invention provides An information recording method executed in an information recording device, A playback unit for reading a groove signal recorded on the disc;
- the signal analysis unit discriminates the phase error direction included in the groove signal read from the disc in the reproduction step in units of a predetermined signal section, and the encryption key recorded and superimposed on the groove signal by the bit value determination process based on the discrimination result
- a signal analysis step for analyzing the configuration bit information
- An encryption processing step wherein the encryption processing unit executes the content encryption processing by applying the encryption key analyzed in the signal analysis step;
- the recording unit includes a recording step of recording the encrypted content generated in the encryption processing step on the disc.
- the eighth aspect of the present invention provides A program for executing information reproduction processing in the information reproducing apparatus; A reproduction step for causing the reproduction unit to read the groove signal recorded on the disc; A signal analysis step for causing the signal analysis unit to analyze the reproduction signal in the reproduction step;
- the signal analysis step includes The program includes a step of determining a phase error direction included in the groove signal in units of a predetermined signal section and determining a constituent bit value of additional information included in the groove signal based on a determination result.
- the ninth aspect of the present invention provides A program for executing an information recording process in an information recording device, A reproduction step for causing the reproduction unit to read the groove signal recorded on the disc; An encryption key that is recorded in a superimposed manner on the groove signal by a bit value determination process based on a determination result based on a phase difference direction included in the groove signal read from the disk in the reproduction step in a predetermined signal section unit.
- a signal analysis step for analyzing the configuration bit information;
- An encryption processing step for causing the encryption processing unit to execute content encryption processing by applying the encryption key analyzed in the signal analysis step;
- the program includes a recording step of causing the recording unit to record the encrypted content generated in the encryption processing step on the disc.
- the program of the present invention is a program that can be provided by, for example, a storage medium or a communication medium provided in a computer-readable format to an image processing apparatus or a computer system that can execute various program codes.
- a storage medium or a communication medium provided in a computer-readable format to an image processing apparatus or a computer system that can execute various program codes.
- system is a logical set configuration of a plurality of devices, and is not limited to one in which the devices of each configuration are in the same casing.
- superimposed recording that realizes both reading difficulty and high-precision reading can be performed in a groove signal in which highly confidential additional information such as an encryption key is recorded on a disc. It becomes possible.
- additional information is recorded, a groove signal in which a phase error corresponding to the bit value is set is recorded, and when the additional information is read, the phase error of the groove signal in a predetermined section is integrated to obtain a phase error of the groove signal in each section. It was set as the structure which discriminates a direction. By such processing, reading difficulty can be enhanced, and additional information can be recorded / reproduced to realize highly accurate reading.
- FIG. 1 is a block diagram showing a configuration of a recording medium manufacturing apparatus according to an embodiment of the present invention.
- the recording medium manufacturing apparatus 100 manufactures a master disk 130 that is a disk master. Thereafter, the disk 150 which is an information recording medium provided to the user by the stamper process of the master disk 130 is mass-produced.
- the groove signal is constituted by meandering or wobbled grooves.
- the recording medium manufacturing apparatus 100 inputs additional information 120 such as recording conditions, for example, additional information 120 such as an encryption key, and generates a recording signal.
- additional information 120 such as an encryption key
- the groove signal is recorded on the master disk 130 in accordance with the generated recording signal.
- the additional information 120 is data including encryption key constituent bits such as 64 bits and 128 bits. This additional information 120 is input to the recording signal generator 102.
- the recording signal generation unit 102 inputs additional information 120 such as recording conditions and generates a recording signal (groove signal) to be recorded on the master disk 130.
- the recording signal generation unit 102 generates a wobbling groove signal indicating additional information such as a recording condition by FM (Frequency Modulation) modulation processing. Additional information such as recording conditions is recorded by setting a phase error for the groove signal (FM modulation signal). This process will be described in detail later.
- the recording signal generated by the recording signal generation unit 102 is output to the recording unit 103.
- the recording unit 103 forms a groove corresponding to a recording signal on the master disk 130 by laser output, for example.
- the groove signal recorded on the master disk 130 is a spiral groove along the data track where the content is recorded.
- additional information such as recording conditions, for example, a groove signal on which an encryption key is superimposed.
- the disc 150 may be a disc on which content such as a movie is recorded, or a disc on which no content is recorded.
- a disc on which no content is recorded is a disc on which data can be written by the user.
- a user who has purchased such a disc 150 can record content such as a movie on the disc 150 at a later date.
- a user who has purchased a disc on which no content is recorded connects to the content providing server via a network using a recording / playback device such as the user's PC.
- the server provides the user device with encrypted content that can be decrypted using the encryption key recorded on the disk 150.
- the user device records the content downloaded from the server on the disc 150. Thereafter, in the content reproduction process, the encryption key is read from the groove signal recorded on the disk 150, and the decryption process of the encrypted content recorded on the disk 150 is executed using the read encryption key to perform the content reproduction process. Can do.
- the encrypted content and the encryption key applied to the decryption are stored together on one disk. Therefore, for example, even if the encrypted content is output and copied to another medium, the encryption key cannot be used, and unauthorized use of the content can be effectively prevented.
- the recording signal generation unit 102 generates a recording signal including an encryption key as additional information such as recording conditions.
- the recording signal generation unit 102 includes a modulation signal generation unit 122 and a phase error setting signal generation unit 123 as shown in FIG.
- the recording signal generation unit 102 performs a positive phase error with respect to the groove signal, and when the additional information component bit is [0], the groove signal To generate a phase error setting signal in which a phase error in the negative direction is associated.
- the modulation signal generation unit 122 generates a modulation signal that has been subjected to FM modulation processing according to additional information such as a recording condition.
- the phase error setting signal generation unit 123 generates a recording signal in which the phase error is set in the modulation signal according to the phase error information corresponding to the additional information bit with respect to the modulation signal generated by the modulation signal generation unit 122.
- FIG. 3 shows an example of a groove signal recorded on the master disk or the disk 150.
- the groove signal is a signal obtained by reproducing a groove set in a spiral shape with respect to the disk 150.
- 2 (1), (2a), and (2b) show some details. That is, an example of the groove signal of the AB portion of the disk 150 shown in FIG. 2 is shown.
- FIG. 3 shows the following signal examples.
- (1), (2a), (2b) correspond to the plane of the disc, and the right direction is the signal direction of the track.
- the groove signal without the phase error setting shown in FIG. 3A is indicated by dotted lines in (2a) and (2b).
- the solid lines shown in FIGS. 3 (2a) and (2b) are groove signals having a phase error, and the dotted lines are groove signals consisting only of additional information such as original recording conditions that do not have a phase error.
- the + direction phase error setting groove signal indicated by the solid line is slightly shifted in the track traveling direction (+ direction) as compared to the groove signal indicated by the dotted line (no phase error). This deviation is a + direction phase error.
- the -direction phase error setting groove signal indicated by the solid line is slightly shifted in the track opposite direction ( ⁇ direction) as compared with the groove signal indicated by the dotted line (no phase error). Yes. This deviation is a negative direction phase error.
- the groove signal recorded on the master disk and the disk has a setting in which different types of groove signals in FIGS. 3 (1), (2a), and (2b) are mixed.
- the constituent bits of the additional information such as key information are recorded by the phase error.
- the reproducing apparatus detects a phase error from the groove signal and analyzes the bit value of the additional information based on the detected phase error. A specific example of correspondence between phase error setting and bit data will be described with reference to FIG.
- FIG. 4 is a diagram showing an example of a recording process and a reproducing process of the groove signal.
- An example in which a groove signal is recorded with such settings is shown.
- the groove signal in which the phase error in the + direction (track traveling direction) is set is recorded for a predetermined period.
- the component bit of the additional information is 1, a groove signal in which a phase error in the negative direction (track opposite direction) is set is recorded for a predetermined period.
- phase error to be set is negligible. For example, a phase error of about 1 to 5% of the period T of the sampling signal in the reproduction process is set. Therefore, it is difficult to determine whether the set phase error is in the positive direction or the negative direction with one reading.
- the groove signal having a phase error in the + direction is set and recorded in a certain section.
- the playback device executes reading of the groove signal at a predetermined sampling time (T) interval, and accumulates (integrates) the value of the signal read at each sampling time.
- T sampling time
- the direction (+, ⁇ ) of the phase error of the groove signal read in a certain section is determined.
- both the recording device and the reproducing device have various control timings set by the clock set in the device, and sections such as t1 to t2 shown in FIG. 4 can be discriminated based on a predetermined number of clocks. .
- the playback device analyzes the phase error in units of a fixed interval such as t1 to t2 and t2 to t3 shown in FIG. By this analysis, it is possible to generate different phase error accumulation signals (integrated signals) corresponding to the three patterns.
- phase error accumulation processing that is, detection signal integration processing, it is possible to detect without error whether the set phase error is in the + direction or the-direction.
- the playback device performs the following processing.
- FIG. 5 is a block diagram showing a configuration example of an information reproducing apparatus according to an embodiment of the present invention.
- the information reproducing apparatus 200 includes a reproducing unit 201, a signal analyzing unit 202, and a decoding processing unit 204.
- the playback unit 201 reads a signal from the disk 150.
- the disk 150 is a disk on which a groove signal on which additional information such as the encryption key described above is superimposed is recorded. Further, encrypted content encrypted with the encryption key is recorded.
- the reproduction unit 201 reads the groove signal and outputs it to the signal analysis unit 202.
- Groove signal without phase error setting (2a) + Directional phase error setting groove signal (2b)-Directional phase error setting groove signal This is a groove signal in which these three patterns of signals are mixed.
- the signal analysis unit 202 performs demodulation processing and analysis of the groove signal input from the reproduction unit 201, detects a phase error, and configures additional information constituent bits recorded in the groove signal based on the detected phase error Detect value.
- the additional information 120 is obtained based on the configuration bit information of the additional information detected by the signal analysis unit 202.
- the additional information 120 is an encryption key and is applied to the decryption process of the encrypted content recorded on the disc 150.
- other additional information included in the groove signal for example, address information 125 is obtained from the result demodulated by the signal analysis unit 202.
- the phase error set in the groove signal is a slight phase error as described above, and does not affect the acquired address information to the extent that an error occurs.
- the process of obtaining other additional information included in the groove signal is performed as a general groove signal reading process. For example, FM demodulation processing is performed on the push-pull signal obtained as a read signal of the groove signal, band-pass filter processing and binarization processing are performed on the demodulation processing result, and processing such as ECC decoding and deinterleaving is performed as necessary.
- other additional information included in the groove signal for example, address information 125 and basic information (disc type, write strategy parameter, etc.) of the disc are acquired.
- the decryption processing unit 204 When reading the content recorded on the data track, for example, the address information in the data area is applied and a pickup is set at a predetermined track position to read the encrypted content.
- the decryption processing unit 204 performs decryption processing of the encrypted content by applying the additional information (encryption key) 120 acquired from the groove signal, and performs content reproduction.
- the signal analysis unit 202 includes a demodulation unit 221, a phase error detection unit 222, and a bit value determination unit 223.
- the demodulating unit 221 inputs a groove signal recorded on the disc as an FM modulated signal from the reproducing unit 201 and executes demodulation processing.
- the phase error detection unit 222 reads the groove signal at a predetermined sampling time (T) interval, and accumulates the value of the signal read at each sampling time ( Integration).
- T sampling time
- Integration the integration process is performed, for example, as an integration process for a push-pull signal obtained from a groove signal read signal.
- the direction (+, ⁇ ) of the phase error of the groove signal read in a certain section is determined.
- phase error detection unit 222 of the information reproducing apparatus determines which of the above three patterns is the error setting groove signal in units of a fixed interval such as t1 to t2 and t2 to t3 shown in FIG.
- phase error detection process executed by the phase error detection unit 222 will be described with reference to FIG.
- FIG. 7 (1) is an example of a groove signal similar to that described above with reference to FIG. 3 (2a).
- the groove signal in which the phase error is set in the + direction (track traveling direction) is indicated by a solid line. Yes.
- the dotted line shows the groove signal without phase error as a reference.
- the reading of the groove signal by the playback device is executed at a sampling interval of a certain period.
- a plurality of upward arrows shown in FIG. 7A indicate the sampling timing. From left to right, the groove signal is read at intervals T.
- the sampling data before and after the zero cross point (zero cross point) of the groove signal is used to detect the phase error.
- the zero cross point is a point where the groove signal line crosses the center position (0) as shown in FIG.
- FIG. 7 (2) is an enlarged view in which the vicinity of the sampling times tp to tq shown in FIG. 7 (1) is enlarged.
- a solid line indicates a groove signal having a phase error in the + direction, and a dotted line indicates a groove signal having no phase error as reference data.
- Two sampling data of sampling times tp and tq on both sides of the zero cross point shown in FIG. 7 (2) are used for phase error detection.
- Sampling time tp measured value X 1
- Sampling time tq measured value X 2
- the measurement value is acquired as a relative potential (voltage) value corresponding to the position of the groove.
- the measurement is performed in a range where the relative potential value of ⁇ 64 to +64 is obtained from the end of the groove signal to the end.
- the phase error index value ( ⁇ ) is calculated by applying the equation shown in FIG. 7 (3), for example. That is, the phase error index value ( ⁇ ) is calculated according to the following equation (Equation 1).
- ⁇ ((Y k ) (X k ⁇ 1 )) ⁇ ((Y k ⁇ 1 ) (X k )) (Equation 1)
- X k-1 is the measured value immediately before the zero crossing
- X k is the measured value immediately after the zero crossing Y k-1
- Y k (+ 1)
- X ⁇ 0, Y (-1) It is.
- the above formula (formula 1) is a formula for calculating the phase error index value ( ⁇ ) corresponding to one zero cross point.
- the phase error set in the groove signal is a slight error (for example, about several percent of the sampling period T). Therefore, it is difficult to determine whether the phase error is in the + direction or the ⁇ direction with only one data, and there is a high possibility that an error will occur when determining the bit value.
- the recording apparatus can perform a groove signal in which errors in the same direction are set in consecutive groove signal sections (for example, t1 to t2 shown in FIG. 4) for a certain period. Record.
- the reproducing apparatus discriminates the setting direction of the phase error in the interval by integration processing that sequentially adds the errors in the constant groove signal interval.
- the reproducing apparatus integrates the phase error index value ( ⁇ ) represented by the above formula (formula 1) in a continuous groove signal section (for example, t1 to t2 shown in FIG. 4) of a certain period, and FIG.
- Th1 ⁇ ⁇ Th2 ⁇ No phase error ⁇ ⁇ Th1 ⁇ + direction phase error ⁇ ⁇ Th2 ⁇ ⁇ direction phase error exists (Equation 2)
- the presence / absence of the phase error and the direction are determined according to the above-described determination formula (Formula 2).
- FIG. 8 is a diagram for explaining a specific example of a comparison process between the integration result ( ⁇ ) of the phase error index value ( ⁇ ) and the threshold value.
- FIG. 8 shows an example of the following three patterns.
- An example of comparison processing between the integration result ( ⁇ ) and the threshold values (Th1, Th2) is shown.
- FIG. 8 (1) shows an example in which the groove signal in the signal interval t1 to t2 is a groove signal for which no phase error is set.
- the phase error index value ( ⁇ ) at each zero cross point is generated in a substantially balanced manner in various directions without causing any bias.
- each of the three patterns of groove signals can be determined by comparing the integration result ( ⁇ ) of the phase error index value ( ⁇ ) with the threshold value. That is, Th1 ⁇ ⁇ Th2 ⁇ No phase error ⁇ ⁇ Th1 ⁇ + direction phase error exists ⁇ > Th2 ⁇ ⁇ direction phase error exists According to the above determination formula, the presence / absence of phase error and the direction can be determined.
- FIG. 7 illustrates an example of the calculation process of the phase error index value ( ⁇ ) in the case where the zero cross point of the + direction phase error setting groove signal is a downward-sloping line.
- the zero cross point occurs for two types of lines, a right-down line and a right-up line.
- the right-down line and the right-up line shown in the drawing correspond to different shake directions from the track direction on the disk plane, respectively.
- phase error index value ( ⁇ ) in the + direction phase error setting groove signal and the ⁇ direction phase error setting groove signal will be described for each of these patterns.
- FIG. 9 is a diagram illustrating a specific example of the calculation process of the phase error index value ( ⁇ ) for the + direction phase error setting groove signal.
- FIG. 9A1 shows a groove signal in which a phase error is set in the + direction (track traveling direction) by a solid line.
- the dotted line shows the groove signal without phase error as a reference.
- FIGS. 9A2 and 9A3 are enlarged views of two patterns in the vicinity of the zero cross point of the groove signal.
- A2 Processing example in the vicinity of the lower right line
- A3 Example of processing in the vicinity of a line rising to the right, These are shown.
- a dotted line is an example of a groove signal having no phase error shown as reference data.
- FIG. 9 (a2) shows an example of measured values at sampling points tp and tq of a groove signal (solid line) in which a phase error in the + direction is set and a groove signal (dotted line) without a phase error.
- phase error index value ( ⁇ ) is calculated by applying the formula (formula 1) described above.
- a value less than 0 is calculated. This corresponds to FIG. 8 (2a).
- FIG. 9 (a3) shows an example in which the groove signal line near the zero cross is rising to the right.
- FIG. 9 (a3) also shows an example of measured values at the sampling points tr and ts of the groove signal (solid line) in which the phase error in the + direction is set and the groove signal (dotted line) without the phase error.
- phase error index value ( ⁇ ) is calculated by applying the formula (formula 1) described above.
- phase error index calculated from the measured values of the two points sandwiching the zero cross point of the groove signal in which the phase error in the + direction is set, regardless of whether the zero cross point line is a right-up line or a right-down line.
- the value ( ⁇ ) is smaller than the phase error index value ( ⁇ ) calculated from the measured value of the groove signal for which no phase error is set.
- phase error index value ( ⁇ ) By integrating the phase error index value ( ⁇ ) in a predetermined measurement section, an integration result V1 as shown in FIG. 8 (2a) described above is obtained. Compare this integration result V1 with a preset threshold Th1, V1 ⁇ Th1 When the above result is obtained, it can be determined that the phase error is set in the + direction (track traveling direction) in this measurement section.
- FIG. 10 is a diagram for explaining a specific example of the calculation process of the phase error index value ( ⁇ ) for the negative direction phase error setting groove signal.
- FIG. 10B1 shows a groove signal in which a phase error is set in the negative direction (track reverse direction) by a solid line.
- the dotted line shows the groove signal without phase error as a reference.
- FIGS. 10B2 and 10B3 are enlarged views of two patterns in the vicinity of the zero cross point of the groove signal.
- B2 An example of processing in the vicinity of the lower right line
- B3 An example of processing in the vicinity of the right-up line, These are shown.
- a dotted line is an example of a groove signal having no phase error shown as reference data.
- FIG. 10 (b2) shows an example of measured values at sampling points tp and tq of the groove signal (solid line) in which the phase error in the negative direction is set and the groove signal (dotted line) without the phase error.
- FIG. 10 (b3) shows an example in which the groove signal line near the zero cross is rising to the right.
- FIG. 10B3 also shows an example of measured values at the sampling points tr and ts of the groove signal (solid line) in which the phase error in the negative direction is set and the groove signal (dotted line) without the phase error.
- phase error index value ( ⁇ ) is calculated by applying the formula (formula 1) described above.
- the phase error index calculated from the measured values of the two points sandwiching the zero cross point of the groove signal in which the negative direction phase error is set The value ( ⁇ ) is larger than the phase error index value ( ⁇ ) calculated from the measured value of the groove signal for which no phase error is set.
- phase error index value ( ⁇ ) By integrating this phase error index value ( ⁇ ) in a predetermined measurement section, an integration result V2 as shown in FIG. 8 (2b) described above is obtained. Compare this integration result V2 with a preset threshold Th2, V2 ⁇ Th2 When the above result is obtained, it can be determined that the phase error is set in the negative direction (track reverse direction) in this measurement section.
- the user information recording / reproducing apparatus can read the groove signal recorded on the loaded disc and obtain the encryption key. Furthermore, it is possible to apply the acquired encryption key, execute an encryption process of the content acquired from the server, for example, and record it on the disc.
- the server provides the user device with the encrypted content to which the same encryption key as that recorded on the disc is applied, and the user device records the encrypted content on the disc. It is also possible to perform decryption and reproduction processing using an encryption key acquired from a signal.
- FIG. 11 shows the information recording apparatus as a user apparatus that mounts the disk 150 described above, that is, the disk 150 in which the encryption key is recorded as additional information on the groove signal, and executes the recording process of the encrypted content on the disk 150. It is a block diagram which shows the example of a structure of 300. FIG.
- the information recording apparatus 300 includes a recording / playback unit 301, a signal analysis unit 302, an encryption processing unit 304, and a communication unit 305.
- the recording / playback unit 301 reads a groove signal and recorded content from the disc 150 and further executes content recording processing.
- the signal analysis unit 302 has the same configuration as the signal analysis unit 202 of the information reproduction apparatus 200 described above with reference to FIGS. 5 and 6 and executes the same processing. In other words, the demodulation and analysis of the groove signal input from the recording / reproducing unit 301 is executed to detect the phase error, and the constituent bit value of the additional information recorded in the groove signal is detected based on the detected phase error. To do.
- the additional information 120 is obtained from the configuration bit information of the additional information detected by the signal analysis unit 302.
- the additional information 120 is an encryption key, and is applied to an encryption process for content recorded on the disc 150. Further, the present invention is applied to decryption processing of encrypted content recorded on the disk 150.
- address information 125 which is other additional information included in the groove signal, is obtained from the result demodulated by the signal analysis unit 302.
- the address information 125 is used in data recording and reproduction processing with respect to the disc 150.
- the information recording apparatus 300 communicates with the content server 400 via the communication unit 305 and acquires content from the content server 400.
- the acquired content is either encrypted content or plaintext content that has not been encrypted.
- the encrypted content is encrypted content that can be decrypted with an encryption key read from the groove signal of the disk 150.
- the received encrypted content is recorded on the disc 150 via the recording / playback unit 301.
- the content to be recorded on the disc is acquired from the content server 400 via the communication unit 305.
- the content acquisition source is not limited to the server, and broadcasting and other information processing apparatuses Various settings such as other media are possible.
- Content input via an interface as a content input unit corresponding to these acquisition sources can be recorded as encrypted content on a disc.
- the encrypted content and the encryption key applied to the decryption are stored together on one disc. Therefore, for example, even if the encrypted content is output and copied to another medium, the encryption key cannot be used, and unauthorized use of the content can be effectively prevented.
- a groove signal is recorded with such a setting, and bit value discrimination is performed based on these phase errors.
- the correspondence relationship between the bit value and the phase error can be variously set, and the reverse setting described above, the setting for associating the bit value with a plurality of phase error patterns, and the like are also possible.
- An example is shown in FIG.
- FIG. 12 is a diagram showing an example of the recording process and the reproducing process of the groove signal, similar to FIG. 4 described above.
- the groove signal is recorded with such a setting.
- the example shown in FIG. 12 shows the following setting example.
- t1 to t2 + direction phase error setting groove signal t2 to t3: ⁇ direction phase error setting groove signal
- t3 to t4 -direction phase error setting groove signal t4 to t5: + direction phase error setting groove signal
- the reproduction apparatus executes reading of the groove signal at a predetermined sampling time (T) interval, and sequentially integrates the values of the signals read at each sampling time as shown in the lower part of FIG. Process.
- T sampling time
- the direction (+, ⁇ ) of the phase error of the groove signal read in a certain section is determined.
- the playback device performs the following processing.
- t1 to t2 The phase error determination result based on the reading groove signal is accumulated (integrated), and it is determined that the phase error is set in the + direction.
- t2 to t3 The phase error determination result based on the reading groove signal is accumulated (integrated), and it is determined that the phase error in the negative direction is set.
- the bit value [1] is determined.
- t3 to t4 The phase error determination result based on the reading groove signal is accumulated (integrated), and it is determined that the phase error in the negative direction is set.
- t4 to t5 The phase error determination result based on the reading groove signal is accumulated (integrated), and it is determined that the phase error in the + direction is set.
- the bit value [0] is determined based on the detection of the combination of the preceding + direction phase error setting groove signal and the subsequent ⁇ direction phase error setting groove signal.
- phase error setting direction is set as [+] [-] [+] [-] [+] [-] [+] [-]
- this problem can be solved by using a signal section in which a phase error is not set.
- a groove signal having the following settings is recorded with [0] being a section in which no phase error is set.
- Such a signal is recorded and [0] is used as a delimiter signal.
- This setting makes it possible to determine which of the [+] and [-] pairs is the preceding groove signal during playback. 1110 ... It is possible to determine whether it is the bit string.
- the series of processes described in the specification can be executed by hardware, software, or a combined configuration of both.
- the program recording the processing sequence is installed in a memory in a computer incorporated in dedicated hardware and executed, or the program is executed on a general-purpose computer capable of executing various processing. It can be installed and run.
- the program can be recorded in advance on a recording medium.
- the program can be received via a network such as a LAN (Local Area Network) or the Internet and installed on a recording medium such as a built-in hard disk.
- the various processes described in the specification are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary.
- the system is a logical set configuration of a plurality of devices, and the devices of each configuration are not limited to being in the same casing.
- both the difficulty of reading and the high-precision reading are performed in the groove signal recorded on the disc with the highly confidential additional information such as the encryption key. It is possible to perform superposition recording that realizes the above.
- a groove signal in which a phase error corresponding to the bit value is set is recorded, and when the additional information is read, the phase error of the groove signal in a predetermined section is integrated to obtain a phase error of the groove signal in each section. It was set as the structure which discriminates a direction. By such processing, reading difficulty is improved, and additional information recording / reproducing that realizes high-precision reading is realized.
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Abstract
Description
1.CPSデータの再生信号の信頼性が高いこと。
2.CPSデータの他メディアへのコピーが困難であること。
3.CPSデータ格納媒体や、記録再生ドライブの製造コストが大幅に高くならないこと。
例えば、このような要件がある。
付加情報を記録するグルーブ信号を生成する記録信号生成部と、
前記記録信号生成部の生成した記録信号をマスタディスクに記録する記録部を有し、
前記記録信号生成部は、
前記付加情報を構成する各ビット値に応じた位相誤差設定態様を決定し、
前記記録信号の所定区間単位で前記付加情報を構成する各ビット値に応じた位相誤差を設定した記録信号を生成する記録媒体製造装置にある。
ディスクに記録されたグルーブ信号を読み取る再生部と、
前記再生部の再生信号の解析を行う信号解析部を有し、
前記信号解析部は、
前記グルーブ信号に含まれる位相誤差方向を、所定信号区間単位で判別して判別結果に基づいて前記グルーブ信号に含まれる付加情報の構成ビット値の判定を行う構成である情報再生装置にある。
ディスクに記録されたグルーブ信号を読み取る再生部と、
前記再生部においてディスクから読み取られたグルーブ信号に含まれる位相誤差方向を所定信号区間単位で判別し、判別結果に基づくビット値判定処理により前記グルーブ信号に重畳記録された暗号鍵を解析する信号解析部と、
前記信号解析部の解析した暗号鍵を適用してコンテンツの暗号化処理を実行する暗号処理部と、
前記暗号処理部の生成した暗号化コンテンツを前記ディスクに記録する記録部を有する情報記録装置にある。
付加情報を記録するために利用されるグルーブ信号を記録した情報記録媒体であり、
前記グルーブ信号は、所定信号区間単位で付加情報の構成ビット値に応じた異なる態様の位相誤差が設定された付加情報重畳信号として記録され、
再生装置において前記位相誤差の設定態様の検出に基づいて前記付加情報を読み取ることを可能とした情報記録媒体にある。
記録媒体製造装置において実行する情報記録媒体製造方法であり、
記録信号生成部が、付加情報を記録するグルーブ信号を生成する記録信号生成ステップと、
記録部が、前記記録信号生成ステップにおいて生成した記録信号をマスタディスクに記録する記録ステップを有し、
前記記録信号生成ステップは、
前記付加情報を構成する各ビット値に応じた位相誤差設定態様を決定し、
前記記録信号の所定区間単位で、前記付加情報を構成する各ビット値に応じた位相誤差を設定した記録信号を生成するステップを有する情報記録媒体製造方法にある。
情報再生装置において実行する情報再生方法であり、
再生部が、ディスクに記録されたグルーブ信号を読み取る再生ステップと、
信号解析部が、前記再生ステップにおける再生信号の解析を行う信号解析ステップを有し、
前記信号解析ステップは、
前記グルーブ信号に含まれる位相誤差方向を、所定信号区間単位で判別して判別結果に基づいて、前記グルーブ信号に含まれる付加情報の構成ビット値の判定を行うステップを有する情報再生方法にある。
情報記録装置において実行する情報記録方法であり、
再生部が、ディスクに記録されたグルーブ信号を読み取る再生ステップと、
信号解析部が、前記再生ステップにおいてディスクから読み取られたグルーブ信号に含まれる位相誤差方向を所定信号区間単位で判別し、判別結果に基づくビット値判定処理により前記グルーブ信号に重畳記録された暗号鍵構成ビット情報を解析する信号解析ステップと、
暗号処理部が、前記信号解析ステップにおいて解析した暗号鍵を適用してコンテンツの暗号化処理を実行する暗号処理ステップと、
記録部が、前記暗号処理ステップにおいて生成した暗号化コンテンツを前記ディスクに記録する記録ステップを有する情報記録方法にある。
情報再生装置において情報再生処理を実行させるプログラムであり、
再生部に、ディスクに記録されたグルーブ信号を読み取らせる再生ステップと、
信号解析部に、前記再生ステップにおける再生信号の解析を行わせる信号解析ステップを有し、
前記信号解析ステップは、
前記グルーブ信号に含まれる位相誤差方向を、所定信号区間単位で判別して判別結果に基づいて、前記グルーブ信号に含まれる付加情報の構成ビット値の判定を行わせるステップを有するプログラムにある。
情報記録装置において情報記録処理を実行させるプログラムであり、
再生部に、ディスクに記録されたグルーブ信号を読み取らせる再生ステップと、
信号解析部に、前記再生ステップにおいてディスクから読み取られたグルーブ信号に含まれる位相誤差方向を所定信号区間単位で判別させ、判別結果に基づくビット値判定処理により前記グルーブ信号に重畳記録された暗号鍵構成ビット情報を解析させる信号解析ステップと、
暗号処理部に、前記信号解析ステップにおいて解析した暗号鍵を適用してコンテンツの暗号化処理を実行させる暗号処理ステップと、
記録部に、前記暗号処理ステップにおいて生成した暗号化コンテンツを前記ディスクに記録させる記録ステップを有するプログラムにある。
1.記録媒体製造装置の構成と処理、および情報記録媒体について
2.情報再生装置の構成と処理について
3.情報記録装置の構成と処理について
4.その他の実施例について
まず、本発明の一実施例に係る記録媒体製造装置の構成と処理、および情報記録媒体について、図1以下を参照して説明する。
ビット[1]の場合、先行する+方向の位相誤差と後続する-方向の位相誤差の設定の組み合わせ、
ビット[0]の場合、先行する-方向の位相誤差と後続する+方向の位相誤差の設定の組み合わせ、
このような設定など、様々な設定が可能である。
位相誤差設定信号生成部123は、変調信号生成部122の生成した変調信号に対して付加情報ビットに応じた位相誤差情報に応じて、変調信号に位相誤差を設定した記録信号を生成する。
(1)位相誤差設定なしのグルーブ信号
(2a)+方向位相誤差設定グルーブ信号
(2b)-方向位相誤差設定グルーブ信号
ビット=1の場合に、+方向の位相誤差を設定したグルーブ信号、
ビット=0の場合に、-方向の位相誤差を設定したグルーブ信号、
このような設定でグルーブ信号を記録した場合の例を示している。
t1~t2:+方向位相誤差設定グルーブ信号(ビット値=1に対応)
t2~t3:-方向位相誤差設定グルーブ信号(ビット値=0に対応)
t3~t4:+方向位相誤差設定グルーブ信号(ビット値=1に対応)
t4~t5:+方向位相誤差設定グルーブ信号(ビット値=1に対応)
t5~t6:+方向位相誤差設定グルーブ信号(ビット値=0に対応)
このような設定で、グルーブ信号が生成されて記録される。
(1)位相誤差設定なしグルーブ信号
(2a)+方向位相誤差設定グルーブ信号
(2b)-方向位相誤差設定グルーブ信号
これらの3パターンの信号が記録される。
一定区間単位、例えば図4に示すt1~t2、t2~t3などの一定区間単位で、上記3パターンのいずれかの設定でグルーブ信号を記録する。
t1~t2:読み取りグルーブ信号に基づく位相誤差判定結果を蓄積(積分)し、+方向の位相誤差が設定された区間であると判断し、ビット値=[1]と判定する。
t2~t3:読み取りグルーブ信号に基づく位相誤差判定結果を蓄積(積分)し、-方向の位相誤差が設定された区間であると判断し、ビット値=[0]と判定する。
以下、同様の処理を実行して、ビットの値を順次、取得していく。
この処理を継続することで、例えば64ビットや128ビットの鍵を構成するビット値をすべて正確に取得することができる。
次に、上述した付加情報を重畳したグルーブ信号を記録したディスクの再生処理を行う再生装置の構成と処理例について説明する。
(1)位相誤差設定なしグルーブ信号
(2a)+方向位相誤差設定グルーブ信号
(2b)-方向位相誤差設定グルーブ信号
これらの3パターンの信号の混在したグルーブ信号である。
図6に示すように、信号解析部202は、復調部221、位相誤差検出部222、ビット値判定部223を有する。
復調部221は、FM変調信号としてディスクに記録されたグルーブ信号を再生部201から入力して復調処理を実行する。
(1)位相誤差設定なしグルーブ信号
(2a)+方向位相誤差設定グルーブ信号
(2b)-方向位相誤差設定グルーブ信号
これらの3パターンの信号が記録されている。
情報再生装置の位相誤差検出部222は、例えば図4に示すt1~t2、t2~t3などの一定区間単位で、上記3パターンのいずれの誤差設定のグルーブ信号であるかを判別する。
この処理の詳細について図7(2),(3)を参照して説明する。
例えば、図7(2)に示す例では、
サンプリング時間tp:計測値X1、
サンプリング時間tq:計測値X2、
これらの計測値が取得される。
なお、計測値は、グルーブの位置に応じた相対的な電位(電圧)の値として取得される。例えば、図7(2)に示すようにグルーブ信号の端から端までを-64~+64の相対電位値とした範囲で計測される。
すなわち、位相誤差指標値(Δτ)は下式(式1)に従って算出される。
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))・・・(式1)
ただし、
Xk-1はゼロクロス直前の計測値
Xkはゼロクロス直後の計測値
Yk-1,Ykは、
X≧0のときY=(+1)
X<0のときY=(-1)
である。
Th1<ΣΔτ<Th2 → 位相誤差なし
ΣΔτ≦Th1 → +方向位相誤差あり
ΣΔτ≧Th2 → -方向位相誤差あり
・・・・(式2)
上記判定式(式2)に従って、位相誤差の有無および方向の判定を実行する。
図8には、以下の3パターンの例を示している。
(1)位相誤差設定なしグルーブ信号
(2a)+方向位相誤差設定グルーブ信号
(2b)-方向位相誤差設定グルーブ信号
これらの3パターンの信号に対する信号区間t1~t2の位相誤差指標値(Δτ)の積分結果(ΣΔτ)と閾値(Th1,Th2)との比較処理例を示している。
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
上記式に従って、位相誤差指標値(Δτ)を算出して、その積分結果(ΣΔτ)=V0を算出した場合に相当する。
Th1<ΣΔτ<Th2 → 位相誤差なし
ΣΔτ<Th1 → +方向位相誤差あり
ΣΔτ>Th2 → -方向位相誤差あり
上記判定式に従って、位相誤差の有無および方向の判定が可能となる。
図9(a2),(a3)は、グルーブ信号のゼロクロス点の近傍の2つのパターンの拡大図である。
(a2)右下がりライン近傍の処理例、
(a3)右上がりライン近傍の処理例、
これらを示している。
なお、点線は、参考データとして示す位相誤差のないグルーブ信号の例である。
サンプリング時間tp:計測値c=+40、
サンプリング時間tq:計測値d=-26、
これらの計測値である。
位相誤差のないグルーブ信号(点線)の計測値は、
サンプリング時間tp:計測値a=+32、
サンプリング時間tq:計測値b=-32、
これらの計測値である。
実線、点線のラインの位置関係から、たとえば上記の計測値が取得される。
+方向の位相誤差を設定したグルーブ信号(実線)の計測値、
サンプリング時間tp:計測値c=+40、
サンプリング時間tq:計測値d=-26、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((-1)(+40))-((+1)(-26))=-14<0
このように0未満の値が算出される。
これは、図8(2a)に対応する。
サンプリング時間tp:計測値a=+32、
サンプリング時間tq:計測値b=-32、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((-1)(+32))-((+1)(-32))=0
このように0が算出される。
これは、図8(1)に対応する。
サンプリング時間tr:計測値g=-40、
サンプリング時間ts:計測値h=+26、
これらの計測値である。
位相誤差のないグルーブ信号(点線)の計測値は、
サンプリング時間tr:計測値e=-32、
サンプリング時間ts:計測値f=+32、
これらの計測値である。
実線、点線のラインの位置関係から、たとえば上記の計測値が取得される。
+方向の位相誤差を設定したグルーブ信号(実線)の計測値、
サンプリング時間tr:計測値g=-40、
サンプリング時間ts:計測値h=+26、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((+1)(-40))-((-1)(+26))=-14<0
このように0未満の値が算出される。
これは、図8(2a)に対応する。
サンプリング時間tp:計測値e=-32、
サンプリング時間tq:計測値f=+32、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((+1)(-32))-((-1)(+32))=0
このように0が算出される。
これは、図8(1)に対応する。
V1≦Th1
上記結果が得られた場合、この計測区間における位相誤差の設定は+方向(トラック進行方向)であると判別することができる。
図10(b2),(b3)は、グルーブ信号のゼロクロス点の近傍の2つのパターンの拡大図である。
(b2)右下がりライン近傍の処理例、
(b3)右上がりライン近傍の処理例、
これらを示している。
なお、点線は、参考データとして示す位相誤差のないグルーブ信号の例である。
サンプリング時間tp:計測値c=+26、
サンプリング時間tq:計測値d=-40、
これらの計測値である。
位相誤差のないグルーブ信号(点線)の計測値は、
サンプリング時間tp:計測値a=+32、
サンプリング時間tq:計測値b=-32、
これらの計測値である。
実線、点線のラインの位置関係から、たとえば上記の計測値が取得される。
-方向の位相誤差を設定したグルーブ信号(実線)の計測値、
サンプリング時間tp:計測値c=+26、
サンプリング時間tq:計測値d=-40、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((-1)(+26))-((+1)(-40))=+14>0
このように0より大きい値が算出される。
これは、図8(2b)に対応する。
サンプリング時間tp:計測値a=+32、
サンプリング時間tq:計測値b=-32、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((-1)(+32))-((+1)(-32))=0
このように0が算出される。
これは、図8(1)に対応する。
サンプリング時間tr:計測値g=-26、
サンプリング時間ts:計測値h=+40、
これらの計測値である。
位相誤差のないグルーブ信号(点線)の計測値は、
サンプリング時間tr:計測値e=-32、
サンプリング時間ts:計測値f=+32、
これらの計測値である。
実線、点線のラインの位置関係から、たとえば上記の計測値が取得される。
+方向の位相誤差を設定したグルーブ信号(実線)の計測値、
サンプリング時間tr:計測値g=-26、
サンプリング時間ts:計測値h=+40、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((+1)(-26))-((-1)(+40))=+14>0
このように0より大きい値が算出される。
これは、図8(2b)に対応する。
サンプリング時間tp:計測値e=-32、
サンプリング時間tq:計測値f=+32、
これらの計測値を適用すると、
Δτ=((Yk)(Xk-1))-((Yk-1)(Xk))
=((+1)(-32))-((-1)(+32))=0
このように0が算出される。
これは、図8(1)に対応する。
V2≧Th2
上記結果が得られた場合、この計測区間における位相誤差の設定は-方向(トラック逆方向)であると判別することができる。
グルーブ信号に重畳された付加情報が例えば暗号鍵である場合、ユーザの情報記録再生装置は、装着したディスクに記録されたグルーブ信号読み取り、暗号鍵を取得することができる。さらに、取得した暗号鍵を適用して、たとえばサーバから取得したコンテンツの暗号化処理を実行して、ディスクに記録することができる。
記録再生部301はディスク150からのグルーブ信号、記録コンテンツの読み取り、さらにコンテンツの記録処理を実行する。
グルーブ信号に対する付加情報の重畳記録におけるビット値に応じた位相誤差設定態様については、先に図4を参照して説明した構成の他、様々な設定が可能である。
ビット=1の場合に、+方向の位相誤差を設定したグルーブ信号、
ビット=0の場合に、-方向の位相誤差を設定したグルーブ信号、
このような設定でグルーブ信号を記録し、これらの位相誤差に基づいてビット値判別を行う例である。
ビット=1の場合に、先行する+方向位相誤差設定グルーブ信号と後続の-方向位相誤差設定グルーブ信号、
ビット=0の場合に、先行する-方向位相誤差設定グルーブ信号と後続の+方向位相誤差設定グルーブ信号、
このような設定でグルーブ信号を記録した例である。
t1~t2:+方向位相誤差設定グルーブ信号
t2~t3:-方向位相誤差設定グルーブ信号
このt1~t3区間のグルーブ信号によって、ビット値=1を示している。
t3~t4:-方向位相誤差設定グルーブ信号
t4~t5:+方向位相誤差設定グルーブ信号
このt3~t5区間のグルーブ信号によって、ビット値=0を示している。
t1~t2:読み取りグルーブ信号に基づく位相誤差判定結果を蓄積(積分)し、+方向の位相誤差が設定された区間であると判断する。
t2~t3:読み取りグルーブ信号に基づく位相誤差判定結果を蓄積(積分)し、-方向の位相誤差が設定された区間であると判断する。
このt1~t3区間において、先行する+方向位相誤差設定グルーブ信号と後続の-方向位相誤差設定グルーブ信号の組み合わせが検出されたことに基づいて、ビット値[1]と判定する。
t3~t4:読み取りグルーブ信号に基づく位相誤差判定結果を蓄積(積分)し、-方向の位相誤差が設定された区間であると判断する。
t4~t5:読み取りグルーブ信号に基づく位相誤差判定結果を蓄積(積分)し、+方向の位相誤差が設定された区間であると判断する。
このt3~t5区間において、先行する+方向位相誤差設定グルーブ信号と後続の-方向位相誤差設定グルーブ信号の組み合わせが検出されたことに基づいて、ビット値[0]と判定する。
[+][-][0][+][-][0][+][-][0][-][+]
このような信号を記録し[0]を区切り信号として利用する。
1110・・・・
上記ビット列であることの判別処理が可能となる。
[+][+][-]をビット値=1、
[-][-][+]をビット値=0、
とする設定など、多様な設定が可能である。
102 記録信号生成部
103 記録部
120 付加情報
122 変調信号生成部
123 位相誤差設定信号生成部
125 アドレス情報
130 マスタディスク
150 ディスク
201 再生部
202 信号解析部
204 復号処理部
221 復調部
222 位相誤差検出部
223 ビット値判定部
301 記録再生部
302 信号解析部
304 暗号処理部
Claims (16)
- 付加情報を記録するグルーブ信号を生成する記録信号生成部と、
前記記録信号生成部の生成した記録信号をマスタディスクに記録する記録部を有し、
前記記録信号生成部は、
前記付加情報を構成する各ビット値に応じた位相誤差設定態様を決定し、
前記記録信号の所定区間単位で前記付加情報を構成する各ビット値に応じた位相誤差を設定した記録信号を生成する記録媒体製造装置。 - 前記記録信号生成部は、
前記付加情報のビット値が0の場合と1の場合に応じて、前記グルーブ信号に設定する位相誤差の方向、または方向の組み合わせを異なる態様に設定した記録信号を生成する請求項1に記載の記録媒体製造装置。 - 前記付加情報は、前記ディスクに記録されるコンテンツの暗号化処理または復号処理に適用する暗号鍵を含む情報である請求項1または2に記載の記録媒体製造装置。
- ディスクに記録されたグルーブ信号を読み取る再生部と、
前記再生部の再生信号の解析を行う信号解析部を有し、
前記信号解析部は、
前記グルーブ信号に含まれる位相誤差方向を、所定信号区間単位で判別して判別結果に基づいて前記グルーブ信号に含まれる付加情報の構成ビット値の判定を行う構成である情報再生装置。 - 前記信号解析部は、
前記グルーブ信号のゼロクロス点の前後のサンプリング点の検出値を用いて位相誤差指標値を算出し、該位相誤差指標値を前記所定信号区間単位で積分して得られる結果と予め設定した閾値との比較により、前記所定信号区間における位相誤差の設定方向を判別する処理を行なう請求項4に記載の情報再生装置。 - 前記情報再生装置は、さらに、
前記信号解析部の解析した付加情報に含まれる暗号鍵を適用して、前記ディスクに記録された暗号化コンテンツの復号処理を行う復号処理部を有する請求項4または5に記載の情報再生装置。 - ディスクに記録されたグルーブ信号を読み取る再生部と、
前記再生部においてディスクから読み取られたグルーブ信号に含まれる位相誤差方向を所定信号区間単位で判別し、判別結果に基づくビット値判定処理により前記グルーブ信号に重畳記録された暗号鍵を解析する信号解析部と、
前記信号解析部の解析した暗号鍵を適用してコンテンツの暗号化処理を実行する暗号処理部と、
前記暗号処理部の生成した暗号化コンテンツを前記ディスクに記録する記録部を有する情報記録装置。 - 前記信号解析部は、
前記グルーブ信号のゼロクロス点の前後のサンプリング点の検出値を用いて位相誤差指標値を算出し、該位相誤差指標値を前記所定信号区間単位で積分して得られる結果と予め設定した閾値との比較により、前記所定信号区間における位相誤差の設定方向を判別する処理を行なう請求項7に記載の情報記録装置。 - 付加情報を記録するために利用されるグルーブ信号を記録した情報記録媒体であり、
前記グルーブ信号は、所定信号区間単位で付加情報の構成ビット値に応じた異なる態様の位相誤差が設定された付加情報重畳信号として記録され、
再生装置において前記位相誤差の設定態様の検出に基づいて前記付加情報を読み取ることを可能とした情報記録媒体。 - 前記グルーブ信号は、前記付加情報のビット値が0の場合と1の場合に応じて、前記グルーブ信号に設定する位相誤差の方向または方向の組み合わせを異なる態様に設定した信号である請求項9に記載の情報記録媒体。
- 前記付加情報は、前記ディスクに記録されるコンテンツの暗号化処理または復号処理に適用する暗号鍵を含む情報である請求項9または10に記載の情報記録媒体。
- 記録媒体製造装置において実行する情報記録媒体製造方法であり、
記録信号生成部が、付加情報を記録するグルーブ信号を生成する記録信号生成ステップと、
記録部が、前記記録信号生成ステップにおいて生成した記録信号をマスタディスクに記録する記録ステップを有し、
前記記録信号生成ステップは、
前記付加情報を構成する各ビット値に応じた位相誤差設定態様を決定し、
前記記録信号の所定区間単位で、前記付加情報を構成する各ビット値に応じた位相誤差を設定した記録信号を生成するステップを有する情報記録媒体製造方法。 - 情報再生装置において実行する情報再生方法であり、
再生部が、ディスクに記録されたグルーブ信号を読み取る再生ステップと、
信号解析部が、前記再生ステップにおける再生信号の解析を行う信号解析ステップを有し、
前記信号解析ステップは、
前記グルーブ信号に含まれる位相誤差方向を、所定信号区間単位で判別して判別結果に基づいて、前記グルーブ信号に含まれる付加情報の構成ビット値の判定を行うステップを有する情報再生方法。 - 情報記録装置において実行する情報記録方法であり、
再生部が、ディスクに記録されたグルーブ信号を読み取る再生ステップと、
信号解析部が、前記再生ステップにおいてディスクから読み取られたグルーブ信号に含まれる位相誤差方向を所定信号区間単位で判別し、判別結果に基づくビット値判定処理により前記グルーブ信号に重畳記録された暗号鍵構成ビット情報を解析する信号解析ステップと、
暗号処理部が、前記信号解析ステップにおいて解析した暗号鍵を適用してコンテンツの暗号化処理を実行する暗号処理ステップと、
記録部が、前記暗号処理ステップにおいて生成した暗号化コンテンツを前記ディスクに記録する記録ステップを有する情報記録方法。 - 情報再生装置において情報再生処理を実行させるプログラムであり、
再生部に、ディスクに記録されたグルーブ信号を読み取らせる再生ステップと、
信号解析部に、前記再生ステップにおける再生信号の解析を行わせる信号解析ステップを有し、
前記信号解析ステップは、
前記グルーブ信号に含まれる位相誤差方向を、所定信号区間単位で判別して判別結果に基づいて、前記グルーブ信号に含まれる付加情報の構成ビット値の判定を行わせるステップを有するプログラム。 - 情報記録装置において情報記録処理を実行させるプログラムであり、
再生部に、ディスクに記録されたグルーブ信号を読み取らせる再生ステップと、
信号解析部に、前記再生ステップにおいてディスクから読み取られたグルーブ信号に含まれる位相誤差方向を所定信号区間単位で判別させ、判別結果に基づくビット値判定処理により前記グルーブ信号に重畳記録された暗号鍵構成ビット情報を解析させる信号解析ステップと、
暗号処理部に、前記信号解析ステップにおいて解析した暗号鍵を適用してコンテンツの暗号化処理を実行させる暗号処理ステップと、
記録部に、前記暗号処理ステップにおいて生成した暗号化コンテンツを前記ディスクに記録させる記録ステップを有するプログラム。
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JP2001357533A (ja) * | 1999-07-07 | 2001-12-26 | Matsushita Electric Ind Co Ltd | 光ディスク、その記録装置、記録方法及び再生装置 |
WO2002021518A1 (fr) * | 2000-09-01 | 2002-03-14 | Matsushita Electric Industrial Co., Ltd. | Disque optique, lecture et enregistrement de disque optique |
JP2004213781A (ja) * | 2003-01-06 | 2004-07-29 | Sony Corp | マスタリング装置、ディスク製造方法、ディスク状記録媒体、ディスク再生装置、ディスク再生方法 |
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CN102473427A (zh) | 2012-05-23 |
US8570847B2 (en) | 2013-10-29 |
US20120147723A1 (en) | 2012-06-14 |
JP2011023051A (ja) | 2011-02-03 |
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