WO2008001314A1 - A method and apparatus of optimizing write parameters for a rewritable optical disc - Google Patents

A method and apparatus of optimizing write parameters for a rewritable optical disc Download PDF

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Publication number
WO2008001314A1
WO2008001314A1 PCT/IB2007/052482 IB2007052482W WO2008001314A1 WO 2008001314 A1 WO2008001314 A1 WO 2008001314A1 IB 2007052482 W IB2007052482 W IB 2007052482W WO 2008001314 A1 WO2008001314 A1 WO 2008001314A1
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WO
WIPO (PCT)
Prior art keywords
optical disc
tmp
rewritable optical
dttop
margin
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Application number
PCT/IB2007/052482
Other languages
French (fr)
Inventor
Jianyi Zhong
Jing Tao
Gongming Wei
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Koninklijke Philips Electronics N.V.
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Publication of WO2008001314A1 publication Critical patent/WO2008001314A1/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—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
    • G11B20/10481—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
    • 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
    • G11B7/12—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 invention relates to a method and apparatus of optimizing write parameters for a rewritable optical disc.
  • rewritable optical discs are used widely. Therefore, write times of a rewriteable optical disc are a very important quality indication.
  • the write times of a rewritable optical disc are not only dependent on the stack design and producing process, but are also determined by how it was written.
  • rewritable optical discs comprise many standardized formats (types), e.g. CD-RW (Compact Disc-
  • each standardized format of rewritable optical disc may have different properties and behave differently when exposed to a train of write pulses from a laser beam.
  • each standardized format of rewritable optical disc, for example DVD-RW may comprise many brands made by different companies, and each brand of rewritable optical disc may possess different material properties and also behave differently when exposed to a train of write pulses from a laser beam.
  • Most methods of optimizing write parameters comprise the steps of: (1) selecting a write power range and other write parameters for each type/brand of rewritable optical disc in a laboratory setting; (2) storing the selected write parameters of each type/brand of rewritable optical disc in a developed drive; or storing the selected write parameters of each type of rewritable optical disc in a specific area of a rewritable optical disc during mass production; (3) retrieving the write parameters from the rewritable optical disc, or from the developed drive; (4) optimizing a write power according to the stored write parameters of a rewritable optical disc which is being rewritten.
  • the stored write parameters may be difficult to adapt to a new type/brand of rewritable optical disc which is unknown to the developed drive; so it is not easy to improve the DOW cycle-ability of a rewritable optical disc which is unknown to the developed drive.
  • the method of optimizing write parameters for a rewritable optical disc comprises the steps of:
  • predefined write parameters comprise a power indicator Pw in d and an initial Epsilon value ⁇
  • Tmp is a multiple pulse time
  • dTtop is a first pulse lead-time
  • T is a clock period
  • the invention also proposes an apparatus comprising a processing unit for implementing the different steps of said method according to the invention.
  • Fig. 1 is a schematic diagram illustrating parameters of writing a mark on a rewritable optical disc
  • Fig. 2 shows how the DOW cycle-ability of a rewritable optical disc is affected by timing parameters
  • Fig. 3 is a flow chart illustrating the method of the invention with an embodiment
  • Fig. 4 shows the improved DOW cycle-ability of the method according to the invention by comparing said method with a conventional method
  • Fig. 5 depicts an apparatus for implementing the embodiment of the method as described above.
  • Fig. 1 is a schematic diagram illustrating the parameters of writing a mark on a rewritable optical disc, using a write strategy IT and a write speed of 2Ax, where T is a clock period.
  • Pw is a write power
  • Pb is a bias power for laser diodes.
  • Pe is an erase power. Pe is smaller than Pw and larger than the Pb. Pe is used to erase data on a rewritable optical disc.
  • Ttop is a first pulse time
  • dTtop is a first pulse lead-time
  • Tmp is a multiple pulse time
  • Tera is an erase lead-time.
  • Factors affecting the DOW cycle-ability of a rewriteable optical disc include many write parameters, such as Pw, Pe, Epsilon value ⁇ , and timing parameters (e.g. Tmp, Ttop, dTtop, Tera etc). It is noted that ⁇ is equal to Pe/Pw.
  • a jitter value is used to reflect the quality of writing a rewritable optical disc. As the jitter value is smaller, the quality of writing a rewritable optical disc is better.
  • a maximum jitter value for a qualified rewritable optical disc is predefined according to different standardized format specifications of rewritable optical discs. The jitter value can't be higher than the maximum jitter value, when rewriting a rewritable optical disc.
  • DOW times corresponds to the third curve with "two crossing lines" shape dot. If the jitter limitation is set to 10%, as shown by means of the dashed line in Fig. 2, the DOW times are about 380.
  • Fig. 2 shows that a timing parameter obviously affects the DOW cycle- ability (DOW times).
  • an embodiment of the invention selects a specific pair of Tmp and dTtop to optimize write parameters, so as to improve the DOW cycle- ability of a rewritable optical disc.
  • the specific range of Tmp is [8T/40, 14T/40]
  • the specific range of dTtop is [1 IT/40, 17T/40].
  • Fig. 3 is a flow chart illustrating the method of the invention by means of an embodiment. The method of optimizing write parameters for a rewritable optical disc comprises the steps of:
  • predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pw in d and an initial Epsilon value ⁇ .
  • the rewritable optical disc may comprise other predefined write parameters, such as a write speed.
  • the predefined write parameters are written on the rewritable optical disc according to a standardized format of the rewritable optical disc.
  • Tmp from a range [8T/40, 14T/40] and a dTtop from a range [11T/40, 17T/40], where Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period.
  • the selecting (320) step is further intentioned to select a Tera and a Ttop according to the selected Tmp and dTtop.
  • Tera is an erase lead-time
  • Ttop is a first pulse time.
  • Tera can be equal to 0, and Ttop can be equal to Tmp.
  • Tmp, dTtop, Tera, and Ttop can affect jitter values.
  • the jitter value corresponds to a good write quality and is advantageous to improve the DOW cycle-ability of the rewritable optical disc.
  • the adaptive jitter value is as small as possible and at least smaller than the maximum jitter value predefined according to the standardized format of the rewritable optical disc.
  • the adjusting (330) step can be implemented by a 2 nd -order polynomial or a parabola formula.
  • the generating step (340) may also check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in a standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive. If the margin of the optimized Pw is not smaller than the predefined margin threshold, output the Pw; if the margin of the optimized Pw is smaller than the predefined margin threshold, then return to the selecting (320) step.
  • Fig. 4 shows an improved DOW cycle-ability of the embodiment of the method according to the invention by comparing said method with a conventional method. Both the method of the invention and the conventional method are implemented by writing a rewritable optical disc (4x DVD RW) at a write speed of 2.4x:
  • the relationship between the jitter values and the DOW times corresponds to the first curve with "three crossing lines" shape dot. In this situation, the cycle-ability is less than 400 times, if the jitter limitation is set to 10%, as shown in Fig.
  • Tmp 8T/40
  • Ttop 8T/40
  • Tera 0
  • dTtop 17T/40
  • the relationship between the jitter values and the DOW times corresponds to the second curve with "square" shape dot. In this situation, the cycle- ability is near to 1,000 times, if the jitter limitation is set to 10%, as shown in Fig. 4.
  • Fig. 5 depicts an apparatus for implementing the embodiment of the method as described above.
  • the embodiment is implemented on a rewritable optical disc (4x DVD- RW) with a write speed ⁇ 4x.
  • the apparatus 500 for optimizing write parameters for a rewritable optical disc comprises:
  • a reading unit (510) for reading out predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pw ind and an initial Epsilon value ⁇ .
  • the predefined write parameters are written on the rewritable optical disc according to a standardized format of the rewritable optical disc.
  • a selecting unit (520) for selecting a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [1 IT/40, 17T/40], where Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period.
  • the selecting unit (520) is further used to select a Tera and a Ttop according to the selected
  • Tmp and dTtop Tera is an erase lead-time, and Ttop is a first pulse time.
  • the jitter value corresponds to a good write quality and is advantageous to improve the DOW cycle-ability of the rewritable optical disc.
  • the adaptive jitter value is as small as possible and at least smaller than the maximum jitter value predefined according to the standardized format of the rewritable optical disc.
  • the adjusting unit (530) can adjust the ⁇ by a 2 nd -order polynomial or a parabola formula.
  • a generating unit (540) for generating an optimized write power Pw based on the jitter value and the adjusted ⁇ .
  • the generating unit (540) may be also used to check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in the standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive. If the margin of optimized Pw is not smaller than the predefined margin threshold, output the Pw; if the margin of the optimized Pw is smaller than the predefined margin threshold, then return to the selecting unit (520) to select another pair of Tmp and dTtop.
  • This apparatus may advantageously be integrated in a recorder for optical discs (e.g. computer disc drive, standalone apparatus).
  • optical discs e.g. computer disc drive, standalone apparatus.
  • any reference signs placed between parentheses shall not be constructed as limiting the claim.
  • the word 'comprising' does not exclude the presence of elements or steps not listed in a claim.
  • the word "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the invention can be implemented by units of hardware comprising several distinct elements and by units of a suitable programmed computer. In the unit claims enumerating several units, several of these units can be embodied by one and the same item of hardware.
  • the usage of the words first, second and third, etcetera does not indicate any ordering. These words are to be interpreted as names.

Abstract

A method of optimizing write parameters for a rewritable optical disc comprises the steps of: reading out (310) predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pwind and an initial Epsilon value ε, selecting (320) a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [11T/40, 17T/40], where Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period, adjusting (330) ε to adapt to a jitter value according to the value of Pwind, and generating (340) an optimized write power Pw based on the jitter value and the adjusted ε.

Description

A METHOD AND APPARATUS OF OPTIMIZING WRITE PARAMETERS FOR A
REWRITABLE OPTICAL DISC
The invention relates to a method and apparatus of optimizing write parameters for a rewritable optical disc.
By virtue of being rewritable, rewritable optical discs are used widely. Therefore, write times of a rewriteable optical disc are a very important quality indication. The write times of a rewritable optical disc are not only dependent on the stack design and producing process, but are also determined by how it was written. However, rewritable optical discs comprise many standardized formats (types), e.g. CD-RW (Compact Disc-
Rewritable), DVD-RW (Digital versatile Disc-Rewritable), BD-RW (Blu-ray Disc- Rewritable). Each standardized format of rewritable optical disc may have different properties and behave differently when exposed to a train of write pulses from a laser beam. Furthermore, each standardized format of rewritable optical disc, for example DVD-RW, may comprise many brands made by different companies, and each brand of rewritable optical disc may possess different material properties and also behave differently when exposed to a train of write pulses from a laser beam. Thus, it is important to optimize write parameters for adapting the writing process to different standardized formats/brands of rewritable optical discs, so as to improve the DOW (Direct Over-Write) cycle-ability (write times) of a rewritable optical disc.
Most methods of optimizing write parameters comprise the steps of: (1) selecting a write power range and other write parameters for each type/brand of rewritable optical disc in a laboratory setting; (2) storing the selected write parameters of each type/brand of rewritable optical disc in a developed drive; or storing the selected write parameters of each type of rewritable optical disc in a specific area of a rewritable optical disc during mass production; (3) retrieving the write parameters from the rewritable optical disc, or from the developed drive; (4) optimizing a write power according to the stored write parameters of a rewritable optical disc which is being rewritten.
In practice, the methods as mentioned above still cannot provide adaptive write parameters to efficiently improve the DOW cycle-ability of a rewritable optical disc.
Furthermore, the stored write parameters may be difficult to adapt to a new type/brand of rewritable optical disc which is unknown to the developed drive; so it is not easy to improve the DOW cycle-ability of a rewritable optical disc which is unknown to the developed drive.
It is an object of the invention to provide an improved method of optimizing write parameters for a rewritable optical disc, so as to improve the DOW cycle-ability of a rewritable optical disc.
The method of optimizing write parameters for a rewritable optical disc comprises the steps of:
- reading out predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pwind and an initial Epsilon value ε,
- selecting a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [11T/40, 17T/40], where Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period,
- adjusting the ε to adapt to a jitter value according to the Pwind, and
- generating an optimized write power Pw based on the jitter value and the adjusted ε.
The invention also proposes an apparatus comprising a processing unit for implementing the different steps of said method according to the invention.
Selecting a specific combination of Tmp and dTtop from a range of [8T/40, 14T/40] and [11T/40, 17T/40], respectively, to optimize write parameters, has the advantage that the method and apparatus of the invention can effectively improve the DOW cycle-ability of a rewritable optical disc.
These and other aspects of the method and apparatus for optimizing write parameters for a rewritable optical disc according to the invention, will become apparent from and will be elucidated with respect to the implementations and embodiments described hereinafter and with reference to the accompanying drawings, wherein: Fig. 1 is a schematic diagram illustrating parameters of writing a mark on a rewritable optical disc,
Fig. 2 shows how the DOW cycle-ability of a rewritable optical disc is affected by timing parameters, Fig. 3 is a flow chart illustrating the method of the invention with an embodiment,
Fig. 4 shows the improved DOW cycle-ability of the method according to the invention by comparing said method with a conventional method,
Fig. 5 depicts an apparatus for implementing the embodiment of the method as described above.
Same reference numerals are used to denote similar parts throughout the Figures.
The technical measures of the present invention will be described in detail hereinafter by way of embodiments and with reference to the drawings.
Fig. 1 is a schematic diagram illustrating the parameters of writing a mark on a rewritable optical disc, using a write strategy IT and a write speed of 2Ax, where T is a clock period.
Pw is a write power, and Pb is a bias power for laser diodes. Pe is an erase power. Pe is smaller than Pw and larger than the Pb. Pe is used to erase data on a rewritable optical disc.
Ttop is a first pulse time, and dTtop is a first pulse lead-time. Tmp is a multiple pulse time, and Tera is an erase lead-time.
Factors affecting the DOW cycle-ability of a rewriteable optical disc include many write parameters, such as Pw, Pe, Epsilon value ε, and timing parameters (e.g. Tmp, Ttop, dTtop, Tera etc). It is noted that ε is equal to Pe/Pw.
In addition, a jitter value is used to reflect the quality of writing a rewritable optical disc. As the jitter value is smaller, the quality of writing a rewritable optical disc is better. A maximum jitter value for a qualified rewritable optical disc is predefined according to different standardized format specifications of rewritable optical discs. The jitter value can't be higher than the maximum jitter value, when rewriting a rewritable optical disc. Fig. 2 shows how the DOW cycle-ability of a rewritable optical disc is affected by timing parameters. The result shown in Fig. 2 is realized by writing a rewritable optical disc (4x DVD RW) at a write speed of 2Ax, Ttop=Tmp, Tera=7T/40, dTtop=0, and Pw=430:
(1) When Tmp is equal to 20T/40, the relationship between the jitter value and the DOW times corresponds to the first curve with "square" shape dot. If the jitter limitation is set to 10%, as shown by means of the dashed line in Fig. 2, the DOW times are about 170.
(2) When Tmp is equal to 17T/40, the relationship between the jitter value and the DOW times corresponds to the second curve with "triangle" shape dot. If the jitter limitation is set to 10%, as shown by means of the dashed line in Fig. 2, the DOW times are about 190. (3) When Tmp is equal to 14T/40, the relationship between jitter value and
DOW times corresponds to the third curve with "two crossing lines" shape dot. If the jitter limitation is set to 10%, as shown by means of the dashed line in Fig. 2, the DOW times are about 380.
(4) When Tmp is equal to 11T/40, the relationship between jitter value and the DOW times corresponds to the fourth curve with "three crossing lines" shape dot. If the jitter limitation is set to 10%, as shown by means of the dashed line in Fig. 2, the DOW times are about 420.
Thus, Fig. 2 shows that a timing parameter obviously affects the DOW cycle- ability (DOW times).
According to the test of how the DOW cycle-ability of a rewritable optical disc is affected by the timing parameters, an embodiment of the invention selects a specific pair of Tmp and dTtop to optimize write parameters, so as to improve the DOW cycle- ability of a rewritable optical disc. The specific range of Tmp is [8T/40, 14T/40], and the specific range of dTtop is [1 IT/40, 17T/40]. Fig. 3 is a flow chart illustrating the method of the invention by means of an embodiment. The method of optimizing write parameters for a rewritable optical disc comprises the steps of:
- reading out (310) predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pwind and an initial Epsilon value ε. The rewritable optical disc may comprise other predefined write parameters, such as a write speed. The predefined write parameters are written on the rewritable optical disc according to a standardized format of the rewritable optical disc.
- selecting (320) a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [11T/40, 17T/40], where Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period. For example, the selected combination of Tmp and dTtop can be: Tmp=8T/40 and dTtop=17T/40, Tmp=l IT/40 and dTtop=13T/40, or Tmp=14T/40 and dTtop=13T/40. The selecting (320) step is further intentioned to select a Tera and a Ttop according to the selected Tmp and dTtop. Tera is an erase lead-time, and Ttop is a first pulse time. Tera can be equal to 0, and Ttop can be equal to Tmp. Tmp, dTtop, Tera, and Ttop can affect jitter values.
- adjusting (330) ε to adapt to a jitter value according to the value of Pwind.
The jitter value corresponds to a good write quality and is advantageous to improve the DOW cycle-ability of the rewritable optical disc. The adaptive jitter value is as small as possible and at least smaller than the maximum jitter value predefined according to the standardized format of the rewritable optical disc. The adjusting (330) step can be implemented by a 2nd-order polynomial or a parabola formula.
- generating (340) an optimized write power Pw based on the jitter value and the adjusted ε. The erase power Pe can be calculated from an equation: ε=Pe/Pw. Based on the adjusted ε and the jitter value, the Pw can be generated by a parabola formula. The generating step (340) may also check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in a standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive. If the margin of the optimized Pw is not smaller than the predefined margin threshold, output the Pw; if the margin of the optimized Pw is smaller than the predefined margin threshold, then return to the selecting (320) step.
The advantages of the embodiment of the method are outlined through the example shown in Fig. 4. Fig. 4 shows an improved DOW cycle-ability of the embodiment of the method according to the invention by comparing said method with a conventional method. Both the method of the invention and the conventional method are implemented by writing a rewritable optical disc (4x DVD RW) at a write speed of 2.4x:
(1) Based on the conventional method: Tmp=20T/40, Ttop =201740, Tera=0, dTtop=13T/40, Pw=430, ε=0.56. The relationship between the jitter values and the DOW times corresponds to the first curve with "three crossing lines" shape dot. In this situation, the cycle-ability is less than 400 times, if the jitter limitation is set to 10%, as shown in Fig.
4.
(2) Based on the method of the invention: Tmp =8T/40, Ttop =8T/40, Tera=0, dTtop=17T/40, Pw=430, ε=0.4. The relationship between the jitter values and the DOW times corresponds to the second curve with "square" shape dot. In this situation, the cycle- ability is near to 1,000 times, if the jitter limitation is set to 10%, as shown in Fig. 4.
Fig. 5 depicts an apparatus for implementing the embodiment of the method as described above. The embodiment is implemented on a rewritable optical disc (4x DVD- RW) with a write speed≤ 4x. The apparatus 500 for optimizing write parameters for a rewritable optical disc comprises:
- a reading unit (510) for reading out predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pwind and an initial Epsilon value ε. The predefined write parameters are written on the rewritable optical disc according to a standardized format of the rewritable optical disc. - a selecting unit (520) for selecting a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [1 IT/40, 17T/40], where Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period. The selecting unit (520) is further used to select a Tera and a Ttop according to the selected
Tmp and dTtop. Tera is an erase lead-time, and Ttop is a first pulse time.
- an adjusting unit (530) for adjusting ε to adapt to a jitter value according to the Pwmd. The jitter value corresponds to a good write quality and is advantageous to improve the DOW cycle-ability of the rewritable optical disc. The adaptive jitter value is as small as possible and at least smaller than the maximum jitter value predefined according to the standardized format of the rewritable optical disc. The adjusting unit (530) can adjust the ε by a 2nd-order polynomial or a parabola formula.
- a generating unit (540) for generating an optimized write power Pw based on the jitter value and the adjusted ε. The generating unit (540) may be also used to check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in the standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive. If the margin of optimized Pw is not smaller than the predefined margin threshold, output the Pw; if the margin of the optimized Pw is smaller than the predefined margin threshold, then return to the selecting unit (520) to select another pair of Tmp and dTtop.
This apparatus may advantageously be integrated in a recorder for optical discs (e.g. computer disc drive, standalone apparatus...).
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be constructed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by units of hardware comprising several distinct elements and by units of a suitable programmed computer. In the unit claims enumerating several units, several of these units can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera, does not indicate any ordering. These words are to be interpreted as names.

Claims

1. A method of optimizing write parameters for a rewritable optical disc comprising the steps of: - reading out (310) predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pwind and an initial Epsilon value ε,
- selecting (320) a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [11T/40, 17T/40], wherein Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period,
- adjusting (330) ε to adapt to a jitter value according to the value of Pwind, and
- generating (340) an optimized write power Pw based on the jitter value and the adjusted ε.
2. A method as claimed in claim 1, wherein the selecting (320) step is further intended to select a Tera and a Ttop according to the selected Tmp and dTtop, wherein Tera is an erase lead-time and Ttop is a first pulse time.
3. A method as claimed in claim 2, wherein Tera is equal to 0, and Ttop is equal to Tmp.
4. A method as claimed in claim 1, wherein the generating (340) step is intended to check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in a standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive; if the margin of the optimized Pw is not smaller than the predefined margin threshold, output the Pw.
5. A method as claimed in claim 1, wherein the generating (340) step is further intended to check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in a standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive; if the margin of the optimized Pw is smaller than the predefined margin threshold, then return to the selecting (320) step.
6. A method as claimed in claim 1, wherein the combination of Tmp and dTtop is intended to be Tmp=8T/40 and dTtop=17T/40, Tmp=l lT/40 and dTtop=13T/40, or Tmp=14T/40 and dTtop=13T/40.
7. An apparatus for optimizing write parameters for a rewritable optical disc, said apparatus comprising:
- a reading unit (510) for reading out predefined write parameters from the rewritable optical disc, which predefined write parameters comprise a power indicator Pwind and an initial Epsilon value ε,
- a selecting unit (520) for selecting a Tmp from a range [8T/40, 14T/40] and a dTtop from a range [11T/40, 17T/40], wherein Tmp is a multiple pulse time, dTtop is a first pulse lead-time, and T is a clock period,
- an adjusting unit (530) for adjusting ε to adapt to a jitter value according to the value of Pwind, and
- a generating unit (540) for generating an optimized write power Pw based on the jitter value and the adjusted ε.
8. An apparatus as claimed in claim 7, wherein the selecting unit (520) is further used to select a Tera and a Ttop according to the selected Tmp and dTtop, wherein Tera is an erase lead-time and Ttop is a first pulse time.
9. An apparatus as claimed in claim 7, wherein the generating unit (540) is also used to check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in a standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive; if the margin of the optimized Pw margin is not smaller than the predefined margin threshold, output the Pw.
10. An apparatus as claimed in claim 7, wherein the generating unit (540) is also used to check whether the margin of the optimized Pw is not smaller than a margin threshold predefined in a standardized format specification of the rewritable optical disc or a standardized format specification of a corresponding drive; if the margin of the optimized Pw is smaller than the predefined margin threshold, return to the selecting unit (520) to select another pair of Tmp and dTtop.
11. A recorder for writing data on a rewritable optical disc, said recorder comprising an apparatus as claimed in claim 7.
PCT/IB2007/052482 2006-06-30 2007-06-27 A method and apparatus of optimizing write parameters for a rewritable optical disc WO2008001314A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1431966A2 (en) * 2002-12-18 2004-06-23 Ricoh Company Optical recording method
JP2004199756A (en) * 2002-12-17 2004-07-15 Ricoh Co Ltd Information recording/reproducing method
EP1659576A1 (en) * 2003-08-27 2006-05-24 Ricoh Company, Ltd. Phase-change optical recording medium, optical recoding method, and optical recorder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004199756A (en) * 2002-12-17 2004-07-15 Ricoh Co Ltd Information recording/reproducing method
EP1431966A2 (en) * 2002-12-18 2004-06-23 Ricoh Company Optical recording method
EP1659576A1 (en) * 2003-08-27 2006-05-24 Ricoh Company, Ltd. Phase-change optical recording medium, optical recoding method, and optical recorder

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