KR20030068250A - Optical recording media recorded wobble address data, and wobble address data encoding/decoding method and apparatus of the media - Google Patents

Abstract

PURPOSE: An optical recording medium where a wobble address is recorded, and a method and an apparatus for encoding and decoding wobble address data of the same are provided to prevent an error generated by data missing in playing the optical recording medium by inserting data bit number information into data units. CONSTITUTION: Twelve NWL(Nominal Wobble Length)s of each data unit are selected and divided into two groups. The NWLs included in each NWL group are expressed in the identical wobble shape. By combining wobble shape patterns of the NWL groups, four information is expressed. The data start reference unit includes nibble number information which is data group order information. Order information is included in address data by data bit units.

Description

Optical recording media recorded wobble address data, and wobble address data encoding / decoding method and apparatus of the media}

The present invention relates to an optical recording medium having an abbreviated address recorded therein, and a method and apparatus for encoding / decoding address data of the optical recording medium.

In general, in an optical disc, such as a recordable optical disc, such as a DVD-RAM, physical address information must be recorded in advance on a recording surface of the optical disc in order to find a random access or data recording position. A method of recording physical address information in advance is as follows.

First, in the case of DVD-RAM, a Complementary Allocated Pit Addressing (CAPA) method is used to record address information of each sector in a pre-pit form at the head of each sector for physical addressing. In this case, each sector Although there is an advantage in that addressing is possible, address information is recorded in sectors in the data recording area in which the actual data is to be recorded, thereby reducing the data recording capacity in which the actual data is to be recorded.

On the other hand, in the case of the next generation high-density optical disk, a wobble addressing method using a minimum shift keying (MSK) modulation method has been recently proposed. This MSK wobble system is composed of a monotone wobble (MW) of minimum wobble length (NWL) and an MSK mark wobble of 3 NWL size as shown in FIG. Monotone wobbles of the minimum wobble lengths (NWL1, NWL2, NWL6, NWL7) and the wobble of the minimum wobble length (NWL4) constituting the MKS mark wobble are opposite in phase, and the minimum wobble length (NWL3) constituting the MKS mark wobble. The wobble of and the wobble of the minimum wobble length NWL4 constituting the MKS mark wobble also have opposite phases. Further, the monotone wobble of the minimum wobble lengths NWL1, NWL2, NWL6, and NWL7 and the wobble of the minimum wobble length NWL4 constituting the MKS mark wobble have the same wobble frequency f _wob and the minimum constituting the MKS mark wobble. The wobble of the wobble lengths NWL3 and NWL5 has a frequency (1.5 × f _wob ) higher than the wobble frequency f _wob . As described above, the MSK (Minimum Shift Keying) modulation method is composed of a combination of four wobbles of different frequencies and phases.

In addition, recently, in the wobble addressing method using minimum shift keying (MSK) modulation, a method of transforming the monotone wobble of FIG. 1 into saw-tooth wobble as shown in FIG. 2 has been proposed to express specific information. . In this sawtooth wave wobble, information of " 0 " and " 1 " is represented by two consecutive wobbles of the same phase having a triangle wave shape at two minimum word lengths NWL2 and NWL3. The sawtooth wobble "0" and the sawtooth wobble "1" have a phase opposite to each other.

In the wobble addressing method using the minimum shift keying (MSK) modulation, eight types of address in pre-groove word (ADIP) units, that is, a monotone unit and a data start indication information unit (shown in FIG. The address data is represented by the reference unit, the sync signal units sync_0 unit to sync_3 unit, and the data units data_0 unit to data_1 unit. Each unit has a size of 56 minimum wobble lengths NWL, and the first to third minimum wobble lengths NWL of each unit are all composed of the MSK mark wobbles shown in FIG. The monotone unit includes all the remaining minimum length wobbles other than the first to third minimum wobble lengths (NWL) as monotone wobbles, and the data start reference unit includes the first to third minimum wobbles. In addition to the length NWL, the 19th to 55th minimum wobble lengths among the minimum wobble lengths are configured as sawtooth wobble "0", and all remaining minimum wobble lengths are configured as monotone wobbles. In addition, the sync signal unit sync_0 unit has MSK mark wobble in the 17th to 19th and 27th to 29th minimum wobble lengths NWL in addition to the first to third minimum wobble lengths NWL. All remaining minimum wobble lengths are composed of monotone wobbles, and the sync signal unit sync_1 unit to sync_3 unit includes two MSK mark wobbles located in addition to the first to third minimum wobble lengths NWL. ) Is shifted by two minimum wobble lengths in order from the minimum wobble length of In addition, the data unit (data_0 unit) has the MSK mark wobble at the 15th to 17th minimum wobble length in addition to the first to third minimum wobble lengths (NWL), and the 19th to 55th minimum wobble lengths are sawtooth wobble " 0 "and all remaining minimum wobble lengths consist of monotone wobbles, and the data unit (data_1 unit) has MSK mark wobble at the 13th to 15th minimum wobble lengths in addition to the first to third minimum wobble lengths (NWL) The 19th to 55th minimum wobble lengths are located in the sawtooth wobble " 1 " and all the remaining minimum wobble lengths are configured in monotone wobble. The reason why the sawtooth wobble " 0 " or the sawtooth wobble " 1 " is inserted is to allow the decoder to recognize the sawtooth wobble and distinguish the type of ADIP unit even when the MSK mark is missed during playback.

The ADIP word structure by the ADIP units configured as described above may be represented by a table as shown in FIG. That is, the monotone unit is located in ADIP unit numbers 0, 2, 4, and 6, the sync signal units sync_0, sync_1, sync_2, and sync_3 are located in ADIP unit numbers 1, 3, 5, and 7, respectively. The data unit (data_01, data_02, data_01, data_00) is located in each of the four ADIP unit numbers 9-12 following the reference unit and 14 data in the subsequent ADIP unit numbers 13-82. A group (one data start indication information unit and four data units constitute one data group) is located. Each data unit represents one bit of data, one nibble, or four bits, by one data group, and 15 nibbles, or 60 bits, by one ADIP word structure.

The ADIP word structure configured as described above is reconstructed by extracting only nibble data in an error correction (ECC) decoder as shown in FIG. One Error Correction (ECC) block consists of a total of 15 nibbles consisting of 9 nibbles of data and 6 nibbles of parity. The data is 6 nibbles of ADIP address consisting of 3 bits of a layer, 19 bits representing a recording unit block (RUB), 2 bits representing an address number, and 3 nibbles of auxiliary data of 12 bits. It consists of (Aux data). The parity consists of, for example, six nibble parities used as parity for nibble unit Reed-Solomon error correction.

In the conventional wobble addressing method using a minimum shift keying (MSK) modulation method, the pattern of the data unit is composed of two types (that is, data_0 and data_1), as shown in FIG. Or data_1) is classified by the data start reference unit reference 0 to reference 14. Accordingly, in the wobble addressing method using the conventional minimum shift keying (MSK) modulation method, the data number (that is, the order of how many bits) cannot be known only by the decoded data unit.

Thus, for example, when the data unit data_02 of ADIP unit No. 10 in the ADIP word structure of Fig. 4 is missed due to physical damage or the like of the optical recording medium at the time of reproduction of the optical recording medium, the decoding block may be an example. For example, as shown in FIG. 6, the data unit (data_01) is placed in ADIP unit number 10 and the data unit (data_00) is placed in ADIP unit number 11, and the data unit AD12 is insufficient. Padding with 0 "or data" 1 "minimizes the decoding error nibble (three nibbles in this example), and the recovery of the decoding error nibble is passed to the share of the error correction (ECC) block.

As described above, in the wobble addressing method using the conventional MSK modulation method, since each of the patterns of the data units (data 0 and data 1) are all formed in the same pattern as shown in FIG. If a unit is missed at the time of reproduction of the optical recording medium, there is a problem that at least two decoding error nibbles are generated because it is not immediately known which data unit is missing. As the load of the error correction (ECC) decoding block is increased, the wobble addressing method using the conventional MSK modulation method has a problem in that it is impossible to perform faster and more stable decoding of the error correction decoding block.

Accordingly, an object of the present invention is to provide an optical recording medium in which wobble-shaped address data is included and recorded in order to solve the above problems.

Another object of the present invention is to provide a method and apparatus for encoding an optical recording medium which encodes the address data to be recorded on the optical recording medium recorded on the wobble-shaped address data and includes the order information of bit unit data. .

It is still another object of the present invention to provide a method and apparatus for decoding the address data during reproduction of an optical recording medium in which wobble-shaped address data includes order information of bit unit data.

Another object of the present invention is to provide an optical recording medium in which wobble-shaped address data is included and the order information of data group units is recorded together with the order information of bit unit data.

It is still another object of the present invention to provide an optical recording medium which encodes the address data to be recorded on the wobble-shaped address data, including the order information of the data group unit together with the order information of the bit unit data. It is an object of the present invention to provide an encoding method and apparatus.

Still another object of the present invention is to provide a method and apparatus for decoding the address data during reproduction of an optical recording medium in which wobble-shaped address data includes data group unit order information together with order information of bit unit data. To be.

1 is a view showing a wobble signal waveform of a minimum shift keying (MSK) modulation method recorded on an optical disc as a recordable optical recording medium;

FIG. 2 is a view illustrating a sawtooth wobble signal waveform of the MSK modulation method in which the sawtooth waveform is included in the waveform of FIG. 1;

FIG. 3 is a diagram for describing types of an address in pre-groove word (ADIP) unit represented by a wobble signal waveform of a minimum shift keying (MSK) modulation method of FIGS. 1 and 2;

4 is a table illustrating an ADIP word structure configured by the ADIP units of FIG. 3;

FIG. 5 is a table showing a structure of an error correction (ECC) block constituted by data units in the table of FIG. 4;

FIG. 6 illustrates a problem that occurs in the decoder side when data misses due to physical damage of the optical recording medium in the ADIP word of FIG. 4 when the address data recorded on the optical recording medium is reproduced in the manner of FIG. Drawings to explain,

FIG. 7 is a view for explaining an interval between MSK marks included in types of an Address In Pre-Groove Word (ADIP) unit of FIG. 3;

8 is a diagram for describing methods of writing bit order information to a data unit among ADIP units according to the first embodiment of the present invention;

FIG. 9 is a view showing a format example of nibble order information when nibble order information is recorded in the data unit according to the presence or absence of sawtooth wobble in the data unit of FIGS. 8A and 8B;

FIG. 10 is a view showing a format example of nibble order information in the case where nibble order information is recorded by the sawtooth wobble "1" and the sawtooth wobble "0" in the data unit; FIG.

FIG. 11 is a table showing an ADIP word structure including the data unit of FIG. 8; FIG.

FIG. 12 shows the physical recording of an optical recording medium in an ADIP word at the time of reproduction of address data in an optical recording medium in which data data is included in the data unit and data bit order information is encoded by the method according to the first embodiment of the present invention. Conceptual diagram for explaining a method of decoding on the decoder side when missing data due to damage or the like,

13 is a block diagram of an address data encoding apparatus of an optical recording medium according to a first embodiment of the present invention;

14 is a block diagram of an address data decoding apparatus of an optical recording medium according to a first embodiment of the present invention;

FIG. 15 illustrates methods for recording nibble order information (data group order information) in a data start reference unit together with bit order information in a data unit among ADIP units according to a second embodiment of the present invention. Drawings to explain,

FIG. 16 shows an example of the format of nibble sequence information in the case of recording nibble sequence information (data group sequence information) in the data start instruction unit in FIG. 15 (A) and (B) with or without sawtooth wobble. Figure,

FIG. 17 is a view showing a format example of nibble order information in the case where nibble order information is recorded by sawtooth wobble "1" and sawtooth wobble "0" in a data unit; FIG.

18 is a table showing an ADIP word structure including the data unit of FIG. 8 and the data start reference unit of FIG. 15;

FIG. 19 encodes address data by including data bit order information in the data unit and nibble order information (data group order information) in the data start indication information unit by the method according to the second embodiment of the present invention. Is a diagram for explaining a method of decoding at the decoder side when data misses due to physical damage of an optical recording medium or the like in an ADIP word when the address data is reproduced in an optical recording medium having recorded therein;

20 is a block diagram of an address data encoding apparatus of an optical recording medium according to a second embodiment of the present invention;

21 is a block diagram of an address data decoding apparatus of an optical recording medium according to a second embodiment of the present invention;

FIG. 22 is a diagram for explaining a method of decoding at a decoder side when data misses due to physical damage of an optical recording medium or the like in an ADIP word during reproduction of address data by a conventional method; FIG.

FIG. 23 is a diagram for describing a method of decoding at the decoder side when data misses due to physical damage of an optical recording medium in an ADIP word during reproduction of address data according to a second embodiment of the present invention. .

※ Explanation of code for main part of drawing

10: data bit order information processing unit

15: nibble (data group) order information processing unit

20: wobble modulation processor 30: wobble signal recording unit

40: optical disc 50: wobble signal reader

60: wobble demodulation processing section 65: data bit order information detection section

70: nibble (data group) order information detection unit

80: wobble signal decoder

In the optical recording medium according to an embodiment of the present invention for achieving the above object, in a writable optical recording medium having a wobble-shaped groove, a unit of bit data in the address data represented by the wobble shape of the groove Bit order information is included and recorded.

The optical recording medium according to another embodiment of the present invention is characterized in that, in the optical recording medium of the above embodiment, group order information is additionally recorded in the address data in units of predetermined data groups.

The wobble address data encoding method of an optical recording medium according to an embodiment of the present invention generates wobble address signal data represented by a wobble shape of the groove to be recorded on an optical recording medium on which a wobble shaped groove is formed and recorded. A first step of doing; Inserting bit order information for each bit data unit into the wobble address signal data; And a third step of modulating the wobble address signal data into which the sequence information is inserted into a form that can be recorded on the optical recording medium.

Further, in the wobble address data encoding method of the optical recording medium according to another embodiment of the present invention, in the second step, in the second step, group order information is added to the wobble address signal data in predetermined data group units. And inserting and modulating the wobble address signal data into which the bit order information and the group order information are inserted in the third step in a form that can be recorded on the optical recording medium.

The wobble address data encoding apparatus of the optical recording medium according to an embodiment of the present invention generates address signal data represented by the wobble shape of the groove to be recorded on the optical recording medium on which the wobble shaped groove is formed and recorded. Address signal generating means; Order information insertion means for inserting bit order information for each bit data unit into the wobble address signal data; And wobble signal modulation means for modulating the wobble address signal data into which the sequence information is inserted into a form that can be recorded on the optical recording medium.

The wobble address data encoding apparatus of the optical recording medium according to another embodiment of the present invention is a group order information inserting means for inserting order information for each wobble address signal data in unit of a predetermined data group in the encoding apparatus of the embodiment. The wobble signal modulation means further comprises modulating the wobble address signal data into which the bit order information and the group order information are inserted in a form that can be recorded on the optical recording medium.

The wobble address data decoding method of an optical recording medium according to an embodiment of the present invention is a method for demodulating signal processing a wobble signal read out from an optical recording medium on which wobble address signal data is recorded by the above-described encoding method. Step 1; Detecting bit order information for each bit data unit from the demodulated signal processed address data; And a third step of sorting and decoding the demodulated address data for each bit data unit by using the detected order information.

Further, the wobble address data decoding apparatus of an optical recording medium according to another embodiment of the present invention, in the decoding method of the embodiment, the group order for each predetermined data group unit in the demodulated signal data in the second step; The apparatus further detects information and aligns and decodes the demodulated address data using the detected bit order information and the group order information in the third step.

The wobble address data decoding apparatus of an optical recording medium according to an embodiment of the present invention comprises: demodulation signal processing means for demodulating signal processing of a wobble signal read out from an optical recording medium on which wobble address signal data is recorded; Order information detecting means for detecting bit order information of a bit data unit from the demodulated signal processed address data; And decoding means for aligning and decoding the demodulated address data in bit data units using the detected order information.

Further, the wobble address decoding apparatus of the optical recording medium according to another embodiment of the present invention, in the decoding apparatus of the embodiment described above, inserts the group order information for inserting the order information for each unit of the predetermined data group in the wobble address signal data The wobble signal modulating means may further include a means for modulating the wobble address signal data into which the bit order information and the group order information are inserted, in a form that can be recorded on the optical recording medium.

Hereinafter, an optical recording medium having a wobble address recorded therein, and a wobble address data encoding / decoding method and apparatus for the optical recording medium will be described in detail with reference to the accompanying drawings.

First, referring to FIG. 7, the spacing between the MSK marks included in the types of the ADIP unit is shown in the monotone unit. All 53 minimum wobble lengths (NWL) after the MSK mark recorded in the first three minimum wobble lengths (NWL) The monotone wobble is recorded in (), and in the data start reference unit, the monotone wobble is recorded at 15 minimum wobble lengths (NWL) immediately after the MSK mark recorded at the first three minimum wobble lengths (NWL). The sawtooth wobble " 0 " is recorded in 37 minimum wobble lengths NWL thereafter, and the monotone wobble is recorded in the next last minimum wobble length NWL.

The sync signal unit sync_0 unit has a monotone wobble at 13 minimum wobble lengths NWL immediately after the MSK mark recorded at the first three minimum wobble lengths NWL, and then three minimum wobble lengths NWL. At the MSK mark, followed by the seven minimum wobble lengths (NWL), followed by the monotone wobble, followed by the three minimum wobble lengths (NWL), followed by the MSK mark, followed by the 27 minimum wobble lengths (NWL). Are recorded in monotone wobble respectively. In addition, in the sync_1 unit, a monotone wobble is followed by 15 minimum wobble lengths NWL immediately after the MSK mark recorded in the first three minimum wobble lengths NWL, followed by three minimum wobble lengths NWL. At the MSK mark, followed by the seven minimum wobble lengths (NWL), followed by the monotone wobble, followed by the three minimum wobble lengths (NWL), followed by the MSK mark, followed by the 25 minimum wobble lengths (NWL). Are recorded in monotone wobble respectively. The sync signal unit sync_2 also has a monotone wobble at 17 minimum wobble lengths NWL immediately after the MSK mark recorded at the first three minimum wobble lengths NWL, and then three minimum wobble lengths NWL. At the MSK mark, followed by the seven minimum wobble lengths (NWL), followed by the monotone wobble, followed by the three minimum wobble lengths (NWL), followed by the MSK mark, followed by the 23 minimum wobble lengths (NWL). Are recorded in monotone wobble respectively. In the sync signal sync_3 unit, a monotone wobble is followed by 19 minimum wobble lengths NWL immediately after the MSK mark recorded in the first three minimum wobble lengths NWL, and then three minimum wobble lengths NWL. At the MSK mark, followed by the seven minimum wobble lengths (NWL), followed by the monotone wobble, followed by the three minimum wobble lengths (NWL), followed by the MSK mark, followed by the 21 minimum wobble lengths (NWL). Are recorded in monotone wobble respectively.

In addition, the data (sync_0) unit has a monotone wobble at 11 minimum wobble lengths (NWL) immediately after the MSK mark recorded at the first 3 minimum wobble lengths (NWL), and then at 3 minimum wobble lengths (NWL). The MSK mark is then followed by a monotone wobble at one minimum wobble length (NWL), followed by a sawtooth wobble "0" at the next 39 minimum wobble lengths (NWL), and the last one minimum wobble length (NWL). Are recorded in monotone wobble respectively. In addition, the data sync_1 unit has a monotone wobble at nine minimum wobble lengths NWL immediately after the MSK mark recorded at the first three minimum wobble lengths NWL, and then at three minimum wobble lengths NWL. The MSK mark is then followed by a monotone wobble at three minimum wobble lengths (NWL), followed by a sawtooth wobble "1" at 37 minimum wobble lengths (NWL), followed by the last one minimum wobble length (NWL). Are recorded in monotone wobble respectively.

First, an optical recording medium having a wobble address recorded therein according to the first embodiment of the present invention, and a wobble address data encoding / decoding method and apparatus for the optical recording medium will be described with reference to FIGS.

Referring to FIG. 8A, the 31 st to 42 th minimum wobble lengths of the data units data_0 and data_1 that do not collide with MSK marks by comparing the types of the ADIP units configured as shown in FIG. 12 minimum wobble lengths (NWL) belonging to NWL) are selected to divide these 12 NWLs into two groups (B0, B2), and NWLs contained in each NWL group (B0, B2) have the same wobble shape. At the same time, four pieces of information can be expressed by a combination of these wobbled patterns of the NWL group.

Referring to FIG. 8B, for example, the 25th to 48th examples of data units data_0 and data_1 that do not collide with MSK marks by comparing the types of ADIP units configured as shown in FIG. Select the 12 minimum wobble lengths (NWL) belonging to the first minimum wobble length (NWL) and divide the 12 NWLs into two groups (B0, B2) (that is, the 25th to 30th minimum wobble lengths ( NWL) (B0) and the 43rd to 48th minimum wobble lengths (NWL) B1], and the NWLs included in the respective NWL groups B0 and B2 are expressed in the same wobble shape and simultaneously Four pieces of information can be expressed by a combination of groups of wobble patterns.

8A and 8B illustrate an example in which six minimum wobble lengths form one NWL group, the present invention is not limited thereto, but the NWL group is defined by at least one minimum wobble length. In addition, the area to which the two groups belong is not necessarily included in the 25th to 48th minimum wobble lengths (NWL). In addition, in the present embodiment, one bit is represented by six NWLs in consideration of the possibility of missing during playback, and the larger the number of NWLs representing one bit, the higher the reliability of the decoder. As the number of NWL counts and pattern detections must increase, the load can also increase.

In Figs. 8A and 8B, in which four pieces of information are represented in the data unit by the above-described method, the NWL groups B0 and B2 are divided into a monotone wobble pattern and a sawtooth wobble pattern (sawtooth wobble "1" and sawtooth wave). Four pieces of information are represented by a combination of at least one of wobble " 0 ". That is, for example, four pieces of information can be expressed as shown in the table of FIG. 9.

As another embodiment of expressing four pieces of information in a data unit, four pieces of information can be expressed by a combination of a sawtooth wobble "1" pattern and a sawtooth wobble "0" pattern. That is, for example, four pieces of information can be expressed as shown in the table of FIG. 10.

The above four pieces of information can be used to express the order (or number) of data units included in the same nibble. Using this information, the number of data units belonging to the same nibble for one ADIP word as shown in FIG. (That is, order information of data units) can be specified.

In this way, in order to include the order (or number) information in the data unit, an address data encoding apparatus of the optical recording medium shown in Fig. 13 may be used. That is, when wobble address signal data represented by the wobble shape of the groove to be recorded on the optical recording medium on which the wobble shape groove is formed and recorded is generated and inputted, the data bit number (data bit order information) processing unit 10 is shown in FIG. According to the method of (A) or (B) of 8, data bit numbers (data bit order information) of a pattern such as, for example, FIG. 9 or 10 are added to the data unit. Thereafter, the MSK wobble modulation processing unit 20 modulates the wobble address data to which the data bit number is added as described above using the MSK method, and the signal recording unit 30 can record the modulated MSK wobble modulation signal as an optical recording medium. An optical disc (for example, DVD-RW, next generation high density optical disc) 40 is recorded.

Next, the demodulation and decoding scheme according to the first embodiment of the present invention will be described with reference to FIGS. 12 and 14.

Referring to FIG. 14, the wobble signal read by the wobble signal reading unit 50 is demodulated by the MSK wobble demodulation processing unit 60, and the data bit number (data bit order information) detection unit 70 performs the demodulated signal on the demodulated signal. The data bit order information included in each data unit is detected. Here, for example, when the data unit data_11 of ADIP unit No. 16 in the ADIP word structure of FIG. 11 is missed due to physical damage of the optical recording medium 40 or the like during reproduction of the optical recording medium, the data bit number The detector 70 detects the data bit numbers of the data unit data_12 and the data unit data_10 and transmits the data bit numbers to the wobble signal decoder 80. Then, the wobble signal decoder 80 recognizes that one data unit has been missed between the data unit data_12 and the data unit data_10. For example, as shown in FIG. Padding of 0 "or" 1 "minimizes the decoding error bit (one bit in this example), and the recovery of the decoding error nibble is passed to the share of the error correction (ECC) block. Error bits are such that they can be corrected by an error correction (ECC) block.

As described above, in the wobble addressing method using the MSK modulation method, when data bit number information (data order information) is inserted into a data unit as shown in FIG. 8, when the data units are missed when the optical recording medium is reproduced. The occurrence of error data bits can be minimized. Therefore, the occurrence of such a small decoding error block can be corrected by an error correction (ECC) decoding block, and it is possible to perform faster and more stable decoding of the error correction decoding block.

Next, an optical recording medium having a wobble address recorded therein according to a second embodiment of the present invention, and a wobble address data encoding / decoding method and apparatus of the optical recording medium will be described with reference to FIGS.

In this embodiment, a data bit number (i.e., data bit order information) is inserted and recorded in the data unit in the above-described first embodiment, and a nibble number (i.e., data is included in the data start instruction information unit). Group order information).

Referring to FIG. 15, the types of ADIP units configured as shown in FIG. 7 are compared to the 25th to 48th minimum wobble lengths (NWL) of the data start reference unit that do not collide with MSK marks. The 24 minimum wobble lengths (NWL) belonging to each other are selected to divide the 24 NWLs into four groups (B0 to B3), and the wobble shape of the minimum wobble length (NWL) included in each of the NWL groups (B0 to B3). The same information can be expressed and at the same time, 15 pieces of information can be expressed by a combination of these wobbled patterns of the NWL group. Here, sixteen pieces of information can be represented by the NWL groups B0 to B3. However, if all of the NWL groups B0 to B3 are expressed in a monotone wobble pattern, this is the same as the monotone unit, so that all of the NWL groups B0 to B3 are monotone. It should not be expressed in a wobble pattern.

Here, although FIG. 15 illustrates an example in which six minimum wobble lengths form one NWL group, the present invention is not limited thereto, and the NWL group may be formed by at least one minimum wobble length. The region to which the four groups belong is not necessarily included in the 25th to 48th minimum wobble lengths (NWL). In addition, in the present embodiment, one bit is represented by six NWLs in consideration of the possibility of missing during playback, and the larger the number of NWLs representing one bit, the higher the reliability of the decoder. As the number of NWL counts and pattern detections must increase, the load can also increase.

In FIG. 15A, which is an example of expressing 15 pieces of information in a data start reference unit by such a method, the NWL groups B0 to B3 are represented by a monotone wobble pattern and a sawtooth wobble pattern (sawtooth wobble "1"). And 15 pieces of information by expressing at least one of the sawtooth wobble " 0 "). That is, for example, 15 pieces of information can be expressed as shown in the table of FIG.

Also, in FIG. 15B, which is a second embodiment expressing fifteen pieces of information in a data start reference unit, fifteen pieces of information are represented by a combination of a sawtooth wobble "1" pattern and a sawtooth wobble "0" pattern. It is. That is, 15 pieces of information can be expressed as shown in the table of FIG.

The order of data start reference information units (i.e., number of nibble data or data group order information) can be expressed using the above fifteen pieces of information, and the order of data units using the first embodiment described above. Since the number of the bit data can be expressed, using them, the nibble number (i.e., data group order information) of the data unit and the bit number (i.e., data) of the data unit for one ADIP word as shown in FIG. Bit order information) can be specified.

In this way, in order to include nibble order (or number) information and data bit order (or number) information in the data start reference unit and the data unit, the address data encoding apparatus of the optical recording medium shown in FIG. 20 is used. Just do it. That is, when the wobble address signal data represented by the wobble shape of the groove to be recorded on the optical recording medium on which the wobble shape groove is formed and recorded is generated and input, the data bit number (data bit order information) processing unit 10 is shown in FIG. According to the method of (A) or (B) of 8, a nibble number (data group order information) of a pattern, for example, as shown in FIG. 9 or 10 is added to the data unit, and a nibble number (data group order information) processing unit ( 15) adds a nibble number (data group order information) of a pattern, for example, as shown in FIG. 16 or 17, to the data start reference unit according to the scheme of FIG. 15A or 15B. Thereafter, the MSK wobble modulation processing unit 20 modulates the wobble address signal data to which the data bit number (data bit order information) and nibble number (data group order information) are added as described above using the MSK method, and the signal recording unit 30 ) Records the modulated MSK wobble modulated signal on an optical disc (for example, DVD-RW, next generation high density optical disc) 40 which can be recorded as an optical recording medium.

Next, a demodulation and decoding scheme according to a first embodiment of the present invention according to the present invention will be described with reference to FIGS. 18 to 23.

Referring to FIG. 21, the wobble signal read out from the wobble signal reading unit 50 is demodulated by the MSK wobble demodulation processing unit 60 and data is transmitted by the nibble number (data group order information) detection unit 65 to the demodulated signal. The nibble (data group) order information included in the start reference unit is detected. Here, for example, in the ADIP word structure of FIG. 18, the data unit data_11 of ADIP unit number 16 and the data start instruction information unit reference 2 of ADIP unit number 18 are used to reproduce the optical recording medium 40 when the optical recording medium is reproduced. When missing due to physical damage or the like, the nibble number detection unit 65 does not have a data start instruction information unit (reference 2) after the data start instruction information unit (reference 1), and the data start instruction information unit (reference 3). (Not shown) and transmit the detected signal to the wobble signal decoder 80. At the same time, the data bit number detection unit 70 sequentially detects the data bit numbers included in the data units and notifies the wobble signal decoder 80 of the detection result. In the example of FIG. 19, the data bit number detection unit 70 is next to the data unit data_12. The data unit data_10 is detected and the detection result is transmitted to the wobble signal decoder 80.

Then, the wobble signal decoder 80 recognizes that the data start instruction information unit (reference 2) has been missed between the data start instruction information unit (reference 1) and the data start instruction information unit (reference 3), and the data start instruction information unit ( A reference 2) is generated and inserted into ADIP unit number 18 of FIG. 18, and also recognized that the data unit data_11 is missing between the data unit data_12 and the data unit data_10, and corresponds to the position of the ADIP of FIG. Padding unit number 16 to "0" or "1" minimizes the decoding error bits (one data bit in this example), and the recovery of the decoding error nibble is the share of the error correction (ECC) block. The decoding error bit is passed to the extent that it can be corrected by an error correction (ECC) block.

On the other hand, when the sewing machine is severe, for example, in the ADIP word structure of FIG. 18, the data unit data_01 and data_00 of ADIP unit numbers 10-11, the data start instruction information unit 1 of ADIP unit number 13, and ADIP unit number 14 When the data units (data_13, data_12) of ˜15 are missed at the time of reproduction of the optical recording medium, according to the conventional method, all decoders start the data after the missed ADIP unit in the decoder block as shown in FIG. The information unit and the data unit are shifted by at least one data group (i.e., one nibble data) unit, resulting in many decoding error nibbles, and recovery of the decoding error nibbles is not possible by an error correction (ECC) block. Done.

However, as described above, in the ADIP word structure of FIG. 18, the data units data_01 and data_00 of ADIP unit numbers 10-11, the data start instruction information unit reference 1 of ADIP unit number 13, and the data of ADIP unit numbers 14-15. Applying the second embodiment of the present invention when the units data_13 and data_12 have been missed at the time of reproduction of the optical recording medium, only the ADIP unit numbers 11, 12, 14 and 15 as shown in FIG. Decoding error bits are generated, and the occurrence of such a small number of decoding error bits is correctable by an error correction (ECC) decoding block and enables faster and more stable decoding of the error correction decoding block.

On the other hand, the present invention is not limited to the above-described typical preferred embodiments, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions are common in the art Those who have knowledge will easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, according to the first embodiment of the present invention, by inserting data bit number information (data bit order information) into a data unit, it is possible to prevent a fatal error due to missing during reproduction of the optical recording medium. The advantage of knowing the position of the decoded data bits immediately is that faster corrections can be made during error correction (ECC) decoding, thereby increasing system stability.

Further, according to the second embodiment of the present invention, an optical recording medium is provided by inserting data bit number information (data bit order information) into a data unit and data group number information (nibble data order information) into a data start instruction information unit. It is possible to more completely prevent the fatal error due to the sewing machine during playback, and to make the correction of the error correction (ECC) faster and more accurate since it has the advantage of knowing the position of the currently decoded data bit more accurately and immediately. This makes the system more stable.

Claims (46)

A recordable optical recording medium having a wobble groove formed thereon, And recording bit order information for each data bit unit in address data represented by the wobble shape of the groove. The method of claim 1, And a wobble address in which group order information is further included and recorded for each unit of predetermined data in the address data. The method according to claim 1 or 2, And the bit order information is included in a bit data unit of the address data. The method of claim 3, wherein And the group order information is included in a data start instruction information unit for dividing a predetermined data group unit of the address data. The method of claim 3, wherein And the bit order information is recorded in a specific portion of an area excluding the area required for the start mark of the unit constituting the data unit. The method of claim 4, wherein And the group order information is recorded in a specific portion of an area except for the area required for the start mark of the unit constituting the data start instruction information unit. The method of claim 5, And the bit order information is represented and recorded by a combination of the specific part divided into two and the wobble shape pattern of the two divided parts. The method of claim 6, 4. The optical recording medium having a wobble address recorded thereon, wherein the specific sequence is divided into four and the group order information is represented and recorded by a combination of the wobble shape patterns of the four divided portions. The method of claim 7, wherein And the bit order information is represented and recorded by a combination of a sine wave shape pattern and a sawtooth wave shape pattern. The method of claim 8, And the group order information is represented and recorded by a combination of a sine wave shape pattern and a sawtooth wave shape pattern. The method of claim 7, wherein And the bit order information is represented and recorded by a combination of a sawtooth wave pattern of a first phase and a sawtooth wave pattern of a phase different from the first phase. The method of claim 8, And the group order information is represented and recorded by a combination of a sawtooth wave pattern of a first phase and a sawtooth wave pattern of a phase different from the first phase. A first step of generating wobble address signal data represented by the wobble shape of the groove to be recorded on the optical recording medium on which the wobble shape groove is formed and recorded; Inserting bit order information for each data bit unit into the wobble address signal data; And a third step of modulating the wobble address signal data into which the bit order information is inserted into a form that can be recorded on the optical recording medium. The method of claim 13, In the second step, group order information is additionally inserted into the wobble address signal data for each unit of predetermined data group. And the third step modulates the wobble address signal data into which the bit order information and the group order information are inserted in a form that can be recorded on the optical recording medium. The method according to claim 13 or 14, And the second step inserts the bit order information into a bit data unit of the wobble address signal data. The method of claim 14, And the second step inserts the sequence information into a data start instruction information unit for dividing a predetermined data group unit of the wobble address signal data. The method of claim 15, And the second step inserts the bit order information into a specific portion of the area excluding the area required for the start mark of the unit constituting the data unit. The method of claim 16, And the second step inserts the sequence information into a specific portion of an area excluding the area required for the start mark of the unit constituting the data start instruction information unit. The method of claim 17, And the second step divides the specific part into two and expresses the bit order information by a combination of wobble shape patterns of the two divided parts. The method of claim 18, And the second step divides the specific part into four parts and expresses the group order information by a combination of the wobble shape patterns of the four parted parts. The method of claim 19, And the second step represents the bit order information by a combination of a sine wave shape and a sawtooth wave shape. The method of claim 20, And the second step represents the group order information by a combination of a sinusoidal shape and a sawtooth wave shape. The method of claim 21, And the second step represents the bit order information by a combination of a sawtooth wave shape in a first phase and a sawtooth wave shape in a phase different from the first phase. The method of claim 22, And wherein said second step represents said group order information by a combination of a sawtooth wave shape of a first phase and a sawtooth wave shape of a phase different from said first phase. The method according to any one of claims 14 to 24, The fixed data group unit is a nibble unit, characterized in that the wobble address data encoding method of the optical recording medium. Address signal generating means for generating address signal data represented by the wobble shape of the groove to be recorded on an optical recording medium on which a wobble shape groove is formed and recorded; Bit order information inserting means for inserting bit order information per data bit unit into the wobble address signal data; And wobble signal modulation means for modulating the wobble address signal data into which the bit order information is inserted into a form capable of recording the wobble address signal data on the optical recording medium. The method of claim 26. And group order information inserting means for inserting order information into the wobble address signal data for each unit of predetermined data group. And the wobble signal modulating means modulates the wobble address signal data into which the bit order information and the group order information are inserted into the optical recording medium. The method of claim 26 or 27, And the bit order information inserting means inserts the bit order information into a bit data unit of the wobble address signal data. The method of claim 27, And the group order information inserting means inserts the group order information into a data start instruction information unit for partitioning a predetermined data group unit of the wobble address signal data. The method of claim 28, And the bit order information inserting means inserts the bit order information into a specific portion of an area excluding the area required for the start mark of the unit constituting the data unit. The method of claim 29, The group order information inserting means inserts the group order information into a specific portion of an area excluding the area required for the start mark of the unit constituting the data start instruction information unit. Device. The method of claim 30, And the bit order information inserting means divides the specific part into two parts and expresses and inserts the bit order information by a combination of wobble shape patterns of the divided part. The method of claim 31, wherein And the group order information inserting means divides the specific part into four parts and expresses and inserts the group order information by a combination of the wobble shape patterns of the four part parts. The method of claim 32, And the bit order information inserting means expresses and inserts the bit order information by a combination of a sine wave shape pattern and a sawtooth wave shape pattern. The method of claim 33, And said group order information inserting means expresses and inserts said group order information by a combination of a sinusoidal pattern and a sawtooth wave-shaped pattern. The method of claim 34, The bit order information inserting means expresses and inserts the bit order information using a sawtooth wave pattern of a first phase and a sawtooth wave pattern of a phase different from the first phase. Device. The method of claim 35, wherein The group order information inserting means expresses and inserts the group order information by a sawtooth wave pattern of a first phase and a sawtooth wave pattern of a phase different from the first phase. Device. The method according to any one of claims 27 to 37, And the group order information inserting means inserts group order information for each nibble unit into the wobble address signal data. A first step of demodulating signal processing a wobble signal read out from an optical recording medium on which wobble address signal data is recorded by the encoding method defined in any one of claims 13 to 24; Detecting bit order information for each data bit unit in the demodulated signal processed address data; And arranging and decoding the demodulated address data by using the detected bit order information. The method of claim 39, The second step further detects the group order information for each unit of a predetermined data group in the demodulated signal processed address data, And the third step is to align and decode the demodulated address data using the detected bit order information and the group order information. The method of claim 39 or 40, And wherein the second step detects the bit order information in a data unit of the wobble address signal data. The method of claim 40, And wherein said second step detects said group order information in a data start instruction information unit for dividing a predetermined data group unit of said wobble address signal data. Demodulation signal processing means for performing demodulation signal processing on a wobble signal read out from an optical recording medium on which wobble address signal data is recorded; Bit order information detecting means for detecting bit order information in units of data bits in the demodulated signal processed address data; And decoding means for aligning and decoding the demodulated address data by using the detected bit order information. The method of claim 43, Group order information detecting means for detecting order information of a predetermined data group unit from the demodulated signal processed address data, And the decoding means aligns and decodes the demodulated address data using the detected bit order information and group order information. The method of claim 43 or 44, And the detecting means detects the bit order information in a data unit for the wobble address signal data. The method of claim 44, And the detecting means detects the group order information in a data start instruction information unit for dividing a predetermined data group unit for the wobble address signal data.