CN100411050C - Data error correcting unit and method thereof - Google Patents
Data error correcting unit and method thereof Download PDFInfo
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- CN100411050C CN100411050C CNB2004100890974A CN200410089097A CN100411050C CN 100411050 C CN100411050 C CN 100411050C CN B2004100890974 A CNB2004100890974 A CN B2004100890974A CN 200410089097 A CN200410089097 A CN 200410089097A CN 100411050 C CN100411050 C CN 100411050C
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Abstract
The present invention relates to a data error correcting unit and a method thereof, more specifically a device and the method thereof for correcting generant data errors when an optical storage medium is used for reading information. The data error correcting unit according to the present invention has the characteristics composed of the following parts of a preprocessing part, a data memory, an error correcting unit and an error detecting unit, wherein the preprocessing part is used for reading and decoding BCA codes; the data memory comprises error correcting cells; the data errors are corrected according to the units of the error correcting cells; when at least two error correcting cells which can not correct the errors exist, the error correcting unit is used for selectively correcting the errors for the error correcting cells which can not correct the errors; the error detecting unit is used for judging whether or not the errors exist in the BCA codes.
Description
[technical field]
The invention relates to data error correcting unit and method thereof.Specifically, the devices and methods therefor of revising about the error in data that optical storage medium is produced when reading information.
[background technology]
Recently, increasing people is at bootlegging and the similar piracy of taking measures to make great efforts to prevent software.Particularly, more urgent the literary property of the information on being stored in optical storage medium.Because it is very easy to be stored in duplicating of information on the optical storage medium, thus now many people researching and developing can be easily from the optical storage medium the device and method of Copy Info.
As a ring that prevents this situation, look the standard of optical storage medium and take burning district (Burst Cutting Area is hereinafter to be referred as the BCA) coding of the storage data different with the generic storage mode.
As shown in Figure 1, BCA coding is positioned at the inboard of the Lead-In Area of disk, and it begins to be radial being stored on the disk with the form of bar code from the center of disk.When being recorded in after content on the disk all is stored, it again with the form of appending with data storage.
Above-mentioned BCA coding through phase encoding (phase encording) afterwards, it is representing the part of " 1 " in each bit after RZ conversion (Return to Zero modualtion).
Above-mentioned BCA coding is made of preamble information district (Preambl e field), data field (date field) and synchronizing information district, back (postamble).Above-mentioned each zone is connected by structure as shown in Figures 2 and 3.
Above-mentioned preamble information district is made of the 00h of sync byte and continuous 4 bytes.Simultaneously, sync byte (SB
(N) BCA) and repeat sync byte (RS
(N) BCA) be inserted in before 4 information datas, and increase successively according to certain pattern.
Above-mentioned data field is connected with the preamble information district, and it is made of following components: the information data (I of 16n-4 byte
0, I
1... I
16N-5); Judge the error detection coding (D of 4 bytes of using when whether wrong existence is in the information data
0, D
1, D
2, D
3); Error correction coding (the C of 16 bytes
00, C
01... C
33).Here, N represents it is more than 1, the integer below 12.Repeat sync byte according to one group of input of per 4 words.
Be connected with synchronizing information district, back after the above-mentioned data field, synchronizing information district, above-mentioned back is made of the 55h of 4 bytes.
1 error correction unit is made of 52 bytes, and it constitutes the row of BCA data.Therefore, in the structure of BCA data, there are 4 error correction unit.
On the other hand, just keeping intact from the data of disk interpretation is stored in the storage space, when existing wrong the time, just in allowed limits existing mistake is revised.The data value of revising just is stored in the position of original storage.
Even if exist a unit not revise in 4 error correction unit to existing mistake, data by the error detection coding interpretation will be judged as misdata so, and it is stored in the storage space, these data can not be used.
In this case, as shown in Figure 4, reading of data again once more after the position of change light picker, and carry out error correction (for example: vary to scanning position B) from scanning position A.
Like this, after the position by the change light picker, and the reason of decoding again is that the BCA regional space is bigger, and producing wrong reason may be the disk scratch, perhaps has defective, or the loop is subjected to short-time pulse waveform to disturb factors such as (glitch).
For example, as shown in Figure 4, suppose there is the BCA coding of pattern as shown in Figure 4 that though at scanning position A mistake has taken place, the scanning position B after the light picker change then mistake can not occur.Therefore, if after the position of light picker changed a little, avoid the abrasive position of disk, then can there be wrong data.
But, when exist can not interpretation by scanning position A Bit data the time, then eliminate from all Bit datas of scanning position A interpretation, only utilize from the result of scanning position B interpretation.If like this, when having the BCA coding of pattern as shown in Figure 5,, scanning position also still may have mistake even being altered to scanning position B.Therefore, its result data also is out of use data.
In addition, in the time of storage BCA coding, owing to be to utilize YAG laser to store.So, such thing often takes place in the terminal part branch on the both sides in BCA zone.
In order to address this is that, to be stored in the data of a part of position on the disk in the process of decoding in the BCA zone, even the failure that corrects mistakes is arranged in each error correction unit, all data of deletion storage then, major punishment read data and carry out error correction then.Can improve the accuracy of information through the data of correctly carrying out error correction.This has just proposed a kind of method that corrects mistakes and improve the data accuracy.
According to the open communique 2000-132903 of Jap.P., the correction state cue mark of each error correction unit is stored with data, not all is the data of revising through correct even say 4 error correction unit, does not also need all data are all deleted.There is a kind of method that the data through correct amending unit can be reused.
That is to say, utilize structure as shown in Figure 6, interpretation BCA coding also carries out error correction, then the data in each error correction unit is stored with the state of correction cue mark.Simultaneously, when judging that by error detection coding existence is wrong, then interpretation BCA coding also carries out the error correction process repeatedly once more.Similarly, data are stored with the state of correction cue mark.
To compare with the correction state cue mark that comprises error correction unit separately through the data of gained after above-mentioned 2 interpretations and the makeover process, and the error correction unit of the correction state cue mark of failure does not appear in selection, then the gained data are stored as final data, and by the output of BCA coding.
When the data that in the 2nd process, also obtain correctly to revise, just repeat same process once more.
But also there are several problems in this mode.
At first, under the situation of as shown in Figure 5 pattern, cause that the BCA coding produces one of wrong reason and is likely that end portion by the BCA zone causes, and unlikely be that all structures by the BCA zone cause.Like this, only otherwise light picker is moved to the centre position in BCA zone, will continue to occur mistake.Therefore, if use above-mentioned error correcting method then need to use a lot of storeies.
In addition, in the process of interpretation BCA module, most probable causes that the wrong reason that produces should be that disk is disturbed by short-time pulse waveform to cause, and unlikely as shown in Figure 5 pattern disk distorted deformation cause.
Particularly, with data storage the coding of the BCA to disk the time by the data morphosis of storage as shown in Figure 7 that is centered on by the BCA waveform.Therefore, be subjected to short-time pulse waveform to disturb the mistake that causes to increase more by disk.Be subjected to short-time pulse waveform to disturb the mistake that causes to show as the phenomenon that occurs behind the first half in process BCA zone by disk.So, when carrying out error correction, be positioned at the center section in BCA zone even say light picker by original method, also still need more storage space.
With data storage on CD and in the process of playing, owing to use the situation of BCA coding considerably less.Therefore, minimum should be at least the storer of original data more than 2 times by the use capacity, and this all is very unaccommodated concerning the operation of all systems.
[summary of the invention]
The present invention just researches and develops for addressing the above problem.The object of the present invention is to provide a kind of devices and methods therefor that can carry out error correction, promptly when the BCA coding being carried out interpretation and correct mistakes, it can correctly be revised mistake, thereby can further improve the accurate probability of gained data.
In addition, another object of the present invention is to provide a kind of devices and methods therefor that can carry out the error in data correction, promptly in the process that the BCA coding is decoded, necessary storer is minimized.
To achieve these goals, has the feature that constitutes by following components according to data error correcting unit of the present invention: the pretreatment portion that burning district coding is carried out interpretation and decodes;
The data-carrier store that includes the error correction unit, described data-carrier store comprises the data that show the error correction unit and stores with the correction state cue mark of the error correction state that shows above-mentioned error correction unit, described correction state cue mark is an enable signal, described data-carrier store can only carry out record once more to the error correction unit that can not carry out error correction, and is to carry out data recording with the form that covers;
With above-mentioned error correction unit is the error correcting unit that the mistake of above-mentioned data is revised by unit, described error correcting unit is when having the situation of the error correction unit that can not carry out error correction at least more than one data of the data by interpretation first time process input, by carrying out repeatedly after the interpretation process, with the data input, carry out error correction;
Judge the wrong detection unit that whether has mistake in the burning district coding.
In addition, above-mentioned pretreatment portion has following feature: promptly when having more than one error correction unit in the above-mentioned error correcting unit at least when carrying out the error correction failure, pretreatment portion just carries out interpretation to the BCA coding repeatedly.
In addition, above-mentioned pretreatment portion has following feature: promptly according to pretreatment portion to the situation that BCA coding carries out interpretation repeatedly, the position of light picker can be changed.
In addition, above-mentioned error correcting unit has following feature: promptly for all error correction unit, before error correction finishes, can not carry out the error correction of the error correction unit of error correction and just carry out repeatedly always.
In addition, above-mentioned wrong detection unit has following feature: promptly it can utilize the error detection coding that comprises inside the data that mistake is detected.
Have the feature that comprises following step according to error in data modification method of the present invention: the error in data modification method comprises:
The step that burning district on disk coding is carried out interpretation and decodes;
The data storage that will comprise the error correction unit of above-mentioned process decoding arrives the step of storer;
The data of above-mentioned storage are carried out the step of error correction according to the unit of error correction unit;
The correction state cue mark that shows the error correction state of above-mentioned error correction unit is stored into the step of storer;
Judge whether the step of data storage in the storer according to described correction state cue mark;
To store the step of the position that storer stores before this through the data that obtain after the above-mentioned error correction process again into; Judge and whether have wrong step in the above-mentioned data;
If have mistake in the above-mentioned data, then the error correction unit is carried out repeatedly the step of error correction.
In addition, above-mentioned carry out between the step of error correction and the step that described correction state cue mark stores storer into further comprising the steps of: show through the whether successful step of the error correction of the data that obtain after the error correction.
In addition, the step of carrying out error correction in the error correction unit concerning above-mentioned existence mistake repeatedly has following feature: promptly for all error correction unit, continued to carry out error correction before error correction finishes.
In addition, also have following feature according to error correcting method of the present invention: promptly after the error correction unit to above-mentioned existence mistake carried out error correction repeatedly, the error correction unit that is carried out error correction was stored on the position of storage before this again.
The above-mentioned step that the coding of BCA on the disk is carried out decoding after the interpretation has following feature: promptly according to its situation that mistake is revised repeatedly can be changed the scanning position of light picker.
A kind of its method of device that the data mistake is revised can be provided according to the present invention,, thereby the accuracy rate of the data after correctly carrying out error correction can be further improved promptly by after BCA coding being carried out carry out error correction after the interpretation.
In addition, another object of the present invention is to provide a kind of devices and methods therefor that can carry out the error in data correction, promptly in the process that the BCA coding is decoded, necessary storer is minimized.
[description of drawings]
Fig. 1 is the synoptic diagram that expression describes the coding of the BCA on the disk.
Fig. 2 and Fig. 3 synoptic diagram that to be expression describe the structure of BCA coding.
The synoptic diagram that the change situation of Fig. 4 and Fig. 5 scanning position that to be expression cause the mistake by BCA coding describes.
Fig. 6 represents in the error correction process of the BCA of conventional art coding the synoptic diagram that utilizes correction state cue mark to describe.
Fig. 7 is that expression is to storing the synoptic diagram that the BCA coding describes with data.
Fig. 8 is the synoptic diagram of expression to describing according to data error correcting unit of the present invention.
Fig. 9 is the process flow diagram of expression to describing according to error in data modification method of the present invention.
[embodiment]
Below, with reference to the accompanying drawings the embodiment according to data error correcting unit of the present invention and method thereof is described in detail.
Fig. 8 is the synoptic diagram of expression to describing according to data error correcting unit of the present invention.
With reference to Fig. 8 as can be seen, the present invention is made of following components: the BCA on disk coding is carried out after the interpretation pretreatment portion (preprocessor) 10 that the signal that carries out RZ modulation and phase encoding is decoded; Carry out the error correcting unit (ECC) 12 of RS deciphering; Judge the wrong detection unit (EDC) 13 that whether has mistake in the BCA coding; Storage memory of data (memory) 11; Control the BCA controller 14 of above-mentioned pretreatment portion 10, error correcting unit 12, wrong detection unit 13 and storer 11.
At first, BCA coding input pretreatment portion 10 that will interpretation from disk, 10 pairs of above-mentioned pretreatment portions carry out the signal of RZ modulation, phase encoding and decode.
At this moment, fixing synchronous mode is as shown in Figure 3 discerned, and generated synchronous coding.Then, synchronous coding is transferred to BCA controller 14.Behind the signal that receives the decoding beginning, just information data is stored into 12 li of storeies.
After above-mentioned storing process is finished, above-mentioned error correcting unit 12 will read from the information data of the above-mentioned storer 11 outputs unit according to the error correction unit, and carry out error correction.
After the error correction of each error correction unit is finished, store the data of revising into storer 11 li again.When error correction was failed, then error correction state cue mark was shown as failure, and kept original data and remain unchanged.
After the error correction process finishes, the input error test sections 13 of will encoding except that all the other BCA the wrong correction coding, and judge whether the BCA coding exists mistake.
At this moment, the judged result whether mistake is existed is transferred to BCA controller 14.When above-mentioned judged result is when not having mistake, above-mentioned BCA controller 14 just will be stored in the data of 11 li of storeies and export with the form of BCA coding, export the signal that the BCA decoding is finished then.
If above-mentioned judged result is when having mistake, then do not export the signal that the BCA decoding finishes.Like this, just repeat said process automatically repeatedly.
In the process that repeats repeatedly, to after the correction state cue mark of error correcting unit 12 inputs is confirmed, should be stored in where calculating in the storer to the data that must carry out interpretation repeatedly, then the signal that can store to the input of corresponding position.Have only this partial data can store the relevant position of storer into.
In addition, the cue mark that shows the correction state uses the enable signal usually.Therefore, the data in the error correction unit after correctly carrying out error correction can be damaged not at all.
Finished corresponding data are carried out interpretation and storing process after, the error correction unit that correction state cue mark is shown as failure carries out error correction, after error correction is finished, whether exist the situation of mistake to confirm to the data in the error correction unit through correctly carrying out error correction of storage before comprising by error detection coding.
If judged result is not have mistake, then the data of storage are exported with the form of BCA coding, export the signal that the BCA decoding is finished then.
If above-mentioned judged result is still to have mistake, then confirm, and repeat said process repeatedly revising the state cue mark, when the number of times that does not have mistake or repeat repeatedly is restricted till.
When this feature is BCA on the data track that is present on the disk when being coded in the pattern that forms on the characteristic as shown in Figure 5, need not move other light picker, and, just can revise mistake at an easy rate by increasing the mode of the number of times that repeats.
Compare with the time that is caused by the number of times that increases repetition or the consumption of electric power, the operation of the necessary system of light picker work can consume more time and more electric power on the contrary.Therefore, when repeatedly number of times surpassed the scope of setting, light picker also can carry out work.
As mentioned above, when at least more than one data of the data of the present invention by interpretation first time process input are when having the situation of the error correction unit that can not carry out error correction, though can not correctly carry out error correction for the first time, but data are imported after the interpretation process by carrying out repeatedly.Like this, just can correctly carry out error correction.
In addition, when repeating the interpretation process, storer does not append the storage data at every turn, but carries out data storage with the form that covers.Therefore, the data of storage and the number of times of repetition are irrelevant, so usually only need to use minimum storage space just passable.
Fig. 9 is the process flow diagram of expression to describing according to error in data modification method of the present invention.
Below, with reference to Fig. 9 foundation error in data modification method of the present invention is elaborated.
At first, the coding of the BCA on the disk is carried out interpretation, and decode.Then, store information data into S100 in the storer, S110.
After data storage is finished, will read from the information data of storer output unit, and carry out error correction S120 according to the error correction unit.
For each error correction unit, after the error correction process finishes, will be deposited in the storer again through the data of revising.When error correction is failed, then revise the state cue mark and be shown as failure, and keep the original data S130 that remains unchanged.
After the error correction process finishes, just judge whether above-mentioned data exist wrong S140.
If above-mentioned judged result is to have mistake, just automatically carry out error correction S150 to revising the error correction unit that the state cue mark is shown as failure.
Simultaneously, when each error correction unit all is the situation of process correction, just the data of storage are exported by the BCA coding, exported the signal S160 of BCA decoding end then.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the instructions, must determine its technical scope according to interest field.
Claims (10)
1. data error correcting unit comprises:
The pretreatment portion that burning district coding is carried out interpretation and decodes;
The data-carrier store that includes the error correction unit, described data-carrier store will comprise the data of error correction unit and store with the correction state cue mark of the error correction state that shows above-mentioned error correction unit, described correction state cue mark is an enable signal, described data-carrier store can only carry out record once more to the error correction unit that can not carry out error correction, and is to carry out data recording with the form that covers;
With above-mentioned error correction unit is the error correcting unit that the mistake of above-mentioned data is revised by unit, described error correcting unit at least more than one data in by the data of interpretation first time process input are when having the situation of the error correction unit that can not carry out error correction, by carrying out repeatedly after the interpretation process, with the data input, carry out error correction;
Judge the wrong detection unit that whether has mistake in the burning district coding.
2. data error correcting unit as claimed in claim 1 is characterized in that,
Described pretreatment portion just carries out interpretation to burning district coding repeatedly for when having more than one error correction unit in the above-mentioned error correcting unit at least when carrying out the error correction failure.
3. data error correcting unit as claimed in claim 1 is characterized in that,
Described pretreatment portion, can change the position of light picker the situation that burning district coding carries out interpretation repeatedly according to pretreatment portion.
4. data error correcting unit as claimed in claim 1 is characterized in that,
Described error correcting unit is for all error correction unit, is before error correction finishes, and the error correction of the error correction unit that can not carry out error correction is just carried out always repeatedly.
5. data error correcting unit as claimed in claim 1 is characterized in that,
The error detection coding that described wrong detection unit can utilize the data the inside to comprise detects mistake.
6. error in data modification method comprises:
The step that burning district on disk coding is carried out interpretation and decodes;
The data storage that will comprise the error correction unit of above-mentioned process decoding arrives the step of storer;
The data of above-mentioned storage are carried out the step of error correction according to the unit of error correction unit;
The correction state cue mark that shows the error correction state of above-mentioned error correction unit is stored into the step of storer;
Judging whether according to described correction state cue mark will be through the data storage that obtains after the error correction process step in the storer;
According to described judged result, will store the step of the position that storer stores before this again into through the data that obtain after the above-mentioned error correction process; Judge and whether have wrong step in the above-mentioned data;
If have mistake in the above-mentioned data, then the error correction unit is carried out repeatedly the step of error correction.
7. error in data modification method as claimed in claim 6 is characterized in that,
Described carry out between the step of error correction and the step that described correction state cue mark stores storer into further comprising the steps of: show through the whether successful step of the error correction of the data that obtain after the error correction.
8. error in data modification method as claimed in claim 6 is characterized in that,
The step that the wrong error correction unit of described existence carries out error correction repeatedly continued to carry out error correction for all error correction unit before error correction finishes.
9. error in data modification method as claimed in claim 6 is characterized in that,
Described method further is included in after error correction unit to above-mentioned existence mistake carries out error correction repeatedly, and the error correction unit that is carried out error correction is stored on the position of storage before this again.
10. error in data modification method as claimed in claim 6 is characterized in that,
The described step that the coding of burning district on the disk is carried out decoding after the interpretation comprises according to the situation that mistake is revised repeatedly and the scanning position of light picker can be changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100890974A CN100411050C (en) | 2004-12-06 | 2004-12-06 | Data error correcting unit and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100890974A CN100411050C (en) | 2004-12-06 | 2004-12-06 | Data error correcting unit and method thereof |
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| CN1787102A CN1787102A (en) | 2006-06-14 |
| CN100411050C true CN100411050C (en) | 2008-08-13 |
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| CN106098100B (en) * | 2016-06-20 | 2019-12-10 | 乐鑫信息科技（上海）股份有限公司 | One-way bit error correction method of OTP ROM |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000132903A (en) * | 1998-10-23 | 2000-05-12 | Texas Instr Japan Ltd | Apparatus and method for correcting data error |
| CN1299132A (en) * | 1999-11-22 | 2001-06-13 | 汤姆森许可公司 | BCA data playback |
| CN1307337A (en) * | 1999-10-26 | 2001-08-08 | 索尼公司 | Data reproducing device and method |
| JP2003187535A (en) * | 2001-12-13 | 2003-07-04 | Sony Corp | Information recording apparatus and method, information recording program, recording medium, disk recording medium, disk recorder and disk recording method, disk player and disk playing method |
| CN1476013A (en) * | 2002-08-13 | 2004-02-18 | 联发科技股份有限公司 | Optical disk data read out method with error treatment |
-
2004
- 2004-12-06 CN CNB2004100890974A patent/CN100411050C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000132903A (en) * | 1998-10-23 | 2000-05-12 | Texas Instr Japan Ltd | Apparatus and method for correcting data error |
| CN1307337A (en) * | 1999-10-26 | 2001-08-08 | 索尼公司 | Data reproducing device and method |
| CN1299132A (en) * | 1999-11-22 | 2001-06-13 | 汤姆森许可公司 | BCA data playback |
| JP2003187535A (en) * | 2001-12-13 | 2003-07-04 | Sony Corp | Information recording apparatus and method, information recording program, recording medium, disk recording medium, disk recorder and disk recording method, disk player and disk playing method |
| CN1476013A (en) * | 2002-08-13 | 2004-02-18 | 联发科技股份有限公司 | Optical disk data read out method with error treatment |
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