WO2009122566A1 - Appareil et procédé de reproduction et programme d'ordinateur - Google Patents

Appareil et procédé de reproduction et programme d'ordinateur Download PDF

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Publication number
WO2009122566A1
WO2009122566A1 PCT/JP2008/056485 JP2008056485W WO2009122566A1 WO 2009122566 A1 WO2009122566 A1 WO 2009122566A1 JP 2008056485 W JP2008056485 W JP 2008056485W WO 2009122566 A1 WO2009122566 A1 WO 2009122566A1
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WIPO (PCT)
Prior art keywords
signal
read
mark
space
run length
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Application number
PCT/JP2008/056485
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English (en)
Japanese (ja)
Inventor
庄悟 宮鍋
儀央 佐々木
裕行 内野
Original Assignee
パイオニア株式会社
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Priority to PCT/JP2008/056485 priority Critical patent/WO2009122566A1/fr
Publication of WO2009122566A1 publication Critical patent/WO2009122566A1/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • 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
    • G11B20/1816—Testing
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
    • 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
    • G11B20/1816—Testing
    • G11B2020/1823—Testing wherein a flag is set when errors are detected or qualified
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs

Definitions

  • the present invention relates to, for example, a reproduction apparatus and method for reproducing a data pattern recorded on a recording medium, and a technical field of a computer program that causes a computer to function as such a reproduction apparatus.
  • a reproducing apparatus various apparatuses for reproducing a data pattern by irradiating a recording medium such as an optical disc such as a CD, a DVD, a Blu-ray Disc, etc. with a laser beam are realized.
  • a recording medium such as an optical disc such as a CD, a DVD, a Blu-ray Disc, etc.
  • a laser beam a laser beam
  • a track on a recording medium is irradiated with laser light
  • a reflected light of the irradiated laser light is detected to detect a data pattern composed of marks and spaces. .
  • the data pattern can be reproduced.
  • a defect area (defect area) on the recording medium is detected and defect management (defect management) not using the detected defect area is performed.
  • defect management defect management
  • jitter is detected, and a defective area is detected based on whether or not the detected jitter has characteristics capable of withstanding recording or reproduction.
  • a defect area is detected based on a change in jitter, asymmetry, error rate, envelope waveform, or the like.
  • a mark that should originally be recorded so that the run length is 2T or 3T may be recorded as a mark with a run length of 2T or less than 3T.
  • the signal component of the mark having a run length of 2T or less than 3T may not intersect with the zero level (or the binarized slice level).
  • a mark with a run length of 2T or less than 3T does not contribute to the calculation of jitter and does not deteriorate the jitter. Therefore, the configurations disclosed in Patent Document 1 and Patent Document 2 described above have a technical problem that it is difficult or impossible to detect such a recording area as a defective area.
  • the fingerprint or the like since it remains the same that the fingerprint or the like is attached, it is needless to say that it is preferably detected as a defective area. Even if the recorded mark or space is recorded with the original run length, the same problem may occur when a fingerprint is attached during reproduction.
  • the present invention has been made in view of, for example, the above-described conventional problems, and an object of the present invention is to provide a playback apparatus and method that can suitably detect a defective area on a recording medium, for example, and a computer program. .
  • the reproducing apparatus of the present invention includes a plurality of types of mark signal components included in a read signal obtained by reading a data pattern from a recording medium and having different run lengths, and the read signal.
  • the detection means for detecting the appearance frequency of at least one signal component of a plurality of types of signal components included and having different run lengths, and the reading based on the amount of change in the appearance frequency of the at least one signal component
  • Determination means for determining whether or not the recording area on the recording medium from which the signal has been read is a defective area.
  • the reproducing method of the present invention includes a plurality of types of mark signal components included in a read signal obtained by reading a data pattern from a recording medium and having different run lengths, and the read signal.
  • the detection step of detecting an appearance frequency of at least one signal component of a plurality of types of signal components included and having different run lengths, and the reading based on a change amount of the appearance frequency of the at least one signal component A determination step of determining whether or not the recording area on the recording medium from which the signal has been read is a defective area.
  • a computer program includes a plurality of types of mark signal components included in a read signal obtained by reading a data pattern from a recording medium and having different run lengths, and the read signal.
  • the detection means for detecting the appearance frequency of at least one signal component of a plurality of types of signal components included and having different run lengths, and the reading based on the amount of change in the appearance frequency of the at least one signal component
  • a computer program for playback control that controls a computer provided in a playback device, comprising: a determination unit that determines whether or not a recording area on the recording medium from which a signal has been read is a defective area; To function as the detection means and the determination means.
  • FIG. 2 is a block diagram conceptually showing the basic structure of a reproducing apparatus in the example.
  • 6 is a flowchart conceptually showing a flow of operations of the reproducing apparatus in the example. It is a table
  • FIG. 10 is a block diagram conceptually showing the structure of a reproducing apparatus in a modified example.
  • the embodiment of the reproducing apparatus of the present invention includes signal components of a plurality of types of marks that are included in a read signal obtained by reading a data pattern from a recording medium and have different run lengths, and are included in the read signal and the run signal.
  • the read signal is read on the basis of detection means for detecting an appearance frequency of at least one signal component of signal components of a plurality of types of spaces having different lengths, and a change amount of the appearance frequency of the at least one signal component.
  • Determining means for determining whether or not the recording area on the recording medium is a defective area.
  • the appearance frequency of at least one signal component of a plurality of types of mark signal components and a plurality of types of space signal components is detected by the operation of the detection means.
  • the recording medium is a DVD
  • marks having run lengths from 3T to 11T and 14T are examples of “plural types of marks”.
  • a mark whose run length is 2T to 9T is an example of “a plurality of types of marks”.
  • spaces with run lengths from 3T to 11T and 14T are examples of “plural types of spaces”.
  • a space with a run length of 2T to 9T is an example of “a plurality of types of spaces”.
  • the change amount of the appearance frequency detected by the detection unit (for example, the change amount of the appearance frequency itself, the change amount with respect to the predetermined reference frequency, the difference from the predetermined reference frequency, Whether or not the recording area on the recording medium is a defective area is determined based on a magnitude relationship with respect to the reference frequency, a ratio with respect to the predetermined reference frequency, a deviation rate with respect to the predetermined reference frequency, and the like. That is, it is determined whether or not the recording area from which the read signal including at least one signal component whose appearance frequency has been detected by the detection unit is read is a defective area.
  • the “reference frequency” may typically indicate, for example, a predetermined fixed value, or each of a plurality of types of marks and a plurality of types of spaces when a normal recording operation is performed. The appearance frequency, etc. may be shown.
  • the above-described detection operation and determination operation for a read signal obtained in a defect region in which the transmittance with respect to laser light has fluctuated from the original transmittance, such as a defect region to which a fingerprint or the like is attached will be described.
  • a defect region in which the transmittance with respect to laser light has fluctuated from the original transmittance, such as a defect region to which a fingerprint or the like is attached.
  • the run length is originally minT (where “minT” indicates the shortest run length predetermined by the standard of the recording medium).
  • the mark to be recorded may be recorded as a mark having a run length of less than minT.
  • the recording of a mark having a run length of less than minT also leads to reading of a space having a run length of less than minT together with a mark having a run length of less than minT during reproduction. Furthermore, at the time of reproduction, the signal component of the mark or space whose run length is less than minT is shifted in the amplitude direction, so that it may not intersect with the zero level (or the binarized slice level). As a result, data patterns originally recorded as predetermined run-length marks and spaces are reproduced as a series of spaces. If such a space is connected to another run-length mark or space, the run-length of another run-length mark or space is also changed.
  • the frequency of appearance of the signal component of each mark or the frequency of appearance of the signal component of each space included in the read signal obtained in the defect area can vary. More specifically, the frequency of appearance of the signal component of each mark or the frequency of appearance of the signal component of each space included in the read signal obtained in the defect area is included in the read signal obtained in a normal area without defects.
  • the frequency of appearance of the signal component of each mark or the frequency of appearance of the signal component of each space may be different. In this case, since the signal component of the mark or space whose run length is less than minT does not intersect with the zero level (or the binarized slice level), the jitter does not deteriorate. In the configuration for detecting the defective area, the defective area cannot be detected.
  • the defect area can be suitably detected by taking into account the change amount of the appearance frequency detected by the detecting means by the operation of the determining means.
  • the reproducing apparatus it is possible to appropriately identify a defective region by referring to the appearance frequency of at least one signal component among a plurality of types of marks and a plurality of types of spaces having different run lengths. Can be detected.
  • the detecting means detects the appearance frequency of the signal component of the mark having the shortest run length, and the determining means determines the appearance frequency of the signal component of the mark having the shortest run length. Based on the amount of change, it is determined whether or not the recording area on the recording medium from which the read signal has been read is a defective area.
  • the mark having the shortest run length (for example, the recording medium is significantly affected) in the defect area in which the transmittance with respect to the laser beam fluctuates from the original transmittance, such as the defect area to which the fingerprint or the like is attached.
  • the run length is a 3T mark.
  • the defect area can be detected based on the appearance frequency of the run length 2T mark). it can. Therefore, the defect area can be detected with higher accuracy or more easily.
  • the detecting means detects the appearance frequency of the signal component of the space having the shortest run length
  • the determining means is the signal component of the space having the shortest run length. Whether the recording area on the recording medium from which the read signal has been read is a defective area is determined based on the change amount of the appearance frequency of.
  • the space having the shortest run length (for example, the recording medium is significantly affected) in the defect area where the transmittance with respect to the laser beam fluctuates from the original transmittance, such as the defect area to which the fingerprint or the like is attached.
  • the run length is a 3T space.
  • the defect area can be detected based on the appearance frequency of the run length is a 2T space). it can. Therefore, the defect area can be detected with higher accuracy or more easily.
  • the determination means includes the appearance frequency. May be determined that the recording area on the recording medium from which the read signal has been read is a defective area when is smaller than a predetermined ratio with respect to a predetermined reference frequency.
  • the originally intended run length is as described above.
  • the mark or space cannot be recorded.
  • a mark or space to be recorded as a mark or space with the shortest run length may be recorded as a mark or space with a shorter run length.
  • the appearance frequency of the mark or space having the shortest run length is reduced. Therefore, when the appearance frequency is smaller than the reference frequency by a predetermined ratio or more, it is possible to preferably detect the defect area by determining that the defect area is a defect area.
  • the detecting means detects an appearance frequency of a signal component having a relatively long run length included in the read signal, and the determining means Whether or not the recording area on the recording medium from which the read signal has been read is a defective area is determined based on the change amount of the appearance frequency of the signal component in the space having a relatively long run length.
  • a space having a relatively long run length (for example, if the recording medium is a DVD), the appearance frequency may vary due to a decrease in the appearance frequency of the mark or space having the shortest run length.
  • the run lengths are 7T to 11T and 14T spaces and the recording medium is a Blu-ray Disc, the defect area can be suitably detected based on the appearance frequency of the signal components of the run lengths 6T to 9T.
  • the detecting means detects an appearance frequency of a signal component of a space having the longest run length included in the read signal, and the determining means includes the run length. Whether or not the recording area on the recording medium from which the read signal is read is a defective area is determined based on the change amount of the appearance frequency of the signal component of the longest space.
  • a space having the longest run length that can vary due to a decrease in the appearance frequency of the mark or space having the shortest run length for example, a run length if the recording medium is a DVD.
  • the defect area can be suitably detected based on the appearance frequency of signal components having a run length of 8T or 9T.
  • the determination unit includes the determination unit When the appearance frequency is greater than a predetermined reference frequency by a predetermined ratio or more, the recording area on the recording medium from which the read signal is read may be determined to be a defective area.
  • the originally intended run is performed as described above. It becomes impossible to record length marks or spaces. As a result, a mark or space to be recorded as a mark or space with the shortest run length may be recorded as a mark or space with a shorter run length. Due to this, at the time of reproduction, a space with a shorter run length may be treated as a data pattern integrally connected to other spaces. As a result, the appearance frequency of a space having a relatively long or long run length increases. Therefore, when the appearance frequency is larger than the reference frequency by a predetermined ratio or more, it is possible to detect the defect region suitably by determining that the defect region is a defect region.
  • the detection means includes a violation run length mark different from a run length included in the read signal and predetermined by a standard, and the violation run length.
  • the frequency of appearance of at least one signal component of the space is detected, and the determination unit is configured to read the reading based on the amount of change in the frequency of appearance of the signal component of at least one of the violation run-length mark and the violation run-length space. It is determined whether or not the recording area on the recording medium from which the signal has been read is a defective area.
  • a mark or space to be recorded as a mark or space with the shortest (or longest) run length is a shorter or longer run length (i.e., a violation run length, for example, a record
  • the run length may be 2T or less, 12T, 13T, or 15T or more, and if the recording medium is a Blu-ray Disc, the run length may be 1T or less or 10T or more). In consideration of this, it is possible to detect the defect area suitably.
  • the determination unit includes the appearance frequency
  • the recording area on the recording medium from which the reading signal is read may be determined to be a defective area when the ratio is larger than a predetermined ratio with respect to a predetermined reference frequency.
  • the originally intended run length is as described above.
  • the mark or space cannot be recorded.
  • the appearance frequency of violation run-length marks or spaces increases. Therefore, when the appearance frequency is larger than the reference frequency by a predetermined ratio or more, it is possible to detect the defect region suitably by determining that the defect region is a defect region.
  • a sync pattern that includes each of the predetermined run-length mark and the predetermined run-length space substantially equally is recorded on the recording medium, and the detection means Detects the appearance frequency of the signal component of the mark of the predetermined run length included in the read signal and the signal component of the space of the predetermined run length included in the read signal, and the determination means
  • the recording area on the recording medium from which the read signal is read is defective based on the amount of change in the appearance frequency of the signal component of the mark of the predetermined run length with respect to the appearance frequency of the signal component of the space of the predetermined run length. It is determined whether it is an area.
  • the sync pattern includes a predetermined run-length mark and a predetermined run-length space approximately evenly when a normal recording operation is performed, while a predetermined run-length mark and a predetermined run-length when recorded in a defective area.
  • Each of the run length spaces may be unequal. Therefore, according to this aspect, the defective area can be suitably detected by reading the sync pattern.
  • the amplitude level of the read signal is limited by a predetermined amplitude limit value to obtain an amplitude limit signal, and high-frequency emphasis is applied to the amplitude limit signal.
  • An amplitude limiting filtering unit that obtains an equalization correction signal by performing filtering processing is further provided, wherein the determination unit includes the frequency of appearance of the at least one signal component included in the equalization correction signal. Whether or not the recording area on the recording medium from which the read signal has been read is a defective area is determined based on the amount of change in the appearance frequency of at least one signal component included in.
  • the amplitude level of the read signal is limited by the operation of the amplitude limit filtering means. Specifically, the signal level of the read signal whose amplitude level is larger than the upper limit or lower limit of the amplitude limit value is limited to the upper limit or lower limit of the amplitude limit value. On the other hand, the amplitude level of the signal component whose amplitude level is below the upper limit and below the lower limit of the amplitude limit value in the read signal is not limited.
  • the high-frequency emphasis filtering process is further performed on the read signal (that is, the amplitude limit signal) on which the amplitude level is thus limited. As a result, an equalization correction signal is acquired.
  • the appearance frequency of each mark or each space included in the equalization correction signal can be brought close to the original appearance frequency. Therefore, the defect region can be suitably detected by comparing the appearance frequency of each mark or each space included in the read signal with the appearance frequency of each mark or each space included in the equalization correction signal. it can.
  • the above-described operation can be performed on a wide variety of recording media or unknown recording media. Therefore, it is possible to detect a defective area in a variety of recording media or unknown recording media.
  • the embodiment according to the reproducing method of the present invention includes a plurality of types of mark signal components included in a read signal obtained by reading a data pattern from a recording medium and having different run lengths, and included in the read signal and the run signal.
  • the read signal is read based on a detection step of detecting an appearance frequency of at least one signal component of signal components of a plurality of types of spaces having different lengths, and a change amount of the appearance frequency of the at least one signal component.
  • the same effects as the various effects that can be enjoyed by the embodiment of the reproducing apparatus of the present invention described above can be enjoyed.
  • the embodiment of the playback method of the present invention can also take various aspects.
  • Embodiments according to the computer program of the present invention include signal components of a plurality of types of marks that are included in a read signal obtained by reading a data pattern from a recording medium and have different run lengths, and are included in the read signal and the run signal.
  • the read signal is read on the basis of detection means for detecting an appearance frequency of at least one signal component of signal components of a plurality of types of spaces having different lengths, and a change amount of the appearance frequency of the at least one signal component.
  • a reproducing apparatus comprising: a determination unit that determines whether or not the recording area on the recording medium is a defective area (that is, the embodiment according to the above-described reproducing apparatus of the present invention (including various aspects thereof))
  • a computer program for controlling playback that controls a computer provided in the computer, the computer comprising the detection means and the detection means To function as a constant means.
  • the computer program is read from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk that stores the computer program, and executed. If the computer program is downloaded to a computer via communication means and then executed, the above-described embodiment of the playback apparatus of the present invention can be realized relatively easily.
  • the embodiment of the computer program of the present invention can also adopt various aspects.
  • Embodiments according to the computer program product of the present invention are included in a read signal obtained by reading a data pattern from a recording medium and are included in the read signal and a plurality of types of mark signal components having different run lengths. Based on the detection means for detecting the appearance frequency of at least one signal component of the signal components of a plurality of types of spaces having different run lengths, and the read signal is read based on the amount of change in the appearance frequency of the at least one signal component.
  • a determination unit that determines whether or not the recording area on the recording medium is a defective area (that is, the above-described embodiment of the reproduction apparatus of the present invention (including various aspects thereof)
  • the program instructions executable by the computer provided in the above are clearly embodied, and the computer includes the detection means and the detection means. To function as a constant means.
  • the computer program product of the present invention if the computer program product is read into a computer from a recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk storing the computer program product, or
  • a recording medium such as a ROM, a CD-ROM, a DVD-ROM, and a hard disk storing the computer program product
  • the computer program product which is a transmission wave
  • the computer program product which is a transmission wave
  • the computer program product which is a transmission wave
  • the computer program product which is a transmission wave
  • the embodiment of the computer program product of the present invention can also adopt various aspects.
  • the detection device and the determination device are provided.
  • the method includes a detection step and a determination step.
  • the computer is caused to function as the embodiment of the playback apparatus of the present invention. Therefore, a defective area on the recording medium can be suitably detected.
  • FIG. 1 is a block diagram conceptually showing the basic structure of the reproducing apparatus in the example.
  • the reproducing apparatus 1 includes a spindle motor 10, a pickup (PU: PickPUp) 11, an HPF (High Pass Filter) 12, an A / D converter 13, An equalizer (Pre Equalizer) 14, a binarization circuit 16, a decoding circuit 17, a T frequency detection circuit 21, and a defect area detection circuit 22 are provided.
  • the pickup 11 photoelectrically converts reflected light when the recording surface of the optical disk 100 rotated by the spindle motor 10 is irradiated with the laser beam LB, and generates a read signal RRF .
  • the HPF 12 removes the low frequency component of the read signal R RF output from the pickup, and outputs the read signal R HC obtained as a result to the A / D converter 13.
  • the A / D converter 13 samples the read signal R HC in accordance with a sampling clock output from a PLL (Phased Lock Loop) (not shown) or the like, and outputs the read sample value series RS obtained as a result to the pre-equalizer 14. To do.
  • PLL Phase Lock Loop
  • Pre-equalizer 14 removes intersymbol interference based on the transmission characteristics of the composed information reading system from the pickup 11 and the optical disc 100, and outputs the resulting read sample value series RS C to the binary circuit 16.
  • Binarizing circuit 16 read binarizes to the sample value series RS C, and outputs a binary signal obtained as a result of the decoding circuit 17 and to each of T frequency detection circuit 21.
  • the decoding circuit 17 performs a decoding process on the binarized signal and outputs a reproduction signal obtained as a result to an external reproduction device such as a display or a speaker. As a result, a data pattern (for example, video data or audio data) recorded on the optical disc 100 is reproduced.
  • the T frequency detection circuit 21 constitutes a specific example of the “detection means” in the present invention, and detects the appearance frequency of marks and spaces included in the binarized signal for each run length.
  • the T frequency detection circuit 21 detects the appearance frequencies of marks with run lengths of 3T to 11T and 14T and spaces with run lengths of 3T to 11T and 14T.
  • the T frequency detection circuit 21 detects the appearance frequency of each of a mark having a run length of 2T to 9T and a space having a run length of 2T to 9T.
  • the defective area detection circuit 22 constitutes one specific example of the “determination means” in the present invention, and the T frequency detection circuit 21 is based on the appearance frequency of each mark and each space detected by the T frequency detection circuit 21. It is determined whether or not the recording area on the optical disc 100 on which the data pattern corresponding to the binarized signal that is the target of the detection operation is a defective area.
  • FIG. 2 is a flowchart conceptually showing a flow of operations of the reproducing apparatus 1 in the example.
  • the data pattern recorded on the optical disc 100 is reproduced (step S101). That is, the signal R RF read by the pickup 11 is generated, the read signal R HC from the read signal R RF by HPF12 is generated, A / D converter 13 by the reading from the read signal R HC sample value series RS is generated, pre The equalizer 14 generates a read sample value series RS C from the read sample value series RS, the binarization circuit 16 generates a binarized signal from the read sample value series RS C , and the decoding circuit 17 decodes the binarized signal. Processing is performed.
  • the appearance frequency (T frequency) of marks and spaces included in the binarized signal is detected for each run length by the operation of the T frequency detection circuit 21 (step S101). S102).
  • T frequency the appearance frequency of marks and spaces included in the binarized signal is detected for each run length by the operation of the T frequency detection circuit 21 (step S101).
  • S102 it is preferable to detect the appearance frequency for each predetermined reproduction period.
  • the appearance frequency of the mark with the shortest run length detected in step S102 (hereinafter, referred to as “shortest mark” as appropriate) is set to be higher than the reference frequency (reference appearance frequency). It is determined whether or not it is smaller than the ratio (step S103). That is, if the optical disc 100 is a DVD, it is determined whether or not the appearance frequency of the mark with the run length of 3T is smaller than the reference frequency of the mark with the run length of 3T by a predetermined ratio or more.
  • the optical disc 100 is a Blu-ray Disc, it is determined whether the appearance frequency of a mark with a run length of 2T is smaller than a reference frequency of a mark with a run length of 2T by a predetermined ratio or more.
  • the reference frequency is preferably an appearance frequency of each mark and each space when a predetermined data pattern or a random data pattern is recorded in a recording area having no defect on the optical disc 100.
  • the reference frequency may be stored in advance in a memory or the like included in the playback apparatus 1, may be recorded on the optical disc 100, or may be appropriately generated by the playback apparatus 1. Therefore, it is preferable that the defective area detection circuit 22 performs the determination operation in step S103 by reading the reference frequency stored in advance or recorded in advance.
  • the appearance frequency of each mark and each space in a defective area that affects recording or reproduction the appearance frequency of each mark and each space in a defective area that does not affect recording or reproduction, or normal It is preferable that an appropriate value is determined in advance experimentally, empirically, or using a simulation while considering the appearance frequency (that is, the reference frequency) of each mark and each space in the recording area.
  • the ratio of the appearance frequency of each mark and each space in the defect area that affects recording or reproduction to the reference frequency is an example of the predetermined ratio.
  • the value of the boundary between the appearance frequency of each mark and each space in the defect area that affects recording or reproduction and the appearance frequency of each mark and each space in the defect area that does not affect recording or reproduction, relative to the reference frequency is another example of the predetermined ratio. More specifically, for example, “50% (or several tens to several tens of percent)” is an example of the predetermined ratio. However, the predetermined ratio is not limited to this.
  • FIG. 3 is a table showing the reference frequency of each mark and each space.
  • the optical disc 100 a DVD in which data patterns are recorded using marks and spaces with run lengths from 3T to 11T and 14T, and marks and spaces with run lengths from 2T to 9T.
  • the Blu-ray Disc that records the data pattern using the will be described.
  • the appearance frequency of each mark and space is shown as a common value.
  • FIG. 3A shows a reference frequency (T appearance) of a run length mark or space in a 2 ECC block that does not take the run length into consideration when a random data pattern is recorded on a DVD which is a specific example of the optical disc 100. Probability).
  • the reference frequency of a mark or space with a run length of 3T is about 32%
  • the reference frequency of a mark or space with a run length of 4T is about 24%
  • the run length is 5T.
  • FIG. 3A shows a reference frequency in consideration of the run length of each run length mark or space in the 2 ECC block when a random data pattern is recorded on a DVD which is a specific example of the optical disc 100. Sample appearance probability) is shown. As shown in FIG. 3A, the reference frequency of a mark or space with a run length of 3T is about 20%, the reference frequency of a mark or space with a run length of 4T is about 20%, and the run length is 5T.
  • the mark or space reference frequency is about 18%, the run length 6T mark or space reference frequency is about 15%, the run length 7T mark or space reference frequency is about 11%,
  • the reference frequency of a mark or space with a run length of 8T is about 7.3%, the reference frequency of a mark or space with a run length of 9T is about 4.5%, and the reference frequency of a mark or space with a run length of 10T
  • the frequency is about 2.9%
  • the standard frequency of a mark or space with a run length of 11T is about 0.56%
  • the standard frequency of over scan is about 0.94%.
  • FIG. 3B shows a reference frequency that does not consider the run length of each run length mark or space in one ECC block when a random data pattern is recorded on a Blu-ray Disc that is a specific example of the optical disc 100. (T appearance probability) is shown. As shown in FIG. 3B, the reference frequency of a mark or space with a run length of 2T is about 38%, the reference frequency of a mark or space with a run length of 3T is about 25%, and the run length is 4T.
  • the mark or space reference frequency is about 16%
  • the run length 5T mark or space reference frequency is about 10%
  • the run length 6T mark or space reference frequency is about 6%
  • the reference frequency of a mark or space with a run length of 7T is about 3%
  • the reference frequency of a mark or space with a run length of 8T is about 1.6%
  • the reference frequency of a mark or space with a run length of 9T is about 0.35%.
  • FIG. 3B the run length of each run length mark or space in one ECC block when a random data pattern is recorded on a Blu-ray Disc, which is a specific example of the optical disc 100, is considered.
  • Reference frequency sample appearance probability
  • the reference frequency of a mark or space with a run length of 2T is about 23%
  • the reference frequency of a mark or space with a run length of 3T is about 22%
  • the run length is 4T.
  • the mark or space reference frequency is about 19%, the run length 5T mark or space reference frequency is about 15%, the run length 6T mark or space reference frequency is about 10%,
  • the reference frequency of a mark or space with a run length of 7T is about 6%, the reference frequency of a mark or space with a run length of 8T is about 3.9%, and the reference frequency of a mark or space with a run length of 9T is About 0.93%.
  • the reference frequency that does not consider the run length is a reference frequency in which the weight in calculating the reference frequency of the mark or space of each run length is the same in each run length. That is, when one mark or space of a certain run length appears, the reference frequency when the number of appearances is counted as one is shown.
  • the reference frequency in consideration of the run length is a reference frequency on which the weight in calculating the reference frequency of the mark or space of each run length depends on the run length. That is, when one mark or space of a certain run length appears, the reference frequency in the case where the number of appearances is counted by the number corresponding to the run length is shown.
  • the T frequency detection circuit 21 has one of two types of appearance frequencies (that is, an appearance frequency not considering run length and an appearance frequency considering run length). Or it is preferable to detect both. Moreover, it is preferable that the defective area detection circuit 22 determines whether or not the appearance frequency not considering the run length is smaller than the reference frequency not considering the run length by a predetermined ratio or more. Similarly, it is preferable that the defective area detection circuit 22 determines whether or not the appearance frequency considering the run length is smaller than the reference frequency considering the run length by a predetermined ratio or more.
  • step S103 when it is determined in step S103 that the appearance frequency of the shortest mark is not lower than the reference frequency by a predetermined rate (step S103: No), the data pattern including the shortest mark is read. It is determined that the recorded area is not a defective area.
  • step S105 it is determined whether or not to end the reproduction operation.
  • step S105 when it is determined not to end the reproduction operation (step S105: No), the process returns to step S101, and the operation after step S102 is repeated while continuing the reproduction operation.
  • step S105: Yes when it is determined that the reproduction operation is to be terminated (step S105: Yes), the reproduction operation is terminated.
  • step S103 when it is determined that the appearance frequency of the shortest mark is smaller than the reference frequency by a predetermined ratio (step S103: Yes), the recording in which the data pattern including the shortest mark is read is recorded. It is determined that the area is a defective area (step S104). Therefore, the recording area is set as a defective area, and other defect processing (for example, processing for saving a data pattern recorded in the defective area to another recording area) is performed as necessary. Thereafter, the process proceeds to step S105.
  • the recording area in which the transmittance of the laser light has changed from the original transmittance such as a recording area to which a fingerprint or the like is attached, will be described as an example of the defective area. Of course, it is needless to say that the defect region may be caused by other factors.
  • the jitter is equal to or greater than a predetermined value. That is, it may be configured to additionally determine whether or not the region is a defect region based on jitter.
  • FIG. 4 is a diagram showing the appearance frequency of the shortest mark in each of the normal region and the defect region together with the jitter.
  • FIG. 5 shows the state of the read signal R RF in each of the normal region and the defect region. It is a graph shown with a value-ized slice level.
  • FIG. 4 an example in which a Blu-ray Disc is used as the optical disc 100 will be described.
  • the appearance frequency of the shortest mark (that is, a mark having a run length of 2T) in the defect area to which a fingerprint or the like is attached is the appearance frequency of the shortest mark in a normal area (that is, an area where there is no defect such as a fingerprint). It is smaller than the frequency.
  • the jitter may deteriorate (see fingerprint state 1) or the jitter may not deteriorate (or be improved) (see fingerprint state 2). The reason for this will be described with reference to FIG.
  • the shortest mark can be suitably recorded in the normal area.
  • the signal waveform corresponding to each mark and each space included in the read signal R RF preferably crosses the binarized slice level. Therefore, the read signal R RF in this state is not determined to be a defective region even if determination based on either jitter or appearance frequency is performed.
  • the transmittance of the laser light is reduced due to the adhesion of the fingerprint. Therefore, when recording a data pattern in such a defective area, it becomes impossible to give the recording surface of the optical disc 100 the energy necessary for recording the mark of the run length that is originally intended. . This is particularly noticeable when a mark with a short run length is recorded. For this reason, for example, a mark that should originally be recorded as a mark having a run length of 2T may be recorded as a mark having a run length of 1T. That is, a relatively short mark is recorded. Therefore, the appearance frequency of the shortest mark in the defect area is reduced.
  • the read signal R RF obtained in the defect area corresponding to the fingerprint state 1 is particularly shifted to the signal component side corresponding to the space (that is, the upper side in FIG. 5). Assume that a signal component of the state is obtained. In this case, the jitter of the signal component corresponding to the shortest mark is deteriorated. As a result, as shown in FIG. 4, the jitter (that is, total jitter) of the read signal R RF as a whole deteriorates.
  • the read signal R RF obtained in the defect region corresponding to the fingerprint state 2 is such that the signal component corresponding to the shortest mark is a space until the signal component corresponding to the shortest mark does not intersect the binarized slice level. It is assumed that a signal component shifted to the signal component side corresponding to is obtained.
  • the jitter of the signal component corresponding to the shortest mark is no longer contributing to the calculation of jitter as the entire read signal R RF. Therefore, as shown in FIG. 4, the jitter of the read signal R RF as a whole is not deteriorated.
  • the defect area corresponding to the fingerprint state 2 cannot be detected.
  • the defect area is detected based on the appearance frequency of each mark and each space, the defect area corresponding to the fingerprint state 2 can be suitably detected.
  • the defective area is detected based on the appearance frequency of the shortest mark that is easily affected by a fingerprint or the like, the defective area can be detected with higher accuracy or more easily.
  • FIGS. 6A and 6B not only the shortest mark but also the frequency of appearance of a shortest run length space or another run length mark or space is defined as a normal region and a defective region. Can be different between.
  • FIG. 6A is a diagram showing the appearance frequency of each mark recorded with a normal recording power and a relatively low recording power
  • FIG. 6B is a diagram showing a normal recording power and a relative recording power. It is a figure which shows the appearance frequency of each space recorded with low recording power. Therefore, the defect area may be detected based on the frequency of appearance of the shortest run length or other run length marks or spaces.
  • the appearance frequency of the space having the shortest run length in the defect area may be smaller than the appearance frequency (that is, the reference frequency) of the space having the shortest run length in the normal area. Therefore, when the appearance frequency of the space having the shortest run length is smaller than the reference frequency by a predetermined ratio, the recording area from which the data pattern including this space is read may be determined as the defective area. .
  • the appearance frequency of a mark or space other than the mark or space having the shortest run length in the defect area is higher than the appearance frequency (that is, the reference frequency) of a mark or space other than the mark or space having the shortest run length in the normal area. Can be bigger.
  • the recording area from which the data pattern including the mark or space is read is a defective area. You may comprise so that it may determine.
  • FIG. 7 is a graph showing the appearance frequency of the space in each of the normal area and the defective area.
  • FIG. 7 an example in which a Blu-ray Disc is used as the optical disc 100 will be described.
  • the appearance frequency of the longest run-length space (that is, the run-length 9T space) in the defect area to which fingerprints or the like are attached is higher than the appearance frequency of the longest run-length space in the normal area. Can be bigger. This occurs for the following reasons. For example, a mark that should originally be recorded as a 2T mark with a run length is recorded as a 1T mark with a run length of 1T. If the spaces are connected, the run length may appear as a 9T space.
  • the recording area from which the data pattern including this space is read is determined to be the defective area. May be.
  • the defect area is detected based on the longest run length whose run length varies depending on the appearance frequency of the mark with the shortest run length that is susceptible to fingerprints, etc. In addition, it is possible to detect a defective area easily.
  • the run length (specifically, 1T or 10T or more) other than the run length (specifically, 2T to 9T) determined by the standard increases. is doing.
  • a run-length space of 10T or more may appear when a run-length 2T mark is recorded as a 1-T mark with a run length that is connected to another space.
  • the defect area may be detected based on the appearance frequency of a run-length space other than the run-length determined by the standard. In this case, when the appearance frequency of a run length space other than the run length defined in the standard is equal to or higher than a predetermined amount, it is determined that the recording area from which the data pattern including this space is read is a defective area. You may comprise.
  • FIG. 8 is a graph showing the appearance frequency of the mark in each of the normal area and the defective area. In FIG. 8, an example in which a Blu-ray Disc is used as the optical disc 100 will be described.
  • the defect area may be detected based on the appearance frequency of a run length mark other than the run length defined in the standard.
  • the appearance frequency of a run-length mark other than the run-length defined in the standard is a predetermined amount or more, it is determined that the recording area from which the data pattern including the mark is read is a defective area. You may comprise.
  • Blu-ray Disc which is a specific example of the optical disc 100, employs a data pattern including a run length 9T mark and a run length 9T space alternately as a sync pattern (synchronization pattern).
  • the defect area may be detected based on the appearance frequency of each of the mark having a run length of 9T and the space having a run length of 9T in the sync pattern. This example will be described with reference to FIG. FIG. 9 is a graph showing the difference in appearance frequency between the mark having a run length of 9T and the space having a run length of 9T in the sync pattern.
  • the appearance frequency of the mark having a run length of 9T and the space having a run length of 9T in the sync pattern are different.
  • the run length is The appearance frequency of the 9T space may increase with respect to the appearance frequency of the 9T mark.
  • the run length 9T may be reduced with respect to the appearance frequency of the mark having a run length of 9T.
  • FIG. 10 is a block diagram conceptually showing the structure of the reproducing apparatus 2 according to the modification.
  • the same referential mark is attached
  • the playback apparatus 2 is similar to the playback apparatus 1 described above, and includes a spindle motor 10, a pickup (PU: Pick Up) 11, an HPF (High Pass Filter) 12, and A A / D converter 13, a pre-equalizer 14, a binarization circuit 16, a decoding circuit 17, a T frequency detection circuit 21, and a defect area detection circuit 22 are provided.
  • the reproduction apparatus 2 includes a limit equalizer 15 between the pre-equalizer 14 and the binarization circuit 16.
  • Limit equalizer 15 constitutes one specific example of the "amplitude limiting filtering device" of the present invention, subjected to a high frequency emphasis processing to the read sample value series RS C without increasing the intersymbol interference, resulting the high-frequency enhanced read sample value sequence RS H obtained, and outputs it to the binary circuit 16.
  • the operation itself of the limit equalizer 15 is the same as the operation of the conventional limit equalizer. For details, see Japanese Patent No. 3459563.
  • the limit equalizer 15 is configured to be able to arbitrarily switch on and off.
  • the limit equalizer 15 is on the to the binarizing circuit 16, while the high-frequency emphasized read sample value series RS H is outputted, when the limit equalizer 15 is turned off, the binarizing circuit to 16, read sample value series RS C, which is the output of the pre-equalizer 14 is outputted.
  • the T frequency detection circuit 21 detects each of the appearance frequency when the limit equalizer 15 is on and the appearance frequency when the limit equalizer 15 is off.
  • the amplitude level of the read signal R RF is limited by a predetermined amplitude limit value. Specifically, the signal level of the read signal R RF whose amplitude level is larger than the upper limit or lower limit of the amplitude limit value is limited to the upper limit or lower limit of the amplitude limit value. On the other hand, the amplitude level of the signal component whose amplitude level is below the upper limit and above the lower limit of the amplitude limit value in the read signal R RF is not limited. By performing the amplitude limiting process in this manner, the amplitude limiting signal R LIM is generated. A high-frequency emphasis filtering process is performed on the amplitude limit signal R LIM .
  • the high-frequency emphasis filtering process is a process of increasing the signal level in the vicinity of the signal component corresponding to the mark or space having the shortest run length in the amplitude limit signal R LIM , for example.
  • high-frequency emphasized read sample value series RS H is generated.
  • the signal component of the mark or space with the shortest run length since the signal component of the mark or space with the shortest run length is emphasized, the signal component corresponding to the mark with the shortest run length does not intersect the binarized slice level (on the right side of FIG. 5). Even if the data pattern is recorded in (see the figure), the data pattern can be reproduced so that this signal component intersects the binarized slice level (see the figure on the left side of FIG. 5). That is, the signal component of the mark or space having the shortest run length in the so-called normal region can be output from the limit equalizer 15.
  • the defective area detection circuit 22 uses the appearance frequency detected in a state where the limit equalizer 15 is turned on as the reference frequency described above. That is, the defect area detection circuit 22 has an appearance frequency detected when the limit equalizer 15 is off larger or smaller than an appearance frequency detected when the limit equalizer 15 is on, or a predetermined value. A defective area is detected by determining whether the ratio is larger or smaller by a predetermined ratio.
  • the reproducing apparatus 2 since it is not necessary to previously store a table or the like indicating the reference frequency described above, the defect region based on the appearance frequency described above can be applied to the optical disc 100 for which the reference frequency is not set or the unknown optical disc 100. A detection operation can be performed.

Abstract

L'invention porte sur un appareil de reproduction (1) qui comprend des moyens de détection (21) pour détecter des fréquences d'apparition de composantes de signal de plusieurs types de marques et de composantes de signal de plusieurs types d'espaces ayant différentes longueurs de plage, qui sont comprises dans un signal de lecture lu à partir d'un support d'enregistrement (100), et des moyens de détermination (22) pour déterminer si la région d'enregistrement sur le support d'enregistrement à partir de laquelle le signal de lecture a été lu est une région défectueuse ou non.
PCT/JP2008/056485 2008-04-01 2008-04-01 Appareil et procédé de reproduction et programme d'ordinateur WO2009122566A1 (fr)

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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07320419A (ja) * 1994-05-25 1995-12-08 Toshiba Corp ビットストリーム・バイト化装置
JPH0961474A (ja) * 1995-08-29 1997-03-07 Sony Corp 信号測定方法及び信号測定装置
JP2001126264A (ja) * 1999-10-28 2001-05-11 Yokogawa Electric Corp 符号間干渉解析装置及び符号間干渉解析プログラムを記録した記録媒体
JP2003249038A (ja) * 2002-02-20 2003-09-05 Hitachi Ltd 欠陥検出方法および欠陥検出装置ならびに情報記録再生装置および磁気ディスク装置
JP2004005850A (ja) * 2002-05-31 2004-01-08 Toshiba Corp 記録媒体欠陥検出方法及び装置
JP2004234808A (ja) * 2003-02-03 2004-08-19 Matsushita Electric Ind Co Ltd 光ディスク装置およびオープンループゲイン制御方法
JP2005108314A (ja) * 2003-09-30 2005-04-21 Ricoh Co Ltd 信号処理ユニットとその検査方法
JP2005122884A (ja) * 2003-10-14 2005-05-12 Thomson Licensing Sa 記録媒体に対する欠陥の操作
JP2005339738A (ja) * 2004-05-28 2005-12-08 Matsushita Electric Ind Co Ltd 欠陥管理方法および情報記録媒体
JP2006012324A (ja) * 2004-06-28 2006-01-12 Shinano Kenshi Co Ltd 光ディスク装置検証システムおよび光ディスク装置検証プログラム
JP2006012231A (ja) * 2004-06-23 2006-01-12 Shinano Kenshi Co Ltd 光ディスク装置、光ディスク装置検証システムおよび光ディスク装置検証プログラム
JP2006012333A (ja) * 2004-06-28 2006-01-12 Shinano Kenshi Co Ltd 光ディスク装置制御プログラム、光ディスク制御システム、ホストコンピュータおよび光ディスク装置
JP2007323765A (ja) * 2006-06-02 2007-12-13 Sony Corp 再生装置、シンク信号検出方法

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07320419A (ja) * 1994-05-25 1995-12-08 Toshiba Corp ビットストリーム・バイト化装置
JPH0961474A (ja) * 1995-08-29 1997-03-07 Sony Corp 信号測定方法及び信号測定装置
JP2001126264A (ja) * 1999-10-28 2001-05-11 Yokogawa Electric Corp 符号間干渉解析装置及び符号間干渉解析プログラムを記録した記録媒体
JP2003249038A (ja) * 2002-02-20 2003-09-05 Hitachi Ltd 欠陥検出方法および欠陥検出装置ならびに情報記録再生装置および磁気ディスク装置
JP2004005850A (ja) * 2002-05-31 2004-01-08 Toshiba Corp 記録媒体欠陥検出方法及び装置
JP2004234808A (ja) * 2003-02-03 2004-08-19 Matsushita Electric Ind Co Ltd 光ディスク装置およびオープンループゲイン制御方法
JP2005108314A (ja) * 2003-09-30 2005-04-21 Ricoh Co Ltd 信号処理ユニットとその検査方法
JP2005122884A (ja) * 2003-10-14 2005-05-12 Thomson Licensing Sa 記録媒体に対する欠陥の操作
JP2005339738A (ja) * 2004-05-28 2005-12-08 Matsushita Electric Ind Co Ltd 欠陥管理方法および情報記録媒体
JP2006012231A (ja) * 2004-06-23 2006-01-12 Shinano Kenshi Co Ltd 光ディスク装置、光ディスク装置検証システムおよび光ディスク装置検証プログラム
JP2006012324A (ja) * 2004-06-28 2006-01-12 Shinano Kenshi Co Ltd 光ディスク装置検証システムおよび光ディスク装置検証プログラム
JP2006012333A (ja) * 2004-06-28 2006-01-12 Shinano Kenshi Co Ltd 光ディスク装置制御プログラム、光ディスク制御システム、ホストコンピュータおよび光ディスク装置
JP2007323765A (ja) * 2006-06-02 2007-12-13 Sony Corp 再生装置、シンク信号検出方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JISEDAI HIKARI: "Disk Kaitai Shinsho", NIKKEI BUSINESS PUBLICATIONS, INC, vol. 59, 7 October 2003 (2003-10-07), pages 70 - 71 *

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