WO2010073450A1 - 信号処理回路および光ディスク再生装置 - Google Patents
信号処理回路および光ディスク再生装置 Download PDFInfo
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- WO2010073450A1 WO2010073450A1 PCT/JP2009/005442 JP2009005442W WO2010073450A1 WO 2010073450 A1 WO2010073450 A1 WO 2010073450A1 JP 2009005442 W JP2009005442 W JP 2009005442W WO 2010073450 A1 WO2010073450 A1 WO 2010073450A1
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- wobble signal
- binarized wobble
- feature amount
- binarized
- unit
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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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
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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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0945—Methods for initialising servos, start-up sequences
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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
- G11B7/005—Reproducing
- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
Definitions
- the present invention relates to a signal processing circuit and an optical disc reproducing apparatus, and more particularly to a signal processing circuit and an optical disc reproducing apparatus for determining a tracking control polarity when reproducing information recorded on an optical disc.
- a disc-shaped recording medium called CD (Compact Disc), DVD (Digital Versatile Disk), or BD (Blu-ray Disc) is a pit called a pit or a chemical change (hereinafter referred to as a mark) of a phase change film.
- Information is recorded by forming a spiral shape from the inner periphery to the outer periphery.
- An optical disk reproducing apparatus using this disk-shaped recording medium (hereinafter referred to as an optical disk) irradiates the optical disk with laser light, determines the presence or absence of pits or marks from the amount of reflected laser light, and reproduces information.
- the optical disk reproducing apparatus performs rotation control for rotating the optical disk at a predetermined rotational speed, focus control for controlling the focal position of the laser on the recording surface of the optical disk, and recording in a spiral shape. Tracking control is performed to correctly scan the pits with laser light.
- FIG. 14 is a diagram for explaining the characteristics of the on-groove method and the in-groove method.
- the upper diagram in FIG. 14 is a diagram for explaining the feature of the on-groove method
- the lower diagram in FIG. 14 is a diagram for explaining the feature of the in-groove method.
- information (data) is recorded by forming, for example, a pit 705 on a groove 704 that is formed in a spiral shape on an optical disk and has wobbling as address information.
- the groove 704 is a groove formed on the optical disc, and information (data) is recorded thereon.
- the groove 704 is usually a convex groove when viewed from the direction in which laser light enters (hereinafter referred to as a light incident surface) (in the on-groove method).
- the land 703 is an area between the groove 704 and the groove 704.
- wobbling is waviness (meandering) formed in a groove so that the groove is wavy with a certain amplitude and spatial frequency.
- the groove 704 in which the pit 705 is formed is convex with respect to the light incident surface, whereas in the in-groove method, the groove 704 in which the pit 705 is formed. Is concave with respect to the light incident surface. For this reason, the polarity of the tracking error signal for performing the tracking control is reversed between the case where the tracking control is performed on the groove 704 in the on-groove method and the case where the tracking control is performed on the groove 704 in the in-groove method.
- FIG. 15 is a diagram for explaining the scanning of tracks on a disc recorded by the on-groove method.
- FIG. 15 shows a state where the beam spot of the laser beam scans the track when the optical disk is recorded by the on-groove method.
- a beam spot A indicates a beam spot when tracking control is performed with an on-groove tracking polarity
- a beam spot B indicates a beam spot when tracking control is performed with an in-groove tracking polarity.
- the pit 705 and the wobbling are recorded even when the beam spot A scans the track having the land 703 that is convex with respect to the light incident surface. Therefore, the wobbling and information (data) of the track cannot be acquired correctly.
- the wobbling and information (data) of the track cannot be acquired correctly.
- the wobbling and information (data) of the track are recorded. It can be read correctly.
- the optical disc reproducing apparatus can perform the tracking control without paying particular attention to the polarity of the tracking control.
- BD-R LTH low-price recording disk
- This BD-R LTH disc is recorded by the in-groove method according to the standard, and the polarity of tracking control when reproducing other BD-R discs that are not LTH discs is reversed to perform the playback control.
- the optical disk reproducing apparatus performs reproduction with the tracking control polarity wrong, the optical disk reproducing apparatus performs tracking control on a track on which no mark is formed, and reproduces desired information (data). I can't.
- FIG. 16 is a block diagram showing a conventional configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method.
- the 16 includes a tracking polarity determination unit 901, an optical disc 902, an optical pickup unit 903, a push-pull signal generation unit 904, a servo filter 909, and a drive unit 911.
- the tracking polarity determination unit 901 includes a wobble signal generation unit 905, an amplitude measurement unit 906, a determination unit 907, and a polarity determination unit 908.
- tracking is drawn in each of the on-groove side and the in-groove side of the optical disc 902, and the amplitude of each binarized wobble signal is measured. Based on the measurement result, the tracking polarity is determined by discriminating the side that can acquire a larger amplitude as a correct track.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide a signal processing circuit and an optical disc reproducing apparatus capable of shortening the time for discriminating the recording method of the optical disc.
- a signal processing circuit has a groove track and a land track, and wobbling frequency-modulated or phase-modulated so as to represent address information on the groove track on which data is recorded.
- a tracking polarity determining unit that determines a polarity when tracking control is performed on the formed optical disc, and the tracking polarity determining unit generates a wobble signal according to the shape of the wobbling, and
- a binarized wobble signal generation unit that generates a binarized wobble signal according to whether or not a value exceeds a threshold value, and a feature that measures a feature amount of the binarized wobble signal generated by the binarized wobble signal generation unit
- a feature quantity of the binarized wobble signal measured by the quantity measurement unit and the feature quantity measurement unit is predetermined. Characterized in that it has a determining section for determining whether or not having the characteristics, and a polarity determination unit configured to determine the polarity by the results judged by the judgment unit.
- the recording method of the optical disc is the on-groove method or the in-groove method from the measured feature value of the binarized wobble signal by performing the measurement of the binarized wobble signal once for the track. it can.
- a signal processing circuit capable of shortening the time for discriminating the recording method of the optical disc can be realized.
- the feature amount measuring unit measures a period of the binarized wobble signal as a feature amount of the binarized wobble signal.
- the feature amount measuring unit is configured to use, as the feature amount of the binarized wobble signal, a time when the binarized wobble signal in a predetermined cycle is a high level value and the binarized wobble in the predetermined cycle. You may measure the duty of the said binarized wobble signal which is ratio of the time when a signal is a low level value.
- the feature amount measurement unit may measure the longest time or the shortest time of a high level value within a predetermined time of the binarized wobble signal as the feature amount of the binarized wobble signal.
- the feature amount measuring unit may measure the longest time or the shortest time of the low level value within a predetermined time of the binarized wobble signal as the feature amount of the binarized wobble signal. .
- the feature amount measuring unit may determine the number of rises when the binarized wobble signal becomes a high level value within a predetermined time as the feature amount of the binarized wobble signal or the 2 times within the predetermined time. You may measure the frequency
- an optical disc reproducing apparatus has a groove track and a land track, and is frequency-modulated or phase-modulated to represent digital information on the groove track on which data is recorded.
- An optical pickup unit that reads information necessary for performing tracking control from an optical disk on which wobbling is formed, and a tracking polarity determination unit that determines polarity when performing tracking control from the information read by the optical pickup unit;
- a drive unit that performs tracking control of the optical pickup unit based on a control signal generated with the tracking control polarity determined by the tracking polarity determination unit, and the tracking polarity determination unit reads information read by the optical pickup unit From the shape of the wobbling Generated by the binarized wobble signal generating unit that generates a binarized wobble signal according to whether the value of the wobble signal exceeds a threshold value, and the binarized wobble signal generating unit.
- a feature amount measuring unit that measures a feature amount of the binarized wobble signal, and a determination unit that determines whether or not the feature amount of the binarized wobble signal measured by the feature amount measuring unit has a predetermined feature
- a polarity determining unit that determines the polarity based on the result determined by the determining unit.
- the feature amount measuring unit measures a period of the binarized wobble signal as a feature amount of the binarized wobble signal.
- the feature amount measuring unit is configured to use, as the feature amount of the binarized wobble signal, a time when the binarized wobble signal in a predetermined cycle is a high level value and the binarized wobble in the predetermined cycle. You may measure the duty of the said binarized wobble signal which is ratio of the time when a signal is a low level value.
- the feature amount measuring unit may measure the longest time or the shortest time of the high level value within a predetermined time of the binarized wobble signal as the feature amount of the binarized wobble signal.
- the feature amount measuring unit may measure the longest time or the shortest time of the low level value within a predetermined time of the binarized wobble signal as the feature amount of the binarized wobble signal.
- the feature amount measuring unit may determine the number of rises when the binarized wobble signal becomes a high level value within a predetermined time as the feature amount of the binarized wobble signal or the 2 times within the predetermined time. You may measure the frequency
- the present invention can be realized not only as an apparatus but also as an integrated circuit including processing means included in such an apparatus, or as a method using the processing means constituting the apparatus as a step. it can.
- the present invention it is possible to realize a signal processing circuit and an optical disc reproducing apparatus that can shorten the time for discriminating the recording method of the optical disc.
- the recording method can be determined by only one of the information on the on-groove side and the in-groove side, and the polarity can be determined by measuring the binary wobble signal only once. Thereby, it is possible to shorten the determination time for determining whether the optical disk is recorded by the in-groove method or the on-groove method.
- FIG. 1 is a block diagram showing a configuration of an optical disk reproducing apparatus for determining an optical disk recording method according to the present invention.
- FIG. 2 is a flowchart for explaining the operation of the tracking polarity determination unit in the present invention.
- FIG. 3 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the first embodiment.
- FIG. 4A is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 4B is a diagram for explaining a method for determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 4A is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 4B is a diagram for explaining a method for determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value
- FIG. 5 is a flowchart for explaining the operation of the tracking polarity determination unit in the first embodiment.
- FIG. 6 is a block diagram showing a configuration of an optical disk reproducing apparatus for determining an optical disk recording method in the second embodiment.
- FIG. 7A is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 7B is a diagram for explaining a method of determining whether the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 8 is a flowchart for explaining the operation of the tracking polarity determination unit in the second embodiment.
- FIG. 9 is a block diagram showing a configuration of an optical disc reproducing apparatus that determines an optical disc recording method according to the third embodiment.
- FIG. 10A is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 10B is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 11 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the fourth embodiment.
- FIG. 12A is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 12B is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 12A is a diagram for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- FIG. 12B is a diagram for explaining a method of determining whether or not the
- FIG. 13 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the fifth embodiment.
- FIG. 14 is a diagram for explaining the characteristics of the on-groove method and the in-groove method.
- FIG. 15 is a diagram for explaining track scanning in the on-groove method.
- FIG. 16 is a block diagram showing a conventional configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method.
- FIG. 1 is a block diagram showing a configuration of an optical disk reproducing apparatus for determining an optical disk recording method according to the present invention.
- the tracking polarity determination unit 101 includes a binarized wobble signal generation unit 105, a feature amount measurement unit 106, a determination unit 107, and a polarity determination unit 108.
- the optical disc 102 has a groove 704 and a land 703, and a wobbling that is frequency-modulated or phase-modulated to represent absolute address information is formed on a track of the groove 704 on which information (data) is recorded.
- the optical disk 102 may be recorded by an on-groove method or may be recorded by an in-groove method.
- the track of the groove 704 on which information (data) is recorded is a track that is a convex groove when viewed from the light incident surface.
- the track of the groove 704 on which information (data) is recorded is a track that is a concave groove when viewed from the light incident surface.
- the optical pickup unit 103 converts the reflected light amount of the laser light irradiated onto the optical disc 102 into voltage information and outputs the voltage information to the push-pull signal generation unit 104.
- the optical pickup unit 103 is controlled by the drive unit 111.
- the push-pull signal generation unit 104 generates a push-pull signal generated from the reflected light of the optical disc 102. That is, the push-pull signal generation unit 104 generates a push-pull signal from the voltage information input from the optical pickup unit 103, and outputs the generated push-pull signal to the tracking polarity determination unit 101.
- the push-pull signal is a signal used for detecting the amount of deviation from the center of the groove to the center of the laser spot, and is a signal used for tracking control that compensates for variations in the reflectance of the optical disc 102 and the like.
- the tracking polarity determination unit 101 determines the tracking polarity of the optical disc 102 from the push-pull signal input from the push-pull signal generation unit 104. After determining the tracking polarity, the tracking polarity determination unit 101 outputs the push-pull signal together with the determined tracking polarity information to the servo filter 109.
- the binarized wobble signal generation unit 105 generates a wobble signal from the push-pull signal input from the push-pull signal generation unit 104, and generates a binarized wobble signal from the generated wobble signal. Then, the binarized wobble signal generation unit 105 outputs the generated binarized wobble signal to the feature amount measurement unit 106.
- the wobble signal is a signal whose push-pull signal changes in the groove wobbling period.
- the feature quantity measurement unit 106 measures the feature quantity of the input binarized wobble signal and outputs the measured feature quantity to the determination unit 107.
- the feature amount is, for example, a cycle of a binarized wobble signal, a duty, or the like.
- the determination unit 107 determines whether the measured feature value indicates a predetermined feature determined by the standard of the optical disc 102.
- the determination unit 107 outputs a determination result indicating whether the measured feature amount indicates a predetermined feature to the polarity determination unit 108.
- the polarity determination unit 108 determines the polarity of the push-pull signal from the determination result input from the determination unit 107, and determines the tracking polarity based on the determined polarity of the push-pull signal.
- the polarity determination unit 108 outputs the push-pull signal input from the push-pull signal generation unit 104 to the servo filter 109 together with information on the determined tracking polarity.
- the servo filter 109 outputs a signal (feedback signal) for the drive unit 111 to perform tracking control from the tracking polarity information and the push-pull signal input by the tracking polarity determination unit 101 to the drive unit 111.
- the driving unit 111 performs tracking control on the optical pickup unit 103 in accordance with the input feedback signal.
- the optical disc playback apparatus 100 is configured.
- FIG. 2 is a flowchart for explaining the operation of the tracking polarity determination unit in the present invention.
- the binarized wobble signal generation unit 105 generates a binarized wobble signal from the push-pull signal generated from the reflected light of the optical disc 102 by the push-pull signal generation unit 104 (S101), and the generated binarized wobble signal The signal is output to the feature amount measuring unit 106.
- the feature quantity measuring unit 106 measures the feature quantity of the input binarized wobble signal (S102), and outputs the measured feature quantity to the determination unit 107.
- the determination unit 107 determines whether the measured feature value indicates a predetermined feature determined by the standard of the optical disc 102, and determines a determination result indicating whether the measured feature value indicates a predetermined feature. , Output to the polarity determination unit 108.
- the polarity determination unit 108 determines the polarity of the push-pull signal from the determination result input from the determination unit 107 (S103), and determines the tracking polarity based on the determined polarity of the push-pull signal (S104). .
- the tracking polarity determination unit 101 determines the tracking polarity.
- the present invention it is possible to determine whether the recording method of the optical disk 102 is the on-groove method or the in-groove method by performing only one measurement of the binary wobble signal of the currently scanned track.
- Embodiment 1 In the following Embodiment 1, a specific example of the characteristic amount of the binarized wobble signal will be described.
- the first embodiment is one of the embodiments in the present invention.
- FIG. 3 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the first embodiment.
- the tracking polarity determination unit 201 includes a binarized wobble signal generation unit 105, a polarity determination unit 108, a period measurement unit 206, and a determination unit 207. Elements similar to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the period measurement unit 206 measures the period of the binarized wobble signal input by the binarized wobble signal generation unit 105 and outputs the measured period to the determination unit 207.
- the cycle of the binarized wobble signal corresponds to the feature amount of the binarized wobble signal described above.
- the determination unit 207 determines whether or not the measured cycle is a cycle determined by the standard of the optical disc 102. Then, the determination unit 207 outputs a determination result indicating whether the measured period is a predetermined characteristic, that is, a period determined by the standard of the optical disc 102, to the polarity determination unit 108.
- the optical disc playback apparatus 200 is configured.
- 4A and 4B are diagrams for explaining a method for determining whether or not the feature value of the binarized wobble signal shows a predetermined feature value.
- the wobble signal 401 that can be acquired when the beam spot A is scanned along the track of the groove 704 in which the pit 705 is formed in FIG.
- a binarized wobble signal 403 is shown.
- the wobble signal 404 that can be acquired when the beam spot B is scanned along the track of the land 703 in FIG. 15 and the acquired wobble signal 404 are binarized by a threshold value 405 2.
- a valued wobble signal 406 is shown.
- the binarized wobble signal 403 obtained from the beam spot A that scans the track of the groove 704 shows a predetermined period, and rises and rises at a period 407 determined by the standard of the optical disc 102, for example. It continues to fall.
- the period here indicates the time from the rising 410 of the binarized wobble signal 403 as shown in FIG. 4A to the next rising 410.
- the binary wobble signal 406 obtained from the beam spot B that scans the track of the land 703 rises at various periods unlike the binary wobble signal 403 on the groove 704 side. , Repeated falling.
- FIG. 5 is a flowchart for explaining the operation of the tracking polarity determination unit in the first embodiment.
- the period measurement unit 206 measures the period of the input binarized wobble signal (S202), and outputs the measured period to the determination unit 207.
- the determination unit 207 determines whether or not the measured cycle is a cycle determined by the standard of the optical disc 102. Then, the determination unit 207 outputs a determination result indicating whether the measured period is a predetermined characteristic, that is, a period determined by the standard of the optical disc 102, to the polarity determination unit 108.
- the polarity determination unit 108 determines the polarity of the push-pull signal from the determination result input from the determination unit 207 (S203), and determines the tracking polarity based on the determined polarity of the push-pull signal (S204). .
- the tracking polarity determination unit 201 determines the tracking polarity.
- the first embodiment it is possible to determine whether the recording method of the optical disc 102 is the on-groove method or the in-groove method by performing only one measurement of the binary wobble signal of the currently scanned track. . Thereby, it is possible to realize an optical disc reproducing apparatus capable of shortening the time for discriminating the recording method of the optical disc.
- the push-pull signal may be generated by an analog signal that is an output signal from the optical pickup unit 103, or the output signal from the optical pickup unit 103 may be digitally converted by an ADC (analog / digital converter). It may be generated by digital calculation after conversion.
- ADC analog / digital converter
- a signal band limiting process using a BPF may be performed before the binarized wobble signal generation unit 105.
- a binary wobble signal is generated based on the signal that has passed through the BPF.
- FIG. 6 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the second embodiment.
- the tracking polarity determination unit 301 includes a binarized wobble signal generation unit 105, a polarity determination unit 108, a duty measurement unit 306, and a determination unit 307. Elements similar to those in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the optical disc playback apparatus 300 shown in FIG. 6 embodies the configuration of the tracking polarity determination unit 101 of the optical disc playback apparatus 100 shown in FIG. Specifically, the feature amount measurement unit 106 and the determination unit 107 in the tracking polarity determination unit 101 are embodied in the duty measurement unit 306 and the determination unit 307 in the tracking polarity determination unit 301.
- the duty measurement unit 306 measures the duty of the binarized wobble signal input by the binarized wobble signal generation unit 105 and outputs the measured duty to the determination unit 307.
- the duty of the binarized wobble signal corresponds to the characteristic amount of the binarized wobble signal described above, and the time (H section) in which the binarized wobble signal in the predetermined period is a high level value and the binary value. This is a ratio to the time (L section) in which the normalized wobble signal is a low level value.
- the determination unit 307 determines whether or not the measured duty is a duty determined by the standard of the optical disc 102. Then, the determination unit 307 outputs a determination result indicating whether the measured duty is a predetermined characteristic, that is, a duty determined by the standard of the optical disc 102, to the polarity determination unit 108.
- the optical disc playback apparatus 300 is configured.
- a method for determining the polarity of the push-pull signal by the tracking polarity determination unit 301 that is, a method for determining whether the recording method of the optical disc 102 is the on-groove method or the in-groove method will be described with an example.
- FIGS. 7A and 7B are diagrams for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- the wobble signal 401 that can be acquired when the beam spot A is scanned along the track of the groove 704 in which the pit 705 is formed in FIG.
- a binarized wobble signal 403 binarized by a threshold 402 is shown.
- the wobble signal 404 that can be acquired when the beam spot B is scanned along the track of the land 703 in FIG. 15 and the acquired wobble signal 404 are binarized by the threshold value 405.
- the binarized wobble signal 406 is shown.
- the binarized wobble signal 403 obtained from the beam spot A that scans the track on the groove 704 side shows a predetermined duty, for example, a duty determined by the standard of the optical disc 102. Repeated rising and falling.
- the duty here is the ratio of the H section 408 and the L section 409 of the binarized wobble signal as shown in FIG. 7A.
- the binarized wobble signal 406 obtained from the beam spot B that scans the track of the land 703 is different from the binarized wobble signal 403 of the groove 704, and rises and falls with various duties. It continues to fall.
- FIG. 8 is a flowchart for explaining the operation of the tracking polarity determination unit in the second embodiment.
- the binarized wobble signal generation unit 105 generates a binarized wobble signal from the push-pull signal generated from the reflected light of the optical disc 102 by the push-pull signal generation unit 104 (S301), and the generated binarized wobble signal The signal is output to duty measuring section 306.
- the duty measurement unit 306 measures the period of the input binarized wobble signal (S302), and outputs the measured period to the determination unit 307.
- the determination unit 307 determines whether or not the measured duty is a duty determined by the standard of the optical disc 102. Then, the determination unit 307 outputs a determination result indicating whether the measured duty is a predetermined characteristic, that is, a duty determined by the standard of the optical disc 102, to the polarity determination unit 108.
- the polarity determination unit 108 determines the polarity of the push-pull signal from the determination result input from the determination unit 307 (S303), and determines the tracking polarity based on the determined polarity of the push-pull signal (S304). .
- the tracking polarity determination unit 301 determines the tracking polarity.
- the second embodiment it is possible to determine whether the recording method of the optical disk 102 is the on-groove method or the in-groove method by performing only one measurement of the binary wobble signal of the currently scanned track. . Thereby, it is possible to realize an optical disc reproducing apparatus capable of shortening the time for discriminating the recording method of the optical disc.
- the push-pull signal may be generated by an analog signal that is an output signal from the optical pickup unit 103, or the output signal from the optical pickup unit 103 may be digitally converted by an ADC (analog / digital converter). It may be generated by digital calculation after conversion.
- ADC analog / digital converter
- a signal band limiting process using a BPF may be performed before the binarized wobble signal generation unit 105.
- a binary wobble signal is generated based on the signal that has passed through the BPF.
- FIG. 9 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the third embodiment.
- the tracking polarity determination unit 501 includes a binarized wobble signal generation unit 105, a polarity determination unit 108, a longest / shortest time measurement unit 506, and a determination unit 507. Elements similar to those in FIGS. 1, 3, and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the optical disc playback apparatus 500 shown in FIG. 9 embodies the configuration of the tracking polarity determination unit 101 of the optical disc playback apparatus 100 shown in FIG. Specifically, the feature amount measurement unit 106 and the determination unit 107 in the tracking polarity determination unit 101 are embodied in the longest / shortest time measurement unit 506 and the determination unit 507 in the tracking polarity determination unit 501.
- the longest / shortest time measuring unit 506 is the longest or minimum time of a high level value (or low level value) within a predetermined time of the binarized wobble signal input by the binarized wobble signal generation unit 105. The time is measured, and the measured longest time or minimum time is output to the determination unit 507.
- the longest time or the minimum time of the binarized wobble signal corresponds to the feature amount of the binarized wobble signal.
- the determination unit 507 determines whether the measured longest time or minimum time is within a predetermined range determined by the standard of the optical disc 102. Then, the determination unit 507 outputs a determination result indicating whether the measured longest time or minimum time is within a predetermined characteristic, that is, a predetermined range determined by the standard of the optical disc 102, to the polarity determination unit 108.
- the optical disc playback apparatus 500 is configured.
- a method for determining the polarity of the push-pull signal by the tracking polarity determination unit 501 that is, a method for determining whether the recording method of the optical disk 102 is the on-groove method or the in-groove method will be described with an example.
- FIG. 10A and FIG. 10B are diagrams for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- the binarized wobble signal 403 obtained from the beam spot A that scans the track of the groove 704 indicates the longest time and the shortest time of a high level value (or low level value), for example, an optical disc. It repeats with the length determined by the standard of 102.
- the binarized wobble signal 406 obtained from the beam spot B that scans the track of the land 703 does not indicate the longest time and the shortest time within the predetermined range as described above. Repeat for a long time. That is, unlike the binarized wobble signal 403 on the groove 704 side, an H interval indicating a time when the binarized wobble signal is a high level value and an L interval indicating a time when the binarized wobble signal is a low level value The length of takes various values.
- the current scanning is performed from the result of measuring the longest time or the shortest time of the high level value (low level value) in the binarized wobble signal of the currently scanned track. It can be determined whether the track is on the groove 704 side or the land 703 side. That is, it is possible to determine whether the recording method of the optical disc 102 is the on-groove method or the in-groove method based on a predetermined feature amount.
- the third embodiment it is possible to determine whether the recording method of the optical disc 102 is the on-groove method or the in-groove method by performing only one measurement of the binarized wobble signal of the currently scanned track. . Thereby, it is possible to realize an optical disc reproducing apparatus capable of shortening the time for discriminating the recording method of the optical disc.
- the push-pull signal may be generated by an analog signal that is an output signal from the optical pickup unit 103, or the output signal from the optical pickup unit 103 may be digitally converted by an ADC (analog / digital converter). It may be generated by digital calculation after conversion.
- ADC analog / digital converter
- a signal band limiting process using a BPF may be performed before the binarized wobble signal generation unit 105.
- a binary wobble signal is generated based on the signal that has passed through the BPF.
- Embodiment 4 is one of the embodiments in the present invention.
- FIG. 11 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the fourth embodiment.
- the tracking polarity determination unit 601 includes a binarized wobble signal generation unit 105, a polarity determination unit 108, a rising / falling counting unit 606, and a determination unit 607. Elements similar to those in FIGS. 1, 3, 6, and 9 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the optical disc reproducing apparatus 600 shown in FIG. 11 embodies the configuration of the tracking polarity determining unit 101 of the optical disc reproducing apparatus 100 shown in FIG. Specifically, the feature amount measurement unit 106 and the determination unit 107 in the tracking polarity determination unit 101 are embodied in a rising / falling count unit 606 and a determination unit 607 in the tracking polarity determination unit 601.
- the rising / falling counting unit 606 measures the number of rising or falling times of the binarized wobble signal input by the binarized wobble signal generation unit 105 and outputs the measured number of rising or falling times to the determination unit 607.
- the number of rises or falls of the binarized wobble signal corresponds to the feature amount of the binarized wobble signal.
- a rising edge means a time when the binarized wobble signal becomes a high level value
- a falling edge means a time when the binarized wobble signal becomes a low level value.
- the determination unit 607 determines whether the measured number of rises or falls is a value within a predetermined range determined by the standard of the optical disc 102. Then, the determination unit 507 outputs a determination result indicating whether the measured number of rises or falls is a predetermined feature, that is, a value in a predetermined range determined by the standard of the optical disc 102, to the polarity determination unit 108. To do.
- FIG. 12A and FIG. 12B are diagrams for explaining a method of determining whether or not the feature value of the binarized wobble signal indicates a predetermined feature value.
- the binarized wobble signal 403 obtained from the beam spot A that scans the track of the groove 704 repeats an H section 408 and an L section 409 having a predetermined length, for example, determined by a standard. . Therefore, the number of rises 410 and the number of fall 411 within an arbitrary time are values within a predetermined range.
- the binarized wobble signal 406 obtained from the beam spot B that scans the track of the land 703 is different from the binarized wobble signal 403 on the groove 704 side.
- the section 408 and the L section 409 are repeated. Therefore, the number of rises 410 and the number of fall 411 within an arbitrary time do not fall within a predetermined range.
- the current scanning is performed from the result of measuring the number of rising and falling times of the binarized wobble signal within a certain time in the binarized wobble signal of the currently scanned track. It can be determined whether the track is on the groove 704 side or the land 703 side. That is, it is possible to determine whether the recording method of the optical disk 102 is the on-groove method or the in-groove method by performing only one measurement of the binary wobble signal of the currently scanned track.
- the operation of the tracking polarity determination unit 601 for determining the tracking polarity is the same as in FIG.
- the binarized wobble signal is measured once by measuring the number of rising and falling times of the binarized wobble signal within a predetermined time in the currently scanned track. It is possible to determine whether the recording method of the optical disk 102 is the on-groove method or the in-groove method. Thereby, it is possible to realize an optical disc reproducing apparatus capable of shortening the time for discriminating the recording method of the optical disc.
- the push-pull signal may be generated by an analog signal that is an output signal from the optical pickup unit 103, or the output signal from the optical pickup unit 103 may be digitally converted by an ADC (analog / digital converter). It may be generated by digital calculation after conversion.
- ADC analog / digital converter
- a signal band limiting process using a BPF may be performed before the binarized wobble signal generation unit 105.
- a binary wobble signal is generated based on the signal that has passed through the BPF.
- FIG. 13 is a block diagram showing a configuration of an optical disc reproducing apparatus for discriminating an optical disc recording method in the fifth embodiment.
- the tracking polarity determination unit 701 includes a binarized wobble signal generation unit 105, a polarity determination unit 108, a period measurement unit 206, a duty measurement unit 306, a longest / shortest time measurement unit 506, and a rising / falling count.
- a unit 606 and a determination unit 707. 1, 3, 6, 9, and 11 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the optical disc playback apparatus 700 shown in FIG. 13 embodies the configuration of the tracking polarity determination unit 101 of the optical disc playback apparatus 100 shown in FIG.
- the binarized wobble signal is generated by the binarized wobble signal generation unit 105, and the period measuring unit 206, the duty measuring unit 306, the longest / shortest time measuring unit 506, and the rising / falling counting unit 606. And are input respectively.
- the period measurement unit 206 measures the period of the input binarized wobble signal
- the duty measurement unit 306 measures the duty of the input binarized wobble signal.
- the longest / shortest time measuring unit 506 measures the longest or shortest time of the input binarized wobble signal
- the rising / falling time counting unit 606 measures the number of rising or falling times of the input binarized wobble signal.
- the determination unit 707 determines whether the measured cycle is within a predetermined range, the measured duty is within a predetermined range, the measured longest or shortest time is within a predetermined range, or the measured number of rises or falls is predetermined. It is determined whether it is in the range.
- the polarity determination unit 108 determines the polarity of the push-pull signal from the determination result input from the determination unit 107, and determines the tracking polarity based on the determined polarity of the push-pull signal.
- four feature quantities are extracted from the binarized wobble signal. However, one or two or more feature amounts among these feature amounts may be selected and measured. In this case, the polarity of the push-pull signal is determined based on the selected and combined feature amount, and the tracking polarity is determined based on the determined polarity of the push-pull signal.
- the optical disc playback apparatus 700 is configured.
- the method for determining the polarity of the push-pull signal by the tracking polarity determining unit 701 and the operation for determining the tracking polarity by the tracking polarity determining unit 701 are the same as those described in the first to fourth embodiments. Description is omitted.
- the fifth embodiment it is possible to determine whether the recording method of the optical disc 102 is the on-groove method or the in-groove method by performing the measurement of the binarized wobble signal only once. Thereby, it is possible to realize an optical disc reproducing apparatus capable of shortening the time for discriminating the recording method of the optical disc.
- the push-pull signal may be generated by an analog signal that is an output signal from the optical pickup unit 103, or the output signal from the optical pickup unit 103 may be digitally converted by an ADC (analog / digital converter). It may be generated by digital calculation after conversion.
- ADC analog / digital converter
- a signal band limiting process using a BPF may be performed before the binarized wobble signal generation unit 105.
- a binary wobble signal is generated based on the signal that has passed through the BPF.
- the optical disk reproducing apparatus of the present invention has been described based on the embodiment, the present invention is not limited to this embodiment. Unless it deviates from the meaning of this invention, the form which carried out the various deformation
- the gist of the present invention is the same and is included in the scope of the present invention.
- the present invention can be used for a signal processing circuit and an optical disk reproducing device, and in particular, can be used for discriminating a recording method in the optical disk reproducing device.
- Optical disc playback apparatus 101, 201, 301, 501, 601, 701, 901 Tracking polarity determination unit 102, 902 Optical disc 103, 903 Optical pickup unit 104, 904 Push-pull signal generation Unit 105 binarized wobble signal generation unit 106 feature amount measurement unit 107, 207, 307, 507, 607, 707, 907 determination unit 108, 908 polarity determination unit 109, 909 servo filter 111, 911 drive unit 206 period measurement unit 306 Duty measurement unit 401, 404 Wobble signal 402, 405 Threshold value 403, 406 Binary wobble signal 407 Period 408 H section 409 L section 410 Rise 411 Fall 506 Longest / shortest time measurement Fixed part 606 Rising and falling counting part 703 Land 704 Groove 705 Pit 905 Wobble signal generating part 906 Amplitude measuring part
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
以下の実施の形態1で、2値化ウォブル信号の特徴量の具体例について説明する。なお、実施の形態1は、本発明における実施の形態の1つである。
実施の形態2では、2値化ウォブル信号の特徴量の別の具体例について説明する。なお、実施の形態2は、本発明における実施の形態の1つである。
実施の形態3では、2値化ウォブル信号の特徴量のさらに別の具体例について説明する。なお、実施の形態3は、本発明における実施の形態の1つである。
実施の形態4では、2値化ウォブル信号の特徴量のさらに別の具体例について説明する。なお、実施の形態4は、本発明における実施の形態の1つである。
実施の形態5では、実施の形態1~4に説明した2値化ウォブル信号の特徴量を選択的に測定できる場合の例について説明する。なお、実施の形態5は、本発明における実施の形態の1つである。
101、201、301、501、601、701、901 トラッキング極性決定部
102、902 光ディスク
103、903 光ピックアップ部
104、904 プッシュプル信号生成部
105 2値化ウォブル信号生成部
106 特徴量測定部
107、207、307、507、607、707、907 判定部
108、908 極性決定部
109、909 サーボフィルタ
111、911 駆動部
206 周期測定部
306 デューティ測定部
401、404 ウォブル信号
402、405 しきい値
403、406 2値化ウォブル信号
407 周期
408 H区間
409 L区間
410 立ち上がり
411 立ち下がり
506 最長・最短時間測定部
606 立ち上がり立ち下がりカウント部
703 ランド
704 グルーブ
705 ピット
905 ウォブル信号生成部
906 振幅測定部
Claims (13)
- グルーブトラックおよびランドトラックを有し、データが記録される前記グルーブトラックにアドレス情報を表すように周波数変調または位相変調されたウォブリングが形成されている光ディスクに対して、トラッキング制御を行う際の極性を決定するトラッキング極性決定部を備え、
前記トラッキング極性決定部は、
前記ウォブリングの形状に応じたウォブル信号を生成し、前記ウォブル信号の値が閾値を超えるか否かにより2値化ウォブル信号を生成する2値化ウォブル信号生成部と、
前記2値化ウォブル信号生成部によって生成された2値化ウォブル信号の特徴量を測定する特徴量測定部と、
前記特徴量測定部によって測定された前記2値化ウォブル信号の特徴量が、所定の特徴を有するか否かを判別する判別部と、
前記判別部によって判別された結果によって前記極性を決定する極性決定部とを有する
ことを特徴とする信号処理回路。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、前記2値化ウォブル信号の周期を測定する
ことを特徴とする請求項1に記載の信号処理回路。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、所定の周期における前記2値化ウォブル信号がハイレベルの値である時間および前記所定の周期における前記2値化ウォブル信号がローレベルの値である時間の比である前記2値化ウォブル信号のデューティを測定する
ことを特徴とする請求項1に記載の信号処理回路。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、前記2値化ウォブル信号の所定時間内におけるハイレベルの値である時間の最長時間または最短時間を測定する
ことを特徴とする請求項1に記載の信号処理回路。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、前記2値化ウォブル信号の所定時間内におけるローレベルの値である時間の最長時間または最短時間を測定する
ことを特徴とする請求項1に記載の信号処理回路。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、所定時間内における前記2値化ウォブル信号がハイレベルの値になる時である立ち上がりの回数または所定時間内における前記2値化ウォブル信号がローレベルの値になる時である立ち下がりの回数を測定する
ことを特徴とする請求項1に記載の信号処理回路。 - グルーブトラックおよびランドトラックを有し、データが記録される前記グルーブトラックにデジタル情報を表すように周波数変調または位相変調されたウォブリングが形成されている光ディスクから、トラッキング制御を行うために必要な情報を読み出す光ピックアップ部と、
前記光ピックアップ部が読み出した情報から、トラッキング制御を行う際の極性を決定するトラッキング極性決定部と、
前記トラッキング極性決定部により決定されたトラッキング制御の極性で生成された制御信号により前記光ピックアップ部のトラッキング制御を行う駆動部とを備え、
前記トラッキング極性決定部は、
前記光ピックアップ部が読み出した情報から、前記ウォブリングの形状に応じたウォブル信号を生成し、前記ウォブル信号の値が閾値を超えるか否かにより2値化ウォブル信号を生成する2値化ウォブル信号生成部と、
前記2値化ウォブル信号生成部によって生成された2値化ウォブル信号の特徴量を測定する特徴量測定部と、
前記特徴量測定部によって測定された前記2値化ウォブル信号の特徴量が所定の特徴を有するか否かを判別する判別部と、
前記判別部によって判別された結果によって前記極性を決定する極性決定部とを有する
ことを特徴とする光ディスク再生装置。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、前記2値化ウォブル信号の周期を測定する
ことを特徴とする請求項7に記載の光ディスク再生装置。 - 前記特徴量測定部は、前記2値化ウォブル信号の特徴量として、所定の周期における前記2値化ウォブル信号がハイレベルの値である時間および前記所定の周期における前記2値化ウォブル信号がローレベルの値である時間の比である前記2値化ウォブル信号のデューティを測定する
ことを特徴とする請求項7に記載の光ディスク再生装置。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、前記値化ウォブル信号の所定時間内におけるハイレベルの値である時間の最長時間または最短時間を測定する
ことを特徴とする請求項7に記載の光ディスク再生装置。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、前記値化ウォブル信号の所定時間内におけるローレベルの値である時間の最長時間または最短時間を測定する
ことを特徴とする請求項7に記載の光ディスク再生装置。 - 前記特徴量測定部は、
前記2値化ウォブル信号の特徴量として、所定時間内における前記2値化ウォブル信号がハイレベルの値になる時である立ち上がりの回数または所定時間内における前記2値化ウォブル信号がローレベルの値になる時である立ち下がりの回数を測定する
ことを特徴とする請求項7に記載の光ディスク再生装置。 - グルーブトラックおよびランドトラックを有し、データが記録される前記グルーブトラックにアドレス情報を表すように周波数変調または位相変調されたウォブリングが形成されている光ディスクに対して、トラッキング制御を行う際の極性を決定するトラッキング極性決定部の信号処理方法であって、
ウォブリングの形状に応じたウォブル信号を生成し、前記ウォブル信号の値が閾値を超えるか否かにより2値化ウォブル信号を生成する2値化ウォブル信号生成ステップと、
前記2値化ウォブル信号生成ステップにおいて生成された2値化ウォブル信号の特徴量を測定する特徴量測定ステップと、
前記特徴量測定ステップにおいて測定された前記2値化ウォブル信号の特徴量が、所定の特徴を有するか否かを判別する判別ステップと、
前記判別ステップにおいて判別された結果によって前記極性を決定する極性決定ステップとを有する
ことを特徴とする信号処理方法。
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