WO2008020352A2 - Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs - Google Patents
Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs Download PDFInfo
- Publication number
- WO2008020352A2 WO2008020352A2 PCT/IB2007/052940 IB2007052940W WO2008020352A2 WO 2008020352 A2 WO2008020352 A2 WO 2008020352A2 IB 2007052940 W IB2007052940 W IB 2007052940W WO 2008020352 A2 WO2008020352 A2 WO 2008020352A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- beta
- writing
- test
- optical disc
- disc
- Prior art date
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Classifications
-
- 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
-
- 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
-
- 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
- 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
- G11B7/0079—Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas
Definitions
- the present invention relates generally to optical storage systems, and more specifically to a method of and apparatus for to predicting beta (power) as a function of speed for continuous angular velocity (CAV) speed profiles, or equivalently, as a function of disc radius for CAV writing, for high speed writing on unknown recordable optica! discs.
- beta power
- CAV continuous angular velocity
- the correct amount of laser power needed for optical media recording is variable and depends on both the individual recorder, media and sometimes even the specific location on the media. Moreover, due to their physical makeup, the various types of materials used in optical media have different sized power windows (i.e., the range of laser energy that will properly form the correct sized pulses on the media) and therefore require different amounts of laser power for proper recording. Power windows can vary not only between the type of media used, but also upon the speed at which the data is being recorded. This is significant since too much power will create oversized pulses, while too little power will produce undersized marks.
- the size and optical quality of the laser it uses for writing varies from unit to unit as does its wavelength, which can change depending upon temperature and other environmental conditions.
- the emission frequency of most lasers is temperature sensitive, and thus writing performed at the extremes of the allowable operational temperature range can result in a significant spread of wavelengths. Consequently, many recorders perform an initia! Optimum Power Calibration (OPC) procedure to determine the best writing laser power setting for each disc and recorder combination.
- OPC Optimum Power Calibration
- APC Automatic Power Control
- Standards for CD, DVD, and Blue Ray discs specify a standard linear speed (so called IX speed) for a constant linear velocity (CLV) mode of operation and suggest that a laser write power variable be written on the disc or determined by testing.
- IX speed standard linear speed
- CLV constant linear velocity
- the speed claimed for CAV mode is the multiple of the standard speed at the outside edge of the disc. So a recorder operating at 16X actually operates at a linear speed of 6.3X at the inner edge of the disc and J6X at the outer edge of the disc.
- the OPC method of implementing an optimum power control comprises: performing a test recording with a plurality of writing laser power values in a predetermined area in an optical disc prior to a regular recording; and obtaining a writing laser power value from a reproduction result of the test recording area.
- a writing laser power value/ ⁇ value characteristic indicating a relation between the writing laser power value and the ⁇ value is obtained from a reproduced signal from a test record area, and is referred to, and the writing laser power value corresponding to a predetermined optimum ⁇ value is employed, sometimes referred to as a ⁇ target value, as an optimum writing laser power value.
- the ⁇ value is a parameter relating to a reproduced signal level or amplitude, and is obtained by (a+b)/(a ⁇ b) in which character a denotes a peak level (with a sign of +) of an eight to fourteen modulation (EFM) signal waveform as a returned light receiving signal of an optical pickup, and b (with a sign of-) denotes a bottom level of the returned signal.
- a denotes a peak level (with a sign of +) of an eight to fourteen modulation (EFM) signal waveform as a returned light receiving signal of an optical pickup
- EFM eight to fourteen modulation
- a well known procedure for making such a "beta target" measurement in a conventional OPC includes the steps of: (1) performing an OPC to derive an optimum laser write power, Pw__opt (2) writing a single track (i.e., I disc revolution) using the derived optimum laser write power, Pwjopt, (3) measuring N amplitudes of the written track (at a read laser power, Pr) Al 0 ...A1 n-1 and A2o ...A2 n-1 at 1 disc revolution, calculating different beta values and (4) calculating an
- the writing laser power value corresponding to the predetermined optimum ⁇ value is determined. That is, the writing laser power value is determined considering only the ⁇ value.
- a characteristic of the optical disc differs from a type to type, a quality level of a recording state is deteriorated during recording with the writing laser power value determined simply by considering only the ⁇ value.
- a relation between the writing laser power value and the ⁇ value is usually substantially linear, but sometimes turns to a nonlinear relation shown in FIG. 1 because of distortion, dyestuff unevenness, and the like of the optical disc.
- the relation between the ⁇ value and the writing laser power value has a substantially non-linear characteristic.
- Presently used OPC methods to correct disc nonlinear relations between the writing laser power and the ⁇ value is based upon information being used which is pre- stored on the disc (see for example DVD+R, Basic Format Specification, Systems Description, or Recordable Compact Disc Systems, Part II: CD-R, System Description), information may be pre-stored onto a disc which provides a recorder for example with an indicative power level with which to begin an OPC procedure.
- This information may not, however, always be available for a number of high speed recordable discs. In particular, the information is not available for those discs not mentioned in the media table.
- the present invention relates to predicting beta (power) as a function of speed for continuous angular velocity (CAV) speed profiles, or equivaJently, as a function of disc radius for CAV writing, of an optical disc apparatus, which may be executed at inner and outer test zones of a di sc, and which overcomes the problems associated with conventional OPC procedures.
- a method for predicting beta as a function of linear speed for CAV profiles, or disc radius for CAV writing, for writing electronic data on an optical disc comprising the steps of: (a) performing a plurality of test recordings of signals in an outer test zone of the optical disc at a plurality of predetermined recording velocities, wherein the test recordings is expressed in terms of an outer test zone measured beta target value obtained from a read laser beam reflected back from the power of a writing laser beam; (b) calculating at least one beta target values in a data zone of the optical disc at a predetermined recording velocity; and (c) predicting beta (power) as a function of linear speed for continuous angular velocity (CAV) speed profiles, or equivalentJy, as a function of disc radius for CAV writing, for high speed writing on the optical disc, for other linear speeds than the predetermined recording velocities, the predicting depending on the at least one calculated beta target value and the test recordings including test recording at at least two different predetermined recording
- Fig. 1 is a graph representing a relation between the writing laser power value and the ⁇ value of a typical optical disc, according to the prior art
- Fig. 2 represents a side view of a typical optical disc
- Fig.3 is a flow chart of the method of the present invention
- Fig.4 is a graph showing a relationship of beta (power) versus recording velocity for an exemplary embodiment of the present invention.
- Figure 2 shows a simplified side view of a standard disc.
- the inner disc test zone 20 and outer disc test zone 40 represent the innermost and outermost zones of the disc, respectively. Only these test zones can be used by the drive for performing disc tests and OPC algorithms.
- the data zone 30 constitutes the recordable area in which the information is recorded using a non-reversible effect.
- a single test recording of a signal is performed in the inner disc test zone 20 of the optical disc at a predetermined recording velocity (e.g., 6.3x in the present embodiment) and four additional test recordings of signals are performed in the outer disc test zone 40 of the optical disc at predetermined recording velocities (e.g., 6.3x, 8x, 12x, and 16x in the present embodiment).
- a predetermined recording velocity e.g., 6.3x in the present embodiment
- four additional test recordings of signals are performed in the outer disc test zone 40 of the optical disc at predetermined recording velocities (e.g., 6.3x, 8x, 12x, and 16x in the present embodiment).
- the five test recordings are preferably expressed in terms of a beta target value 50 (i.e., power), as shown in fig. 2, obtained from a read laser beam reflected back from the power of a writing laser beam.
- a beta target value 50 i.e., power
- Such test recording measurements are well known and are routinely performed in a test zone of an optical disc.
- beta target values are calculated at an inner recording velocity.
- two beta target values are calculated at recording velocities of 8x and 12x.
- beta target values may be calculated in accordance with the following equation:
- the measured beta target value, ⁇ out_x is considered a speed
- Equation (1) can be considered to be comprised of two components, a speed dependent component , , and a disc dependent component.
- the speed dependent component is a beta target value measured at the outer disc test zone 40 at a particular recording velocity x.
- the disc dependent component is represented by the second term of equation (1):
- Single Layer type of disc are 22.6 mm for and 58.1 ram for Rx represents the disc radius where you are recording at a particular moment
- ⁇ represents the difference between beta (power) at the inside and outside disc radius at a certain speed (e.g., 6.3x), calculated as follows:
- At least one computed beta target value is combined with at least two measured beta target values to construct a piecewise linear graph for predicting a range of beta target values as a function of speed for continuous angular velocity (CAV) speed profiles, or equivalency, as a function of disc radius for CAV writing, for high speed writing on unknown recordable optical discs.
- the piecewise linear graph may be constructed using all calculated beta target values. It is observed, however, that this is unnecessary in that certain beta target values, measured in the test zone are equivalent to their calculated values, as will be described as follows. It is therefore only required to calculate those beta target values which are not equivalent to their measured values.
- beta target values are measured, one in the inner test zone of the optical disc, and four in the outer test zone of the optica! disc , and (see fig. 2).
- two beta target values are calculated nd
- two of the five measured beta target values and have computed or predicted values which are equal to their measured values. As such, these two measured values may be used in lieu of performing a calculation.
- Equation (4) is the result of calculating a beta target value, in accordance with equation (1), for a boundary recording velocity of 6.3x. As shown, the calculated result (LHS) is equal to the inner test zone measured result (RHS).
- This equivalence may be exploited by the method of the invention to reduce the number of required calculations to construct a predictive piecewise linear graph.
- a method for predicting beta (power) as a function of speed for continuous angular velocity (CAV) speed profiles, or equivalently, as a function of disc radius for CAV writing, for high speed writing on unknown recordable optical discs includes the following steps. At step 302, a single test recording is performed in an inner test zone 20 of the disc (see fig.
- a single test recording is performed at a recording velocity of 6.3x, in the inner test zone 20 of the disc to acquire a single measured beta target value of
- at least two additional test recordings are performed in the outer test zone 40 of the disc (see fig. 2) at predetermined recording velocities to obtain at least two corresponding measured beta target values.
- four additional test recordings are performed at recording velocities of 6.3x, 8x, J2x and l ⁇ x, in the outer test zone 40 of the disc (see fig.
- the measured values are equal to their calculated or predictive value, as computed by equation ( 1). These values are referred to herein as lower aad upper boundary values.
- Al step 306 for those measured beta target values that are not equal to their calculated or predictive value, a predictive or calculated beta target value calculation is performed.
- two beta target values are considered to be non-boundary (inner) recording velocities, i.e., 8x and 12x, for which the following computations are performed, according to equation (I).
- the calculated beta target values are used together with the measured boundary beta target values to construct a piecewise linear graph for predicting beta (power) as a function of speed for continuous angular velocity (CAV) speed profiles, or equivalently, as a function of disc radius for CAV writing, for high speed writing on unknown recordable optical discs.
- the data points may be used to construct
- Fig. 4 is a graph of power, expressed as beta [%], versus recording velocity, R[m].
- the graph is comprised of two curves, a first curve, labeled "Al”, illustrating a prior art linear interpolation of predictive beta target data values versus recording velocity, R[m], and a second curve, generated in accordance with invention principles, which is a piecewise linear interpolation of predictive beta target values versus recording velocity R[m], comprised of three segments, respectively labeled B1 B2 and B3, and referred to hereafter as inventive curve "B".
- prior art curve "A1” the linear interpolation is based on two measured beta target endpoint values, which are measurable in the test zone portions 20, 40 of the optical disc (as shown in fig. 1).
- the two beta target endpoint values are ⁇ t 6.3.x , and ⁇ tt ⁇ «.
- Prior art curve "Ai” predicts the beta target values in the data zone 30 of an optical disc as being linearly distributed versus recording velocity R[m] over the range 6.3x - 16x.
- the inventor has experimentally determined that the true or actual beta target values in the data zone 40 of the optical disc comprise a non-linear distribution, as illustrated by two experimentally measured points, M1 and M2, measured at respective recording velocities of 8x and 12x. It is noted that the prior art predictive curve is a poor approximation to the true or actual beta target values. For example, it is shown that for the experimentally measured data point Ml , which is the true or actual beat target value at R8x, its measured value is approximately -4.2, as viewed on the graph. The predicted value, using the prior art approach, is approximately -1 , resulting in a significant delta of -3.2.
- the predicted value according to the invention is approximately -4.1, resulting in a delta of -0.1. It is therefore shown that the invention provides an significant improvement in predictive accuracy over the prior art, as evidenced by way of example in Fig. 4.
- the inventive curve "B” is significantly more predictive of the actual beta target values than the prior art curve "A", which utilizes only a single segment "Al".
- Table 1 is provided to further illustrate that the inventive graph "B" of Fig. 4 is constructed from a set of raw data points including both measured and calculated beta target values, to construct the various piecewise linear segments.
- Table I is provided to further illustrate that the inventive graph "B" of Fig. 4 is constructed from a set of raw data points including both measured and calculated beta target values, to construct the various piecewise linear segments.
- a first piece wise linear segment B1 of inventive graph B (row 1) is constructed from a starting segment endpoint value of which is a measurable value in the test region of the optical disc.
- the ending segment endpoint value is a calculated value, calculated in accordance with equation (4) above, which is a particular application of genera! equation (1).
- the second segment B2 of inventive graph B uses two calculated values, one for the starting segment endpoint and one for the ending segment endpoints,
- the third segment B3 of inventive graph B uses a combination of calculated and measured values for the respective starting and ending segment endpoints. Specifically, the starting segment endpoint is a calculated value, and the ending segment endpoint is a measured segment endpoint ⁇
- beta target values were calculated at respective inner recording velocities of 8x and 12x to yield a three-segment piecewise linear interpolation of predictive beta target values, as illustrated in Fig. 4. It should be understood, however, that there is no limitation in the invention regarding the number of beta target values that may be calculated at the inner recording velocities to perform the prediction. Of course, it is understood that there is a direct correspondence between the number of beta target values calculated and the predictive accuracy.
- the predictive values may be computed using any well known curve fitting method to derive the predicted values from the raw data points, which may or may not pass directly through the raw data points.
- the present invention is applicable to any optical recording medium where an optimum laser power is desired for writing information to the medium.
- the present invention is applicable, but not limited to, CD- R(W), DV1H-R(W), DVD-R .pL, DVD-RWJDL, and Blu-ray Disc, etc.
- Those skilled in the art wil! know how to modify the above embodiment for higher or lower speeds than 16X CAV recording or for P-CAV or Z-CLV recording.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2007800303873A CN101506882B (en) | 2006-08-15 | 2007-07-24 | Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs |
JP2009524261A JP2010500700A (en) | 2006-08-15 | 2007-07-24 | Method and apparatus for predicting beta for high speed writing to unknown recordable optical disc |
US12/377,142 US8014243B2 (en) | 2006-08-15 | 2007-07-24 | Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs |
EP07805223A EP2054887A2 (en) | 2006-08-15 | 2007-07-24 | Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs |
Applications Claiming Priority (2)
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US82238906P | 2006-08-15 | 2006-08-15 | |
US60/822,389 | 2006-08-15 |
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WO2008020352A2 true WO2008020352A2 (en) | 2008-02-21 |
WO2008020352A3 WO2008020352A3 (en) | 2008-05-08 |
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PCT/IB2007/052940 WO2008020352A2 (en) | 2006-08-15 | 2007-07-24 | Method and apparatus for performing beta prediction for high-speed writing on unknown recordable optical discs |
Country Status (7)
Country | Link |
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US (1) | US8014243B2 (en) |
EP (1) | EP2054887A2 (en) |
JP (1) | JP2010500700A (en) |
KR (1) | KR20090041429A (en) |
CN (1) | CN101506882B (en) |
TW (1) | TW200818153A (en) |
WO (1) | WO2008020352A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8391114B2 (en) | 2011-03-17 | 2013-03-05 | Teac Corporation | Optical disk drive |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020105874A1 (en) * | 2001-02-05 | 2002-08-08 | Keishi Matsumoto | Optical disc apparatus with regulation of recording velocity and laser power |
EP1351225A2 (en) * | 2002-03-22 | 2003-10-08 | Yamaha Corporation | Optical disc recording method and optical disc recording apparatus |
WO2005093732A1 (en) * | 2004-03-23 | 2005-10-06 | Koninklijke Philips Electronics N.V. | Optimum power control for optical storage media |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002042339A (en) | 2000-07-19 | 2002-02-08 | Teac Corp | Optical disk recorder |
JP3820965B2 (en) | 2001-09-04 | 2006-09-13 | 日本電気株式会社 | Recording / reproducing condition adjusting method for information recording medium and recording / reproducing apparatus using the same |
JP3763765B2 (en) * | 2001-09-27 | 2006-04-05 | シャープ株式会社 | Disk unit |
US6980497B2 (en) | 2001-10-10 | 2005-12-27 | Sanyo Electric Co., Ltd. | Optical disk recording apparatus and control method thereof |
US6882610B2 (en) | 2002-02-21 | 2005-04-19 | Mediatek Incorporation | Optimal power calibration method for an optical disc |
KR20030082262A (en) | 2002-04-17 | 2003-10-22 | 삼성전자주식회사 | Apparatus and method for changing write speed of optical writing media during writing |
JP2004103208A (en) | 2002-07-18 | 2004-04-02 | Nec Corp | Information recording medium, method for indicator generation, manufacturing method, recording condition adjusting method, and recording method for the same medium, and information recorder |
JP2005116027A (en) | 2003-10-06 | 2005-04-28 | Ricoh Co Ltd | Method and device for deciding recording power, and optical disk device |
CN1622206A (en) | 2003-11-26 | 2005-06-01 | 皇家飞利浦电子股份有限公司 | Optical disc writing parameter optimization method and device |
JP2005209243A (en) | 2004-01-20 | 2005-08-04 | Ricoh Co Ltd | Evaluation method, recording method, program, recording medium, and optical disk drive |
KR20070008722A (en) | 2004-05-12 | 2007-01-17 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Optical power control |
JP4289231B2 (en) | 2004-06-29 | 2009-07-01 | ヤマハ株式会社 | Optical disc recording method and apparatus |
JP4234109B2 (en) | 2004-10-18 | 2009-03-04 | 株式会社リコー | Optical pickup device and information recording device using the same |
JP2006172529A (en) * | 2004-12-13 | 2006-06-29 | Matsushita Electric Ind Co Ltd | Optical disk drive |
US7933176B2 (en) | 2005-03-15 | 2011-04-26 | Koninklijke Philips Electronics N.V. | Apparatus and method for determining write strategy parameters for recording data on an optical record carrier and for determining read parameters for reading data from an optical record carrier |
-
2007
- 2007-07-24 WO PCT/IB2007/052940 patent/WO2008020352A2/en active Application Filing
- 2007-07-24 CN CN2007800303873A patent/CN101506882B/en not_active Expired - Fee Related
- 2007-07-24 US US12/377,142 patent/US8014243B2/en not_active Expired - Fee Related
- 2007-07-24 EP EP07805223A patent/EP2054887A2/en not_active Withdrawn
- 2007-07-24 KR KR1020097005105A patent/KR20090041429A/en not_active Application Discontinuation
- 2007-07-24 JP JP2009524261A patent/JP2010500700A/en active Pending
- 2007-08-10 TW TW096129765A patent/TW200818153A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020105874A1 (en) * | 2001-02-05 | 2002-08-08 | Keishi Matsumoto | Optical disc apparatus with regulation of recording velocity and laser power |
EP1351225A2 (en) * | 2002-03-22 | 2003-10-08 | Yamaha Corporation | Optical disc recording method and optical disc recording apparatus |
WO2005093732A1 (en) * | 2004-03-23 | 2005-10-06 | Koninklijke Philips Electronics N.V. | Optimum power control for optical storage media |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8391114B2 (en) | 2011-03-17 | 2013-03-05 | Teac Corporation | Optical disk drive |
Also Published As
Publication number | Publication date |
---|---|
CN101506882A (en) | 2009-08-12 |
CN101506882B (en) | 2011-05-18 |
US8014243B2 (en) | 2011-09-06 |
TW200818153A (en) | 2008-04-16 |
KR20090041429A (en) | 2009-04-28 |
JP2010500700A (en) | 2010-01-07 |
US20100177609A1 (en) | 2010-07-15 |
EP2054887A2 (en) | 2009-05-06 |
WO2008020352A3 (en) | 2008-05-08 |
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