WO2006112342A1 - ウォブル信号の信号処理方法、光ディスクの記録及び再生方法、光ディスク装置、プログラム、及び記録媒体 - Google Patents
ウォブル信号の信号処理方法、光ディスクの記録及び再生方法、光ディスク装置、プログラム、及び記録媒体 Download PDFInfo
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- WO2006112342A1 WO2006112342A1 PCT/JP2006/307806 JP2006307806W WO2006112342A1 WO 2006112342 A1 WO2006112342 A1 WO 2006112342A1 JP 2006307806 W JP2006307806 W JP 2006307806W WO 2006112342 A1 WO2006112342 A1 WO 2006112342A1
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- component
- crosstalk
- wobble
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions
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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
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—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
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
Definitions
- the present invention relates to an optical disc in which tracks for recording information in a spiral shape are formed.
- a wobble signal signal processing method used for recording an information pattern at a predetermined position on the track, or reproducing an information pattern recorded at a predetermined position on the track, and recording and reproduction of an optical disc.
- the present invention relates to a method, an optical disc apparatus, a program, and a recording medium.
- a spiral group is engraved on the recording surface of the disc as a track for recording information patterns.
- this groove is formed so as to meander slightly according to a carrier signal consisting of a sine wave.
- the position is controlled so that the light beam emitted from the optical head is condensed on the group corresponding to the recording track.
- the rotational speed of the optical disk is controlled so that the linear velocity at which the light beam scans the recording track is constant. In order to perform this rotation control easily, a carrier signal that reproduces the meandering force of the track is used.
- the linear velocity can be kept constant by controlling the rotation speed so that the frequency of the reproduced carrier signal is constant.
- the information pattern recorded in synchronization with the recording clock kept at a constant frequency is formed on the group as a pattern having a constant linear density.
- a DVD-R disc in addition to meandering of a digital information power group including address information, it is represented by prepits provided as an emboss pattern between groups.
- the pre-pit information is decoded to control the recording start position.
- Address information indicating the position on the disc is expressed using prepits such as DVD-R.
- DVD + R uses a signal that represents digital information including addresses by inserting a sine wave whose phase is 180 ° locally different from the carrier signal into a carrier signal that also has a sinusoidal force as a wobble signal, and causes the group to meander according to this signal. ing.
- Address information can be obtained by demodulating the recovered wobble signal.
- the light beam emitted from the optical head 2 is collected on the optical disc 1, and the reflected light is received by a photodetector (not shown) divided into two along the circle.
- a signal that changes according to the meandering of the groove is obtained by calculating the difference in the current output obtained by each detector force by the regenerative amplifier 3.
- the optical beam collected on the optical disc 1 is not only the target group, but a part of it is also applied to the adjacent group.
- FIG. 14 conceptually shows a group on the optical disc and a light beam condensed on the group.
- the light beam 201 emitted from the optical head 2 is focused on the optical disc 1, and most of the components are concentrated inside the circle shown by the dotted line, but some of the components are also distributed outside the circle. To do. For this reason, a part of the reflected light includes light that hits the periphery of the circle.
- the original wobble signal obtained from the regenerative amplifier 3 is a signal mixed with crosstalk components and noise corresponding to meandering of adjacent groups.
- this crosstalk noise was treated as a disturbance, and a wobble clock synchronized with the original wobble signal was obtained by the wobble clock extraction circuit 6 based on the output of the regenerative amplifier.
- the wobble clock extraction circuit 6 a circuit having high frequency stability by absorbing phase fluctuation due to noise, such as a PLL (Phase Locked Loop) synchronous circuit, is used.
- the address information is extracted from the original wobble signal and the wobble clock using the wobble signal demodulation circuit 5.
- the wobble signal demodulator circuit 5 has, for example, a pass band in the vicinity of the wobble frequency, a band pass filter 501 that removes noise components outside the band from the original wobble signal force, and a sampling that samples the output of the band pass filter in synchronization with the wobble clock.
- a synchronization circuit 503 that synchronizes the outputs of the circuit 502 and the sampling circuit 502 with a binary value, and an address decoder 50 that extracts the address information by decoding the output of the synchronization circuit 503 Consists of four.
- the scanning speed of the light beam is substantially constant.
- the linear velocity is maintained.
- the disk system control circuit 10 generates a recording pattern in synchronization with a recording clock maintained at a constant frequency based on the address information obtained from the wobble signal demodulation circuit 5, and passes the recording control circuit 11. Then, by modulating the light beam intensity, an information pattern can be formed on the optical disc 1 with a constant linear density.
- the disk system control circuit 10 uses the current output of the photodetector output from the optical head 2 through the reproduction control circuit 16 based on the address information obtained from the wobble signal demodulation circuit 5 to output from the optical disk 1. The total reflected light amount is detected and the information pattern on the optical disc 1 is read.
- a clock synchronized with a wobble clock may be generated and used by a multiplier circuit.
- a fixed-frequency oscillator has excellent frequency stability, but does not follow the fluctuations in linear velocity caused by the eccentricity of the optical disk. For this reason, it is difficult to keep the accuracy of the information pattern formation position below the amount of phase fluctuation accompanying eccentricity.
- the recording clock is generated by multiplying the wobble clock, the information pattern can be recorded following the linear velocity detected by the wobble frequency force, so that high positioning accuracy can be obtained.
- Patent Document 1 exemplifies a demodulator for performing address reproduction stably even when a wobble signal is deformed due to a crosstalk component or the like.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-134009 (paragraph numbers [0034] and [0035], FIG. 8)
- the wobble clock extraction circuit uses the original wobble signal including crosstalk to extract the carrier signal, and the carrier signal itself has a phase shift due to crosstalk. Will appear. Since the illustrated apparatus cannot compensate for the phase shift that appears in the carrier signal, it is difficult to ensure positioning accuracy with the extracted carrier signal. Also, here is a method of correcting the distortion generated at the output of the synchronous detection circuit composed of multipliers due to the phase shift, by determining the pattern based on the sequence of the integrated values for each fixed section. This is difficult to avoid a determination error when the crosstalk is large. It is difficult to obtain address information stably.
- the wobble signal processing method, the optical disk recording and reproducing method, the optical disk device, the program, and the recording medium according to the present invention employ the following characteristic configurations. is doing.
- a track for recording information in a spiral shape is formed, and this carrier signal is converted into an approximately sinusoidal carrier signal having a predetermined frequency.
- a light beam is irradiated onto the track, and an original wobble signal including a component corresponding to the meandering of the track and a crosstalk component resulting from the meandering of an adjacent track is generated from the reflected light, and based on the original wobble signal.
- a signal processing method of a wobble signal used for detecting address information and timing and recording an information pattern on the track or reproducing an information pattern on the track,
- the track is generated in a meandering region based on the amplitude and phase of the original wobble signal generated in a region meandering according to the carrier signal and the inserted signal. Estimating the amplitude and phase of the crosstalk component mixed from the adjacent track car based on the amplitude and phase of the original wobble signal;
- the signal processing method for wobble signals according to the present invention also provides an original wobble signal that changes according to the meandering of the group based on the difference in the current output obtained by the photodetector force divided into two in the direction along the group formed on the optical disc. Generating step;
- the wobble clock synchronized with the correction signal. Extracting a carrier component that matches the phase of the wobble clock from the correction signal based on the phase of the wobble clock; and
- the estimated crosstalk component is generated based on the carrier component and the modulation component. And steps
- a track for recording information in a spiral shape is formed, and a signal different from this carrier signal is locally applied to a substantially sinusoidal carrier signal having a predetermined frequency according to a predetermined pattern.
- An information pattern is recorded on the track by using an optical disk formed so that the track meanders in response to a wobble signal modulated to represent digital information including address information by inserting into the track.
- an optical beam is irradiated on the track, and a source including a component corresponding to the meandering of the track and a crosstalk component resulting from meandering of the adjacent track from reflected light.
- An original wobble signal reproducing means for generating a wobble signal, and a crossover estimated based on the original wobble signal.
- a crosstalk estimating means for generating an estimated value of the crosstalk component, a crosstalk correcting means for obtaining a reproduction wobble signal by subtracting the estimated value of the original wobble signal power, and a reproduction wobble signal with the crosstalk component corrected
- a wobble signal demodulating means for detecting digital information including the address information, and an information pattern is recorded on the track based on the address information and timing detected by the wobble signal demodulating means. Alternatively, the information pattern on the track is reproduced.
- the optical disc apparatus of the present invention generates an original wobble signal that changes in accordance with the meandering of the group based on a difference in current output that can also obtain a photodetector force divided in two along a group formed on the optical disc.
- a crosstalk correction circuit that outputs a correction signal in which the crosstalk component is reduced based on the output including the crosstalk of the regenerative amplifier and the estimated crosstalk component of the estimated adjacent track force, and the like.
- a modulation component extraction circuit that extracts an output force modulation component of the crosstalk correction circuit based on the phase of the wobble clock
- a crosstalk estimation circuit that outputs the estimated crosstalk based on outputs of the carrier component extraction circuit and the modulation component extraction circuit power
- a wobble signal demodulation circuit that demodulates the wobble signal from the crosstalk correction circuit and outputs an address signal
- the program and information recording medium of the present invention are a program for causing a computer to execute the signal processing method for a wobble signal of the present invention, and an information recording medium storing the program.
- the recording method and reproducing method of the present invention use the wobble signal processing method of the present invention.
- an optical disc recording or reproducing method capable of stably reproducing an address even with an original wobble signal force in which crosstalk or noise is mixed with the wobble signal and having high positioning accuracy.
- a medium is obtained.
- FIG. 1 is a block diagram of an optical disc apparatus as a recording apparatus according to a first embodiment of the present invention.
- FIG. 2 is a diagram illustrating operation waveforms of the recording apparatus according to the present invention, and is a diagram for explaining an original wobble signal including crosstalk obtained from a reproduction amplifier.
- FIG. 3 is a diagram illustrating a configuration example of a modulation component extraction circuit.
- FIG. 4 is a diagram showing operation waveforms of the modulation component extraction circuit shown in FIG. 3.
- FIG.5 Example of the operation waveform of the modulation component extraction circuit when Q is set to a value of 2 or more when the meandering polarity inversion part is recorded using MSK modulation in which one period of the carrier signal is recorded FIG.
- FIG. 6 is a diagram showing a second configuration example of a modulation component extraction circuit.
- FIG. 7 is a diagram showing operation waveforms of the modulation component extraction circuit shown in FIG. [Fig. 8] This is a diagram showing the operation waveform when there is a modulation part on the adjacent track and the meandering polarity is reversed.
- FIG. 9 is a block diagram of an optical disc device as a recording device according to a second embodiment of the present invention.
- FIG. 10 is a diagram showing operation waveforms of the recording apparatus shown in FIG.
- FIG. 11 is a block diagram of an optical disc apparatus as a recording apparatus according to a third embodiment of the present invention.
- FIG. 12 is a block diagram of an optical disc device as a playback device according to a fourth embodiment of the present invention.
- FIG. 13 is a block diagram of a conventional optical disc apparatus.
- FIG. 14 is a diagram conceptually showing a group on an optical disk and a light beam condensed on the group.
- FIG. 15 is a block diagram illustrating a configuration example of a computer.
- FIG. 1 shows a block diagram of an optical disc apparatus according to the first embodiment of the present invention.
- This embodiment differs from the optical disk apparatus shown in FIG. 13 in that a crosstalk correction circuit 4, a carrier component extraction circuit 7, a modulation component extraction circuit 8, and a crosstalk estimation circuit 9 are provided, and a reproduction control circuit 16 is provided. It is deleted and it constitutes a recording device.
- a recording / reproducing apparatus may be configured by providing the reproduction control circuit 16.
- the crosstalk correction circuit 4, the carrier component extraction circuit 7, the modulation component extraction circuit 8, the crosstalk estimation circuit 9, and the wobble signal demodulation circuit 5 constitute a wobble signal processing system.
- a difference in current output is obtained by obtaining a photodetector force (not shown) that is divided into two in the direction along the groove provided in the optical head 2.
- a signal that changes according to the meandering of the group is obtained.
- the obtained original wobble signal includes crosstalk due to the meandering of the adjacent group, so that the signal corresponding to the meandering of the target group is subject to phase shift and amplitude fluctuation.
- the signals obtained from the regenerative amplifier 3 are group G2 as indicated by the solid line.
- This signal is obtained by adding the meandering components of groups Gl and G3 to the meandering component of.
- the waveform is shifted in phase and amplitude with respect to the dotted waveform having only the meander component of group G2.
- the amount of phase and amplitude deviation also differs depending on the phase difference between the adjacent track added as crosstalk and the target track. For example, when the phase of an adjacent track is in phase with the target track, the amplitude of the signal obtained from the regenerative amplifier 3 increases, and when the phase is opposite, it decreases.
- the crosstalk from group GO and group G4, which are further outside group G1 and group G3, has a small effect and will not be described.
- the crosstalk correction circuit 4 in Fig. 1 subtracts the crosstalk component from the adjacent track estimated by the crosstalk estimation circuit 9 from the output of the regenerative amplifier 3 including the crosstalk, thereby group G2 indicated by a dotted line. It works to extract the component corresponding to the meandering of. The operation of each circuit for estimating the crosstalk component will be described in detail below.
- the estimated crosstalk output from the crosstalk estimation circuit 9 starts operating with a signal having an amplitude of 0 as an initial value.
- the crosstalk correction circuit 4 outputs a signal corrected by subtracting the estimated crosstalk from the signal including the crosstalk obtained from the regenerative amplifier 3. In the initial state, the output of the crosstalk correction circuit 4 is the same as the output of the regenerative amplifier 3.
- the double clock extraction circuit 6 uses the output of the crosstalk correction circuit 4 to generate and output a timing synchronized with this phase.
- a bandpass filter and a phase synchronization circuit are used as the wobble clock extraction circuit 6, and the phase of the signal after passing through the bandpass filter is synchronized by the PLL.
- the desired phase-synchronized output can be obtained by simply applying.
- the output of the crosstalk correction circuit 4 still has a deviation in amplitude and phase due to the crosstalk.
- the wobble clock obtained from the Wurburg mouth extraction circuit 6 is also obtained as a signal shifted in phase with respect to the carrier phase corresponding to the meander component of the target group G2.
- the carrier component extraction circuit 7 extracts a component that matches the phase of the wobble clock from the output of the crosstalk correction circuit 4 based on the phase of the wobble clock. If the ratio of the meandering polarity reversal is small, the clock is phased at each point where the phase of the wobble clock is 90 degrees or 270 degrees. By sampling the signal output from the loss talk correction circuit 4 and obtaining the average value of the amplitude, the carrier component can be found almost positively.
- a band pass filter having a pass band in the vicinity of the wobble frequency with respect to the output of the crosstalk correction circuit 4 is provided at the input stage of the carrier component extraction circuit 7, or a sample value having a unique value is excluded.
- the carrier component extraction circuit 7 only needs to output information on how many components are in phase with the wobble clock included in the output of the crosstalk correction circuit 4, the output signal is a value indicating the amplitude of the sine wave. Only need.
- a sinusoidal signal whose phase is synchronized with the wobble clock is shown as a carrier component for convenience of explanation.
- the carrier component estimated in the initial state where the estimated crosstalk is zero is a signal whose phase and amplitude are shifted due to the influence of the crosstalk.
- the modulation component extraction circuit 8 functions to extract the amplitude and phase of the portion where the meandering polarity is inverted from the output of the crosstalk correction circuit 4 based on the phase of the wobble clock.
- the configuration example of the modulation component extraction circuit 8 can be extracted by detecting a portion having a phase close to the opposite phase to the phase of the power wobble clock described later and calculating the average value of the phase and amplitude.
- the signal output here corresponds to the amplitude of the sine wave component in the opposite phase to the wobble clock and the amplitude of the sine wave component orthogonal to the wobble clock.
- Fig. 2 shows the modulation component extracted as a sinusoidal waveform obtained by the sum of the component out of phase and the component orthogonal.
- the phase and amplitude of the crosstalk component mixed in the output of the regenerative amplifier 3 when the light beam is focused on the group G2 depend on the meandering phase of the adjacent group G1 and group G3 and the spread of the light beam. .
- the balance of crosstalk from Group G1 and Group G3 also changes when the focusing position of the light beam deviates from the central force of Group G2.
- the meandering phase of group G2 and the meandering phase of group G1 and group G3 are almost constant over several hundreds of thousands of wobble periods.
- the change in the meandering phase difference between adjacent tracks is very gradual, and the amount of change is usually about 360 ° from one to several laps.
- the balance of crosstalk from group G1 and group G3 is Control the shape of the focused beam, the shape of the group, and the position of the light beam! Since this is determined by the electrical offset of the circuit, a sudden change in this balance usually does not appear.
- the crosstalk components from group G1 and group G3 over several hundred to several thousand wobble periods are both sinusoidal waveforms having a substantially constant phase difference with respect to the meandering phase of group G2. Since the noise is almost constant, the sum component can be ignored as a sinusoidal waveform with a constant phase difference from the carrier signal corresponding to the meandering phase of group G2.
- the crosstalk component force mixed in the output of the regenerative amplifier 3 is approximated by a sinusoidal waveform having a substantially constant phase difference with respect to the group G2 carrier signal. This is used to estimate the crosstalk component.
- the crosstalk estimation circuit 9 is given the estimated value of the carrier component extracted by the carrier component extraction circuit 7 and the estimated value of the modulation component extracted by the modulation component extraction circuit 8.
- the group G2 is meandering with a component that is meandering in phase with the carrier signal and having the polarity reversed.
- the components cancel each other out of phase with each other.
- the remaining components are mixed into the respective regions meandering in the same phase and opposite phase as the carrier signal at a substantially constant phase and become residual components of crosstalk.
- the crosstalk estimation circuit 9 outputs the phase and amplitude of the sine wave output as the estimated crosstalk while sequentially updating it with the residual component of the crosstalk.
- the crosstalk estimation circuit 9 includes a holding circuit (not shown) that holds the phase and amplitude of the sine wave output as estimated crosstalk, and the phase and amplitude of the sine wave are sequentially updated by the residual component of the crosstalk. Retained.
- the update can be performed, for example, by adding a constant ⁇ times the obtained crosstalk residual component to the sine wave output as the estimated crosstalk.
- the estimated crosstalk output from the crosstalk estimation circuit 9 is fed back to the crosstalk correction circuit 4 so that the residual components of the crosstalk contained in the output of the crosstalk correction circuit 4 are gradually reduced. To do.
- the constant ⁇ takes into account the response of the carrier component extraction circuit 7 and the modulation component extraction circuit 8, and the crosstalk correction circuit 4, the carrier component extraction circuit 7, and the modulation component extraction. Set to a value that is small enough to ensure the stability of the closed loop composed of the source circuit 8 and the crosstalk estimation circuit 9, for example, about 1/1000.
- the estimated crosstalk waveform output from the crosstalk estimation circuit 9 converges so as to approach the sum of the crosstalk components included in the output waveform of the regenerative amplifier 3.
- the waveform output from the correction circuit does not include the component corresponding to the meandering of group G1 or group G3, and a signal corresponding to the meandering component of G2 can be obtained.
- the wobble clock is controlled so as to be synchronized with the output of the crosstalk correction circuit 4, the influence of the phase shift due to the crosstalk is canceled, and the signal is synchronized with the carrier component of the group G2.
- the output signal of the carrier component extraction circuit 7 is the meandering component of the group G2, and the phase and amplitude in the same phase as the carrier signal. Shows the amplitude and phase.
- the crosstalk component is also removed from the output force of the crosstalk correction circuit 4.
- the wobble clock extraction circuit 6 can also extract a wobble clock that does not include a phase shift. For this reason, the wobble signal demodulation circuit 5 can perform stable and accurate address decoding without being affected by the crosstalk component.
- the recording position is specified using the address thus extracted, and a recording mark is formed on the optical disk 1 through the recording control circuit 11 and the optical head 2. This makes it possible to always form recording marks with high positional accuracy.
- the amount of phase shift of the wobble clock due to crosstalk varies according to the meandering phase difference between adjacent groups. Although depending on the meandering frequency, the change in meandering phase difference is usually about 360 ° per several revolutions of the normal disk as described above. For this reason, if the crosstalk is not corrected, if the spindle control circuit 12 controls the rotation speed of the spindle motor 13 so that the frequency of the wobble clock is constant, the effect of the phase shift due to crosstalk remains, and the position accuracy Cannot be secured. On the other hand, if the configuration of this embodiment that can extract the V and wobble clocks including the influence of the crosstalk component is used, the influence of the phase shift due to the crosstalk can be eliminated when the spindle control is performed. Position accuracy can be easily secured. Next, a configuration example of the modulation component extraction circuit 8 will be described with reference to FIG. 3 and FIG. 4 showing its operation waveform.
- the modulation component extraction circuit 81 is provided with a wobble clock synchronized with the output signal of the crosstalk correction circuit 4 extracted by the wobble clock extraction circuit 6 along with the waveform output by the crosstalk correction circuit 4.
- Figure 4 shows the waveforms when the crosstalk component remains in the output signal from the crosstalk correction circuit 4.
- the output signal of the crosstalk correction circuit 4 first passes through a bandpass filter 8001 having a passband in the vicinity of the wobble frequency, and then the phase of the wobble clock is 0 °, 90 by the sampling circuit 802. , 180 ° and 270 °.
- the circles in FIG. 4 indicate the sampling points. Since the signal after passing through the bandpass filter contains only components near the wobble frequency, the values sampled at the points where the wobble clock phase is 0 ° and 90 ° are representative of the amplitudes of components orthogonal to each other. It is considered to be shown. As long as the meandering polarity is meandering in phase with the carrier signal, the value sampled when the wobble clock phase is 0 ° is close to 0, and the value sampled at the 90 ° point is the carrier component. It takes a positive constant value corresponding to the amplitude.
- the modulation unit temporary determination circuit 803 based on a pair of values sampled at points where the wobble clock phase is 0 ° and 90 °, the sample value when meandering in the same phase as the carrier signal described above A range in which a value deviating from the above is obtained is extracted as a modulation unit temporary determination range. Further, in order to prevent an estimation error, the modulation component estimation circuit 804 extracts a pair of sample values indicating the values farthest from the phase and amplitude of the carrier signal among the sample values in the tentatively determined range. By averaging the same values obtained within the modulation part tentative determination range using a low-pass filter, it is possible to estimate the in-phase and quadrature components of the modulation component.
- the pass band of the band pass filter 801 provided in the modulation component extraction circuit 81 of FIG. 3 is narrower, the waveform disturbance generated in the filter output due to scratches or defects on the disk can be reduced.
- the frequency of erroneously recognizing the provisional determination range can be reduced.
- a format in which the meandering polarity inversion is always continuous for four or more carrier signals depending on the modulation rule is given by the ratio of the center frequency to the passband width. It is desirable to set the Q (Quality factor) of the bandpass filter 801 to about 4.
- the meandering polarity reversal portion is formed by one period of the carrier signal, or the meandering polarity reversal portion meanders at a frequency 1.5 times as shown in Patent Document 1, for example.
- the Q of the bandpass filter 801 may be set to around 1.
- the phase and amplitude of the meandering polarity inversion portion can be extracted in the same manner as shown in FIG.
- FIG. 5 shows a modulation component extraction circuit when Q is set to a value of 2 or more when the meandering polarity inversion portion is recorded using MSK modulation in which one period of the carrier signal is recorded.
- 81 operation waveform examples are shown.
- Q of the bandpass filter 801 is increased, the output of the filter does not match the phase and amplitude of the inversion part within the time when the input signal of the meandering polarity inversion part is given.
- the output amplitude of the filter decreases.
- the sampling circuit 802 samples this output waveform every 90 ° phase of the wobble clock. Based on the sample values corresponding to the carrier signal phases of 0 ° and 90 °, the modulation unit temporary determination circuit 803 performs a temporary determination of the modulation unit based on whether or not the force is below a certain value.
- the modulation component extraction circuit 804 extracts a pair of sample values indicating the values farthest from the phase and amplitude of the carrier signal from the temporarily determined range of sample values. In both cases, the modulation component is estimated by averaging the same values obtained within the modulation part tentative determination range that appeared in the past.
- the value estimated as the modulation component does not directly represent the amplitude or phase corresponding to the meandering polarity inversion portion in the output of the correction circuit by increasing the Q of the bandpass filter 801.
- the amplitude and phase include the effect of the amplitude and phase of the signal at a fixed ratio.
- the amplitude and phase extracted as the modulation component include 1/3 of the component representing the phase and amplitude of the meandering polarity inversion portion and 2/3 of the component meandering in phase with the carrier signal.
- An example of processing will be shown. This ratio can be processed in the same way even when the force ratio determined by the characteristics of the bandpass filter changes.
- the crosstalk estimation circuit 9 uses the input carrier component C
- the estimated value of the carrier component that is not simply added to the modulation component M is multiplied by 1/3, and this is subtracted from the estimated value of the modulation component.
- the ratio between the in-phase component and the anti-phase component becomes 1: 1 and cancels each other out, and the phase and amplitude proportional to the crosstalk component are mixed in the correction circuit output as residual crosstalk components. Information can be retrieved.
- the crosstalk estimation circuit 9 updates the phase and amplitude of the sine wave that is output as estimated crosstalk based on this residual component, thereby providing feedback so that the residual component of crosstalk gradually decreases. I can make money.
- the internal estimation carrier generation circuit 805 uses the sine wave in phase with the wobble clock as the estimated carrier signal ⁇ 0 and the estimated carrier as the phase shift carrier signal ⁇ 90. A sine wave whose phase is 90 ° ahead of the signal is generated. Each sine wave is input to the in-phase component and quadrature component synchronous detection circuits 806 and 807, and used as a reference for synchronous detection of the crosstalk correction circuit output input to the modulation component extraction circuit. .
- the synchronous detection circuit 806 provided for the in-phase component multiplies both signals from the correction circuit output and the estimated carrier signal ⁇ 0 to generate an in-phase component product waveform. Furthermore, the low-pass In-phase component detection output is obtained by removing the component twice the carrier frequency with the filter. The in-phase component detection output shows almost the same value as the amplitude of the sine wave in phase with the carrier signal except for the meandering polarity inversion part. In addition, the meandering polarity reversal part takes a negative value, and the negative peak value generally coincides with the amplitude of the component opposite in phase to the carrier signal.
- a quadrature component product waveform is similarly generated from the correction circuit output and the phase shift carrier signal ⁇ 90 by multiplication, and the harmonic component is further generated by the low-pass filter.
- the quadrature component detection output is output by removing.
- Modulation component estimation circuit 808 receives the in-phase detection component and the quadrature detection component, and sets the negative peak value of the in-phase detection component as the in-phase component of the meandering polarity reversal part at the same timing as the corresponding quadrature component. Capture quadrature detection components. Furthermore, the modulation component is estimated and output by averaging using a low-pass filter based on the in-phase and quadrature components captured in the past. Figure 7 shows the sine wave obtained by adding the in-phase and quadrature components obtained in this way as the modulation component obtained by estimation. The crosstalk estimation circuit 9 can correctly obtain the crosstalk estimation value for the modulation component force extracted in this way.
- the description in the case where there are modulation portions in the group G1 and the group G3 adjacent to the inside and outside of the group G2 has been omitted.
- the group G1 and the group G3 also have a modulation part like the group G2, and the meandering polarity may be reversed.
- the meandering polarity of the adjacent group G1 or G3 is reversed, the meandering polarity is reversed. The cross talk will be mixed.
- the length of the meandering polarity inversion portion is reversed! / ⁇ , which is sufficiently shorter than the length of the portion.
- the carrier component extraction circuit and the modulation component extraction circuit described so far are configured to extract the carrier component and the modulation component by averaging the sample values obtained by processing the input signal. For this reason, the influence of crosstalk from the meandering polarity inversion portion with low occurrence frequency hardly appears, and the value obtained as the estimated crosstalk substantially matches the crosstalk from the carrier signal component of the adjacent track.
- Fig. 8 shows the operation waveform when the adjacent track has a modulation part and the meandering polarity is reversed. Indicates.
- the output signal of the regenerative amplifier includes a crosstalk component of adjacent track force. Except for the modulation part of the adjacent track, the crosstalk component added to the meandering polarity inversion part and other areas is a sine wave having a constant phase and amplitude with respect to the carrier signal.
- the estimated crosstalk output from the crosstalk estimation circuit is subtracted from the output of the reproduction amplifier, thereby correcting the crosstalk component and demodulating the wobble signal and controlling the spindle motor.
- the estimated crosstalk converges to the crosstalk component excluding the modulation part of the adjacent track. For this reason, the output power of the correction circuit can be obtained with substantially the same amplitude except for the modulation part of the adjacent track.
- the crosstalk component In the modulation portion of the adjacent track, the crosstalk component is not canceled out, so that an amplitude or phase shift appears in the correction circuit output. However, since the period in which the deviation appears is short, it usually does not affect the demodulation characteristics of the wobble signal or the control characteristics of the spindle motor.
- the adjacent modulation section estimation circuit 14 in the figure estimates and outputs the modulation portion of the adjacent track based on the signal output from the regenerative amplifier.
- the modulation part of the adjacent track can be estimated as a range that is in phase with the carrier component and whose difference from the average amplitude is greater than or equal to a predetermined value
- the adjacent modulation unit estimation circuit 14 samples the output of the regenerative amplifier 3 at each of 90 ° and 270 ° with respect to the phase of the estimated carrier signal given by the wobble clock, and has an opposite phase to the estimated carrier signal.
- the sample value is determined based on its polarity, and the expected value of the amplitude in the region in phase with the estimated carrier signal is calculated by taking the moving average of only the sample value in phase with the estimated carrier signal.
- each sample value is compared with the expected value obtained within the same phase as the estimated carrier signal. If the difference exceeds 10%, for example, the sample value is compared. It is estimated that the data point corresponds to the modulation part of the adjacent track. For the meandering polarity inversion part, although the amplitude difference is large, the polarity is almost opposite to that of the carrier component, so it is not determined as the modulation part of the adjacent track.
- the crosstalk estimation circuit 9 Based on the estimated adjacent modulation section signal output from the adjacent modulation section estimation circuit, the crosstalk estimation circuit 9 temporarily replaces the estimated crosstalk output with a signal having an amplitude of 0 in the corresponding region. As a result, the crosstalk component is not corrected for the region estimated as the modulation section of the adjacent track, and the crosstalk correction circuit 4 outputs the same value as the output signal of the regenerative amplifier.
- the influence of the crosstalk is not completely eliminated, and a slight fluctuation in amplitude and phase remains in the output signal of the crosstalk correction circuit.
- the amplitude of the crosstalk component remaining in this area is expected to be approximately the same as the amount of crosstalk of the force other than the modulation area of the adjacent track.
- the amplitude and phase shift are improved compared to the case where the talk is not replaced with a signal with zero amplitude.
- the modulation areas of both adjacent tracks often appear at different positions, the occurrence of amplitude and phase shift can usually be further reduced.
- the adjacent modulation section estimation circuit 14 in FIG. 9 may erroneously determine the modulation section of the adjacent track. If the frequency with which the adjacent track is erroneously determined as the modulation unit is high, the frequency of replacing the estimated crosstalk with amplitude 0 becomes high, and the correction accuracy deteriorates.
- the adjacent modulation section estimation circuit is integrated with the length of the estimated adjacent modulation section every fixed period, and when this reaches a certain value, it is determined that the adjacent track corresponds to the modulation section even if the amplitude condition is satisfied. If equipped with a function, accuracy degradation due to misjudgment can be prevented.
- the region modulated in the opposite phase per 93 periods of the carrier signal is at most 4 periods. Even if both adjacent tracks are taken into account, if the sum of the estimated adjacent modulation units exceeds 8 cycles per 93 wobble clock cycles, the output is paused to protect the modulation units of the adjacent tracks and prevent deterioration of accuracy.
- FIG. 11 shows a configuration diagram when a clock synchronized with the wobble clock is generated and used by the recording clock generation circuit 15.
- the recording channel is generated by the phase synchronization circuit based on the wobble clock output from the wobble clock extraction circuit 6.
- a recording clock multiplied by the frequency is generated.
- This recording clock is sent to the disk system control circuit 10 and used as a clock for managing the timing of sending recording channel data in place of the fixed frequency clock. Since the phase shift of the wobble clock is corrected with high accuracy by correcting the crosstalk component, positioning of the information pattern to be recorded on the optical disk can be performed by using the recording clock obtained by multiplying this. It can be done with high accuracy.
- the crosstalk correction functions effectively even when applied to a device for reproducing an information pattern recorded on an optical disc.
- Fig. 12 shows the configuration when applied to an optical disk playback device.
- the present invention can also be applied to a recording / reproducing apparatus capable of recording and reproducing an optical disc as shown in FIG.
- the signal power that has passed through the crosstalk correction circuit 4 is also output after the crosstalk components from the adjacent tracks are canceled out, so the address detection accuracy by the wobble signal demodulation circuit 5 is improved. This effect is more pronounced on discs with narrow track spacing and large crosstalk components, and on discs with many scratches and dirt. Also, address recognition errors can be reduced when playback is performed at high speed.
- the reproduction control circuit 16 detects the total amount of light reflected from the optical disk by the current output of the photodetector output from the optical head 2 and reads the information pattern on the disk. In a reproducing apparatus having such a configuration, there are few errors in the address information given to the disk system control circuit 10, so that data recorded at the target address can be read quickly.
- the format has a region in which the meandering phase of the track is inverted with respect to the carrier signal inside the modulation unit, and the region in which the phase is substantially the same as that of the carrier signal.
- the crosstalk component is estimated, but these meanders are also applied to a format in which the modulation unit is modulated to have meandering phases of 120 ° and 240 ° with respect to the carrier signal.
- the modulation unit is modulated so that it is in phase with the carrier signal and only the meandering amplitude is halved, so that the format and frequency of the modulation unit have a frequency twice that of the carrier signal.
- the crosstalk component is similarly extracted by extracting the phase and amplitude specific to the non-modulation part and modulation part for the frequency component near the carrier signal. Can be estimated.
- the wobble signal processing of the optical disc apparatus described above can be realized by causing a computer to execute a program. Accordingly, the present invention also relates to a program, a program product, and a computer-usable recording medium that records the program.
- FIG. 15 shows a configuration in which the functions of the crosstalk correction circuit 4, the carrier component extraction circuit 7, the modulation component extraction circuit 8, the crosstalk estimation circuit 9, and the wobble signal demodulation circuit 5 are executed in a computer configuration.
- a DSP (Digital Signal Processor) 1001 and ROM 1002 serving as an arithmetic processing unit constitute a computer, and a semiconductor memory such as ROM 1002 has a crosstalk correction circuit 4, a carrier component extraction circuit 7, A program that describes the functions of the modulation component extraction circuit 8, the crosstalk estimation circuit 9, and the wobble signal demodulation circuit 5 is stored, and the DSP (Digital Signal Processor) 1001 that is the arithmetic processing unit is stored in the program stored in the ROM 1002. Therefore, arithmetic processing is performed to realize wobble signal processing.
- the DSP 1001 has a RAM for storing data necessary for arithmetic processing.
- Examples of the recording medium according to the present invention include a ROM for storing a program and a flash memory.
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- Optical Recording Or Reproduction (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06731742A EP1879185A4 (en) | 2005-04-13 | 2006-04-13 | WOBBLE SIGNAL PROCESSING METHOD, RECORDING AND PLAYING PROCESS FOR AN OPTICAL DATA CARRIER, OPTICAL DATA DISC EQUIPMENT, PROGRAM AND RECORDING MEDIUM |
US11/911,261 US7738326B2 (en) | 2005-04-13 | 2006-04-13 | Signal processing method of wobble signal, recording and reproducing method of optical disc, optical disc apparatus, program, and recording medium |
JP2007521212A JP4835950B2 (ja) | 2005-04-13 | 2006-04-13 | ウォブル信号の信号処理方法、光ディスクの記録及び再生方法、光ディスク装置、プログラム、及び記録媒体 |
Applications Claiming Priority (2)
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JP2005-115269 | 2005-04-13 | ||
JP2005115269 | 2005-04-13 |
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WO2006112342A1 true WO2006112342A1 (ja) | 2006-10-26 |
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PCT/JP2006/307806 WO2006112342A1 (ja) | 2005-04-13 | 2006-04-13 | ウォブル信号の信号処理方法、光ディスクの記録及び再生方法、光ディスク装置、プログラム、及び記録媒体 |
Country Status (5)
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US (1) | US7738326B2 (ja) |
EP (1) | EP1879185A4 (ja) |
JP (1) | JP4835950B2 (ja) |
KR (1) | KR100960983B1 (ja) |
WO (1) | WO2006112342A1 (ja) |
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JP2012034341A (ja) * | 2010-06-30 | 2012-02-16 | Sanyo Electric Co Ltd | 表示装置 |
US20120299805A1 (en) * | 2011-05-26 | 2012-11-29 | Sanyo Electric., Ltd. | Projection display apparatus |
US9490944B2 (en) * | 2012-10-12 | 2016-11-08 | Innoventure L.P. | Phase sector based RF signal acquisition |
JP2014130658A (ja) * | 2012-12-28 | 2014-07-10 | Toshiba Corp | コントローラ、ディスク装置、及び再生処理方法 |
US9768607B2 (en) * | 2015-05-11 | 2017-09-19 | Infineon Technologies Ag | System and method for a multi-phase snubber circuit |
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- 2006-04-13 EP EP06731742A patent/EP1879185A4/en not_active Withdrawn
- 2006-04-13 WO PCT/JP2006/307806 patent/WO2006112342A1/ja active Application Filing
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Publication number | Publication date |
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JP4835950B2 (ja) | 2011-12-14 |
KR100960983B1 (ko) | 2010-06-03 |
JPWO2006112342A1 (ja) | 2008-12-11 |
US7738326B2 (en) | 2010-06-15 |
EP1879185A1 (en) | 2008-01-16 |
US20090073822A1 (en) | 2009-03-19 |
EP1879185A4 (en) | 2008-11-26 |
KR20080005267A (ko) | 2008-01-10 |
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