JP2002298513A - Information medium, recorder, reproducing device, method for controlling access and method for detecting track misalignment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information medium for reproduction which improves commonality on a data structure by performing data scrambling with a data structure similar to that of a rewritable information medium. SOLUTION: Data with a structure in which a first position including a data ID is replaced with a second position including variable contents are recorded in a rewritable information medium, and a data structure (Figure 3 (b)) where a third position (P1 and P2) including the data ID is replaced with a fourth position (P2 and P3) including copyright management information 8a is recorded on an information medium 22 for reproducing. In such a case, the third position ( P1 and P2) and the fourth position (P2 and P3) of the information medium 22 for reproducing take one-to-one correspondence positional relations with the first position and the second position of the rewritable information medium respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an improvement in a recording data structure in an information medium suitable for digital recording and reproduction of high-definition video information and the like. In particular, the present invention relates to an improvement in the format of sector scrambling in a next-generation DVD disk (ROM disk, R disk, RW disk, RAM disk) using a short wavelength laser (blue laser).

[0002] The present invention also relates to a recording apparatus, a reproducing apparatus, an access control method, and an off-track detecting method using the above-mentioned medium.

[0003]

2. Description of the Related Art In a large-capacity digital information medium represented by a DVD disk (ROM disk, R disk, RW disk, RAM disk), information is recorded in sector units (or data frame units). At the beginning of this sector, a data ID (having a certain pattern) for sector identification is arranged, followed by main data (recorded content). Of the data sectors including the data ID and the information of the main data, the main data portion is scrambled (sector scramble). Sector (or data frame) information including scrambled main data is grouped by a predetermined number (16), ECC-encoded, and digitally modulated (8
/ 16 modulation), a synchronization code is added, and the data is recorded in a predetermined number (16) of physical sectors on the disk.

[0004]

When the above-described sector data format is used for recording / reproducing on a medium (RAM disk, RW disk, etc.) which can be repeatedly rewritten, a fixed pattern of data I which is not sector-scrambled.
The D recording portion (which is always at the same physical location) can be repeatedly rewritten on the same medium every time the recording content is rewritten. If this rewriting is repeated many times, the recording / reproducing characteristics of the data ID part are deteriorated due to the material flow or metal fatigue in the medium recording film, and the rewriting life of the medium is shortened. The problem of "reducing the rewriting life" becomes more prominent in next-generation DVDs having a higher recording density (because a smaller area is repeatedly rewritten).

As a method for coping with the problem of shortening the rewriting life, sector scrambling is performed including the data ID at the head of the sector so that the physical recording location of the data ID portion changes every rewriting. It is possible to do. However, if this method is adopted, the actual data structure is different from the conventional read-only DVD video disk (or the R disk once recorded in the video format) in which the data ID portion is not scrambled. Then, the rewritable media (RAM disk, RW
Sector scrambling hardware / software and playback media (ROM disc, R
It is difficult to share sector scrambling with hardware / software used in discs).

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to provide an information medium for reproduction having a data structure similar to a rewritable medium employing a data structure for performing sector scrambling including a data ID. It is an object of the present invention to provide a reproduction information medium in which the data structures of the two are enhanced by applying the sector scramble of the above.

A second object of the present invention is to provide a recording apparatus for performing recording on a medium using a data structure for performing sector scrambling including a data ID.

A third object of the present invention is to provide a reproducing apparatus for reproducing information from a medium recorded with a data structure for performing sector scrambling including a data ID.

A fourth object of the present invention is to provide an access control method for recording information on a medium recorded with a data structure for performing sector scrambling including a data ID.

A fifth object of the present invention is to provide a method of detecting an off-track on a recording track on a medium recorded with a data structure for performing sector scrambling including a data ID.

[0011]

In order to achieve the first object, identification information (data ID) for identifying each information recording unit (sector) and variable contents whose contents can be changed for each rewriting are provided. An information recording unit (22) according to the present invention, which can be used together with a rewritable information medium (21) capable of recording an information group (FIG. 1A) including (3, 4), has an information recording unit ( An information group (FIG. 3A) including identification information (data ID) for identifying each sector and predetermined fixed content information (copyright management information 8a) is recorded.

A first position including the identification information (data ID) (P1 to P2 in FIG. 1A) and a second position including the variable contents (3, 4) (FIG. 1A) P2
To P3) (FIG. 1)
(B)) is the rewritable information medium (21 in FIG. 1 (e))
Under the assumption that the identification information (data ID) is stored at the third position (P1 to P3 in FIG. 3A).
2) and the fourth position (P2 to P3 in FIG. 3A) including the content fixed information (8a) are replaced with the data structure (FIG. 3B) of the information medium for reproduction ( 22)
Will be recorded.

In this case, the rewritable information medium (21)
The first position (P1 and P2) and the second position (P2 and
P3) respectively correspond to the third position (P1 to P2) and the fourth position (P2 to P2) of the information medium for reproduction (22).
The data structure of the information recorded on the reproduction information medium (22) is determined so as to have a one-to-one positional relationship with 3).

Alternatively, an information group including identification information (data ID) for identifying each information recording unit (sector) and specific information (copyright management information 8a, 8b) (FIG. 3A)
In the information medium for reproduction (22) according to the present invention, the position (P1 to PID) of a part (data ID, IED) of the information group including the identification information (data ID) is recorded.
2) a data structure in which the positions (P2 to P3) of the other part (copyright management information 8a) of the information group including at least a part (8a) of the specific information (8a, 8b) are replaced. 3 (b), scrambled data (FIG. 3 (c)) subjected to scramble processing in the information recording unit (sector) is recorded.

In order to achieve the second object, a recording apparatus according to the present invention includes a part of an information group (ID) including identification information (data ID) for identifying each information recording unit (sector). Position of data ID, IED) (P1-P2)
And the positions (P2 to P3) of the other part (copyright management information 8a) of the information group including at least a part (8a) of the specific information (copyright management information 8a, 8b) (FIG. 12) ST08P) Data arrangement partial exchange section (63)
And scrambling the data structure (FIG. 3 (b)) exchanged by the data arrangement partial exchange section (63) in the information recording unit (sector) (FIG. 12).
ST09P) scramble circuit (57); and the scrambled data (FIG. 3 (c)) scrambled by the scramble circuit (57) are transferred to the information medium (2).
2: a recording system (41R) for recording on a ROM disk or R disk).

In order to achieve the third object, identification information (data I) for identifying each information recording unit (sector) is provided.
D), specific information (copyright management information 8a, 8b), main data (6), and information (FIGS. 4 and 6) including a synchronization code (19e) are recorded on a medium (22). The reproducing apparatus according to the present invention, wherein the synchronization code (19) located at the beginning of the recording unit (sector) of the information.
e) detecting and extracting (ST23 in FIG. 13) a synchronous code position detecting / extracting section (45); and the synchronous code (1) detected by the synchronous code position detecting / extracting section (45).
9e) (FIG. 4 (c) (d), FIG. 6 (d)
(F)) is demodulated (ST24 in FIG. 13).
2) and; a data position (FIG. 4 (d) (e)) including the identification information (data ID) in the information contents (FIGS. 4 (c) and 4 (d)) demodulated by the demodulation circuit (52). P2
To P3) and a data position including at least a part (8a) of the specific information (8a, 8b) (P1 in FIGS. 4D and 4E).
To P2) (ST27 in FIG. 13); a data arrangement partial exchange unit (64); and information contents after the data arrangement has been exchanged by the data arrangement partial exchange unit (64) (FIG. 4 (e)). Out of the specific information (8a, 8
The main data (6) following (b4) (after P4) is extracted (ST28 in FIG. 13).
3).

In order to achieve the fourth object, in the access control method according to the present invention, a synchronization code (19a or 19a in FIG. 1D) included in the scramble data recorded on the information medium (21 or 22) is used. 19 in FIG.
The location e) is extracted (ST34 in FIG. 14). And
After descrambling at least to the location where the data ID exists (ST36 in FIG. 14), access control is performed using the information of the descrambled data ID (ST37 to ST42 in FIG. 14).

In order to achieve the fifth object, in the method for detecting an off-track according to the present invention, the synchronization code (19a in FIG. 1 (d)) included in the scramble data recorded on the information medium (21 or 22) is used. Or 1 in FIG.
The location of 9e) is extracted (ST55 in FIG. 15). Then, after descrambling is performed to at least the location where the data ID exists (ST57 in FIG. 15), the off-track detection is performed using the information of the descrambled data ID (ST58 to ST62 in FIG. 15). .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the drawings, an information medium, a recording device, a reproducing device,
An access control method and a track off detection method will be described.

FIG. 1 shows a rewritable information storage medium (DVD-
FIG. 3 is a diagram illustrating a scramble process of sector data written to a RAM disk, a DVD-RW disk, etc. 21.

In the sector recording format used in the current generation of the rewritable information medium, a data ID (4 bytes) for identifying the sector is arranged at the head of a sector (data frame), which is the minimum unit of recording, and thereafter. Data ID
Error detection code IED (2 bytes) is arranged, followed by a reserved area (6 bytes), followed by main data (160 bytes + 172 × 10 bytes + 16)
8 bytes), followed by the error detection code ED.
C (4 bytes) is arranged.

On the other hand, a next-generation rewritable information medium 2
1 in the sector recording format used in FIG.
As shown in (a), at the head of a sector (data frame) which is the minimum unit of recording, data I for identifying the sector is provided.
D · 1 is arranged, then the error detection code IED2 of the data ID is arranged, the data type 3 is arranged thereafter, the preset data 4 is arranged, the reserved area 5 is arranged thereafter, and the main area is arranged thereafter. Data 6
Are arranged, and then the error detection code EDC7 is arranged.

Here, the data type 3 indicates whether the information to be recorded on the rewritable information storage medium 21 is data for PC (personal computer) use or not.
Flag information (not shown) for identifying whether the data is AV (audio / video) data for which reproduction is required can be included.

The data structure shown in FIG. 1A corresponds to the above-mentioned reserved area in the rewritable information medium of the present generation, which is replaced with data type 3 and preset data 4. Here, the contents of the areas P2 to P3 of the data type 3 and the preset data 4 are variable contents (time-varying data) that change every time the medium is rewritten. That is, the preset data 4 is generated by, for example, a preset data generating unit 66 in FIG. 7 described later. The preset data generation unit 66 is a kind of “random number generator” and constantly generates time-varying random data. When rewriting information recorded on the rewritable information storage medium 21, the time-varying random data is used as the preset data 4. As a result, every time the information is rewritten, the contents of the preset data 4 are changed. Changes.

When rewriting is repeated as it is with the data structure of FIG. 1A (a data structure including a data ID with no pattern change at the head), the rewritten portion of the data ID on the medium always becomes the same, and The number of rewritable times decreases. Therefore, the data ID and IED shown in FIG.
The areas P1 and P2 (6 bytes) are replaced with the data types and preset data areas P2 and P3 (6 bytes), and the data arrangement is rearranged as shown in FIG. With this rearrangement, the data type 3 comes to the head of the sector.

Then, as shown in FIG. 1 (c), scramble processing is performed on the data from the data ID · 1 after the rearrangement to the EDC 7 to generate scrambled data 11. This scrambling process is performed, for example, in FIG.
Is performed by the scramble circuit 57 of FIG.

In this process, a sector (data frame)
The area of the preset data rearranged at the head of the data is not scrambled, and is used as non-scrambled data 11 *. This non-scrambled data 11 * is shown in FIG.
As shown in (1), it is arranged before the scramble data 11. The sector data (FIG. 1C) after the partial scrambling process thus obtained is subjected to a predetermined modulation (8/16 modulation or the like).

As shown in FIG. 1D, predetermined synchronization codes 19a, 19b, 19c,... Are added to the modulated data 13a, 13b, 13c,. In this way, a predetermined number (for example, 16 sectors or 32 sectors) of sector data in which the modulated data and the synchronization code are mixed and arranged is combined and ECC-encoded. The ECC encoded data is shown in FIG.
The information is written to the rewritable information storage medium 21 (e.g., a next-generation DVD-RAM disk using a blue laser or a DVD-RW disk) shown in FIG.

FIG. 2 is a diagram for explaining the descrambling process of the sector data reproduced from the rewritable information storage medium.

The sector data having the data structure shown in FIG. 1 is recorded on the rewritable information storage medium 21 shown in FIG. The contents immediately after reproducing the recorded data are shown in FIG.
As shown in (b), the synchronization codes 19a, 19b, 19
, and data 15a, 15b, 15c,... before demodulation are mixedly arranged. When the reproduced data shown in FIG. 2B is demodulated and the synchronization code is deleted, non-scrambled data 17 * after demodulation and scrambled data 17 after demodulation are obtained as shown in FIG. 2C.

As shown in FIG. 2D, the content of the non-scrambled data 17 * is a set of data type 3 and preset data 4 (6 bytes). On the other hand, the scrambled data 17 is descrambled (descrambled) by a descrambling circuit 58 shown in FIG. By this descrambling process, the scrambled data 17 is, as shown in FIG. 2D, a data ID · 1 immediately following the preset data 4 and an IED2.
The processing returns to the reservation area 5, the main data 6, and the EDC 7. After the non-scrambled data 17 *, the descrambled data ID, IED, reserved area, main data, and EDC are arranged in this order.

The descrambling process for the scrambled data 17 is performed at the head of the sector (synchronization code 19a).
At the position 6 bytes later (the size of the non-scrambled data 17 *).

Alternatively, a synchronization code 19c is arranged at the beginning of the scrambled data 17, and if the synchronization code 19c has its own unique pattern, the synchronization code 19c is detected after the detection of the sector head by the synchronization code 19a. By doing so, the scramble data 17
The start position of the descrambling with respect to.

The sector data after the end of the descrambling process (FIG. 2D) returns to the pre-recording sector data after the replacement process shown in FIG. 1B. The variable content areas P1 to P1 at the head of this sector data (FIG. 2D)
When P2 (data type and preset data of 6 bytes) is replaced with subsequent data areas P2 to P3 (data ID and IED of 6 bytes), FIG.
As shown in (e), the original sector data structure (FIG. 1)
Return to (a)).

Recording is performed by the method shown in FIG. 1 (intra-sector scrambling), and recording is performed by the method shown in FIG.
When playback is performed with scramble, data before recording (Fig. 1
The same data (FIG. 2E) as (a)) can be reproduced. According to this method, since the preset data 4 is set to a different value each time information is rewritten, the scrambling condition for the data ID is different each time. As a result, since different scrambled data IDs are recorded on the rewritable information storage medium 21, the deterioration of the recording film is reduced, and the number of rewritable times and the reliability of the reproduced signal can be improved.

Further, a part of the preset data 4 whose contents change each time rewriting (the lower n bits 27 in FIG. 1A;
n is, for example, any one of 1 to 8) for selection of a large number of prepared synchronization codes.
Can also be changed. That is, according to the embodiment described with reference to FIGS. 1 and 2,
For the rewritable information storage medium 21, the information (lower n bits 27 of the preset data 4) related to the selection of the synchronization code related to the scrambling of the data ID can be changed at each rewriting (random change at random). (Including information to be included). Then, the information storage medium 21
Since the scrambled data ID information and synchronization code recorded above change each time rewriting is performed, reproduction signal deterioration due to material flow of the recording film or metal fatigue hardly occurs, and the number of times of rewriting is improved.

FIG. 3 shows a read-only information storage medium (DVD-
FIG. 3 is a diagram for explaining a scramble process of sector data written to a ROM disk, a once-written DVD-R disk, and the like (22). This process is used in a master disc recording process when used when creating a ROM disc, and is used in a recording process using an R recorder when used when burning an R disc.

In order to enhance compatibility or commonality with the rewritable information storage medium 21 of FIG. 1, the data structure of the read-only information storage medium 22 before sector scrambling (FIGS. 3A and 3B). Is similar to the data structure of the rewritable information storage medium 21 before the sector scramble (FIGS. 1A and 1B).

That is, in the sector recording format used in the next-generation read-only information storage medium 22, FIG.
As shown in (a), at the head of a sector which is the minimum unit of recording, a data ID · 1 for identifying the sector is arranged,
After that, the error detection code IED2 of the data ID is arranged, followed by the specific information 8 (copyright management information 8a and 8b), then the main data 6, and then the error detection code EDC7. .

Here, the specific information (copyright management information) 8 includes copy control information, copyright, and / or information on a distribution area (such as Japan or North America) of the information content recorded as the main data 6. Be recorded. The specific information (copyright management information) 8 is information whose content is fixed.

In the data structure of FIG. 3A, areas P2 to P3 of data type 3 and preset data 4 in FIG. 1A are replaced with copyright management information 8a of the same size (6 bytes). It corresponds to the thing. Here, assuming a case where the data size of the copyright management information 8a + 8b exceeds 6 bytes, the copyright management information 8 is divided into two parts, and the areas P2 to P3 of a part (8a) of FIG.
This corresponds to the areas P2 to P3 of the data type 3 and the preset data 4 in (a). The areas P3 to P4 of the other part (8b) of the copyright management information 8 are shown in FIG.
This corresponds to the areas P3 to P4 of the reservation area 5 in (a).

If the required size of the copyright management information 8 is within 6 bytes, the copyright management information 8 = 8a, and the copyright management information 8b does not exist.

The areas P1 and P2 (6 bytes) of the data ID and the IED in FIG. 3A are interchanged with the areas P2 and P3 (6 bytes) of the copyright management information 8a.
The data arrangement is rearranged as shown in FIG. By this rearrangement, a part (8a) of the copyright management information 8 comes to the head of the sector.

Then, as shown in FIG. 3 (c), scramble processing is performed on the data of the entire sector from the copyright management information 8a after the rearrangement to the EDC 7, and scramble data 12 is created. This scrambling process can be performed by, for example, a scramble circuit 57 of FIG. 7 described later.

In this processing, the area of the copyright management information 8a rearranged at the head of the sector is also scrambled. The scrambled sector data (FIG. 3 (c)) thus obtained is subjected to a predetermined modulation (such as 8/16 modulation).
Receive.

As shown in FIG. 3D, predetermined synchronization codes 19e, 19f, 19g,... Are added to the modulated data 14a, 14b, 14c,. In this way, a predetermined number (for example, 16 sectors or 32 sectors) of sector data in which the modulated data and the synchronization code are mixed and arranged is combined and ECC-encoded. ECC-encoded data is shown in FIG.
The information is written on the read-only information storage medium 22 (e) of the next-generation DVD-ROM disc using a blue laser or the next-generation DVD-R disc once written.

Here, the synchronization codes 19e, 19f, 19
The code pattern of g,... may be a predetermined pattern, but is utilized by using a part of the copyright management information 8a (the lower n bits 28 in FIG. 3A; n is, for example, 1 to 8). From the synchronization code patterns prepared for many types, FIG.
The synchronization code pattern used in (d) may be selected.

In each of the embodiments shown in FIGS. 1 and 3, scramble is not applied to the synchronization code portion. Therefore, the head position of the sector data scrambled and recorded by the method of FIG. 3 (or FIG. 1) can be easily determined by searching for the unscrambled (having a unique pattern) synchronization code 19e (or 19a). Can be detected.

The data structure and data arrangement in the sector in FIG. 3A are the same as the data structure and data arrangement in the sector of the current generation DVD-ROM video (copyright management before division into two). Information 8a + 8b is copyright management information CPR_M of the current generation DVD-ROM video.
AI). Therefore, the sector data format of the next-generation DVD playback disk shown in FIG. 3A has a high commonality with the sector data format of the current-generation DVD playback disk (not shown), and hardware / software developed in the current generation is used. Wear has become easier to use in the next generation.

More importantly, the areas P1 and P2 of the data ID and IED and the areas P2 and P3 of the copyright management information 8a in FIG. 1A corresponds to the data ID and IED areas P1 and P2 and the data type and preset data areas P2 and P3 in a one-to-one correspondence.

Therefore, the process of converting the sector data of FIG. 1A into the data array of FIG. 1B (or the reverse process) and the process of converting the sector data of FIG. And the conversion to the data array (or vice versa) can be common contents. Therefore, compatibility between the rewritable medium 21 and the read-only medium 22 can be improved.

FIG. 4 is a diagram for explaining the descrambling process of the sector data reproduced from the reproduction-only information storage medium 22.

The sector data having the data structure shown in FIG. 3 is recorded on the read-only information storage medium 22 shown in FIG. The contents immediately after reproducing the recorded data are shown in FIG.
As shown in (b), the synchronization codes 19e, 19f, 19
.. and data 16a, 16b, 16c,... before demodulation are mixedly arranged. When the reproduced data shown in FIG. 4B is demodulated and the synchronization code is deleted, the demodulated scrambled data 18 is obtained as shown in FIG. 4C.

The scramble data 18 corresponds to FIG.
Is descrambled (descrambled) by the descramble circuit 58 of FIG. Scramble data 18
Is started from the head of the sector (the position of the synchronization code 19e). By this descrambling process, the scrambled data 18 is
As shown in (d), the data ID 1 immediately following the copyright management information 8a, the IED 2, and the copyright management information 8b
Then, the process returns to the main data 6 and the EDC 7.

The sector data after the end of the descrambling process (FIG. 4D) returns to the pre-recording sector data after the replacement process shown in FIG. 3B. The fixed content areas P1 to P1 at the head of this sector data (FIG. 4D)
P2 (6 bytes of copyright management information 8a) and subsequent data areas P2 to P3 (6 bytes of data ID and I
ED), the operation returns to the original sector data structure (FIG. 3A) as shown in FIG.

The data structure of the read-only information storage medium 22 after descrambling (FIGS. 4D and 4E) is the data structure of the rewritable information storage medium 21 after descrambling (FIG. 2D). (E)). Thereby, compatibility or commonality between the rewritable information storage medium 21 of FIG. 1 and the read-only information storage medium 22 of FIG. 4 is enhanced.

The data structure (sector scramble format) shown in FIG.
A major feature is that sector scrambling is performed on an information group including D, IED, and copyright management information.

The features of the embodiment described with reference to FIGS. 1 to 4 can be summarized as follows.

(1) For the rewritable information storage medium 21, the scramble process for the data ID · 1 is performed by using “information that changes every rewriting (preset data 4)”, and the read-only information storage medium The scramble process for the data ID · 1 is performed on the data ID 22 using the rearrangement of the “fixed information (copyright management information 8a)” recorded.

(2) In the case of the read-only information storage medium 22, scrambling is started from the fixed information (copyright management information 8a) at the head of the sector, so that the scrambling condition for the data ID-1 is always constant.

(3) For the read-only information storage medium 22, information used in the rewritable information storage medium 21 (data type 3 and data type 2) is used as information related to data ID scrambling and synchronization code selection. Preset data 4)
Information (copyright management information 8a) placed in the same place as
Use Thereby, the commonality (compatibility) of the reproduction processing between the rewritable information storage medium 21 and the reproduction-only information storage medium 22 is enhanced.

(4) In the read-only information storage medium 22, the information at the head position is fixed information (copyright management information 8a) as shown in FIG. 3B, and the recording pattern of this information is always fixed. On the other hand, information is not rewritten in the read-only information storage medium 22, so that scrambling with this fixed information at the beginning (deterioration due to repeated rewriting) does not cause a problem.

(5) Once the data is arranged in each sector information, a part of the same data size in the same place of “reproduction only” and “recordable” (FIG. 1) by partial rearrangement
(A), P2 to P3 in FIG. 3A) are moved before the data ID, and then scrambled.
Rewritable information storage medium 21 and read-only information storage medium 22
And the commonality (compatibility) of the playback processing between them.

(6) Since the data structure of FIG. 3A is the same as that of the current generation DVD video, compatibility with the conventional DVD video can be easily obtained. As a result, when manufacturing an information recording / reproducing device or an information reproducing device based on the present invention,
The possibility of diverting the hardware and / or software used in the conventional DVD device is increased, and it is possible to develop an information recording / reproducing device or an information reproducing device of a next-generation DVD at low cost and with a short delivery time.

(7) Since the data of FIG. 3 is similar in structure to the data of FIG. 1 (only the difference between the scramble / non-scramble at the head of the sector), the device developed for the rewritable medium of FIG. Hardware and software can be easily shared between the device and the device developed for the reproduction medium shown in FIG.

FIG. 5 is a diagram for explaining a method of selecting a synchronization code for sector data recorded on a rewritable information storage medium or a read-only information storage medium.

Many patterns of the synchronization code used in FIG. 1 or FIG. 3 are prepared in a plurality of tables in the synchronization code selection table 20. These code patterns are “SY0 = 0001 0010 0100 0100 0000 0000 0001 0
001 ”or“ SY1 = 0000 0100 0000 0100 0000 0000 0
001 0001 "
A large number of synchronization code tables including a plurality of types of synchronization codes having different patterns are stored in the synchronization code selection table 20. Which of these multiple synchronization code tables is used as the target synchronization code (for example, FIG. 1)
Whether to select for 19a in (d) or 19e in FIG. 3 (d) can be performed as follows.

<In the case of the rewritable information storage medium 21> The digital sum value (D) of the modulated data 13z which comes to the end of the sector 31 immediately before the target corresponding sector 33 (D
The combination of the (SV) value 23 and the lower n bits 27 of the preset data 4 in the corresponding sector 33 (FIG. 1A) makes it possible to select one of a plurality of types of synchronization code tables stored in the synchronization code selection table 20. The synchronization code in the corresponding synchronization code table is selected as the optimum synchronization code 19a to be added to the head of the corresponding sector 33.

When the synchronization code 19a shown in FIG. 1D is selected, the modulated data 13a immediately follows. In the same manner, the optimum synchronization code group is stored in the synchronization code selection table 20.
Automatically added to the data group after the modulation. In this way, the sector data (FIG. 1D) in which the synchronization code and the data after modulation are mixedly arranged,
The data is written to the corresponding sector 33 of the rewritable information storage medium 21 in FIG.

<In the case of the read-only information storage medium 22> The digital sum value (D) of the modulated data 14z that comes at the end of the sector 32 immediately before the target corresponding sector 34
SV) value 24 and the copyright management information 8 in the corresponding sector 34
By combining with the lower n bits 28 of a (see FIG. 3A), the synchronization code in the corresponding synchronization code table among the plurality of types of synchronization code tables stored in the synchronization code selection table 20 becomes the corresponding sector. 34 is selected as the most suitable synchronization code 19e to be added to the head of.

When the synchronization code 19e shown in FIG. 3D is selected, the modulated data 14a immediately follows. In the same manner, the optimum synchronization code group is stored in the synchronization code selection table 20.
Automatically added to the data group after the modulation. In this manner, the sector data (FIG. 3D) in which the synchronization code and the data after modulation are mixedly arranged,
The data is written to the corresponding sector 34 of the read-only information storage medium 22 in FIG.

According to the same concept as that of the current generation DVD, the setting of the synchronization code 19 is limited to selecting one of two types of tables corresponding to the DSV value 23 (or 24). Therefore, when information is rewritten on the rewritable information storage medium 21, there are only two types of options, and there is a high possibility that the same synchronization code pattern is repeatedly selected. In this case, the repetitive use of the synchronous code having the same pattern easily causes reproduction signal deterioration due to material flow of the recording film and metal fatigue, and it has been difficult to increase the number of rewritable times.

On the other hand, in the embodiment shown in FIGS. 1 to 5, not only the DSV value 23 (or 24) but also the lower n bits 27 of the preset data 4 (or the lower n bits 28 of the copyright management information 8a). Can be used to select a synchronization code from a variety of patterns (eg, lower n
When the bit n is 2, the combination with the DSV value enables selection of eight types corresponding to three bits.) Therefore, the possibility that the same synchronization code pattern is repeatedly used for information rewriting is reduced. As a result, a different synchronization code is recorded for each rewrite, so that reproduction signal deterioration due to material flow of the recording film and metal fatigue hardly occurs, and the number of rewrites is improved.

Further, the n bits (27 or 28) used for selecting the synchronization code have the same position (FIG. 1 (a) or FIG. 3) in the rewritable information medium 21 and the read-only information medium 22.
(A) P3), and a method of selecting a desired (optimum) synchronization code by a combination of the n bits (27 or 28) and the DSV value (23 or 24). It is common to the read-only information medium 22. Therefore, compatibility or commonality between the rewritable information medium 21 and the read-only information medium 22 can be ensured with respect to the synchronization code selection method.

FIG. 6 shows the corresponding sector (33 or 34).
FIG. 7 is a diagram for explaining a synchronous code detection, an error check of a data ID using an IED recorded in a corresponding sector, and an access control using information of the data ID or detection of an off-track during continuous reproduction.

As shown in FIG. 6C, the sector 33 reproduced from the rewritable information medium 21 (FIG. 6A)
2 (b), and the sector 34 reproduced from the read-only information medium 22 (FIG. 6 (b)) contains information as shown in FIG. 4 (b). I have.

The start position of the corresponding sector 33 (or 34) is determined by the synchronization code 19a using the pattern matching method.
(Or 19e) can be detected (for example, “0001 0010 0100 0100 0000 0000 0001 000”
When searching for a 32-bit synchronization code having a bit pattern of "1", a bit string having the same arrangement may be searched as a search keyword).

The searched synchronization code 19a (or 19)
If the head position of the corresponding sector 33 (or 34) is known by e), the data 15a, 15b, 15c,... before demodulation immediately after the synchronization code 19a (or 19e).
(The physical size of one sector is a predetermined constant value (for example, 2048 bytes), so if only the head position is known, the information can be obtained in sector units). Can be taken out).

FIG. 6D shows the detected synchronization code 19.
a (or 19e) and the immediately preceding demodulated data 15
a (as-scrambled data 17a or 18
a) is illustrated.

The pre-demodulation data 15a, 15b, 15c,...
Is demodulated by the corresponding sector 33 (or 34) and descrambled, to obtain sector data (equivalent to FIG. 2D) as shown in FIG. 6E or sector data as shown in FIG. 4 (d)). Since the positions of the data ID and IED in FIG. 6E and the data ID and IED in FIG. 6F are at the same position, the data ID and IED in FIGS. 6E and 6F are the same. It can be detected and extracted by the method (FIG. 6 (g)).

Data ID detected by detected IED
An error check is performed on the portion (FIG. 6 (h)). If there is no error, the access control of the information recorded on the medium 21 or 22 or the track at the time of the continuous reproduction thereof is performed using the information of the extracted data ID portion. Off detection can be performed (FIG. 6 (i)).

A specific method of the access control will be described later with reference to FIG. The specific method of detecting the off-track will be described later with reference to FIG.

FIG. 7 is a block diagram illustrating the configuration of an information recording system for a rewritable information storage medium or a read-only information storage medium.

The recording main data (source data)
Via the interface unit 42, the predetermined information adding unit 68
Sent to In the predetermined information adding section 68, the source data is subdivided in sector units, and the subdivided source data is stored in the main data 6 in FIG. 1 (a) or FIG. 3 (a).
Stored in the part.

The medium used for recording is a rewritable information medium 21.
In this case, in the predetermined information adding unit 68, the data ID · 1,
IED2, data type 3, preset data 4 and reservation area 5 are added, and E is added after the main data 6 portion.
DC7 is added. Data ID added at this time
1 is obtained from the data ID generator 65, and the preset data 4 is obtained from the preset data generator 66. The preset data generation unit 66 has a “random number generation function”, and can always generate time-varying random data as the preset data 4. The preset data generating unit 66 can also separately generate the lower n bits 27 shown in FIG. 1A, and the generated lower n bits 27 are used as part of the synchronization code selection key. Sent to

On the other hand, when the medium used for recording is the read-only information medium 22, the predetermined information adding section 68 places the data ID of the sector before the main data 6 portion.
1, IED 2 and copyright management information 8 (8a and 8b) are added, and EDC 7 is added after the main data 6 part. The data ID / 1 added at this time is the data ID
The copyright management information 8 (8a and 8a) obtained from the
b) is obtained from the copyright management information data generator 67. Note that the copyright management information data generating unit 67
The lower n bits 28 shown in (a) can also be generated separately, and the generated lower n bits 28 are sent to the synchronization code selector 46 as a part of the synchronization code selection key.

In this embodiment, "n" of the lower n bits (27 or 28) is selected from a range of 1 to 8 bits.

The sector data having the data structure as shown in FIG. 1A generated by the predetermined information adding section 68 or the sector data having the data structure as shown in FIG. , To the data arrangement part exchange section 63. The data arrangement part exchange section 63 exchanges the contents of the head areas P1 and P2 (for example, 6 bytes) of the sent sector data with the contents of the subsequent areas P2 and P3 (for example, 6 bytes). As a result, FIG.
The sector data having the data structure as shown in FIG.
3A, and the sector data having the data structure as shown in FIG. 3A is converted into a data structure as shown in FIG. 3B.

The sector data in which the areas P1 and P2 and the areas P2 and P3 have been exchanged in the data arrangement partial exchange section 63 are sent to the scramble circuit 57. The transmitted sector data is data for a rewritable information medium (FIG. 1).
In the case of (b)), the scramble circuit 57 does not scramble the contents (data type 3 and preset data 4) of the head areas P1 and P2, and thereafter (from the data ID 1 after P2 to the EDC 7 at the end of the sector). Is subjected to scramble processing. On the other hand, the transmitted sector data is data for a read-only information medium (FIG. 3B).
In the case of (2), the scramble circuit 57 performs the scramble process on the entire sector from the head of the sector to the end of the sector.

The scrambled sector data is sequentially sent to the ECC encoding circuit 61. The ECC encoding circuit 61 collectively performs the ECC encoding on the transmitted sector data in a predetermined number (for example, for 16 sectors or 32 sectors).

The data subjected to the ECC encoding is sent to the modulation circuit 51. The modulation circuit 51 performs a predetermined modulation (such as 8/16 modulation) on the transmitted data while obtaining necessary information from the conversion table for modulation 53.
The modulated data (13a, 13b, 13 in FIG. 1D)
c,... or 14a, 14b, 14 in FIG.
c,...) are sent to the data synthesizing unit 44.

Of the modulated data sent to the data synthesizing section 44, the modulated data at the end of each sector (1 in FIG. 5).
3z or 14z), the digital sum value (DSV) value is calculated by the DSV value calculator 48. Calculated DSV value (23 or 24 in FIG. 5)
Is sent to the synchronization code selector 46.

The synchronization code selecting section 46 stores the DSV value calculated by the DSV value calculating section 48 and the lower n-bit data 27 from the preset data generating section or the lower n-bit data 27 from the copyright management information data generating section 67. 28, a specific (optimum) synchronization code is selected from various types of synchronization code tables recorded in the synchronization code selection table recording unit 47. This synchronization code selector 46
The + synchronization code selection table recording unit 47 corresponds to the synchronization code selection table 20 in FIG.

In this embodiment, four or more (for example, eight) synchronization code tables are prepared for the synchronization code (19a or 19e) at the same location (for example, the head position) in the sector. In this way, a plurality of types (for example, eight types) of bit patterns of the synchronization code (19a or 19e) coming at the head position of each sector (33 or 34) can be used.

The synchronization code (19a, 19b, 19 in FIG. 1D) in the synchronization code table selected from the synchronization code selection table recording unit 47 by the synchronization code selection unit 46.
c,... or 19e, 19f, 19 in FIG.
g,...) are modulated by the modulation circuit 51 in the data synthesis section 44.
Modulation data (13a, 13b, 13 in FIG. 1 (d))
c,... or 14a, 14b, 14 in FIG.
c,...).

When the data thus synthesized is for a rewritable information medium, the data (FIG. 1 (d)) is transferred by the recording system 41R of the information recording / reproducing section 41 to the rewritable information medium 21 (phase data). RAM disk adopting change recording method,
RW disk etc.).

On the other hand, if the combined data is for a read-only information medium, the data (FIG. 3 (d))
(A) an R disk which is cut to a master disk for duplicating a ROM disk by an original disk recording unit of a ROM disk, or (b) an R disk (write laser (E.g., a disk using a dye whose reflectance at the irradiated portion changes permanently).

The operation of each block element of the apparatus shown in FIG. 7 is controlled by the MPU therein using the RAM therein as a work area in accordance with the control program written in the ROM in the control section 43. It has become so.

FIG. 8 is a block diagram illustrating the configuration of an information reproducing system for a rewritable information storage medium or a read-only information storage medium.

In the data structure immediately after being reproduced from the information storage medium (21 or 22) by the information recording / reproducing section (or the reproducing section having no recording function) 41, as shown in FIG. 15z, 15a, 15b,... And synchronization codes 19y (19z), 19a (19e) to 19c.
(19c) are mixedly arranged. The data immediately after being reproduced by the reproduction unit 41 (reproduction system 41P) is sent to the synchronization code position detection / extraction unit 45 and the demodulation circuit 52.

The synchronization code position detecting / extracting section 45 uses the pattern matching method to extract the synchronization code (19a or 19a) at the head of each sector from the data immediately after reproduction.
e) Search and detect. After the head synchronization code is detected, the subsequent synchronization code (19b, 19b) in that sector is detected.
.. or 19f, 19g,...) are also detected and extracted. The extracted synchronization code (19a to 19c or 1
9e to 19g) are sent to the demodulation circuit 52. The demodulation circuit 52 knows the start position of the sector of the reproduction data from the reproduction unit 41 based on the information of the synchronization code (19a to 19c or 19e to 19g) from the synchronization code position detection / extraction unit 45, and synchronizes within the sector. You can also find the code location.

In the demodulation circuit 52, the synchronization code (19a to 19c or 19e to 1c) included in the sector is obtained based on the synchronization code information from the synchronization code position detecting / extracting section 45.
9g) is deleted. Then, the demodulated data (15a, 15b,...) Remaining in the sector after the deletion
16 is modulated). The demodulation conversion table recording unit 5
4 based on the demodulation information. Demodulation circuit 5
The data demodulated in 2 is sent to the descrambling circuit 58.

The descrambling circuit 58 once descrambles (descrambles) data in a predetermined range (P2 to P3) after a fixed byte (for example, 6 bytes) from the head (P1) of the sector, ID & I
It is sent to the ED section extraction section 71. In the predetermined range (P2 to P3) that has been descrambled, FIG.
As shown in (d), information of data ID · 1 and IED2 is included.

The data ID section & IED section extraction section 71 notifies the MPU of the control section 43 of the information content of the data ID / 1 in the descrambled predetermined range (P2 to P3). Alternatively, after the error of the data ID · 1 is checked by the IED 2 within the predetermined range (P2 to P3) descrambled by the error check unit 72 of the data ID part (see FIG. 6 (i)), The information content of the confirmed data ID / 1 is notified to the MPU of the control unit 43.
According to the information content of the data ID-1 thus notified,
The MPU of the control unit 43 can perform access control described later in detail with reference to FIG. 14 or off-track detection described in detail with reference to FIG.

The data demodulated by the demodulation circuit 52 is an EC
It is also sent to the C decoding circuit 62. The ECC decoding circuit 62 has a predetermined number (16 or 3).
2) sectors into one ECC block for EC
After the C-encoded data is subjected to ECC decoding, the data is sent to the descramble circuit 59.

If the medium used for reproduction is the rewritable information storage medium 21, the sector data after demodulation by the demodulation circuit 52 and ECC decoding by the ECC decoding circuit 62 are the same as those shown in FIG. 2 (c) and 2 (d). On the other hand, when the medium used for reproduction is the reproduction-only information storage medium 22, the demodulation circuit 52
The sector data after demodulated by ECC and ECC decoded by the ECC decoding circuit 62 has a data structure as shown in FIG. 6 (f) or FIG. 4 (c) (d).

The identification of whether the medium to be used is the rewritable information medium 21 or the read-only information storage medium 22 is based on the medium identification information recorded in the specific part of the medium (inner part in the case of a disk-shaped medium). This can be performed using information (not shown).

When the medium used for reproduction is the rewritable information storage medium 21, the descrambling circuit 59 operates as shown in FIG.
(C) A descrambling (descrambling) process is performed on data from a position (P2) after a fixed byte (for example, 6 bytes) from the head position (P1) of the data structure shown in (d) to the sector end position. Do. On the other hand, when the medium used for reproduction is the reproduction-only information storage medium 22, the descrambling circuit 59 outputs the data from the start position (P1) to the end position of the sector in the data structure shown in FIGS. Is subjected to a descrambling (descrambling) process. Data after descramble processing (Fig. 2 (d)
4 (d) is sent to the data arrangement partial exchange section 64.

The data arrangement partial exchanging section 64 transmits a predetermined range (P1 to P6 of 6 bytes) from the head of the transmitted descrambled data (FIG. 2D or FIG. 4D).
P2) and the subsequent predetermined range (P2 to P3 of 6 bytes)
And a process of exchanging. By this processing, when the medium used for reproduction is the rewritable information storage medium 21, FIG.
In the case where sector data having a structure as shown in (e) is obtained and the medium used for reproduction is the read-only information storage medium 22, FIG.
The sector data having the structure as shown in FIG.

Each of the sector data thus obtained (FIG. 2)
(E) or the data (data ID + IED) within the predetermined range (P1 to P2 of 6 bytes) in FIG. 4 (e) is detected by the data ID part & IED part extraction part 71, and the data ID after error check is extracted. Is done. Further, the main data 6 after a certain length (P1 to P4) from the head position of each of the obtained sector data (FIG. 2E or FIG. 4E) is extracted by the main data extraction unit 73, and the interface unit 42 Is output to the outside through

The operation of each block element of the apparatus shown in FIG. 8 is controlled by the MPU therein using the RAM therein as a work area in accordance with the control program written in the ROM in the control section 43. It has become so.

FIG. 9 is a circuit diagram showing a specific example of the scramble circuit 57 of FIG. This circuit configuration method can also be used to scramble from the position P2 to the EDC in FIG. 1B (if the scramble operation start / end timing is appropriately controlled).
A description will be given of an example of scrambling from position P1 to EDC in FIG.

The scramble circuit shown in FIG.
Bit shift register circuit 81 and initial conditions (eg, “000 0000 000
0 0000 "), and two EXOR circuits 85 and 86.

The bits r14 and r10 of the shift register circuit 81 are applied to two input terminals of the EXOR circuit 85, and the two input terminals of the EXOR circuit 86 are output from the EXOR circuit 85 and illustrated in FIG. A bit string (before scrambling) of sector data corresponding to such a data structure is provided.

The all-zero initial condition (“000 0000 0000
0000 ") of the shift register circuit 81 immediately after being set (that is, reset in the initial condition).
4 are all “0”. In this case, the output of the EXOR circuit 85 is "0". The output of the EXOR circuit 85 which is one input of the EXOR circuit 86 is “0”,
When the first bit of the sector data which is the other input of the XOR circuit 86 is "0", the output of the EXOR circuit 86 is also "0". Then, bits r0 to r14 of the shift register circuit 81 are set to “000...
In this situation (the output of the EXOR circuit 85 = "0"), the EXOR circuit 86 functions as an input / output in-phase buffer circuit for the sector data input before scrambling. From the bit r14 of the shift register circuit 81, the scrambled data 12 (FIG.
(C)) is output.

FIG. 10 is a circuit diagram of the descrambling circuit 5 shown in FIG.
8 is a circuit diagram showing a specific example of FIG. This circuit configuration is shown in FIG.
Although it can be used when descrambling from the position P2 to the EDC in FIG. 4D, a case where the descrambling from the position P1 to the EDC in FIG. 4D is described as an example.

The descrambling circuit shown in FIG. 10 basically has the same circuit configuration as the scramble circuit shown in FIG. 9, and includes a 15-bit shift register circuit 82 and initial conditions (for example, “000
0000 0000 0000 ”) to set the initial condition setting circuit 84
And two EXOR circuits 87 and 88.

The bits r14 and r10 of the shift register circuit 82 are applied to two input terminals of the EXOR circuit 87, and the two input terminals of the EXOR circuit 88 receive the output of the EXOR circuit 87 and the scrambled sector data. A bit string (FIG. 4C) is provided.

The circuit operation of FIG. 10 is the same (mirror-like) as the circuit operation of FIG. For this reason, the bit arrangement of the data scrambled by the scramble circuit of FIG. 9 can be accurately returned to the original bit arrangement by the descrambling circuit of FIG. 10 under the same initial conditions.

FIG. 11 is a flowchart for explaining an example of a procedure for creating data to be written into the rewritable information storage medium 21. This procedure is performed, for example, by the control unit 43 shown in FIG.
Is processed by the MPU in the server.

First, the rewritable information storage medium 21 (FIG. 1)
Information (source data) of the main data 6 to be recorded in (e)) is received by the interface unit 42 (step ST01). The MPU in the control unit 43 determines whether the received information is information of a personal computer or AV information, and, based on the determination result, a data type 3 (FIG. 1).
Set the contents of (a)). The set information is sent to the preset data generator 66 (step ST0).
2).

Subsequently, the data ID generating section 65 generates data ID information (data ID · 1 in FIG. 1A) for each sector (step ST03). Then, the data ID generation unit 65 generates an ID corresponding to the generated data ID information.
An error detection code (information of IED2 in FIG. 1A) is generated (step ST04).

In the preset data generating section 66, random preset data 4 (FIG.
(A)) is generated, and the generated random (time-varying) preset data 4 is combined with the information of the data type 3 set in step ST02 (step ST05).
R).

Predetermined information adding section 68 determines in step ST03
ID1 and IED2 obtained in ST04 and ST04
Is combined with the data type 3 and the preset data 4 obtained in step ST05R to create data having an arrangement as shown in areas P1 to P3 in FIG. 1A (step ST06R).

[0125] The reserved area 5 is appropriately added to the data created in this way, after that the information of the main data 6 received in step ST01 (for one sector) is added, and an error detection code (EDC7) is added at the end thereof. It is added (step ST07).

The data arrangement for one sector shown in FIG. 1A thus obtained is rearranged in the data arrangement part exchange section 63 as follows. That is, the data ID
The range including P1 and IED2 (P1 to P2; size of this range is, for example, 6 bytes) and the range including data type 3 and preset data 4 (P2 to P3; size of this range is also, for example, 6 bytes) are exchanged Figure 1
The data arrangement is changed to one sector as shown in (b) (step ST08R).

Of the data for one sector shown in FIG. 1B thus obtained, the first 6 byte areas P1 to P2
Except for (preset data 4 therein is time-varying data that changes randomly), all data from the part (P2) of the data ID · 1 to the end (EDC7) is scrambled by the scramble circuit 57 (step ST09).
R). As a result, the sector data after partial scrambling as shown in FIG.
++ Scramble data 11) is obtained.

The sector data after the partial scramble obtained in this way is grouped by a predetermined number (for example, 16 sectors or 32 sectors) in the ECC encoding circuit 61, and ECC encoded.
A CC block is configured (step ST10R).

The data in the ECC block is
1, for example, 8/16 modulation (step S
T11). Further, the digital sum value (DSV value 23 in FIG. 5) of the modulated data is sequentially calculated by the DSV value calculation unit 48 (step ST12), and the synchronization code selection unit 4
Sent to 6.

In the synchronization code selection section 46, the transmitted DSV value 23 and the lower n bits 27 of the preset data 4
1 (a), the synchronization code selection table 20 in the synchronization code selection table recording unit 47 is obtained.
From FIG. 5, an optimal (or predetermined) synchronization code is selected (step ST13R).

DSV sequentially calculated in step ST12
A series of synchronization codes (19 in FIG. 1D) selected by the value 23 and the lower n bits 27 of the preset data 4
a, 19b, 19c,...) are a series of data groups (13a, 13a in FIG.
b, 13c,...) (Step ST1)
4R).

Thus, sector data (FIG. 1 (d)) having a data structure in which the synchronization code group and the data group after modulation are alternately arranged is created (step ST15R), and the created sector data is rewritten information. It is sequentially recorded at a predetermined physical sector position on the storage medium 21.

FIG. 12 is a flowchart for explaining an example of a procedure for creating data to be written into the read-only information storage medium 22. This procedure is performed, for example, by the control unit 43 shown in FIG.
Is processed by the MPU in the server.

First, the read-only information storage medium 22 (FIG. 3)
Information (source data) of the main data 6 to be recorded in (e)) is received by the interface unit 42 (step ST01). The MPU in the control unit 43 determines whether the received information is information of a personal computer or AV information, and, based on the determination result, a data type 3 (FIG. 1).
Set the contents of (a)). The set information is sent to the preset data generator 66 (step ST0).
2). It should be noted that the processing of FIG.
When the method is applied only to step ST02, the processing in step ST02 can be omitted.

Subsequently, the data ID generating section 65 generates data ID information (data ID · 1 in FIG. 3A) for each sector (step ST03). Then, the data ID generation unit 65 generates an ID corresponding to the generated data ID information.
An error detection code (information of IED2 in FIG. 3A) is generated (step ST04).

In the copyright management information data generation section 67,
Copyright management information (CRP_MAI) 8 is issued according to a predetermined copy protection rule (step S).
T05P). FIG. 1A or FIG.
If the file has a size that does not fit in the areas P2 to P3 (6 bytes in this case) in (a), the copyright management information 8
Part (8a) that fits in areas P2 and P3 (6 bytes)
And a portion (8b) protruding therefrom. The protruding portion (8b) corresponds to the reserved area 5 (P3
3A having the same size as that of the area P3 in FIG.
Stored in P4.

The predetermined information adding unit 68 determines in step ST03
ID1 and IED2 obtained in ST04 and ST04
Is combined with the copyright management information 8a obtained in step ST05P to create data having an arrangement as shown in areas P1 to P3 in FIG. 3A (step ST06P).

[0138] The copyright management information 8b is appropriately added to the data created in this manner, after which the information of the main data 6 received in step ST01 (for one sector) is added, and an error detection code (EDC7) is added to the end. ) Is added (step ST07). If the copyright management information 8a is of a size (for example, within 6 bytes) that can fit in all the areas P2 to P3, it is not necessary to further add the copyright management information 8b. In that case, the areas P3 to P4 Leave blank.

The data arrangement for one sector shown in FIG. 3A thus obtained is rearranged in the data arrangement part exchange section 63 as follows. That is, the data ID
A range including P1 and IED2 (P1 to P2; the size of this range is, for example, 6 bytes) and copyright management information 8a
(P2 to P3; the size of this range is also, for example, 6 bytes), and rearranged into a data arrangement for one sector as shown in FIG. 3B (step ST0).
8P).

All the data for one sector shown in FIG. 3 (b) thus obtained are scrambled by the scramble circuit 57 (step ST09P). Thus, the scrambled sector data 1 as shown in FIG.
2 is obtained.

The scrambled sector data 12 obtained in this way is processed in the ECC encoding circuit 61 by
A predetermined number (for example, 16 sectors or 32 sectors) is collected, ECC-encoded, and ECC-encoded.
A block is configured (step ST10P).

The data in the ECC block is
1, for example, 8/16 modulation (step S
T11). The digital sum value (DSV value 24 in FIG. 5) of the modulated data is sequentially calculated by the DSV value calculation unit 48 (step ST12), and the synchronization code selection unit 4
Sent to 6.

In the synchronization code selecting section 46, the transmitted DSV value 24 and the lower n bits 28 of the copyright management information 8a are stored.
3A, the synchronization code selection table 20 in the synchronization code selection table recording unit 47 is obtained.
From (FIG. 5), an optimal (or predetermined) synchronization code is selected (step ST13P).

DSV sequentially calculated in step ST12
A series of synchronization codes (19 in FIG. 3D) selected by the value 24 and the lower n bits 28 of the copyright management information 8a
e, 19f, 19g,...) represent a series of data groups (14a, 14a in FIG.
b, 14c,...) (step ST1)
4P).

Thus, sector data (FIG. 3D) having a data structure in which the synchronization code group and the modulated data group are alternately arranged is created (step ST15P), and the created sector data is stored in the reproduction-only information. It is sequentially recorded at a predetermined physical sector position on the medium 22.

FIG. 13 is a flowchart illustrating an example of a procedure for reproducing data from the rewritable information storage medium 21 or the read-only information storage medium 22. This step is
For example, the processing is performed by the MPU in the control unit 43 shown in FIG.

First, the rewritable information storage medium 21 (FIG. 2)
(A)) or the read-only information storage medium 22 (FIG. 4)
The instruction information of the range to be reproduced from (a)) is received by the interface unit 42 (step ST21). Based on the reproduction range instruction information, the rewritable information storage medium 2
1 or the reproduction-only information storage medium 22 starts reproducing data having a structure in which the synchronization code (19a to 19c or 19e to 19g) and the data before demodulation (15a to 15c or 16a to 16c) are mixed (step ST2).
2).

The synchronization code (19a) in the reproduced data
To 19c or 19e to 19g) are determined by the synchronization code position detection / extraction unit 45 (step ST23). In the demodulation circuit 52, only the data before demodulation (15a to 15c or 16a to 16c) is extracted and demodulated based on the position of the determined synchronization code (step ST24).

In the ECC decoding circuit 62, it is assumed that the demodulated data includes information for a predetermined number of sectors (for example, 16 sectors or 32 sectors).
An error correction process is performed for each C block (step ST25). The data of each sector obtained after the error correction has contents as shown in FIGS. 2C and 4D or FIGS. 4C and 4D. De-scramble circuit 5
When the descrambling process is started from the head of the sector by the step 9, sector data having a structure as shown in FIG. 4D is obtained after the descrambling process (step ST2).
6).

With respect to the sector data (FIG. 2 (d) or FIG. 4 (d)) obtained in this way after the descrambling process, the data of the first 6 bytes (P1 to P2) and the immediately following 6 bytes The data of the minute (P2 to P3) is partially exchanged. By this partial exchange, step ST26
The data array of the sector data obtained in (1) is further rearranged to return to the sector data having the structure as shown in FIG. 2 (e) or FIG. 4 (e). The sector data (FIG. 2 (e) or FIG. 4 (e)) thus obtained has the same contents as the sector data (FIG. 1 (a) or FIG. 3 (a)) before recording.

After the sector data having the structure shown in FIG. 2 (e) or FIG. 4 (e) is obtained, the main data extracting section 73 extracts only the 6 main data portions in each sector (that is, the main data extracting section 73). Data ID, IED, data type, preset data, reserved area, copyright management information,
EDC is deleted). Then, only the extracted main data 6 is sequentially transferred to the outside of the apparatus (for example, a monitor TV (not shown)) via the interface unit 42 (step ST28).

In the above embodiment, the data ID.
Is recorded in the information storage medium 21 or 22 in a scrambled form, so that the information storage medium 21 or 22
Immediately after data is reproduced from, it is difficult to detect the location of data ID · 1 and its information content.

In order to avoid this problem, in the embodiment of the present invention, the data ID • 1 that has been scrambled and recorded using the detection position of the synchronization code 19a or 19e is used.
, And immediately after descrambling the data ID · 1 and the IED2, the information of the data ID · 1 is decoded to realize a high-speed access and a high-speed detection of an off-track during the continuous reproduction.

FIG. 14 is a flowchart illustrating an example of a method of controlling access to the rewritable information storage medium 21 or the read-only information storage medium 22. This step is
For example, the processing is performed by the MPU in the control unit 43 shown in FIG.

First, prior to access control, instruction information (command) indicating a portion to be reproduced from the rewritable information storage medium 21 (FIG. 2A) or the read-only information storage medium 22 (FIG. 4A). Is received by the interface unit 42 (step ST31). Based on this instruction information, the MPU in the control unit 43 calculates the value of the data ID corresponding to the “accessible” sector on the rewritable information storage medium 21 or the read-only information storage medium 22 (Step S).
T32).

The MPU of the control unit 43 determines in step ST31
The reproduction unit 41 is controlled based on the reproduction range instruction information obtained in (1), and an approximate reproduction start position on the medium 21 or 22 (a track position where a sector corresponding to the data ID calculated in step ST32 will exist). Then, information reproduction is started (step ST33).

When the information reproduction is started, the synchronization code position detection / extraction section 45 detects the position of the synchronization code (19a or 19e in FIG. 6D) located at the head of the sector from the reproduction information (step). ST34). This detection can be performed using the “pattern matching method” described with reference to FIGS.

The demodulation circuit 52 demodulates the pre-demodulation data immediately after the detected synchronization code (19a or 19e) in real time.
The data is sequentially transferred to the descramble circuit 58 (step ST35).

The descramble circuit 58 stores (1) reproduction from the rewritable information storage medium 21 having the non-scrambled data 11 * at the head of the sector, and (2) reproduction-only information storage having the scrambled data 12 from the head of the sector. Medium 2
A different process (step ST36) is performed for reproduction from step 2. That is, (1) in the reproduction from the rewritable information storage medium 21, the descrambling process is sequentially performed from the “demodulated data 17 (FIG. 2C)” after the synchronization code 19a (FIG. 2B). Is performed, and the data ID · 1 and IE immediately after the non-scrambled data 17 * are added to the processing result.
The data after D2 is transferred to the data ID part & IED part extraction part 71. Also, (2) in the reproduction from the reproduction-only information storage medium 22, the demodulated data (the data 18 in the scrambled state in FIG. 4C) immediately after the sector start position P1 having the synchronization code 19e is sequentially decoded. Executes the scramble processing, and transfers the processing result to the data ID section & IED section extraction section 71.

Here, the data arrangement after descrambling is known in advance as shown in FIG. 6 (e) or FIG. 6 (f), and where the data ID · 1 and IED2 are located is determined. Know before you do. Therefore, FIG.
(E) As shown in (f), at the stage before descrambling all data, the data ID section & IED section extraction section 7
1, the data ID.1 immediately after descrambling and the IED2 can be extracted (FIG. 6 (g)) and transferred to the error check section 72 of the data ID section.

That is, data ID section & IED section extraction section 71 immediately extracts data ID · 1 and IED2 from the data synchronously transferred from descramble circuit 58 (step ST37). The extracted data ID · 1 and IED2 are transferred to the error check section 72 of the data ID section.

The error checking section 72 of the data ID section uses the information of the extracted IED2 to extract the extracted data IED2.
It is checked whether there is any error in the information of D · 1 (step ST38). If there is an error (step ST39)
Yes, an error correction process (a process similar to ST25 in FIG. 13) is performed, and information of the data ID · 1 whose error has been corrected is extracted (step ST40).

When there is no error (No in step ST39), the data ID or error correction (step ST4)
0) When the reproducing unit 41 is tracing a track (recording track on the disk-shaped medium 21 or 22) on which the sector indicated by the data ID exists (step ST)
41 Yes, information reproduction is started (step ST4)
2).

When the track is not accurately traced (No in step ST41), the MP
U calculates the amount of track deviation from the difference between the value of the data ID reproduced from the medium and the value of the data ID of the sector to be reproduced (calculated in step ST32) (step ST43). Then, a correct track is obtained from the calculated track shift amount, and the process returns to step ST33.

Thereafter, steps ST33 to ST43 are repeated until the target track is accurately traced. By this repetitive processing, dense access control to the target track is performed.

A feature of the processing in FIG. 14 is that the location of the synchronization code (19a or 19e) included in the scramble data recorded on the information medium (21 or 22) is extracted (S
T34) After descrambling at least to the location where the data ID exists (ST36), access control is performed using the information of the descrambled data ID (ST37 to ST42).

Another feature of the processing shown in FIG. 14 is that the position of the scrambled data ID · 1 is searched using the synchronization code 19a or 19e existing before the position, and thereafter, the position is searched in real time until the data ID · 1 or IED2. In de
By scrambling, the data ID information is read at high speed and access control is performed.

According to the embodiment shown in FIG. 1 or FIG. 3, since the data ID is recorded in the information storage medium in a scrambled form, it becomes difficult to detect the data ID information used for access control. On the other hand, by searching for the position of the scrambled data ID using the synchronization code 19a or 19e existing in front of the scrambled data ID and subsequently descrambling to the data ID or IED in real time, the data ID information can be read at high speed. Can be read. As a result, high-speed access control becomes possible.

FIG. 15 is a flow chart for explaining an example of a method for detecting a track deviation during continuous reproduction on the rewritable information storage medium 21 or the read-only information storage medium 22. This procedure is processed by, for example, the MPU in the control unit 43 shown in FIG.

First, prior to access control, instruction information (command) indicating a portion to be reproduced from the rewritable information storage medium 21 (FIG. 2A) or the reproduction-only information storage medium 22 (FIG. 4A). Is received by the interface unit 42 (step ST51). Based on this instruction information, the MPU in the control unit 43 performs the access control described in FIG. 14 to access a predetermined reproduction start position on the rewritable information storage medium 21 or the reproduction-only information storage medium 22, The reproduction is started (step ST52). Thereafter, continuous reproduction is performed according to the reproduction procedure described with reference to FIG. 13 (step ST53).

The MPU in the control unit 43 sequentially calculates the data ID value of the sector to be reproduced next to the currently reproduced sector, and stands by in anticipation of the sector to be reproduced next (step). ST54).

During information reproduction, the synchronization code position detection / extraction section 45 detects the position of the synchronization code (19a or 19e in FIG. 6D) located at the head of the sector from the reproduction information (step ST55). . This detection is performed as shown in FIG.
This can be performed using the “pattern matching method” described with reference to (d).

The demodulation circuit 52 demodulates the data before demodulation immediately after the detected synchronization code (19a or 19e) in real time.
The data is sequentially transferred to the descramble circuit 58 (step ST56).

The descrambling circuit 58 stores (1) reproduction from the rewritable information storage medium 21 having the non-scrambled data 11 * at the head of the sector, and (2) reproduction-only information storage having the scrambled data 12 from the head of the sector. Medium 2
A different process (step ST57) is performed for reproduction from step 2. This process may be the same as step ST36 in FIG.

Data ID section & IED section extraction section 71 immediately extracts data ID · 1 and IED2 from the data synchronously transferred from descramble circuit 58 (step ST58). The extracted data ID · 1 and IED2 are transferred to the error check section 72 of the data ID section.

The error check section 72 of the data ID section uses the information of the extracted IED2 to extract the extracted data IED2.
It is checked whether there is any error in the information of D · 1 (step ST59). If there is an error (step ST60)
Yes), an error correction process (similar process to ST25 in FIG. 13) is performed, and the information of the error-corrected data ID · 1 is extracted (step ST61).

When there is no error (No in step ST60), the data ID or error correction (step ST6)
1) When the reproducing unit 41 is tracing a track (recording track on the disk-shaped medium 21 or 22) in which the sector indicated by the data ID is present (step ST)
62 Yes), returning to step ST53 to continue the continuous reproduction.

At the time of continuous reproduction, the data ID of the sector to be sequentially reproduced can be detected at high speed by using the processing of step ST54. However, this detection information is the data ID predicted in advance in step ST54.
If the value is different from the value, it is considered that "track off" has occurred (No in step ST62), and the process is restarted from the access control (step ST52) in FIG.

The feature of the processing in FIG. 15 is that the synchronization code (19a in FIG. 1D or 1 in FIG. 3D) included in the scramble data recorded on the information medium (21 or 22) is used.
9e) (ST55), and after descrambling at least to the location where the data ID exists (ST55).
57) It is to detect the off-track by using the information of the descrambled data ID.

Another feature of the processing shown in FIG. 15 is that the position of the scrambled data ID · 1 is searched using the synchronization code 19a or 19e existing before it, and thereafter, the data ID · 1 or IED2 is searched in real time. By descrambling, data ID information is read at high speed to detect an off-track.

According to the embodiment shown in FIG. 1 or FIG. 3, since the data ID is recorded on the information storage medium in a scrambled form, it becomes difficult to detect the data ID information used for detecting the off-track. On the other hand, the position of the scrambled data ID is stored in the synchronization code 19 existing before it.
Search using a or 19e, then data ID
By descrambling in real time up to the IED or the IED, the data ID information can be read at high speed. As a result, high-speed off-track detection can be performed.

According to the access control method of FIG. 14 or the off-track detection method of FIG. 15, the detected data ID
When there is no error, the access control or the off-track detection at the time of the continuous reproduction can be immediately executed using the information of the detected data ID.

Conversely, if an error is found in the detected data ID, the data in ECC units is transferred to the ECC decoding circuit 62, where the error is corrected, and information on the data ID is extracted. Like that. After that, the data ID information after error correction is transferred to the data ID section and the IED section extraction section 71 after passing through the descramble circuit 59 and the data arrangement partial exchange section 64.

<Effects of Embodiments> For the rewritable information storage medium 21, the information related to the scrambling of the data ID and the selection of the synchronization code may change at each rewriting (random). ) Data structure. For this reason, the data ID after the sector scramble recorded on the information storage medium 21 is used.
The information and the synchronization code change each time the information is rewritten, and it is difficult for the reproduction signal to deteriorate due to the material flow of the medium recording film or metal fatigue. For this reason, the number of rewritable times increases.

In the current generation DVD which is not based on the present invention,
The only way to set the synchronization code is to select one of the two types of tables in accordance with the DSV value. That is, when information is rewritten on the rewritable information storage medium 21, there is a high possibility that the same synchronization code is always selected because there are only two options. This increases the probability that the same synchronization code will be used repeatedly,
Reproduction signal deterioration due to material flow of the recording film or metal fatigue is likely to occur, and it has been difficult to increase the upper limit of the number of rewritable times.

In contrast, in the embodiment of the present invention,
Not only the DSV value but also the lower n bits 27 of the preset data 4 (or the lower n bits 27 of the part 8a of the copyright management information 8)
Using the bit 28), it is also possible to select a synchronization code from various types of patterns. For this reason,
The possibility that the same synchronization code is repeatedly used for rewriting information can be reduced. As a result, the probability of recording a different synchronization code for each rewriting increases, so that reproduction signal deterioration due to material flow of the recording film and metal fatigue hardly occurs, and the number of times of rewriting increases.

For the information storage medium 22 for reproduction, fixed information (copyright management information 8a) is placed in the same place as the variable information (data type 3 and preset data 4) used in the rewritable information storage medium. Therefore, compatibility between the rewritable information storage medium 21 and the read-only information storage medium 22 can be ensured in the reproduction processing, or the commonality can be increased.

Also, in order to secure a high access speed,
A data ID having identification information for each sector is arranged at a head position in each sector. Since this data ID does not change every time information is rewritten, if the data ID is arranged at the top and scrambled, the pattern of the scrambled data ID does not change every time information is rewritten. However, if the portion including the preset data 4 that changes every rewriting is rearranged at the head of the sector and scrambled, the data ID after the scramble is applied.
Pattern changes. As a result, reproduction signal degradation due to material flow of the recording film of the rewritable medium and metal fatigue hardly occurs, and the number of rewritable times increases.

In the reproduction-only information storage medium 22, the information brought to the head position is at least a part (8a) of the copyright management information. This information (8a) is fixed information and does not change. However, since the information is not repeatedly rewritten in the read-only information storage medium 22, even if the fixed information is scrambled with the fixed information at the top, the "recording film recording The problem of "reproduction signal degradation due to material flow and metal fatigue" does not occur.

As described above, once the data is arranged for each sector, the same data size portion at the same location of “reproduction only” and “recordable” is moved before the data ID by partial rearrangement. By applying sector scrambling after this, compatibility of the reproduction process between the rewritable information storage medium 21 and the read-only information storage medium 22 can be ensured or the commonality can be improved.

Further, the sector data structure suitable for the next generation DVD adopted in the embodiment of the present invention is the same as that of the current generation DV.
D is almost the same as the data structure of the current generation DVD.
And the commonality between them can be maintained. As a result, the main configuration (hardware and / or software) of a device using the embodiment of the present invention (for example, a high definition DVD video player / recorder) and a conventional device (for example, an NTSC level DVD video player / recorder) ) Is possible, and product development can be performed at low cost and with a short delivery time.

In the embodiment of the present invention, since the data ID is recorded on the information storage medium in a scrambled form, it is difficult to detect the data ID information used for access control. As a countermeasure, the position of the scrambled data ID is searched using the synchronization code existing immediately before, and the data from the searched synchronization code to the data ID (or up to the ID error detection code IED2) is decoded in real time.・ Scramble. As a result, the data ID information can be read quickly, so that high-speed access control can be performed.

Further, in the embodiment of the present invention, since the data ID is recorded on the information storage medium in a scrambled form, it is difficult to detect the data ID information used for detecting the off-track during the continuous reproduction. As a countermeasure, the position of the scrambled data ID is searched using the synchronization code existing immediately before, and the data code after the searched synchronization code up to the data ID (or up to IED2) is descrambled in real time. As a result, the data ID information can be read quickly, and as a result, high-speed off-track detection can be performed.

[0194]

As described above, according to the present invention,
A data structure that employs a data structure that applies sector scrambling including a data ID is used. By applying sector scrambling of the information medium for reproduction with a data structure similar to that of a rewritable medium, an information medium with improved data structure commonality between the two can be obtained. Can be provided.

[Brief description of the drawings]

FIG. 1 is an exemplary view for explaining a scramble process of sector data written on a rewritable information storage medium.

FIG. 2 is a view for explaining a descrambling process of sector data reproduced from a rewritable information storage medium.

FIG. 3 is a view for explaining a scramble process of sector data written on a read-only information storage medium.

FIG. 4 is a view for explaining a descrambling process of sector data reproduced from a reproduction-only information storage medium.

FIG. 5 is an exemplary view for explaining a method of selecting a synchronization code of sector data recorded on a rewritable information storage medium or a read-only information storage medium.

FIG. 6 shows the detection of the synchronization code of the sector, the error check of the data ID using the IED recorded in the sector,
FIG. 7 is a diagram for explaining access control using information of data ID and data ID, and detection of track deviation during continuous reproduction.

FIG. 7 is a block diagram illustrating a configuration of an information recording system for a rewritable information storage medium or a read-only information storage medium.

FIG. 8 is a block diagram illustrating a configuration of an information reproducing system for a rewritable information storage medium or a read-only information storage medium.

FIG. 9 is a circuit diagram showing a specific example of the scramble circuit 57 of FIG. 7;

FIG. 10 is a circuit diagram showing a specific example of the descrambling circuit 58 of FIG. 8;

FIG. 11 is a flowchart illustrating an example of a procedure for creating data to be written to a rewritable information storage medium.

FIG. 12 is a flowchart illustrating an example of a procedure for creating data to be written to a read-only information storage medium.

FIG. 13 is a flowchart illustrating an example of a procedure for reproducing data from a rewritable information storage medium or a read-only information storage medium.

FIG. 14 is a flowchart illustrating an example of an access control method for a rewritable information storage medium or a read-only information storage medium.

FIG. 15 is a flowchart illustrating an example of a method of detecting a track deviation during continuous reproduction in a rewritable information storage medium or a read-only information storage medium.

[Explanation of symbols]

1 Data ID; 2 IED (ID error detection code); 3 Data type; 4 Preset data;
Reserved area; 6 main data; 7 EDC (error detection code); 8 copyright management information (CPR_MAI);
11 *: non-scrambled data before modulation (for rewritable medium); 17 *: non-scrambled data after modulation (for rewritable medium); 11: scrambled data before modulation (for rewritable medium); 17 ... Scrambled data after modulation (for rewritable medium); 12: Scrambled data before modulation (for reproduction-only medium); 18 ... Scrambled data before modulation (for reproduction-only medium); 13, 14 ... Data after modulation ;
19: synchronization code; 21: rewritable information storage medium (DV
D-RAM, DVD-RW, etc .; 22 ... Read-only (or once written, can only be played back) information storage medium (DVD-ROM, DVD-R, etc.); 20 ...
Synchronization code selection table; 23, 24: DSV (Digital Sum Value) value; 27: Lower n bits of preset data 4; 28: Lower n bits of copyright management information 8a; 31 to 34: Sector; 20, 44 , 46 to 48... Synchronization information adding means.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideaki Osawa 70, Yanagicho, Kochi-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Yanagicho Business Co., Ltd. (72) Inventor Tadashi 70, Yanagicho, Kochi-ku, Kawasaki-shi Kanagawa Office F-term (reference) 5C052 AA02 AB04 AB09 CC06 CC12 DD04 5D044 BC05 BC06 CC06 DE17 DE42 DE50 DE52 DE96 JJ03 5D090 AA01 BB03 BB04 CC12 DD03 FF09 FF25 GG16

Claims (18)

[Claims] 1. A rewritable information medium capable of recording an information group including identification information for identifying each information recording unit and an information group including variable contents whose contents can be changed at each rewriting, and In a reproduction information medium on which an information group including identification information for performing identification of each recording unit and predetermined content fixed information is recorded, a first position including the identification information and a second position including the variable content Under the premise that the data having the structure in which the positions are exchanged are recorded on the rewritable information medium, the third position including the identification information and the fourth position including the content fixed information are different from each other. When the exchanged data structure is recorded on the reproduction information medium, the first position and the second position of the rewritable information medium correspond to the third position and the fourth position of the reproduction information medium, respectively. Rank When reproducing information medium, characterized in that a positional relationship of one-to-one correspondence. 2. The medium according to claim 1, wherein the content fixed information includes at least a part of copyright management information on a content recorded on the reproduction medium. 3. A data structure in which the third position and the fourth position are exchanged is modulated with scrambled data which has been subjected to scramble processing in a unit of recording of the information, and synchronization information is added to the modulated data. 3. The medium according to claim 1, wherein information in which the modulated data and the synchronization information are mixed and arranged is recorded. 4. The medium according to claim 3, wherein a synchronization code having a content indicating a head position of a recording unit of the information is arranged at a head of the modulated data. 5. An ECC encoding is performed on a predetermined number of the recording units of the scrambled scrambled data, and the ECC encoded information is recorded. The medium according to any one of claims 1 to 4. 6. An information group including identification information and identification information for identifying each recording unit of information is recorded, wherein a position of a part of the information group including the identification information and the identification For a data structure in which the position of the other part of the information group including at least a part of the information is replaced, scrambled data subjected to scramble processing including the identification information is recorded. Information medium for reproduction. 7. The information processing apparatus according to claim 6, wherein the scramble data is modulated, synchronization information is mixedly arranged in the modulated data, and information in which the modulated data and the synchronization information are mixedly recorded is recorded. A medium according to claim 1. 8. The medium according to claim 7, wherein a synchronization code having a content indicating a head position of a recording unit of the information is arranged at a head of the modulated data. 9. An ECC encoding is performed on a predetermined number of the recording units of the scrambled scrambled data, and the ECC encoded information is recorded. The medium according to any one of claims 6 to 8. 10. A position of a part of an information group including identification information for performing identification for each information recording unit is replaced with a position of another part of the information group including at least a part of specific information. A data arrangement partial exchange unit; a scramble circuit for performing scramble processing on the data structure exchanged by the data arrangement partial exchange unit; and a recording medium for recording the scrambled data scrambled by the scramble circuit on an information medium. An information recording device, comprising: 11. An EC which encodes scrambled data scrambled by the scramble circuit for each of a predetermined number of information recording units.
The apparatus according to claim 10, further comprising a C encoding circuit, wherein the data encoded by the ECC encoding circuit is recorded on the information medium. 12. Data recorded on the information medium includes:
The apparatus according to claim 10, further comprising a synchronization information adding unit that adds a predetermined synchronization code. 13. The apparatus according to claim 12, wherein said synchronization information adding means is configured to add said predetermined synchronization code based on the content of a specific information bit included in said specific information. The described device. 14. A modulation circuit for digitally modulating data ECC-encoded by the ECC encoding circuit, wherein the synchronization information adding means includes a digital sum value of the data modulated by the modulation circuit and the specific information. 13. The apparatus according to claim 12, wherein the predetermined synchronization code is added based on the content of a specific information bit included. 15. A method for reproducing recorded information from a medium on which information including identification information, identification information, main data and a synchronization code for identifying each recording unit of information is recorded, wherein: A synchronization code position detection / extraction unit for detecting and extracting the synchronization code located at the head; a demodulation circuit for demodulating information content following the synchronization code detected by the synchronization code position detection / extraction unit; A data arrangement partial exchange unit for exchanging a data position including the identification information and a data position including at least a part of the specific information in the information content demodulated by
An information reproducing apparatus, comprising: a main data extracting unit that extracts the main data following the specific information from the information content after the data positions have been exchanged by the data arrangement partial exchange unit. 16. The information recorded on the medium is scrambled in a unit of recording of the information, and the information content demodulated by the demodulation circuit is de-scrambled.
The information content descrambled by the descrambling circuit further comprises a scrambling circuit,
The apparatus of claim 15, wherein the apparatus is configured to receive the data location swap. 17. A method for extracting a location of a synchronization code recorded together with scrambled data recorded on an information medium, descrambling at least a location where a data ID exists, and then extracting information of the descrambled data ID. An access control method characterized in that access control is performed by utilizing the access control. 18. A method for extracting a location of a synchronization code recorded mixedly with scrambled data recorded on an information medium, descrambling at least a location where a data ID exists, and extracting information of the descrambled data ID. An off-track detection method, wherein the off-track detection is performed by utilizing the method.