CN101567208B - Multilevel realization method of short run-length record operator edge modulation - Google Patents
Multilevel realization method of short run-length record operator edge modulation Download PDFInfo
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- CN101567208B CN101567208B CN2009100524788A CN200910052478A CN101567208B CN 101567208 B CN101567208 B CN 101567208B CN 2009100524788 A CN2009100524788 A CN 2009100524788A CN 200910052478 A CN200910052478 A CN 200910052478A CN 101567208 B CN101567208 B CN 101567208B
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Abstract
The invention discloses a multilevel realization method of short run-length recording mark edge modulation of a multilevel red disc with a channel spacing which is more than or equal to 0.52 micron. The method comprises the steps as follows: A. determining level numbers of the short run-length recording marks according to corresponding relationship of a corresponding table of multilevel disk modulation coding run-length level; B. determining change numbers and values of parameters T1 and T2 of a write strategy vector according to the level numbers of the short run-length recording marks, wherein the write strategy vector W is equal to [T1T2], the parameter T1 is used for controlling the position of the left edge of the short run-length recording marks, and the parameter T2 is used for controlling the position of the right edge of the short run-length recording marks; C. utilizing the write strategy vector to control the power of a laser recorder to write and realize the short run-length recording marks; and D. identifying levels of recording marks according to the change of the position of the short run-length recording mark edge. The realization method changes microstructures of the recording marks according to the change of the position of the short run-length recording mark edge, and realizes multilevel of the short run-length recording marks, thus increasing the red digital disc storage capacity.
Description
Technical field
The present invention relates to the digital storage technique field, particularly relate to a kind of track pitch that is used for and modulate multistage implementation method more than or equal to the short run-length recording symbol fringe of 0.52 micron multistage ruddiness CD.
Background technology
Traditional digital light storage products is (as CD (Compact Disc, CD), DVD (Digital Versatile Disc, digital versatile disc), BD (Blue-ray Disc, ruddiness CD)) all be to convert numerical information to represent binary data with 0 or 1.Utilize the switch of the binary data control stamper laser recorder after changing, to form the hole (pit) and the bank (land) of recording layer, the record symbol of each run length has only hole or bank two states.
Can realize that the recording status of the distance of swimming is more than 2 by the micromechanism that changes the record symbol, thereby improve the memory capacity of recording density and optical digital disk, this by changing the method that record symbol micromechanism promotes the run-length recording status number, be called multistage digital storage technique.If the recording status number of each distance of swimming is M (M＞2), the memory capacity of then multistage stored digital CD will improve log2M doubly.Therefore, realize multistage storage mode, can improve the memory capacity of stored digital CD by changing record symbol micromechanism.And the compatibility of multistage digital light memory technology and existing digital light memory technology better.
Yet in realizing process of the present invention, the inventor finds because the run length difference of each length records symbol, therefore the maximum order number of times difference that can realize.Therefore, short-run record character can not equally with long run-length recording symbol be realized same order number.
In addition, because the nargin of short-run record character is less, if adopt same record symbol micromechanism to shift gears with the long distance of swimming, then attainable order number can be considerably less or may not be realized recording status more than 2.It is multistage to take following mode to realize such as the long distance of swimming: the mode of the sub-bank that insertion position and size all change in record pit realizes the multistage of long distance of swimming hole; The mode in the son hole that insertion position and size all change in the record bank realizes the multistage of long run-length recording bank.Because the length of short-run record character is less, may be at inner son hole or the sub-bank of inserting of record symbol, the variation of son hole (sub-bank) size and position just more can't realize certainly.So it is multistage that the short distance of swimming can not equally with the long distance of swimming realize, thereby cause the memory capacity of optical digital disk lower.
Summary of the invention
The problem to be solved in the present invention provides a kind of track pitch that is used for and modulates multistage implementation method more than or equal to the short run-length recording symbol fringe of 0.52 micron multistage ruddiness CD, to overcome in the prior art owing to the short distance of swimming can not equally with the long distance of swimming realize the multistage lower defective of memory capacity that causes the ruddiness optical digital disk.
For achieving the above object, technical scheme of the present invention provides a kind of track pitch that is used for to modulate multistage implementation method more than or equal to the short run-length recording symbol fringe of 0.52 micron multistage ruddiness CD, said method comprising the steps of: A, according to the corresponding relation of the corresponding code table of multi-stage optical disk modulating-coding distance of swimming sublevel, determine the sublevel number of short-run record character; B, determine to write the parameter T of policy vector according to the sublevel number of described short-run record character
1And T
2Change frequency and numerical value; Wherein, write policy vector
Parameter T
1Be used to control the position of short-run record character left margin, parameter T
2Be used to control the position on edge, short-run record character the right; The power that policy vector control laser recorder is write in C, utilization carries out the imprinting and the realization of short-run record character; D, the order identification of writing down symbol according to the change in location of short run-length recording symbol fringe.
Wherein, the position of described recording symbol fringe by regulating the size of described laser power time delay, forms the variation of recording symbol fringe position by the time delay decision of mother CD burning laser power, realizes the multistage of short-run record character.
Wherein, in step C, specifically comprise: according to the size of the power time delay of writing policy vector control mother CD burning laser instrument, to form the variation of short run-length recording symbol fringe position, realize the multistage of short-run record character, the described concrete parameter value of policy vector of writing is determined by the multistage order number of short-run record character.
Wherein, in step D, specifically comprise:, determine that the amplitude of read output signal changes according to the change in location of short run-length recording symbol fringe; According to the variation of described read output signal amplitude, carry out the identification of short-run record character order.
Wherein, before steps A, also comprise: binary user data is carried out Error Correction of Coding and modulating-coding, form distance of swimming sequence and order sequence.
Wherein, after forming distance of swimming sequence and order sequence, also comprise:, write the selection of policy vector according to described distance of swimming sequence and order sequence.
Wherein, the described step of writing the selection of policy vector specifically comprises: determine T according to described distance of swimming sequence
1, T
2Base value; Determine T according to described order sequence
1, T
2Concrete variation realize the multistage of short-run record character.
Compared with prior art, technical scheme of the present invention has following advantage:
The present invention is according to the change in location of short run-length recording symbol fringe, changes record symbol micromechanism, realizes track pitch multistage more than or equal to the short-run record character of 0.52 micron multistage ruddiness CD, thereby increases the memory capacity of ruddiness optical digital disk.
Description of drawings
Fig. 1 modulates the process flow diagram of multistage implementation method for a kind of track pitch that is used for of the embodiment of the invention more than or equal to the short run-length recording symbol fringe of 0.52 micron multistage ruddiness CD;
Fig. 2 is that the 2T record symbol and the multistage back 2T of the original length of the embodiment of the invention writes down the forming process synoptic diagram that accords with;
Fig. 3 a is track pitch accords with (2T) more than or equal to the multistage record of the short distance of swimming of 0.52 micron multistage ruddiness CD the macroscopic features synoptic diagram that is used for of the embodiment of the invention;
Fig. 3 b is track pitch accords with (2T) more than or equal to the multistage record of the short distance of swimming of 0.52 micron multistage ruddiness CD the downward projection figure that is used among Fig. 3 a;
Fig. 4 reaches the synoptic diagram that influences that adjacent record is accorded with read output signal for the track pitch that is used for of the embodiment of the invention more than or equal to the multistage record symbol of the short distance of swimming of 0.52 micron multistage ruddiness CD (2T) read output signal.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
A kind of track pitch that is used for of the embodiment of the invention is modulated multistage implementation method as shown in Figure 1 more than or equal to the short run-length recording symbol fringe of 0.52 micron multistage ruddiness CD, the microstructure of the short-run record character of multi-stage optical disk has multiple recording mode, utilizes the variation of position, edge, the short-run record character left and right sides to characterize the multistage of short-run record character in the present embodiment.In the short run-length recording symbol fringe modulation is multistage, the variation that characterizes the position, edge of short-run record character order is determined by the size that stamper laser recorder power time delay changes, and the variation of stamper note device record laser power time delay is determined by writing the policy vector parameter.The number of times of the change in location at the record symbol edge, the left and right sides of different rank is determined that by the modulating-coding code table size of the change in location at the record symbol edge, the left and right sides of different rank is determined by writing the policy vector parameter.With reference to Fig. 1, present embodiment may further comprise the steps:
Step s101 carries out Error Correction of Coding and modulating-coding to binary user data, forms distance of swimming sequence RS and order sequence LS.Element in the distance of swimming sequence (RSi) is used for the run length of controlling recording symbol, and corresponding order data sequence element (LSi) is used for the changes of microstructure of controlling recording symbol, thereby realizes the order of record symbol.RSi and LSi are used to write the selection of policy vector.RSi determines T
1, T
2Base value, such as RSi=2, T then
1=T
2=1; If RSi=3, then T
1=T
2=1.5, LSi determines T
1, T
2Concrete variation realize the multistage of short-run record character.Such as LSi=1, T then
1=T
2=1-Δ T; LSi=2, then T
1=T
2=1+ Δ T; Write policy vector parameter T
1, T
2The power time delay that is used for the controlling recording device, thus the microstructure change of formation short-run record character realizes the multistage of short-run record character.
Step s102 according to the corresponding relation of multi-stage optical disk modulating-coding distance of swimming sublevel corresponding tables, determines the sublevel number of short-run record character.The corresponding relation of the distance of swimming sublevel corresponding tables of a kind of multi-stage optical disk modulating-coding of present embodiment is as shown in table 1: (please replenish the modulating-coding code table)
Table 1 distance of swimming sublevel corresponding tables
| The distance of swimming | 2T | 3T | 4T | 5T | 6T | 7T | 8T | 9T | 10T |
| Order | 2 | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 7 |
Step s103 determines to write the parameter T of policy vector according to the sublevel number of short-run record character
1And T
2Change frequency and numerical value; Wherein, write policy vector
Parameter T
1Be used to control the position of short-run record character left margin, parameter T
2Be used to control the position on edge, short-run record character the right.
Step s104 utilizes the power of writing policy vector control laser recorder to carry out the imprinting and the realization of short-run record character.The position of described recording symbol fringe is by the time delay decision of mother CD burning laser power, size according to the power time delay of writing policy vector control mother CD burning laser instrument, to form the change in location of short run-length recording symbol fringe, realize the multistage of short-run record character, the described concrete parameter value of policy vector of writing is determined by the multistage order number of short-run record character.
Step s105, the order identification of writing down symbol according to the change in location of short run-length recording symbol fringe.Specifically comprise:, determine that the amplitude of read output signal changes according to the change in location of short run-length recording symbol fringe; According to the variation of described read output signal amplitude, carry out the identification of short-run record character order.The position, edge, the left and right sides of the multistage record symbol of the short distance of swimming of present embodiment changes simultaneously, is in the record symbol that different orders are represented in different positions, and its read output signal amplitude also can produce corresponding variation.After the edge change in location, the length of short-run record character is long more, and the amplitude of read output signal is big more; Opposite length is more little, and the read output signal amplitude is more little.
Below in conjunction with specific embodiment, the present invention is described in detail.Present embodiment is that example describes with 2T, but 3T, and the multistage implementation of 4T... recording symbol fringe modulation also is a protection content of the present invention.Present embodiment is 2 to be that example describes with the branch exponent number of 2T, but 2T, 3T, the order number of 4T... recording symbol fringe modulation also is a protection content of the present invention greater than 2 situation.
In the tradition two-value recording disk product, the length of short-run record character is one and determines constant value, therefore can only realize hole and two kinds of recording status of bank.In the multistage system of present embodiment, for memory capacity and the recording density that improves CD, the short distance of swimming also is used to carry out multistage, and in order to improve the discrimination between the multistage record symbol of the short distance of swimming, present embodiment utilizes short run-length recording symbol fringe position modulation mode to realize multistage, short-run record character comprises 2T, 3T, 4T... etc.
For the short-run record character of 2T, its sublevel number is 2, and it writes the policy vector parameter
Middle T
1, T
2Base value select 1.For realizing its sublevel situation, to parameter T
1, T
2Value changes, thereby realizes the variation of 2T recording symbol fringe position.Fig. 2 has provided the 2T record symbol of original length, and the forming process of multistage back 2T record symbol.2T
1The policy vector of writing on rank is adjusted into
Promptly form 2T
1The left and right sides pulse edge of the impulse time delay of rank record symbol laser recorder all inwardly shortens T/6, and the corresponding T/6 that outwards increases of the right pulse edge that previous adjacent record accords with, the corresponding outside increase T/6 of left pulse edge of a back adjacent record symbol.The 2T that forms
1Rank record symbol as shown in Figure 2.
2T
2The forming process of rank record symbol is: adjust and write the policy vector parameter
Promptly form 2T
2The left and right sides pulse edge of the impulse time delay of rank record symbol laser recorder all outwards increases T/6, and the corresponding T/6 that inwardly shortens of the right pulse edge that previous adjacent record accords with, the corresponding inside shortening T/6 of left pulse edge of a back adjacent record symbol.The 2T that forms
2Rank record symbol as shown in Figure 2.Can realize more multistage time by the occurrence that the policy vector parameter is write in adjustment.
Laser recorder obtains adopting the multistage record symbol of the short distance of swimming of edge position modulation after carrying out photoetching, exposure and development on the recording materials macroscopic features as shown in Figure 3.Fig. 3 has characterized 2T respectively
1Rank, 2T
2The record pit type on rank.Fig. 3 has characterized the edge change in location of 2T record symbol.
The read output signal amplitude of the multistage record symbol of the short distance of swimming changes the order that characterizes the record symbol.Fig. 4 has represented multistage record symbol (2T) read output signal of the short distance of swimming and adjacent record has been accorded with the influence of read output signal.As shown in Figure 4, because 2T
1The edge, the left and right sides of rank record symbol inwardly shortens T/6, and therefore, the right of previous adjacent record symbol is along outwards increasing T/6, and the left margin of a back adjacent record symbol outwards increases T/6, so 2T
1The read output signal amplitude of rank record symbol diminishes than the amplitude of original 2T length records symbol.Adjacent record symbol is near 2T
1The read output signal amplitude of exponent part increases.Because 2T
2The edge, the left and right sides of rank record symbol outwards increases T/6, and the right of therefore previous adjacent record symbol is along inwardly shortening T/6, and the left margin of a back adjacent record symbol inwardly shortens T/6, so 2T
2The read output signal amplitude of rank record symbol becomes big than the amplitude of original 2T length records symbol.Adjacent record symbol is near 2T
2The read output signal amplitude of exponent part reduces.
Present embodiment is according to the change in location of short run-length recording symbol fringe, change record symbol micromechanism, the realization track pitch is multistage more than or equal to 0.52 micron multistage ruddiness CD short-run record character, thereby increase the memory capacity of ruddiness optical digital disk, improved discrimination between the different order short-run record character read output signals simultaneously.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the memory storage and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.Should be understood that the variation in these concrete enforcements is conspicuous for a person skilled in the art, do not break away from spiritual protection domain of the present invention.
In addition, those skilled in the art are to be understood that, when the present invention is used to make red light multi-level optical storage device, track pitch can be defined as corresponding to the employed optical maser wavelength of imprinting CDs, for example, usually more than or equal to 0.52 micron, also can be defined as, for example more than or equal to 0.75 micron or 0.8 micron more than or equal to 0.7 micron or higher.But the present invention is not limited thereto, and the short run-length recording symbol fringe of the present invention's design is modulated the track pitch that multistage implementation method is not limited to red light multi-level optical storage device.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. one kind is used for track pitch and modulates multistage implementation method more than or equal to the short run-length recording symbol fringe of 0.52 micron multistage ruddiness CD, it is characterized in that, said method comprising the steps of:
A, according to the corresponding relation of the corresponding code table of multi-stage optical disk modulating-coding distance of swimming sublevel, determine the sublevel number of short-run record character;
B, determine to write the parameter T of policy vector according to the sublevel number of described short-run record character
1And T
2Change frequency and numerical value; Wherein, write policy vector
Parameter T
1Be used to control the position of short-run record character left margin, parameter T
2Be used to control the position on edge, short-run record character the right;
Distance of swimming sequence is 2, described sublevel number is 2 o'clock, writes the policy vector parameter
Middle T
1, T
2Base value 1, write policy vector and be adjusted into
Wherein, parameter T is the original length of described short-run record character;
The power that policy vector control laser recorder is write in C, utilization carries out the imprinting and the realization of short-run record character;
D, the order identification of writing down symbol according to the change in location of short run-length recording symbol fringe.
2. short run-length recording symbol fringe as claimed in claim 1 is modulated multistage implementation method, it is characterized in that, the position of described recording symbol fringe is by the time delay decision of mother CD burning laser power, by regulating the size of described laser power time delay, form the variation of recording symbol fringe position, realize the multistage of short-run record character.
3. short run-length recording symbol fringe as claimed in claim 1 or 2 is modulated multistage implementation method, it is characterized in that, in step C, specifically comprise: according to the size of the power time delay of writing policy vector control mother CD burning laser instrument, to form the variation of short run-length recording symbol fringe position, realize the multistage of short-run record character, the described concrete parameter value of policy vector of writing is determined by the multistage order number of short-run record character.
4. short run-length recording symbol fringe as claimed in claim 1 is modulated multistage implementation method, it is characterized in that, in step D, specifically comprises:
According to the change in location of short run-length recording symbol fringe, determine that the amplitude of read output signal changes;
According to the variation of described read output signal amplitude, carry out the identification of short-run record character order.
5. short run-length recording symbol fringe as claimed in claim 1 is modulated multistage implementation method, it is characterized in that, before steps A, also comprises: binary user data is carried out Error Correction of Coding and modulating-coding, form distance of swimming sequence and order sequence.
6. short run-length recording symbol fringe as claimed in claim 5 is modulated multistage implementation method, it is characterized in that, after forming distance of swimming sequence and order sequence, also comprises: according to described distance of swimming sequence and order sequence, write the selection of policy vector.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1197962A2 (en) * | 2000-10-10 | 2002-04-17 | TDK Corporation | Optical recording medium and method |
| CN1553450A (en) * | 2003-12-19 | 2004-12-08 | 清华大学 | Range length limited encodig input method for photocoloring multiple gradient optical memory |
| CN1687991A (en) * | 2005-03-25 | 2005-10-26 | 清华大学 | Multi-order recordable CD of run-length limiting and making method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1197962A2 (en) * | 2000-10-10 | 2002-04-17 | TDK Corporation | Optical recording medium and method |
| CN1553450A (en) * | 2003-12-19 | 2004-12-08 | 清华大学 | Range length limited encodig input method for photocoloring multiple gradient optical memory |
| CN1687991A (en) * | 2005-03-25 | 2005-10-26 | 清华大学 | Multi-order recordable CD of run-length limiting and making method thereof |
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