JP2006228420A - Method for generating digital signal, and disk recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for generating a digital signal which can maintain compatibility both in the generation of a recording signal and in the processing of a reproduced signal with a high level while assuring error correction ability required at the time of performing high density recording and a recording medium on which a digital signal generated by the method is recorded. <P>SOLUTION: A method for generating a digital signal is characterized in that, in respect of series of recording information, a plurality of sector data are constituted by adding address information showing a position on the recording medium to a fixed recording information quantity at least, and continuous (k1×2) (k1 is a positive integer) sector data are divided into ((i) bytes×2 columns)×(j) rows ((i) and (j) are positive integers), and in respect of each of two arrays of (i) bytes×(j×k1) rows, k2 bytes of a first correcting code are generated in respect of the sequence of a code length for (j×k1) bytes and next, (q) bytes ((q) is a positive integer) of a second correcting code are generated in respect of the sequence of a code length for (i) bytes including the first correcting code so that the first and second correction arrays for (i+q) bytes×(j×k1+k2) rows can be constituted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a digital signal generation method and a disk recording medium on which a digital signal is recorded. In particular, the present invention relates to a digital signal generation method suitable for recording information on a recording medium, and the digital signal generated by this method on a recording medium. The present invention relates to a disk recording medium recorded as recording pits (marks).

  DVD (Digital Versatile Disc) is an example of a disk recording medium that converts recorded information into a digital signal suitable for recording on a recording medium and records it as recording pits (marks) on the medium. The method for generating the digital signal is described in “NIKKEI ELECTRONICS BOOKS Data Compression and Digital Modulation 1998 Edition pp.119-123”. In the digital signal generation method described here, additional information such as a sector ID number is added to the amount of recorded information in 2048 byte units (number of bytes from main data 1 to 12) subjected to scramble processing. Bytes are defined as 1 sector data, and the sector data are arranged in an array of 172 bytes × 12 rows, and PO correction in the vertical direction is performed as an outer code in an array of 172 bytes × 12 rows × 16 sectors for 16 sector data. A 16-byte PI correction code is added in the horizontal direction including a 16-byte code and a PO correction code as an inner code, thereby forming a correction block of (172 + 10) bytes × (12 rows × 16 sectors + 16 rows). Furthermore, row data including the PO correction code is distributed in units of one row to form an interleaved array. When recording on the disc, the modulation processing is performed in order from the first row of the interleaved array, and the framing processing for adding the frame synchronization signal is performed, and then recording as recording pits (marks) along the tracks on the disc. During playback, recorded pits (marks) are played back using an optical head, detected in the correction block by detecting the frame sync signal, demodulating the modulation process, restoring the interleaved array, and decoding the PI and PO correction codes The original recorded information is reproduced by correcting the error. Due to the arrangement of the row data in the correction array, the PI correction code performs error correction for a random error that occurs in units of rows, and the PO correction code corrects for a burst error that occurs across a plurality of row data.

  The correction code, arrangement, modulation method, and framing described above apply to DVD disks such as read-only disks (DVD-ROM), write-once disks (DVD-R), and rewritable disks (DVD-RW, DVD-RAM, etc.). All of the recording signals are used in common to ensure compatibility of digital signal processing during recording and reproduction.

  Hereinafter, a conventional digital signal generation method will be described with reference to FIG. FIG. 2 is a diagram showing an arrangement of data and codes for explaining a digital signal generation method when information is recorded on a conventional disk. 2A is a diagram showing recording information on the recording medium, FIG. 2B is a diagram showing sector data, FIG. 2C is a diagram showing a correction block, and FIG. ) Is a diagram showing an interleaved arrangement. In the figure, 1 indicates a series of recording information to be recorded on a recording medium, which is divided in units of 2048 bytes. Reference numeral 2 indicates a configuration of sector data that includes a part of the recording information 1 and is one of recording units on the recording medium. Sector data 2 divides a series of recording information 1 in units of 2048 bytes. Sector data 2 includes a sector ID indicating a physical recording position on the disk, an IED for correcting 1 byte for the sector ID, and additional information of 12 bytes indicating copy prohibition flag information RSV, and one sector thereafter. The recording information 1 of 2048 bytes is stored as main data 1 to 12, and further, it is composed of 2064 bytes of EDC (Error detecting code) for checking whether there is an error in the main data 2048 bytes. Further, 16 pieces of the sector data 2 are collected, and an array of a total of 172 bytes × 12 rows × 16 sectors is formed. In order to cope with burst errors and random errors caused by scratches, dust, etc. on the disc during playback of the disc in an array of 172 bytes × 12 rows × 16 sectors, an outer code and an inner code are assigned to each of the vertical and horizontal sequences. A correction block 3 is configured by adding a code. That is, 16 bytes of PO correction code are generated and added as the outer code for 12 × 16 bytes in the vertical direction, and 10 bytes of PI correction code are generated and added as the inner code for 172 bytes in the horizontal direction. Thus, a correction block 3 of 182 bytes × 208 rows is formed. Further, in the correction block 3, the first row in the array of 182 bytes × 16 rows including the PO correction code in the array unit of 182 bytes × 12 rows which is the data of the sector 15 from the data of the sector 0 including the PI correction code (10 bytes). To obtain an interleaved array 4 by performing interleaving for each row. In the interleave array 4, one byte of PO correction code is sequentially arranged between each sector, and a sector ID is arranged at the head of each sector. In each row of sector 0 to sector 15, one row of data and PI correction code is arranged.

  For the ID numbers included in each sector after interleaving, a continuous series of numbers is given, and the ID numbers are continuous in the interleaving units before and after that. Finally, modulation processing is performed in order to generate a digital signal suitable for recording as recording pits (marks) on the disc, and further, framing processing is performed by adding a synchronization signal, and then a track on the disc. It is formed as a continuous recording pit (mark).

  When reproducing recorded information from a disc, a recording pit (mark) is read by an optical head, binarized, and then detected by synchronizing signal detection in the reverse order of the digital signal generation process described with reference to FIG. After performing frame synchronization processing and demodulation processing, for example, restore the interleaved array on the semiconductor memory, and correct the error data generated in the array by performing correction processing by decoding PI and PO correction codes while deinterleaving To reproduce the original recorded information. From the data series to be encoded by the PI and PO correction codes in the correction block 3, the PI correction code is randomly generated in the row data including the continuous recording information, and the PO correction code is the continuity of the recording information. It corresponds to each of the burst error that occurs in a burst sequence extending over a plurality of lines, which is not related to the vertical series. The array in the correction block 3, the code length of the PI and PO sequences, the number of additional bytes of the PI and PO correction codes, the number of correctable bytes (symbols), that is, the correction capability is the error occurrence rate, scratches, and dust It is determined so that sufficient correction capability for adhesion can be realized.

"NIKKEI ELECTRONICS BOOKS Data Compression and Digital Modulation 1998 Edition pp.119-123"

  Disc recording media represented by DVDs will continue to improve recording density and increase transfer rates in recording media for the purpose of recording and reproducing video information for a long time and recording high-quality video information with a high transmission rate. Expected. As an example of a method for realizing an improvement in recording density and a high transfer rate, by using a short wavelength laser, a track pitch is reduced to 1 / m (m is a decimal number, m> 1) with respect to a conventional disk. Mark) length is formed to 1 / n (n is a decimal number and n> 1), or a modulation method with high encoding efficiency is employed when generating a digital signal. However, as the recording density increases, the amount of burst errors caused by scratches and dust generated on the disc in the playback signal increases, and in some cases the burst error amount exceeds the error correction capability. As a result, the readability of the disk decreases. Therefore, when performing high-density recording, it is necessary to ensure readability that can withstand scratches and dust adhesion, that is, to improve error correction capability in the digital signal to be recorded.

  However, in order to improve the error correction capability, it is possible to increase the number of correction codes, for example, simply increase the number of correction codes, or increase the number of codes to be corrected and the number of correction codes to be generated. There is a problem that a correction code that realizes the error correction capability cannot be generated, or that there is an increase in redundant data that is not related to the recording information. Further, there is a signal between each of the generation of the recording signal and the reproduction signal processing for the current DVD. There is a problem in that processing compatibility is greatly reduced.

  An object of the present invention is to solve the above-mentioned problems, maintain an error correction capability required for high-density recording, and maintain a high level of compatibility in recording signal generation and reproduction signal processing. A digital signal generating method and a recording medium on which a digital signal generated by the method is recorded are provided.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a digital signal generating method for an address indicating a position on a recording medium in a plurality of lines of main data for each set of recording information for a series of recording information. A step of configuring a plurality of sector data to which information is added; a step of distributing the main data of each sector data to divide the data into a plurality of sector data blocks; and a row direction of data in each of the divided sector data blocks Forming a plurality of correction blocks to which a first correction code for correcting the second error and a second correction code for correcting an error in the vertical direction of the data are added. In the first invention, a row of the first correction code corresponding to the main data of each row of each sector data distributed in the plurality of correction blocks is added and continuous to the plurality of main data of each sector data. And arranging each row of the plurality of second correction codes in sequence between the plurality of sector data.

  In the second invention, the digital signal generating method includes a plurality of sector data obtained by adding address information indicating a position on a recording medium to a plurality of lines of main data for each fixed recording information amount for a series of recording information. A step of distributing the address information and the odd-numbered main data of each sector data to the first sector data block, and the even-numbered main data of the sector data to the second sector data block; A first correction code and a second correction code for correcting an error in the row direction of data are added to each of the first sector data block and the second sector data block, and the first sector data block and A third correction code and a fourth correction code for correcting an error in the vertical direction of the data are added to each of the second sector data blocks and the first sector data block is added. And a step of configuring a correction block and a second correction block. In the second invention, the first data obtained by adding one row of the first correction code to the main data of each row of the first correction block, and the main data of each row of the second correction block include the first data Second data to which one row of two correction codes is added are alternately arranged, and a plurality of sector data are sequentially arranged so that the main data has continuity, and the third correction code Sequentially arranging a row and a row of the fourth correction code between the sequentially arranged sector data.

  In the third aspect of the invention, the recording medium includes a plurality of sector data in which address information indicating positions on the recording medium is added to a plurality of lines of main data for each fixed recording information amount for a series of recording information. The main data of each sector data is distributed and divided into a plurality of sector data blocks, and each of the divided sector data blocks is corrected with a first correction code for correcting an error in the row direction of the data and the vertical direction of the data. The first correction code corresponding to the main data of each row of each sector data distributed to the plurality of correction blocks from the plurality of correction blocks configured by adding the second correction code for correcting the direction error And the plurality of main data of each sector data are arranged with continuity, and each row of the plurality of second correction codes is sequentially arranged between the plurality of sector data. Digital signal configuration is recorded is modulated by.

  In the fourth invention, the recording medium comprises a plurality of sector data in which address information indicating the position on the recording medium is added to a plurality of lines of main data for each fixed recording information amount with respect to a series of recording information, The address information and odd-numbered main data of each sector data are allocated to the first sector data block, the even-numbered main data of each sector data are allocated to the second sector data block, and the first sector data block and A first correction code and a second correction code for correcting an error in the row direction of data are added to each of the second sector data blocks, and the first sector data block and the second sector data block A first correction block and a second correction block configured by adding a third correction code and a fourth correction code for correcting an error in the vertical direction of the data, respectively. To the first data obtained by adding one row of the first correction code to the main data of each row of the first correction block, and the second correction code to the main data of each row of the second correction block. The second data to which one row is added are alternately arranged, a plurality of sector data are sequentially arranged so that the main data has continuity, and the third correction code row and the fourth data A digital signal formed by arranging the rows of correction codes between the sector data arranged in sequence is recorded.

  In a fifth aspect of the invention, a digital signal generation method comprises a plurality of sector data in which at least address information indicating a position on a recording medium is added to a certain amount of recording information for a series of recording information, and is continuous (k1 X2) sector data (k1 is a positive integer) is divided into (i bytes x 2 columns) x j rows (i, j are positive integers), i bytes x (j x k1) rows For each of the two arrays, a first correction code k2 byte is generated for a code length (j × k1) byte sequence (nk1 = k2, where n is an integer), and then the first correction code is included. The first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows configured by generating the second correction code q bytes (q is a positive integer) for the code length i-byte sequence After that, at least modulation processing and synchronization signal addition processing are performed. In the fifth aspect of the present invention, the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows are configured and then distributed to at least the first and second correction arrays (k1 The processing is performed so as to form an array of (i + q) bytes × ((j × k1 + k2) × 2) rows maintaining the continuity of row data for (× 2) pieces of sector data. Further, in this process, after configuring the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows, they are distributed to at least the first and second correction arrays (k1 When configuring an array of (i + q) bytes × ((j × k1 + k2) × 2) rows by (2) pieces of sector data, row data including address information at least (j + 1) rows from the beginning of the array Are arranged and the arranged address information is processed so as to be continuous. Alternatively, after configuring the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows, at least (k1 × 2) distributed in the first and second correction arrays When the array of (i + q) bytes × ((j × k1 + k2) × 2) rows is formed with the sector data of the first sector, at least (j + 1) row intervals subsequent to the row data for the sector data Processing is performed so that the row data including the first correction code for the first and second correction arrays are alternately arranged.

  In the sixth invention, the recording medium is a digital signal generated by the method of the fifth invention and the invention subordinate thereto, along the recording track, and a recording mark or recording pit is represented by y (y is a decimal number and y ≧ 1). ) Recording at double recording density, or by changing the modulation method in the generation of a digital signal, or by combining the modulation method in the process of generating a digital signal and the reduction of recording marks or recording pits with respect to the generated digital signal Along the track, recording marks or recording pits are recorded at a recording density y (y is a decimal number, y ≧ 1) times. In a sixth aspect of the invention, the generated digital signal is recorded continuously or discontinuously along a recording track existing on the recording medium for every fixed amount of data.

  In a seventh aspect of the invention, a digital signal generating method comprises a plurality of sector data in which at least address information indicating a position on a recording medium is added to a certain amount of recording information for a series of recording information, and k continuous data The sector data (k is a positive integer) is divided into (i bytes × n columns) × j rows (i, j, n are positive integers and n is a divisor of j), and i bytes × (j For each n array of / n × k) rows, a first correction code p bytes (p is a positive integer) is generated for a code length (j / n × k) byte sequence, and then the first First correction of (i + q) bytes × (j / n × k + p) rows configured by generating a second correction code q bytes (q is a positive integer) for a code length i-byte sequence including a correction code After constructing the nth correction array from the array, at least modulation processing and synchronization signal addition processing are performed. In the seventh invention, after constructing the first to nth correction arrays of (i + q) bytes × (j / n × k + p) rows, k pieces distributed to at least the first to nth correction arrays An array of (i + q) bytes × (j × k + p × n) rows maintaining the continuity of the row data with respect to the sector data is configured. In the present invention, the first to nth correction arrays of (i + q) bytes × (j / n × k + p) rows are further configured, and then k distributed in at least the first to nth correction arrays. When an array of (i + q) bytes × (j × k + p × n) rows is composed of sector data of at least (j × k + p × n) / k row data including address information from the beginning of the array Are arranged, and the arranged address information is continuous. Alternatively, after constructing the first to nth correction arrays of (i + q) bytes × (j / n × k + p) rows, at least k sector data distributed in the first to nth correction arrays When an array of (i + q) bytes × (j × k + p × n) rows is configured, the first correction code is included at an interval of (j × k + p × n) / k rows following at least row data for sector data. The row data is arranged and the row data including the first correction codes for the first to nth correction arrays are alternately arranged. In the seventh aspect of the invention, the row data of r rows that are consecutive in the row data j rows of i bytes (i is a positive integer) unit included in the sector data and that is an additional unit of the second correction code Arranged in n columns as units (r is a positive integer and a divisor of j).

  As described above, according to the present invention, it is possible to generate a digital signal with improved correction capability for burst errors. In addition, since the same correction code and correction block arrangement can be used and there is no increase in the amount of redundant data, the compatibility of digital signal processing can be maintained at a high level. In addition, when the digital signal generated by the method according to the present invention is recorded at high density as recording marks (pits) on a disk recording medium, the burst error is efficiently distributed to a plurality of correction blocks during disk playback. Time readability can be easily secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings using some examples. FIG. 1 is a diagram showing an arrangement of data and codes for explaining a first embodiment of a digital signal generating method according to the present invention, and FIG. 1 (a) is a diagram showing recorded information on a recording medium. FIG. 1B is a diagram showing sector data, FIG. 1C is a diagram showing a correction block, and FIG. 1D is a diagram showing an interleaved arrangement. This embodiment is an example of a digital signal generation method that is suitable for performing high-density recording on a disk recording medium and that ensures compatibility with the generation of current DVD recording signals.

  In the figure, 1 is a series of recording information to be recorded on a recording medium, 2 is a configuration of sector data which includes a part of the recording information 1 and is one of recording units on the recording medium, and 5 and 6 Each of them includes a plurality of sector data 2, and shows the configuration of a first correction block and a second correction block that are units for completing a PO correction code that is an outer code and a PI correction code that is an inner code. 4 shows an interleaved array obtained by interleaving the sector data included in the second correction blocks 5 and 6 and the row data including the PO correction code.

  Details of the digital signal generation method in the first embodiment shown in FIG. 1 will be described below. The constituent elements of the sector data 2 in FIG. 1 are the same as the constituent elements of the sector data shown in FIG. When generating a digital signal to be recorded on a disk, when performing high-efficiency modulation processing, or when performing high-density recording with a reduced recording pit (mark) length, a digital signal with high error correction capability is used. While performing the generation, the compatibility with the digital signal generation method of FIG. 2 must be maintained at a high level, and the correction block at the time of reproduction is maintained while maintaining the type of correction code, the number of additional bytes, and the configuration of the correction block. This embodiment is a method of effectively distributing burst errors so as not to exceed the correction capability for.

  Therefore, in this embodiment, the sector data 2 is divided into two blocks, which are a first sector data block 2a and a second sector data block 2b. In the first sector block 2a, sector ID, IED code, RSV code and odd-numbered main data 1, 3,... 11 are arranged, and even-numbered main data 2, 4 are arranged in the second sector data block 2b. ,... 12 and EDC are arranged. When the correction block is formed, the sector ID and other additional information included in the first sector data block 2a and the odd main data 1, 3,... 11 are arranged in the first correction block 5, and the second sector The even-numbered main data 2, 4,... 12 and EDC included in the data block 2 b are arranged in the second correction block 6. The required number of sectors is 32 sector data from sector 0 to sector 31 in order to interleave two correction blocks in units of 172 bytes. Accordingly, each sector data of the sector 0 to the sector 31 is divided into two sector data blocks, which are arranged in the first correction block 5 and the second correction block 6, respectively.

  After interleaving the main data of the data of sector 0 to the data of sector 31 into the first correction block 5 and the second correction block 6, the first and second correction blocks 5 and 6 are independently the same as in FIG. The PI and PO correction codes are encoded into a correction block of 182 bytes × 208 rows having the same data amount. In the first correction block 5, 13a, 13b,... 13z, 13aa,... 13af indicate the sector ID of each sector 0 to sector 31, and 14a, 14b,. Data indicates, 15 indicates a PI correction code, and 16 indicates a PO correction code. In the second correction block 6, 17a, 17b,... 17z, 17aa,... 17af indicate data of sectors 0 to 31, 18 indicates a PI correction code, and 19 indicates a PO correction code.

  Furthermore, the result of interleaving the row data included in the PO correction codes 16 and 19 of the first and second correction blocks 5 and 6 for the purpose of avoiding burst errors with respect to the PO correction code is an interleaved array 4a. In the interleaved array 4a, 21a, 21b, ... 21z, 21aa, ... 21af are the first line of the PO correction code 16 of the first correction block 5, the first line of the PO correction code 19 of the second correction block 6, and the first line. PO correction of the first and second correction blocks 5, 6 as in the second line of the PO correction code 16 of the first correction block 5, the second line of the PO correction code 19 of the second correction block 6, and so on. The rows 16 and 19 are alternately arranged. 22a, 22b,... 22z, 22aa,... 22af are obtained by adding the rows of PI correction codes 15 and 16 to the rows of data of sector 0 to sector 31, respectively.

  In the interleaved array 4a, the 182 byte unit sector data including the PI correction codes 15 and 19 are arranged in the order of the row data corresponding to the main data 1 to 12, and the sector data includes the row data including the main data 1 to 12. It becomes a continuous arrangement. That is, the recording information 1 is rearranged in a state where the continuity is maintained. Further, row data including PO correction codes 16 and 19 included in the first and second correction blocks 5 and 6 are interleaved alternately between the sector data.

  In the case of FIG. 1, for example, the first row of row data including the PO correction code 16 in the first correction block 5 is arranged between the sector 22 data 22a and the sector 1 data 22b, and the sector 1 data 22b and sector 2 The first row of row data including the PO correction code 19 in the second correction block 6 is arranged between the second data 22c. Thereafter, the row data including the PO correction codes 16 and 19 of the first and second correction blocks 5 and 6 are alternately interleaved. After generation of the interleaved array, modulation processing and framing processing by adding a synchronization signal are performed in accordance with a modulation scheme with high encoding efficiency, high-density recording is performed by a short wavelength laser along a track on the disk, and a recording mark or Recorded as a recording pit.

  As described above, in the first embodiment, the continuous recording information 1 and the sector data including the sector ID in the 172-byte row data unit of the PI correction code addition unit, the first error correction code addition unit, By alternately distributing to the second correction blocks 5 and 6 and generating and adding PO correction codes 16 and 19 and PI correction codes 15 and 18 to the row data in the doubled 32 sector data, respectively, The same data amount and correction code as the correction block in FIG. 2 can be used as they are, and when the row data including the PO correction codes 16 and 19 are alternately interleaved, the first and second correction blocks 5 and 6 By rearranging the row data constituting each included sector data so that the continuity of the recorded information 1 is maintained, the compatibility of processing the reproduced digital signal is high. It becomes possible to maintain Le. When a burst error occurs in which data continuously becomes an error in the interleaved arrangement, the burst error can be efficiently distributed to the first and second correction blocks 5 and 6 separately, so that burst error correction can be performed without increasing redundant data. It is possible to generate a digital signal with improved performance.

  Regarding the effect of improving the correction capability due to the dispersion of burst errors in the first embodiment described above, for example, the occurrence of burst errors is the limit of the PO correction capability in the interleaved arrangement of FIG. 2, equivalent scratches that become burst errors over 16 lines, For example, dust is attached to a disc recorded at twice the recording density by reducing the recording mark (pit) length to improve the recording density and performing a highly efficient modulation system that minimizes the generation of redundant data. If it occurs, a burst error occurs over about 32 lines, twice as much. However, when the digital signal generated by the method shown in FIG. 1 is recorded, the burst error of 32 rows is distributed every 16 rows in the array of the first correction block 5 and the second correction block 6. Since the correction capability in the first and second correction blocks 5 and 6 is not exceeded, reproduction is possible. That is, the correction capability for burst errors can be doubled while using the correction code and the correction block array in FIG. 2 as they are.

  Hereinafter, a second embodiment of the digital signal generation method according to the present invention will be described with reference to FIG. FIG. 3 is a diagram showing an arrangement of data and codes for explaining a second embodiment of the digital signal generating method according to the present invention, and FIG. 3A is a diagram showing recording information on the recording medium. 3 (b) is a diagram showing sector data, FIG. 3 (c) is a diagram showing a correction block, and FIG. 3 (d) is a diagram showing an interleaved arrangement.

  In FIG. 3, the sector data 2 is divided into a first sector data block 2c, a second sector data block 2d, and a third sector data book 2e. The first sector data block 2c includes sector ID, IED, RSV and main data 4, 7, and 10. The second sector data block 2d includes main data 2, 5, 8, and 111. 3 sector data block 22e includes main data 3, 6, 9, 12 and EDC. As shown in FIG. 3B, the sector data of sector 0 to sector 47 are divided into first, second and third sector data blocks 2c, 2d and 2e, respectively. The first correction block 31 shown in FIG. 3C is configured from one sector data block 2c, and the second correction block shown in FIG. 3C is changed from the second sector data block 2d of sector 0 to sector 47. 32, and the third correction block 33 shown in FIG. 3C is configured from the third sector data block 2e of sector 0 to sector 47.

  In the first correction block 31 shown in FIG. 3 (c), 30a, 30b, 30c, ... 30z, 30aa, ... 30al indicate sector IDs of sector 0 to sector 47, and 34a, 34b, 34c, ... 34z, 34aa. 34al indicates main data of sectors 0 to 47, 35 indicates a PI correction code, and 36 indicates a PO correction code. In the second correction block 32 shown in FIG. 3 (c), 37a, 37b, 37c, ... 37z, 37aa, ... 37al are main data of sectors 0 to 47, 38 is a PI correction code, and 39 is a PO correction. The sign is shown. In the third correction block 33 shown in FIG. 3 (c), 41a, 41b, 41c, ... 41z, 41aa, ... 41al are main data of sectors 0 to 47, 42 is a PI correction code, and 43 is PO correction. The sign is shown. The data of the first to third sector data blocks 2c to 2e are arranged as the data of the sectors 0 to 47 of the first to third correction blocks 31 to 33, respectively.

  As described above, the 172-byte unit row data, which is the additional unit of the PI correction code, in the sector data including the continuous recording information 1 including the same components as in FIG. The correction blocks 31, the second correction blocks 32, and the third correction blocks 33 are arranged so as to be distributed. Since sector data is distributed to the first, second, and third correction blocks 31 to 33, 48 sector data of 16 sectors × 3 are required. By distributing the row data included in the 48 sector data and adding PO correction codes 36, 39, 43 and PI correction codes 35, 38, 42, respectively, 182 bytes × (4 rows × 48 sectors + 16 rows), That is, three correction blocks of 182 bytes × 208 rows are configured. As for the interleaving method of the row data including the PO correction codes 36, 39, and 43 after the first, second, and third correction blocks 31, 32, and 33 are generated, the unit is 182 bytes including the PI correction code as in FIG. The sector data are arranged in the order of the row data corresponding to the main data 1 to 12, and the sector data is arranged such that the row data including the main data 1 to 12 is continuous. That is, the recording information 1 is rearranged in a state where the continuity is maintained. Further, row data including PO correction codes 36, 39, and 43 included in the first, second, and third correction blocks 31 to 33 are alternately interleaved between the sector data. In the case of FIG. 3, for example, the PO correction code 36 is between the data of sector 0 and the data of sector 1, the PO correction code 39 is between the data of sector 1 and the data of sector 2, and the data of sector 2 and the data of sector 3 are The first row of row data including the PO correction code 43 is arranged between the data. Thereafter, the row data including the PO correction codes 36, 39, and 43 of the first, second, and third correction blocks 31 to 33 are sequentially and alternately interleaved.

  In this way, an interleaved array 4c is obtained. In FIG. 3D, 45a, 45b, 45c,... 45z, 45aa,... 45al are respectively the first line of the PO correction code 36, the first line of the PO correction code 39, and the first line of the PO correction code 43. The second line of the PO correction code 36, the second line of the PO correction code 39, the second line of the PO correction code 43,..., 46a, 46b, 46c,... 46z, 46aa,. -12 lines and PI correction codes 35, 38, and 42 accompanying the main data of each line are included.

  In the second embodiment, continuous recording information 1 and sector data including a sector ID are added in units of 172 bytes of PI correction code as row data units, and error correction code addition units are first, second, and second. 3 are alternately distributed to the three correction blocks 31 to 33, and the PO correction codes 36, 39, 43 and the PI correction codes 35, 38, 42 are generated and added to the row data in the triple 48-sector data. As a result, the same data amount and correction code as in the correction block of FIG. 2 can be used as they are, and when the row data including the PO correction codes 36, 39 and 43 are alternately interleaved, the first, second and second By relocating the row data constituting each sector data included in the three correction blocks 31 to 33 so as to maintain the continuity of the recorded information 1, Thereby enabling compatibility when performing the processing of digital signals at a high level. When a burst error occurs in which data continuously becomes an error in the interleaved array 4c, the burst error can be efficiently distributed to each of the first, second, and third correction blocks 31 to 33. It is possible to generate a digital signal with an improved burst error correction capability without increasing the amount of data.

  Regarding the effect of improving the correction capability by the dispersion of burst errors in the second embodiment described above, for example, the occurrence of a burst error is the limit of the PO correction capability in the interleaved arrangement of FIG. For example, a disc recorded with a recording density three times higher by a high-efficiency modulation method that reduces the length of recording marks (pits) to minimize the generation of redundant data, for example, to improve recording density. If this occurs, a burst error occurs over about 48 lines, which is three times as large. However, when the digital signal generated by the method shown in FIG. 3 is recorded, the burst error of 48 rows is 16 rows in the arrangement of the first correction block 31, the second correction block 32, and the third correction block 33. Since the correction capability in the first, second, and third correction blocks 31 to 33 is not exceeded, reproduction is possible. That is, the correction capability for burst errors can be improved by a factor of three while using the correction code and correction block arrangement in FIG. 2 as they are.

  Accordingly, the correction data from the first to the nth (n is a divisor with respect to the number of rows of the row data included in the sector data) of the row data of 172 bytes in the sector data including the continuous recording information 1 in the recording order of the main data. When 16 × n sectors are required, the correction capability of the generated digital signal is improved n times compared to FIG.

  Next, a third embodiment of the digital signal generation method according to the present invention will be described with reference to FIG. FIG. 4 is a diagram showing an arrangement of data and codes for explaining a second embodiment of the digital signal generating method according to the present invention, and FIG. 4 (a) is a diagram showing recording information on the recording medium. 4 (b) is a diagram showing sector data, FIG. 4 (c) is a diagram showing a correction block, and FIG. 4 (d) is a diagram showing an interleaved arrangement.

  As shown in FIG. 4B, the sector data 2 is divided into a first sector data block 2f and a second sector data block 2g. Sector ID, IED, RSV and main data 1, 2, 5, 6, 9, 10 are arranged in the first sector data block 2f, and main data 3, 4, 7 are arranged in the second sector data block 2g. , 811, 12 and EDC are arranged. The first correction block 49 is configured by adding a PI correction code and a PO correction code to the main data and additional information such as a sector ID included in the first sector data block 2f, and the second correction block 50 is The PI correction code and the PO correction code are added to the main data and EDC included in the second sector data block 2g.

  In the first correction block 49 shown in FIG. 4C, 51a, 51b, 51c, ... 51z, 51aa, ... 51af are sector IDs, and 52a, 52b, 52c, ... 52z, 52aa, ... 52af are sectors 0. To sector 31. These sector data 52a, 52b, 52c,... 52z, 52aa,... 52af include the IED shown in the first sector data block 2f in FIG. RSV and main data are included. 53 is a PI correction code, and 54 is a PO correction code. In the second correction block 50, 63a, 63b, 63c,... 63z, 63aa,... 63af are data of sector 0 to sector 31, and 63a, 63b, 63c, ... 63z, 63aa,. The sector data includes main data and EDC shown in the second sector data block 2g in FIG. 64 is a PI correction code, and 65 is a PO correction code.

  As described above, in the third embodiment, sector data of 172 bytes × 2 rows, which is an additional unit of the PI correction code, is included in the sector data including the continuous recording information 1 including the same components as in FIG. The first correction block 49 and the second correction block 50 are arranged so as to be distributed in the data recording order. In order to distribute the sector data to the first and second correction blocks 49 and 50, 32 sector data of 16 sectors × 2 are required. By distributing row data included in 32 sector data and adding PO correction codes 54 and 65 and PI correction codes 53 and 64, 182 bytes × (6 rows × 32 sectors + 16 rows), that is, 182 bytes × Two correction blocks of 208 rows are configured.

  As for the interleaving method of the row data including the PO correction codes 54 and 65 after the generation of the first and second correction blocks 49 and 50, sector data of 182 bytes including PI correction codes 53 and 64 as in FIG. Are arranged in the order of the row data for the main data 1 to 12, and the sector data is arranged such that the row data including the main data 1 to 12 is continuous. That is, the recording information 1 is rearranged in a state where the continuity is maintained. Further, the row data including the PO correction codes 54 and 65 included in the first and second correction blocks 49 and 50 are alternately interleaved between the sector data. In the case of FIG. 4, for example, the first row of the row data including the PO correction code 54 in the first correction block 49 is arranged between the data of the sector 0 and the data of the sector 1, and between the data of the sector 1 and the data of the sector 2 The first row of the row data including the PO correction code 65 in the second correction block 50 is arranged. Thereafter, the row data including the PO correction codes 54 and 65 from the first and second correction blocks 49 and 50 are interleaved sequentially and alternately.

  By configuring in this way, the interleaved array 4d shown in FIG. 4D is obtained. In the interleaved array 4d, 57a, 57b, 57c,... 57z, 57aa,... 57af indicate the data of sector 0 to the data of sector 31, and each sector data 57a, 57b, 57c, ... 57z, 57aa,. RSV, main data 1 to main data 12, EDC and PI correction codes 53 and 64 are included. 56a, 56b, 56c,... 56z, 56aa,... 56af are the first line of the PO correction code 54, the first line of the PO correction code 65, the second line of the PO correction code 54, the second line of the PO correction code 65, Are arranged in sequence like

  As described above, in the third embodiment, the continuous recording information 1 and the sector data including the sector ID are added in units of 172 bytes of PI correction code in units of 2 rows, and the first unit of error correction code. By alternately distributing to the second correction blocks 49 and 50 and generating and adding PO correction codes 54 and 65 and PI correction codes 53 and 64 to the row data in the doubled 32-sector data, respectively. 2, the same data amount and correction code can be used as they are, and when the row data including the PO correction codes 54 and 65 are alternately interleaved, the first and second correction blocks 49 and 50 are used. Then, the reproduced digital signal is processed by rearranging the row data constituting each sector data included therein so as to maintain the continuity of the recorded information. Compatibility at a high level allows maintenance of. When a burst error occurs in which data continuously becomes an error in the interleaved arrangement, the burst error can be distributed to each of the first and second correction blocks 49 and 50, so that the burst error correction capability without increasing redundant data. It is possible to generate a digital signal that improves the above. The interleave unit of the row data included in the sector data is not limited to the unit of 172 bytes × 2 rows, and if distributed to two correction blocks, 172 bytes × 3 rows, 172 bytes × 6 rows, A divisor for the calculation result of (number of rows of row data to divide sector data) / (number of correction blocks to be generated) can be considered. In the case of the third embodiment, it can be considered that the number of rows is a divisor of 12 rows ÷ 2 = 6.

  Regarding the effect of improving the correction capability by the dispersion of burst errors in the third embodiment described above, for example, the occurrence of burst errors is the limit of PO correction capability in the interleaved arrangement of FIG. 2, equivalent scratches that become burst errors over 16 lines, For example, dust is attached to a disc recorded at a recording density of 3 times by reducing the recording mark (pit) length to improve the recording density and performing a high-efficiency modulation method that minimizes the generation of redundant data. If it occurs, a burst error occurs over about 32 lines, twice as much. However, when the digital signal generated by the method shown in FIG. 4 is recorded, the burst error of 32 rows is distributed to the arrangement of the first correction block 49 and the second correction block 50, thereby generating the generated digital signal. The signal error correction capability can be improved.

  In the first, second, and third embodiments described above, when it is necessary to further improve error correction capability by maintaining readability or adopting a high-efficiency modulation method, Without changing the number of correction codes for the vertical and horizontal sequences, the coding method for adding correction codes with higher correction capability to the same code length and adding the code lengths of the vertical and horizontal sequences In some cases, the number of correction codes is increased without change. In this case, although the amount of data constituting each correction block changes, generation of a digital signal with improved burst error correction capability by combining with a method of distributing data in correction array sector data into a plurality of correction blocks as in the embodiment Is possible.

  Further, the method of distributing the sector data in the correction array to the plurality of correction blocks is not limited to the method in the first, second, and third embodiments as long as the purpose is to improve the correction capability. The row data that is included and is a distribution unit may be distributed to a plurality of correction blocks. Therefore, the arrangement order of the sector data when forming the correction block and the arrangement order of the row data including the main data in the arranged sector data need not be concerned with the continuity of the recording information. In addition, regarding the arrangement after interleaving of the row data including the PO correction code, it is not necessary to stick to the continuity of the recording information in the sector data. The row data including the sector ID is regularly arranged because it is necessary for knowing the position on the disk at the time of reproduction, but the other row data is within the sector data and further within the range where the correction processing is completed. You may arrange arbitrarily.

  As described above, according to the present invention, sector data, which is one of the constituent units of a digital signal including a series of recording information, is arranged so as to be distributed in a plurality of correction blocks, and a plurality of correction codes are generated by generating correction codes. By constructing the correction block, it is possible to generate a digital signal with improved correction capability for burst errors.

  Furthermore, since the same correction code and correction block arrangement can be used and there is no increase in the amount of redundant data, the compatibility of digital signal processing can be maintained at a high level.

  Also, since the digital signal generated by the method of the present invention is recorded at high density as recording marks (pits) on the disk recording medium, burst errors are efficiently distributed to a plurality of correction blocks during disk reproduction. It is possible to easily ensure readability during reproduction.

It is a figure which shows the arrangement | sequence of the data and code | symbol for demonstrating the 1st Example of the digital signal generation method by this invention. It is a figure which shows the arrangement | sequence of the data and code | symbol for demonstrating the digital signal generation method at the time of recording information on the conventional disc. It is a figure which shows the arrangement | sequence of the data and code | symbol for demonstrating the 2nd Example of the digital signal generation method by this invention. It is a figure which shows the arrangement | sequence of the data and code | symbol for demonstrating the 2nd Example of the digital signal generation method by this invention.

Explanation of symbols

1 ... L recording information, 2 ... sector data, 3 ... correction block, 4 ... interleaved array, 5 ... first correction block, 6 ... second correction block, 7 ... third correction block.

Claims (12)

  For a series of recording information, a step of forming a plurality of sector data obtained by adding address information indicating a position on a recording medium to a plurality of lines of main data for each fixed recording information amount, and the main data of each sector data Are divided into a plurality of sector data blocks, a first correction code for correcting an error in the row direction of the data in each of the divided sector data blocks, and a first error code for correcting an error in the vertical direction of the data. And a step of forming a plurality of correction blocks to which two correction codes are added.   2. The digital signal generation method according to claim 1, wherein a row of the first correction code corresponding to the main data of each row of each sector data distributed in the plurality of correction blocks is added and the sector data of the sector data is added. A digital signal comprising: arranging a plurality of main data with continuity; and sequentially arranging each row of the plurality of second correction codes between the plurality of sector data. Generation method.   For a series of recording information, for each fixed recording information amount, a step of configuring a plurality of sector data obtained by adding address information indicating a position on a recording medium to a plurality of lines of main data, and address information of each sector data Allocating odd-numbered main data to the first sector data block, allocating even-numbered main data of each sector data to the second sector data block, and the first sector data block and the second sector A first correction code and a second correction code for correcting an error in the row direction of the data are added to each data block, and the vertical direction of the data is added to each of the first sector data block and the second sector data block. The first correction block and the second correction block are configured by adding the third correction code and the fourth correction code for correcting the direction error. Method for generating a digital signal, characterized in that it comprises a step.   4. The digital signal generating method according to claim 3, wherein the first data obtained by adding one row of the first correction code to the main data of each row of the first correction block and each row of the second correction block. Alternately arranging second data obtained by adding one row of the second correction code to the main data, and sequentially arranging a plurality of sector data so that the main data has continuity; A method of generating a digital signal, comprising: sequentially arranging a third correction code row and the fourth correction code row between the sequentially arranged sector data.   For a series of recording information, a plurality of sector data, in which address information indicating the position on the recording medium is added to a plurality of lines of main data for each fixed recording information amount, and the main data of each sector data is distributed. A first correction code for correcting an error in the row direction of the data and a second correction code for correcting an error in the vertical direction of the data in each of the divided sector data blocks. The first correction code row corresponding to the main data of each row of each sector data distributed in the plurality of correction blocks is added from the plurality of correction blocks configured by adding The plurality of main data are arranged with continuity, and each row of the plurality of second correction codes is sequentially arranged between the plurality of sector data. Recording medium characterized by recording by modulating the digital signal.   For each set of recording information, a plurality of sector data is formed by adding address information indicating the position on the recording medium to a plurality of lines of main data for each fixed recording information amount. The main data is allocated to the first sector data block, the even-numbered main data of each sector data is allocated to the second sector data block, and each of the first sector data block and the second sector data block is allocated. A first correction code and a second correction code for correcting an error in the row direction of data are added, and an error in the vertical direction of data is corrected in each of the first sector data block and the second sector data block The first correction block includes the first correction block and the second correction block configured by adding the third correction code and the fourth correction code to be added. First data in which one row of the first correction code is added to the main data in each row, and second data in which one row of the second correction code is added to the main data in each row of the second correction block A plurality of sector data are sequentially arranged so that the main data has continuity by alternately arranging data, and the third correction code row and the fourth correction code row are sequentially arranged. A recording medium on which a digital signal constituted by arrangement between the sector data is recorded.   A plurality of sector data in which at least address information indicating a position on the recording medium is added to a certain amount of recording information with respect to a series of recording information, and (k1 × 2) continuous (k1 is a positive integer) sectors The data is divided into (i bytes × 2 columns) × j rows (i and j are positive integers), and the code length (j ×) for each of two arrays of i bytes × (j × k1) rows. k1) First correction code k2 bytes are generated for the byte sequence (nk1 = k2, where n is an integer), and then the second correction code q for the code length i-byte sequence including the first correction code After forming the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows configured by generating bytes (q is a positive integer), at least modulation processing and synchronization signal addition processing are performed. A method for generating a digital signal, comprising:   8. The method of generating a digital signal according to claim 7, wherein after configuring the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows, at least the first and second correction arrays. An array of (i + q) bytes × ((j × k1 + k2) × 2) rows maintaining continuity of row data for (k1 × 2) sector data distributed in Generation method.   9. The method of generating a digital signal according to claim 8, wherein after configuring the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows, at least the first and second correction arrays. When an array of (i + q) bytes × ((j × k1 + k2) × 2) rows is composed of (k1 × 2) sector data distributed in the array, at least (j + 1) rows from the beginning of the array A method of generating a digital signal, characterized in that row data including address information is arranged and the arranged address information is continuous.   9. The method of generating a digital signal according to claim 8, wherein after configuring the first and second correction arrays of (i + q) bytes × (j × k1 + k2) rows, at least the first and second correction arrays. When an array of (i + q) bytes × ((j × k1 + k2) × 2) rows is composed of (k1 × 2) sector data distributed in a row, at least (j + 1) following the row data for the sector data The digital data is characterized in that row data including the first correction code is arranged at a row interval, and row data including the first correction code for the first and second correction arrays are alternately arranged. How to generate a signal.   A digital signal generated by the digital signal generation method according to any one of claims 7 to 10 is recorded along a recording track with a recording mark or a recording pit at a recording density of y (y is a decimal number and y≥1) times. Or by changing the modulation method in the generation of the digital signal, or by combining the modulation method in the generation process of the digital signal and the reduction of the recording mark or the recording pit with respect to the generated digital signal, A disk recording medium characterized in that recording pits are recorded at a recording density y (y is a decimal number, y ≧ 1) times as many times. 12. The recording medium according to claim 11, wherein the generated digital signal is recorded continuously or discontinuously along a recording track existing on the recording medium. Recording media to be used.

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