WO2004051650A1 - データ記録再生装置及び、データ記録再生方法 - Google Patents
データ記録再生装置及び、データ記録再生方法 Download PDFInfo
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- WO2004051650A1 WO2004051650A1 PCT/JP2002/012529 JP0212529W WO2004051650A1 WO 2004051650 A1 WO2004051650 A1 WO 2004051650A1 JP 0212529 W JP0212529 W JP 0212529W WO 2004051650 A1 WO2004051650 A1 WO 2004051650A1
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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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
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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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1806—Pulse code modulation systems for audio signals
- G11B20/1813—Pulse code modulation systems for audio signals by adding special bits or symbols to the coded information
-
- 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
-
- 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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
Definitions
- the present invention relates to a format of data recorded on a recording medium by a data recording / reproducing apparatus, a data recording / reproducing apparatus, and a data recording / reproducing method.
- the present invention relates to a data format, a data recording / reproducing device, and a data recording / reproducing method capable of strongly correcting a data error generated due to dust or scratches on the data.
- Fig. 1 is a diagram showing the relationship between the conventional ECC sector (error correction code sector), its format, and the recording data sequence.
- the recorded data is, for example, ££, as shown in the (A) ECC sector of FIG. ⁇ Sector 0 (100), EC. It consists of sector 1 (110), ECC sector 2n-l (120), and ECC sector 2n (130).
- ECC sector 0 (100) contains, for example, data 0/0 (101), data 0/1 (102), and data 0/15 ( It has a format composed of data blocks such as 103). And each data such as data 0/0 (101)
- Each tab consists of header information indicating the beginning of the data block and the contents of the data.
- the data recording / reproducing device uses an error correction code or an error correction code (ErrorCorrectingCode, or ECC) to accurately restore the data recorded on the recording medium.
- ECC error correction code
- the data recording / reproducing unit reproduces data from the recording medium
- the data reproduced from the recording medium may be wrong or missing due to scratches on the recording medium or dust and dust. . Even if such a data error occurs, redundant data is added to the original data so that the data can be correctly reproduced from the recording medium. Correct the data.
- ECC a parity code ⁇ CRC code is known. Further, a typical example of ECC is a Reed-So1mon code.
- ECC Error-So1mon code.
- the data recorded on the recording medium is encoded, and this is called one EC. Generate as a sector. That is, the ECC sector is one group of data encoded by the error correction code. Then, for example, this one ECC sector as shown in ECC sector 0 (100) in FIG. 1 is replaced with data 0/0 ⁇ as shown in FIG. 1 (B). :! ⁇ ⁇ Data is divided into data blocks such as (102) and 015 (103). At the beginning of each data block, a header is added to detect the beginning of the data block during playback.
- the recorded data sequence (C) in Figure 1 shows the recording mechanism of the data block divided into ECC sectors as described above. As shown in FIG. 1C, the data sequence to be recorded is recorded in the order of the divided data blocks described above.
- FIG. 2 is a diagram illustrating an example of a data recording / reproducing device.
- the data recording / reproducing apparatus 200 shown in FIG. 2 mainly includes an ECC encoder 201, a modulator 202, a recording circuit 203, a recording medium 204, a reproducing circuit 205, a demodulator 206, and an ECC decoder 207.
- ECC encoder 201 As described above, the data is ECC encoded and divided into data blocks. The data divided into data blocks is sent to modulation circuit 202.
- the modulation circuit 202 modulates the divided data into a modulation code suitable for a recording / reproducing system including the recording medium 204.
- the recording medium 204 has an optical disc in which ⁇ is (1, 7) RLLC (Run Length Limited Code)- ⁇ EFM (Eighthtoto Fourteen Modulation). , 8-14 modulation).
- the data modulated by the modulator 202 is sent to the recording circuit 203.
- the recording circuit 203 converts the modulated data into a recording signal, supplies the recording signal to a recording head, and records the modulated data on the recording medium 204.
- the reproduction circuit 205 reproduces a reproduction signal detected by the reproduction head from the recording medium 204.
- the reproduced signal thus reproduced is sent to the demodulation circuit 206.
- the demodulator 206 demodulates the modulation code modulated as described above, and reproduces a data block.
- the data block reproduced in this way is sent to the same decoder 207.
- the demodulator 207 collects a plurality of divided data blocks to generate one ECC sector. Then, the error data in the ECC sector thus formed is corrected, and the data 220 is decoded.
- Recording media such as optical disks, magneto-optical disks, magnetic disks, and magnetic tapes generally have partial defects that occur during manufacturing.
- the number of defective parts on the exchangeable media, such as optical disks and magnetic tapes increases due to the attachment of dust and scratches due to improper handling.
- the aforementioned ECC corrects errors in the reproduced signal that occur in this way.
- a reproduced signal for example, a burst error signal
- the information indicated by such a burst error signal must be obtained from the likelihood information indicated by the original correct data. It becomes likelihood information that is far apart. Therefore, greatly different likelihood information is propagated to other correctly reproduced data through the prior information obtained from the decoding result before being used for decoding the data. As a result, there is a problem that error propagation occurs and the effect of iterative decoding cannot be sufficiently obtained.
- the present invention has been made in view of the above points, and a data format and a data format that can more strongly correct data errors caused by dust and scratches on a recording medium even by using the conventional ECC.
- the purpose is to provide a self-recording playback method and device.
- the present invention is configured as follows.
- an error correction encoder that performs error correction encoding of input data
- the ECC sector composed of the error correction code generated by the tlFlB error correction encoder is divided into predetermined data units, and tfiis is divided into predetermined data units by the tins repetition code encoder.
- ttilB Consists of a unit of data that has been repeatedly coded.
- ⁇ a reproducing unit for reproducing the predetermined data unit from a recording medium
- a data recording / reproducing apparatus comprising: an iterative code decoder for iteratively decoding a predetermined unit of data which has been reproduced by liit itself; and an error correction decoder for correcting an error of an output of lift self-iterative decoding.
- the disparity generating unit includes a dispersing unit that disperses a predetermined unit of data generated by the disgusting generating unit, and the dispersing unit disperses the unit of the repetitively encoded data using two or more ECC sectors, and The unit of the obtained tllH iteratively encoded data is output to the ⁇ recording unit and recorded on the tiiia recording medium.
- a generation unit that divides an ECC sector composed of an error correction code generated by the ttit self-error correction encoder into predetermined data units, and generates a predetermined data unit of tfjf;
- ⁇ a recording unit that records the unit of predetermined data generated by the generation unit on a recording medium
- a data recording / reproducing apparatus that has an error correction function for correcting errors in data reproduced from a recording medium! /
- the self distributing unit has a dispersing unit that disperses the predetermined data unit generated by the disgusting generating unit, and the dispersing unit disperses the predetermined data unit using two or more ECC sectors.
- the unit of the predetermined tfilB data is output to the self-recording unit and recorded on the recording medium.
- the data recording / reproducing apparatus according to claim 1 or 2, wherein the tff! B distribution is not continuous with the unit power of ttrlB predetermined data of the same ECC sector.
- the present invention is characterized in that a memory having a data capacity equal to or larger than the data capacity of the ECC sector for performing the distribution is provided.
- the variance is obtained by inputting an odd-numbered unit of the predetermined data in a different ECC sector;
- the ⁇ variance contains the odd-numbered IE predetermined data unit of one ECC sector and the even-numbered predetermined data unit of another ECC sector.
- the variance has a recording unit and a reproducing unit that can simultaneously record or reproduce two or more data blocks.
- Each recording unit and reproducing unit has f ff of two or more ECC sectors. Distributing the predetermined data unit from each of them. .
- the knitting data buffer capacity When it is determined that the input data is continuous with data equal to or greater than the data amount of the two ECC sectors, the knitting two ECC sectors are added. It is characterized by being dispersed and recorded on a Fujimi recording medium. The tenth is: ⁇ ⁇ ⁇ ⁇ Data buffer power tiff In order to judge that the self-input data is smaller than the data amount of one ECC sector, tffl own one ECC sector is used. A special feature is to record data separately from recording data or dummy data.
- the eleventh feature is that, with reference to a file allocation table, it is determined whether or not an unrecorded sector capable of recording two ECC sectors exists in the recording medium.
- the first feature is that if there are unrecorded sectors in which two ECC sectors can be recorded on the self-recording medium, ifB distribution is performed using ECC sectors generated from the input data and dummy data. And '
- the fifteenth feature is that, when the burst error is detected by the burst error detector, the data reproduced from the t & IB recording medium is processed as lost data by the nervous error correction decoder.
- the repetition code is a unit of tirfB repetition encoded data. Parity is added to the position, and self-repetition code decoding is characterized by using the parity added to the unit of the repetition-coded data reproduced from the tfif self-recording medium to judge lost data.
- the 17th feature is that the distribution is performed using three or more ECC sectors.
- the eighteenth feature is that a predetermined data unit is distributed and recorded on different tracks of the tfilB recording medium.
- the nineteenth feature is that tin predetermined data units are dispersedly recorded on the front and back surfaces of the tin self recording medium.
- the 20th is generated by an error correction coding step of performing error correction coding of input data, a repetition code coding step of data output from the m correction coding step, and a mm correction coding step.
- E composed of error-correcting codes
- C Sectors are divided into predetermined data units, ij, and fft is divided into predetermined data units,
- a data recording / reproducing method comprising: (i) an iterative code decoding step for iteratively decoding a unit of the reproduced data; and (ii) an error correction decoding step for error correction of an output of the iterative code decoding step.
- the unit of the distributed tin-iteratively encoded data is output to the recording step and recorded on the recording medium.
- the second is that it has an error correction coding step for error correction coding of the input data, and the Ecc sector composed of the error correction code generated by the self error correction coding step is divided into predetermined data units.
- the method further comprises a distribution step of distributing the predetermined data unit generated by the fit self generation step, wherein the distribution step is performed by dispersing the predetermined data unit using two or more ECC sectors.
- the unit of the predetermined data is output to a self-recording step and recorded on the recording medium.
- a data block obtained by dividing one ECC sector is mutually input with a block obtained by dividing another ECC sector, and recording is performed in a distributed manner.
- a long burst error may occur across several data blocks in the ECC sector due to the influence of dust, scratches, and the like.
- the conventional method exceeds the error correction capability of the ECC and cannot correct the error, but the data recorded in the format of the present invention includes a plurality of ECC sectors.
- the burst error is a short, distributed error that spans multiple ECC sectors because the data blocks are recorded in a distributed manner.
- FIG. 1 is a diagram showing the relationship between a conventional ECC sector, its format, and a recording data string.
- FIG. 2 is a diagram illustrating an example of a data recording / reproducing device.
- FIG. 3 is a diagram showing a data distribution rule (even-odd replacement type) according to the first embodiment of the present invention.
- FIG. 4 is a diagram showing a data distribution rule (odd and odd replacement type) according to the second embodiment of the present invention.
- FIG. 5 is a diagram showing an example of a format to which the data distribution rule according to the second embodiment of the present invention is applied.
- FIG. 6 is a diagram showing a data distribution rule (3-sector type) according to the third embodiment of the present invention.
- FIG. 7 is a diagram showing a format example to which the data distribution rule according to the third embodiment of the present invention is applied.
- FIG. 8 is a diagram showing a data recording / reproducing apparatus for distributed recording according to a fourth embodiment of the present invention.
- FIG. 9 is a diagram showing a flow chart embodiment in which the data recording / reproducing apparatus for distributed recording of the fourth embodiment of the present invention performs distributed recording.
- FIG. 10 is a diagram showing a data recording / reproducing apparatus (a recording system parallel configuration) for distributed recording according to a fifth embodiment of the present invention.
- FIG. 11 is a diagram showing an example of a conventional data recording / reproducing apparatus using iterative decoding.
- FIG. 12 is a diagram showing an example of a format in which the distribution rule according to the present invention is applied to iterative decoding.
- FIG. 13 is a diagram showing an apparatus for iteratively decoding / recording / reproducing distributed recording according to a sixth embodiment of the present invention.
- FIG. 14 is a diagram illustrating an example of a burst error detection circuit.
- Figure 15 shows the conventional method :! It is a figure showing an example showing the influence of the burst error of ⁇ .
- FIG. 16 is a diagram showing an example showing the effect of the present invention on burst errors.
- FIG. 17 is a diagram illustrating the effect of applying iterative decoding to a burst error in the conventional method.
- FIG. 18 is a diagram showing the effect when the iterative decoding of the present invention is applied to a burst error.
- FIG. 3 is a diagram showing a data distribution rule according to the first embodiment of the present invention, in which an interleave (or dispersion) force performed by the data recording / reproducing apparatus includes an even data block of one ECC sector and another data block. This is an example of a method for storing a data block of the ECC sector's odd Iku Ban.
- Fig. 3 shows an example in which odd-numbered data blocks in ECC sector 0 (410) and even-numbered data blocks in ECC sector 1 (420) are inserted. That is, ECC sector 0 (410) of (A) ECC sector in Fig. 3 has ( ⁇ ) data blocks D0 / 0 (411), D0 / 1 (412), and D0 / 2 before interleaving. (413), D0 / 3 (414), D0 / 4 (415), and D0 / 5 (416). ECC sector 1 (420) of (A) ECC sector in Fig. 3 ( ⁇ ) Before interleaving, data blocks D 1/0 (421), D 1/1 (422), D 1/2 (423), D 1/3 (424), D 1/4 (425), and D 1/5 (426).
- (C) the sequence of data blocks to be recorded after interleaving (after exchange) is D0 / 0 (411), D1 / 0 (421), D0 / 2 (413), D1 / 2 ( 423), D0 / 4 (415), D 1/4 (425), D0 / 1 (412), D 1/1 (422), DO / 3 (414), D1 / 3 (424), D0 / 5 (416) and D 1/5 (426).
- data blocks of different ECC sectors are continuously recorded on the recording medium.
- FIG. 4 is a diagram showing a data distribution rule according to the second embodiment of the present invention, in which an interleave performed by the data recording / reproducing apparatus includes an odd-numbered data block of one ECC sector and another ECC sector.
- 5 is an embodiment of a method for inserting an odd-numbered data block.
- components with the same reference numerals as those in FIG. 3 indicate the same components.
- ECC sector 0 (410) of (A) ECC sector in FIG. 4 is (B) data block D 0/0 (411), D0 / 1 (412), D0 / 2 (4 13), D0 / 3 (414), D0 / 4 (415), and D0 / 5 (416).
- (A) ECC sector 1 (420) of the ECC sector is (B) Data blocks D1 // 0 (421), D1 / 1 (422), D1 / 2 before interleaving. (423), D 1/3 (424), D 1/4 (425), and D 1/5 (426).
- FIG. 5 is a diagram showing a format example to which the data distribution rule according to the second embodiment of the present invention is applied.
- Figure 5 shows the (A) and (B) ECC sectors shown in Figure 1.
- the data distribution according to the second embodiment of the present invention in which the odd data block of one ECC sector is replaced with the odd data block of another ECC sector,
- An example of (C) generating a recorded data string by applying a rule will be described.
- (C) In the recorded data sequence, data 0 1 (102) of the odd-numbered data block of ECC sector 0 (100) and data 1/1 (112) of the odd-numbered data block of ECC sector 1 (100), etc. has been replaced.
- FIG. 1 shows the recording data sequence shown in FIG. 1 and the recording order of the data blocks.
- the interleaving performed by the data recording / reproducing device is
- the data block of one ECC sector, the odd-numbered data block, and the odd-numbered data block of the other ECC sector have been described;
- the even data block of another ECC sector may be replaced.
- FIG. 6 is a diagram showing a data distribution rule (three-sector type) according to the third embodiment of the present invention.
- a data block is divided into three over 15 ECC sectors. This is an embodiment of a method for inserting a data block.
- the components denoted by the same reference numerals as those in FIG. 3 indicate the same components.
- Figure 6 (A) £. . £ at the end of the sector.
- Sector 0 (410) contains (B) data blocks D0Z0 (411), D0 / 1 (412), DO / 2 (413), D0 / 3 (414), D0 / 4 ( 415) and DO / 5 (416).
- (A) ECC sector 1 (420) of the ECC sector (B) Before interleaving, data blocks D 1/0 (421), D 1/1 (422),
- ECC sector 2 (4 30) is (B) before interleaving, the data blocks D 2/0 (431), D 2/1 (432), D2 / 2 (433), D 2/3 (434), D 2/4 ( 435), and D 2/5 (436).
- the 0th data block DO / 0 (411) from ECC sector 0 (410) 1 the 0th data block D lZO (421) from ECC sector 1 (420) and The 0th data block D 2/0 (431) is collected from the ECC sector 2 (430).
- the third data block D 2/3 (434) is collected from (430).
- the sequence of data blocks to be recorded after (C) interleaving is D 0/0 (411), D 1/0 (421), D2 / 0 (431), D0 / 3 (414), D 1 / 3 (424), D2 / 3 (434), etc.
- data blocks of different ECC sectors are continuously recorded on the recording medium.
- FIG. 7 is a diagram showing an example of a format to which the data distribution rule according to the third embodiment of the present invention is applied.
- FIG. 7A shows the ECC sector
- FIG. 7B shows the format of the data block of the ECC sector
- FIG. 7C shows the recording data sequence.
- data blocks are sequentially extracted from each ECC sector 0, ECC sector 1, and ECC sector 2 according to the rules described in the third embodiment, and D0 / 0 (701), D 1/0 (711), D2 / 0 (721),
- FIG. 8 is a diagram showing a data recording / reproducing apparatus for distributed recording according to a fourth embodiment of the present invention.
- FIG. 9 is a diagram showing an example of a flowchart in which the data recording / reproducing apparatus for distributed recording according to the fourth embodiment of the present invention performs distributed recording.
- the data recording / reproducing apparatus for distributed recording mainly includes an ECC encoder 201, a modulator 202, a recording circuit 203, a recording medium 2 04, Regeneration circuit 205, Demodulator 206, ECC ⁇ - ⁇ 207, Data buffer 801, Controller 802, First switch 803, EC 0 4, a dummy data generator 805, a second switch 806, an interleaver 807, and a deinterleaver 808.
- step S901 of FIG. 9 the data recording / reproducing apparatus shown in FIG. 8 is logically formatted from a personal computer or the like, which is an upper female device, through an interface between the upper device and the data recording / reproducing device.
- user data 210 divided into recording units for example, a size supported by the operating system (OS) such as 2 KB or 32 KB
- OS operating system
- ECC encoding / decoding is performed in units of this data size.
- step S902 the supplied data 210 is taken into the data buffer 811, and the size of the data is monitored.
- the first switch 803 is switched by the controller 802, monitoring whether the data uses two or more ECC sections or not. If the data is continuous, the process proceeds to step S903.
- step S903 the CPU refers to the file allocation table (recorded at a specific location on the medium) to find a location where data for two ECC sectors can be recorded.
- step S904 it is determined whether an unrecorded area for two ECC sectors has been found. If no blank area for 2 ECC sectors is found ⁇ Proceed to step S905.
- step S905 the controller 802 selects the position a of the first switch 803 and the second switch 806.
- step S906 the data ( ⁇ -Dl) of one ECC sector is ECC-encoded by the ECC encoder 201, and the data of another ECC sector is obtained.
- step S907 the data interleaved by the interleaver 807 is sent to the modulator 202 and modulated by a modulation code suitable for recording and reproduction.
- Optical disks use (1, 7) RLLC or EFM modulation as described above.
- the modulated data is recorded by the recording circuit 203 in two sectors of the recording medium 204 which are found to be unrecorded.
- the target EC recorded on the recording medium 204 As described above.
- the position of the data recorded in a distributed manner is found by referring to the file allocation table described above. Then, the data recorded at that position is reproduced by the reproduction circuit 205 and demodulated by the demodulation circuit 206. Then, the demodulated data is returned to the data sequence before being dispersed by the Dinter Reaver 808, the error in the reproduced data is corrected by the ECC decoding 207, and the reproduced data is reproduced as the user data 220.
- step S902 determines whether the data is not continuous, that is, that only the data of one ECC sector has been input as the user data 210.
- step S908 a free area for one sector on the recording medium 204 is searched for with reference to the file allocation table.
- the strings in the state of two continuous sectors ti 1 and n on the recording medium 20 can be classified into three as follows. (1) Sector n-1 is unrecorded (recordable) and sector n is unrecorded (recordable).
- step S909 it is determined in step S909 that sector n-1 is unrecorded (recordable), and that in step S910, sector n is also unrecorded (recordable). If so, the process proceeds to step S911.
- the position of the first switch 803 may be any position, and the position of the second switch 806 is selected as the position b.
- step S912 the data encoded by the ECC encoder 201 is interleaved with the dummy data power interleaver 807 generated by the dummy data generator 805 as described above.
- step S 913 the data interleaved by the interleaver 807 is sent to the modulator 202 and modulated with a modulation code suitable for recording and reproduction.
- Optical disks use (1, 7) RLLC or EFM modulation as described above.
- the modulated data is recorded by the recording circuit 203 in two sectors of the recording medium 204 which are found to be unrecorded.
- the dummy data can be handled as unrecorded in the above (2) and (3).
- step S909 it is determined in step S909 that sector n-1 is unrecorded (recordable), and in step S910 it is determined that sector n is already recorded If so, go to step S914.
- step S914 the position of the first switch 803 is selected by the controller 802 at the position b, and the position of the second switch 806 is selected by the position a.
- step S915 the already recorded data is reproduced by the reproduction circuit 205, demodulated by the demodulation circuit 206, interleaved by the interleaver 808, and the same.
- playback 207 playback (ECC decoding) is performed once.
- ECC decoding ECC decoding
- the signal is sent from the first switch 803 to the ECC encoder 804, and is again subjected to ECC encoding.
- the data encoded by the ECC code 201 is interleaved by the interleaver 807.
- the process proceeds to step S 913, and is recorded on the recording medium 204 in the same manner as described above.
- step S909 it is determined that sector n-1 has already been recorded, and in step S916, sector n has not been recorded (recordable). If it is determined to be, the process proceeds to step S917.
- step S 917 the position of the first switch 803 is selected as the position b, and the position of the second switch 806 is selected as the position a.
- step S 918 the already recorded data is reproduced by the reproduction circuit 205, demodulated by the demodulation circuit 206, interleaved by the interleaver 808, and £. ⁇ Reproduce (ECC decoding) once with decoder 207. Then, the signal is sent from the first switch 803 to the ECC encoder 804, and is again ECC encoded. Next, the data encoded by the ECC encoder 201 is interleaved by the interleaver 807.
- step S 913 is recorded on the recording medium 204 in the same manner as described above.
- step S 916 If it is determined in step S 916 that the sector n has already been recorded, the process proceeds to step S 908, referring to the file allocation table to find one sector on the recording medium 204. Find free space for minutes.
- FIG. 10 is a view showing a data recording / reproducing apparatus (parallel recording system) for distributed recording according to a fifth embodiment of the present invention.
- the constituent elements having the same numbers as those of the 1 ⁇ constituent element shown in FIG. 8 indicate the same constituent elements.
- the data recording / reproducing apparatus for distributed recording according to the fifth embodiment of the present invention shown in FIG. 10 is different from the data recording / reproducing apparatus shown in FIG. And the recording circuit 203 shown in FIG. 8 is replaced with two recording circuits 2003-1 and 2003--2, and the reproducing circuit 205 shown in FIG. 8 is provided. Are constituted as two reproduction circuits 2055-1 and 2055-2.
- optical disk device Although it is possible for an optical disk device to have such a configuration, however, since the optical head is expensive, generally one optical head is not mounted. Les ,. However, it is possible to install a plurality of optical heads for one medium, for example, on the same surface or on both surfaces.
- the recording head 1 and the reproducing head 1 are set on the front surface of the recording medium 204, and the recording head 2 and the reproducing head 2 are set on the back surface of the recording medium 204.
- the third switch 1 001 is controlled by the controller 802, and Record separately for the front and back sides.
- record data 0 0, data 1 ⁇ 1 ⁇ data 1Z15 is recorded on the front side, and record data 1/0, data 0/1,... ' To be recorded in parallel.
- Reproduction is performed by the respective reproduction heads 1 and 2, and is sequentially output to the demodulation circuit 206 using the fourth switch 1002.
- the recording circuits 203-1, 203-2 and the reproducing circuits 205-1, 205-2 are used in parallel, but the modulator 202 / demodulator 206 is also configured in parallel, and the interleaver 807 This is the same even if the data is divided into print data on the front side and print data on the back side.
- the fifth embodiment described above an example was described in which there were two systems, a recording system and a reproduction system, but it is also possible to have three or more systems. It is also possible to record on different tracks within the same plane.
- FIG. 11 is a diagram showing an example of a conventional data recording / reproducing apparatus using iterative decoding.
- the data recording / reproducing apparatus shown in FIG. 11 mainly includes an ECC encoder 201, an iterative encoder 1101, a recording circuit 203, a recording medium 204, a reproducing circuit 205, an iterative decoder 1102, and an ECC decoder 207. Is done.
- user data 210 to be input is ECC-encoded by an ECC encoder 201, and is further encoded by a repetition code 1101 using a repetition code.
- the data encoded by the repetition encoder 1101 is recorded on the recording medium 204 via the recording circuit 203.
- FIG. 12 is a diagram showing an example of a format in which the distribution rule according to the present invention is applied to iterative decoding.
- the basic concept is the same as the data distribution rule shown in Fig. 5. However, for ⁇ using repetition codes, the recording data is distributed so that the data blocks of the same ECC sector are not continuous in the same sector of the Record and play back.
- FIG. 13 is a diagram showing an iterative decoding recording / reproducing apparatus for performing distributed recording according to a sixth embodiment of the present invention.
- the components having the same numbers as those in FIG. 8 indicate the same components.
- the iterative decoding recording / reproducing apparatus shown in FIG. 13 is different from the data recording / reproducing apparatus shown in FIG. 8 in that the repetition encoders 1301, 1302, and the iterative decoder 1303 are added and the modulator 202 and the demodulator 206 are deleted. It is.
- the operation of the iterative decoding recording / reproducing apparatus shown in FIG. 13 is the same as that of the data recording / reproducing apparatus shown in FIG.
- the repetition encoders 1301 and 1302 further perform encoding using repetition codes, are interleaved by the interleaver 807, and are in the same sector of the recording medium 204.
- the ECC sector data is arranged so that it is not consecutively arranged. Then, the data is recorded on the recording medium 204 via the recording circuit 203.
- the reproduction signal is sent to the interleaver 808 via the reproduction circuit 205, interleaved, and iteratively decoded by the iterative decoder 1303, and then ECC decoded by the ECC decoder 207.
- the reproduction circuit 205 shown in FIG. 13 has a burst error detection circuit shown in FIG. FIG. 14 is a diagram illustrating an example of a burst error detection circuit.
- the burst error detection circuit shown in FIG. 14 mainly includes comparators 1401 and 1402, shift registers 1403 and 1404, and an OR gate 1405.
- the reproduced data ⁇ input to the comparators 1 401 and 1402 are compared with the comparison levels 1420 and 1430 by the comparators 1401 and 1402, respectively.
- the comparison result is input to shift registers 1403 and 1404.
- the shift register 1403 holds the detection result of the reproduction data y; larger than the predetermined comparison level 1420; ⁇ , and the shift register 1404 stores the reproduction data y higher than the predetermined comparison level 1430. Holds the detection result of ⁇ where i is small.
- the logical sum of the comparison results held in the shift registers 1403 and 1404 is calculated by the logical sum gate 1405 and output as a burst error detection result.
- the burst error yi of the reproduced signal is monitored by the burst error detection circuit 1400 shown in FIG.
- the burst error detection circuit 1400 detects a burst longer than the unit length of the iterative decoding in the reproduced signal
- the burst information is supplied to the iterative decoding 1303 and the ECC decoding 207 to control the number of repetitions or to eliminate. It sends a flag for data handling data.
- the ECC decoding 207 performs erasure correction with reference to the flag for handling lost data.
- a parity for example, CRC
- FIG. 15 is a diagram showing an example showing the effect of a burst error in the conventional case
- FIG. 16 is a diagram showing an example showing the effect of the present invention on a burst error.
- reference numerals 1510 and 1520 indicate ECC sectors during encoding
- reference numerals 1511, 1512, 1513, 1521, 1522, and 1523 indicate data blocks
- reference numerals 1530 and 1540 indicate decoding blocks. Indicates the EC C sector.
- components denoted by the same reference numerals as those in FIG. 15 indicate the same components.
- the ECC error correction capability for a burst error of 80 data As shown in Fig. 15, a burst error of 100 data spans two data blocks, data blocks 1511 and 1512. Occurs, 100 data errors occur in one ECC sector, and ECC sector 1530 cannot perform error correction by ECC during decoding.
- the present invention when used, as shown in FIG. 16, even if a burst error of 100 data similarly occurs, for example, 50 data errors are distributed to two ECC sectors 1530 and 1540, respectively. Therefore, error data can be corrected and decoded correctly.
- FIG. 17 is a diagram showing the effect of applying the iterative decoding to the conventional burst error
- FIG. 18 is a diagram showing the effect of applying the iterative decoding of the present invention to the burst error. is there.
- reference numerals 1710 and 1720 indicate ECC sectors during encoding
- reference numerals 1711, 1712, 1713, 1721, 1722, and 1723 indicate data blocks
- reference numerals 1730 and 1740 indicate ECC sectors during decoding. Indicates a sector.
- components having the same numbers indicate the same components.
- the ECC can handle up to 5 lost data blocks; ⁇ , as shown in Figure 17, conventionally, a burst error of 1750 force S across seven iterative decoding blocks occurred, but the ECC sector 1730 Cannot decrypt the data correctly.
- the data is distributed over two or more ECC sectors as shown in Fig. 18, for example, four lost data are distributed to the ECC sector 1730 and three lost data are distributed to the ECC sector 1730. In both cases, ECC enables error correction.
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- Error Detection And Correction (AREA)
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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JP2004556776A JPWO2004051650A1 (ja) | 2002-11-29 | 2002-11-29 | データ記録再生装置及び、データ記録再生方法 |
PCT/JP2002/012529 WO2004051650A1 (ja) | 2002-11-29 | 2002-11-29 | データ記録再生装置及び、データ記録再生方法 |
AU2002354137A AU2002354137A1 (en) | 2002-11-29 | 2002-11-29 | Data recording and reproducing device, and data recording and reproducing method |
CNB028294688A CN100432945C (zh) | 2002-11-29 | 2002-11-29 | 数据记录再现装置以及数据记录再现方法 |
EP02785986A EP1566804A4 (en) | 2002-11-29 | 2002-11-29 | DATA COLLECTION AND REPRODUCTION DEVICE AND DATA COLLECTION AND REPRODUCTION METHOD |
KR1020057002842A KR100591973B1 (ko) | 2002-11-29 | 2002-11-29 | 데이터 기록 재생 장치 및 데이터 기록 재생 방법 |
US11/041,248 US7430702B2 (en) | 2002-11-29 | 2005-01-25 | Data recording/reproducing apparatus and data recording/reproducing method |
US12/194,306 US20090031187A1 (en) | 2002-11-29 | 2008-08-19 | Data recording/reproducing apparatus and data recording/reproducing method |
Applications Claiming Priority (1)
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PCT/JP2002/012529 WO2004051650A1 (ja) | 2002-11-29 | 2002-11-29 | データ記録再生装置及び、データ記録再生方法 |
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US11/041,248 Continuation US7430702B2 (en) | 2002-11-29 | 2005-01-25 | Data recording/reproducing apparatus and data recording/reproducing method |
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US (2) | US7430702B2 (ja) |
EP (1) | EP1566804A4 (ja) |
JP (1) | JPWO2004051650A1 (ja) |
KR (1) | KR100591973B1 (ja) |
CN (1) | CN100432945C (ja) |
AU (1) | AU2002354137A1 (ja) |
WO (1) | WO2004051650A1 (ja) |
Cited By (1)
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JP2008112516A (ja) * | 2006-10-31 | 2008-05-15 | Fujitsu Ltd | 誤り訂正回路及び情報再生装置 |
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CN101325971A (zh) * | 2005-12-07 | 2008-12-17 | 米德列斯公司 | Ctla-4抗体剂量递增方案 |
US7747925B2 (en) * | 2006-03-06 | 2010-06-29 | Fujifilm Corporation | Apparatus and method for error correction code striping |
TWI415118B (zh) * | 2006-03-10 | 2013-11-11 | Ibm | 將資訊嵌入資料之裝置 |
US7984367B1 (en) * | 2006-07-25 | 2011-07-19 | Marvell International Ltd. | Method for iterative decoding in the presence of burst errors |
JP4932505B2 (ja) * | 2007-01-19 | 2012-05-16 | ルネサスエレクトロニクス株式会社 | 光ディスクコントローラ及び光ディスクドライブシステム |
JP4946844B2 (ja) * | 2007-12-13 | 2012-06-06 | ソニー株式会社 | 記録再生装置および記録再生方法 |
KR100988325B1 (ko) * | 2008-10-10 | 2010-10-18 | 포항공과대학교 산학협력단 | 광학 미디어 상에 오류정정부호를 이용한 데이터의 분산 기록 방법 |
KR101623730B1 (ko) * | 2009-11-23 | 2016-05-25 | 삼성전자주식회사 | 인터리버 장치 |
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Also Published As
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AU2002354137A1 (en) | 2004-06-23 |
CN1650364A (zh) | 2005-08-03 |
KR100591973B1 (ko) | 2006-06-22 |
CN100432945C (zh) | 2008-11-12 |
US7430702B2 (en) | 2008-09-30 |
KR20050074437A (ko) | 2005-07-18 |
US20090031187A1 (en) | 2009-01-29 |
EP1566804A4 (en) | 2008-04-16 |
JPWO2004051650A1 (ja) | 2006-04-06 |
US20050204257A1 (en) | 2005-09-15 |
EP1566804A1 (en) | 2005-08-24 |
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