WO2005043537A1 - 記録方法、記録装置、プログラムおよび記録制御装置 - Google Patents
記録方法、記録装置、プログラムおよび記録制御装置 Download PDFInfo
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- WO2005043537A1 WO2005043537A1 PCT/JP2004/016238 JP2004016238W WO2005043537A1 WO 2005043537 A1 WO2005043537 A1 WO 2005043537A1 JP 2004016238 W JP2004016238 W JP 2004016238W WO 2005043537 A1 WO2005043537 A1 WO 2005043537A1
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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
- G11B7/006—Overwriting
- G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
-
- 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
- G11B7/0045—Recording
-
- 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
- G11B20/10009—Improvement or modification of read or write signals
-
- 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
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10268—Improvement or modification of read or write signals bit detection or demodulation methods
- G11B20/10287—Improvement or modification of read or write signals bit detection or demodulation methods using probabilistic methods, e.g. maximum likelihood detectors
- G11B20/10296—Improvement or modification of read or write signals bit detection or demodulation methods using probabilistic methods, e.g. maximum likelihood detectors using the Viterbi algorithm
-
- 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
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10481—Improvement or modification of read or write signals optimisation methods
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1816—Testing
- G11B20/182—Testing using test patterns
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
Definitions
- the present invention relates to a recording method, a recording device, a program, and a recording control device for recording information on a recording medium under one of a plurality of recording conditions.
- An optical disc device records digital information on an optical disc by irradiating the optical disc with a laser beam.
- the optical disk device and the optical disk have individual differences, the quality of a signal recorded on the optical disk deteriorates.
- test recording of signals is performed when an optical disk is mounted on an optical disk device, and for example, irradiation power and optical pulse shape are optimized.
- FIG. 10 shows a configuration of a conventional optical disc device 400.
- the optical disk device 400 is configured so that the optical disk 401 can be mounted.
- the optical disc device 400 includes an optical head 402, a reproducing unit 404, a demodulating ECC circuit 406, a recording condition determining unit 408, a recording compensation circuit 409, a laser driving circuit 412, and a recording power setting unit 411. Is provided.
- Recording condition determining means 408 determines a recording pulse position and a recording power.
- the recording compensation circuit 409 sets the recording pulse position according to the determination of the recording condition determining means 408.
- the recording power setting means 411 sets the recording power according to the determination of the recording condition determining means 408.
- the laser drive circuit 412 controls the optical head 402 so that the optical head 402 performs a predetermined test recording on the optical disc 401.
- the laser drive circuit 412 controls the optical head 402 so that the optical head 402 reproduces a signal recorded on the optical disk 401.
- the reproduction signal 403 is input to the reproduction means 404.
- FIG. 11 shows a configuration of the reproducing unit 404.
- the reproduction means 404 includes a preamplifier 501, an equalizer 502, a low-pass filter 503, a binarization circuit 505, a PLL (Phase Locked Loop) 507, an edge interval measurement circuit 508, And a jitter operation circuit 510.
- a preamplifier 501 an equalizer 502, a low-pass filter 503, a binarization circuit 505, a PLL (Phase Locked Loop) 507, an edge interval measurement circuit 508, And a jitter operation circuit 510.
- PLL Phase Locked Loop
- the preamplifier 501 amplifies the reproduction signal 403, and the equalizer 502 and the low-pass filter 503 equalize the waveform of the amplified reproduction signal 403 to generate a signal 504.
- the binarization circuit 505 generates a pulse signal 506 based on the signal 504 and the slice level.
- the binary circuit 505 operates in a slice level band of usually several ⁇ such that the integral value of the mark is equal to the integral value of the space.
- the pulse signal 506 is input to the PLL 507.
- FIG. 12 shows the configuration of the PLL 507.
- the PLL 507 is provided with a phase comparator 601, a low-pass filter 602, a VCO 603, a flip-flop 605, a frequency divider 606, and a gate circuit 607.
- Phase comparator 601 detects a difference between the phase of pulse signal 506 and the phase of signal 608 output from gate circuit 607.
- the phase comparator 601 generates an error signal indicating a phase difference and a frequency difference between the pulse signal 506 and the signal 608.
- the low-pass filter 602 extracts only the low-frequency component of the error signal and generates a control signal indicating the control voltage of the VCO 603.
- VCO 603 generates clock signal 604 based on the control voltage.
- the frequency dividing circuit 606 divides the frequency of the clock signal 604.
- the gate circuit 607 generates a signal 608 based on the divided clock signal 604.
- VCO 603 is controlled so that the phases of two signals (pulse signal 506 and signal 608) input to phase comparator 602 are equal.
- PLL 507 generates signal 405 based on pulse signal 506.
- the edge interval measurement circuit 508 When the pulse signal 506 output from the binarization circuit 505 and the signal 405 output from the flip-flop 605 are input to the edge interval measurement circuit 508, the edge interval measurement circuit 508 The pulse edge intervals tO, tl, t2, t3, t4, t5, t6, t7, t8, t9 '... Are measured, and a signal 509 indicating the edge interval is output to the jitter calculation circuit 510 (see FIG. 13).
- Jitter operation circuit 510 integrates the edge interval.
- FIG. 14 shows a distribution of edge intervals.
- the jitter calculation circuit 510 calculates the standard deviation based on, for example, the distribution of the edge intervals, and outputs a signal 407 indicating the calculation result to the recording condition determination unit 408.
- the recording condition determining means 408 determines the optimum recording condition based on the signal 407. To explore.
- Patent Document 1 JP-A-2000-200418
- the present invention has been made in view of the above problems, and has as its object to provide a recording method for performing recording even when the shortest mark length is shorter than before.
- the recording method of the present invention is a recording method for recording information on a recording medium under one of a plurality of recording conditions, wherein (a) a plurality of test information is recorded under the plurality of recording conditions. And (b) recording the information on the recording medium under one of the plurality of recording conditions, wherein the step (b) comprises: b-1) a step of calculating a difference between each of the plurality of test signals obtained by reproducing the plurality of test information recorded on the recording medium and at least one desired signal; (b-2) And) selecting one of the plurality of recording conditions by referring to the divergence, whereby the object is achieved.
- the step (a) may include (a-1) determining an initial condition, and (a-2) determining at least one recording condition based on the initial condition. Good.
- the plurality of recording conditions include the initial condition and the determined at least one recording condition.
- the step (b-1) comprises the steps of: obtaining the plurality of test signals by reproducing the plurality of test information from the recording medium; and performing maximum likelihood decoding of the plurality of test signals. Generating a plurality of binarized signals indicating a result of the maximum likelihood decoding; and calculating reliability of the result of the maximum likelihood decoding based on the plurality of test signals and the plurality of binarized signals.
- the calculating step (b-2) includes selecting one of the plurality of recording conditions based on the plurality of values indicating the reliability. Hey.
- the step (b-2) may include a step of selecting a recording condition corresponding to a minimum value among the plurality of values indicating the reliability among the plurality of recording conditions.
- the step (b-1) includes a step of obtaining the plurality of test signals by reproducing the plurality of test information from the recording medium, and a step of obtaining a plurality of test signals based on each of the plurality of test signals. And calculating a plurality of indices indicating the reliability of the plurality of test signals based on each of the plurality of test signals and the plurality of paths.
- the step (b-2) may include a step of selecting one of the plurality of recording conditions based on the plurality of indices,
- the step (b-2) may include a step of selecting a recording condition corresponding to a minimum value of the plurality of indices among the plurality of recording conditions.
- the plurality of recording conditions may be assigned a priority to be selected.
- the step (b) comprises the steps of: determining a relative position of a plurality of light pulses included in light according to the selected one recording condition; and irradiating the recording medium with the light. Forming a plurality of recording marks having a predetermined length on the recording medium.
- the plurality of recording marks having the predetermined length may include a shortest recording mark.
- the plurality of recording marks having the predetermined length may include a recording mark next to the shortest recording mark.
- the relative positions of a plurality of light pulses included in the light are determined in accordance with the length of a plurality of recording marks formed on the recording medium for recording the information on the recording medium. And recording the information by irradiating the recording medium with the light.
- the relative positions of the plurality of optical pulses may be determined according to the length of the shortest recording mark among the plurality of recording marks.
- the relative positions of the plurality of light pulses may be determined according to the length of the longest recording mark next to the shortest recording mark among the plurality of recording marks.
- the initial condition may be recorded on the recording medium at the time of producing the recording medium.
- the method may further include a step of determining a predetermined recording condition based on at least one of the edge shift amount and the jitter. Note that the predetermined recording condition is included in the plurality of recording conditions.
- the step (a-1) may include a step of determining the predetermined recording condition as the initial condition.
- the recording apparatus of the present invention is a recording apparatus that records information on a recording medium under one of a plurality of recording conditions, wherein the plurality of test information is recorded under the plurality of recording conditions.
- the program of the present invention is a program for causing a computer to execute a recording process of recording information on a recording medium under one of a plurality of recording conditions.
- the step (b) comprises: (b-1) each of a plurality of test signals obtained by reproducing a plurality of test information recorded on the recording medium and at least one desired signal; And (b-2) selecting one of the plurality of recording conditions by referring to the deviation, whereby the object is achieved.
- the recording control device of the present invention records information under one of a plurality of recording conditions.
- a recording control device for recording on a recording medium wherein a deviation between each of a plurality of test signals obtained by reproducing a plurality of test information recorded on the recording medium and at least one desired signal.
- the recording device, the program, and the recording control device of the present invention a difference between a plurality of test signals obtained by reproducing a plurality of test information and a desired signal is calculated, and a plurality of recordings are performed. Select one of the recording conditions. Therefore, in order to match one recording condition with a desired signal condition, information is recorded on a recording medium under conditions close to the desired signal condition only by selecting one recording condition from a plurality of recording conditions. be able to. As a result, the recording parameters can be optimized with a simple circuit configuration.
- test recording is performed before recording user data, and user data is recorded under the condition that the PRML error index M becomes small. U, can record.
- test recording is performed before recording user data, and recording of user data is performed under the condition that the PRML error index M is small, thereby achieving variation in optical disc quality. And data that is not affected by variations in the quality of optical disc devices.
- FIG. 1 is a state transition diagram A showing a state transition rule defined by a recording code having a minimum polarity inversion interval of 2 and an equalization method PR (1, 2, 2, 1).
- FIG. 2 is a trellis diagram that can be obtained by developing state transition diagram A along a time axis.
- FIG. 3 is a diagram showing a distribution of Pa—Pb.
- FIG. 4 is a diagram showing a configuration of an optical disc device 100 according to an embodiment of the present invention.
- FIG. 5 is a diagram showing a configuration of an optical disc 101.
- FIG. 6 is a diagram showing a waveform of light emitted by the optical head 102 during recording.
- FIG. 7 is a diagram showing a test signal recorded on an optical disc in order to optimize a pulse position of a 3T mark.
- FIG. 8 is a diagram for explaining a procedure for determining a plurality of conditions for optimizing a pulse position.
- FIG. 9 is a diagram showing a configuration of a reproducing unit 104.
- FIG. 10 is a diagram showing a configuration of a conventional optical disk device 400.
- FIG. 11 is a diagram showing a configuration of a reproducing unit 404.
- FIG. 12 is a diagram showing a configuration of a PLL 507.
- FIG. 13 is a diagram showing signals generated by a plurality of components included in the reproducing means 404.
- FIG. 14 is a diagram showing distribution of edge intervals.
- FIG. 15 is a diagram showing a distribution of edge intervals.
- index M a PRML error index M (hereinafter, referred to as “index M”) referred to by the optical disc device according to the embodiment of the present invention will be described (see “1. About index M”), The details of the optical disc device according to the embodiment of the present invention will be described (see “2. Optical disc device according to embodiment of the present invention”).
- the maximum likelihood decoding method generally determines a waveform pattern of a reproduction signal by comparing the waveform of the reproduction signal with a previously estimated waveform, and decodes the reproduction signal based on the determination result. This is a decoding method.
- the minimum polarity reversal interval of the recording code is 2, and the waveform of the signal is shaped so that the frequency characteristic of the signal becomes PR (1, 2, 2, 1) equalization. .
- the recording code at the current time is b
- the recording code one time before is b
- the recording code two times before is k k-1
- the value Level is expressed by (Equation 1).
- k is an integer representing time
- V is an integer from 0-6.
- Table 1 is a state transition table in which the state at time k is represented by S (b, b, b).
- Table 1 State transition table determined by minimum inversion interval 2 and PR (1 2, 2 1) constraints
- FIG. 1 is a state transition diagram A showing a state transition rule determined by a recording code having a minimum polarity inversion interval of 2 and an equalization method PR (1, 2, 2, 1). State transition diagram A can be obtained by referring to Table 1.
- SO indicates the state S (0, 0, 0) at time k
- S1 indicates the state S (0, 0, k k k at time k
- S2 indicates the state S (0, 1, 1) at time k
- S3 indicates the state k k k k at time k
- S (l, 1, 1), S4 indicates state S (l, 1, 0) at time k, and S5 at time k
- FIG. 2 is a trellis diagram that can be obtained by developing the state transition diagram A along the time axis.
- Figure 2 shows the state S k k-4
- path A and path B Two state transition sequences (path A and path B) that can be taken between 0 and state S2 are shown. Transition of path A 4
- transition is state S2, state S4, state S5, state SO, and state SO.
- Path B transition is state S2, state S4, state S5, state SO, and state SO.
- (C, C, C, C, C, C, C) is the maximum k-6 k-5 k-4 k-3 k—2 k—1 k from time k6 to time k.
- Pa ⁇ Pb indicates the reliability of the maximum likelihood decoding result.
- FIG. 3 shows the distribution of Pa—Pb.
- Pa ⁇ Pb the maximum likelihood decoder selects path A with a high probability.
- Pa Pb
- the maximum likelihood decoder selects path B with a high probability.
- Pa Pb
- the probability of selecting path B is 50%, the decoding result of the maximum likelihood decoding unit is correct, and the probability is 50%.
- the Pa-Pb distribution is obtained by calculating Pa-Pb based on the decoding result a predetermined number of times or a predetermined number of times.
- FIG. 3A shows the distribution of Pa—Pb calculated based on the reproduced signal on which noise is superimposed.
- FIG. 3 (b) shows the distribution of I Pa—Pb I Pstd. Find the standard deviation and average value Pave of the distribution shown in Fig. 3 (b). Assume that the distribution shown in Fig. 3 (b) is a normal distribution. , And the error probability P ( ⁇ , Pave) is expressed as (Equation 3).
- the average value Pave and the standard deviation ⁇ can be used as indices of the reproduced signal quality.
- I Pa-Pb I Pstd the value of I Pa-Pb I Pstd will be less than or equal to a predetermined reference value. It is also possible to count a certain number of times and use the counted number as an index of signal quality.
- Table 2 Combinations of the shortest state transitions that can take two transitions
- Pa-Pb (E k 3 -F k 3 ) + (D k 2 -F k 2 ) + (B k -D k ) + (A k -B k )
- Pa-Pb (F k — 3 -G k _ 3 ) + (D k — 2 -F k _ 2 ) + (B k —Factory D k — XA Bj
- Pa-Pb (E k 3 -F k 3 ) + (D k 2 -F k 2 ) + (B k ,-D k ,) + (B k -C k )
- Pa-Pb (F k — 3 -G k — 3 ) + (D k — 2 -F k — 2 ) + (B k —Factory Dk—XBk-Ck)
- Pa-Pb (A k 3 -B k (B k 2 -D k 2 ) + (D k -F k ) + (E k -F k )
- Pa-Pb (B k 3 -C k 3 ) + (B k 2 -D k 2 ) + (D kl -F k 1 ) + (E k -F k )
- Pa-Pb (A k 3 -B k (B k 2 -D k 2 ) + (D k -F k ) + (F k -G k )
- Pa-Pb (B k _ 3 -C k _ 3 ) + (B k _ 2 -D k _ 2 ) + (D k _ 1 -F k —,) + (F k -G k )
- index 6 can be used as an index indicating the quality of
- index M can be defined as (index 6) as an index M.
- index M for evaluating a reproduced signal based on the maximum likelihood decoding method
- FIG. 4 shows a configuration of the optical disc device 100 according to the embodiment of the present invention.
- Reference numeral 100 denotes a configuration in which the optical disk 101 can be mounted.
- FIG. 5 shows the configuration of the optical disc 101.
- the optical disc 101 has a groove track 601 formed thereon.
- the shape of the groove track 601 is, for example, a snail shape or a concentric shape.
- the groove track 601 includes a recording area.
- the optical disc device 100 includes an optical head 102, a reproducing unit 104, a demodulating ECC circuit 106, a recording condition determining unit 108, a recording compensating circuit 109, a recording power setting unit 111, and a laser driving circuit 112. I can.
- FIG. 6 shows a waveform of light emitted by the optical head 102 during recording.
- data of the Run Length Limited (1, 7) modulation method is recorded by the mark edge recording method.
- the recording method is not limited to the mark edge recording method, but may be another recording method.
- the parameters of the light waveform include a parameter indicating the recording power and a parameter indicating the pulse position.
- Parameters indicating the recording power include peak power (Pw), bias power (Pe), and bottom power (Pbw).
- Parameters indicating the pulse position include Ttop, dTtop, Tmp, and dTe.
- the rising position of the pulse having the width Tmp and the starting point of d Ttop of the leading pulse are reference positions that define the relative relationship with the original signal.
- the number of pulses is adjusted according to the length of the mark formed on the optical disc 101.
- the 2T mark is recorded with one pulse
- the 3T mark is recorded with two pulses.
- the number of pulses increases by one as the mark formed on the optical disc 101 becomes longer by 1T.
- the optical disc device 100 records information on the optical disc 101 under one of a plurality of recording conditions.
- each of the plurality of recording conditions indicates a parameter of a light waveform.
- the optical head 102 is controlled to move to a test area included in the optical disk 101. Is done. In the test area, the optimum recording power and Test information for setting the optimum pulse position is recorded.
- the test area is not limited to being provided at the innermost circumference of the optical disc 101, for example, as long as the test area is a recording area other than a user area for recording data by a force provided at the innermost circumference of the optical disc 101. .
- the test area may be provided on the outermost circumference of the optical disc 101, for example.
- the recording power setting means 111 sets the initial values of the recording power (the initial values of the peak power, the noise power, and the bottom power) in the laser drive circuit 112.
- the initial value of the recording power is previously recorded on the optical disk 101 at the time of manufacturing the optical disk 101, but when the optical disk 101 is mounted on the optical disk device 100, the initial value of the recording power is calculated by test recording and calculated. An initial value can be recorded on the optical disc 101.
- the initial value of the recording power previously recorded on the optical disc 101 when the optical disc 101 is manufactured is supplied to the laser drive circuit 112.
- the optical disc quality and the optical disc device quality are determined in consideration of the variation, and based on this value, it is possible to perform good recording with the SZN ratio secured.
- the recording compensation circuit 109 sends a signal 110 to the laser drive circuit 112.
- the laser drive circuit 112 generates a pulse train signal 113 shaped according to the length of the mark to be recorded, based on the signal 110.
- the laser drive circuit 112 sends the pulse train signal 113 to the optical head 102, and the optical head 102 performs test recording of a test signal on the optical disk 101 based on the pulse train signal 113.
- the output light of the semiconductor laser provided in the optical head 102 is focused on the optical disc 101 as a light spot, and the semiconductor laser forms a recording mark on the optical disc 101 in accordance with the emission waveform. Details of the test signal will be described later.
- the test area Before the test recording, the test area can be recorded only with the bias power. By recording only with the no-power, the signal recorded in the test area before the test recording is erased from the test area, so that the influence of the signal recorded in the test area before the test recording on the test recording may be reduced. Can be reduced.
- the wavelength of the laser beam from the optical head 102 is about 405 nm, and the NA (Numerical Aperture) of the objective lens is about 0.85.
- the shortest mark length is about 0.16 microns is there.
- FIG. 7 shows a test signal recorded on the optical disc in order to optimize the pulse position of the 3T mark.
- the test signal has various conditions and is test-recorded on a groove track.
- the groove track is included in the test area.
- Test signals are recorded on the groove track under a plurality of conditions.
- this groove track includes a test signal A having a condition A, a test signal B having a condition B, a test signal C having a condition C, and a test signal D having a condition D. It is recorded several times in order. Based on the reproduced signal obtained by reproducing these recorded signals, it is possible to reduce the influence of the tilt variation in the circumferential direction of the optical disc 101 and the scratches and stains on the disc.
- the initial value indicating the pulse position indicates, for example, condition A.
- the value indicating the condition A may be written in the optical disc 101 in advance, or may be obtained in advance based on the result of the test recording.
- One example in which the initial value of the pulse position is described in advance on the optical disc 101 is a case where a value common to a plurality of optical discs created under the same conditions is described when the optical disc is created. For example, it can be recorded in advance by wobbling a group.
- One example in which the initial value of the pulse position is obtained in advance based on the result of the test recording is a case where the recording parameters optimized for the optical disc 101 in the previous time are recorded in the test area. If both the value written when creating the optical disc 101 and the value of the recording parameter optimized for the previous optical disc 101 are recorded on the optical disc 101, the value of the recording parameter optimized for the previous optical disc 101 is used. It is better to use.
- the recording parameter values optimized for the previous optical disc 101 were determined in consideration of the variations in the quality of the optical disc and the quality of the optical disc drive, and based on this value, the SZN ratio could be secured. Recording can be performed.
- one condition may be recorded in one lap, and one test recording may be one or more laps. Optimization accuracy is improved by increasing the number of samples.
- FIG. 8 is a diagram for explaining a procedure for determining a plurality of conditions for optimizing a pulse position.
- the procedure for determining a plurality of conditions for optimizing the pulse position is executed by at least one of the recording condition determining means 108 and the recording compensation circuit 109.
- Condition A is determined as an initial value indicating the pulse position.
- the value indicating the condition A may be written in the optical disc 101 in advance, or may be obtained in advance based on the result of the test recording.
- the optical disc device 100 controls the optical head 102 to record the data on the optical disc 101! Read the initial value.
- condition B is determined by fixing Ttop and dTtop of condition A and reducing dTe of condition A by a predetermined size ( ⁇ dTe).
- Condition C is determined by increasing Ttop of condition A by a predetermined size ( ⁇ Ttop), increasing dTtop of condition A by a predetermined size ( ⁇ dTtop), and fixing dTe of condition A.
- Ttop of condition A is increased by a predetermined size ( ⁇ Ttop)
- dTtop of condition A is increased by a predetermined size ( ⁇ dTtop)
- dTe of condition A is increased by a predetermined size ( ⁇ dTe).
- condition D is determined.
- the pulse position changing step (for example, ATtop, ⁇ dTtop, ⁇ dTe) is desirably about 1% to 7% of the window width.
- Condition a is determined as an initial value indicating the pulse position.
- the value indicating the condition a may be written in the optical disk 101 in advance, or may be obtained in advance based on the result of the test recording.
- the condition b is determined by fixing Ttop and dTtop of the condition a and increasing the dTe of the condition a by a predetermined size ( ⁇ dTe).
- the Ttop of the condition a is increased by a predetermined size ( ⁇ Ttop)
- the dTtop of the condition a is increased by a predetermined size ( ⁇ dTtop)
- the d of the condition a is further increased.
- condition c is determined.
- Ttop of condition a is increased by a predetermined size (ATto P)
- dTtop of condition a is increased by a predetermined size ( ⁇ dTtop)
- dTe of condition a is increased by a predetermined size ( ⁇ dTe).
- the condition d is determined by increasing the value of
- condition b ' is determined by fixing Ttop and dTtop of the condition a and reducing dTe of the condition a by a predetermined size ( ⁇ dTe).
- Ttop of condition a is reduced by a predetermined size (ATtop)
- dTtop of condition a is reduced by a predetermined size ( ⁇ dTtop)
- dTe of condition a is reduced by a predetermined size ( ⁇ dTe).
- the condition d ' is determined by reducing the value by as much as possible.
- the pulse position changing step (for example, ATtop, ⁇ dTtop, ⁇ dTe) is desirably about 1% to 7% of the window width.
- the parameters indicating the pulse position of 2T are set in condition a, condition b, condition c, and condition d (see Fig. 8 (b)), and the test signal indicating these conditions is recorded and reproduced.
- the condition where M is the smallest is provisionally determined.
- the parameters indicating the pulse position of 2T are set in condition a, condition b ', condition c', and condition d '(see Fig. 8 (b)), and the test signal indicating these conditions is recorded and reproduced.
- the condition where the index M is the smallest is provisionally determined. Of the two provisionally determined conditions, the one with the smaller index M is determined as the condition indicating the 2T pulse position.
- the pulse position of the mark other than the 3T mark is not changed, and similarly, when changing the pulse position of the 2T mark, the pulse position of the mark other than the 2T mark is not changed.
- the data to be recorded may be a random pattern or may be fixed to a specific pattern.
- the step of changing the pulse position is desirably about 1% to 7% of the window width.
- One method for reducing the index M is to correctly identify the 2T mark and the 3T mark, and as in the present embodiment, the pulse of either one or both of the 2T mark and the 3T mark is used. By optimizing the position, recording can be performed more correctly.
- the optimum pulse position of the 3T mark is determined once by performing test recording and reproduction under four conditions, and the seven conditions are divided into two times to perform test recording and reproduction.
- the procedure for determining the optimal pulse position of the 2T mark is not limited to this.
- the force determination procedure for simultaneously determining Ttop and dTtop is not limited to this.
- the 3T mark is recorded by pulse positions corresponding to the four conditions, but all three conditions except the initial condition are conditions under which the 3T mark is recorded long. is there. In order to identify 2T marks with high frequency of appearance more reliably, there is a high probability that the optimum conditions will be found under conditions where the 3T marks are long.
- the 2T signal is recorded by the pulse positions corresponding to the seven conditions.
- the 2T signal has a large change in the SZN ratio due to variations between the optical disk and the optical disk device. Do not search only. Note that, in FIG. 8B, the upper right condition and the lower left condition have a risk that the mark length is greatly changed as compared with the initial state, and therefore, no search is performed in the present embodiment.
- the pulse determination conditions for recording the 2T mark and the 3T mark in the present embodiment are such that the initial conditions are determined in the same procedure as in the present embodiment, or are described in the conventional example. This is effective when the jitter is determined by a procedure that reduces the jitter similarly to the procedure. If there is no basis that the initial condition and the optimum condition are close to each other, a pulse determining condition different from that of the present embodiment may be used.
- the laser drive circuit 112 causes the optical head 102 to transmit the test signal recorded on the optical disc 101.
- the optical head 102 is controlled so as to reproduce A, test signal B, test signal C, and test signal D.
- the reproduced signal 103 generated by reproducing the test signal A, the test signal B, the test signal C, and the test signal D is input to the reproducing means 104.
- the reproduction signal 103 changes according to the presence or absence of a recording mark formed on the optical disc 101.
- FIG. 9 shows a configuration of the reproducing means 104.
- the reproducing means 104 includes a preamplifier 201, a high-pass filter 202, an AGC circuit 203, a waveform equalizer 204, an AZD translator 205, a shaping section 206, a maximum likelihood decoder 207, and a reliability calculating section 208.
- the shaping unit 206 is, for example, a digital filter, and a digital filter generated by the AZD converter 205. Receiving the digital signal and shaping the waveform of the digital signal so that the digital signal has a predetermined equalization characteristic.
- the maximum likelihood decoder 207 is, for example, a Viterbi decoding circuit, performs maximum likelihood decoding on a digital signal whose waveform is output from the shaping unit 206, and generates a binary signal indicating a result of the maximum likelihood decoding. .
- the reliability calculation unit 208 is, for example, a difference metric analyzer, and is based on the digital signal whose waveform is output from the shaping unit 206 and the binary signal output from the maximum likelihood decoder 207. Calculate the reliability of the result of maximum likelihood decoding.
- the reliability of the result of maximum likelihood decoding is determined by the difference between the shaped digital signal output from the shaping unit 206 and the binarized signal output from the maximum likelihood decoder 207 or the output from the shaping unit 206. This is indicated by the difference between the digital signal whose waveform has been shaped and the signal generated based on the binary signal output from the maximum likelihood decoder 207.
- Preamplifier 201 amplifies signal 103.
- the amplified signal 103 is AC-coupled by the high-pass filter 202 and then input to the AGC 203.
- AGC 203 adjusts the gain so that the output of waveform equalizer 204 has a constant amplitude.
- the reproduced signal output from AGC 203 is shaped by waveform equalizer 204.
- the waveform-shaped reproduced signal is input to AZD Transform 205.
- AZD translator 205 samples the reproduced signal at clock 209.
- the clock 209 is generated based on the reproduced signal by a PLL (not shown).
- the reproduction signal generated by sampling the AZD transformer 205 is input to the shaping unit 206.
- the shaping section 206 adjusts the frequency characteristic of the reproduced signal during recording and reproduction to the characteristic assumed by the maximum likelihood decoder 207 (in this embodiment, the PR (1, 2, 2, 1) equalization characteristic). Adjust the frequency of the playback signal (ie, shape the waveform of the playback signal).
- Maximum likelihood decoder 207 performs maximum likelihood decoding on the waveform-shaped reproduced signal output from shaping section 206, and generates a binary signal.
- the reliability calculation unit 208 receives the waveform-shaped reproduced signal output from the shaping unit 206 and the binarized signal. The reliability calculation unit 208 determines a state transition from the binary signal.
- the reliability calculation unit 208 calculates an index M (see (Equation 6)) indicating the reliability of the decoding result based on V based on the determination result and the data 210.
- the reliability calculator 208 calculates an index M based on the reproduced signals corresponding to the plurality of test signals A, and further calculates Calculate the average of multiple indicators M issued. Further, the reliability calculator 208 calculates the average of the index M for each of the plurality of test signals B, the plurality of test signals C, and the plurality of test signals D, as in the case of the plurality of test signals A. Is calculated.
- the output result 107 is sent to the recording condition determining means 108.
- Output 107 contains these averages.
- the recording condition determining means 108 selects (determines) the condition corresponding to the smallest value from the plurality of average values included in the output result 107 as the pulse position condition of the 3T mark. If a plurality of average values are equal to or similar to each other, the value can be determined according to a priority assigned in advance. For example, an average of a plurality of indices based on a plurality of test signals C may be prioritized over an average of a plurality of indices based on a plurality of test signals D. The average of multiple indicators based on multiple test signals B may take precedence over the average of multiple indicators based on multiple test signals C. An average of a plurality of indices based on a plurality of test signals A may be prioritized over an average of a plurality of indices based on a plurality of test signals B.
- test signals A, test signals B, test signals C, and test signals D is not limited to a plurality. If there is not more than one test signal A, test signal B, test signal C and test signal D, there is no need to calculate the average of the indicators based on each test signal.
- a plurality of test signals are subjected to maximum likelihood decoding, a plurality of binary signals indicating the result of the maximum likelihood decoding are generated, and a plurality of test signals and a plurality of binary signal signals are output by reliability calculating section 208.
- the form in which the index M indicating the reliability of the decoding result is calculated has been described, but the calculation of the index indicating the reliability is not limited to this form. For example, when signals indicating a plurality of paths generated by the maximum likelihood decoder 207 based on the test signal are input to the reliability calculation unit 208, the reliability calculation unit 208 Based on the path, a plurality of indicators indicating the reliability of the test signal are calculated.
- the reliability calculation unit 208 calculates the difference between the test signal and the path A and the difference between the test signal and the path B.
- the reliability calculation unit 208 calculates an index indicating the reliability of the test signal with reference to these differences.
- the recording condition determining means 408 can select one recording condition from the plurality of recording conditions based on the plurality of indices indicating the reliability of the plurality of test signals.
- the parameter indicating the pulse position of the 3T mark has been optimally determined. According to these parameters, the relative positions of a plurality of light pulses included in the light are determined, and by irradiating the light to the optical disk 101, an optimal 3 ⁇ mark can be formed on the optical disk 101.
- the optimization of the parameter indicating the pulse position of the 2 ⁇ mark is performed in the same manner as the optimization of the parameter indicating the pulse position of the 3 ⁇ mark.
- test recording of test signal a, test signal b, test signal c, test signal d, test signal b ', test signal c', and test signal d 'indicating the pulse position of the 2 ⁇ mark is completed, the laser driving circuit The path 112 controls the optical head 102 so that the optical head 102 reproduces these test signals recorded on the optical disk 101.
- a reproduced signal 103 generated by reproducing these test signals is input to reproducing means 104.
- the reproduction signal 103 changes according to the presence or absence of a recording mark formed on the optical disc 101.
- the reliability calculation unit 208 calculates the index M based on the reproduced signals corresponding to the plurality of test signals a, and further calculates the average of the plurality of calculated indexes M. Further, the reliability calculation unit 208 calculates the average of the index M for each of the plurality of test signals b, the plurality of test signals c, and the plurality of test signals d, as in the case of the plurality of test signals a. Is calculated.
- the output result 107 is sent to the recording condition determining means 108.
- Output 107 contains these averages.
- the recording condition determining means 108 performs the first temporary determination using the condition corresponding to the smallest value among the plurality of average values included in the output result 107 as the pulse position condition of the 2T mark.
- the reliability calculation unit 208 performs the reliability calculation unit 208 for each of the plurality of test signals a, the plurality of test signals b ', the plurality of test signals c', and the plurality of test signals d ' Calculate the average of the index M.
- the output result 107 is sent to the recording condition determining means 108.
- Output 107 contains these averages.
- the recording condition determining means 108 performs the second temporary determination using the condition corresponding to the smallest value among the plurality of average values included in the output result 107 as the pulse position condition of the 2T mark.
- the recording condition determining means 108 determines the condition corresponding to the smallest value of the condition determined in the first temporary determination and the condition determined in the second temporary determination as the pulse position condition of the 2T mark. To be determined.
- the respective indexes are normalized. Then, the condition corresponding to the smallest value is determined as the T mark pulse position condition. For example, based on index M based on test signal a calculated for the first tentative decision, based on index based on multiple test signals b, index based on multiple test signals c, and based on multiple test signals d Normalize the indicator.
- the index based on the multiple test signals b ', the index based on the multiple test signals c' and the multiple test signals d ' Normalize the index based on. Note that when recording for determining the 2T pulse position condition is performed, the immediately preceding 3T pulse position determination condition is reflected.
- the value may be determined according to a priority order assigned in advance. For example, an average of a plurality of indices based on a plurality of test signals c may be given priority over an average of a plurality of indices based on a plurality of test signals d. The average of multiple indicators based on multiple test signals b may be given priority over the average of multiple indicators based on multiple test signals c. An average of a plurality of indices based on a plurality of test signals a may be given priority over an average of a plurality of indices based on a plurality of test signals b.
- an average of a plurality of indices based on a plurality of test signals c ' may be prioritized over an average of a plurality of indices based on a plurality of test signals d'.
- An average of a plurality of indices based on a plurality of test signals b ' may be prioritized over an average of a plurality of indices based on a plurality of test signals c'.
- An average of a plurality of indices based on a plurality of test signals a may be prioritized over an average of a plurality of indices based on a plurality of test signals b '.
- the priority order may be multiple test signals a, multiple test signals b ', multiple test signals b, multiple test signals d', multiple test signals c ', multiple test signals d, multiple test signals Signal c or multiple test signals a, multiple test signals b, multiple test signals b ', multiple test signals Signal d, the plurality of test signals c, the plurality of test signals d ', and the plurality of test signals c'.
- test signal a test signal b, test signal c, test signal d, test signal b ', test signal c', and test signal d 'is not limited to plural. If each of these test signals is not plural, it is not necessary to calculate the average of the index based on each test signal.
- the parameter indicating the pulse position of the 2T mark has been optimally determined. According to these parameters, the relative positions of a plurality of light pulses included in the light are determined, and by irradiating the light to the optical disc 101, an optimal 2T mark can be formed on the optical disc 101.
- dTe generally has smaller fluctuations in the recording mark shape with respect to a change of one step than Ttop and dTto.
- the initial condition when the initial condition is determined to be equal to or less than a predetermined jitter, by setting a priority order as in the present embodiment, it is possible to improve both the jitter and the index M.
- the pulse position can be determined.
- the clock 209 is output from the PLL, and jitter is an indicator of the stable operation of the PLL. Can be.
- the priority order is set as in the present embodiment.
- the pulse position can be determined such that the edge shift is small and the index M is good.
- the initial condition can be determined based on at least one of the edge shift amount and the jitter.
- the test recording is performed before the recording of the user data, and the recording of the user data is performed under the condition that the index M becomes small, so that the shortest time is obtained. If the mark length is short, even if it is positive U, recording can be performed. [0143] In determining the condition for optimizing the pulse position of the 2T mark and the condition for optimizing the pulse position of the 3T mark, only the pulse position different from the initial condition by one step is used. No search is performed, and the movement of the noise position is restricted.
- a pulse position with small jitter degradation and a good index ⁇ can be obtained. Can be determined. Further, by repeating the search step, a pulse position different by two or more steps may be searched. In this case, the pulse position determined in one step may be used as the initial value in the next step! /.
- the initial condition is determined by the circuit configuration as shown in FIG. 11 to be a recording condition such that the output signal of the edge interval measuring circuit 1108 is reduced
- the priority as in the present embodiment is set.
- parameters indicating recording power may be determined by test recording.
- the magnitude of the index ⁇ that is, the eight patterns (see (Equation 4)
- the force is also calculated
- the standard deviation ⁇ is calculated.
- the recording may be performed again by increasing the falling position of the trailing edge of the 2T mark or by delaying the falling position of the trailing edge of the 3T mark, and the smaller standard deviation may be determined.
- the combination of mark and space If the position of the mark can be determined, the trailing edge of the trailing edge of the 2T mark in the 2T mark, 3T space and the following combination is increased, or the trailing edge of the 3T mark in the combination of the 3T mark and the 2T space By slowing down the falling position, the recording is performed again, and the standard deviation may be determined to be smaller. As a result, the edge position can be optimized with higher accuracy.
- the recording may be performed again by increasing the rising position of the leading edge of the 3T mark or by decreasing the rising position of the leading edge of the 2T mark, and the standard deviation may be determined to be smaller.
- the edge position can be determined by the combination of the mark and the space, the space of 3T or more, the rising position of the starting edge of the 3T mark in the combination of 3T marks, or the 4T or more
- the standard deviation force may be determined by delaying the rising position of the leading edge of the 2T mark in the combination of the space and the 2T mark.
- the force that determines the optimum pulse position for the 3T mark and the 2T mark may be determined only for the 2T mark. Since the 2T mark has the highest frequency of appearance, optimizing the pulse position of the 2T mark can achieve more accurate recording than before and shorten the time required to determine the optimum pulse position.
- the optimal pulse positions of the 3T mark and the 2T mark are determined, but the pulse position of the 4T mark can be optimized. By determining the optimal pulse position of the 4T mark, more accurate recording can be performed. Similarly, if there is enough time to determine the optimum pulse position, the optimum pulse positions of all marks can be determined.
- PR (1, 2, 2, 1) equalization is performed using a code having a minimum polarity reversal interval of 2 as a recording code. It is not limited to this.
- the minimum polarity reversal interval is 2 such as a (1, 7) modulation code for a recording code
- the above-described embodiment can be applied, and the minimum polarity inversion such as an 8-16 modulation code used for DVD is used.
- the present invention can be implemented by using a state transition rule. Therefore, when using the state transition rule determined by the recording code that is the minimum polarity reversal interval force ⁇ and the equalization method PR (CO, CI, CI, CO), or the recording code that has the minimum polarity reversal interval of 2 or 3 And the equalization method PR (CO, CI, C2, CI). , CO) can be applied even when the state transition rule defined by CO, Cl, C2 are any positive numbers.
- optical disc device 100 The configuration and operation of the optical disc device 100 according to the embodiment of the present invention have been described above.
- the optical disk device 100 corresponds to “a recording device that records information on a recording medium under one of a plurality of recording conditions”.
- the laser driving circuit 112 corresponds to “first recording means for recording a plurality of test information on a recording medium under a plurality of recording conditions”
- the reproduction means 104 corresponds to “a second recording means for recording information on a recording medium under one of a plurality of recording conditions”
- the reliability calculation unit 208 includes “a plurality of recording conditions recorded on a recording medium”.
- the recording condition determination means 108 corresponds to a ⁇ calculation unit that calculates a difference between each of the plurality of test signals obtained by reproducing the test information of , One of multiple recording conditions Corresponding to the selected part "to select.
- optical disk device 100 of the present invention is not limited to those shown in FIGS. 4 and 9. As long as the function of each means described above is achieved, a device having any configuration can be included in the scope of the present invention.
- the discrepancies between a plurality of test signals obtained by reproducing a plurality of test information recorded on a recording medium by the optical disc device 100 and a desired signal indicating a desired pattern can be referred to.
- the deviation is not limited to being represented by the index M.
- the difference between the test signal waveform pattern and the pre-estimated pattern can be determined, and the recording condition can be selected based on the determination result.
- the patterns estimated in advance are not limited to two patterns. If there is at least one pattern estimated in advance, one of a plurality of recording conditions can be selected by calculating a difference between at least one pattern and a test signal.
- the pattern estimated in advance is not limited to a pattern indicating a 2T mark or a 2T space.
- the pattern may be an nT mark or an nT space (n is a positive integer).
- the pattern estimated in advance can be a combination of a plurality of patterns.
- the pattern estimated in advance may be a combination of a pattern indicating a 2T mark, a pattern indicating a 2T space, and a pattern indicating a 3T mark.
- the pattern estimated in advance is not limited to being stored in advance in a storage unit provided in the optical disk device.
- the pre-estimated pattern can be generated by the optical disk device after the test signal is reproduced.
- the optical disk device is capable of knowing in advance what shape a pattern having an ideal shape has.
- each means described in the embodiment shown in FIGS. 4 and 9 may be realized by hardware, may be realized by software, or may be realized by hardware and software. It may be realized. Regardless of whether it is realized by hardware, software, or hardware and software, the optical disc device can record "multiple test information on a recording medium under multiple recording conditions." A step of recording information on a recording medium under one of a plurality of recording conditions, and a step of reproducing a plurality of pieces of test information recorded on the recording medium. Calculating a difference between each of the plurality of test signals and at least one desired signal '' and a step of selecting one of the plurality of recording conditions by referring to the difference.
- the recording processing of the present invention can be executed.
- the recording process of the present invention may have an arbitrary procedure as long as the above-described steps can be executed.
- a recording processing program for executing the function of the optical disk device is stored in the optical disk device of the present invention.
- the recording processing program causes a function of the optical disk device to be executed.
- the recording processing program may be stored in advance in a storage unit included in the optical disk device when the computer is shipped. Alternatively, the recording processing program may be stored in the storage unit after the computer is shipped. For example, a user may download a recording processing program from a specific website on the Internet for a fee or free of charge, and install the downloaded program on a computer. If the recording processing program is recorded on a computer-readable recording medium such as a flexible disk, CD-ROM, DVD-ROM, etc., the access processing is installed in the computer using an input device (for example, a disk drive). I'm going to make it one shot. The installed recording processing program is stored in the storage unit.
- the recording control device (the shaping unit 206, the maximum likelihood decoding unit 207, the reliability calculating unit 208, and the recording condition determining unit 108) is implemented as a one-chip LSI (semiconductor integrated circuit) or a part thereof. Can be manufactured.
- the recording control device is manufactured as a one-chip LSI, the manufacturing process of the optical disk device can be simplified.
- the recording method of the present invention is useful when performing high-density recording on an optical disc.
- the recording device, the program, and the recording control device of the present invention a difference between a plurality of test signals obtained by reproducing a plurality of test information and a desired signal is calculated, and a plurality of recording signals are recorded. Select one of the recording conditions. Therefore, in order to match one recording condition with a desired signal condition, information is recorded on a recording medium under conditions close to the desired signal condition only by selecting one recording condition from a plurality of recording conditions. thing Can do. As a result, the recording parameters can be optimized with a simple circuit configuration.
- test recording is performed before recording user data, and user data is recorded under the condition that the PRML error index M is small. Therefore, even if the shortest mark length is short, it is correct. U, can record.
- test recording is performed before recording of user data, and user data is recorded under a condition where the PRML error index M is small, so that variations in optical disc quality can be achieved. And data that is not affected by variations in the quality of optical disc devices.
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Abstract
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JP2005515198A JPWO2005043537A1 (ja) | 2003-10-31 | 2004-11-01 | 記録方法、記録装置、プログラムおよび記録制御装置 |
EP04799444A EP1679709A1 (en) | 2003-10-31 | 2004-11-01 | Recording method, recording apparatus, program and recording control apparatus |
US10/577,865 US20070121450A1 (en) | 2003-10-31 | 2004-11-01 | Recording method, recording apparatus, program and recording control apparatus |
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US7646686B2 (en) | 2003-11-06 | 2010-01-12 | Panasonic Corporation | Recording/reproduction apparatus which adjusts recording power based on a partial response maximum likelihood (PRML) technique |
CN1734584A (zh) * | 2004-08-13 | 2006-02-15 | 皇家飞利浦电子股份有限公司 | 一种确定用于光盘刻写的参数的方法及装置 |
JP4523470B2 (ja) * | 2005-03-29 | 2010-08-11 | 太陽誘電株式会社 | 光情報記録装置および方法および信号処理回路 |
US20090089680A1 (en) * | 2007-09-27 | 2009-04-02 | John Michael Garrison | Aliasing uniform resource locations within a browser |
JP4940197B2 (ja) * | 2008-07-30 | 2012-05-30 | 株式会社日立製作所 | 信号変換モジュール及びそれを用いた光ディスク装置 |
US8289829B2 (en) * | 2008-10-01 | 2012-10-16 | Panasonic Corporation | Information recording medium and recording/reproduction apparatus |
US8446810B2 (en) * | 2008-10-01 | 2013-05-21 | Panasonic Corporation | Information recording medium having recording condition for adjusting the position of cooling pulse |
US20100080095A1 (en) * | 2008-10-01 | 2010-04-01 | Panasonic Corporation | Recording control method, recording/reproduction method, recording control apparatus and recording/reproduction apparatus |
JP2010212929A (ja) * | 2009-03-10 | 2010-09-24 | Sony Corp | 測定装置、再生装置、測定方法 |
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JP3615182B2 (ja) * | 2001-11-26 | 2005-01-26 | 株式会社東芝 | 光近接効果補正方法及び光近接効果補正システム |
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2004
- 2004-11-01 WO PCT/JP2004/016238 patent/WO2005043537A1/ja active Application Filing
- 2004-11-01 JP JP2005515198A patent/JPWO2005043537A1/ja not_active Withdrawn
- 2004-11-01 EP EP04799444A patent/EP1679709A1/en not_active Withdrawn
- 2004-11-01 CN CNA2004800395744A patent/CN1902702A/zh active Pending
- 2004-11-01 US US10/577,865 patent/US20070121450A1/en not_active Abandoned
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JP2002269744A (ja) * | 2001-03-15 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 光ディスク記録装置におけるレーザ光のパルス幅調整装置、及びパルス幅調整方法 |
WO2002089123A1 (fr) * | 2001-04-27 | 2002-11-07 | Matsushita Electric Industrial Co., Ltd. | Disque optique enregistrable, appareil d'enregistrement de disque optique, appareil de reproduction de disque optique et procede d'enregistrement de donnees sur disque optique enregistrable |
JP2003141823A (ja) * | 2001-07-19 | 2003-05-16 | Matsushita Electric Ind Co Ltd | 再生信号品質評価方法および情報再生装置 |
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US20070121450A1 (en) | 2007-05-31 |
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KR100852614B1 (ko) | 2008-08-18 |
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