WO2014208135A1 - Information recording medium and reproducing device - Google Patents

Abstract

At least one symbol of at least three symbols that have been subjected to modification processing in an address field (132a) is subjected to the same modification processing as a symbol in an address field (122a). Further, symbols in the address field (132a) different from the at least one symbol are at least either subjected to modification processing if the symbols in the address field (122a) are not subjected to the modification processing, or are not subjected to modification processing if the symbols in the address field (122a) are subjected to the modification processing.

Description

Information recording medium and reproducing apparatus

The present invention relates to an information recording medium capable of recording information and a reproducing apparatus capable of reproducing the information recording medium.

In recent years, in order to store enormous information such as high-quality video, it is required to increase the capacity of information recording media, that is, to increase the recording density. For this reason, the information recording medium is upgraded.

Since the specifications of the information recording medium are determined for each version, whether or not a new version of the information recording medium can be played back on a playback device in which various specifications are determined corresponding to the current version (old version), Even if it can be played back, the frequency of occurrence of playback errors may increase. In order to prevent this occurrence, Patent Document 1 discloses a technology that makes it impossible to reproduce a new version of an information recording medium in a reproducing apparatus corresponding to the current version.

In the technique of Patent Document 1, a new version of an information recording medium includes a playback device in which error correction encoded address information is incompatible with the new version of the information recording medium (for example, only the old version of the information recording medium). In the reproduction apparatus manufactured so as to correspond to the above, the modification is performed so that the address information cannot be decoded. That is, the new version of the information recording medium is in a state in which error correction of the address information is impossible in a playback device that does not support the new version of the information recording medium, and various data recorded on the information recording medium Access (that is, reproduction of various data) is impossible. This eliminates the possibility of malfunction when a new version of the information recording medium is loaded into a playback device that does not support the new version of the information recording medium.

Japanese Patent Publication “JP 2010-262713 A” (published on November 18, 2010)

However, the technique of Patent Document 1 assumes two versions: an information recording medium of the current version (first version) and a new version (second version) of information recording medium to be developed next. Only. That is, the manufacture of a new version of an information recording medium that can eliminate the possibility of malfunction in a playback device that does not support the new version of the information recording medium, and a data recording method or playback method corresponding thereto are disclosed. Only.

That is, the technology of Patent Document 1 does not assume a third version information recording medium developed after the second version information recording medium. Therefore, in this technology, when the third version of the information recording medium is manufactured, the playback device (first playback device) manufactured so as to support only the first version of the information recording medium, or the second version There is a possibility that information recorded on the information recording medium of the third version may be read out in a reproducing apparatus (second reproducing apparatus) manufactured so as to support only the information recording medium. In this case, when a third version of the information recording medium is loaded in the first reproduction device and the second reproduction device, neither of the devices can disable the reproduction process for the information recording medium. Malfunction may occur in this device.

The present invention has been made in view of the above problems, and an object of the present invention is to realize an information recording medium and the like that can prevent malfunction of the apparatus due to a new version of the information recording medium. is there.

In order to solve the above problems, an information recording medium according to one embodiment of the present invention provides:
(9, 5, 5) Among the types of information recording media having an address field subjected to error correction coding processing in the RS code and having the first version, the second version, and the third version, the type is An information recording medium as a third information recording medium which is a third version,
When the information recording medium whose type is the first version is the first information recording medium and the information recording medium whose type is the second version is the second information recording medium,
A deformation process is performed on at least three symbols out of nine symbols constituting the third address field of the third information recording medium corresponding to the first address field of the first information recording medium,
Of the at least three symbols subjected to the deformation process on the third address field, at least one symbol constitutes the second address field of the second information recording medium corresponding to the one symbol. The same deformation process as that for the symbol to be performed is performed,
For at least three symbols different from the at least one symbol,
(1) If the deformation process is not performed on the symbols constituting the second address field corresponding to any of the three symbols, the deformation process is performed,
(2) When the deformation process is performed on the symbols corresponding to any of the three symbols and constituting the second address field, at least one of the deformation processes not being performed It is.

According to one aspect of the present invention, there is an effect that it is possible to prevent malfunction of the apparatus due to a new version (third version) of the information recording medium.

It is a figure for demonstrating an example of the address field recorded on the optical disk which concerns on one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the optical disk based on one Embodiment of this invention, (a) is a top view which shows schematic structure of an optical disk, (b) is a figure which shows the structural example of each recording layer of an optical disk. It is. It is a figure which shows the structural example of an address unit number, (a) is a figure which shows the structural example of the address unit number recorded on the optical disk of the 1st version, (b) is the 2nd version and this embodiment. It is a figure which shows the structural example of the address unit number of the optical disk recorded on (1). (A) is a figure which shows the example of a structure of an address field group, (b) is a figure which shows the example of a structure of address field "AF0" which is one of the address fields. It is a figure which shows the example of arrangement | positioning of the address field in a main data block. It is a figure for demonstrating the modification of the address field recorded on the optical disk which concerns on one Embodiment of this invention. It is a figure for demonstrating an example of the address field recorded on the optical disk which concerns on one Embodiment of this invention. It is a figure for demonstrating the modification of the address field recorded on the optical disk which concerns on another one Embodiment of this invention. It is a figure for demonstrating an example of the address field recorded on the optical disk which concerns on another one Embodiment of this invention. It is a functional block diagram which shows the structure of the recording / reproducing apparatus which concerns on another one Embodiment of this invention. It is a flowchart which shows an example of the flow of a recording operation | movement with respect to the optical disk which concerns on another one Embodiment of this invention. It is a flowchart which shows an example of the flow of the process of the reproduction | regeneration operation | movement with respect to the optical disk based on another one Embodiment of this invention. It is a functional block diagram which shows the structure of the mastering apparatus which concerns on another one Embodiment of this invention. It is a functional block diagram which shows the structure of the recording / reproducing apparatus which concerns on another one Embodiment of this invention. It is a flowchart which shows an example of the flow of a process of reproducing | regenerating operation | movement with respect to the optical disk by the recording / reproducing apparatus which concerns on another one Embodiment of this invention.

Hereinafter, each embodiment of the present invention will be described. In each embodiment, the optical disc 100 (information recording medium, third information recording medium, Ver3.0 disc) has a type corresponding to the type of the optical disc in which the first version, the second version, and the third version exist. Refers to the third version of the optical disc.

Among the first version, the second version, and the third version, the first version is the oldest version, and the second version indicates a version that is newer than the first version. The third version is a newer version than the second version, that is, the newest version. The first version to the third version may be three versions out of four or more versions.

Also, the type of the optical disk is determined by which standard parameters (optical disk material, thickness, modulation method, recording capacity, etc.) are used in the optical disk, that is, to which standard the optical disk corresponds. The standards are appropriately changed (upgraded) in order to increase the recording capacity, for example.

In the following description, the information recording media of the first to third versions are Ver1.0 disc (first information recording medium), Ver2.0 disc (second information recording medium), and optical disc 100 (the present invention). In each of the embodiments).

Note that the information recording media of the first to third versions may be various optical disks such as an optically readable disk, a magneto-optical disk, a phase change disk, or a magnetic disk.

[Embodiment 1]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

<Outline of Optical Disc 100>
First, a schematic configuration of the optical disc 100 will be described with reference to FIG. 2 is a diagram showing a schematic configuration of the optical disc 100, FIG. 2A is a plan view showing a schematic configuration of the optical disc 100, and FIG. 2B is a diagram showing each recording layer of the optical disc 100. As shown in FIG. It is a figure which shows the example of a structure.

In the following description, as a layer included in the optical disc 100, a rewritable recording layer is called an RE (RE-writable) layer, and a read-only recording layer is called a ROM (Read Only Memory) layer, which can be additionally recorded. The recording layer is called an R (Recordable) layer.

First, as shown in FIG. 2A, the optical disc 100 includes a management area 101, an inner area 102, a user data area 103, and an outer area 104 in this order from the inner circumference side. In FIG. 2, the management area 101 is provided only in the L0 layer as shown in FIG. 2B. However, the management area 101 is not limited to this and may be provided in any recording layer. , It may be provided in all recording layers.

The management area 101 is an area provided in the innermost circumference of the optical disc 100 and the recording layer farthest from the reproduction light incident side, and is an area that does not require tracking control or a barcode-like area that can be accessed only by focus control. This is a recording area (management area recording area). The recording / reproducing apparatus (for example, the recording / reproducing apparatus 1000 (see Embodiment 4) or the recording / reproducing apparatus 5000 (see Embodiment 5)) is designed to read information in the management area 101 when the optical disc 100 is inserted. Has been. The management area 101 is an area in which information can be written only at the time of manufacture (that is, an area that cannot be rewritten). In the present embodiment, the management area 101 indicates a BCA (Burst で は Cutting 本 Area).

In the management area 101, identification information indicating the structure of the optical disc 100 is mainly recorded. Specific examples of the identification information include the type of recording layer of the optical disc 100 (read-only type, write once type, rewritable type), the size of the optical disc 100, the version of the optical disc 100 (related to speed, etc.), the polarity of the servo, and the recording mark. Examples include polarity and a number unique to the optical disc 100. The recording order (or arrangement method) of each information in the management area 101 may be arbitrary. These recording orders are usually determined by standards and the like.

The inner area 102 is an area provided for each recording layer on the outer peripheral side of the management area 101 in the optical disc 100, and when the recording / reproducing apparatus performs processing on each layer, the reproducing light is first irradiated (firstly, A recording area from which information is read. Further, the inner area 102 is provided with an area where information can be written only from the inner circumference side of the optical disc 100 at the time of manufacture (that is, a non-rewritable area). In the case of a recordable type disc, the inner area 102 is further provided with an area where information can be rewritten after being inserted into the recording / reproducing apparatus (that is, a rewritable area).

In the inner area 102, for example, standard conditions for recording / reproduction to / from the optical disc 100, information indicating permission / non-permission (access restriction) of access to the recording / reproducing apparatus for each layer, and the like are recorded. In the case of a recordable type disc, the inner area 102 is further recorded with information indicating defects at the time of manufacture and positions of defects formed during use. Information indicating the position of the defect is recorded in a rewritable area of the inner area 102 and a defect management area in the outer area 104. The rewritable area of the inner area 102 may be provided with a test write area used for test writing when setting recording / reproducing conditions of recording marks such as laser power during recording / reproducing. .

In addition, in the non-rewritable area of the inner area 102, information used for copy protection (pre-recorded information) is recorded in advance. The pre-recorded information is read-only information that cannot be rewritten. The prerecorded information may be recorded in the management area 101.

In the optical disc 100, the non-rewritable areas of the management area 101 and the inner area 102 are also referred to as PB zones (reproduction-only areas). An area from the rewritable area to the outer area 104 in the inner area 102 is called an RW zone (recording / reproducing area). The RW zone is an area where a recording mark is recorded or reproduced.

Next, FIG. 2B shows the case where recording layers L0, L1,... Are referred to from the recording layer farthest from the reproducing light incident side, and when the recording layers L0 to L2 are all ROM layers (that is, three layers). The structure of the optical disk 100 of (structure) is shown. 2B shows a case where the recording layers L0, L1, and L2 are provided, but a configuration in which a recording layer is further provided on the reproducing light incident side may be used.

As shown in the figure, a management area 101, an inner area 102, a user data area 103, and an outer area 104 are provided in the recording layer L0 (ROM layer). The recording layer L1 (ROM layer) and the recording layer L2 (ROM layer) are provided with an inner area 102, a user data area 103, and an outer area 104. Since the management area 101 and the inner area 102 have been described above, description thereof is omitted here.

The user data area 103 is an area in which various information such as an application such as an OS (Operating System) and contents are recorded (or recordable). For example, in the user data area 103 of the ROM layer, applications and contents prepared by the disk supplier are recorded in advance. In the case of a recordable type disc, for example, a disc having an RE layer, the user data area 103 of the RE layer records content recorded by the user, application upgrade information, and the like by a recording / playback apparatus. Information is recorded.

The outer area 104 is usually provided on the outermost peripheral side of each layer of the optical disc 100, and information indicating the position of the defect described above is recorded. Further, the outer area 104 may be used as a buffer area for allowing overrun at the time of seek.

In the present embodiment, the optical disk 100 will be described as a three-layered disk including a ROM layer. However, the present invention is not limited to this, and the optical disc 100 may have a single-layer structure or a configuration having a plurality of recording layers other than three layers. Alternatively, a recording-only medium in which all recording layers are RE layers may be used. Further, an R layer may be provided instead of the RE layer, and at least two of a ROM layer, an RE layer, and an R layer may be provided as a recording layer.

The optical disc 100 is a third version optical disc. The first and second version optical discs (Ver1.0 disc and Ver2.0 disc), which are versions older than the third version, have a structure and modulation method. Etc. are different. For example, when the optical disc 100 has the structure shown in FIG. 2, the Ver1.0 disc may have a single-layer structure and the Ver2.0 disc may have a two-layer structure. Further, the Ver1.0 disc may have a two-layer structure, and the Ver2.0 disc may have a three-layer structure. In this case, for example, the modulation method of the Ver2.0 disc and the modulation method of the optical disc 100 may be different.

<An example of the address fields 112a, 122a, 132a>
Next, an example of the structure of the address unit number (AUN) and address field (AF) will be described with reference to FIGS.

First, a structural example of the address unit number (AUN) will be described with reference to FIG.
FIG. 3 is a diagram showing an example of the structure of the address unit numbers 111, 121, and 131, (a) is a diagram showing an example of the structure of the address unit number 111 recorded on the Ver1.0 disc, and (b) These are diagrams showing an example of the structure of the address unit numbers 121 and 131 of the Ver2.0 disc and the optical disc 100 (Ver3.0 disc). In the Ver1.0 disc, the Ver2.0 disc, and the optical disc 100, “AUN0” is the lowest symbol and “AUN3” is the highest symbol among the address unit numbers. Similarly, among the parities, “Parity 0” is the least significant symbol and “Parity 3” is the most significant symbol.

As shown in FIG. 3A, “AUN0” to “AUN3” are formed as the address unit number 111 of 4 symbols (1 symbol = 8 bits) for the Ver1.0 disc. These four symbols are indicated by bits A0 to A31. The roles of the bits A0 to A31 constituting the address unit number 111 are as follows.
• Bits A0 to A4 are 5 bits in the cluster. A cluster is a data recording unit. In the case of a recordable type disk, the cluster is a unit constituting one RUB (recording unit block).
The 19 bits of bits A5 to A23 are the cluster address.
The 3 bits of bits A24 to A26 are a layer number (recording layer number).
• Bits A27 to A31 are reserved.

On the other hand, as shown in FIG. 3B, the address unit number 121 of the Ver2.0 disc and the address unit number 131 of the optical disc 100 are each composed of 4 symbols and include “AUN0” to “A31” including bits A0 to A31. AUN3 "is formed. The roles of the bits A0 to A31 constituting the address unit numbers 121 and 131 are as follows.
• Bits A0 to A4 are 5 bits in the cluster.
The 20 bits of bits A5 to A24 are a cluster address.
The 3 bits of bits A25 to A27 are layer numbers.
• Bits A28 to A31 are reserved.

That is, in the Ver 2.0 disc and the optical disc 100, the number of bits of the cluster address is 20 bits corresponding to the increase in the total number of clusters due to the increase in capacity.

In the above description, the address unit number 121 of the Ver2.0 disc and the address unit number 131 of the optical disc 100 have been described as having the same structure, but they may have different structures. For example, when the recording capacity of the optical disc 100 is larger than the recording capacity of the Ver 2.0 disc, the number of bits assigned to the cluster address of the address unit number 131 is increased more than the number of bits assigned to the cluster address of the address unit number 121. May be. In this case, for example, the roles of the bits A0 to A31 constituting the address unit number 131 may be set as follows.
• Bits A0 to A4 are 5 bits in the cluster.
• The 21 bits of bits A5 to A25 are cluster addresses.
The 3 bits of bits A26 to A28 are a layer number.
• Bits A29 to A31 are reserved.

Such error correction encoding (ECC (error correction code) encoding) processing for each of the address unit numbers 111, 121, and 131 (address information) is performed for each address field shown in FIG. 4A is a diagram illustrating a structure example of the address field groups 112, 122, and 132, and FIG. 4B is an address field that is one of the address field groups 112, 122, and 132. It is a figure which shows the structural example of "AF0" (address field 112a, 122a, and 132a).

Note that the structures of the address field groups 112, 122, and 132 are the same, and the structures of the address field 112a (first address field), the address field 122a (second address field), and the address field 132a (third address field) are also the same. They are the same as each other. There are two main data ECCs, LDC (long distance indicator) and BIS (burst distance indicator subcode).

FIG. 4A shows an example in which the address fields 112a, 122a, and 132a are address fields “AF0” to “AF15”, respectively. In this case, the configuration of each of the address fields “AF0” to “AF15” is as follows.
The address field “AF0” is composed of address field bytes “AF0,0” to “AF8,0”.
The address field “AF1” is composed of address field bytes “AF0,1” to “AF8,1”.
Similarly, the address fields “AF2” to “AF15” are each composed of 9 bytes. The structure of the 16 address fields “AF0” to “AF15” is the same.

Also, one address field byte is 1 byte (1 symbol).

ECC encoding is performed in the address field unit of 9 bytes. Each of the address fields 112a, 122a, and 132a includes address unit numbers 111, 121, and 131, flag bits, and parity, respectively. That is, the address field refers to address information indicating the address of data recorded on the optical disc (recording data) or data read from the optical disc (reproduction data), and the address in the recording / reproducing apparatus corresponding to the optical disc. It is a data group formed so as to include at least specific data that makes it possible to perform error correction by performing predetermined encoding and decoding on information.

The address unit number is the above address information. That is, the address unit number is data indicating an address assigned to the recording data or the reproduction data. Parity is the specific data. That is, the parity is data that enables error correction of the address field. The flag bit is data indicating the recording state of the recording data. That is, information indicating a recording state of the recording data is recorded in the flag bit. The flag bit may be a spare area in a read-only type disc.

Further, the address unit is a data group composed of one of the address fields and the recording data or the reproduction data corresponding to the address information included in the address field.

FIG. 4B shows the address field “AF0”.

The address field bytes “AF0,0”, “AF1,0”, “AF2,0”, “AF3,0” of the address field “AF0” have address unit numbers “AUN3”, “AUN2”, “AUN1”, “AUN0” is assigned to each.

The flag bit is assigned to the address field byte “AF4, 0”.

Parity (Parity 3 to Parity 0) is assigned to the address field bytes “AF5, 0” to “AF8, 0”.

This error correction by ECC encoding in units of address fields has the ability to correct errors within 2 symbols by having 4 symbols in 9 symbols.

That is, the error correction encoded data formed as the address fields 112a, 122a, and 132a are RS (9, 5, 5), code length 9, data 5, and distance 5 RS (Reed Solomon) code. In other words, each of the Ver1.0 disc, the Ver2.0 disc, and the optical disc 100 includes address fields 112a, 122a, and 132a that have been subjected to error correction encoding processing on (9, 5, 5) RS code.

FIG. 5 shows an arrangement example of address fields in the main data block in which main data is recorded. Information recorded by the phase change mark, the dye change mark or the emboss pit row on the track formed in each recording layer is referred to as “main data (user data)”.

As shown in FIG. 5, one main data block is composed of 496 frames. The one frame has a 155-byte structure including data (38 bytes), BIS (1 byte), data (38 bytes), BIS (1 byte), and data (38 bytes). That is, one frame is composed of 152 bytes (= 38 bytes × 4) of data and 1 byte of BIS inserted every 38 bytes.

In this 496 frame main data block, the address units “Address Unit“ 0 ”” to “Address Unit 15” are arranged in units of 31 frames.

Further, in each 31 frames, three address field bytes are arranged in the first three frames, so that each of address fields “AF0” to “AF15” consisting of 9 bytes (9 symbols) is stored in the main data block. Is arranged. That is, as shown in FIG. 5, they are arranged as follows.
The address field bytes “AF0,0” to “AF8,0” (9 bytes in total) that constitute the address field “AF0” are composed of the first 31 frames of the first 31 frames of the main data block. It is arranged in 3 frames.
The address field bytes “AF0,1” to “AF8,1” constituting the address field “AF1” are arranged in the first three frames of the second 31 frames.
Similarly, address fields “AF2” to “AF15” are arranged in the 31st frame to the 16th frame, respectively.

<Example of Address Field 132a After Deformation Processing>
Next, an example of the address field 132a after the deformation process in the optical disc 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is a diagram for explaining an example of an address field 132a recorded on the optical disc 100 according to the present embodiment. In FIG. 1, each of the address fields 112a, 122a, and 132a includes four address unit numbers 111, 121, and 131, one symbol of flag bits, and four symbols of parity.

The deformation process for the address field 132a is performed during the error correction encoding process for the optical disc 100. This transformation process is a process for generating address information different from normal address information. The address information cannot be read unless the address information is restored in a recording / reproducing apparatus that can restore the normal address information. As an example of this modification process, there is a bit inversion process that inverts at least one of bits (original bits) constituting an address unit number indicating normal address information. In addition, as the modification process, a bit inversion process that inverts at least one of the flag bits or the bits (original bits) constituting the parity if the process can be restored to normal address information in the recording / reproducing apparatus. There may be.

Furthermore, the transformation process includes arranging a plurality of bits constituting one symbol at a position different from a predetermined position (bit position of the original bit). For example, the arrangement (arrangement) of “A24” to “A31” constituting the address unit number “AUN3” shown in FIG. 3 is changed (rearranged) to “A31”, “A24” to “A30”. Is mentioned.

Further, in each embodiment of the present application including this embodiment, the deformation process is not performed on the address field 112a of the Ver1.0 disk. In other words, the recording / reproducing apparatus (first recording / reproducing apparatus, Ver1.0 drive) manufactured so as to support only the Ver1.0 disc realizes the deformation process and the restoration process corresponding to the deformation process. Does not have the function of

On the other hand, deformation processing corresponding to the address field 122a of the Ver2.0 disc and the address field 132a of the optical disc 100 are performed. That is, the recording / reproducing apparatus (second recording / reproducing apparatus, Ver2.0 drive) manufactured so as to support only the Ver2.0 disc can perform data recording or data reproduction with respect to the Ver2.0 disc. The address field 122a has a function for realizing the deformation process and the restoration process corresponding to the deformation process. In addition, the recording / reproducing apparatuses 1000 and 5000 perform the above deformation process and a restoration process corresponding to the deformation process on the address field 132a so that at least data recording or data reproduction with respect to the optical disc 100 can be performed. It has a function to realize.

The above restoration processing refers to restoring the transformed bit to the original state and restoring it to the address field of the original state. For example, when bit inversion processing is performed as deformation processing, bit inversion processing is further performed on the inverted bits. Then, error correction decoding processing (error correction decoding) of the address information is performed for each address field configured by the restored address field bits.

Note that the deformation process and the restoration process will be described in detail in Embodiments 4 and 5.

Further, as described above, the error correction encoding process of the address information is performed in units of address fields. This is because speed is required for encoding (address decoding) of address information. Therefore, the error correction capability of the address information depends on the error correction capability of the address fields 112a, 122a, 132a. As described above, the address fields 112a, 122a, and 132a have the ability to correct errors within 2 symbols.

In other words, when error correction is performed in units of address fields, error correction of 3 symbols or more cannot be performed. Furthermore, when an error of 3 symbols or more is intentionally generated, the address information cannot be decoded.

In consideration of this point, in the optical disc 100, the address field 132a is configured so that the first recording / reproducing apparatus and the second recording / reproducing apparatus cannot be reproduced. That is, in the first recording / reproducing apparatus and the second recording / reproducing apparatus, in order to disable the data reproduction on the optical disc 100, the decoding process (address decoding) on the address field 132a of the optical disc 100 is disabled and the data reproduction is performed. For this reason, it is only necessary to prevent access to a predetermined position. Therefore, the deformation process for the optical disc 100 described above is performed on the address field 132a. That is, a part of the address field 132a is transformed (bit inversion).

For the Ver2.0 disc, the above-described modification process for the Ver2.0 disc is performed on the address field 122a so that the first recording / reproducing apparatus cannot perform data reproduction with respect to the optical disc 100. . That is, a part of the address field 122a is deformed (bit inversion).

As a result, for example, an optical disc 100 and a Ver 2.0 disc having address fields 132a and 122a as shown in FIG. 1 are formed. Here, an example of deformation processing performed mainly on the address field 132a of the optical disc 100 will be described.

When data recording on the optical disc 100 is performed, first, error correction encoding processing of address information common to the Ver 1.0 disc and the Ver 2.0 disc is also performed on the optical disc 100. Thereafter, a part of the address field 132a is transformed. In FIG. 1, among the nine symbols constituting the address field 132a, for the address field bytes (4 symbols) corresponding to the address unit number “AUN2”, the address unit number “AUN0”, the parity “Parity3”, and the parity “Parity1”. The deformation process is implemented. That is, the address unit number “AUN2”, the address unit number “AUN0”, the parity “Parity3”, and the parity “Parity1” are modified so as to satisfy the following (A) to (C). .

(A) At least 3 symbols out of 9 symbols constituting the address field 132a are subjected to transformation processing from the address field 112a of the corresponding Ver1.0 disc. In other words, deformation processing is performed on at least three symbols among the nine symbols constituting the address field 132a corresponding to the address field 112a.

As described above, the address field has an error correction capability of 2 symbols or less, and since the modification process (A) is performed, an error of 4 symbols occurs in the address field 112a. It has become. Therefore, the first recording / reproducing apparatus cannot correctly decode the address information (address unit numbers “AUN0” to “AUN3”). That is, when the first recording / reproducing apparatus performs the reproducing process or the recording process on the optical disc 100, the address information (address in data) cannot be properly read.

Therefore, since the deformation process (A) is performed, the first recording / reproducing apparatus cannot perform access (reproduction access) to a predetermined position of the optical disc 100, and the reproduction operation is started. Can be prevented. That is, the optical disc 100 can be set in a state in which it cannot be played back with respect to the first recording / playback apparatus.

(B) The address unit number “AUN0” among the address unit number “AUN2”, the address unit number “AUN0”, the parity “Parity3”, and the parity “Parity1” (at least three symbols) subjected to the transformation process in the address field 132a. And the parity “Parity3” (at least one symbol) are subjected to the same deformation process as the symbol in the address field 122a of the corresponding Ver2.0 disk (“the same deformation process as the deformation process of the second version”). . In other words, among at least three symbols subjected to the deformation process on the address field 132a, at least one symbol is the same as the deformation process for the symbols constituting the address field 122a corresponding to the one symbol. Processing is in progress.

By performing the modification process (B), the modification process for the at least one symbol (the address unit number “AUN0” and the parity “Parity3” in FIG. 1) and the restoration process for the modification process are performed. The function to be performed can be shared between the recording / reproducing apparatuses 1000 and 5000 and the second recording / reproducing apparatus. Therefore, when the recording / reproducing apparatuses 1000 and 5000 are manufactured, the above-described function of the second recording / reproducing apparatus can be used, so that the manufacturing process of the recording / reproducing apparatuses 1000 and 5000 can be simplified and the manufacturing cost can be reduced.

(C) Of the address field 132a, a symbol (address unit) different from the symbol (address unit number “AUN0” and parity “Parity3”) that has been subjected to the same transformation processing as the symbol of the address field 122a of the corresponding Ver2.0 disk. Numbers “AUN3” to “AUN1”, flag bits “Flag Bits”, parities “Parity2” to “Parity0”)
For the address unit number “AUN2” and parity “Parity1” that have not been modified in the Ver2.0 disc, the optical disc 100 has undergone transformation processing.
For the address unit number “AUN1” and the parity “Parity2” that have been modified in the Ver2.0 disc, the transformation processing is not performed in the optical disc 100 (“processing different from the second version”).

That is, in (C) above, at least three symbols out of the at least one symbol subjected to the transformation process on the address field 132a are different from each other.
(1) If the transformation process is not performed on the symbols constituting the address field 122a corresponding to any of the three symbols, whether the transformation process is performed,
(2) When a deformation process is performed on a symbol corresponding to any one of the three symbols and which constitutes the address field 122a, at least one of the responses to whether the deformation process is not performed Has been made.

Since the deformation process (C) is performed, a 4-symbol error has occurred in the address field 122a. Therefore, the second recording / reproducing apparatus cannot correctly decode the address information (address unit numbers “AUN0” to “AUN3”). Therefore, as the deformation process is performed, the optical disc 100 can be made unreproducible with respect to the second recording / reproducing apparatus as in the case of the deformation process (A).

As described above, in the optical disc 100, the above correspondences (A) to (C) are made to the address field 132a. That is, the optical disc 100 has the above-described configurations (A) to (C). Therefore, when the optical disk 100 is loaded in the first recording / reproducing apparatus and the second recording / reproducing apparatus, it is possible to prevent the reproducing process or the recording process from being performed on the optical disk 100 in these apparatuses. It is possible to prevent malfunction in the first recording / reproducing apparatus and the second recording / reproducing apparatus due to the above.

In particular, in FIG. 1, in the address field 132a, for one symbol in the address unit number 131 (address unit number “AUN0” of the optical disc 100), the address unit in the address field 122a corresponding to the one symbol. The same deformation process as the deformation process for the number 121 is performed. Further, in the address unit number 131, one symbol (address unit number “AUN2” of the optical disc 100) corresponding to one of the two symbols that have not been subjected to transformation processing on the address unit number 121 in the address field 122a. A deformation process is performed on. The parity of the address field 132a is also subjected to transformation processing as in the case of the address unit number 131. That is, the transformation process is performed on the parity “Parity 3” and “Parity 1” of the optical disc 100.

According to the above configuration, in the address field 132a, both the address unit number 131 and the parity are subjected to transformation processing for two symbols. That is, the deformation process that is biased to either the address unit number 131 or the parity of the optical disc 100 is not performed, and the deformation process without bias is performed. Therefore, in the first recording / reproducing apparatus and the second recording / reproducing apparatus, it is possible to derive an uncorrectable state (address correction error) in each of the address unit number 131 and the parity of the optical disc 100 without deviation. Therefore, the malfunction in the first recording / reproducing apparatus and the second recording / reproducing apparatus due to the optical disc 100 can be surely prevented.

Also, in FIG. 1, the deformation process is performed on at least three symbols among the nine symbols constituting the address field 122a corresponding to the address field 112a. More specifically, the two symbols constituting the address unit number 131 of the address field 122a corresponding to the address unit number 111 of the address field 112a are subjected to transformation processing and correspond to the parity of the address field 112a. The transformation process is performed on the two symbols constituting the parity of the address field 122a.

For this reason, the malfunction of the first recording / reproducing apparatus due to the Ver 2.0 disc can be prevented for the Ver 2.0 disc as well as (A).

Therefore, in the optical disc 100, assuming that the deformation process for the address field 122a is performed, the deformation processes (A) to (C) are performed, so that a conventional malfunction can be prevented (Ver2. It is possible to provide the optical disc 100 capable of preventing the malfunction in the first recording / reproducing apparatus and the second recording / reproducing apparatus without changing the malfunction in the first recording / reproducing apparatus due to the zero disc.

As described above, in order to prevent malfunctions in the first recording / reproducing device and the second recording / reproducing device due to the optical disc 100, the optical disc 100 has at least the configurations (A) to (C). It only has to be.

(Modification)
Next, a modification of the address field 132a recorded on the optical disc 100 will be described with reference to FIG. FIG. 6 is a diagram for explaining the modified example.

In the example of FIG. 1, in the optical disc 100, both the address unit number 131 and the parity are subjected to deformation processing (bit inversion processing) by two symbols. In other words, in the example of FIG. 1, in the optical disc 100, the deformation process is not performed with a bias on either the address unit number 131 or the parity, and the deformation process without a bias is performed. Thereby, it is possible to reliably prevent malfunction in the first recording / reproducing apparatus and the second recording / reproducing apparatus due to the optical disc 100. However, if this point is not taken into account, the present invention is not limited to this configuration, and deformation processing that is biased to either the address unit number 131 or the parity may be performed. The same applies to Ver2.0 discs.

For example, in FIG. 6, when transformation processing is performed for all nine symbols in the address field 122a of the Ver2.0 disc, the three symbols of the address unit numbers “AUN3” to “AUN1” in the address field 132a are Unlike the address field 122a, no deformation process is performed. On the other hand, other address unit numbers “AUN0”, flag bits “Flag bits”, and parities “Parity 3” to “Parity 0” are subjected to transformation processing in the same manner as the address field 122a.

Also in this case, since the above (A) to (C) are satisfied, malfunctions in the first recording / reproducing apparatus and the second recording / reproducing apparatus due to the optical disc 100 can be prevented.

In addition, for example, in the address field 122a of the Ver2.0 disc, the transformation processing is not performed for the three symbols of the address unit numbers “AUN3” to “AUN1”, and other address unit numbers “AUN0”, flags For the bits “Flag bits” and the parities “Parity 3” to “Parity 0”, the deformation process may be performed on all nine symbols in the address field 132a of the optical disc 100. .

That is, between the address unit number 121 and the address unit number 131, at least three of the corresponding nine symbols are reversed with respect to each other, such that one is subjected to transformation processing and the other is not performed. It suffices if processing (reversal processing) is performed. Further, the inversion process as described above may be performed on the parity “Parity 3” to “Parity 0” side, and the symbols constituting the flag bits “Flag bits” may be the target of the inversion process.

That is, as long as at least the above (A) to (C) are satisfied, the deformation process may be performed on any symbol in the address field 132a of the optical disc 100.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

<Example of Address Field 132a After Deformation Processing>
First, an example of the address field 132a after the deformation process in the optical disc 100 according to the present embodiment will be described with reference to FIG. FIG. 7 is a diagram for explaining an example of the address field 132a recorded on the optical disc 100 according to the present embodiment.

Also in FIG. 7, the deformation process for the address field 132a of the optical disc 100 is performed so as to satisfy at least the above (A) to (C). Further, the deformation process for the Ver2.0 disc is the same as that in FIG.

In FIG. 7, the address unit number “AUN1” and the address unit number “AUN0” are subjected to the deformation processing among the address unit numbers 121 of the Ver2.0 disc. On the other hand, in the optical disc 100, the modification processing is performed on the address unit number “AUN0” which is the lowest symbol among the address unit numbers 131.

In other words, among the address unit numbers 131 in the address field 132a, a symbol that has been subjected to the same transformation process as that for the address unit number 121 in the address field 122a corresponding to the address unit number 131 is the address unit number “ AUN0 ". The address unit number “AUN0” is a symbol corresponding to the lowest symbol of the address unit numbers 121 of the Ver2.0 disc on which the deformation process is being performed.

In general, in the first recording / reproducing apparatus, when it is determined whether the address has been correctly read based on whether the read address unit number has been incremented, the address can be correctly read from the lower symbols of the address unit number. I will judge.

Since the deformation process is performed on the address field 132a as described above, when the optical disc 100 is loaded in the first recording / reproducing device, the first recording / reproducing device reads the address unit number read from the optical disc 100. Since 131 cannot be incremented, error correction (address correction) of address information cannot be performed. Therefore, in the first recording / reproducing apparatus, the optical disc 100 is handled as an information recording medium that cannot be reproduced.

According to the configuration of the optical disc 100 according to the present embodiment, an address correction error can be more reliably derived in the first recording / reproducing apparatus, so that erroneous operation in the first recording / reproducing apparatus caused by the optical disc 100 can be reliably prevented. it can. Furthermore, malfunction in the first recording / reproducing apparatus due to the optical disc 100 can be prevented in the initial stage after the loading.

(Modification)
Next, a modified example of the address field 132a recorded on the optical disc 100 will be described with reference to FIG. FIG. 8 is a diagram for explaining the modified example.

In FIG. 8, since the least significant symbol of the address unit number 121 of the Ver 2.0 disc that is being subjected to the deformation process is the address unit number “AUN1”, the address unit number “AUN1” is also used in the optical disc 100. On the other hand, deformation processing is performed.

That is, it is not always necessary to perform the transformation process on the lowest symbol of the address unit number 131. In the address unit number 131, at least “of the address unit number 121 of the Ver2.0 disk on which the transformation process is being performed”. It is only necessary that the deformation process is performed on the “symbol corresponding to the least significant symbol”.

Also in this configuration, malfunction in the first recording / reproducing apparatus due to the optical disc 100 can be reliably prevented.

[Embodiment 3]
The following will describe still another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

Also in FIG. 9, the deformation process is performed on the address field 132a of the optical disc 100 so as to satisfy at least the above (A) to (C). Further, the deformation process for the Ver2.0 disc is the same as that in FIG.

In the present embodiment, in the address field 132a of the optical disc 100, the lower one of the two symbols of the address unit number 131 that is not subjected to the transformation process on the address unit number 121 of the corresponding Ver2.0 disc. Therefore, the deformation process is performed differently from the symbol of the address unit number 111 of the corresponding Ver1.0 disk.

In the example of FIG. 9, the two symbols that have not undergone transformation processing on the address unit number 121 of the Ver2.0 disc are the address unit numbers “AUN3” and “AUN2”. That is, the lower symbol of the two symbols is the address unit number “AUN2”. Therefore, in the figure, the modification process is performed on the address unit number “AUN2” of the address unit numbers 131 of the optical disc 100.

Generally, since the address unit number is incremented from the lower symbol, the value of the lower symbol changes before the upper symbol. In the optical disc 100, the deformation process is performed on the lower symbol (the address unit number “AUN2” in FIG. 9) that is not subjected to the deformation process in the Ver2.0 disk. Therefore, when the optical disc 100 according to the present embodiment is loaded in the second recording / reproducing device, the second recording / reproducing device detects more change in the value of the symbol than in the case of the Ver2.0 disc. Become.

That is, in the second recording / reproducing apparatus, the address unit number “AUN2” changes in value different from that when a Ver2.0 disc is loaded, and thus the address of the optical disc 100 cannot be corrected. Therefore, in the second recording / reproducing apparatus, the optical disc 100 is handled as an information recording medium that cannot be reproduced.

According to the configuration of the optical disc 100 according to the present embodiment, an address correction error can be more reliably derived in the second recording / reproducing apparatus, so that erroneous operation in the second recording / reproducing apparatus caused by the optical disc 100 can be reliably prevented. it can. Furthermore, malfunction in the second recording / reproducing apparatus due to the optical disc 100 can be prevented in the initial stage after the loading.

[Embodiment 4]
The following will describe still another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

<Configuration of recording / reproducing apparatus 1000>
FIG. 10 is a functional block diagram showing the configuration of the recording / reproducing apparatus 1000 (reproducing apparatus) of the present embodiment. The recording / reproducing apparatus 1000 is a recording / reproducing apparatus for the optical disc 100 as a Ver3.0 disc, and is connected to the AV system 20 provided outside.

The recording / reproducing apparatus 1000 includes a spindle motor 2, a thread mechanism 3, a matrix circuit 4, a reader / writer circuit 5, a modulation / demodulation circuit 6, an ECC encoder / decoder 7 (error correction decoding unit), a wobble circuit 8, an address decoder 9, and a system controller. 10, a servo circuit 11, a spindle servo circuit 12, and a laser driver 13.

The recording / reproducing apparatus 1000 executes processes S1 to S6 shown in the flowchart of FIG. 11 to be described later at the time of recording (data recording) on the optical disc 100. Further, the recording / reproducing apparatus 1000 executes processes S11 to S15 shown in the flowchart of FIG. 12 to be described later during reproduction (data reproduction) with respect to the optical disc 100.

The optical disc 100 is loaded on a turntable (not shown). The spindle motor 2 rotationally drives the optical disc 100 at a constant linear velocity (Constant Linear Velocity, CLV) during recording or reproduction with respect to the optical disc 100.

When the optical disc 100 is a read-only disc, the optical pickup 1 reads out information such as user data and addresses in the data from a track formed by an emboss pit row on the optical disc 100.

On the other hand, when the optical disc 100 is a recordable type disc, the optical pickup 1 reads out ADIP (Address In Pre-groove) information embedded as wobbling of the groove track on the optical disc 100.

At the time of recording on the optical disc 100, the optical pickup 1 records the main data on the track as a phase change mark or a dye change mark.

Further, at the time of reproduction with respect to the optical disc 100, the optical pickup 1 reads marks (user data, addresses in the data, etc.) recorded by the optical pickup 1 at the time of recording from the track.

The optical pickup 1 includes (i) a laser diode as a laser light source, (ii) a photodetector for detecting reflected light formed by a plurality of light receiving elements, and (iii) an output end of the laser light. An objective lens or the like is provided. In the optical pickup 1, laser light is irradiated onto the recording surface of the optical disc 100 through the objective lens, and the reflected light generated by the reflection of the laser light on the recording surface is guided to the photodetector. A system (not shown) is formed.

The laser diode outputs a blue laser having a wavelength near 405 nm. Further, the numerical aperture (Numerical Aperture, NA) by the above-described optical system is about 0.85. Note that the wavelength and numerical aperture are not limited to this, and may be any wavelength and numerical aperture defined by the type or type (version) of the optical disc 100.

In the optical pickup 1, the objective lens is held movably in both the tracking direction and the focus direction by a biaxial mechanism. The entire optical pickup 1 is configured to be movable in the disk radial direction by the thread mechanism 3.

The laser driver 13 gives a drive signal (drive current) to the laser diode provided in the optical pickup 1 to control the light emitting operation of the laser diode.

Reflected light information indicating the amount of reflected light from the optical disc 100 is detected by a photodetector provided inside the optical pickup 1. The reflected light information is supplied to the matrix circuit 4 after being converted into an electrical signal (ie, output current) corresponding to the amount of received light by the photodetector.

The matrix circuit 4 includes a current-voltage conversion circuit that converts an output current from the photodetector into a voltage, a matrix calculation / amplification circuit, and the like. The matrix circuit 4 generates necessary signals by matrix calculation processing.

The matrix circuit 4 generates, for example, a high frequency signal (reproduction data signal) corresponding to reproduction data, a focus error signal for servo control, a tracking error signal, and the like. The matrix circuit 4 further generates a push-pull signal as a signal related to the wobbling of the groove, that is, a signal for detecting wobbling.

The matrix circuit 4 gives (i) a reproduction data signal to the reader / writer circuit 5, (ii) a focus error signal and a tracking error signal to the servo circuit 11, and (iii) a push-pull signal to the wobble circuit 8, respectively.

The reader / writer circuit 5 reproduces the data read by the optical pickup 1 by performing processing such as binarization processing and reproduction clock generation processing by PLL on the reproduction data signal. The reader / writer circuit 5 gives the reproduced data to the modulation / demodulation circuit 6.

The modulation / demodulation circuit 6 includes a functional part as a decoder during reproduction and a functional part as an encoder during recording. The modulation / demodulation circuit 6 performs a demodulation process on the RLL (1, 7) PP modulation based on the reproduction clock as a decoding process at the time of reproduction. The modulation method is not limited to this, and a modulation method such as 8/16 modulation or (2,7) RLL modulation may be used.

The ECC encoder / decoder 7 performs an ECC encoding process for adding an error correction code during recording and an ECC decoding (error correction decoding) process for performing error correction during reproduction.

The ECC encoder / decoder 7 obtains reproduced data by reproducing the data demodulated by the modulation / demodulation circuit 6 into an internal memory and performing processing such as error detection / correction processing and deinterleaving during reproduction.

The ECC encoder / decoder 7 reads the data decoded to the reproduction data based on the instruction of the system controller 10. Then, the ECC encoder / decoder 7 transfers the reproduction data to an AV (Audio-Visual) system 20 based on an instruction from the system controller 10.

Also, the ECC encoder / decoder 7 gives the decoded in-data address (address unit numbers “AUN0” to “AUN3”) to the system controller 10. The system controller 10 uses the decoded in-data address for access processing or the like.

The wobble circuit 8 processes the push-pull signal output from the matrix circuit 4 as a signal related to groove wobbling. The wobble circuit 8 demodulates the push-pull signal as ADIP information by MSK (Minimum Shift Keying) demodulation / STW (Saw Tooth Wobble) demodulation. The wobble circuit 8 demodulates the data stream that constitutes the ADIP address, and then gives it to the address decoder 9.

The address decoder 9 decodes the given data to obtain an address value. The address decoder 9 gives an address value to the system controller 10.

The address decoder 9 generates a clock by PLL processing using the wobble signal given from the wobble circuit 8. The address decoder 9 supplies a clock to each unit as an encoding clock at the time of recording.

During recording, recording data is transferred from the AV system 20 to the ECC encoder / decoder 7. The ECC encoder / decoder 7 sends recording data to a memory provided therein, and buffers the recording data.

In this case, the ECC encoder / decoder 7 performs error correction code addition, interleaving, sub-code addition, and the like as encoding processing for the buffered recording data.

The data encoded by the ECC encoder / decoder 7 is given to the modulation / demodulation circuit 6. The modulation / demodulation circuit 6 performs RLL (1, 7) PP modulation on the encoded data, and supplies the modulated data to the reader / writer circuit 5.

As described above, the clock generated from the wobble signal is used as the reference clock for the encoding process during recording.

The reader / writer circuit 5 performs fine adjustment of the optimum recording power with respect to the characteristics of the recording layer, the spot shape of the laser beam, the recording linear velocity, and the adjustment of the laser pulse waveform as the recording compensation process for the recording data generated by the encoding process. Etc. The reader / writer circuit 5 gives a laser pulse to the laser driver 13 after performing the recording compensation process.

The laser driver 13 applies a laser pulse to a laser diode provided inside the optical pickup 1 to control the light emission operation of the laser. Thereby, a mark corresponding to the recording data is formed on the optical disc 100.

The laser driver 13 includes an APC (Auto Power Control) circuit, and monitors the laser output power based on the output of a laser power monitoring detector provided in the optical pickup 1, and the laser output is a temperature. Control so as to be constant regardless of the like. The target value of the laser output at the time of recording and reproduction is given from the system controller 10 to the laser driver 13. The laser driver 13 performs control so that the respective laser output levels coincide with the target values during recording and reproduction.

The servo circuit 11 generates various servo drive signals for focus, tracking, and sled according to the focus error signal and tracking error signal given from the matrix circuit 4, and executes the servo operation.

That is, the servo circuit 11 generates a focus drive signal and a tracking drive signal according to the focus error signal and the tracking error signal, and drives the focus coil and tracking coil of the biaxial mechanism provided in the optical pickup 1. .

Thereby, a tracking servo loop and a focus servo loop are formed by the optical pickup 1, the matrix circuit 4, the servo circuit 11, and the biaxial mechanism.

The servo circuit 11 executes a track jump operation by turning off the tracking servo loop and outputting a jump drive signal in response to a track jump command from the system controller 10.

Also, the servo circuit 11 generates a thread drive signal based on the thread error signal obtained as a low frequency component of the tracking error signal and access execution control from the system controller 10 and drives the thread mechanism 3.

Although not shown, the sled mechanism 3 has a mechanism constituted by a main shaft that holds the optical pickup 1, a sled motor, a transmission gear, and the like. In the sled mechanism 3, the optical pickup 1 is slid by driving a sled motor in accordance with a sled drive signal.

The spindle servo circuit 12 performs control for rotating the spindle motor 2 at CLV. The spindle servo circuit 12 acquires the clock generated by the PLL process for the wobble signal as the current rotation speed information of the spindle motor 2. The spindle servo circuit 12 compares the rotational speed information with predetermined CLV reference speed information, and generates a spindle error signal.

Further, at the time of data reproduction, a reproduction clock (clock serving as a reference for decoding processing) generated by a PLL provided in the reader / writer circuit 5 becomes the current rotation speed information of the spindle motor 2. Accordingly, the spindle error signal can be generated by comparing the recovered clock with predetermined CLV reference speed information.

The spindle servo circuit 12 outputs a spindle drive signal generated according to the spindle error signal, and operates the spindle motor 2 so as to perform CLV rotation.

The spindle servo circuit 12 generates a spindle drive signal in response to a spindle kick / brake control signal given from the system controller 10 and performs various operations such as starting, stopping, accelerating, and decelerating the spindle motor 2. Control.

The various operations of the servo system and the recording / reproducing system described above are controlled by a system controller 10 formed by a microcomputer or the like.

For example, when a writing command (write command) is issued from the AV system 20, the system controller 10 moves the optical pickup 1 to an address to be written.

Then, the system controller 10 causes the ECC encoder / decoder 7 and the modulation / demodulation circuit 6 to perform the above-described encoding process on the data transferred from the AV system 20 (for example, video data of various systems such as MPEG2 and audio data). .

Then, as described above, the laser pulse from the reader / writer circuit 5 is given to the laser driver 13 to perform recording.

In addition, when a read command for transferring predetermined data (MPEG2 video data or the like) recorded on the optical disc 100 is supplied from the AV system 20, the system controller 10 seeks for the designated address. Perform motion control. That is, the system controller 10 issues a command to the servo circuit 11 to cause the optical pickup 1 to perform an access operation targeting the address designated by the seek command.

Thereafter, the system controller 10 performs operation control necessary for transferring the data in the designated data section to the AV system 20.

That is, the system controller 10 controls the operations of the reader / writer circuit 5, the modulation / demodulation circuit 6, and the ECC encoder / decoder 7 to read data from the optical disc 100, execute decoding / buffering, etc. Forward.

The system controller 10 controls the access to a predetermined position and the recording / reproducing operation using the address in the data obtained by the ECC encoder / decoder 7 at the time of data recording / reproducing.

According to the configuration of the recording / reproducing apparatus 1000, the address in the data can be appropriately read during recording or reproduction with respect to the optical disc 100. Accordingly, it is possible to perform proper reproduction and recording operations on the optical disc 100. The details of each operation during recording or reproduction with respect to the optical disc 100 will be described later.

In FIG. 10, the recording / reproducing apparatus 1000 is connected to the AV system 20, but the target to which the recording / reproducing apparatus 1000 is connected is not limited to the AV system 20. For example, the recording / reproducing apparatus 1000 may be connected to a personal computer or the like.

Further, the recording / reproducing apparatus 1000 may be configured not to be connected to other devices. In this case, the recording / reproducing apparatus 1000 is provided with an operation unit, a display unit, and the like, and the configuration of the interface portion for data input / output is different from the configuration shown in FIG. That is, the recording / reproducing apparatus 1000 performs recording or reproduction according to a user's operation, and forms a terminal unit for inputting / outputting various data.

In addition, various configuration examples of the recording / reproducing apparatus 1000 are conceivable. The recording / reproducing apparatus 1000 may be configured as, for example, a recording-only apparatus or a reproduction-only apparatus.

<Recording process>
FIG. 11 is a flowchart showing an example of the flow of a recording operation for the optical disc 100 as a Ver3.0 disc in the recording / reproducing apparatus 1000. In the following description, the optical disc 100 on which the deformation process shown in FIG. 1 is performed will be described as an example.

The ECC encoder / decoder 7 generates address unit numbers “AUN0” to “AUN3” and flag data (flag bits “Flag Bits”) to be recorded for recording the in-data addresses on the optical disc 100 (processing S1). . Subsequently, the ECC encoder / decoder 7 performs ECC encoding (processing S2).

Next, the ECC encoder / decoder 7 uses four symbol parity (“Parity 0” to “Parity 3” for five symbols including four address unit numbers “AUN0” to “AUN3” and one flag data. )). Then, the ECC encoder / decoder 7 performs bit inversion processing on the four symbols of the address unit number “AUN2”, the address unit number “AUN0”, the parity “Parity」 3 ”, and the parity“ Parity 」1” as deformation processing for the symbols ( Process S3).

The ECC encoder / decoder 7 forms an address field 132a as an ECC encoding block for various symbols including the symbol after the bit inversion processing (processing S4). That is, the ECC encoder / decoder 7 forms an address field 132a by allocating address field bytes to the address unit number 131, flag data, and parity subjected to bit inversion processing.

The ECC encoder / decoder 7 gives an address field 132a as an ECC encoding block to the modulation / demodulation circuit 6. The modem circuit 6 generates a modulated signal by performing RLL (1, 7) PP modulation on the address field 132a (processing S5).

Then, based on the modulation signal generated in the modem circuit 6, the reader / writer circuit 5 gives a laser pulse to the laser driver 13 after performing a recording compensation process. The laser driver 13 drives a laser diode provided inside the optical pickup 1 based on the laser pulse, whereby data is recorded on the optical disc 100 (processing S6).

The above-described processes S1 to S6 are performed by the recording / reproducing apparatus 1000 which is a recording / reproducing apparatus corresponding to the Ver3.0 disc. For example, if the optical disc 100 is a recordable type, the above-described processing relating to the address is performed during recording in the recording / reproducing apparatus 1000.

Further, when a read-only type disc is assumed as the optical disc 100, the above-described processing relating to the address is performed in the mastering process of the master disc. In this case, a mastering device 700 (see FIG. 13 described later) described later is a recording device corresponding to the recording / reproducing device 1000.

<Reproduction processing>
FIG. 12 is a flowchart showing an example of the flow of processing of the reproducing operation for the optical disc 100 as the Ver3.0 disc in the recording / reproducing apparatus 1000. In the following description, the optical disk 100 on which the deformation process shown in FIG. 1 is performed will be described as an example.

(Processing S11 to S15: In the case of the recording / reproducing apparatus 1000)
Processes S11 to S15 are examples of processes when the optical disk 100 on which address recording has been performed by the above-described processes S1 to S6 is reproduced by the recording / reproducing apparatus 1000 (that is, a recording / reproducing apparatus corresponding to a Ver3.0 disk). is there.

The ECC encoder / decoder 7 demodulates the information read from the optical disc 100 via the matrix circuit 4, the reader / writer circuit 5, and the modem circuit 6 (processing S11).

Through the processing S11, the ECC encoder / decoder 7 acquires data of each address field byte constituting the address fields “AF0” to “AF15”. However, the bit inversion process is performed on the data of the predetermined address field byte by the deformation process for the symbol in the process S3 during the recording operation.

Therefore, the ECC encoder / decoder 7 performs a restoration process on the symbol. Taking the case of FIG. 1 as an example, the ECC encoder / decoder 7 includes, for example, an address unit number “AUN2”, an address unit number “AUN0”, a parity “Parity 3”, among 9 symbols constituting the address field 132a, Bit inversion processing is performed for the four symbols of the parity “Parity 1” (processing S12).

After the restoration process for the symbol in process S12, the ECC encoder / decoder 7 forms the original address field data (process S13). That is, the ECC encoder / decoder 7 obtains an address field 132a before the transformation process shown in the process S3 by performing a restoration process for the process S12. Then, the ECC encoder / decoder 7 performs ECC decoding (processing S14).

In step S14, the ECC encoder / decoder 7 correctly decodes the address information (address unit numbers “AUN0” to “AUN3”). The decoded address information is given from the ECC encoder / decoder 7 to the system controller 10 (processing S15).

That is, the ECC encoder / decoder 7 restores the symbol subjected to the deformation process to the original state in the address field 132a recorded on the optical disc 100, and performs the ECC decoding process. For this reason, the recording / reproducing apparatus 1000 can correct at least the address field of the optical disc 100 and perform at least data reproduction. That is, the recording / reproducing apparatus 1000 can at least reproduce data from the optical disc 100 (that is, a Ver3.0 disc) that cannot be reproduced by the first recording / reproducing device and the second recording / reproducing device.

(Processing S16 to S19: In the case of a recording / reproducing apparatus corresponding to a Ver 2.0 disc)
On the other hand, in steps S16 to S19, the optical disc 100 on which address recording has been performed by the above-described steps S1 to S6 is performed on the second recording / reproducing device corresponding to the Ver 2.0 disc (that is, a recording / reproducing device different from the recording / reproducing device 1000) ) Is an example of processing in the case of reproduction by (Ver2.0 compatible reproduction device).

Note that the processing S11, which is the step before the processing S16, is the same as the processing by the recording / reproducing apparatus 1000 described above, and thus the description thereof is omitted.

The ECC encoder / decoder provided in the second recording / reproducing apparatus performs a restoration process on the symbol. Taking the case of FIG. 1 as an example, the ECC encoder / decoder, for example, out of 9 symbols constituting the address field 132a, address unit number “AUN1”, address unit number “AUN0”, parity “Parity「 3 ”, parity Bit inversion processing is performed for the four symbols “Parity 2” (processing S16).

After the restoration process for the symbol in process S16, the ECC encoder / decoder forms the original address field data (process S17).

However, data of a predetermined address field byte constituting the address field 132a (address unit number “AUN2”, address unit number “AUN0”, parity “Parity 3”, parity “Parity“ 3 ”) is generated by the transformation process on the symbol in the process S3 at the time of recording. Bit field inversion processing is applied to an address field byte corresponding to “Parity 1”.

The ECC encoder / decoder performs ECC decoding. That is, ECC decoding is performed on the data of each address field byte subjected to the above bit inversion processing (address unit number “AUN2”, address unit number “AUN0”, parity “Parity 3”, parity “Parity 1”). Is performed (step S18).

When ECC decoding is performed on each address field byte, a part of the data of the address field byte constituting the address field 132a is different from the value at the time of ECC encoding (processing S2).

For example, regarding the address field “AF0”, the address unit number “AUN2”, the address unit number “AUN0”, the parity “ParityPar3”, and the address field bytes corresponding to the parity “Parity 1” “AF1, 0”, “AF3” , 0 ”,“ AF5, 0 ”, and“ AF7, 0 ”are symbol values that have been subjected to transformation processing by bit inversion processing.

The address field has an error correction capability of 2 symbols or less as described above. In this case, an error of 4 symbols occurs in the address field 132a.

Therefore, in step S18, the address information (address unit numbers “AUN0” to “AUN3”) is not correctly decoded by the ECC encoder / decoder. The error correction result is “DF” (Decode Failure: error correction failure) (processing S19).

As described above, the second recording / reproducing apparatus cannot properly read the address in the data when reproducing the optical disc 100 as the Ver3.0 disc.

Therefore, the second recording / reproducing apparatus cannot appropriately perform reproduction access to the optical disc 100, and the reproduction operation is not started. In other words, the Ver3.0 disc cannot be played back by the second recording / playback apparatus.

(Processing S20 to S22: In the case of a recording / reproducing apparatus corresponding to a Ver1.0 disc)
In steps S20 to S22, the optical disc 100 on which address recording has been performed by the above-described steps S1 to S6 is performed on the first recording / reproducing device corresponding to the Ver1.0 disc (that is, a recording / reproducing device different from the recording / reproducing device 1000). ) Is an example of processing in the case of playback by (Ver1.0 compatible playback device).

Note that the processing S11, which is the step before the processing S20, is the same as the processing performed by the recording / reproducing apparatus 1000 described above, and a description thereof will be omitted.

The ECC encoder / decoder provided in the first recording / reproducing apparatus forms the data of the original address field (process S20).

However, the data of predetermined address field bytes constituting the address field 132a (address unit number “AUN2”, address unit number “AUN0”, parity “Parity 3”, parity “ Bit field inversion processing is applied to an address field byte corresponding to “Parity 1”.

The ECC encoder / decoder performs ECC decoding. That is, data of each address field byte subjected to the above bit inversion processing (address field byte corresponding to address unit number “AUN2”, address unit number “AUN0”, parity “Parity 3”, parity “Parity 1”) In contrast, ECC decoding is performed (step S21).

When ECC decoding is performed on each address field, a part of the data in the address field constituting the address field 132a has a value different from the value at the time of ECC encoding (processing S2).

For example, regarding the address field “AF0”, the address unit number “AUN2”, the address unit number “AUN0”, the parity “ParityPar3”, and the address field bytes corresponding to the parity “Parity 1” “AF1, 0”, “AF3” , 0 ”,“ AF5, 0 ”, and“ AF7, 0 ”are symbol values that have been subjected to transformation processing by bit inversion processing.

The address field has an error correction capability of 2 symbols or less as described above. In this case, an error of 4 symbols occurs in the address field 132a.

Therefore, the address information (address unit numbers “AUN0” to “AUN3”) is not correctly decoded by the ECC encoder / decoder. The error correction result is “DF” (processing S22).

As described above, the first recording / reproducing apparatus cannot properly read the address in the data when reproducing the optical disc 100 as the Ver3.0 disc.

Therefore, the first recording / reproducing apparatus cannot appropriately perform reproduction access and recording access to the optical disc 100, and the reproduction operation is not started. In other words, the Ver3.0 disc cannot be played back by the first recording / playback apparatus.

Therefore, the recording / reproducing apparatus 1000 of this embodiment is a recording / reproducing apparatus corresponding to the optical disc 100 that is at least unreproducible in the first recording / reproducing apparatus and the second recording / reproducing apparatus. That is, it can be said that the recording / reproducing apparatus 1000 is a recording / reproducing apparatus for Ver3.0 disc.

In the case of a read-only type Ver3.0 disc, since there is no groove, by making the in-data address unreadable as described above, a recording / playback device corresponding to the Ver1.0 disc, and Ver2. Playback by the recording / playback apparatus corresponding to the 0 disk can be disabled.

In the example of FIG. 11 described above, bit inversion processing is performed for 4 symbols out of 9 symbols constituting the address field 132a in the processing S3. In this example, the correction capability of the address field is less than 3 symbol errors. Accordingly, in the process S3, the bit inversion process may be performed on at least three symbols or more.

(Mastering device 700)
The manufacturing process of the optical disc 100 is roughly divided into a master disc process (mastering process) and a disc forming process (replication process).

The master disc process is a process until a metal master disc (stamper) used in the disc making process is completed. The disc forming step is a process for mass-producing the optical disc 100 that is a duplicate of the disc using a stamper.

More specifically, the master disk process is a process in which a photoresist is applied to a polished glass substrate, and then cutting is performed to form pits or grooves on the photosensitive film by exposure with a laser beam.

In the case of the present embodiment, groove cutting by wobbling based on pre-recorded information is performed in a portion corresponding to the PB zone of the optical disc 100. Further, in the portion corresponding to the RW zone of the optical disc 100, the groove is cut by wobbling based on the ADIP address. The pre-recorded information to be recorded is prepared in a preparation process called pre-mastering.

When the cutting is completed, a predetermined process such as development is performed, and then information is transferred onto the metal surface by, for example, electroforming. As a result, a stamper necessary for disk duplication is created.

Next, using this stamper, information is transferred onto the resin substrate by, for example, an injection method. Then, after the reflective film is generated, the final product (that is, the optical disc 100) is completed by performing processing such as processing into a necessary disc shape.

FIG. 13 is a functional block diagram showing the configuration of the mastering apparatus 700 of this embodiment. The mastering apparatus 700 functions as a recording apparatus corresponding to the recording / reproducing apparatus 1000 when the optical disk 100 is a reproduction-only type disk.

The mastering device 700 includes a prerecorded information generation unit 71, an address generation unit 72, a switching unit 73, a cutting unit 74, and a system controller 70.

The prerecorded information generating unit 71 outputs prerecorded information prepared in the premastering process. The address generator 72 sequentially outputs address values as absolute addresses. The switching unit 73 is a switch that switches between a connection state between the pre-recorded information generation unit 71 and the cutting unit 74 and a connection state between the address generation unit 72 and the cutting unit 74.

The cutting unit 74 includes a laser light source 82, a modulation unit 83, and a cutting head unit 84 as optical units that perform cutting by irradiating the glass substrate 110 coated with an inorganic resist or the like with a laser beam.

The cutting unit 74 further includes (i) a signal processing unit 81 that converts input data into recording data and supplies the recording data to the optical unit, and (ii) a substrate rotation / transfer unit that rotationally drives and slides the glass substrate 110. 85, and (iii) a sensor 86 that determines whether the cutting position is in the PB zone or the RW zone from the position of the substrate rotation / transfer section 85.

The modulator 83 modulates the light emitted from the laser light source 82 based on the recording data. The modulation unit 83 includes an acousto-optic light modulator that turns on and off the light emitted from the laser light source 82 and an acousto-optic light deflector that deflects the light emitted from the laser light source 82 based on the wobble generation signal. And are provided.

The cutting head unit 84 condenses the modulated beam from the modulation unit 83 and irradiates the photoresist surface of the glass substrate 110.

The substrate rotation / transfer unit 85 includes (i) a rotation motor that rotates the glass substrate 110, (ii) a detection unit that detects the rotation speed of the rotation motor, (iii) a slide motor that slides the glass substrate 110 in the radial direction, iv) a servo controller that controls the rotational speed of the rotary motor, the rotational speed of the slide motor, the tracking of the cutting head unit 84, and the like.

The signal processing unit 81 adds an error correction code or the like to the prerecorded information or address information supplied via the switching unit 73 to form input data, and the formatting processing data Processing such as modulation signal generation processing for performing a predetermined arithmetic processing to form a modulation signal is performed.

The signal processing unit 81 also performs drive processing for driving the optical modulator and the optical deflector of the modulation unit 83 based on the modulation signal.

The cutting unit 74 slides the glass substrate 110 so that a spiral track is formed on the optical disc at a predetermined track pitch, while the substrate rotation / transfer unit 85 drives the glass substrate 110 to CLV rotation at the time of cutting.

The emitted light from the laser light source 82 is modulated with a modulated beam based on the modulation signal from the signal processing unit 81 via the modulation unit 83. The modulated beam is applied to the photoresist surface of the glass substrate 110 from the cutting head portion 84, and as a result, the photoresist is exposed based on the data or the groove.

The system controller 70 controls the operation of the cutting unit 74 at the time of cutting. In addition, the system controller 70 controls the prerecorded information generation unit 71, the address generation unit 72, and the switching unit 73 while monitoring the signal from the sensor 86.

The system controller 70 sets the slide position of the substrate rotation / transfer unit 85 to the initial position so that the cutting head unit 84 starts laser irradiation from the innermost side of the optical disc 100 at the start of cutting. Then, the system controller 70 causes the substrate rotation / transfer unit 85 to start slide transfer for forming the CLV rotation drive of the glass substrate 110 and the groove having a predetermined track pitch.

In this state, the system controller 70 causes the prerecorded information generating unit 71 to output the prerecorded information. The prerecorded information is given from the prerecorded information generating unit 71 to the signal processing unit 81 via the switching unit 73.

Further, the system controller 70 causes the laser light source 82 to start laser output, and causes the modulation unit 83 to modulate the laser beam based on the modulation signal from the signal processing unit 81 (that is, the FM code modulation signal of the prerecorded information). . In this way, the system controller 70 causes the groove cutting to be performed on the glass substrate 110. Therefore, groove cutting is performed in an area corresponding to the PB zone of the optical disc 100.

When the system controller 70 detects from the signal from the sensor 86 that the cutting operation has proceeded to a position corresponding to the PB zone, the system controller 70 switches the switching unit 73 to the address generation unit 72 side and sets an address value to the address generation unit 72. Commands to be generated sequentially.

Therefore, address information is given from the address generator 72 to the signal processor 81 via the switching unit 73. The laser light from the laser light source 82 is modulated in the modulation unit 83 based on the modulation signal from the signal processing unit 81 (that is, the modulation signal of address information). Groove cutting on the glass substrate 110 is performed by the modulated laser light.

In this way, the groove is cut in the area corresponding to the RW zone of the optical disc 100.

When the system controller 70 detects from the signal of the sensor 86 that the cutting operation has reached the end of the outer zone (RW zone), the system controller 70 ends the cutting operation in the cutting unit 74.

Thereby, on the glass substrate 110, exposed portions corresponding to the wobbling grooves are formed as the PB zone and the RW zone. Thereafter, development, electroforming, and the like are performed, and a stamper is generated. Then, the optical disc 100 is produced using the stamper.

Note that the mastering device 700 in the case of assuming a reproduction-only type disc exposes a pit row, not a wobbling groove. In this case, the laser light from the laser light source 82 is modulated according to the encoded address information and user data.

In the mastering device 700, a user data generation unit is provided instead of the prerecorded information generation unit 71. The signal processing unit 81 performs ECC encoding on the address information (address unit number) from the user data generation unit and the address generation unit 72. At this time, the processes S2 to S5 shown in FIG. 11 are performed.

Thereby, the pit row exposure of the master for producing the optical disc 100 as the Ver3.0 disc is performed. Thereafter, development, stamper manufacture, substrate creation, recording, and formation of layers such as a cover layer are performed, whereby the optical disc 100 is produced.

Then, the recording / reproducing apparatus 1000 of this embodiment is applied to the optical disc 100 produced through the above-described steps.

[Embodiment 5]
The following will describe still another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

<Configuration of playback device>
FIG. 14 is a functional block diagram showing the configuration of the recording / reproducing apparatus 5000 (reproducing apparatus) of this embodiment. The recording / reproducing apparatus 5000 is a recording / reproducing apparatus capable of reproducing not only the optical disc 100 (that is, the Ver 3.0 disc) but also the Ver 2.0 disc and the Ver 1.0 disc, and the AV system 20 provided outside. It is connected to the.

The recording / reproducing apparatus 5000 of the present embodiment has a configuration in which an address setting change unit 51 (setting selection unit) and a correctability determination unit 52 (determination unit) are further added to the recording / reproducing apparatus 1000 of the fourth embodiment. The other members of the recording / reproducing apparatus 5000 of the present embodiment are the same as those of the recording / reproducing apparatus 1000 of the fourth embodiment, and thus the same reference numerals are given and description thereof is omitted.

The recording / reproducing apparatus 5000 executes processes S31 to S38 shown in the flowchart of FIG. 15 to be described later when reproducing with respect to the optical disc (for example, the optical disc 100).

The address setting changing unit 51 gives an instruction to change the setting of address processing to the ECC encoder / decoder 7 (error correction decoding unit). That is, the ECC encoder / decoder 7 sets the Ver1.0 disk setting (first setting), the Ver2.0 disk setting (second setting), or the Ver3.0 disk in accordance with a command from the address setting changing unit 51. It operates based on any one of the address processing settings among the settings for the optical disk 100 (third setting).

Here, when the Ver1.0 disc setting is made, the ECC encoder / decoder 7 performs, for example, processes S11 and S20 to S21 performed by the ECC encoder / decoder of the first recording / reproducing apparatus. That is, the ECC encoder / decoder 7 performs ECC decoding (first error correction decoding) performed on the address field 112a.

Further, when the Ver2.0 disk setting is made, the ECC encoder / decoder 7 performs, for example, processes S11 and S16 to S18 performed by the ECC encoder / decoder of the second recording / reproducing apparatus. The ECC encoder / decoder 7 performs ECC decoding (second error correction decoding) performed on the address field 122a.

Further, when the Ver3.0 disk setting is made, the ECC encoder / decoder 7 performs the processes S11 to S14 performed by the ECC encoder / decoder 7 of the recording / reproducing apparatus 1000, for example. The ECC encoder / decoder 7 performs ECC decoding (third error correction decoding) performed on the address field 132a.

That is, it can be said that the address setting changing unit 51 selects a setting for causing the ECC encoder / decoder 7 to perform error correction decoding corresponding to each optical disc.

The correctability determination unit 52 determines whether or not the address information (address unit numbers “AUN0” to “AUN3”) is correctly decoded by ECC decoding in the ECC encoder / decoder 7. Then, the correctability determination unit 52 generates determination result information indicating the above determination result, and provides the determination result information to the system controller 10. That is, the correctability determination unit 52 determines whether or not ECC decoding has been normally performed according to the setting selected by the address setting change unit 51.

When the determination result information indicates that the address information has been correctly decoded, the system controller 10 controls each unit included in the recording / reproducing apparatus 5000 to reproduce data from the optical disc.

On the other hand, if the determination result information does not indicate that the address information has been correctly decoded, the system controller 10 issues a command to the address setting changing unit 51 to change the address processing setting of the ECC encoder / decoder 7. . That is, the address setting changing unit 51 changes the setting to the address processing setting different from the selected address processing setting when the correctability determination unit 52 determines that the ECC decoding has not been performed normally.

The ECC encoder / decoder 7 performs ECC decoding again after the address setting changing unit 51 changes the address processing setting.

If the address information is not correctly decoded by ECC decoding according to any of the Ver1.0 disk setting, the Ver2.0 disk setting, and the Ver3.0 disk setting, the correction availability determination unit 52 performs the recording. Reproduction error information indicating that the optical disk cannot be reproduced by the reproducing apparatus 5000 is given to the system controller 10.

In this case, the system controller 10 gives reproduction error information to a separately provided display unit (not shown), and causes the display unit to display the reproduction error information. Note that the display unit may be provided in the AV system 20 or may be provided in the recording / reproducing apparatus 5000.

<Disc discriminating process>
FIG. 15 is a flowchart showing an example of the flow of processing of the reproducing operation for the optical disc (for example, the optical disc 100) in the recording / reproducing apparatus 5000. Processes S31 to S38 are an example of a process for reproducing an optical disc after the recording / reproducing apparatus 5000 determines the type of the optical disc.

The address setting changing unit 51 instructs the ECC encoder / decoder 7 to change the address processing setting of the ECC encoder / decoder 7 to the Ver1.0 disk setting (processing S31).

By the processing S31, the ECC encoder / decoder 7 operates based on the Ver1.0 disk setting. The ECC encoder / decoder 7 performs ECC decoding on the address information.

The correctability determination unit 52 determines whether or not the address information is correctly decoded by ECC decoding based on the Ver1.0 disk setting (processing S32). Then, the correctability determination unit 52 generates determination result information and gives it to the system controller 10.

When the determination result information indicates that the address information has been correctly decoded (YES in process S32), the system controller 10 controls each unit included in the recording / reproducing device 5000 to reproduce data from the optical disc (process S38). ).

On the other hand, if the determination result information does not indicate that the address information has been correctly decoded (NO in step S32), the system controller 10 issues a command to the address setting changing unit 51, and the address processing of the ECC encoder / decoder 7 is performed. Are changed to Ver3.0 disk settings (step S33).

By the process S33, the ECC encoder / decoder 7 operates based on the Ver3.0 disk setting. The ECC encoder / decoder 7 performs ECC decoding on the address information.

The correctability determination unit 52 determines whether or not the address information is correctly decoded by ECC decoding based on the Ver3.0 disk setting (processing S34). Then, the correctability determination unit 52 generates determination result information and gives it to the system controller 10.

If the determination result information indicates that the address information has been correctly decoded (YES in process S34), the above-described process S38 is performed.

On the other hand, if the determination result information does not indicate that the address information has been correctly decoded (NO in step S34), the system controller 10 issues a command to the address setting changing unit 51, and the address processing of the ECC encoder / decoder 7 is performed. Are changed to Ver2.0 disk settings (step S35).

By the process S35, the ECC encoder / decoder 7 operates based on the Ver2.0 disk setting. The ECC encoder / decoder 7 performs ECC decoding on the address information.

The correctability determination unit 52 determines whether or not the address information has been correctly decoded by ECC decoding based on the Ver2.0 disk setting (processing S36). Then, the correctability determination unit 52 generates determination result information and gives it to the system controller 10.

If the determination result information indicates that the address information has been correctly decoded (YES in process S36), the above-described process S38 is performed.

On the other hand, when the determination result information does not indicate that the address information has been correctly decoded (NO in step S36), the correction availability determination unit 52 indicates that the recording / reproducing apparatus 5000 cannot reproduce the optical disc. Information is provided to the system controller 10. Then, the system controller 10 displays the reproduction error information on the display unit (processing S37).

Through the above-described processes S31 to S38, the recording / reproducing apparatus 5000 can reproduce the Ver2.0 disc and the Ver1.0 disc in addition to the optical disc 100 as the Ver3.0 disc.

That is, the recording / reproducing apparatus 5000 of the present embodiment further adds functions of a Ver2.0 compatible reproducing apparatus and a Ver1.0 reproducing apparatus to the recording / reproducing apparatus 1000 of the fourth embodiment which is a Ver3.0 compatible reproducing apparatus. It can be said that this is a recording / reproducing apparatus.

Therefore, according to the recording / reproducing apparatus 5000, there is no need to separately provide a Ver2.0 compatible reproducing apparatus and a Ver1.0 reproducing apparatus, and the recording / reproducing apparatus can be provided at a lower cost.

FIG. 15 shows an example in which the address processing setting of the ECC encoder / decoder 7 is changed in the order of Ver1.0 disk setting, Ver3.0 disk setting, and Ver2.0 disk setting. However, the order of setting address processing is not limited to this, and may be determined arbitrarily. For example, the address processing setting may be changed in the order of Ver3.0 disk setting, Ver2.0 disk setting, and Ver1.0 disk setting.

In addition, the address setting changing unit 51 may cumulatively record the number of times each address processing has been set, so that the address processing setting having a larger number of times is applied with higher priority. . With this configuration, the time required for the reproduction processing by the recording / reproducing apparatus 5000 can be reduced.

In addition, it is preferable that the order of setting address processing is determined in ascending order of reference reproduction power required for reproducing an optical disc. That is, it is preferable that the change of the address processing setting by the address setting changing unit 51 is performed in the order of the optical discs with the small intensity of the reproduction light emitted during the data reproduction. For example, in FIG. 15, it is assumed that the reproduction power required for reproducing a Ver1.0 disc is the smallest and the reproduction power required for reproducing a Ver2.0 disc is the largest.

That is, in FIG. 15, an optical disc (for example, Ver 1.0) having a smaller reproduction power by reproducing the disc in the order of Ver 1.0 disc setting, Ver 3.0 disc setting, and Ver 2.0 disc setting. It is possible to prevent a larger reproduction power (for example, a reproduction power required for reproducing a Ver 2.0 disc) from being applied to the disc.

Therefore, by determining the order of address processing setting in ascending order of the standard reproduction power, it is possible to suppress the risk that excessive reproduction power is accidentally applied to the optical disc and the data is destroyed.

[Modification]
In each of the above embodiments, in order to prevent malfunctions in the first recording / reproducing device and the second recording / reproducing device due to the optical disc 100, the optical disc 100 has at least the configurations (A) to (C). It is explained that it should be. However, the present invention is not limited to this configuration, and at least the configurations (A) and (C) may be provided. That is, it is only necessary that at least 3 symbols out of 9 symbols constituting the address field 132a are different from at least 3 symbols in the address field 112a and at least 3 symbols in the address field 122a corresponding to the 3 symbols. .

In each of the above embodiments, the address field 112a, the address field 122a, and the address field 132a include the address unit numbers 111, 121, and 131, 4 symbols of flag units, and 4 symbols of parity bits, respectively. Explains. However, the configuration of the address fields 112a, 122a, and 132a is not limited to this. If the structure of the address fields 112a, 122a, and 132a is the same, the address unit numbers 111, 121, and 131, flag bits, and parity There can be any number of symbols.

That is, it is not always necessary to have the address fields 112a, 122a, and 132a that have been subjected to error correction coding processing on the (9, 5, 5) RS code.

However, in the above case, it is necessary to perform a modification process on the address field 132a within a range that does not reach the error correction capability of the address field. For example, when the error correction capability of the address field is within 2 symbols, it is necessary that the modification process for the address field 132a is performed for 3 symbols or more. In this case, the address fields 112a, 122a, and 132a need to be composed of at least 4 symbols.

In this case, the optical disc 100 may be configured as follows. That is, the optical disc 100 is
Transformation processing is performed on at least three symbols among the four symbols constituting the address field 132a corresponding to the address field 112a.
Of at least three symbols subjected to the modification process on the address field 132a, at least one symbol is subjected to the same modification process as the modification process for the symbols constituting the address field 122a corresponding to the one symbol. And
For a symbol different from the at least one symbol, (i) when the deformation process is not performed on the symbol corresponding to the symbol and constituting the address field 122a, the deformation process is performed. Or (ii) if the deformation process is performed on the symbol corresponding to the symbol and constituting the address field 122a, at least one of the deformation process is not performed.

In summary, in the optical disc 100, the address field 132a different from the address field 112a and the address field 122a is formed by performing the deformation process on the address field 132a within a range that does not reach the error correction capability of the address field. It only has to be.

[Summary]
An information recording medium (optical disc 100) according to aspect 1 of the present invention includes:
(9, 5, 5) Among the types of information recording media having an address field subjected to error correction coding processing in the RS code and having the first version, the second version, and the third version, the type is An information recording medium as a third information recording medium which is a third version,
The information recording medium whose type is the first version is the first information recording medium (Ver1.0 disc), and the information recording medium whose type is the second version is the second information recording medium (Ver2.0 disc). In case,
Corresponding to the first address field (address field 112a) of the first information recording medium, at least 3 symbols out of 9 symbols constituting the third address field (address field 132a) of the third information recording medium. On the other hand, deformation processing has been performed,
Of at least three symbols that have undergone the transformation process on the third address field, at least one symbol is a second address field (address) of the second information recording medium corresponding to the one symbol. The same deformation process as that described above is performed on the symbols constituting the field 122a),
For at least three symbols different from the at least one symbol,
(1) If the deformation process is not performed on the symbols constituting the second address field corresponding to any of the three symbols, the deformation process is performed,
(2) When the deformation process is performed on the symbols corresponding to any of the three symbols and constituting the second address field, at least one of the deformation processes not being performed It is.

According to the above configuration, deformation processing is performed on at least 3 symbols out of 9 symbols configuring the third address field. For this reason, the information recording medium (third information recording medium) according to one aspect of the present invention is different from the address field recording method of the first information recording medium. Therefore, the third information recording medium is used as the first information recording medium. Thus, the recording / reproducing apparatus (first recording / reproducing apparatus) manufactured so as to be compatible with only the recording / reproducing apparatus can be set in a non-reproducing state.

Further, at least three of the symbols different from the at least one symbol in the third address field correspond to at least one of the above (1) and (2).

Therefore, since the third information recording medium is different from the recording method of the address field of the second information recording medium, the third information recording medium is a recording / reproducing device (first reproduction) manufactured so as to correspond only to the second information recording medium. 2 recording / reproducing apparatus) can be set in a non-reproducible state.

Therefore, malfunction in the first recording / reproducing apparatus and the second recording / reproducing apparatus due to the third information recording medium can be prevented. That is, it is possible to provide a third information recording medium that can prevent the malfunction. In other words, it can be said that a third information recording medium capable of breaking reproduction compatibility with the first recording / reproducing apparatus and the second recording / reproducing apparatus can be provided.

Also, at least one of the at least three symbols in the third address field is subjected to the same deformation process as that for the symbols constituting the second address field. Therefore, the function for the deformation process can be shared between the recording / reproducing apparatus capable of recording or reproducing the third information recording medium and the second recording / reproducing apparatus.

Furthermore, an information recording medium according to aspect 2 of the present invention is the aspect 1, wherein
The first address field, the second address field, and the third address field respectively include 4 symbols for the address unit number (111, 121, 131), 1 symbol for the flag bit, and 4 symbols for the parity,
The transformation process is performed on two symbols constituting the address unit number of the second address field corresponding to the address unit number (111) of the first address field, and the first address field The transformation process is performed on two symbols constituting the parity of the second address field corresponding to the parity of
In the third address field,
For one symbol of the address unit number (131), the same deformation process as that for the address unit number (121) of the second address field corresponding to the one symbol is performed,
Of the address unit numbers, the transformation process is performed on one symbol corresponding to one of the two symbols that are not subjected to the transformation process on the address unit number in the second address field. I,
For one symbol of the parity, the same modification process as the modification process for the parity of the second address field corresponding to the one symbol is performed,
Of the parity, the modification process is performed on one symbol corresponding to one of the two symbols on which the modification process is not performed on the parity of the second address field. Is preferred.

According to the above configuration, each of the first address field, the second address field, and the third address field includes 4 symbols for the address unit number, 1 symbol for the flag bit, and 4 symbols for the parity.

In this case, transformation processing is performed on the two symbols constituting the address unit number and parity in the second address field. Further, the same deformation process as that for the address unit number in the second address field is performed on one symbol in the address unit number in the third address field. On the other hand, among the address unit numbers in the third address field, the deformation process is performed on one symbol corresponding to one of the two symbols that have not been subjected to the deformation process on the address unit number in the second address field. Has been done. The parity processing of the third address field is also performed in the same manner as in the case of the address unit number.

That is, the second information recording medium is different in recording method from the address unit number and parity of the first information recording medium, and the third information recording medium is different from the address unit number and parity of the second information recording medium. The recording method is different.

For this reason, the third information recording medium can be set in a state incapable of being reproduced with respect to the first recording / reproducing apparatus and the second recording / reproducing apparatus. Can be reliably prevented.

Further, according to the above configuration, in the third address field, both the address unit number and the parity are subjected to transformation processing for two symbols. That is, the deformation process that is biased to either the address unit number or the parity is not performed, and the deformation process without bias is performed. Therefore, in the first recording / reproducing apparatus and the second recording / reproducing apparatus, it is possible to derive an address correction error without any deviation for each of the address unit number and the parity.

Furthermore, an information recording medium according to aspect 3 of the present invention is the aspect 2,
Among the address unit numbers in the third address field, one symbol that has undergone the same deformation process as the modification process for the address unit number in the second address field corresponding to the address unit number It is preferable that the symbol corresponds to the lowest symbol of the address unit number of the second address field.

According to the above configuration, the transformation process is performed on the symbol corresponding to the least significant symbol among the address unit numbers in the second address field, in which the transformation process is performed among the address unit numbers in the third address field. Has been done. Therefore, when the third information recording medium is loaded in the first recording / reproducing apparatus, the address unit number read from the third information recording medium cannot be incremented, so that the address of the third information recording medium is corrected. I can't.

Therefore, in the first recording / reproducing apparatus, an address correction error can be more reliably derived. Therefore, a third information recording medium capable of reliably breaking reproduction compatibility or recording compatibility with the first recording / reproducing apparatus is provided. Can be provided.

Furthermore, an information recording medium according to aspect 4 of the present invention is the aspect 2 or 3,
Among the address unit numbers in the third address field, the deformation is performed on one symbol corresponding to the lower one of the two symbols that are not subjected to the modification process on the address unit number in the second address field. It is preferable that the process is performed.

According to the above configuration, the transformation process is performed on one symbol corresponding to the lower one of the two symbols that are not subjected to the transformation process on the address unit number in the second address field. For this reason, in the second recording / reproducing apparatus, since a change in value different from that in the case where the second information recording medium is loaded occurs in the lower symbol, the address of the third information recording medium cannot be corrected.

Therefore, an address correction error can be more reliably derived in the second recording / reproducing apparatus, and therefore a third information recording medium capable of reliably breaking reproduction compatibility with the second recording / reproducing apparatus is provided. Can do.

Furthermore, the playback apparatus (recording / playback apparatus 1000, 5000) according to aspect 5 of the present invention includes:
Error correction decoding for performing error correction decoding by returning the symbol subjected to the deformation process in the third address field recorded on the third information recording medium according to any one of aspects 1 to 4 to an original state The unit (ECC encoder / decoder 7) is preferably provided.

According to the above configuration, it is possible to perform error correction decoding by returning a symbol that has undergone deformation processing in the third information recording medium to its original state.

Therefore, it is possible to correct at least the address field of the third information recording medium and perform at least data reproduction. In other words, the first recording / reproducing apparatus and the second recording / reproducing apparatus enable data reproduction processing on the third information recording medium that is handled as an information recording medium that cannot be reproduced.

Furthermore, a reproducing apparatus (recording / reproducing apparatus 5000) according to Aspect 6 of the present invention is a reproducing apparatus capable of reproducing at least the third information recording medium according to any one of Aspects 1 to 4,
First error correction decoding performed on the first address field, second error correction decoding performed on the second address field, and third error correction decoding performed on the third address field. An error correction decoding unit (ECC encoder / decoder 7) capable of performing any error correction decoding;
A first setting for causing the error correction decoding unit to perform the first error correction decoding; a second setting for causing the second error correction decoding; and a third setting for performing the third error correction decoding. A setting selection unit (address setting change unit 51) for selecting one of the third settings;
A determination unit that determines whether or not the error correction decoding has been performed normally according to any one of the first setting, the second setting, and the third setting selected by the setting selection unit (correction propriety determination) Part 52), and
The setting selection unit preferably changes the setting to a setting different from the selected setting when the error correction decoding is not performed normally.

According to the above configuration, the determination unit determines whether or not the error correction decoding by the error correction decoding unit is normally performed according to the setting selected by the setting selection unit, and the error correction decoding is normally performed. If not, the setting is changed to a setting different from the selected setting.

For example, when the first setting is selected by the setting selection unit, the error correction decoding unit performs the first error correction decoding. As a result, when the determination unit determines that the error correction decoding is not normally performed, it can be determined that the loaded information recording medium is not the first information recording medium. The setting is changed to the second setting or the third setting, and the process by the error correction decoding unit is performed.

As described above, since it is possible to perform the first to third error correction decoding suitable for the first to third information recording media, it is possible to perform the reproduction processing for the first to third information recording media. Become.

Furthermore, the playback device according to aspect 7 of the present invention provides the playback apparatus according to aspect 6,
The change of the setting by the setting selection unit is an information recording medium in which the intensity of reproduction light emitted during data reproduction is small among the first information recording medium, the second information recording medium, and the third information recording medium. It is preferable to carry out in this order.

According to the above configuration, the information recording medium is irradiated with reproduction light having an intensity greater than the intensity of reproduction light suitable for the loaded information recording medium (any of the first to third information recording media). As a result, the risk that the data recorded on the information recording medium is destroyed can be suppressed.

Furthermore, an information recording medium (optical disc 100) according to aspect 8 of the present invention is
(9, 5, 5) Among the types of information recording media having an address field subjected to error correction coding processing in the RS code and having the first version, the second version, and the third version, the type is An information recording medium as a third information recording medium which is a third version,
The second information corresponding to the first address field (address field 112a) of the first information recording medium (Ver1.0 disc) whose type is the first version is the second version information recording medium. Of the 9 symbols constituting the second address field (address field 122a) of the recording medium (Ver 2.0 disc), at least 3 symbols are subjected to deformation processing,
Of the nine symbols constituting the third address field (address field 132a) of the third information recording medium corresponding to the first address field, the deformation process is performed on at least three symbols,
Of the at least three symbols that have been subjected to the modification process for the third address field, for at least one symbol, the modification process for the symbols constituting the second address field corresponding to the one symbol; The same transformation process is performed,
For at least three symbols different from the at least one symbol,
(1) If the deformation process is not performed on the symbols constituting the second address field corresponding to any of the three symbols, the deformation process is performed,
(2) When the deformation process is performed on the symbols corresponding to any of the three symbols and constituting the second address field, at least one of the deformation processes not being performed It is.

According to the above configuration, deformation processing is performed on at least 3 symbols out of 9 symbols configuring the third address field. For this reason, since the third information recording medium is different from the recording method of the address field of the first information recording medium, the third information recording medium can be made unreproducible with respect to the first recording / reproducing apparatus. .

Further, at least three of the symbols different from the at least one symbol in the third address field correspond to at least one of the above (1) and (2).

Therefore, since the third information recording medium is different from the recording method of the address field of the second information recording medium, it is possible to make the third information recording medium unreproducible even for the second recording / reproducing apparatus.

Therefore, malfunction in the first recording / reproducing apparatus and the second recording / reproducing apparatus due to the third information recording medium can be prevented.

Also, at least one of the at least three symbols in the third address field is subjected to the same deformation process as that for the symbols constituting the second address field. Therefore, the function for the deformation process can be shared between the recording / reproducing apparatus and the second recording / reproducing apparatus that can perform the recording or reproducing process on the third information recording medium.

Furthermore, deformation processing is performed on at least 3 symbols out of 9 symbols constituting the second address field. For this reason, since the second information recording medium is also different from the recording method of the address field of the first information recording medium, the second information recording medium can be made unreproducible with respect to the first recording / reproducing apparatus.

Therefore, it is possible to prevent malfunction in the first recording / reproducing apparatus due to the second information recording medium. That is, it is possible to provide a third information recording medium capable of preventing malfunctions in the first recording / reproducing apparatus and the second recording / reproducing apparatus without changing the conventional situation in which the malfunction can be prevented.

[Others]
In addition, the present invention can also be described as follows.

(1) In the information recording medium according to one aspect of the present invention, the information in which the first version, the second version, and the third version exist, both of which perform error correction encoding of the address field with the (9, 5, 5) RS code. Among the recording medium types, the information recording medium of the third version,
The address field of the information recording medium of the second version is subjected to a transformation process of at least 3 symbols from the address field of the corresponding information recording medium of the first version among the 9 symbols of the address field,
The address field of the information recording medium of the third version has undergone at least 3 symbol transformation processing from the address field of the corresponding information recording medium of the first version among the 9 symbols of the address field,
Of the at least three symbols subjected to the deformation process in the address field of the third version information recording medium, at least one symbol is subjected to the same deformation process as the corresponding address field symbol of the second version information recording medium. And
Of the address fields of the third version information recording medium, at least three symbols among the symbols different from the symbols subjected to the same deformation process as the symbols of the corresponding address field of the second version information recording medium correspond. If the symbol of the second version address field is not transformed, the transformation process is performed. If the corresponding symbol of the second version address field is transformed, the transformation process is not performed. As described above, an address field is recorded on the information recording medium of the third version.

(2) An information recording medium according to an aspect of the present invention is the information recording medium according to (1),
The address field includes 4 symbols for the address unit number, 1 symbol for the flag bit, and 4 symbols for parity.
In the address field of the information recording medium of the second version, 2 symbols are transformed from the address unit number of the corresponding information recording medium of the first version, and 2 symbols of the parity of the information recording medium of the corresponding first version are used. The transformation process has been performed,
In the address field of the information recording medium of the third version,
One symbol of the address unit number is subjected to the same transformation process as the address unit number of the corresponding information recording medium of the second version,
Among the address unit numbers, one symbol out of the two symbols that have not undergone transformation processing on the address unit number of the corresponding second version information recording medium is transformed from the address unit number of the corresponding first version information recording medium. Processing takes place,
One symbol of the parity is subjected to the same transformation process as the parity of the corresponding information recording medium of the second version,
Among the parities, one symbol out of two symbols that has not undergone transformation processing on the parity of the corresponding second version information recording medium has undergone transformation processing from the parity of the corresponding first version information recording medium. It is preferable.

(3) An information recording medium according to an aspect of the present invention is the information recording medium according to (2) above,
In the address field of the information recording medium of the third version, among the address unit numbers, one symbol subjected to the same deformation process as the address unit number of the corresponding information recording medium of the second version is converted into the second version Preferably, it is the lowest symbol of the address unit numbers of the information recording medium.

(4) An information recording medium according to an aspect of the present invention is the information recording medium according to (2) or (3) above,
In the address field of the information recording medium of the third version, for the lower one of the two symbols of the address unit numbers that have not been transformed into the address unit number of the corresponding information recording medium of the second version It is preferable that the transformation process is performed from the address unit number of the corresponding information recording medium of the first version.

(5) A reproduction apparatus according to an aspect of the present invention performs error correction decoding by returning the transformed symbol to the original in the third version information recording medium of any one of (1) to (4) above. An error correction decoding unit is provided.

(6) A playback device according to an aspect of the present invention provides the third version of the information recording medium, the first version of the information recording medium, and / or the information recording medium according to any one of (1) to (4) above. A playback apparatus that supports playback of the information recording medium of the second version,
If any one of the corresponding information recording media is selected, an error correction decoding unit capable of error correction decoding of the address field of the information recording medium is set, and error correction decoding is impossible,
It is preferable to set an error correction decoding unit capable of performing error correction decoding of the address field of another corresponding information recording medium.

(7) In the reproduction apparatus according to one aspect of the present invention, in the above (6), it is preferable to set an error correction decoding unit for an information recording medium having the smallest reproduction power set for information reproduction.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

The present invention can be suitably used for an information recording medium that is supposed to be upgraded, such as a Blu-ray Disc (registered trademark).

7 ECC encoder / decoder (error correction decoding unit)
111 Address unit number 121 Address unit number 131 Address unit number 112a Address field (first address field)
122a Address field (second address field)
132a Address field (third address field)
100 Optical disc (information recording medium)
1000 Recording / playback device (playback device)
5000 Recording / playback device (playback device)

Claims (5)

(9, 5, 5) Among the types of information recording media having an address field subjected to error correction coding processing in the RS code and having the first version, the second version, and the third version, the type is An information recording medium as a third information recording medium which is a third version,
When the information recording medium whose type is the first version is the first information recording medium and the information recording medium whose type is the second version is the second information recording medium,
A deformation process is performed on at least three symbols out of nine symbols constituting the third address field of the third information recording medium corresponding to the first address field of the first information recording medium,
Of the at least three symbols subjected to the deformation process on the third address field, at least one symbol constitutes the second address field of the second information recording medium corresponding to the one symbol. The same deformation process as that for the symbol to be performed is performed,
For at least three symbols different from the at least one symbol,
(1) If the deformation process is not performed on the symbols constituting the second address field corresponding to any of the three symbols, the deformation process is performed,
(2) When the deformation process is performed on the symbols corresponding to any of the three symbols and constituting the second address field, at least one of the deformation processes not being performed An information recording medium characterized by the above. Each of the first address field, the second address field, and the third address field includes 4 symbols for an address unit number, 1 symbol for a flag bit, and 4 symbols for a parity,
The transformation processing is performed on two symbols constituting the address unit number of the second address field corresponding to the address unit number of the first address field, and the parity of the first address field is The transformation process is performed on two symbols constituting the parity of the second address field corresponding to
In the third address field,
For one symbol of the address unit number, the same deformation process as that for the address unit number of the second address field corresponding to the one symbol is performed,
Of the address unit numbers, the transformation process is performed on one symbol corresponding to one of the two symbols that are not subjected to the transformation process on the address unit number in the second address field. I,
For one symbol of the parity, the same modification process as the modification process for the parity of the second address field corresponding to the one symbol is performed,
Of the parity, the modification process is performed on one symbol corresponding to one of the two symbols on which the modification process is not performed on the parity of the second address field. The information recording medium according to claim 1. Among the address unit numbers in the third address field, one symbol that has undergone the same deformation process as the modification process for the address unit number in the second address field corresponding to the address unit number The information recording medium according to claim 2, wherein the information recording medium is a symbol corresponding to the lowest symbol of the address unit number of the second address field. Among the address unit numbers in the third address field, the deformation is performed on one symbol corresponding to the lower one of the two symbols that are not subjected to the modification process on the address unit number in the second address field. 4. The information recording medium according to claim 2, wherein processing is performed. 5. The error-corrected decoding is performed by returning the symbol subjected to the deformation process to the original state in the third address field recorded on the third information recording medium according to any one of claims 1 to 4. A playback apparatus comprising an error correction decoding unit.

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