JPH0737335A - Sector signal forming method, recording device and reproducing device - Google Patents

Abstract

PURPOSE:To constitute a sector signal without erroneous propagation by matching the length of a byte in the longitudinal direction including the error correcting parities for correcting errors in the segment length and in the sector in an optical disk of a sample servo method, and suppressing redundancy. CONSTITUTION:User data and control information data are inputted through an input terminal 51, selected by a selector 52 and stored in a buffer memory 53. The data are also inputted into an error-detection coding means 54 in parallel, and the error detecting parity is generated. The parity is stored into the buffer memory 53. For the data in the memory 53, one-dimensional or two-dimensional error correcting parity is operated in an error-correction coding means 55 and stored into the memory 53. In a code-length control means 56, whether the error controlled based on the instruction from a system control means 57. The data, to which the parity is added, are read out of the memory 53 and recorded into a recording medium 62 with a recording means 61 through a digital modulating means 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, and more particularly to a so-called sample servo in which the rotation control of the disc and the tracking control of the signal track are performed based on dedicated information (pits) discretely recorded on the optical disc. The present invention relates to a method of forming a sector sector signal, and a recording device and a reproducing device based on the method.

[0002]

2. Description of the Related Art Conventionally, a data file using a rewritable optical disk having a diameter of 5.25 inches or 3.5 inches and a CD-R using a compact disk having a diameter of 12 cm.
In OM and the like, management such as data search, reproduction, and rewriting is performed in units called sectors. Moreover, the capacity of the data that makes up this sector, the data layout,
The structure is the same over the entire surface of the disk. In this case, the code error of the data is generally executed in units of this sector. One that performs error correction in units of sectors is one-dimensional error correction that uses a code with a large inter-code distance, such as that used in 5.25-inch optical disks, and one that uses CD-ROM. It is known that a code having a relatively small inter-code distance as used is combined two-dimensionally like vertical / horizontal parity to perform error correction. A detailed description thereof will be omitted because both of them are already commercialized and publicly known, but a conventional example will be described below with reference to the drawings using a 5.25-inch optical disk as an example.

(FIG. 7) is an overall configuration diagram of a sector used in a magneto-optical disk having a diameter of 5.25 inches, and (FIG. 8) is a data layout diagram relating to error correction of the data portion of (FIG. 7). Is.

In FIG. 7, 71 is a sector mark (SM), 72 is a VFO, and 73 is an address mark (A).
M), 74 is ID, 75 is CRC, 76 is GAP, 77
Is a data mark (DM), and 78 is a data part. Further, in (FIG. 8), 81 is a user data area and 82
Is an error correction parity area, 83 is an error detection parity area for user data, and 84 is a resynchronization signal area.

The sector mark 71 in FIG. 7 is used to search the beginning of a sector, and the VFO 72 uses a PLL (phase lock) for reading out the address mark 73, ID 74, specifically the track number and sector number. Loop) is used to pull in the clock. CRC (Cyclic Redundancy Check Code) 75 is ID data 7
4 used for error detection. These signals are pre-engraved on the disc as uneven signals. In the rewritable disc, the data section 78 is rewritten each time, but the writing timing of data may vary due to eccentricity of the disc, uneven rotation of the rotary motor, and the like. GAP76 is provided as a margin. The data mark 77 indicates the beginning of the data section 78.

FIG. 8 is a detailed explanatory diagram of the data part 78 of FIG. In FIG. 8, the user data area 8
In the case of 1, the data are sequentially arranged in the vertical direction from the upper left end. In the error correction parity area 82, error correction parity is calculated for each horizontal row of user data, and 16 bytes are added. This is done for every line. Here, a Reed-Solomon code that can be corrected byte by byte is adopted as an encoding method for error correction.
The error detection parity (CRC) area 83 is used to detect the presence or absence of an error after the error correction of the user data, because the Reed-Solomon code misses the error with a certain probability or corrects the error.

In the example shown in FIG. 8, the sector size is 1 Kbyte, and data interleaving is performed in units of 10 bytes. Also, if an error occurs during playback, the phase of the playback clock is shifted for some reason, or if the number of clocks differs from the original number, a bit shift occurs and the bit-to-byte conversion is not separated correctly. , The error propagates for a long time and may be regarded as an error more than the original error. In order to avoid this, resynchronization signals are inserted into the resynchronization signal (resync) area 84 at appropriate intervals in the middle of data so as to suppress an increase in redundancy as much as possible. This prevents the propagation of errors.

Next, the so-called sample servo system data format in which the rotation control of the disc and the tracking control of the signal track are performed based on the dedicated information (pits) discretely recorded on the optical disc will be described.

FIG. 9 is a sector structure diagram on a disk of the sample servo system. In FIG. 9, 91 is a disk, 92 is a sector, 93 is an outer servo zone, and 94.
Is an inner servo zone, 95 is a data zone, 96 is an outer segment, 97 is an inner segment, 98 is a track,
99 is a servo area.

In the sample servo system, the recording area is divided into a plurality of data zones 95 in the radial direction of the disk, and the data zones are further composed of a plurality of tracks 98. Each track 98 of each data zone is provided with a servo area 99 in which dedicated information (pits) for rotation control, tracking control, or a data punching clock is recorded. From one servo area to the next servo area. The physical length of has changed from zone to zone. The parts from one servo area to the next servo area are called segments 96 and 97. The sector 92 is composed of a plurality of segments, and the sector (FIG. 8) is recorded here.

[0011]

As described above, the prior art is as follows.
The data length of the sector is fixed, and therefore the length of the data section is also fixed. In a continuous servo type optical disc, it is not necessary to record information for rotation control on the optical disc, so that a constant angular velocity control (hereinafter referred to as CA
V control) or constant linear velocity control (hereinafter CLV)
There is no limit to the length of data in this sector in either of these methods. However, currently, most user data is 512 bytes.

In the sample servo system, the recording area is divided into a plurality of data zones in the radial direction of the disk,
Each track in that zone is provided with a servo area in which dedicated information (pits) for rotation control, tracking control, or data punching clock is recorded. Physical area from one servo area to the next servo area is provided. The segment length, which is the length, changes from zone to zone.

A sector is composed of a plurality of segments. Here, if the sector length is fixed, the segment length and the sector length do not match well in each zone. Therefore, in each zone, the integer ratio relationship between the interleave length and the segment length from the resynchronization signal, which is the unit of error correction, to the next resynchronization signal cannot be maintained. It is very likely that you will not be able to identify. This greatly impairs the error correction capability, and in some cases, it may not be possible to correct at all.

When the resynchronization signal used in the continuous servo method is inserted in the sample servo method to stop the error propagation, unlike the continuous servo method, the sample servo method is used for servo. It is necessary to provide a special pit, and the redundancy increases correspondingly, which is a value that cannot be ignored.

Further, since the number of bytes of the segment is different in each data zone and the servo area is always present at the head of the segment, the resynchronization signals must be generated irregularly, and therefore the resynchronization signal is generated. The detection of the sync signal becomes very complicated.

[0016]

SUMMARY OF THE INVENTION According to the present invention, the difference in segment length between zones in the above-mentioned sample servo system and the inconsistency in the logical length of the sector, and the inconsistency in the data structure for error correction due to the inconsistency. It was made in view of the problem.

According to the sector signal forming method of the present invention, one circumference of an optical disk is evenly divided into a plurality of area segments, and a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and further the disk area It is a sample servo system in which a data zone grouped for each of a plurality of tracks in the radial direction is provided, and a sector signal for each data zone is configured by the following procedure, and a byte unit is used as an error correction code, Predetermined E common to each data zone for N bytes of data
It is characterized by using a byte (E) parity. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) The circumference length l is divided by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) The number of segment bytes BSB in the servo area is subtracted from the number of segment bytes BSG to obtain the segment byte number M only in the data section, and this M is calculated in the vertical direction in the data arrangement of the sector data section having a two-dimensional vertical and horizontal data arrangement. The number of bytes in the (column) direction. (5) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (6) Let (the number of bytes N in the horizontal direction + the number of bytes of error correction parity E + the number of segments SID of the ID part of the sector SID) be the number of segments S that make up the sector.

In the recording apparatus of the present invention, one circumference of the optical disk is evenly divided into a plurality of area segments, and a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and the disk is further provided with a servo area. In a sample servo system in which a data zone grouped for each of a plurality of tracks in the radial direction is provided, a selector for selecting one of user data and management information, and an error detection code for the user data and management information during reproduction Means, a buffer memory for storing user data, management information, error detection parity, and error correction parity forming a data part of a sector, an error correction coding means for the data in the buffer memory, and the error correction coding Code length control means for controlling the code length encoded by the means, and system control Stage, user data length control means for controlling the effective user data length in the buffer memory, signal processing clock generation means for switching the signal processing clock according to an instruction from the system control means, and digital modulation for modulating the output of the buffer memory. And recording means for recording a signal on a recording medium based on the output of the digital modulating means.

Further, the reproducing apparatus of the present invention uniformly divides one circumference of the optical disk into a plurality of area segments, and provides a servo area in which a rotation control signal and a tracking control signal are recorded in the head area of the segment, and further, In a sample servo system in which data zones grouped in a radial direction for each of a plurality of tracks are provided, system control means, reproducing means for reproducing a signal from a recording medium, digital demodulating means for demodulating an output of the reproducing means, A buffer memory that stores the demodulated user data, management information, and error detection parity for detecting an error after error correction for the user data and management information, and error correction parity for the user data, management information, and error detection parity. User data stored in the buffer memory, management information, Error correction decoding means for performing error correction relating to error detection parity, code length control means for controlling the error correction code length of the error correction decoding means, and valid users in the buffer memory at the instruction of the system control means. User data length control means for controlling the data length, signal processing generation means for switching the signal processing clock in accordance with the instruction of the system control means, management information after error correction, and error detection decoding means for detecting an error in user data. It is characterized by being composed of.

[0020]

According to the present invention, by adopting the above-mentioned structure, the segment servo and the data structure for sector error correction are matched in the sample servo system, and the original correction capability of the error correction code is sufficiently obtained. It is possible to provide a sector signal forming method, a recording device, and a reproducing device that can be effectively used.

[0021]

EXAMPLES Specific examples of the present invention will be described in detail below.

First, the first embodiment will be described.
FIG. 1 is a diagram showing a data structure of a sector for error correction, which is called LDC (long distance code) by a one-dimensional error correction method. In FIG. 1, 11 is a user data area, 12 is an error correction parity area, and 13 is an error detection parity (CRC) area.

Further, (FIG. 2) is a calculation example of the segment length, the number of segments of the sector, the number of sectors of the track, the capacity of the data zone, etc. when the data structure of (FIG. 1) is applied to the sample servo system. .

In the optical disc, the recording capacity is determined by the shortest mark length (pit length) and the modulation method from the viewpoint of linear density. The areal density is added to the track density (track pitch). From the viewpoint of disk rotation control, the number of rotations and the frequency for rotation control are important. The number of servo areas to be provided on one track is determined by the number of rotations and the frequency for rotation control. In order to increase the recording capacity, the rotation speed is the same in each data zone of the disc, and the recording data rate is controlled so that the shortest mark length of each data zone is the same, and the recording in each data zone There are some data zones having the same data rate and different rotation speeds in each data zone in order to make the shortest mark length of each data zone the same. However, in the latter case, it is assumed that the rotation speed is constant within the same data zone. Therefore, from the viewpoint of rotation speed control, the number of servo areas in one round, that is, the number of segments is determined, and from this, the physical length of the segment length from the servo area to the next servo area is determined. From the viewpoint, the number of bits or bytes included in this segment length is determined. Therefore, the number of bytes included in the segment in each data zone differs.

FIG. 2 shows the data of the servo area of each segment, for example, wobble pits and clock pits are 2 bytes, and the data portion (management information, error detection parity, user data and error correction parity, etc.) excluding this data. ) Shows the example in which the byte length of only) is the number of bytes in the segment. # 1 to # 4 represent inner servo zones in (FIG. 9), and # 5 to # 13 are outer servo zones. # 1 to # 13 are respective data zones.
Clearly, each data zone has a different number of bytes in the segment. Here, the size of the user data in the predetermined data part, for example, 512 bytes or 1024
From the viewpoint of the size of bytes or 2048 bytes and the error correction capability, the number of error correction parities (the Reed-Solomon code in byte units is often used, and in this case, the number of parity = the number of bytes), that is, the number of bytes Is determined, and the data arrangement / configuration is determined from this user data and error correction parity.

FIG. 2 shows the case where the user data capacity is 2048 bytes, and E bytes of error correction parity are added to N bytes of user data. Here, ID data such as a track number and a sector number is made into two segments. In this case, in FIG. 1, the data is divided into N columns by M bytes in the vertical direction, that is, in the column direction during the error correction encoding, and E bytes of error correction parity are arithmetically added to each row. It Then each longitudinal,
That is, each column is transferred or recorded on the recording medium. By doing so, interleaving is performed and the correction capability is secured. In this case, the number of bytes that matches the number of bytes in a segment is the number of bytes M in one vertical column in (Fig. 1).
Is. The decision is made so that the number of bytes of the segment and the number of bytes M of the interleave have an integer relationship. Furthermore, the number of correction steps for error correction should be determined so that it does not change significantly, that is, N does not change significantly. This leads to suppression of variations in correction capability among data zones. The data configuration procedure is as follows. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) l divided by the number of segments Ns around the disk
Ask for. (3) Is is divided by the shortest mark length and the bit length determined by the modulation method to obtain the number of bits in the segment, and from this, the total segment byte number BSG is obtained. (4) The byte number BSB of the servo area is subtracted from BSG to obtain the byte number M of the data segment, and this is set as the byte number in the vertical (column) direction. (5) (Management information + user data + error detection parity)
The number N of segments is obtained by rounding up the number divided by M. (6) The number of segments S in the sector is obtained from N + the number of bytes of the error correction parity E + the number of segments SID of the ID section of the sector. (7) The number of sectors in the track Sn is determined by rounding down the decimal point of Ns ÷ S. (8) The number of bytes (capacity) of user data in each data zone is obtained from the number of bytes of user data × Sn × the number of tracks t in each data zone. (9) The number Sr of in-track residual segments is obtained from Ns-Sn * S. (10) The capacity of each disk is summed to obtain the capacity of the entire disk.

The above-mentioned residual segment is generated by making the head of a sector start in the same radial direction in all data zones in one round of the disk in FIG. 9 (for example, 12:00 of the clock). This is to facilitate the cueing of data and speed up access. As a matter of course, if there is no residue, the capacity can be increased accordingly.

Here, if the error correction error is overlooked and the error correction probability is low, the error detection parity may be omitted. Further, the management information may be omitted. In the above calculation example, 28 bytes of management information are calculated as part of the user data.

Next, a second embodiment will be described.
FIG. 3 shows an example of the data arrangement configuration of the data part of the sector in the second embodiment of the present invention. The second embodiment is one in which the error correction is two-dimensional, that is, performed on the product code.

In FIG. 3, 31 is a user data area, 32 is an error detection parity (CRC) area, 33 is an error correction parity C1 area, and 34 is an error correction parity C2.
Area. At the time of recording, N bytes of user data are arranged in each row in the horizontal direction from the upper left end, and a data arrangement of N rows and M columns is configured. The error correction parity is first added to each row by c2 bytes for N bytes of data. When the parity for M rows is added, then c1 bytes are added for M bytes of data for each column. A total of (N + c2) columns are added. Therefore, interleaving is performed for each M bytes of data and (M + c1) bytes when the correction parity is included. In this case, what matches the number of bytes in the segment (Fig. 3)
Is the number of bytes in one vertical column (M + c1). The data configuration procedure is as follows. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) l divided by the number of segments Ns around the disk
Ask for. (3) Is is divided by the shortest mark length and the bit length determined by the modulation method to obtain the number of bits in the segment, and from this, the total segment byte number BSG is obtained. (4) The byte number BSB of the servo area is subtracted from BSG to obtain the data segment byte number M ', and an integer multiple (n) of this M'is taken as the byte number L in the vertical (row) direction. Let M be the value obtained by subtracting the byte number c1 of the vertical error correction parity from L. (5) (Management information + user data + error detection parity)
The number N of segments is obtained by rounding up the number divided by M. (6) (N + number of horizontal error correction parity bytes c2) ×
The number S of segments in the sector is obtained from the number of segments SID in the ID portion of n + sector. (7) The number of sectors Sn in the track is obtained by rounding down the decimal point of Ns ÷ S. (8) The number of bytes (capacity) of user data is obtained from the number of bytes of user data × Sn × the number of tracks in each data zone. (9) The number Sr of in-track residual segments is obtained from Ns-Sn * S. (10) The capacity of each disk is summed to obtain the capacity of the entire disk.

An example calculated by the above procedure is shown in FIG. Also in this embodiment, it is naturally possible to effectively use the residual segment, and it is also possible to omit the management information in the sector and the error detection parity.

Next, a third embodiment will be described. In the first embodiment, the number of bytes of error correction parity is the same in each data zone and only the data length is different. However, in the third embodiment, the random error correction capability is almost the same in each data zone. The number E of correction parity bytes is adjusted so that

Since the target random correction capability is determined in advance and the number of bytes M of the segment is obtained for each data zone, the number of NN (NN = management information + user data + error detection parity) number / M below the decimal point The number of segments N rounded up is calculated, and the number of bytes E of error-correction parity that gives the target correction capability is added to this N-byte data in advance. Since the segment length changes when the data zone changes, N naturally changes, but the number E of correction parities for which the correction capability predetermined as a target is obtained is attached to this N-byte data. It is obvious that the number of bytes E of the correction parity can be calculated separately. Further, the calculation procedure for obtaining the signal component of the sector is the same as that of the first embodiment.

Next, a fourth embodiment will be described. In the second embodiment, the number of bytes of the error correction parities c1 and c2 is the same in each data zone and only the data length is different. However, since the random error correction capability is different, the fourth embodiment is different. Similarly to the third embodiment, the number of bytes of c1 is fixed and the number of bytes of c2 is adjusted so that the random error correction capability is almost the same in each data zone.

Since the number M of bytes of a segment is obtained for each data zone, the number N of segments (NN = management information + user data + error detection parity) / (M-c1) is rounded up to the nearest decimal point to calculate the segment number N. Then, the number of bytes c2 of the error correction parity for obtaining the target correction capability is added to the N-byte data in advance. Since the segment length changes when the data zone changes, N naturally changes, but the number of correction parities c2 that gives the correction capability predetermined as a target is attached to this N-byte data. It is obvious that the byte number c2 of this correction parity can be separately calculated. By the way, the calculation procedure for obtaining the signal components of the sector is the same as in the second embodiment. Here, the number of bytes L is set to be an integral multiple of the segment length.

Next, a fifth embodiment will be described. In the fourth embodiment, the number of bytes of c1 parity is fixed,
Although the number of bytes of c2 parity is adjusted and the random correction capability in each data zone is made uniform, in the fifth embodiment, by fixing the number of bytes of c2 parity and varying the number of parity of c1, The random correction capability is to be the same in every data zone.

To determine the number of bytes C1 of an appropriate C1 parity, the number of bytes of a segment M is obtained for each data zone. Therefore, NN (NN = management information + user data + error detection parity) number / (M -The number of segments N rounded up to the decimal point of c1) is calculated, the number of bytes of C2 parity c2 (fixed) is added to this N-byte data, the random error correction capability is calculated, and the predetermined random error correction capability is calculated. The number of bytes of C1 parity c1 is changed and the calculation is repeated until is obtained. Since the segment length changes when the data zone changes, N naturally changes, but the above calculation is executed each time. Here, the calculation procedure for obtaining the signal component of the sector is the same as that in the second embodiment. Also, the number of bytes L is set to be an integral multiple of the segment length, as in the fourth embodiment.

Next, a sixth embodiment will be described. In the fourth embodiment or the fifth embodiment relating to the product code, the number of bytes of error correction parity in the vertical direction c1 or the number of bytes of parity in the horizontal direction c2 is set in accordance with the number of bytes in each data zone segment. Only one of them is fixed, and the correction capability is adjusted with c2 if c1 is fixed and with c1 if c2 is fixed. In the sixth embodiment, the number of bytes of both c1 and c2 is adjusted. If the correction capability is adjusted only by the number of bytes of either one, the correction capability of random errors can be kept within a certain range, but it is impossible to align the burst errors with each data zone. . If both the numbers of bytes of c1 and c2 are changed for each data zone, the burst error correction lengths can be made uniform to some extent.
As a matter of course, since the number of bytes of the segment of each data zone is known in advance, it is possible to adjust both the random error correction ability and the burst error correction ability. Here, the calculation procedure for obtaining the signal component of the sector is the same as that in the second embodiment. The same applies when the number of bytes L is an integral multiple of the segment length.

Next, a seventh embodiment will be described. The length of the segment is different in each data zone, and if the data arrangement of the sector is performed by an integral multiple of the segment length, the user data capacity will be, for example, 512 bytes or 102 bytes.
If it is fixed to 4 bytes or 2048 bytes, data having no purpose of use other than management information and error detection parity (CRC) may be generated. The seventh embodiment intends to effectively use the unused bytes as user data.

In the seventh embodiment, data bytes other than the management information, user data and error / error detection parity generated in each sector are regarded as user data and are positively used. The number of bytes in the segment differs for each data zone, and a surplus byte is generated due to the data structure depending on it.This is because the start, end radius, and address of each data zone are known in advance, so that data is accessed. It is possible to know in advance the surplus bytes of the sector. Therefore, it does not matter at all that the user data capacity in sector units differs for each data zone. It is possible to write this user data capacity information in the TOC or management information area. This method can effectively use the surplus bytes and increase the capacity. When the recorded data is software such as karaoke or movie, the data capacity of the sector does not need to be constant.

Next, the eighth embodiment will be described. In the first to seventh embodiments, if the data arrangement configuration of the sectors of each data zone is predetermined,
There is no problem in processing at the time of recording or reproducing data according to the data arrangement configuration of the sector of each data zone. However, in the case of a rewritable optical disc, if these processes are allowed to be performed on a disc-by-disc basis, or even within a single disc, a plurality of sector configurations and error correction methods can be arbitrarily performed, the degree of freedom in processing increases. .

Therefore, in the eighth embodiment, these pieces of information, that is, whether the error correction is performed one-dimensionally or two-dimensionally, in the case of one-dimensional correction, the number of interleaved bytes M and the row direction of the data are set. The number of bytes N, the number of bytes for error correction E, the number of bytes of data in the vertical direction M in the case of two-dimensional correction, the number of bytes of data in the horizontal direction N, and the parity for error correction C1 and C2
The number of bytes c1 and c2, and the information such as the number of effective bytes of user data, which is common to both, is a part of the inner or outer circumference of the disc, that is, TOC (table of contents).
Describe in the area or the file management area at the beginning of each file.

Next, a ninth embodiment will be described. The ninth embodiment relates to a specific recording apparatus that realizes the methods described in the first to eighth embodiments, and its block diagram is shown in (FIG. 5).

In FIG. 5, 51 is an input terminal for user data, 52 is a selector, 53 is a buffer memory, 5
4 is error detection coding means, 55 is error correction coding means,
56 is a code length control means, 57 is a system control means, 58
Is a drive control means, 59 is a drive device, 60 is a digital modulation means, 61 is a recording means, 62 is a recording medium, 6
Reference numeral 3 is management information. The operation will be described based on FIG.

User data from the input terminal 51, or logical address data corresponding to a physical address from the system control means, file type, time code, sampling frequency, information on sector data structure (error correction method, number of user data bytes, The management information data such as the number of error parities in the vertical or horizontal method, the number of bytes of data in the vertical or horizontal direction, etc. is selected by the selector 52 and described in the buffer memory 53 in the first to eighth embodiments. It is stored so that the data arrangement of the selected sector is obtained. In parallel with this, the output data of the selector 52 is C
RC (Cyclic redundancy check code = CR
C) is input to the error detection coding means 54,
Error detection parity for the user data and the management information data is generated and stored in the buffer memory 53 after the management information and the user data.

The data in the buffer memory 53 is stored in the buffer memory 53 as the one-dimensional error correction parity E or the two-dimensional error correction parities C1 and C2 are calculated by the error correction coding means 55. Here, in the code length control means 56, whether the error correction method is one-dimensional or two-dimensional, each code length, the number of bytes of parity, etc. are controlled by an instruction from the system control means 57. Further, the drive control means 58 operates the drive device 59 in accordance with an instruction from the system control means 57, seeks to a target track, and controls the rotational speed of the disk.

The data to which the error detection parity and the error correction parity are added is read from the buffer memory 53,
Recording is performed on the recording medium 62 by the recording means 61 including an amplifier and an optical head by using the digital modulation means 60. Further, the system control means 57 determines whether the rotation of the disk is the same for the entire disk or changes for each data zone.
In response to this, the signal processing clock of the signal processing clock generating means 65 is switched accordingly. Further, when the capacity of the user data changes for each data zone, the user data length control means 64 operates according to an instruction from the system control means 57, and the buffer memory is written so that the user data is filled.

Next, a tenth embodiment will be described.
The tenth embodiment relates to a specific reproducing apparatus for realizing the method described in the first to eighth embodiments,
The block diagram is shown in FIG.

In FIG. 6, 66 is a recording medium, and 67.
Is a drive device, 68 is drive control means, 69 is system control means, 70 is reproduction means, 71 is digital demodulation means, 72 is buffer memory, 73 is error correction decoding means, 74 is code length control means, and 75 is error. Detecting / decoding means, 76 is an output data terminal, 77 is an error flag output terminal, 78 is a user data length control means, and 79 is a signal processing clock generation means. The operation will be described based on FIG.

Based on an instruction from the system control means 69, the drive control means 68 controls the number of rotations of the drive device 67, and the reproducing means constituted by an optical head and an amplifier for the target track address and sector number of the recording medium 66. 70
Is moved to read desired data from the recording medium 66. The read data is demodulated to the original data by the digital demodulation means 71 and stored in the buffer memory 72. The buffer memory 72 stores data in consideration of the data arrangement of sectors. Since the system control means 69 recognizes in advance which data zone has which sector data structure, the code length control means 74 controls the error correction decoding means 73 based on this.
Error correction is performed.

The user data after error correction is output from the user data output terminal 76. Error correction decoding means 73
Then, for example, when the Reed-Solomon code is used, an error is overlooked or erroneously corrected with a certain probability. Therefore, the error detection / decoding means 75 performs the error detection, and if there is an error, an error is output from the error flag output terminal 77. The flag is output. If the error correction method changes in units of data zones within one disc, the contents of the TOC area are written in advance, so the data of the once reproduced TOC area is stored in the buffer memory 72. After error correction, it is transferred to the system control means 69, and the system control means 69 stores it. Naturally, the sector structure of the TOC area must be determined in advance by one method. In this case, of course, the error flag is transferred to the system control means 69 and the error-free data is stored.

In addition, the system control means 69 determines whether the entire rotation speed of one disk from the drive control means 68 is the same,
Alternatively, information indicating whether the number of revolutions is different for each data zone is transferred, and the clock switching of the signal processing clock generating means 79 of the entire system is controlled based on the information. Further, the system control means 69 gives an instruction to the user data length control means 78 and outputs only the effective data length to the user data output terminal 76.

[0053]

As described above, according to the present invention, in a sample servo type optical disc, a segment which is a data recording area between a servo area in which information for rotation control and tracking control is recorded and a servo area is recorded. The length of
Even when the data zones divided in the radial direction are divided into a plurality of tracks, the sector data arrangement configuration,
By aligning the code length for error correction with the length of the segment, there is no error propagation even without the resynchronization signal as in the past, and the data arrangement configuration of the sector can exhibit the maximum correction capability of the correction code. And a recording device and a reproducing device based on the same.

[Brief description of drawings]

FIG. 1 is a data configuration diagram of a sector for error correction according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a calculation example of a data structure of a sector according to the first embodiment of the present invention.

FIG. 3 is a data configuration diagram of a sector for error correction according to the second embodiment of the present invention.

FIG. 4 is a diagram showing a calculation example of a data structure of a sector according to a second embodiment of the present invention.

FIG. 5 is a block diagram of an encoding device (recording device) according to first to eighth embodiments of the present invention.

FIG. 6 is a block diagram of a decoding device (playback device) according to first to eighth embodiments of the present invention.

FIG. 7 is an overall sector configuration diagram of a conventional 5.25-inch optical disc.

FIG. 8 is a detailed explanatory diagram of a data section 78 of (FIG. 7).

FIG. 9 is a sector configuration diagram on a disk of a sample servo system.

[Explanation of symbols]

 11, 31 User data area 12 Error correction parity area 13, 32 Error detection parity area 33 Error correction parity C1 area 34 Error correction parity C2 area 51 User data input terminal 52 Selector 53 Buffer memory 54, 72 Error detection coding means 55 Error correction coding means 56,74 Code length control means 57,69 System control means 58,68 Drive control means 59,67 Drive device 60 Digital modulation means 61 Recording means 62,66 Recording medium 63 Management information 64,78 User data length Control means 65, 79 Signal processing clock generating means 70 Reproducing means 71 Digital demodulating means 73 Error correction decoding means 75 Error detection decoding means 76 User data output terminal 77 Error flag output terminal

Claims (10)

[Claims] Claim: What is claimed is: 1. One circumference of an optical disk is evenly divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in a head area of the segment, and a plurality of tracks are provided in the radial direction of the disk. It is a sample servo system in which a data zone grouped in is provided, and sector signals for each data zone are configured by the following procedure, and error correction codes are byte-unit, and for N-byte data, A sector signal forming method characterized in that a predetermined E byte (E number) of parity is used in common for each data zone. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) The circumference length l is divided by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) The number of segment bytes BSB in the servo area is subtracted from the number of segment bytes BSG to obtain the segment byte number M only in the data section, and this M is calculated in the vertical direction in the data arrangement of the sector data section having a two-dimensional vertical and horizontal data arrangement. The number of bytes in the (column) direction. (5) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (6) Let (the number of bytes N in the horizontal direction + the number of bytes of error correction parity E + the number of segments SID of the ID part of the sector SID) be the number of segments S that make up the sector. 2. A circumference of an optical disk is evenly divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in a head area of the segment, and a plurality of tracks are arranged in a radial direction of the disk. This is a sample servo system in which a data zone grouped in is provided, and the sector signal for each data zone is configured by the following procedure, and the error correction code is a byte unit. For each data zone, the same c1 byte (c1) parity is used,
Further, a sector signal forming method is characterized in that for data of N bytes in the horizontal direction, a common c2 byte (c2) parity is used in each data zone. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) The circumference length l is divided by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) Number of segment bytes BSG minus the number of bytes in the servo area BSB, the number of segment bytes in the data section M '
And an integer multiple of M ′, nM ′ = L, is defined as the number of bytes in the vertical (column) direction in the data arrangement of the data part of the sector having a two-dimensional vertical and horizontal data arrangement. (5) M is obtained by subtracting the byte number c1 of the vertical error correction parity C1 of the sector from the L. (6) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (7) (number of bytes in the horizontal direction N + number of bytes of error correction parity C2 c2) × n + number of segments in the ID part of the sector S
Let ID) be the number of segments S that make up a sector. 3. A circle of an optical disk is evenly divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are arranged in the radial direction of the disk. This is a sample servo system in which a data zone grouped in is provided, the sector signal for each data zone is configured by the following procedure, and the error correction code is in byte units. The sector signal forming method is characterized in that the byte number E of the error correction parity is varied so that a target random correction capability can be obtained in advance even if the byte number N of the data of 1. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) The circumference length l is divided by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) The number of segment bytes BSB in the servo area is subtracted from the number of segment bytes BSG to obtain the segment byte number M only in the data section, and this M is calculated in the vertical direction in the data arrangement of the sector data section having a two-dimensional vertical and horizontal data arrangement. The number of bytes in the (column) direction. (5) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (6) Let (the number of bytes in the horizontal direction N + the number of bytes of the error correction parity E + the number of segments SID of the ID part of the sector SID) be the number of segments S forming the sector. 4. A circle of an optical disk is evenly divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are provided in the radial direction of the disk. This is a sample servo system in which a data zone grouped in is provided, and the sector signal for each data zone is configured by the following procedure, and the error correction code is a byte unit. For each data zone, the same c1 byte (c1) parity is used,
Further, even if the number of bytes of data in the vertical direction and the number of bytes of data in the horizontal direction change for each data zone, the target random correction capability can be obtained in advance by using c2 bytes (c2 bytes) of the error correction code. Sector signal forming method characterized by varying the number of parity of the sector signal. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) The circumference length l is divided by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) Number of segment bytes BSG minus the number of bytes in the servo area BSB, the number of segment bytes in the data section M '
And an integer multiple of M ′, nM ′ = L, is defined as the number of bytes in the vertical (column) direction in the data arrangement of the data part of the sector having a two-dimensional vertical and horizontal data arrangement. (5) M is obtained by subtracting the byte number c1 of the vertical error correction parity C1 of the sector from the L. (6) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (7) (number of bytes in the horizontal direction N + number of bytes of error correction parity C2 c2) × n + number of segments in the ID part of the sector S
Let ID) be the number of segments S that make up a sector. 5. A circle of an optical disk is evenly divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are arranged in the radial direction of the disk. This is a sample servo system in which the data zones grouped in are provided, and the sector signal for each data zone is configured by the following procedure, and the number of bytes of data in the vertical direction changes in each data zone. Even if the number of bytes of the data changes, the error correction code uses a byte unit so that the target random correction capability can be obtained in advance, and an error of c2 bytes for N bytes of data in the horizontal direction. With the correction parity fixed, the error parity of c1 bytes (c1) for M bytes of data in the vertical direction is calculated. Sector signal forming method characterized by varying. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) The circumference length l is divided by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) Number of segment bytes BSG minus the number of bytes in the servo area BSB, the number of segment bytes in the data section M '
And an integer multiple of M ′, nM ′ = L, is defined as the number of bytes in the vertical (column) direction in the data arrangement of the data part of the sector having a two-dimensional vertical and horizontal data arrangement. (5) M is obtained by subtracting the byte number c1 of the vertical error correction parity C1 of the sector from the L. (6) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (7) (number of bytes in the horizontal direction N + number of bytes of error correction parity C2 c2) × n + number of segments in the ID part of the sector S
Let ID) be the number of segments S that make up a sector. 6. A single circumference of an optical disk is divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are provided in the radial direction of the disk. It is a sample servo system in which the data zones grouped in are provided, and the sector signal for each data zone is constructed by the following procedure so that both the target random correction capability and the burst correction capability are satisfied in advance. The error correction code is in units of bytes. For vertical M bytes of data, c1 bytes (c1) of error correction parities are used, and for horizontal N bytes of data, c2 bytes ( c2) error correction parity
A sector signal forming method characterized by varying both bytes. (1) Obtain the circumference length l at the innermost circumference of each data zone. (2) Divide the circumference length l by the number of segments Ns around the disk to obtain the segment length ls. (3) The segment length ls is divided by the shortest mark length and the bit length converted from the digital modulation method to obtain the number of bits in the segment, which is converted into the number of bytes in 8-bit units, and this is converted into the total number of segments. The number of bytes is BSG. (4) Number of segment bytes BSG minus the number of bytes in the servo area BSB, the number of segment bytes in the data section M '
And an integer multiple of M ′, nM ′ = L, is defined as the number of bytes in the vertical (column) direction in the data arrangement of the data part of the sector having a two-dimensional vertical and horizontal data arrangement. (5) M is obtained by subtracting the byte number c1 of the vertical error correction parity C1 of the sector from the L. (6) (Management information + user data + error detection parity)
Is divided by the above M to obtain a number N rounded up to the right of the decimal point, which is taken as the number of bytes in the horizontal (row) direction in the data arrangement of the data portion of the sector. (7) (number of bytes in the horizontal direction N + number of bytes of error correction parity C2 c2) × n + number of segments in the ID part of the sector S
Let ID) be the number of segments S that make up a sector. 7. A single circumference of an optical disk is divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are arranged in the radial direction of the disk. Number of bytes of the data area excluding the servo area in the segment length from the servo area to the next servo area when the error correction is performed one-dimensionally in the sample servo method with the data zone grouped in 2 vertical and horizontal
Match the number of bytes in the vertical data of the sectors where data is arranged dimensionally, and satisfy the total number of bytes of user data, management information, and error detection parity that require the minimum number of data bytes in the horizontal direction. If the error correction is performed two-dimensionally, the number of bytes of the data in the vertical direction and the error in the vertical direction in the two-dimensional data arrangement of the sector are added to the number of bytes of the data area excluding the servo area of the above segment length. The number of bytes of corrected parity is added together, and the number of bytes of horizontal data is determined so as to satisfy the total required number of bytes of user data, management information, and error detection parity. A sector signal forming method using bytes as user data. 8. An optical disk is divided into a plurality of area segments evenly, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are arranged in the radial direction of the disk. In the sample servo system in which the data zones grouped in are provided, the error correction method of the data part of the sector in which the data is arranged in two dimensions vertically and horizontally is one-dimensional or two-dimensional. The number of bytes of data in the vertical direction, the number of bytes of data in the horizontal direction, the number of bytes of error correction parity, the number of bytes of data in the vertical direction in the case of two-dimensional correction,
Record the number of horizontal data bytes, the number of vertical error correction parity bytes, the number of horizontal error correction parity bytes, and the number of user data bytes in some TOC areas such as the inner or outer circumference of the disk. And a sector signal forming method. 9. A single circumference of an optical disk is divided into a plurality of area segments, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are arranged in the radial direction of the disk. In a sample servo system having a data zone grouped in, a selector for selecting one of user data and management information, error detection coding means for these user data and management information at the time of reproduction, and sector data A buffer memory that stores user data, management information, error detection parity, and error correction parity that form a unit, error correction coding means for the data in the buffer memory, and a code coded by the error correction coding means Code length control means for controlling the length, system control means, and the buffer memory , A user data length control means for controlling the effective user data length, a signal processing clock generation means for switching a signal processing clock according to an instruction from the system control means, a digital modulation means for modulating the output of the buffer memory, and the digital modulation. A recording device configured to record a signal on a recording medium based on an output of the recording device. 10. An optical disk is divided into a plurality of area segments evenly, a servo area in which a rotation control signal and a tracking control signal are recorded is provided in the head area of the segment, and a plurality of tracks are provided in the radial direction of the disk. In the sample servo system in which the data zones grouped in the above are provided, a system control means, a reproducing means for reproducing a signal from a recording medium, a digital demodulating means for demodulating an output of the reproducing means, the demodulated user data, An error detection parity for detecting an error after error correction for the management information, the user data, and the management information, a buffer memory for storing the error correction parity for the user data, the management information, and the error detection parity; and a buffer memory stored in the buffer memory. User data, management information, error detection parity Error correction decoding means for performing error correction, code length control means for controlling the error correction code length of the error correction decoding means, and effective user data length in the buffer memory controlled by the system control means User data length control means, signal processing generation means for switching the signal processing clock according to the instruction of the system control means, management information after error correction, and error detection decoding means for detecting an error in user data. A playback device characterized by the above.