CN1448920A - Method for correcting optimum writing capability of CD - Google Patents
Method for correcting optimum writing capability of CD Download PDFInfo
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- CN1448920A CN1448920A CN 02105480 CN02105480A CN1448920A CN 1448920 A CN1448920 A CN 1448920A CN 02105480 CN02105480 CN 02105480 CN 02105480 A CN02105480 A CN 02105480A CN 1448920 A CN1448920 A CN 1448920A
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Abstract
The present invention provides the optimal power correcting method for CD in optical system. The CD is provided with one power correcting area, and the power correcting area has one counting area and one test area with several test intervals. The correcting method includes producing successively several first power levels, several second power levels, several corresponding first parameters, pre-estimated optimal power, several third power levels and several corresponding second parameters based on one power index; and producing one optimal power based on the pre-estimated optimal power, these first parameters and these second parameters.
Description
Technical field
The invention provides a kind of CD-RW discsCD-RW and write the bearing calibration of record power, refer to a kind of bearing calibration that is used for the optimum writing capability of optical system CD-RW discsCD-RW especially.
Background technology
The numerical data use amount along with a large amount of uses of computer, also has the trend of rising.By the use of compact disc burning device, duplicative CD-RW discsCD-RW (CD-RW) is exactly a kind of storing media very easily.The compact disc burning device is to utilize laser that data are write in record to a CD-RW discsCD-RW.It is a very exquisite process that data are write in the CD-RW discsCD-RW, in writing the process of data, needs to drop into great mental and physical efforts and suffers damage to prevent CD-RW discsCD-RW.In order to ensure the quality that is stored in data in the CD-RW discsCD-RW, many kinds of capability correction methods all are used to the power of calibration of laser, record to CD-RW discsCD-RW so that data are correctly write.
Please refer to Fig. 1, but Fig. 1 is the synoptic diagram of known write-once type CD-RW discsCD-RW (CD-R) 10.For the clearer CD-RW discsCD-RW 10 that presents, Fig. 1 only presents the CD-RW discsCD-RW of quarter-wave plate.But write-once type CD-RW discsCD-RW 10 comprises a center pit 12, one capability correction district (power calibration area) 14, one nondeclarative memory district (program memory area) 16, one introduces district (lead-in area) 18, one program area (programarea) 20 is with a draw-out area (lead-out area) 22.Capability correction district 14 comprises a count block and a test section.The count block includes a plurality of counting units, and the test section then includes between a plurality of test sections corresponding to each counting unit.The compact disc burning device just utilizes in the program of capability correction between these test sections writes test data record between the test section.
Please refer to Fig. 2 and Fig. 3.Fig. 2 is the process flow diagram of known method in order to calibrating optical power.The synoptic diagram of employed measured power of Fig. 3 displayed map 2 methods and best power 46.In the known technology, but the compact disc burning device is from the introducing district 18 of write-once type CD-RW discsCD-RW 10 or read an index power 40 (indicated power) from the firmware database of compact disc burning device, try to achieve a best power 46 subsequently and according to index power 40, then make cd-rom recorder send laser and record to CD-RW discsCD-RW 10 so that data are write with best power 46.The step of known technology corrected output is as follows:
Step 30: introduce district 18 certainly and read index performance number 40;
Step 32: obtain 15 power ranks that are evenly distributed between 1.3* (index power) 42 and 0.7* (index power) 44, and with these 15 power ranks test data is write to record to the CD-RW discsCD-RW 10 and write the record program to finish a test;
Step 34: assess above-mentioned 15 power ranks and write the record result, according to the result who writes record and transport the interpolation method and process of heterodyning is obtained best power 46.
As shown in Figure 3, these 15 other index values of power level are between 0 to 14, and are evenly distributed in 42 of 0.7* (index power) 44 and 1.3* (index power).For instance, to represent the power of laser be 0.7* (index power) 44 to index value 0; It is 1.3* (index power) 42 that index value 14 is represented the power of laser; And index value 7 to represent the power of laser be exactly index performance number 40.This compact disc burning device is write the record test according to these 15 power ranks, to find out the position at best power 46 places.When the action that writes CD-RW discsCD-RW is during according to best power 46 operation, high frequency and the high-frequency signals HF with ideal symmetrical amplitude produce thereupon.General high-frequency signals has first amplitude (upper amplitude) A1 greater than zero the time, and having second amplitude (loweramplitude) A2 less than zero the time, amplitude measurement parameters β=(A1-A2)/(A1+A2) be is used for the relative size of comparison A1 and A2.When first amplitude A 1 of high-frequency signals HF just in time equals its second amplitude A 2 (that is β=0), then find the best power 46 of laser.
With Fig. 3 is example, supposes that best power 46 is between the laser power of the laser power of index value 8 and index value 9.The compact disc burning device just writes test data with these 15 power ranks.When the laser power with index value 8 write test data, second amplitude A 2 of high-frequency signals can be greater than its corresponding first amplitude A 1 (that is β＜0).On the other hand, when index of reference value 9 laser powers write test data, first amplitude A 1 of high-frequency signals can be greater than its corresponding second amplitude A 2 (that is β＞0).Therefore, write test result by analyzing these two, it is between the laser power of the laser power of index value 8 and index value 9 that the compact disc burning device just can calculate best power.Also can utilize the interpolation method to find out laser power when β=0 accurately to obtain best power 46.
Whenever utilizing known bearing calibration when obtaining best power 46, all need write test data with 15 power ranks.Yet CD-RW discsCD-RW 10 is damaged by high power laser light in writing the process of test data possibly.For example, suppose best power 46 far below index power 40, write surface that test data just might damage CD-RW discsCD-RW 10 as if the laser power with index value 15 this moment, because the laser power of index value 15 surpasses the scope that CD-RW discsCD-RW 10 can bear.This example shows, in the process of capability correction, even also has not the ghost of a chance data are write at the compact disc burning device and records to the program area 20 of CD-RW discsCD-RW 10 CD-RW discsCD-RW 10 and just damaged.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of best power correction method that is used for the CD-RW discsCD-RW of optical system, to solve the above problems.
CD-RW discsCD-RW is provided with a capability correction zone among the present invention, be provided with a count block and a test section in this capability correction zone, be provided with a plurality of counting units in this count block, be provided with (testblock) between a plurality of test sections in this test section, corresponding to a counting unit, be to be used for writing the record test data between each test section between each test section.This method includes according to an index power and produces a plurality of first power ranks; Select a plurality of second power ranks in these first power ranks; According to these second power ranks, test data is write record between these test sections; Data in reading between this test section are to produce corresponding data signals and former first parameter of a plurality of correspondence; Produce a best power of estimating with a default algorithm; Produce a plurality of the 3rd power ranks according to this best power of estimating; According to these the 3rd power ranks, test data is write record between these test sections; Data in reading between this test section are to produce corresponding data signals and second parameter of a plurality of correspondences; According to this best power of estimating, these first parameters and these second parameter generating, one best powers.
The invention has the advantages that best power correction method is to utilize the second power rank that test data is write record between the test section,, therefore can avoid testing laser to produce excessive power and damage CD-RW discsCD-RW because the second power rank is lower than index power rank.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
But Fig. 1 is the synoptic diagram of known write-once type CD-RW discsCD-RW.
Fig. 2 is the process flow diagram of known best power correction method.
The synoptic diagram of employed measured power of Fig. 3 displayed map 2 methods and best power.
Fig. 4 is the process flow diagram of best power correction method of the present invention.
The synoptic diagram of Fig. 5 and employed measured power of Fig. 6 displayed map four methods and best power.
Embodiment
Best power correction method of the present invention provides the compact disc burning device a kind of method that is better than the known power correction.The CD-RW discsCD-RW of introducing in background of invention is applicable in the present embodiment, similarly so repeat no more in this.
In the present embodiment, the compact disc burning device at first must be from introducing district 18 (lead-inarea) reading of data in the CD-RW discsCD-RW 10, index power then is to read in the firmware database that is stored in the compact disc burning device, and the compact disc burning device produces a plurality of moderate measured power ranks immediately.In order to prevent that CD-RW discsCD-RW 10 from suffering damage because of too high laser power, the present invention utilizes an Improvement type best power correction method to prevent that CD-RW discsCD-RW is damaged.
Please refer to Fig. 4 to Fig. 6.Fig. 4 is the process flow diagram of best power correction method of the present invention.The synoptic diagram of Fig. 5 and employed measured power of Fig. 6 displayed map 4 methods and best power.As known correction method, best power correction method of the present invention is also used 15 power ranks when writing test data, so that try to achieve best power 96.Yet correction method of the present invention is not to carry out this 15 tests simultaneously.On the contrary, only utilize the in advance test of N lower power level, see whether best power 96 is positioned at this narrower scope.The step of best power correction method of the present invention show as after.
Step 50: introduce district 18 certainly and read index power (indicated power) 80;
Step 52: obtain 15 power ranks that are evenly distributed between 1.3* (index power) 82 and 0.7* (index power) 84, and choose N lower power level, finish a test and write the record program;
Step 54: assess above-mentioned 15 power ranks and write the record result, according to the result who writes record and use interpolation method and process of heterodyning to try to achieve a best power (estimated optimal power) 86 of estimating;
Step 56: utilize remaining 15-N power rank to contain the best power 94 of 0.8* estimation and the best power 92 of 1.2* estimation; And utilize these remaining 15-N power rank to finish test and write the record program;
Step 58: assess a remaining 15-N power level and else write the record performance;
Step 60: judge whether best power 96 drops in best power 92 scopes that best power 94 that 0.8* estimates and 1.2* estimate, if carry out step 62; If not, then carry out step 64;
Step 62: be used as Writing power with best power 96 and data write in the planning region of recording to the CD-RW discsCD-RW 10 20;
Step 64: judge whether this best power 96 is higher than the best power 92 that 1.3* estimates, if carry out step 66; If not, carry out step 68;
Step 66: reduce the minimum measured power value that writes, 0.7* index power 84 just, and the power rank that this reduced is set at new index power, carry out step 52;
Step 68: increase the highest measured power value that writes, 1.3* index power 82 just, and the power rank that this increased is set at new index power, carry out step 52.
For energy above-mentioned process flow diagram more than you know, just be used as the best power correction method that example illustrates the present invention with figure five and figure six.As shown in Figure 5, when from the introducing district 18 of CD-RW discsCD-RW 10 or when reading an index power 80 from the firmware database of compact disc burning device, 15 produce with the power ranks of 1.3* (index power) 82 immediately between 0.7* (index power) 84.In the middle of these 15 power ranks, choose N lower power level and finish test and write the action of data to CD-RW discsCD-RW 10.In Fig. 5, N=4.For the purpose of insurance more, 4 selected power ranks necessarily all will be lower than index power 80, so just can guarantee when testing when writing data to CD-RW discsCD-RW the unlikely too high and damage CD-RW discsCD-RW 10 of laser power.
Next step writes data between the test section that is arranged in capability correction district 14 with these 4 lower power level.Identical with known method, all can corresponding measure a β value between each test section, according to these β values that occurs first, just can try to achieve the best power 86 of estimation again by interpolation method or process of heterodyning.
As shown in Figure 6, form the afterpower rank group of the best power 92 that a best power 94 of estimating between 0.8* and 1.2* estimate with the best power of estimating 86.Because 4 in 15 power ranks were before tested, this afterpower group only comprises 11 power ranks, from index value 0B to index value 10B.Next, data are write record between the test section that is arranged in capability correction district 14, and calculate each β value simultaneously with these remaining power ranks.Same according to these β values that occurs for the second time, just can try to achieve best power 96 by interpolation method or process of heterodyning again.
Shown in the step 60 in Fig. 4 process flow diagram,, then can adjust index power 80 synchronously if best power 96 does not drop in the scope of the best power 94 of 0.8* estimation and the best power 92 that 1.2* estimates.For instance, if best power 96 greater than the best power 92 that 1.2* estimates, resets index power so is the littler value of a best power of estimating than 0.8* 94.More after the New Set power, the best power correction program is got back to step 52 again at overline, and index power at this moment is an index power that was updated.
Shown in the step 62 in Fig. 4 process flow diagram, if best power 96 drops in the scope of the best power 94 of 0.8* estimation and the best power 92 that 1.2* estimates just at the right time, the best power correction program just is through with, and just according to best power 96 data is write and recorded to the program area 20 of CD-RW discsCD-RW 10.
Best power correction method of the present invention is not only applicable to the capability correction of readable formula CD-RW discsCD-RW, other any kind of laser discs, and for example: CD-RW, DVD-R, DVD-RW, DVD+RW or the like also are suitable for.With known art, best power correction method of the present invention adopts two stage test processs to decide best power when writing disk.Its Alpha test process is utilized N the power rank also lower than index power.Because only utilize the power rank be lower than index power, so that CD-RW discsCD-RW is subjected to the chance that high power laser light damages is very little.What is more, the result of Alpha test process more can import subordinate phase in the hope of an accurate optimum power value.Therefore, the invention provides a kind of process that safety and method are accurately finished optical power calibrating that has concurrently.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (17)
1. best power correction method that is used for the CD-RW discsCD-RW of an optical system, this CD-RW discsCD-RW is provided with a capability correction zone, is provided with a count block and a test section in this capability correction zone; Being provided with a plurality of counting units in this count block, being provided with in this test section between a plurality of test sections, corresponding to a counting unit, is to be used for writing the record test data between each test section between each test section; This method includes:
Produce a plurality of first power ranks according to an index power;
In these first power ranks, select a plurality of second power ranks;
According to these second power ranks, test data is write record between these test sections;
Data in reading between this test section are to produce corresponding data signals and first parameter of a plurality of correspondences;
Produce a best power of estimating with a default algorithm;
Produce a plurality of the 3rd power ranks according to this best power of estimating;
According to these the 3rd power ranks, test data is write record between these test sections;
Data in reading between this test section are to produce corresponding data signals and second parameter of a plurality of correspondences;
According to this best power of estimating, these first parameters and these second parameter generating, one best powers.
2. the method for claim 1 is characterized in that, the power of these second power rank correspondences is less than this index power.
3. the method for claim 1 is characterized in that, this index power train is stored in one of this CD-RW discsCD-RW and introduces the district, and this method includes in addition: read this index power by this introducing district.
4. the method for claim 1 is characterized in that, this index power is stored in the firmware database of a compact disc burning device, and this method includes in addition: by reading this index power in this firmware database.
5. the method for claim 1 is characterized in that, this algorithm can be calculated the result of these second power rank interpolations.
6. the method for claim 1 is characterized in that, this algorithm can be calculated the result of these second power rank heterodynes.
7. method as claimed in claim 6 is characterized in that, these first parameters and these second system of parameters calculate according to the amplitude of corresponding data signal.
8. the method for claim 1, it is characterized in that, also include: if the power rank of this best power does not meet a preferable best power rank, then adjust the power rank of this best power, and according to this this index power of adjusted power grade renewal.
9. method as claimed in claim 8 is characterized in that, when adjusting the power rank of this best power, is that power rank minimum in the 3rd power rank is reduced.
10. method as claimed in claim 8 is characterized in that, when adjusting the power rank of this best power, is that power rank the highest in the 3rd power rank is raise.
11. the method for claim 1 is characterized in that, record employed power during a program area to this CD-RW discsCD-RW is write with data by this best power system.
12. the method for claim 1 is characterized in that, this CD-RW discsCD-RW is a CD-R CD-RW discsCD-RW.
13. the method for claim 1 is characterized in that, this CD-RW discsCD-RW is a DVD-R CD-RW discsCD-RW.
14. the method for claim 1 is characterized in that, this CD-RW discsCD-RW is erasable.
15. the method for claim 1 is characterized in that, this CD-RW discsCD-RW is a CD-RW CD-RW discsCD-RW.
16. the method for claim 1 is characterized in that, this CD-RW discsCD-RW is a DVD-RW CD-RW discsCD-RW.
17. the method for claim 1 is characterized in that, this CD-RW discsCD-RW is a DVD+RW CD-RW discsCD-RW.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02105480 CN1227654C (en) | 2002-04-02 | 2002-04-02 | Method for correcting optimum writing capability of CD |
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|---|---|---|---|
| CN 02105480 CN1227654C (en) | 2002-04-02 | 2002-04-02 | Method for correcting optimum writing capability of CD |
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| CN1448920A true CN1448920A (en) | 2003-10-15 |
| CN1227654C CN1227654C (en) | 2005-11-16 |
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| CN 02105480 Expired - Fee Related CN1227654C (en) | 2002-04-02 | 2002-04-02 | Method for correcting optimum writing capability of CD |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306492C (en) * | 2004-01-30 | 2007-03-21 | 三洋电机株式会社 | Optical recording and reproducing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7920447B2 (en) | 2007-06-13 | 2011-04-05 | Mediatek Inc. | Method and system for calibrating an optimized power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306492C (en) * | 2004-01-30 | 2007-03-21 | 三洋电机株式会社 | Optical recording and reproducing apparatus |
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