WO2003105151A1 - ディスク記録媒体、ディスク製造方法、ディスクドライブ装置 - Google Patents
ディスク記録媒体、ディスク製造方法、ディスクドライブ装置 Download PDFInfo
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- WO2003105151A1 WO2003105151A1 PCT/JP2003/007410 JP0307410W WO03105151A1 WO 2003105151 A1 WO2003105151 A1 WO 2003105151A1 JP 0307410 W JP0307410 W JP 0307410W WO 03105151 A1 WO03105151 A1 WO 03105151A1
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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
- G11B7/007—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
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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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
-
- 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
- G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
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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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
- H03M13/2906—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes using block codes
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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
-
- 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
- G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
- G11B2020/10888—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing the kind of data being the selection criterion
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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
- G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
- G11B2020/1238—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located
- G11B2020/1239—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located the track being a pregroove, e.g. the wobbled track of a recordable optical disc
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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
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1267—Address data
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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
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1267—Address data
- G11B2020/1271—Address data the address data being stored in a subcode, e.g. in the Q channel of a CD
- G11B2020/1272—Burst indicator subcode [BIS]
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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
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1287—Synchronisation pattern, e.g. VCO fields
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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
- G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
- G11B2020/1836—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information using a Reed Solomon [RS] code
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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
- G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
- G11B2220/215—Recordable discs
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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
- G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
- G11B2220/215—Recordable discs
- G11B2220/216—Rewritable discs
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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
- Disk recording medium Disk manufacturing method, disk drive device
- the present invention relates to a disk recording medium such as an optical disk, a disk manufacturing method for manufacturing the disk recording medium, and a disk drive device for the disk recording medium.
- CD Compact Disc
- MD Mini-Disc
- DVD Digital
- optical disks including magneto-optical disks
- An optical disk is a general term for recording media that irradiates laser light onto a disk made of a thin metal plate protected by plastic and reads signals by changing the reflected light.
- optical disks There are two types of optical disks: read-only type, for example, known as CD, CD-ROM, DVD-ROM, MD, CD-R, CD-RW, DVD-R, DVD-RW, DVD + Some types can record user data as is known in RW, DVD-RAM, etc.
- the recordable type can record data by using a magneto-optical recording method, a phase change recording method, a dye film change recording method, or the like.
- the dye film change recording method is also called a write-once recording method, which is suitable for data storage and the like because data can be recorded only once and cannot be rewritten.
- the magneto-optical recording method and the phase change recording method can rewrite data. It is used for various purposes including recording various content data such as music, video, games, and application programs.
- DVR Data & Video Record
- a guide means for tracking a data track is required.
- a groove is formed in advance as a pre-group, and a group or a land (a cross-section plateau-like portion sandwiched between the groups) is used as a data track.
- the track for recording the data is preliminarily formed as a pre-group, for example, and the side wall of the pre-group is wobbled in accordance with the address information.
- the address can be read from the wobbling information obtained as the reflected light information. For example, even if pit data or the like indicating the address is not previously formed on the track, a desired address can be obtained. Data can be recorded and reproduced at the position.
- High reliability is required because, for example, if the attribute and additional information for control cannot be obtained accurately, it will be impossible to execute the control operation such as obtaining the optimum recording conditions on the user's device. It is.
- the depth of the group For high-density recording / reproduction on an optical disk, it is necessary to reduce the depth of the group. It is very difficult to make the depth of the group and the embossed bit different from each other for the discs that produce the group and the embossed bit at the same time by the stamper. For this reason, the depth of the front boss pit must be the same as the depth of the group.
- the phase change mark is recorded / reproduced on a spirally formed group on the disk, but the depth of the group is about 2 to reduce media noise for high density.
- 0 nm, that is, ⁇ / 13 to ⁇ / 12 is desirable for the wavelength ⁇ .
- the embossing depth is preferably ⁇ 8 to ⁇ ⁇ 4. The solution could not be obtained.
- an object of the present invention is to perform appropriate recording as additional information pre-recorded together with address information and to increase reliability.
- the disk recording medium of the present invention is capable of recording / reproducing the first data in a rewritable or write-once recording method and reproducing the second data recorded by group coupling.
- the second data includes address information and additional information, the additional information is encoded by a first error correction method, and the encoded additional information and the address are further encoded.
- Information is recorded in a state encoded by the second error correction method.
- the first error correction method is the same error correction method as the error correction method applied to the first data.
- the error correction encoding of the additional information is performed by adding (m ⁇ n) dummy data to the additional information in units of m smaller than the code length n in the error correction encoding of the first data. Is added to the error correction code as code length n.
- the additional information is recorded at least in a lead-in area in the recording / reproducing area.
- the disc manufacturing method of the present invention is a method of manufacturing a disc recording medium provided with a recording / reproducing area for recording / reproducing first data in a rewritable or write-once recording method. Coded by the second error correction method, and the encoded additional information and address information were coded by the second error correction method to form second data, and coupled based on the second data.
- the recording / reproducing area is formed by forming the group in a spiral shape.
- the first error correction method is the same error correction method as the error correction method applied to the first data.
- the error correction coding of the additional information is performed by adding (m ⁇ n) dummy data to the additional information in units of m smaller than the code length n in the error correction coding of the first data. To correct the error as a code length n.
- the additional information is recorded at least in a portion that is a lead-in area in the recording and reproduction area.
- the disk drive device of the present invention is a disk drive device for recording or reproducing data on or from the disk recording medium, wherein a read operation for reading the second data from the coupled group of the disk recording medium is performed. And performing error correction decoding by the second error correction method on the second data read by the reading means to obtain the address information and the first error correction method.
- Additional information decoding means for performing error correction decoding according to a method to obtain additional information.
- the first error correction method is the same error correction method as the error correction method performed on the first data, and the additional information decoding means includes the first error correction method. Error correction decoding and error correction encoding for evening are also performed.
- the additional information decoding means adds (m ⁇ n) dummy data to the additional information in units of m smaller than the code length n in the error correction coding of the first data. Error correction decoding is performed with code length n.
- the additional information is obtained from the second data read by the reading means in a lead-in area in the recording / reproducing area. That is, according to the present invention, when the additional information is previously recorded on a large-capacity write-once or rewritable disc, the additional information is recorded by wobbling the address information together with the glove. Further, the additional information is encoded by the first error correction method, and the grooving is performed by the second data obtained by encoding the encoded additional information and address information by the second error correction method. Thereby, additional information can be recorded together with the address information by the wobbling dull. Further additional information Nitsu There First, the second error one correction good / the gill one correction encoded are Shito doubly method 0 BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is an explanatory diagram of a disk dub according to an embodiment of the present invention.
- FIG. 2 is an explanatory diagram of coupling of a disk group according to an embodiment.
- FIG. 3 is an explanatory diagram of a wobble signal subjected to MSK modulation and HMW modulation according to the embodiment.
- FIG. 4A to 4E are explanatory diagrams of the MSK modulation according to the embodiment.
- FIG. 5 is a block diagram of an MSK demodulation circuit that demodulates the MSK modulated signal according to the embodiment.
- FIG. 6 is a waveform diagram of an input wobble signal and a synchronous detection output signal according to the embodiment.
- FIG. 7 is an integrated output value of the synchronous detection output signal of the MSK stream, a hold value of the integrated output value, and a waveform diagram of the MSK demodulated modulated data according to the embodiment.
- FIG. 8A to 8C are explanatory diagrams of the HMW modulation according to the embodiment.
- FIG. 9 is a block diagram of an HMW demodulation circuit that demodulates the HMW modulated signal according to the embodiment.
- FIG. 10 is a waveform diagram of the reference carrier signal, the modulated data, and the second harmonic signal waveform generated according to the modulated data of the embodiment.
- FIG. 11 is a waveform diagram of the generated HMW stream according to the embodiment.
- FIGS. 12A to 12B show the synchronous detection output signal of the HMW stream, the integrated output value of the synchronous detection output signal, the hold value of the integrated output value, and the HMW demodulated modulated data of the embodiment.
- FIG. 12A shows the synchronous detection output signal of the HMW stream, the integrated output value of the synchronous detection output signal, the hold value of the integrated output value, and the HMW demodulated modulated data of the embodiment.
- FIG. 13 is an explanatory diagram of a disk layout according to the embodiment.
- FIG. 14A to FIG. 14B are explanatory diagrams of the PB zone and RW zone wobbling of the embodiment.
- FIG. 15 is an explanatory diagram of a modulation method of prerecorded information according to the embodiment.
- FIG. 16 is an explanatory diagram of an ECC structure of a phase change mark according to the embodiment.
- FIG. 17 is an explanatory diagram of an ECC structure of prerecorded information according to the embodiment.
- FIG. 18A to FIG. 18B are explanatory diagrams of a frame structure of the phase change mark and the pre-recorded information according to the embodiment.
- FIGS. 19A to i9B are explanatory diagrams of the relationship between the RUB and the address unit of the disk of the embodiment and the bit blocks constituting the address unit.
- FIG. 20 is an explanatory diagram of the sink part of the address pendant of the embodiment.
- FIGS. 21A to 21B are illustrations of monotone bits and modulated data in the sync part according to the embodiment.
- FIGS. 22A to 22B are explanatory diagrams of the signal waveform of the first sync bit and the modulated data in the sync part of the embodiment.
- FIGS. 23A to 23B are explanatory diagrams of a signal waveform of a second sync bit and modulated data in the sync part according to the embodiment.
- FIGS. 24A to 24B are explanatory diagrams of the signal waveform of the third sync bit and the modulated data in the sync part according to the embodiment.
- FIGS. 25A to 25B are explanatory diagrams of the signal waveform of the fourth sync bit and the modulated data in the sync part according to the embodiment.
- PC leak 3/0 so-called
- FIG. 26 is an explanatory diagram of the bit configuration of the data part in the address unit according to the embodiment.
- FIGS. 27A to 27C are explanatory diagrams of the signal waveform of the ADIP bit representing the bit “1” of the data part and the modulated data according to the embodiment.
- FIGS. 28A to 28 FIG. C is an explanatory diagram of the signal waveform of the ADIP bit representing the bit “0” of the data part of the embodiment and the modulated data.
- FIG. 29 is an explanatory diagram of the address format of the embodiment. .
- FIG. 30 is an explanatory diagram of the contents of address information by the ADIP bit according to the embodiment.
- FIG. 31 is a block diagram of an address demodulation circuit according to the embodiment.
- FIG. 32A to FIG. 32E are explanatory diagrams of control timing of the address demodulation circuit of the embodiment.
- FIG. 33A to FIG. 33C are waveform diagrams of signals when HMW demodulation is performed by the address demodulation circuit according to the embodiment.
- FIG. 34A to FIG. 34C are waveform diagrams of signals when HMW demodulation is performed by the address demodulation circuit of the embodiment.
- FIG. 35 is an explanatory diagram of the disk information according to the embodiment.
- FIG. 36 is an explanatory diagram of an ECC format of main data according to the embodiment.
- FIG. 37 is an explanatory diagram of an ECC format of disc information according to the embodiment.
- FIG. 38 is a block diagram of the disk drive device of the embodiment.
- FIG. 39 is a block diagram of the mastering device of the embodiment.
- BEST MODE FOR CARRYING OUT THE INVENTION an optical disk as an embodiment of the present invention will be described, and a disk drive device (recording / reproducing device) that performs recording and reproduction corresponding to the optical disk, and a mastering device for manufacturing the optical disk will be described. The description will be made in the following order.
- a group GV serving as a recording track is formed.
- This group GV It is formed in a spiral shape from the peripheral side to the outer peripheral side. Therefore, looking at the cut surface of the optical disk 1 in the radial direction, as shown in FIG. 2, convex land L and concave group GV are formed alternately.
- the group GV of the optical disc 1 is meandering in the tangential direction.
- the meandering shape of this group GV is a shape according to the pebble signal. Therefore, the optical disk drive detects the position of both edges of the group GV from the reflected light of the laser spot LS irradiated on the group GV, and moves the laser spot LS along the recording track. By extracting a fluctuation component of the position in the radial direction of the disc, a wobble signal can be reproduced.
- the address information (physical address, other additional information, etc.) of the recording track at the recording position is modulated on the wobble signal. Therefore, the optical disk drive can perform address control and the like at the time of data recording and reproduction by demodulating address information and the like from the wobble signal.
- an optical disc on which group recording is performed will be described.
- the present invention is not limited to such an optical disc of group recording, and is applicable to an optical disc for performing land recording for recording data on lands.
- the present invention can be applied to an optical disc of land group recording in which data is recorded in a group and a land.
- address information is modulated with respect to a wobble signal by using two modulation methods.
- One is an MSK (Minimum Shift Key Ing) modulation method.
- the other method is to add an even-order harmonic signal to a sine-wave carrier signal and modulate it by changing the polarity of the harmonic signal according to the sign of the data to be modulated. It is.
- a modulation method in which an even-order harmonic signal is added to a sine-wave carrier signal and the polarity of the harmonic signal is changed according to the sign of the data to be modulated is referred to as HMW ( HarMonic Wave) Modulation.
- a block in which a sine wave reference carrier signal waveform of a predetermined frequency is continuous for a predetermined period forms a block.
- MSK-modulated address information is stored.
- a wobble signal including an MSK modulation unit to be input and an HMW modulation unit to receive HMW-modulated address information is generated. That is, the MSK-modulated address information and the HMW-modulated address information are inserted at different positions in the block.
- one of the two sine-wave carrier signals used in the MSK modulation and the HMW-modulated carrier signal are used as the reference carrier signals.
- the MSK modulator and the HMW modulator are arranged at different positions in the block, and a reference carrier signal of one cycle or more is arranged between the MSK modulator and the HMW modulator. It shall be.
- a portion in which no data is modulated and only the frequency component of the reference carrier signal appears is hereinafter referred to as a monotone signal.
- the sine wave signal used as the reference carrier signal is C os (ct).
- One cycle of the reference carrier signal is called one wobble cycle.
- the frequency of the reference carrier signal is constant from the inner circumference to the outer circumference of the optical disc 1 and is determined according to the relationship with the linear velocity when the laser spot moves along the recording track.
- MSK modulation Hereinafter, the modulation methods of the MSK modulation and the HMW modulation will be described in further detail. First, a modulation method of address information using the MSK modulation method will be described.
- MSK modulation uses FSK (Frequency Shift
- the modulation index of the modulation is 0.5.
- the FSK modulation is a method of modulating two carrier signals of a frequency f1 and a frequency ⁇ 2 by associating “0” and “1” of the code of the data to be modulated, respectively. That is, if the modulated data is "0", a sine wave waveform with frequency f1 is output. If the modulated data is "1", a sine wave waveform with frequency f1 is output. Further, in the case of the FSK modulation in which the phases are continuous, the phases of the two carrier signals are continuous at the timing of the code switching of the modulated data.
- a modulation index m is defined. This modulation index m is
- T is the transmission rate of the modulated data (1 / the time of the shortest code length).
- MSK modulation The phase continuous FSK modulation when m is 0.5 is called MSK modulation.
- the shortest code length L of the modulated data to be subjected to MSK modulation is set to two periods of the pebble period as shown in FIGS. 4A and 4B.
- the shortest code length L of the modulated data may be any length as long as the period is at least twice the period of the pebble and an integral multiple.
- One of the two frequencies used for the MSK modulation has the same frequency as the reference carrier signal, and the other has a frequency 1.5 times that of the reference carrier signal. That is, one of the signal waveforms used for MSK modulation is C os (co t) Or one C 0 s ( ⁇ t), and the other is C os (1.5 ⁇ t) or one C os (1.5 ⁇ t).
- the clock unit corresponding to the sample period is applied to the data stream of the modulated data.
- Perform differential encoding processing That is, the difference between the stream of the modulated data and the delayed data delayed by one cycle of the reference carrier signal is calculated.
- the data that has been subjected to the differential encoding processing is referred to as precode data.
- the precode data is subjected to MSK modulation to generate an MSK stream.
- the signal waveform of this MSK stream has a waveform (C os ( ⁇ t)) having the same frequency as the reference carrier or its inverted waveform (one C C). os (t)), and when the precode data is “1”, the waveform of the frequency 1.5 times that of the reference carrier (C os (1.5 ⁇ t)) or its inverted waveform (one C os (1.5 ⁇ t)). Therefore, for example, if the data sequence of the modulated data has a pattern of “0 1 0” as shown in FIG.
- the signal waveform of the MSK stream will be as shown in FIG. 4E.
- a waveform such as Cos (wt), Cos (wt), Cos (1.5wt), -Cos (wt), -Cos (1.5wt), and Cos (wt) is obtained every one wobble period.
- address information is modulated into the wobble signal by converting the wobble signal into the above-described MSK stream.
- a bit is set (to "1") at the code change point of the modulated data.
- the code length of the modulated data is The reference carrier signal (C os ( ⁇ t)) or its inverted signal (one C os (co t)) is always inserted in the latter half of the code length of the modulated data because the period is twice or more the period. Will be done.
- C os ( ⁇ t) The reference carrier signal
- one C os (co t) is always inserted in the latter half of the code length of the modulated data because the period is twice or more the period. Will be done.
- the bit of the precode data becomes "1"
- a waveform with a frequency 1.5 times that of the reference carrier signal is inserted, and the waveforms are connected at the code switching point with the same phase. Therefore, the signal waveform inserted into the second half of the code length of the modulated data must be the reference carrier signal waveform if the modulated data is "0".
- the synchronous detection output has a positive value if the phase matches the carrier signal, and has a negative value if the phase is inverted. If synchronous detection is performed using a reference carrier signal, demodulated data can be demodulated.
- FIG. 5 shows an MSK demodulation circuit that demodulates modulated data from the MSK stream as described above.
- the 1 ⁇ 311 demodulation circuit 10 includes a PLL circuit 11, a timing generator (TG) 12, a multiplier 13, a multiplier 14, a sample / hold (SH ) A circuit 15 and a slice circuit 16 are provided.
- the PLL circuit 11 receives a wobble signal (MSK modulated stream).
- the PLL circuit 11 generates an edge from the input Detects the component and generates a clock that is synchronized with the reference carrier signal (C os (co t)).
- the generated clock is supplied to the timing generator 12.
- the timing generator 12 generates a reference carrier signal (C os (co t)) synchronized with the input wobble signal.
- the timing generator 12 generates a clear signal (CLR) and a hold signal (HOLD) from the clock signal.
- the clear signal (CLR) is a signal that is generated at a timing that is delayed by a 1 / 2-wobble period from the start edge of the data clock of the modulated data for which the minimum code length is 2 of the wobble periods.
- the hold signal (HOLD) is a signal that is generated at a timing delayed by a 1/2 wobble cycle from the end edge of the data clock of the modulated data.
- the reference carrier signal (C os ( ⁇ t)) generated by the timing generator 12 is supplied to the multiplier 13.
- the generated clear signal (CLR) is supplied to the integrator 14.
- the generated hold signal (HOLD) is supplied to the sample Z hold circuit 15.
- the multiplier 13 multiplies the input wobble signal by the reference carrier signal (C os ( ⁇ t)) to perform synchronous detection processing.
- the synchronously detected output signal is supplied to an integrator 14.
- the integrator 14 performs an integrating process on the signal synchronously detected by the multiplier 13.
- the integrator 14 clears the integrated value to 0 at the generation timing of the clear signal (CLR) generated by the timing generator 12.
- the sample / hold circuit 15 samples the integrated output value of the integrator 14 at the timing of the generation of the hold signal (HOLD) generated by the evening generator 12, and generates the next hold signal (HOLD). Until then, hold the sampled value.
- the slice circuit 16 binarizes the value held by the sample / hold circuit 15 using the origin (0) as a threshold, inverts the sign of the value, and outputs the result.
- the output signal from the slice circuit 16 becomes the demodulated modulated data.
- FIGS. 6 and 7 show a wobble signal (MSK stream) generated by performing the above-described MSK modulation on the modulated data of the data sequence “0100”, and FIG. FIG. 9 shows output signal waveforms from each circuit when a wobble signal is input to the MSK demodulation circuit 10.
- the horizontal axis (n) in FIGS. 6 and 7 indicates the cycle number of the cobbled cycle.
- FIG. 6 shows an input wobble signal (MSK stream) and a synchronous detection output signal (MSKXCos ( ⁇ t)) of this wobble signal.
- FIG. 7 shows the integrated output value of the synchronous detection output signal, the hold value of the integrated output value, and the demodulated modulated data output from the slice circuit 16. The reason why the demodulated modulated data output from 6 is delayed is due to the processing delay of the integrator 14.
- the address information subjected to the MSK modulation as described above is included in the wobble signal.
- the address information is subjected to the MSK modulation and included in the wobble signal, so that the high-frequency component included in the wobble signal is reduced. Therefore, accurate address detection can be performed.
- the MSK-modulated address information is inserted into a monotone record, crosstalk given to an adjacent track can be reduced, and S / N can be improved.
- MSK-modulated data can be synchronously detected and demodulated, demodulation of a wobble signal can be performed accurately and easily.
- the HMW modulation modulates a digital code by adding an even-order harmonic signal to a sinusoidal carrier signal as described above and changing the polarity of the harmonic signal according to the sign of the data to be modulated.
- This is a modulation method.
- the carrier signal of the HMW modulation is a signal having the same frequency and phase as the reference carrier signal (Cos ( ⁇ t)) which is the carrier signal of the MS MS modulation.
- the added even-order harmonic signals are S in (2 ⁇ t) and one S in (2 co t), which are the second harmonics of the reference carrier signal (C os ( ⁇ t)), and the amplitude is However, the amplitude of the reference carrier signal is set to be 12 dB.
- the minimum code length of the modulated data is twice as long as the pebble period (period of the reference carrier signal).
- FIGS. 8A to 8C show signal waveforms when the wobble signal is modulated by the above method.
- FIG. 8A shows the signal waveform of the reference carrier signal (C os (ot)).
- FIG. 8B shows a signal waveform obtained by adding S in (2 ⁇ t) to the reference carrier signal (C os ( ⁇ t)), that is, a signal waveform when the modulated data is “1”. Is shown.
- FIG. 8C shows the signal waveform obtained by adding one Sin (2 ⁇ t) to the reference carrier signal (C os ( ⁇ t)), that is, the signal waveform when the modulated data is “0”. Is shown. 0307410
- the harmonic signal added to the carrier signal is the second harmonic, but the harmonic signal is not limited to the second harmonic, and any signal may be added as long as it is an even harmonic. . Further, in the optical disc 1, only the second harmonic is added, but a plurality of harmonic signals may be added simultaneously, such as adding both the second harmonic and the fourth harmonic simultaneously.
- FIG. 9 shows an HMW demodulation circuit that demodulates modulated data from the above-described HMW-modulated signal.
- the HMW demodulation circuit 20 includes a PLL circuit 21, a timing generator (TG) 22, a multiplier 23, an integrator 24, and a sample Z hold (SH).
- TG timing generator
- SH sample Z hold
- a circuit 25 and a slice circuit 26 are provided.
- a wobble signal (HMW-modulated stream) is input.
- the PLL circuit 21 detects an edge component from the input wobble signal and generates a wobble clock synchronized with the reference carrier signal (Cos (cot)).
- the generated poker bag is supplied to the timing generator 22.
- the evening timing generator 22 generates a second harmonic signal (S in (2 ⁇ t)) synchronized with the input wobble signal.
- the timing generator 22 generates a clear signal (CLR) and a hold signal (HOLD) from the wobble clock.
- the clear signal (CLR) is a signal generated at the timing of the start edge of the data clock of the modulated data in which the minimum code length is two of the pebble periods. Also hold signal JP03 / 07410
- HOLD is a signal generated at the timing of the end edge of the data clock of the modulated data.
- the second harmonic signal (S in (2 ⁇ t)) generated by the timing generator 22 is supplied to a multiplier 23.
- the generated clear signal (CLR) is supplied to an integrator 24. You.
- the generated hold signal (HOLD) is supplied to the sample / hold circuit 25.
- the multiplier 23 performs a synchronous detection process by multiplying the input wobble signal by the second harmonic signal (S in (2 ⁇ t)).
- the synchronously detected output signal is supplied to an integrator 24.
- the integrator 24 performs an integration process on the signal synchronously detected by the multiplier 23.
- the integrator 24 clears the integrated value to 0 at the generation timing of the clear signal (CLR) generated by the timing generator 22.
- the sample Z hold circuit 25 samples the integrated output value of the integrator 24 at the generation timing of the hold signal (HOLD) generated by the timing generator 22 and waits until the next hold signal (HOLD) is generated. To hold the sampled value.
- the slice circuit 26 binarizes the value held by the sample Z hold circuit 25 using the origin (0) as a threshold and outputs the sign of the value.
- the output signal from the slice circuit 26 becomes demodulated data to be modulated.
- FIGS. 10, 11 and FIGS. 12A to 12B are used when the above-described HMW modulation is performed on the modulated data of the data string “11010”.
- a signal waveform, a hobble signal generated by the HMW modulation, and each of the circuits when the hobble signal is input to the HMW demodulation circuit 20. 5 shows an output signal waveform of the first embodiment.
- the horizontal axis (n) in FIGS. 10 to 12B indicates the cycle number of the pebble cycle.
- FIG. 10 shows a reference carrier signal (C os (ct)), modulated data in a data string of “110 10”, and a second harmonic signal waveform generated according to the modulated data ( Sin (2 ⁇ t),-1 2 d B).
- FIG. 11 shows the generated wobble signal (HMW stream).
- FIG. 12A shows a synchronous detection output signal (HMWX S in (2 ⁇ t)) of the wobbled signal.
- FIG. 12B shows an integrated output value of the synchronous detection output signal, a hold value of the integrated output value, and demodulated modulated data output from the slice circuit 26. The reason why the demodulated modulated data output from the slice circuit 26 is delayed is because of the primary delay of the integrator 14.
- the address information subjected to the HMW modulation as described above is included in the wobble signal.
- the frequency component can be limited, and the high frequency component can be reduced. Therefore, the SZN of the demodulated output of the wobble signal can be improved, and accurate address detection can be performed.
- the modulation circuit can be composed of a carrier signal generation circuit, a harmonic component generation circuit thereof, and an addition circuit of these output signals, which is very simple. In addition, since the high frequency component of the wobble signal is reduced. Mastering during optical disc molding is also facilitated.
- this optical disc 1 0 since the HMW-modulated address information is inserted into a monotone table, crosstalk given to an adjacent track can be reduced, and SZN can be improved. Also, this optical disc 1 0
- the optical disc 1 of the present embodiment employs the MSK modulation method and the HMW modulation method as the modulation method of the address information for the wobble signal.
- one of the frequencies used in the MSK modulation method and the carrier frequency used in the HMW modulation are sine wave signals (Cos (cot)) having the same frequency.
- the signal of the frequency used in the MSK modulation and the harmonic signal used in the HMW modulation do not interfere with each other. Insensitive to ingredients. Therefore, it is possible to reliably detect each piece of address information recorded by the two modulation methods. Therefore, it is possible to improve the accuracy of the control of the track position and the like in the recording and reproduction of the optical disk.
- the address information recorded by the MSK modulation and the address information recorded by the HMW modulation have the same data content, the address information can be more reliably detected.
- one of the frequencies used in the MSK modulation method and the carrier frequency used in the HMW modulation are the same frequency sine wave signal (C os (co t)). Since MSK modulation and HMW modulation are performed on different parts of the wobble signal, at the time of modulation, for example, for the wobble signal after MSK modulation, the It is only necessary to add the harmonic signal to the input signal, and it is possible to perform two modulations very easily. In addition, by applying MSK modulation and HMW modulation to different parts of the wobble signal, and including at least one cycle of the monotonous wobble between the two, disc manufacturing can be performed more accurately. Also, the address can be reliably demodulated.
- DVR Data & Video Recording
- the optical disk used as the DVR disk in this example is an optical disk that performs recording overnight in a phase change method, and has a diameter of 120 mm.
- the disc thickness is 1.2 mm. In other words, these points are similar to a CD (Compact Disc) type disc and a DVD (Digital Versatile Disc) type disc when viewed from the outside.
- CD Compact Disc
- DVD Digital Versatile Disc
- the laser wavelength for recording Z reproduction is set to 405 nm, and a so-called blue laser is used.
- the NA of the optical system is 0.85.
- the track on which the phase change mark (phase change mark) is recorded has a track pitch of 0.32 m and a linear density of 0.
- a 64 KB data pro and Soku are used as one recording and playback unit, The rate is about 82%, and a user data capacity of 23.3 Gbytes is realized on a disk with a diameter of 12 cm.
- the overnight recording is a group recording method.
- Fig. 13 shows the layout (area configuration) of the entire disk.
- a lead-in zone, data zone, and lead-out zone are arranged from the inner circumference side.
- the inner circumference of the lead-in zone is the PB zone (playback only area), and the area from the outer circumference of the lead-in zone to the lead-out zone is the RW zone (recording and playback area).
- the lead-in zone is located inside a radius of 24 mm.
- the radius of 21 to 22.2 mm is defined as BCA (Burst Cutting Area).
- BCA is a recording of a unique ID unique to a disc recording medium by a recording method for burning out the recording layer.
- the recording marks are formed so as to be arranged concentrically, thereby forming a barcode-shaped recording data.
- the radius 22.2 to 23.1 mm is the pre-recorded dead data zone.
- the pre-recorded data zone records in advance disk information such as recording / playback conditions, copy protection information, etc. (pre-recorded information) by wobbling spirally formed groups on the disc. I have.
- the BCA and pre-recorded dead data zone are the above-mentioned PB zone (play-only area).
- copy protection information is included as pre-recorded information in the pre-recorded dead zone, and the following is performed using this copy protection information.
- the registered drive device manufacturer and the disk manufacturer can conduct business and have a media key or a drive key indicating that the drive device has been registered.
- the drive key or media key is recorded as copy protection information.
- the media or drive having the media key and the drive key can be prevented from recording and reproducing by this information.
- a test write area OPC and a defect management area DMA are provided at a radius of 23.1 to 24 mm, and a test write area ⁇ PC is used to record phase change marks such as laser power during recording / reproduction. Used for trial writing when setting recording and playback conditions.
- the difference management area DMA records and reproduces information for managing the difference information on the disc.
- a radius of 24.0 to 58.0 mm is a data zone.
- the data zone is the area where user data is actually recorded and reproduced by the phase change mark.
- a radius of 58.0 to 58.5 mm is a lead-out zone.
- the read-out zone is provided with the same defect management area as the lead-in zone, and is used as a buffer area so that it can be over-run at the time of seeking.
- the radius of 23.1 mm that is, the area from the test write area to the readout zone is the RW zone (recording / playback area) where the phase change mark is recorded and played back.
- Figures 14A to 14B show the tracks in the RW zone and the PB zone.
- Figure 14A shows group coupling in the RW zone.
- FIG. 14B shows the wobbling of the group in the pre-recorded dead zone of the PB zone.
- address information is previously formed by doubling a dull formed in a spiral shape on a disk in order to perform tracking.
- Information is recorded / reproduced to / from the group that has formed the address information using a phase change mark.
- phase change mark On this track, a recording mark is recorded by a phase change mark, but the phase change mark is RLL (1, 7) P P modulation (RL L; Run Length Limited, P P :: Parity
- the mark length is 2 ⁇ ⁇ from 2 T and the shortest mark length is 2 ⁇ .
- the address information has a wobbling cycle of 69 ° and a wobbling amplitude WA of about 20 nm (p-p).
- the address information and the phase change mark are arranged so that their frequency bands do not overlap, so that each detection is not affected.
- the CNR (carrier noise ratio) of the address information wobbling is 30 dB after recording when the bandwidth is 30 KHz, and the address error level Ichito the articulating (disk skew, defocus, disturbances, etc.) is less than 1 X 1 0- 3, including the effects of.
- the track by the dub in the PB zone in FIG. 14B has a wider track pitch and a larger wobbling amplitude than the track by the group in the RW zone in FIG. 14A.
- the track pitch TP is 0.35 m
- the wobbling period is 36 T
- the wobbling amplitude WA is about 40 nm (pp)
- the pre-recording is that the wobbling period is 36 T.
- the recording linear density of information is higher than the recording linear density of AD IP information
- the phase change mark is a minimum of 2 T
- the recording linear density of pre-recorded information is It is lower than the recording linear density.
- the phase change mark is not recorded on the track in this PB zone.
- the wobbling waveform is formed in a sine wave shape in the RW zone, but can be recorded in a sine wave shape or a rectangular wave shape in the PB zone.
- the phase change mark can be corrected by recording and reproducing the data with an ECC (error correction code).
- ECC error correction code
- the CNR of the pebble for the AD IP address information is 35 dB when the phase change mark is not recorded when the bandwidth is 30 KHz.
- the address information such signal quality is sufficient by performing interpolation protection based on so-called continuity discrimination, etc., but the prerecorded information recorded in the PB zone has a CNR equivalent to the phase change mark. I want to ensure signal quality of 0 dB or higher. Therefore, Fig. 14B As shown in Fig. 7, the PB zone forms a physically different dub from the group in the RW zone.
- the CNR can be improved by +2 dB.
- the CNR is 43dB.
- the difference between the recording bandwidths of the phase change mark and the record of the prerecorded dead zone is that the record of the record is 18 T (18 T is half of 36 T); d B obtained.
- the CNR as prerecorded information is equivalent to 52.5 dB, and even if the crosstalk from the next track is estimated to be 12 dB, the CNR is equivalent to 50.5 dB. That is, the signal quality is almost the same as that of the phase change mark, and it is sufficiently appropriate to use the coupling signal for recording and reproducing prerecorded information.
- FIG. 15 shows a method of modulating pre-recorded information to form a wobbling loop in the pre-recorded data zone. Modulation uses FM code.
- Fig. 15 (a) shows the data bits
- One bit of data is 2 ch (2 channel clock), and when the bit information is “1”, the frequency of the FM code is 1/2 of the channel clock.
- an FM code may be recorded directly as a rectangular wave, or as a sinusoidal waveform as shown in Fig. 15 (d).
- the FM code and the pebble waveform may be patterns having polarities opposite to those shown in FIGS. 15 (c) and (d), and patterns shown in FIGS. 15 (e) and (f).
- the FM code waveform and the wobble waveform when the data bit stream is “101 1 0 0 10” as shown in Fig. 15 (g)
- the sinusoidal waveform is as shown in Fig. 15 (h) (i).
- FIGS. 15 (e) and (f) when the pattern shown in FIGS. 15 (e) and (f) is used, it becomes as shown in FIGS. 15 (j) and (k).
- Fig. 16 shows the ECC format for main data (user data) for recording and playback with a phase change mark.
- the ECC error correction code
- LDC long distance code
- BIS Biller indicator subcode
- L DC is R S (248, 216, 33) code length 2 48, data 2 16, distance 3 3 R S (reed
- BIS is ECC encoded as shown in FIG. 16 (d) with respect to the data of 720B shown in FIG. 16 (c). That is, R S
- Fig. 18A shows the frame structure of the main data in the RW zone.
- LDC data and BIS constitute a frame structure shown in the figure. That is, data (38 B), BIS (IB), data (38 B), BIS (IB), data (38 B), BIS (IB), data—data (38 B) ) Is arranged to form a structure of 155 B.
- one frame is composed of 15B data of 38B X 4 and 1B of BIS for every 38B.
- the frame sync F S (frame synchronization signal) is arranged at the beginning of one frame 1555B.
- One block has 496 frames.
- the odd-numbered codewords of 1,3,... are located in the odd-numbered frames of 1,3,.
- BIS uses a code that has much better correction capability than the LDC code, and almost all are corrected. That is, a code having a distance of 33 is used for a code length of 62. Therefore, the BIS symbol where the error was detected can be used as follows.
- BIS is decoded first. If two adjacent BISs or frame syncs FS in the frame structure of Fig. 18A have an error, the data 38B sandwiched between the two is regarded as a burst error. An error message is added to each of the 38B. The LDC uses this error pointer to perform pointer erasure correction.
- BIS contains address information and the like. This address is used when there is no address information by the wobbling group in a ROM type disk, etc.
- Fig. 17 shows the ECC format for pre-recorded information.
- the 4 KB of data as pre-recorded information shown in Fig. 17 (a) is ECC encoded as shown in Fig. 17 (b). In other words, for main sector overnight, 4 B EDC (error
- LDC is an RS (reed so 1 omon) code with RS (248, 216, 33), code length 2488, data length 21.6, and distance 33. There are 1 9 code words.
- the BIS is ECC-encoded as shown in FIG. 17 (d) with respect to the 120B data shown in FIG. 17 (c). That is, RS 0
- Fig. 18B shows the frame structure of prerecorded information in the PB zone.
- the LDC data and BIS constitute a frame structure as shown. That is, the frame sync FS (1B), data (10B), BIS (IB), and data (9B) are arranged in one frame to form a 21B structure. It consists of B data and 1 B of BIS inserted.
- the frame sync F S (frame synchronization signal) is arranged at the beginning of one frame.
- One block has 2 4 8 frames.
- BIS uses a code that has much better correction capability than LDC code, and almost all are corrected. For this reason, the BIS symbol where an error is detected can be used as follows.
- BIS When decoding ECC, BIS is decoded first. If two adjacent BISs or frame syncs Fs are in error, the 10B or 9B sandwiched between them is considered to be a burst error. This data 10B or 9B is accompanied by an error. The LDC uses this error pointer to perform pointer correction.
- BIS includes address information and the like.
- pre-recorded information is recorded and recorded by the coupling group. Therefore, there is no address information by the coupling group. Therefore, the address in this BIS is used for access.
- the same code and structure are used as the ECC format for the data and the pre-recorded information by the phase change mark.
- ECC decoding of pre-recorded information can be executed by a circuit system that performs ECC decoding when data is reproduced using phase change marks, and the hardware configuration of a disk drive can be made more efficient. means.
- the recording / reproducing unit of the DVR disk of this example is a link for PLL of one frame before and after the ECC block of 156 symbol x 496 frames shown in Figs. 18A to 18B.
- This is a recording and playback class with a total of 498 frames generated by adding an area.
- This recording and playback cluster is called a RUB (Recording Unit Block).
- one RUB (498 frames) is recorded as three address units (AD IP— 1 and AD IP— 2. It is managed by AD IP-3). That is, one RUB is recorded for these three address units.
- one address unit consists of a total of 83 bits consisting of an 8-bit sync part and a 75-bit data part.
- the cosine signal (C os ( ⁇ t)) is used as the reference carrier signal of the wobble signal to be recorded in the pre-group, and one bit of the wobble signal is used as a reference signal as shown in Fig. 19B. It consists of 56 periods of the carrier signal. Therefore, one cycle of the reference carrier signal (One wobble period) is 69 times the length of one phase change channel.
- 56 periods of the reference carrier signal constituting one bit are referred to as a bit block. 2-3-2.
- Fig. 20 shows the bit configuration of the sync part in the address unit.
- the sync part is a part for identifying the head of the address unit. "I”, sync block "2", sync block "3", sync block "").
- Each sync block consists of two bit blocks, a monotone bit and a sync bit.
- the signal waveform of the monotone bit has a bit synchronization mark BM at the first to third wobble of a 56-bit bit block.
- the 4th to 56th wobble after the mark BM is the monotone wobble (signal waveform of the reference carrier signal (C os ( ⁇ t))).
- the bit synchronization mark BM is a signal waveform generated by performing MSK modulation on modulated data having a predetermined code pattern for identifying the head of a bit block. That is, the bit synchronization mark BM is a signal waveform generated by differentially encoding modulated data having a predetermined code pattern and assigning a frequency in accordance with the code of the differentially encoded data. Note that the minimum code length L of the modulated data is equal to two periods of the pebble period. In this example, one bit
- bit synchronization mark BM is represented by “C os (l. 5 ⁇ t),-C os ( ⁇ t),-C os (1.5 ⁇ t) ".
- the monotone bit generates modulated data (code length of 2 wobble periods) such as “100 000... Can be generated by performing MSK modulation on.
- the bit synchronization mark BM is inserted at the beginning of not only the monotone bit of the sync part but also all the bit blocks described below. Therefore, at the time of recording / reproducing, by synchronizing by detecting and synchronizing the bit synchronization mark BM, it is possible to synchronize the bit blocks in the wobble signal (that is, synchronization of 56 wobble periods). Further, the bit synchronization mark BM is used as a reference for specifying the insertion position in the bit block of various modulation signals described below.
- C The sync bit (syncHit) of the first sync block
- the signal waveform is as shown in Fig. 22A.
- the first to third wobble of the bit block composed of 56 wobble is the bit synchronization mark BM, and the 17th to 19th wobble and 27 to 29
- the 9th wobble is the MSK modulation mark MM, and the remaining wobble waveforms are all monotone wobble.
- the signal waveform of the sync bit (sync "l" bit) of the second sync block is shown in Fig. 23A.
- the 3rd wobble is the bit synchronization mark BM
- the 19th to 21st wobble and the 29th to 31st wobble are the MSK modulation mark MM
- the remaining wobble waveforms are all monotone wobble. Has become.
- the signal waveform of the sync bit (sync "2" bit) of the third sync block is as shown in Fig. 24A.
- Bits 1 to 3 of the 56-bit bit block are bit-synchronous, as shown in Fig. 24A.
- the wobbles and the 31st to 33rd wobbles are MSK modulation marks MM, and the remaining wobbles are all monotone wobbles.
- the signal waveform of the sync bit (sync "3" bit) of the fourth sync block is the bit synchronization mark in the first to third wobble of the 56-bit wobble bit block. It is BM, the 23rd to 25th pebbles and the 33rd to 35th pebbles are the MSK modulation mark MM, and the waveforms of the remaining pebbles are all monotone pebbles.
- the MSK synchronization mark is a signal waveform generated by performing MSK modulation on modulated data having a predetermined code pattern. That is, the MSK synchronization mark is a signal waveform generated by differentially encoding modulated data having a predetermined code pattern and assigning a frequency according to the code of the differentially encoded data. Note that the minimum code length L of the modulated data is two wobble periods. In this example, a signal waveform obtained by performing MSK modulation on the modulated data of 1 bit (2 wobble periods) “1” is recorded as a .MSK synchronization mark.
- this MSK synchronization mark is a signal waveform that is continuous with “C os (1.5 cot), — C os (co t), -C os (1.5 ⁇ t)” in the unit of a pebble period.
- the sync bit (sync “0” bit) of the first sync block generates a data stream (code length of 2 wobble periods) as shown in FIG. Can be generated.
- the sync bit (sync "1" bit) of the second second sync block is a data stream as shown in Fig. 23B
- the sync bit (sync "2" bit) of the third sync block is The data stream as shown in Fig. 24B and the sync bit (sync "3" bit) of the fourth sync block generate a data stream as shown in Fig. 25B, and these are MSK modulated. Can be generated.
- the input pattern of the two MSK modulation marks MM for the bit block is unique to the input pattern of the MSK modulation marks MM of the other bit blocks. Therefore, at the time of recording and reproduction, the MSK demodulation of the sampled signal is performed, the insertion pattern of the MSK modulation mark MM in the bit block is determined, and at least one of the four sync bits is identified.
- the address unit can be synchronized. The demodulation and decoding of the data part described below can be performed. 2-3-3. Data part
- the c data part which indicates the bit configuration of the data part in the data unit, is a part in which the actual data of the address information is stored.
- IP block (ADIP block "to ADIP block” 15 ")
- Each AD IP block consists of one monotone bit and four ADIP bits and power.
- the signal waveform of the monotone bit is the same as that shown in FIG. 21A.
- the ADIP bit represents one bit of the actual data, and the signal waveform changes according to the sign content.
- the first to third samples of the bit block composed of 56 bits become the bit synchronization mark BM as shown in Fig. 27A.
- the 13th to 15th wobble is the MSK modulation mark MM, and the 19th to 55th wobble is the reference carrier signal.
- the AD IP bit whose code content represents “1” is a modulated bit such as “1 0 0 0 00 1 0 0...
- Data (code length is 2 wobble periods) is generated and MSK-modulated, and the amplitude is changed between 19 and 55 wobble of the signal waveform after MSK modulation as shown in Fig. 27C. It can be generated by adding 1 in dB S in (2 ot).
- the first to third bits of the bit block composed of 56 bits are the bit synchronization mark BM.
- the 15th to 17th wobble becomes the MSK modulation mark MM, and the 19th to 55th wobble is the HMW "0 Sin (2 ⁇ t) added to the reference carrier signal (C os (t)).
- the modulation portion of “”, and the waveforms of the remaining wobbles are all monotone wobbles. That is, as shown in FIG. 28B, the AD IP bit representing the code content “0” is the modulated data (code “0 0 0 0 0 0 0 1 0...
- the length is 2 wobble periods), which is subjected to MSK modulation, and as shown in Fig. 28C, the amplitude of the signal waveform is increased to 1 d during the 19th to 55th wobble of the signal waveform after MS ⁇ modulation. It can be generated by adding one S in (2 co t) of B.
- the bit contents of the AD IP bit are distinguished according to the insertion position of the MSK modulation mark MM.
- the bit "1" is indicated, and when the MSK modulation mark MM is inserted at the 15th to 17th wobble, the bit is displayed.
- G represents "0".
- the AD IP bit represents the same bit content as the bit content represented by the insertion position of the MSK modulation mark MM in the HMW modulation. Therefore, this AD IP pit represents the same bit content in two different modulation schemes, so that data decoding can be performed reliably.
- Figure 29 shows the format of the address unit, which is a combination of the above-mentioned sink part and data part.
- the address format of the optical disc 1 of this example is such that the bit synchronization mark BM, the MSK modulation mark MM, and the HMW modulation section are discretely arranged in one address unit. Are located. Then, between each modulation signal portion, a monotonous wobble having a period of at least one wobble is arranged. Therefore, there is no interference between the modulated signals, and each signal can be demodulated reliably. 2-3-4. Contents of address information
- the address format as ADIP information recorded as described above is as shown in FIG.
- the AD IP address information has 36 bits, to which 24 bits of parity are added.
- the 36-bit AD IP address information consists of 3 bits (layer no.bit 0 to layer no.bi 12) for multilayer recording and 19 bits (RUB no.bit 0) for RUB ( ⁇ recording unit block). ⁇ Layer no. Bit 18), 2 bits (address no. Bit 0, address no. Bi 11) for three address blocks for one RUB.
- 12 bits are prepared as AUX data such as a disc ID in which recording conditions such as recording / reproduction laser power are recorded.
- This AUX data is used for data recording as disc information described later.
- the error correction method is a nibble-based Reed-Solomon code RS (15, 9, 7) with 4 bits as one symbol. In other words, the code length is 15 2 bulls, the data is 9 bulls, and the parity is 6 bulls. 2— 4.
- FIG. 31 shows a block diagram of the address demodulation circuit.
- the address demodulation circuit 30 includes a PLL circuit 31, a timing generator 32 for MSK, a multiplier 33 for 1 ⁇ 31 ⁇ , an integrator 3 4 for MSK, MSK sample Z hold circuit 35, MSK slice circuit 36, Sync decoder 37, MSK address decoder 38, HMW timing generator 42, HMW multiplier 4 3, an integrator 44 for [?, A sample Z-hold circuit 45 for HMW, a slice circuit 46 for HMW, and an HMW address decoder 47.
- the PLL signal 31 receives a sample signal reproduced from a DVR disc.
- the PLL circuit 31 detects an edge component from the input wobble signal and generates a wobble clock synchronized with the reference carrier signal (Cos ( ⁇ t)).
- the generated wobbled clock is supplied to the MSK timing generator 32 and the HMW timing generator 42.
- the MSK timing generator 32 generates a reference carrier signal (C os ( ⁇ t)) synchronized with the input wobble signal.
- the MSK timing generator 32 generates a clear signal (CLR) and a hold signal (HOLD) from the pebble clock.
- Clear signal (CLR) Is a signal generated at a timing delayed by 12 pobble periods from the start edge of the data clip of the modulated data in which two of the pebble periods have the minimum code length.
- the hold signal (HOLD) is a signal generated at a timing delayed by 1 Z 2 wobble periods from the end edge of the data clock of the modulated data.
- the reference carrier signal (C os ( ⁇ t)) generated by the MSK timing generator 32 is supplied to the MSK multiplier 33.
- the generated clear signal (CLR) is supplied to the MSK multiplier 34.
- the generated hold signal (HOLD) is supplied to the sample and hold circuit 35 for MSK.
- the MSK multiplier 33 multiplies the input wobble signal by the reference carrier signal (Cos (ct)) to perform synchronous detection processing.
- the synchronously detected output signal is supplied to the MSK integrator 34.
- the MSK integrator 34 performs an integrating process on the signal synchronously detected by the MSK multiplier 33.
- the MSK integrator 34 clears the integrated value to 0 at the generation timing of the clear signal (CLR) generated by the MSK timing generator 32.
- the MSK sample / hold circuit 35 samples the integrated output value of the MSK integrator 34 at the generation timing of the hold signal (HOLD) generated by the MSK timing generator 32. The sampled value is held until the next hold signal (HOLD) occurs.
- the MSK slice circuit 36 binarizes the value held by the MSK sample Z hold circuit 35 using the origin (0) as a threshold, inverts the sign of the value, and outputs the inverted value.
- the Sync decoder 37 detects a sync bit in the sync part from the bit pattern of the demodulated data output from the MSK slice circuit 36.
- the Sync decoder 37 synchronizes the address unit from the detected sync bit. Based on the synchronization timing of the address unit, the Sync decoder 37 detects the MSK detection window indicating the position of the MSK-modulated data in the ADIP bit of the data part and the HMW in the ADIP bit of the data part.
- An HMW detection window indicating the position of the modulated data is generated.
- Figure 32A shows the synchronization timing of the address unit detected from the sync bit
- Figure 32B shows the timing of the MSK detection window
- Figure 32C shows the timing of the HMW detection window. Shows timing.
- the Sync decoder 37 supplies the MSK detection window to the MSK address decoder 38, and supplies the HMW detection window to the HMW evening generator 42.
- the MSK address decoder 38 receives the demodulated stream output from the MSK slice circuit 36, and inserts the MSK modulation mark MM in the AD IP bits of the data stream demodulated based on the MSK detection window. The position is detected, and the code content represented by the AD IP bit is determined. That is, when the input pattern of the MSK modulation mark of the AD IP bit is a pattern as shown in FIGS. 27A to 27C, the code content is determined to be “1”, and the AD content is determined. If the insertion pattern of the MSK modulation mark of the IP bit is a pattern as shown in FIGS. 28A to 28C, the code content is determined to be “0”. Then, a bit string obtained from the determination result is output as MSK address information.
- the HMW timing generator 42 generates a second harmonic signal (S in (2 ⁇ t)) synchronized with the input wobble signal from the wobble clock. Generate also, the HMW timing generator 42 generates a clear signal (CLR) and a hold signal (HOLD) from the HMW detection window.
- the clear signal (CLR) is a signal generated at the timing of the start edge of the HMW detection window.
- the hold signal (HOLD) is a signal generated at the end of the HMW detection window.
- the second harmonic signal (S in (2 ⁇ t)) generated by the HMW timing generator 42 is supplied to the HMW multiplier 43.
- the generated clear signal (CLR) is supplied to the HMW integrator 44.
- the generated hold signal (HOLD) is supplied to the sample and hold circuit 45 for HMW.
- the multiplier for 111 ⁇ ⁇ multiplies the input wobble signal by the second harmonic signal (S in (2 ⁇ t)) to perform synchronous detection processing.
- the output signal after the synchronous detection is supplied to the HMW integrator 44.
- the HMW integrator 44 performs an integration process on the signal synchronously detected by the HMW multiplier 43.
- the HMW integrator 44 clears the integrated value to 0 at the generation timing of the clear signal (CLR) generated by the HMW timing generator 42.
- CLR clear signal
- the HMW slice circuit 46 binarizes the value held by the HMW sample / hold circuit 45 using the origin (0) as a threshold and outputs the sign of the value.
- the output signal from the HMW slice circuit 46 becomes a demodulated data stream.
- FIGS. 33A to 33C show signal waveforms when the ADIP bit with the code content “1” is HMW-demodulated by the address demodulation circuit 30.
- the horizontal axis (n) in FIG. 33A to FIG. 33C indicates the period number of the pebble period.
- FIG. 33A shows the reference carrier signal (C os (co t)), the modulated data whose code content is “1”, and the second harmonic signal waveform ( S in (2 co t),-1 2 dB).
- FIG. 33B shows the generated wobble signal.
- Fig. 33C shows the synchronous detection output signal (HMWX Sin (2 cot)) of this cobble signal, the integrated output value of the synchronous detection output signal, the hold value of this integrated output value, and the slice circuit. The figure shows the demodulated data output from.
- FIGS. 34A to 34C show signal waveforms when the address demodulation circuit 30 performs HMW demodulation on the AD IP bit having the code content of “0”.
- the horizontal axis (n) in FIGS. 34A to 34C indicates the period number of the pebble period.
- FIG. 34A shows a reference carrier signal (C os ( ⁇ t)), modulated data having a code content of “1”, and a second-harmonic signal waveform generated according to the modulated data ( ⁇ S in (2 co t), — 1 2 d B).
- FIG. 34B shows the generated pebble signal.
- number 3 Fig. 4C shows the synchronous detection output signal (HMWX Sin (2 cot)) of this cobble signal, the integrated output value of the synchronous detection output signal, the hold value of this integrated output value, and the slice circuit.
- the figure shows the demodulated data output from 6.
- the address demodulation circuit 30 detects the synchronization information of the address unit recorded by the MSK modulation, and can perform the MSK demodulation and the HMW demodulation based on the detection timing.
- data as disc information is recorded in advance as coupling information along with absolute address information as an ADIP address by a coupling dub.
- the address format in ECC units as ADIP information described in FIG. 30 includes 12 bits of AUX data (reserve bits 0 to reserve biil2), but these 12 bits are used for disc information. Used as
- the disc information is composed of, for example, 112 bytes obtained by collecting 12 bits of an ECC block of ADIP information, and includes disc attributes and control information as described below.
- Fig. 35 shows the contents of the disc information consisting of 112 bytes, and the contents are shown for each byte position (byte number) of the 112 bytes. It also shows the number of bytes of each content. Two bytes, byte number 0 and 1, record the code “DI” as the disc information identifier.
- One byte of byte number 2 indicates a purge file in the format of disc information.
- One byte of byte number 4 indicates the number of frames in the disc information block.
- One byte of byte number 5 indicates a frame number in the disc information block.
- One byte of byte number 6 indicates the number of bytes used in the corresponding frame of the disk information block.
- Codes indicating the disc type such as rewritable / ROM type, are recorded in the three bytes of byte pickers 8 to 10.
- One byte of the byte number 11 indicates a disk diameter such as, for example, 120 mm as a disk size, and a format version.
- One byte of the byte number 12 indicates the number of layers of the multilayer disc as a disc structure.
- One byte of the byte number 13 indicates the channel density, that is, the capacity.
- One byte of the byte number 16 indicates presence or absence of BCA.
- One byte of byte number 17 indicates the maximum transfer rate of the application.
- the last address of the user data area is indicated in the eight bytes of the byte picker 24-31.
- the recording speed is indicated in the 4 bytes of byte numbers 32 to 35.
- the maximum DC reproduction power is shown in the four bytes of the byte numbers 36 to 39.
- the four bytes of byte numbering 40 to 43 indicate the maximum reproduction power of the high-frequency modulated data.
- the eight bytes of byte pickers 48 to 55 indicate the recording power at the nominal recording speed.
- Eight bytes of byte numbers 56 to 63 indicate the recording power at the maximum recording speed.
- Eight bytes of byte numbering 64 to 71 indicate the recording power at the minimum recording speed.
- One byte of the byte number 72 indicates the recording multi-pulse width.
- the three bytes of byte numbers 73 to 75 indicate the initial recording pulse width.
- the three bytes of byte numbers 76 to 78 indicate the first recording pulse position at the nominal recording speed.
- the three bytes of byte numbering 79 to 81 indicate the first recording pulse position at the maximum recording speed.
- the three bytes of byte numbers 82 to 84 indicate the position of the first recording pulse at the minimum recording speed.
- One byte of the byte number 8 indicates an erase multi-pulse width.
- the three bytes of byte pickers 89 to 91 indicate the position of the first erase pulse at the nominal recording speed.
- the three bytes of byte numbers 92 to 94 indicate the position of the first erase pulse at the maximum recording speed.
- the three bytes, byte number 95 to 97, indicate the first pulse position at the minimum recording speed.
- a flag bit indicating the polarity of the erase pulse is recorded.
- Such disc information is recorded at least in the RW zone in the lead-in zone described in FIG.
- the pre-recorded data is recorded as the PB zone on the inner circumference side, but after the PB zone, the RW zone that can perform overnight recording and reproduction by the phase change recording method
- the recording of absolute addresses as AD IP information is started from the beginning of the RW zone.
- the disc information is recorded using AUX data (reserve bitO to reserve bitl2) in the ADIP information together with the ADIP address.
- the lead-in zone is the area that the disk drive unit first accesses when loading a disk
- the disk information is recorded in at least the lead-in zone, and the disk drive unit can use the information shown in Fig. 35 above. It is suitable for reading.
- AD IP information is also recorded in the data zone
- disc information can also be recorded using bits as AUX data in the data zone. That is, the disc information having the above configuration may be repeatedly recorded over the entire area of the RW zone.
- AD IP information uses nibble-based Reed-Solomon code RS (15, 9, 7) with 4-bit as 1 symbol as error correction method, as described in ECC block format in Fig. 30. The address information is recorded continuously on the disc.
- This error correction coding is based on the theory that even if an error occurs to a certain extent, it does not cause much problem. The scheme alone is sufficient.
- disc information is required to have a higher error correction method than address information because disc information contains information that is used as a reference when recording and reproducing data on disc 1.
- the disc information is subjected to advanced error correction encoding (encoding using the first error correction method), and then AUX data (reserve MtO to reserve bitl2) is used as the AD IP format.
- AUX data reserve MtO to reserve bitl2
- the disc information recorded as AD IP data is coded according to the first error correction method, and is further nibble-based so that it is used as an ECC block of 60-bit AD IP information.
- Encoding is performed by the second error correction method (15, 9, 7), and double error correction encoding is performed.
- the error correction encoding for the disc information is performed in the same manner as the error correction encoding of the user data recorded / reproduced by the phase change recording method, so that a more advanced error correction encoding is performed. Error correction capability is obtained.
- FIG. 16 shows this as 248 bytes of 1 ECC code code data of 21 bytes and parity of 32 bytes.
- the LDC uses an R S (reed soo omon) code of R S (248, 216, 33), code length 2488, data 2 16, and distance 33.
- Fig. 37 shows the ECC format of the disc information.
- the AUX data consists of 12 bits, or 1.5 bytes, in one ADIP header (format shown in Fig. 30).
- the disc information frame (DI frame) is composed of 96 ADIP, that is, 144 bytes.
- the information amount of the disc information of one DI frame is 112 bytes.
- Fig. 37 shows an ECC format with a parity of 32 bytes added to the data of 2 16 bytes.
- the RS code has a code length of 2488, data of 21.6, distance of 33, and parity of 32.
- the disk information becomes a data having a high error correction capability like the user data, and the reliability is improved.
- the number of symbols recorded on the disk 1 can be reduced, the recording line density can be increased, the reliability can be improved, or the capacity can be recorded more.
- FIG. 38 shows the configuration of the disk drive device.
- the disc 1 is mounted on a turntable (not shown), and is rotated at a constant linear velocity (CLV) by a spindle motor 52 during a recording Z reproduction operation.
- CLV constant linear velocity
- the ADIP information (address and disc information) embedded as the wobbling of the groove track in the RW zone on the disc 1 is read by the optical pickup (optical head) 51. Also, the pre-recorded information embedded as the wobbling of the groove track in the PB zone is read.
- user data is recorded as a phase change mark on the track in the RW zone by the optical pickup, and at the time of reproduction, the phase change mark recorded by the optical pickup is read.
- a laser diode serving as a laser light source, a photodetector for detecting reflected light, an objective lens serving as an output end of the laser light, and a laser beam are applied to the disk recording surface via the objective lens.
- the laser diode which forms an optical system (not shown) for guiding the reflected light to the photodetector, outputs a so-called blue laser having a wavelength of 405 nm. N A by the optical system is 0.85.
- the objective lens is held movably in the tracking direction and the focus direction by a two-axis mechanism.
- the entire pickup 51 can be moved in the radial direction of the disc by a thread mechanism 53.
- the laser diode in the pickup 51 is driven to emit laser light by a drive signal (drive current) from the laser driver 63.
- the reflected light information from the disk 1 is detected by a photodetector, and an electric signal corresponding to the amount of received light is output. Then, it is supplied to the matrix circuit 54.
- the matrix circuit 54 includes a current-voltage conversion circuit, a matrix operation Z amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as a photodetector, and generates a necessary signal by matrix operation processing.
- the processor For example, it generates a high-frequency signal (reproduced data signal) corresponding to reproduced data, a focus error signal for support control, and a tracking error signal.
- a push-pull signal is generated as a signal related to group wobbling, that is, a signal for detecting wobbling.
- the reproduced data signal output from the matrix circuit 54 is supplied to the reader / writer circuit 55, the focus error signal and the tracking error signal are supplied to the support circuit 61, and the push-pull signal is supplied to the coupon circuit 58.
- the reader Z writer circuit 55 performs a binarization process, a reproduction clock generation process by a PLL, etc. on the reproduced data signal, reproduces the data read as the phase change mark, and modulates the data. Supply to 6.
- the modulation / demodulation circuit 56 has a functional part as a decoder at the time of reproduction and a functional part as an encoder at the time of recording.
- demodulation processing of run-length limited code is performed based on the reproduction clock.
- the ECC encoder / decoder 57 performs ECC encoding processing for adding an error correction code during recording and ECC decoding processing for performing error correction during reproduction.
- the data demodulated by the modulation / demodulation circuit 56 is fetched into the internal memory and subjected to processing such as error detection and correction and dive-leaving to obtain reproduced data.
- the ECC encoding process and the ECC decoding process in the ECC encoder / decoder 57 are performed by the RS (248, 216, 33), the code length 2 48 data 2 16 and the distance 3 3 RS (reed This is a process corresponding to the ECC format using the solomon) code.
- the data decoded by the ECC encoder Z decoder 57 until the playback is completed is read out and transferred to the AV (Audio-Visual) system 120 based on the instruction of the system controller 60.
- the push-pull signal output from the matrix circuit 54 as a signal related to the coupling of the group is processed in the movable circuit 58.
- the push-pull signal as ADIP information is subjected to MSK demodulation and HMW demodulation in the wobbled circuit 58, demodulated into a data stream forming an ADIP address, and supplied to the address decoder 59.
- the address decoder 59 decodes the supplied data, obtains an address value, and supplies it to the system controller 60.
- the address decoder 59 generates a clock by PLL processing using the enable signal supplied from the enable circuit 58, and supplies the generated clock to each section as, for example, an encoding clock at the time of recording.
- the pair circuit 58 and the address decoder 59 have, for example, the configuration shown in FIG.
- the address decoder 59 performs an error correction process using a nibble-based Reed-Solomon code R S (15, 9, 7) corresponding to the ECC format shown in FIG.
- the address value supplied to the system controller 60 has been subjected to this error correction processing.
- disc information recorded using AUX data is extracted by the address decoder 59 in units of 12 bits from one ECC block (AD IP code) and supplied to the ECC encoder / decoder 57. .
- the ECC encoder / decoder 57 adds 104 bytes of dummy data to 144 B by the 96 AD IP code shown in FIGS. 27A to 27C. Generate a single word, RS
- the disk information can be obtained and supplied to the system controller 60.
- the system controller 60 can perform various setting processing ⁇ copy protection processing based on the read pre-recorded information ( recording data is transferred from the AV system 120 at the time of recording.
- the recording data is sent to a memory in the ECC encoder / decoder 57 and is buffered.
- the ECC encoder Z decoder 57 adds an error correction code addition pin and a subcode as encoding processing of the buffered recording data.
- the ECC encoded data is subjected to RLL (1-7) PP modulation in a modulation / demodulation circuit 56 and supplied to a reader / writer circuit 55.
- a clock generated from a wobble signal is used as an encode clock serving as a reference clock for these encoding processes during recording.
- the recording data generated by the encoding process is subjected to a recording / compensation process in a reader / writer circuit 55 to fine-tune the optimum recording power for the characteristics of the recording layer, laser beam spot shape, recording linear velocity, etc. pulse After adjustment of the waveform is performed, the laser drive pulse is sent to the laser driver 63.
- the laser driver 63 supplies the supplied laser drive pulse to the laser diode in the pickup 51 to perform laser emission driving. As a result, pits (phase change marks) corresponding to the recorded data are formed on the disc 1.
- the laser driver 63 has a so-called APC circuit (Auto Power Control), and monitors the laser output power by the output of a laser power monitor provided in the pickup 51.
- the laser output is controlled so as to be constant regardless of the temperature.
- the target value of the laser output at the time of recording and at the time of reproduction is given from the system controller 60, and at the time of recording and at the time of reproduction, the laser output level is controlled so as to become the target value.
- the servo circuit 61 generates various focus, tracking, and sled support drive signals from the focus error signal and the tracking error signal from the matrix circuit 54, and executes the servo operation.
- a focus drive signal and a tracking drive signal are generated according to the focus error signal and the tracking error signal, and the focus coil and the tracking coil of the two-axis mechanism in the pickup 51 are driven.
- a pickup 51, a matrix circuit 54, a servo circuit 61, a tracking servo loop and a force servo loop formed by a two-axis mechanism are formed.
- the support circuit 61 turns off the tracking support in response to a track jump command from the system controller 60 and outputs a jump drive signal to execute a track jump operation. .
- the support circuit 61 generates a thread drive signal based on a thread error signal obtained as a low-frequency component of the tracking error signal, an access execution control from the system controller 60, and the like.
- Structure 53 is driven.
- the thread mechanism 53 has a mechanism including a main shaft for holding the pick-up 51, a threaded motor, a transmission gear, and the like. By driving the threaded motor in accordance with a thread drive signal, the pick-up 5 The required slide movement of 1 is performed.
- the spindle servo circuit 62 controls the spindle motor 52 to rotate CLV.
- the spindle support circuit 62 obtains the clock generated by the PLL process for the wobble signal as the current rotational speed information of the spindle motor 52, and compares this with predetermined CLV reference speed information. Generate spindle error signal.
- the reproduction clock (clock used as a reference for decoding) generated by the PL in the reader Z writer circuit 55 becomes the current rotation speed information of the spindle motor 52.
- the spindle error signal can also be generated by comparing with the predetermined CLV reference speed information.
- the spindle servo circuit 62 outputs the spindle drive signal generated in accordance with the spindle error signal, and causes the spindle motor 62 to execute the CLV rotation.
- the spindle servo circuit 62 generates a spindle drive signal in accordance with the spindle kick Z brake control signal from the system controller 60, and also executes operations such as start, stop, acceleration, and deceleration of the spindle motor 52. . JP03 / 07410
- system controller 60 formed by a microcomputer.
- the system controller 60 executes various processes in response to a command from the AV system 120.
- the system controller 60 when a write command (write command) is issued from the AV system 120, the system controller 60 first moves the pickup 51 to the address to be written.
- the ECC encoder / decoder 57 and the modulation / demodulation circuit 56 perform end processing on the data transferred from the AV system 120 (for example, video data of various formats such as MPEG 2 and audio data) as described above. Let it run. Then, as described above, the laser drive pulse from the reader / writer circuit 55 is supplied to the laser driver 63 to execute the recording.
- the seek operation control is first performed for the designated address. I do. That is, a command is issued to the support circuit 61, and the access operation of the pickup 51 with the address specified by the seek command as an overnight get is executed.
- the operation control required to transfer the data in the specified data section to the AV system 120 is performed. That is, data is read from the disk 1 and decoding / buffering in the reader / writer circuit 55, the modulation / demodulation circuit 56, the ECC encoder / decoder 57 and the like are executed, and the requested data is transferred.
- the system controller 60 When data is recorded and reproduced using these phase change marks, the system controller 60 operates the wobbled circuit 58 and the address deco It controls access and recording / reproducing operations using the ADIP address detected by the decoder 59.
- the system controller 60 is recorded as a unique ID recorded in the BCA of the disc 1 or as an coupling group in the pre-recorded data zone PR.
- the pre-recorded information is read out.
- seek operation control is performed for the purpose of BCA and the pre-recorded dead data zone PR. That is, a command is issued to the servo circuit 61 to make the pickup 51 access the innermost peripheral side of the disk.
- the reproduction trace is executed by the pickup 51, the push-pull signal as the reflected light information is obtained, and the decoding process is executed by the cobble circuit 58, the reader / writer circuit 55, and the ECC encoder decoder 57, and Get playback information as information and pre-recorded dead information.
- the system controller 60 performs the setting of a laser beam, a copy protection process, and the like based on the BCA information and the pre-recorded information thus read.
- the system controller 60 controls the access and the reproduction operation by using the address information included in the read BIS class as the pre-recorded information.
- the disk drive is connected to the AV system 120, but the disk drive of the present invention may be connected to, for example, a personal computer.
- an operation unit and a display unit are provided, and the configuration of the interface for input / output of data is different from that shown in FIG. That is, it is only necessary that recording and reproduction be performed in accordance with the operation of the user, and that terminals for input and output of various data be formed.
- the disc manufacturing process can be broadly divided into the so-called mastering process (mastering process) and the disc making process (replication process).
- mastering process is a process up to the completion of a metal master (a stamper) used in the disc making process
- the disc making process is a process for mass-producing optical discs that are duplicates of the master using a stamper.
- a so-called masking is performed, in which a photoresist is applied to a polished glass substrate, and a pit group is formed on the photosensitive film by exposure to a laser beam.
- grouping is performed by wobbling based on pre-recorded information in the part corresponding to the PB zone on the innermost side of the disk, and the ADIP address is used in the part corresponding to the RW zone.
- mastering of groups by coupling based on disc formation.
- Prerecorded information and disc information to be recorded are prepared in a preparation process called premastering. Then, when the mastering is completed, a predetermined process such as development is performed. For example, information is transferred onto a metal surface by an electrode to create a stamper necessary for duplicating a disc.
- the mastering device includes a prerecorded information generating section 71, a prerecorded ECC encoding section 72, a switching section 73, a master ring section 74, and a disc information generating section. 7 5. It has an address generator 76, an ECC encoder for disk information 77, a synthesizer 78, an ECC encoder for address 79, and a controller 70.
- the pre-recorded information generator 71 outputs pre-recorded information prepared in the pre-mastering step.
- the outputted pre-recorded information is subjected to error correction encoding processing in a pre-recorded ECC encoder 72.
- ECC encoder 72 For example, R S
- the disc information generating unit 75 generates 112 bytes of information described in FIG.
- the generated disk information of 112 bits is added to the disk information ECC encoder unit # 7 by adding 104 bytes of dummy data as described in Fig. 37.
- the address generator 76 sequentially outputs values as absolute addresses.
- the synthesizing unit 78 synthesizes the address value output from the address generating unit 76 with the disc information ECC-encoded by the disc information ECC encoding unit 77. In other words, data of 9 doubles (36 bits) of the AD IP word in the format of FIG. In other words, the disc information that has been ECC encoded is incorporated as an auxiliary data in the AD IP word. Note that the dummy data portion shown in FIG.
- the address ECC encoder 79 performs error correction encoding using the nibble-based Reed-Solomon code RS (15, 9, 7) to form an ECC block in the format shown in FIG. Is done.
- the masking ring section 74 includes an optical section (82, 83, 84) for irradiating the photoresist glass substrate 101 with a laser beam to perform mastering, and a glass substrate 101.
- the mastering position It From the position of the substrate rotation / transfer unit 85 for rotating drive and slide transfer, the signal processing unit 81 that converts input data into recording data and supplying it to the optical unit, and the substrate rotation Z transfer unit 85, the mastering position It has a sensor 86 so that it can be distinguished whether it is a PB zone or an RW zone.
- the optical unit includes, for example, a laser light source 82 composed of a He—Cd laser, a modulation unit 83 that modulates light emitted from the laser light source 82 based on recording data, and a modulation unit 83.
- a mastering head section 84 for condensing the modulated beam and irradiating the photoresist surface of the glass substrate 101 with the modulated beam is provided.
- the modulation section 83 includes an acoustic optics type optical modulator (AOM) for turning on / off the light emitted from the laser light source 82, and the light emitted from the laser light source 82.
- AOM acoustic optics type optical modulator
- AOD acousto-optic type optical deflector
- the substrate rotating / transporting unit 85 includes a rotating motor for rotating the glass substrate 101, a detecting unit (FG) for detecting the rotating speed of the rotating motor, and a glass substrate 101 in the radial direction.
- the signal processor 81 includes a slide motor for sliding, a rotation motor, a rotation speed of the slide motor, a controller for controlling the tracking of the mastering head 84, and the like. For example, a pre-recorded information supplied via the switching unit 73 or ADIP information including disc information and address information is subjected to predetermined arithmetic processing to perform a modulated signal generation process of forming a modulated signal.
- a driving process for driving the optical modulator and the optical deflector of the modulator 83 based on the modulation signal is also performed.
- the substrate rotating / transporting unit 85 drives the glass substrate 101 to rotate at a constant linear speed and spirals at a predetermined track pitch while rotating the glass substrate 101. Slide so that the shape of the track is formed.
- the emitted light from the laser light source 82 is passed through the modulator 83 to be a modulated beam based on the modulated signal from the signal processor 81, and from the mastering head 84 to the glass substrate 10
- the first photoresist surface is irradiated, and as a result, the photoresist is exposed based on data and groups.
- the controller 70 controls the execution of such mastering operation of the mastering section 74, and monitors the signal from the sensor 86 while prerecorded information generation section 71 and disk information.
- the generator 75, the address generator 76, and the switch 73 are controlled.
- the controller 70 initializes the slide position of the substrate rotation Z transfer section 85 so that the master ring section 84 starts laser irradiation from the innermost side to the mastering section 74. Position. Then, CLV rotation driving of the glass substrate 101 and slide transfer for forming a group having a track pitch of 0.35 m are started.
- the pre-recorded information is output from the pre-recorded information generating section 71 and supplied to the signal processing section 81 via the switching section 73.
- the laser output from the laser light source 82 is started, and the modulation section 83 receives the laser light based on the modulation signal from the signal processing section 81, that is, the FM code modulation signal of the pre-recorded information. Is modulated, and the group mass ring to the glass substrate 101 is executed. ,
- the controller 70 switches the switching unit 73 to the address ECC encoding unit 79 and The address generation unit 76 instructs to sequentially generate address values, and the disk information generation unit 75 instructs to generate disk information.
- the slide transfer speed is reduced so as to form a dub with a track pitch of 0.32 m.
- the address information and the ADIP information including the discrimination information are supplied from the address ECC encoding section 79 to the signal processing section 81 via the switching section 73.
- the laser light from the laser light source 82 is modulated by the modulation section 83 from the signal processing section 81, that is, MSK modulation. And HMW modulation, and the modulated laser light performs group mastering on the glass substrate 101.
- group mastering as shown in FIG. 14A described above is performed in the area corresponding to the RW zone.
- the controller 70 When the controller 70 detects from the signal of the sensor 86 that the mastering operation has reached the end of the lead-out zone, the controller 70 ends the mastering operation.
- an exposure portion corresponding to a coupling plate as a PB zone and a RW zone is formed on the glass substrate 101. After that, development, electric power, etc. are performed to produce a stamper, and the above-described disc 1 is produced using the stamper.
- the generated disc 1 is a disc in which ADIP information including disc information is recorded by the wobbling group in the RW zone.
- the disk according to the embodiment, the disk drive device corresponding to the disk, and the disk manufacturing method have been described above.
- the present invention is not limited to these examples, and various modifications can be considered within the scope of the gist. Things.
- the user data is recorded as a phase change mark.
- the recording method of the user data may be a rewritable or additionally rewritable method.
- the present invention can be applied to a disk or a disk drive device compatible with recording systems such as a magneto-optical recording system and a dye change system.
- the disk recording medium of the present invention or the disk recording medium manufactured by the disk manufacturing method of the present invention can record and reproduce the first data by a rewritable or write-once recording method.
- Group ⁇ A recording / reproducing area that enables reproduction of the second data recorded by wobbling.
- the second data includes address information and additional information, and the additional information includes the first information.
- the additional information encoded by the second error correction method and the address information are recorded in a state encoded by the second error correction method.
- additional information such as disc attributes is recorded together with address information by a coupling group, and recording of suitable additional information can be performed by a high-density disc because recording by emboss pits is not used. Since the error correction coding is performed twice in the second error correction method, very reliable information can be obtained.
- the first error correction method used for additional information is encoded and recorded using the same error correction method as the first data, which is the main data.
- the error correction code can be used, and the reliability of the additional information can be improved.
- the error correction encoding Z decoding unit corresponding to the first error correction method functions as an additional information error correction decoding unit (additional information decoding means) and records. No. to be played
- the additional information recorded on the disc recording medium is the first data.
- the present invention is suitable as a large-capacity disk recording medium, and has a great effect of improving the recording / reproducing operation performance of the disk drive device.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Optical Recording Or Reproduction (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK03733362.2T DK1515332T3 (da) | 2002-06-11 | 2003-06-11 | Diskindspilningsmedium, diskfremstillingsfremgangsmåde og diskdrevanordning |
KR1020047002046A KR100968994B1 (ko) | 2002-06-11 | 2003-06-11 | 디스크 기록 매체, 디스크 제조 방법, 디스크 드라이브 장치 |
EP03733362.2A EP1515332B1 (en) | 2002-06-11 | 2003-06-11 | Disk recording medium, disk production method, and disk drive apparatus |
AU2003242280A AU2003242280B2 (en) | 2002-06-11 | 2003-06-11 | Disk recording medium, disk manufacturing method, and disk drive apparatus |
US10/486,283 US7190655B2 (en) | 2002-06-11 | 2003-06-11 | Disk recording medium, disk manufacturing method, and disk drive apparatus |
MXPA04000405A MXPA04000405A (es) | 2002-06-11 | 2003-06-11 | Medio de grabacion de disco, metodo de produccion de disco, aparato de unidad de disco. |
US11/627,184 US7668062B2 (en) | 2002-06-11 | 2007-01-25 | Disk recording medium, disk production method, disk drive apparatus |
US12/652,525 US8553511B2 (en) | 2002-06-11 | 2010-01-05 | Disk recording medium, disk production method, disk drive apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-170265 | 2002-06-11 | ||
JP2002170265A JP4115173B2 (ja) | 2002-06-11 | 2002-06-11 | ディスク記録媒体、ディスク製造方法、ディスクドライブ装置 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10486283 A-371-Of-International | 2003-06-11 | ||
US11/627,184 Continuation US7668062B2 (en) | 2002-06-11 | 2007-01-25 | Disk recording medium, disk production method, disk drive apparatus |
Publications (1)
Publication Number | Publication Date |
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WO2003105151A1 true WO2003105151A1 (ja) | 2003-12-18 |
Family
ID=29727759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/007410 WO2003105151A1 (ja) | 2002-06-11 | 2003-06-11 | ディスク記録媒体、ディスク製造方法、ディスクドライブ装置 |
Country Status (11)
Country | Link |
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US (3) | US7190655B2 (ja) |
EP (1) | EP1515332B1 (ja) |
JP (1) | JP4115173B2 (ja) |
KR (1) | KR100968994B1 (ja) |
CN (1) | CN100541637C (ja) |
AU (1) | AU2003242280B2 (ja) |
DK (1) | DK1515332T3 (ja) |
MX (1) | MXPA04000405A (ja) |
RU (1) | RU2316832C2 (ja) |
TW (1) | TWI233609B (ja) |
WO (1) | WO2003105151A1 (ja) |
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- 2003-06-11 MX MXPA04000405A patent/MXPA04000405A/es active IP Right Grant
- 2003-06-11 WO PCT/JP2003/007410 patent/WO2003105151A1/ja active Application Filing
- 2003-06-11 US US10/486,283 patent/US7190655B2/en not_active Expired - Fee Related
- 2003-06-11 EP EP03733362.2A patent/EP1515332B1/en not_active Expired - Lifetime
- 2003-06-11 CN CNB038010186A patent/CN100541637C/zh not_active Expired - Lifetime
- 2003-06-11 AU AU2003242280A patent/AU2003242280B2/en not_active Ceased
- 2003-06-11 DK DK03733362.2T patent/DK1515332T3/da active
- 2003-06-11 KR KR1020047002046A patent/KR100968994B1/ko not_active IP Right Cessation
- 2003-06-11 RU RU2004103973/28A patent/RU2316832C2/ru not_active IP Right Cessation
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2007
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Also Published As
Publication number | Publication date |
---|---|
TW200403643A (en) | 2004-03-01 |
EP1515332A4 (en) | 2010-03-03 |
US8553511B2 (en) | 2013-10-08 |
RU2316832C2 (ru) | 2008-02-10 |
EP1515332A1 (en) | 2005-03-16 |
TWI233609B (en) | 2005-06-01 |
US7668062B2 (en) | 2010-02-23 |
KR20050004766A (ko) | 2005-01-12 |
EP1515332B1 (en) | 2013-05-22 |
JP4115173B2 (ja) | 2008-07-09 |
US20050088885A1 (en) | 2005-04-28 |
KR100968994B1 (ko) | 2010-07-09 |
US20070115765A1 (en) | 2007-05-24 |
US20100103790A1 (en) | 2010-04-29 |
US7190655B2 (en) | 2007-03-13 |
RU2004103973A (ru) | 2005-03-10 |
AU2003242280A1 (en) | 2003-12-22 |
JP2004014087A (ja) | 2004-01-15 |
CN100541637C (zh) | 2009-09-16 |
CN1554093A (zh) | 2004-12-08 |
DK1515332T3 (da) | 2013-07-01 |
MXPA04000405A (es) | 2004-03-18 |
AU2003242280B2 (en) | 2009-10-29 |
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