CN1342972A - Data recording method and equipment, data regeneration method and equipment - Google Patents

Abstract

A data recording and reproducing method and apparatus with which a stable reproduced signal output can be obtained even when overwriting is carried out repeatedly. When recording data to a rewritable recording medium, in scrambling a first data unit 304, scrambling data 12 is prepared using an initial value 13 generated from random numbers and the first data unit 304 is scrambled with this so that the writing data to be written to the recording medium is converted to data different from the data already recorded in the same position on the recording medium. At this time, the initial value from random numbers used to generate the scrambling data is embedded in a reserve area of the recording medium and at the time of reproduction this is used to carry out descrambling. Desired additional information is also included in the initial value and recorded therewith.

Description

Data record method and equipment, data recording method and equipment

Technical field the present invention relates to record information to carrier and from the technology of carrier regenerating information, specifically, relate to and record information to carrier and from the technology of carrier regenerating information, wherein, this carrier can repeatedly rewrite, as phase transition optical disk.

Background technology in recent years, the phase transition optical disk such as 2.6GB DVD-RAM, 4.7GB DVD-RAM and 4.7GB DVD-RW appears on the market, the recording technique in this field is just trending towards more and more higher density.

For the carrier such as DVD-RAM and DVD-RW CD, they are overwriting data repeatedly, and does not resemble the medium of CD-R CD and so on, and this medium are only to write data once.

Yet, have the characteristic that can repeatedly write although DVD-RAM dish waits, but still existence repeats to write relevant problem with this.

For example, to the deterioration that repeats to write caused disk material of coiling same position data recording and Regeneration Treatment can't normally be carried out.As a kind of method that addresses this problem, adopted a kind of method described in the patent announcement No.H.10-49872 of Japanese unexamined.

Along with the increase of density, these problems may become bigger problem.

Be a reason of this problem below.For example in present phase-change recording method, recording sheet (film) is melted when information writes down, and writes fashionablely when repeating data, and the viscosity that this recording sheet is melted part reduces, and recording sheet flows to a certain direction, and the result has changed recording sheet thickness everywhere.The thickness that the amplitude centered level (level) of institute's regenerated signal and amplitude depend primarily on recording sheet.The amplitude centered level of the caused regenerated signal of variation of recording sheet thickness and the fluctuation size of amplitude be very easy to be become greater than the level of the regenerated signal of the shortest vestige (mark), causes signal error to detect.Therefore, appear in the signal of regeneration, and produce shake corresponding to the distortion of recording sheet thickness.When same information is repeatedly write identical position, be same pattern owing to write pattern, so this phenomenon is just more remarkable.

Along with ever-increasing density, this problem may become bigger problem.

And, in these recording mediums, when record data, also has the requirement of many record additional informations, described additional information is for example about the identification code of writing time and recorded contents and the relevant recorded relevant information such as the information of relevant copyright, and will use this additional information to carry out various controls and service.In order to write down these information, on CD, need a recording areas for this reason, so just reduced the free space of record data.

Summary of the invention therefore, an object of the present invention is to address these problems, prevent the localized variation of the film thickness of recording sheet, thereby can carry out good record and regeneration, and provide a kind of method that writes data to recording medium, can write down additional information effectively by this method, it also provides the approach that makes the approach that writes down additional information associated with the data in this way and this additional information of regenerating.

Although waiting, the DVD-RAM dish has the characteristic that can repeatedly rewrite, but owing to data recording and Regeneration Treatment can't normally be carried out to the deterioration that repeats to write caused disk material of coiling same position, when writing down, each different data on data to be recorded, are made the data that write all inequality at every turn by superposition.In order to make data all inequality at every turn, will change initial value so that produce each different scrambled data, and this scrambled data by superposition on data to be recorded.In addition, at this moment additional information is embedded in the initial value and with data and is recorded.

In order to realize this point, in the present invention:

(1) but the data recording equipment of regenerative recording medium has disposed conversion equipment, be used for the data-switching of recording medium to be written being become and being recorded in the different data of the same locational data of this recording medium, and handle is used to carry out this data converted and is recorded in recording medium.

(2) in above-mentioned (1), be used to carry out data converted and be changed so that on data to be written other data of superposition and its no correlativity, and it is changed over all different data of each write operation.

(3) in above-mentioned (2), produce the data of superposition on data to be written as the pseudo random number data sequence, for each write operation, change the initial value that is used to produce pseudo random number, and the initial value that is changed is written into recording medium.

(4) additional information is embedded in the initial value appointed positions and is generated.

(5) but be used for from the method for regenerative recording medium playback of data, carry out data reproduction by the data-switching step, this switch process comprises: come the inverse conversion playback of data from the data based on inverse conversion that are recorded on the recording medium, and detection is embedded in based on the additional data in the data converted.

(6) control Regeneration Treatment according to the additional information that from information, is detected based on the data inverse conversion.

Description of drawings

Fig. 1 is the block scheme of a most preferred embodiment of explanation the present invention;

Fig. 2 is the view that the processing sequence of record data is prepared in explanation;

Fig. 3 is the view of the structure of explanation data field shown in Figure 2;

Fig. 4 is the view of the structure of explanation identification data shown in Figure 3 (sector ID);

Fig. 5 is the view of the structure of explanation reserved area RSV shown in Figure 3;

Fig. 6 is the table of initial value of the shift register of the explanation data that are used for scrambling;

Fig. 7 is the view that the structure of the feedback shift register that produces scrambled data is described;

Fig. 8 is the view of the structure of explanation ECC piece shown in Figure 2;

Fig. 9 is the staggered view of the structure of ECC piece afterwards of description line;

Figure 10 is the view of the structure of explanation the 3rd data cell shown in Figure 2;

Figure 11 be in the explanation most preferred embodiment of the present invention on recording medium the view of the example of the reserved area of recorded information;

Figure 12 is the view of example of the structure of the explanation signal generating circuit that produces scrambled data;

Figure 13 is the block scheme of explanation another most preferred embodiment of the present invention;

Figure 14 is the block scheme of explanation another most preferred embodiment of the present invention;

Figure 15 is the view that explanation writes the data of being modulated the operation of recording medium when the 3rd data cell shown in Figure 10 added the SYNC sign indicating number in proper order;

Figure 16 is the view of the layout of user area and spare area on the explanation DVD-RAM dish;

Figure 17 is the view of the volume structure of explanation DVD-RAM;

Figure 18 is the view of explanation when the example of the structure in data volume hour data district to be recorded;

Figure 19 is the process flow diagram of the flow process of explanation encoding process shown in Figure 2;

Figure 20 is the block scheme of example of the structure of video disc recording and reclaim equiment;

Figure 21 is the record of explanation another most preferred embodiment of the present invention and the block scheme of reclaim equiment;

Figure 22 is the view of example of the structure of explanation initial-value generating unit shown in Figure 21;

Figure 23 is the process flow diagram of the concrete example of explanation coding step;

Figure 24 is the view of explanation example of the structure of the reserved area of record initial value on recording medium;

Figure 25 is the process flow diagram of another example of explanation coding step;

Figure 26 is the view of example that the method for the 3rd data cell is added initial value in explanation;

Figure 27 is the example of fashionable data ordering is only partly write in explanation when recorded data a view;

Figure 28 is the view of another example that the method for the 3rd data cell is added initial value in explanation;

Figure 29 is the view of another example of the structure of explanation initial-value generating unit;

Figure 30 is the view of another example of the structure of explanation initial-value generating unit;

Figure 31 is the view that the example of the data of being made up of continuous ECC module unit is described;

Figure 32 is the view of another example of method for scrambling among explanation the present invention;

Figure 33 is the view of example of the structure of explanation guidance scrambling shown in Figure 32 (guided scrambling);

Figure 34 is the view of example of structure of the demoder of explanation guidance scrambling shown in Figure 32;

Figure 35 is the view of the data configuration in scrambling and the descrambling among explanation the present invention;

Figure 36 is the example of the system that controls is exported in explanation to the regeneration in a regenerative system shown in Figure 21 block scheme;

Figure 37 is the block scheme of explanation according to the example of the system of embodiment of the invention executive logging control;

Figure 38 is a block scheme, and the example of the structure of the regeneration of most preferred embodiment and recording processing according to the present invention is described under the situation of using same format all the time;

Figure 39 is the block scheme that the example of the structure shown in Figure 36 that constitutes integrated circuit is described.

Embodiment

Earlier the main number of using in the accompanying drawing is described.

12 ... scrambled data, 13 ... initial value, 301 ... the ID data, 302 ... ID+IED, 305 ... first data cell, 307 ... second data cell, 308 ... the 3rd data cell.

Situation with DVD illustrates most preferred embodiment of the present invention below with reference to accompanying drawings.

The form of the recorded data zone of DVD-RAM at first is described.

Fig. 2 is the block scheme that the processing sequence of record data is prepared in explanation.

According to the stage that signal Processing arrived, data are known as first data cell 305, second data cell 307 and the 3rd data cell 308, and carry out the processing of preparing record data according to processing sequence shown in Figure 2 (coding flow process).

Fig. 3 illustrates the structure of first data cell 305.

As shown in Figure 3, first data cell 305 is data of 2064 bytes, comprises the identification address information and the 4 byte error-detecging codes (EDC) of sector mark data (sector ID) comprising master data, 12 bytes of 2048 bytes, is made up of 12 row, 172 bytes.6 byte RSV (reservation) as shown in Figure 2 in 12 byte identification address information, have been increased.After EDC calculated, scrambled data was added in the 2048 byte master datas of first data cell 305.And,, carry out staggered Rui De-Suo Luomen (Cross-Reed-Solomon) error correcting code coding through forming 16 first data cells 305 of ECC (error correcting code) piece.By increasing PO (parity checking of outer sign indicating number) and PI (ISN parity checking) and interlocking after the ECC coding obtaining second data cell 307.In by 16 first data cells, 305 formed ECC pieces, generate PO and PI.The 3rd data cell 308 is to have second data cell that the head of per 91 bytes is added with synchronizing signal (SYNC sign indicating number).

Fig. 4 is a block scheme, and the example of identification data ID (sector ID) 401 is described.

Among the figure, identification data ID401 is made up of 1 byte sector information (data field information) and 3 byte sector number (data word segment number).

Sector auxiliary information 405 comprises sector formation type information 407, tracking information 408 and the reflectivity information 409 etc. of dish.It comprises that also the area type information 411 of expression data area and importing/export area, expression are a playback of data or the level number information 413 of data type information of interpolation/overwriting data 412 and indicating panel layer.Sector number 406 is sequence numbers of distributing to the data area, and 030000h is assigned as the reference position of data area.EDC 404 among Fig. 3 is the check codes that are attached to 2064 preceding byte data unit of scrambling.Adopt this EDC sign indicating number 404, can check scrambling whether correct, and after carrying out error correction, whether check has carried out incorrect correction.

Fig. 5 is a view, the example of the RSV 403 of data area in the key diagram 3.As shown in the figure, at present all 48 all be retained.

Fig. 6 illustrates the initial value of shift register, and Fig. 7 explanation is used to generate the circuit that master data is carried out the scrambled data of scrambling.Adopt initial value shown in Figure 6 to generate scrambled data.Initial preset number among Fig. 6 is corresponding to 4, i.e. the b7 to b4 of sector ID.That is to say,, then generate identical scrambled data if sector ID does not change.

Fig. 8 is a view, and the example of the structure of ECC piece is described.

Among the figure, the ECC piece is made up of 16 " data fields " 305 as information field through scrambling.Adopt 172 bytes * 192 row promptly to be equivalent to 172 bytes * 12 row * 16 (data fields) and be used as information field, the outer sign indicating number of 16 bytes parity checking PO 502 is added to each row of 172 row, so that form the outer sign indicating number of Reed-Solomon RS (208,192,17).Then, 10 byte ISN parity checking PI501 are added to all 208 row (=192 row+16 row), comprise PO 502, so that form Reed-Solomon RS (182,172,11) ISN.ECC piece shown in Figure 8 is interlocked, is modulated and is recorded on the dish.After this interlocking, as shown in Figure 9, skewer is gone into the outer sign indicating number of 16 row parity checking PO, and wherein per 12 line data zones are corresponding to the delegation among the sign indicating number parity checking PO outside 16 row.Each 13 row * 182 byte after the line interlacing in the ECC piece partly are known as second data cell 307, and as mentioned above, it is meant that the ECC piece after the line interlacing is made up of 16 second such data cells 307.

Fig. 9 is a view, the example of the structure of ECC piece after description line is staggered.Among the figure, by second data cell 307 of 13 staggered row * 182 bytes (=2366 byte) of order modulation, since the 0th row, each delegation added 2 SYNC sign indicating numbers (synchronous code) simultaneously before the 0th and the 91st row, just can constitute the 3rd data cell 308.As shown in figure 10,1 the 3rd data cell comprises 13 * 2 SYNC frames, is made up of (2B+91B) * 13 row * 2 * 16 (figure place of every byte)=38688 channel bit.Be recorded in 8/16 modulation that also has on the dish, so that 8 input data-switching are become 16 channel bit codes.The SYNC code combination as shown in figure 10.The head of each the 3rd data cell can be specified by SY0 (SYNC sign indicating number " 0 "), and every row specified by SY1 to SY4, SY5, SY6 and SY7, and wherein SY1 to SY4 repeats periodically.Group to 16 the 3rd data cells is carried out error correction: the id information of following the SY0 of each the 3rd data cell 308 is read into, and build can be identified by 16 places, address that eliminate at each.Therefore, a SY0 of the 3rd data cell is very important in digital coding.In sector strucre shown in Figure 10, because row can be designated, if the number row is read, by adopting its periodicity, the position that can also predict SY0.

Fig. 1 illustrates a most preferred embodiment of the present invention, and it applies to data are encoded and the recording method of record data.The assembly that has the reference number identical among Fig. 1 with Fig. 2 have with Fig. 2 in the identical structure/function of its corresponding assembly.

This most preferred embodiment is a kind of method, wherein, all the correlation technique with shown in Figure 2 is identical for the technology of first data cell 304 before scrambling, yet, aspect the processing of the master data that scrambled data is added to above-mentioned DVD-RAM form, scrambled data is not to adopt the initial value from sector ID shown in Figure 6 to generate, but generates by the initial value among Fig. 1 13, wherein initial value 13 be generate at random and be used to generate the scrambled data of waiting to be added on the master data 12.The initial value that is generated is recorded in the reserved area 11 of recording medium, and this initial value can be read out and use once more and generate same scrambled data when regeneration.

Figure 11 is a view, the example of the reserved area of recorded information on the declare record medium.

Fig. 5 illustrates the structure in a reservation (RSV) district, wherein, all is decided to be the reserved area from all positions of b0 to b47.To this, example shown in Figure 11 is a kind of like this example, and wherein, these 16 of b0 to b15 are used to provide the zone of record scrambled data initial value.In this most preferred embodiment, although the zone of record initial value is decided to be 16 zones of b0 to b15, the present invention is not limited to this, only needs the initial value of scrambled data to be recorded at least one position in relative.And the zone of record scrambled data initial value is not limited to this CPR-MAI, and it can be any recorded data zone.Initial value itself is with check code, is used to check whether read correct initial value.

Figure 12 is a view, and the example of the structure of the signal generating circuit that generates scrambled data is described.

This example is known as M series of signals generative circuit, and by determining shift register length (m) and tap number (n), macrocyclic relatively signal can be generated, and this can be used as pseudo random number.A plurality of EXOR can be provided.Best, in order to reduce the possibility that generates identical data, even when power supply is cut off, the generation of this scrambled data is not reset, and it just constantly is updated from being set up beginning at first.

Figure 13 is a view, and another most preferred embodiment of the present invention is described.

This most preferred embodiment is a kind of method, wherein, also independent scrambled data 14 is added in the correlation technique form shown in Figure 2.Just just can adopt this method, and not need to change the circuit that is used for related art method by the interpolation that only adds new scrambled data.At this moment, because newly-generated scrambled data must be different from the scrambled data of correlation technique, so shift register length and tap number just are different from the scrambled data generative circuit of correlation technique.The initial value of scrambled data can adopt random number to generate, and wherein, random number can change when writing down at every turn, for example, when using preceding 2 bytes (16) of user data, does not just need the zone of new storing initial value.

Figure 14 is a view, and another most preferred embodiment of the present invention is described.

This most preferred embodiment is a kind of method, wherein, after the 3rd data cell 308 constitutes with 16 collection according to correlation technique form shown in Figure 2, also adds independent scrambled data.The result who adds is exactly the 3rd data cell 15 of 16 scramblings.Just be added to the integrated circuit that is used for related art method, just can adopt this method, and do not need to change integrated circuit output by interpolation with new scrambled data.The initial value of scrambled data is stored in reserved area 16.At this moment because newly-generated scrambled data must be different from the scrambled data of correlation technique, so shift register length and tap number just with the scrambled data generative circuit of correlation technique in different.

Figure 15 is a view, and explanation is added to the SYNC sign indicating number operation of the 3rd data cell 308 shown in Figure 10 when sequentially modulated data being write recording medium.

Different data are written into the user data part, as mentioned above, but as the SYNC in the user data and sector ID and IED (ID error-detecging code), write identical data at every turn.Therefore, when writing recording medium, these parts can not be rewritten, and have only the data that write that changed to be recorded., only show SYNC, sector ID and IED herein, but in addition,,, just can not carry out unnecessary rewriting by the control of such execution when writing data variation when very little.And during the data that write before known before writing data, as shown in the figure, control is then carried out by the following method: the part that data not have to change is not rewritten, and writes the differentiated part of data and only write down.By this method, just can reduce and write caused damage.Figure 15 is the example that writes control in SYNC is the data cell of frame of reference position.Yet the invention is not restricted to this, can write control in some other suitable unit, these unit have such as frame unit, sector location, ECC module unit or bit location.

Figure 16 is a view, and the layout of user area and spare area in the DVD-RAM dish is described.

As shown in the figure, the panel mainly is divided into Lead-In Area, data field and the outer peripheral leading-out zone of inward flange, and wherein, the data field is divided into section, and section 0 is to section 23, and each section is formed by user area and spare area.In DVD-RAM,, when having defective on the dish,, each user area supplies a gap for providing the spare area in order to ensure the reliability of data.The information of fault location is recorded twice at Lead-In Area tail and leading-out zone head.Carry out upgrading this defect list when defective remedies processing at every turn, because except that the defective that increases newly, write data and do not change, so described as above-mentioned example, only record writes the part that data have changed.

Figure 17 is a view, and the volume structure of DVD-RAM is described.

Among the figure, VRS (volume recognition sequence), VDS (Volume Descriptor sequence) and LVIDS (Logical Volume Integrity Descriptor sequence) are arranged in the volume structure.The VRS administrative standard is expanded, and has write down the standard identifier NSR02 of ISO/ICE 1344 defineds in DVD-RAM.VDS manages volume structure, the interference that occurs in the LVIDS management logic volume, and the recovering information after the fault is recorded.Have some fields all to be rewritten when rewriteeing a file each in volume management information, these fields always can be rewritten relating in the various operations that write such as document creation/upgrade/delete/duplicate etc. at every turn.Therefore, this zone runs into heap file rewriting and damage dish.For this reason, also carry out control in accordance with the following methods: the part that data do not have to change is not rewritten, and only record writes the part that data have changed.Also management information is carried out scrambling, and it is all inequality at every turn to write data.By this method, just can reduce and write caused damage.In addition, these management information can not be rewritten when each operation, but remain in the storer of equipment, and when dish changes, during outage or when data are preserved with predetermined space, be rewritten, so that the minimizing number of rewrites.If it is constant that state management information in the past is maintained in the storer,, can realize recovering even management information is not correctly write.

Figure 18 is a view, illustrates when data volume to be recorded example than the structure of hour data cell.

Because data are converted into 2064 byte datas, comprising 2048 byte master datas, such as the 12 byte identification address information and the 4 byte error-detecging codes (EDC) of sector ID, as shown in Figure 3, when data volume to be recorded during less than 2048 bytes, partial data does not change beyond the master data, even and in the scrambled data shown in Fig. 6 and 7 by after superposition is on it, it becomes and identical data in the past.For this reason, when data volume to be recorded during less than 2048 bytes, known random data is added, and makes it reach 2048 bytes.

Herein, suppose seldom occur data volume to be recorded just in time with former identical situation, only need a known random data sequence, and when this DS occurred, data subsequently can be regarded as unnecessary data.Because in shown in Figure 8, data to be recorded are 16 data grouping of cells, according to the same procedure in the above-mentioned example, when data volume to be recorded hour, can obtain identical effect by embedding given data.Do like this, just can prevent that same data are written into identical position, and need not to prepare again the initial value that a zone is used for writing down random data series.

In above-mentioned most preferred embodiment, the situation of DVD recording medium has been described; Yet the present invention is not limited to this, and it can apply to any carrier, is by with the radiation heat fusing recording sheet of energy beam and change its atomic arrangement and carry out the information record when adopting this carrier.The present invention can also be applied under the situation that recording medium is light-card etc.As the beam that is used to produce heat and melts the recording sheet that is used to write down, the present invention is not limited to laser beam, but can adopt any energy beam that can melt recording sheet.When beam was laser beam, the present invention did not limit the wavelength and the type of laser beam.Relatively during short wavelength laser, can easily realize high density recording when using such as blue laser or ultraviolet laser etc.

Figure 19 is a process flow diagram, and the flow process of encoding process shown in Figure 2 is described.

Figure 20 is a block scheme, and the example of the structure of video disc recording and reclaim equiment is described, is the DVD-RAM driver among the figure.

In Figure 20,2123 expression CDs; The optical sensor of the data of 2112 expression reading and recording on CD 2123; The Spindle Motor of 2113 expression rolling discs; 2114 expression laser drivers.Servo-drive system 2116 control optical sensors etc.Read-out channel 2115 is for carrying out wave shape equalization, binaryzation and synchronous clock generation from coiling the 2123 simulation regenerated signals of reading; 2118 pairs of institutes of demoder sense data is carried out the processing such as separating the mediation error correction; RAM2119 temporarily stores data.When data were written into, scrambler 2117 was carried out the processing such as modulation and error correcting code interpolation.The integrated circuit of reference number 2120 expression digital signal processing; The interface of the data input-output control of relevant epigyny device (higher device) is carried out in 2121 expressions; The microcomputer of 2122 expression control system.

Because this structure adopts the example of the DVD driver be connected to personal computer, so interface 2121 also represent and being connected of personal computer and the example that is connected with MPEG (Motion Picture Experts Group) plate or HDD (hard disk drive) of conduct.Certainly, the record and the structure of reclaim equiment are not limited to this, and the device that it connected can be that receiver or other image/sound that resembles STB (set-top box) and so on writes down and regenerating unit, and this device there is no particular limitation.The encoding process that forms the 3rd data cell 308 shown in Figure 2 is undertaken by scrambler 2117.The part that the present invention relates to signal Processing is specifically related to the processing undertaken by scrambler 2117 and demoder 2118.The method and apparatus of this processing will be described now.

Figure 21 illustrates the most preferred embodiment of the method according to this invention, and wherein, record data are by scrambling, and additional information is embedded in the initial value of scrambling, and is recorded on the recording medium, during regeneration from being detected additional information the data of scrambling and the initial value.

In Figure 21, reference number 2211 expression random numbers, the additional information of the relevant record data that 2212 expressions are embedded is as copyright information.Initial value 2213 generates from random number 2211 and embedding information 2212, and these pieces are generically and collectively referred to as initial value and generate piece 2214.Predetermined random number generates formula 2215 and produces scrambled data 2216 according to the initial value that initial value generation piece 2214 is generated., generate in the piece 2214, when data are recorded, for the scheduled unit generation initial value of record data, so that make the record data randomization at initial value herein.In correlation technique, as shown in Figure 6, for the initial value of shift register, because initially preset number is corresponding to 4 b7 to b4 of sector ID, if sector ID does not change, scrambled data also will be generated as identical data so.Because sector ID corresponding to the address on the dish, in the same position of dish, always generates same scrambled data, and when master data is identical, on dish, all write down same data at every turn.For fear of this point, just need write different data at every turn.

Reference number 2217 expression record data.The error correction parity checking that the front and back that are used to write down are not shown among the figure generates and modulation.Totalizer 2218 with scrambled data 2216 superpositions on record data 2217, but and be recorded on the regenerative recording medium 2220 with predetermined form by this addition with based on the data 2219 that initial value generates the scrambling that information produced of the initial value that piece 2214 generates.A kind of method has been described here, and this method is by generating random number series and coming data are carried out scrambling as scrambled data 2216 with it; But, also have other to generate the method for scrambled data, the present invention is not particularly limited used method, as long as it is a kind of like this system, wherein, when data are written into, each scrambled data all inequality is generated, and the initial value of this scrambled data is written in the dish.

Next the regenerative system of Figure 21 will be described.

Be recorded in the data that data on the recording medium 2220 are regenerated as has increased scrambled data (usually, include before this and afterwards and separate the mediation error correction, but herein, be not shown).Detect 2222 by initial value, from the data 2221 of the scrambling that is reproduced, detect the initial value of the scrambled data that when record, is increased.Herein, the data of error detection can be added in the initial value, and in this case, obtain initial value after carrying out error detection or error correction.The initial value that is detected shows scrambled data series, uses it to carry out the data 2224 of descrambling 2223 and acquisition regeneration.And, detect 2225 by embedding information, detect from initial value and detect embedding information 2222 initial values that detected, and obtain embedding information 2226.

Figure 22 is a view, illustrates that initial value shown in Figure 21 generates the example of the structure of piece 2214.Here a kind of situation will be described, in this case, when the initial value that will generate 15, embedding information be embedded into least significant bit (LSB) d0; Yet, the figure place of initial value and embed bit position, length, pattern and be not limited at these of this explanation.

In Figure 22, when carrying out the initial value generation, random number 2211 is added among 14 d1 to d4 at every turn.Embedding information is coupled with according to the series of the n bit data of for example pattern 1, and " 0 " is added into for the first time, is " 1 " then, then is " 0 ", or the like.As a result, it is " xxx xxxx xxxxxxx1 " and then be " xxx xxxx xxxx xxx0 " again that the initial value that is generated was generated as before this " xxx xxxx xxxx xxx0 ", or the like (wherein, x represents " 0 " or " 1 ").After n initial value was generated like this, a series of n bit data were embedded into the position of the d0 that puts in place.And,, can generate the initial value of the data that comprise the pattern of forming by reverse mode 12 by same mode.Pattern 1 of Sheng Chenging or pattern 2 are embedded in the initial value of predetermined period like this.By repeatedly repeating this embedding, the detection of mistake may tail off.And if pattern 1 and pattern 2 alternately embedded, even data are recorded in same position repeatedly, but owing to have the data of the different scrambled data that is added into and be recorded, so record produces less damage.

Regeneration side, when initial value is detected, be embedded into d0 if know pattern 1 in advance, then the information of embedding can be detected, if but embedded location, pattern and cycle can not know in advance, embed information so and just can't obtain.When 15 initial value shown in Figure 22 is generated, scrambled data is that the basis is generated and least-significant byte when being added to record data with these initial values, this method can be used, and only needs existing DVD scrambling circuit and initial value thereof are carried out a spot of circuit change.In this case, initial value shown in Figure 6 just no longer needs, but generates when writing down and at the different initial value of disc recording at every turn.

Figure 23 illustrates the example of the treatment step of this method.For Figure 19, by the record data scrambling of carrying out in step 250, ID, IED and master data are by scrambling, and simultaneously in step 251, initial value is written into RSV (reservation).

, only adopt the mode detection of a series of n bit data herein, have the possibility of certain detection that makes a mistake.Therefore, need be by for example when writing down, making the number of times that modal length is long or regularly it is embedded repeatedly and determine the number of times that detection is continuous or confirm at least to detect in the certain hour when detecting, to improve reliability.By this method, although make detection time long, can prevent wrong detection.This combines with the result of correcting data error, if revise impossiblely, this position is not used to then confirm that perhaps on the contrary, it is confirmed as any.When the number of times of the length of designated mode or repetition changes according to the importance of data, the error-detecting of significant data just still less, can promptly control at short notice can be detected data.When the information that embeds was detected, although do not illustrate among the figure, testing result can show on display.

The example in Figure 24 explanation zone of record initial value in the reserved area of recording medium 2220.

In example shown in Figure 24,24 of b0 to b23 are used to write down the initial value of scrambled data and are used to detect the wherein check code of any mistake.

Herein, in this most preferred embodiment, the zone of record initial value is 16 the zone of b8 to b23, and error check code is 8 of b0 to b7; But the present invention is not limited to this bit position, can satisfy the demand so long as the initial value of scrambled data can be recorded in it any zone of at least one unit.And the record initial value of scrambled data and the zone of error check code are not limited to RSV, can be can record data any zone.The initial value zone is 16 zones, is used for 15 initial value shown in Figure 22, wherein provide 1 reservation, but the figure place of initial value and check code is not limited to this.Certainly, also can not add error check code.When initial value is recorded in RSV (reservation) when district like this, owing to also be at first to read under the situation of initial value more easily to carry out descrambling when reading, so in first data cell 305 shown in Figure 3, the conversion mutually of the order of RSV and sector ID, IED.

An example of the treatment step of this moment as shown in figure 25.

Among the figure, with respect to Figure 19, by the sector data scrambling of step 252, ID, IED and master data are by scrambling, and in step 253, initial value is written into RSV simultaneously.By data being carried out scrambling,, do not need error-detecging code is encoded again, and only need carry out the processing that begins from scrambling once more even record failure and record data are used for carrying out once more record by scrambling again by this order.

Figure 26 illustrates that initial value is added to the example under the second data cell situation of DVD shown in Figure 9.

In Figure 26, initial value 0 to 15 is added to the head of 16 first data cells shown in Figure 9 to form second data cell., as mentioned above, embed initial value 0 to 15 herein, just can embed the series of 16 data by pattern with pattern shown in Figure 22 1 or pattern 2 and so on.Certainly, the quantity that initial value is added into unit wherein can many or few than shown here, and aspect the interval, they also need not be continuous, and can be in the predetermined unit.For example, embedding information can only be embedded in the initial value of even number second data cell.Be added into wherein unit for initial value, will and be in before the scrambled data with the close position of the data of this initial value scrambling if initial value is placed on, the processing of then using this initial value to carry out descrambling can be easier to carry out.But if adopt a kind of method, wherein initial value is at first read and is stored in advance in the memory block that for example offers initial value, does not so just need this initial value is placed on the close position.

Figure 27 is a view, and the situation that record data are carried out rewriting of only partly replacing is described.

Among the figure, for example when the master data of sector number 3 will be rewritten and be recorded in same position, because embedded pattern can not detect embedding information simultaneously, the value identical with the value of former institute logging mode is recorded.For example, if the former pattern that writes down is " xxxx xxx1 ", so only the d0 position is processed into same value, provides once more " xxxx xxx1 ", and for other position, the initial value employing is different from former random data and produces.By this method, because modulated back logging mode is inequality, just can when keeping the scrambling effect, write down embedding information.

Figure 28 is a view, and the example of data configuration when initial value has been added to the 3rd data cell 308 of structure shown in Figure 10 is described.

Among the figure, the initial value of I0 to I25 is added to after the synchronizing signal, and is recorded with data., as previously mentioned, embed in the initial value of I0 to I25 herein, just can embed the series of 26 bit data by pattern with type shown in Figure 22.Certainly, the quantity that initial value is added into unit wherein can many or few than shown here, and aspect the interval, they also need not be continuous, and can be in the predetermined unit.For example, embedding information can only be embedded in the initial value of even number SYNC frame.

Like this, use the example of existing DVD data configuration to understand an example of record initial value, and illustrated the method in a kind of pattern embedding initial value; Yet, the pattern consistent with the generation of pseudo random number can be embedded pseudo random number wherein and be recorded in any system on the recording medium, and be not only the DVD data configuration with record data.Initial value preferably is recorded in the data cell of the scrambling of having added the scrambled data that generates based on these initial values, and preferably is recorded in before the data of scrambling.

Figure 29 is a view, and another example of the structure of initial value generation piece 2214 among Figure 21 is described.

This figure illustrates a kind of situation, and in this case, when generating under 8 the situation of initial value, embedding information is embedded among the least significant bit (LSB) d0, but unit, length and the pattern of the figure place of each initial value and embedded position be not limited to shown in the figure like that.Each when carrying out initial value and generating, random number 11 is generated and is added to 7 of d1 to d7.Embedding information is added to a d0 as for example series of n data of pattern 1, and at first " 0 " is added into, and is " 1 " then, then is " 0 ", or the like.As a result, the initial value that is generated is generated, and " xxxx xxx0 " before this is " xxxx xxx1 " then, then is " xxxxxxx0 ", or the like (wherein, x represents " 0 " or " 1 ").After n the such generation of initial value, the series of n data be embedded into this n initial value the position d0 the unit in.

Figure 30 illustrates another example of the structure of initial value generation piece 2214 among Figure 21.

Herein, position d0 and position d4 be for embedding information bit, and remaining position is used for the initial value be made up of random data.Embedding the unit of position and the pattern and the length of quantity and embedding data herein, also is not limited thereto certainly.For example form 01 → 10 → 00 → 11 by embedding position d0 and d4 → ... like pattern a, just 2 bit patterns can be embedded in the single initial value.Embedding the unit can change in time by predetermined sequence, for example earlier a pattern is embedded position d0 and then a pattern is embedded position d4.

In the regeneration side, when detecting initial value, be embedded among d0 on the throne and the d4 if know mode designated in advance, the information of embedding can be detected so, if but do not know in advance embedded unit, pattern and cycle that the information of embedding can't obtain so., the situation that embeds the pattern among the d0 on the throne may occur only knowing herein, the situation that embeds the pattern among the d4 on the throne perhaps occur only knowing, or occur not only knowing the pattern among the d0 on the throne that embeds but also knowing the situation that embeds the pattern among the d4 on the throne.Because the information that is obtained is all inequality in each case, therefore can carry out different control, and different significance levels can be affixed in the information.By this method, just can carry out such as of the control of factors such as recording/reproducing time, number of times and quality in conjunction with a plurality of restrictions.

In addition, by at first embedded pattern being sent to the regenerative system side from position d0, and then use a position d4 to come the change pattern where necessary, can also change embedding information.

An example has been described herein, and wherein, information is embedded among 2 of each initial value, but figure place is not limited to this.And, be embedded in 8 the initial value when 8, change the initial value formation sequence by value with appointment, also can make it have specified message.

The example of the data that Figure 31 explanation constitutes in the unit of ECC piece shown in Figure 9 continuously.

Among the figure, if initial value will be recorded in the RSV zone this moment, can adopt the position of record sector to construct mode designated so, for example be recorded in the d0 position of the initial value among the RSV of piece 1, be recorded in the d0 position of the initial value among the RSV of piece 2, be recorded in the d0 position of the initial value among the RSV of piece 3, and the d0 position that is recorded in the initial value among the RSV of piece 4.At this moment, if these positions are inverted in the mode of " xxxx xxx0 ", " xxxx xxx1 ", " xxxx xxx0 ", even the random number that is generated is identical by chance, so different initial values also are generated, and the scrambled data series that is generated can be inequality.

Figure 32 explanation is according to another method for scrambling of the present invention.

Method shown in Figure 7 is a kind of like this method, and wherein, M series generator adopts initial value shown in Figure 6 to produce scrambled data, and the front has illustrated a kind of method that at every turn changes initial value by method similarly.In example shown in Figure 32, produce random data with M series generator 271 in advance, and it is added in the record data 17, so that produce the record data of the random data 273 that comprises interpolation by totalizer 272.These record data that comprise the random data 273 of interpolation pass through second scrambling circuit 274 by scramblings once more, so that produce the record data 276 of scrambling.The process of the data of having added random data being carried out second scrambling 274 is known as " guidance scrambling " 275.

Figure 33 illustrates the example constructions of Figure 32 midcourse guidance scrambling 275.Herein, scrambled data generates according to primitive polynomial P (X)=X8+X4+X3+X2+1.Among the figure, reference number 277 expression input data, 279 to 286 expressions keep the register of 1 bit data, common 8 bit shift register of forming of these registers.Reference number 278 and 287 to 289 expression totalizers, 290 is the scrambled data that is generated.

Among the figure, 8 random data are added to shift register as initial value, when input data 277 are transfused to, produce scrambled data 290.Adopt this method, the propagation of mistake drops to 8, and therefore, even the regeneration of initial value failure, data subsequently can be decoded.

Figure 34 illustrates the example of structure of the demoder of Figure 32 midcourse guidance scrambling 275.Herein, 291 expression input data, 292 to 299 for keeping the register of 1 bit data, common 8 bit shift register of forming of these registers.Reference number 260 to 263 expression totalizers, the data of 264 expression scramblings.

In this figure, 8 initial values are added in the shift register, and when input data 291 are transfused to, produce the data 264 of scrambling.

Figure 35 is a view, and the data configuration of scrambling shown in Figure 32 to 34 and descrambling is described.

In this figure, during scrambling, 8 arbitrary datas are added in the raw data as initial value, so that generate scrambled data, and when descrambling, use initial value to produce raw data from scrambled data, remove initial value then, have only raw data to be transmitted.By using this scrambling and de-scrambling method, can carry out the exchanges data of few error propagation, and owing to initial value is added when writing down and is removed when regenerating, so be difficult to analyze or distort.

The example of the system that the output that Figure 36 explanation is regenerated to the regenerative system of Figure 21 is controlled.Herein, 2231 represent to control according to the embedding information that is detected the unit of output, and 2232 is output terminal.

Herein, when being uncertain of embedding grammar and being embedded model and cycle etc., the information of embedding can't be embedded into.Therefore, if when guaranteeing correctly to control the embedding grammar of embedding information, just know embedding grammar, just can judge that the record data that write down with the embedding information of being added are recorded when correctly being carried out for the control relevant with the control of information embedding.Therefore, just might use this embedding information correctly to carry out control.And, the restricted information of relevant regeneration is included in the embedding information, for example when comprising regeneration period or regeneration times (reproduction number) or during such as the quality of the output rating (output rate) in when regeneration or sampling frequency or video scan lines number or ratio of compression, output also is consistent.For example, when embedding information can't be read, only allow a regeneration, but, just can provide a kind of service, the regeneration number can be increased when having used to detect the equipment of embedding information the time.Like this, have and to be added the valuable embedding information of user.

Figure 37 explanation is used to detect above-mentioned embedding information and according to the example of the system of this information and executing record controls.Herein, 2250 is input signal, such as the data of regeneration or the signal that certain communication/conveyer received etc., the embedding information that 2251 expressions are detected is the information of authority record, by this unit, when needs upgrade embedding information (being the embedding information updating that only allows a recording/reproducing when no longer allowing the embedding information of record for example), institute's updated information is delivered to embedding information and generates piece 2214.The data 2224 of regeneration are normally identical with record data 2217, but since sometimes these data be different, for example when the quality of change playback of data 2224 when forming record data 2217, so they are listed respectively.And output control 2231 is represented as control module, is used to stop the data 2224 of record regenerating.When embedding information detects the 2225 embedding information that detected is when authorizing once more the information of record, for example when allowing to reach twice record, if expression is that the embedding information that had been recorded signal once is added, because this signal can be recorded again, so, playback of data 2224 is as record data 2217, and executive logging is handled.At this moment, produce next embedding information, the expression record has been performed twice, upgrades embedding information, so that can not carry out record again.In output control 2231, when the data 2224 of regeneration are output as record data 2217, if necessary, then carry out processing such as the speed exchange of these record data.

In above-mentioned most preferred embodiment, the situation of the recording medium of DVD has been described, but the present invention is not limited to this, it can apply to any carrier, is by with the radiation heat fusing recording sheet of energy beam and change its atomic arrangement and carry out the information record when adopting this carrier.The present invention can also apply under the situation that recording medium is light-card etc.As the beam that is used to produce heat and melts the recording sheet that is used to write down, the present invention is not limited to laser beam, but can adopt any energy beam that can melt recording sheet.When beam was laser beam, the present invention did not limit the wavelength and the type of laser beam.When the relative short wavelength laser that uses such as blue laser or ultraviolet laser, just can easily realize high density recording.

Figure 38 illustrates a kind of regeneration and recording processing of situation, in this case, not only in can writing down the recordable recording medium of above-mentioned embedding information format, and for prerecorded medium, all can adopt identical record format to regenerate and recording processing, and in data transfer, also adopt identical form.Reference number 2273 expression Data transmission, 2274 is that the information of being added detects, and carries out same embedding information and detect.By this unit, can carry out processing by same regeneration treating method.

Figure 39 is an example of having made the structure shown in Figure 36 of integrated circuit.When regenerative system and register system are established as similarly same configuration with will be when the part of the control that detects regeneration output that embeds information is made regenerated signal processing integrated circuit 2271 as a piece, data just are difficult to analyze.And when the control that is embedded into record from embedding information is made into tracer signal processing integrated circuit 2272 as a piece, just can't distorts the part approach and handle (the processing part-way through).And when regenerated signal processing integrated circuit 2271 and tracer signal processing integrated circuit 2272 united two into one, this function can also further strengthen.

Now, as the using method of the information of embedding, concentrate authorization message to be illustrated to control and copyright protection; But the present invention is not limited to this.For example, if embedding information is such as information such as start-of-record time and end of record (EOR) time, program title and passages, it can also be used for so-called band navigation so.Especially when it is used as the G sign indicating number when writing down, because can also be consistent with programme information, so be easy to use.

In addition, the author of record data can also embed necessary information.Promptly write down control, regeneration zone constrained code, record and regeneration condition, resolution and the compressibility etc. in number of times and cycle.And can also information be embedded into by the setting that the user carried out of writing down.The condition that is provided with of writing time can embed with designated mode.The manufacturer of recording unit also can embed information.For example, different numberings can be assigned to every recording unit, and embeds by numbering as information, just can specify the equipment that is used to write down.

And the information of relevant user's functions of use can be placed on user data area, and relevant information of managing can be placed on the part of non-user data area, for example management information.

As mentioned above, adopt the present invention,, can realize the stable data record, and can obtain stable distortionless regenerated signal or eliminate the regenerated signal of its distortion effectively even carry out the write operation that repeats.

In addition, the initial value that is used for conversion can be used to write down additional information.

Claims (43)

1. data record method that is used at rewritable recording medium identifying recording layer, it may further comprise the steps:

The data that data-switching becomes to be different from the data in the same position that is recorded in described recording medium that write with described recording medium to be written; And

But at regenerative recording medium identifying recording layer.

2. data record method that is used at rewritable recording medium identifying recording layer, it may further comprise the steps:

The information that is produced according to data-switching information by superposition is thereon treated the data that are recorded on the described recording medium and is carried out data-switching; And

The data of described data-switching information of record and described data-switching on described recording medium.

3. according to the data record method of claim 2, it is characterized in that described data-switching information is the initial value that changes when at every turn writing down.

4. according to the data record method of claim 3, it is characterized in that described initial value generates pseudo random number.

5. according to the data record method of claim 2, it is characterized in that additional information is embedded in the part of described data-switching information.

6. according to the data record method of claim 5, it is characterized in that when the part of described data is written into, be embedded in the described data-switching information described additional information with rewrite before identical.

7. according to the data record method of right 1, the data that it is characterized in that described data-switching are master data, identification data, error-detecging code and error correcting code.

8. according to the data record method of right 2, the data that it is characterized in that described data-switching are recorded on the described recording medium near the described data-switching recording of information of the record position.

9. data record method that is used at the recording medium identifying recording layer that can repeatedly rewrite, it may further comprise the steps:

The recording instruction that receives is responded, indicate the signal Processing of the data on described recording medium to be recorded;

Described indication is responded, error correction data is added in the described data;

Come the data of such interpolation are carried out data-switching by the information that superposition is thereon produced according to data-switching information;

Modulate translation data and described data-switching information after such data-switching;

Described data-switching information is recorded described recording medium; And

Described translation data is recorded near the record described data-switching recording of information position.

10. according to the data record method of claim 9, it is characterized in that the initial value that described data-switching information changes when being each the record.

11., it is characterized in that additional information is embedded in the part of described data-switching information according to the data record method of claim 9.

12. according to the data record method of claim 9, the data that it is characterized in that described data-switching are master data, identification data, error-detecging code and error correcting code.

13. one kind is used for the data recording method of regenerating from recording medium, record data transitional information and carry out the translation data of data-switching in described recording medium wherein by the information that superposition is thereon produced according to described data-switching information, it may further comprise the steps:

Read described data-switching information;

Generate information according to described data-switching information;

Use the described data-switching information of reading and the information of described generation, described translation data is reverted to data before the conversion before the data-switching; And

The preceding data of the described conversion of regenerating.

14. according to the data recording method of claim 13, the initial value that changes when it is characterized in that described data-switching information for each record.

15., it is characterized in that additional information is embedded in the part of described data-switching information according to the data recording method of claim 13.

16., it is characterized in that further comprising the steps of: detect described additional information and control the regeneration of data before the described conversion according to testing result according to the data recording method of claim 15.

17. according to the data recording method of claim 16, it is characterized in that described detection is repeatedly carried out, and control the regeneration of data before the described conversion according to described testing result.

18. according to the data recording method of claim 17, it is characterized in that to a plurality of additional informations each all carries out described detection, and control the regeneration of data before the described conversion according to the result that described additional information is detected.

19., it is characterized in that described translation data is master data, identification data, error-detecging code and error correcting code according to the data recording method of claim 13.

20. but a data recording equipment that is used at regenerative recording medium identifying recording layer, it comprises:

Converter is used for treating the data that are recorded on the described recording medium by the information that superposition is thereon produced according to data-switching information and carries out data-switching; And

Laser sensor is used for the data of described data-switching information and described data-switching are recorded in described recording medium.

21., it is characterized in that described converter is writing on the data superposition other and the incoherent data of said write data, thereby data inequality when the said write data-switching become each write operation according to the data recording equipment of claim 20.

22., it is characterized in that according to the described information that described data-switching information is produced it being to generate from the initial value that is input to shift register and when writing down, change at every turn according to the data recording equipment of claim 20.

23., it is characterized in that described initial value generates pseudo random number according to the data recording equipment of claim 22.

24., it is characterized in that additional information is embedded in the part of described data-switching information according to the data recording equipment of claim 20.

25. according to the data recording equipment of claim 24, it is characterized in that under the situation that described data are partly rewritten, be embedded in the described data-switching information described additional information with rewrite before identical.

26 data recording equipments according to claim 20, the data that it is characterized in that described data-switching are master data, identification data, error-detecging code and error correcting code.

27. one kind is used for data are recorded in data recording equipment on the recording medium that can repeatedly rewrite, it comprises:

Microprocessor is used for the recording instruction that receives is responded, and indicates the signal Processing of the data on described recording medium to be recorded;

Signal processing circuit, be used for described indication is responded, error correction data is added in the described data, come the data of such interpolation are carried out data-switching, modulate the translation data after such data-switching by the information that superposition is thereon produced according to data-switching information;

Laser generates the source, is used to produce recording laser;

Laser sensor is used for the recording laser of described generation is shone described recording medium; And

Servo-drive system is used to control described laser sensor to write down described data-switching information and described translation data.

28., it is characterized in that the information that is generated according to described data-switching information is from be input to shift register and the initial value that changes when writing down generates at every turn according to the data recording equipment of claim 27.

29., it is characterized in that additional data is embedded in the part of described data-switching information according to the data recording equipment of claim 27.

30. according to the data recording equipment of claim 27, the data that it is characterized in that described data-switching are master data, identification data, error-detecging code and error correcting code.

31. one kind is used for the data reproduction equipment of regenerating from recording medium, record data transitional information and carry out the translation data of data-switching in described recording medium wherein by the information that superposition is thereon produced according to described data-switching information, and it comprises:

Laser sensor is used to read described data-switching information and described translation data;

Signal processing circuit is used to the information that adopts the described data-switching information that reads and generated according to described data-switching information, so that described translation data is returned to data before the conversion before the data-switching; And

Reclaim equiment, data before the described conversion that is used to regenerate.

32. according to the data reproduction equipment of claim 31, the initial value that changes when it is characterized in that described data-switching information for each record.

33., it is characterized in that additional information is embedded in the part of described data-switching information according to the data reproduction equipment of claim 31.

34. according to the data reproduction equipment of claim 33, it is characterized in that detecting described additional information, and control the regeneration of data before the described conversion according to testing result by detecting device.

35. according to the data reproduction equipment of claim 34, it is characterized in that described detection is repeatedly carried out, and control the regeneration of data before the described conversion according to described testing result.

36. according to the data reproduction equipment of claim 35, it is characterized in that to a plurality of additional informations each all carries out described detection, and control the regeneration of data before the described conversion according to the result that described additional information is detected.

37., it is characterized in that described translation data is master data, identification data, error-detecging code and error correcting code according to the data reproduction equipment of claim 31.

38. a data record method that is used for rewritable recording medium, it may further comprise the steps:

Data are write fashionable first data that will be recorded in described record matchmaker's writing position and are compared with second data that will newly write identical writing position; And

Result in described comparison comprises under the situation of different pieces of information for described first data and described second data, and described second data are write the said write position.

39. data record method that is used for rewritable recording medium, wherein, the management information in a position of described recording medium to be recorded write data comprise with write described recording medium under the identical data conditions of data in the same position, for described data are identical parts, and the said write data are not recorded.

40. data recording equipment that is used at rewritable recording medium identifying recording layer, wherein, the management information that writes data on described recording medium to be recorded temporarily is stored in the independent storer, and is written into described recording medium in described recording medium when described equipment is removed.

41. data recording equipment that is used at rewritable recording medium identifying recording layer, it comprises the device that is used for given data is superimposed to the management information that writes data to described recording medium to be recorded, wherein, be registered as different management information data during each recording operation.

42. data recording equipment that is used for rewritable recording medium, wherein, data are write fashionable, first data in the writing position that is recorded in described recording medium are compared with second data that will newly be write identical writing position, and comprise under the situation of different pieces of information in described first data and described second data, described second data are written into the said write position.

43. a recording medium that is used for having write down from it the data that convert predetermined format to is come the data reproduction equipment of playback of data, it comprises: output unit, be used for detecting under the situation of given data series, think that described DS is invalid data and it is not exported as playback of data in data from the inverse transformation of having carried out described form; Output unit is used to export the invalid sign of the described data of expression.

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