JP2003077227A - Recording medium, device and method for disk recording, and device and method for disk reproduction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize high reliability when ID information is reproduced by making it possible to correct a channel bit or word even if a defect is caused. SOLUTION: In a burst cutting area inside a data area where contents data of an optical disk are recorded, ID information unique to the disk is recorded. The burst cutting area is equally divided into (n) to form (n) blocks. Each block is further sectioned into (m) frames. Then each frame is divided into (k) and the ID information is recorded with (k) channel bits. In each block, disk ID information in ECC format constituted by adding of 12-byte parity to 16-byte disk ID information is recorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, a disc recording apparatus and method, and a disc reproducing apparatus and method, and more particularly, to a recording medium and a disc capable of reliably reproducing disc ID information. The present invention relates to a recording device and method, and a disc reproducing device and method.

[0002]

2. Description of the Related Art With the spread of write-once or rewritable discs, data that is originally prohibited to be copied (for example, content data such as music data and video data protected by copyright etc.) It may be copied illegally. For example, DVD (Digital Versatile Di
In sk), a BCA (Burst Cutting Area) is provided in order to prevent illegal copying between disks.

Referring to FIG. 1, BC provided in DVD
A will be described. DVD1 (DVD-ROM (Read
Only Memory) or DVD-RAM (Random Acc
essMemory)) BCA2 is shipped with YAG
By irradiating a pulsed laser beam of a (yttrium / aluminum / garnet) laser, a strip (bar code) in which the reflective film made of aluminum or the like formed inside the disk is removed in a slender shape in the radial direction, It is formed along the innermost circumference according to the record information such as the identification information such as and the encryption key. This BCA2
Are formed over about 330 ° along the innermost circumference of the DVD 1.

The data structure of the data recorded in the BCA2 is shown in FIG.

In the data recorded in the BCA2, a row of 5 bytes is set as one unit, and the leading 1 byte is a sync byte (SB) or a resync (RS). BCA-Preamble is recorded in 4 bytes of the first line. The BCA-Preamble is data of all 0s. In the BCA data field, 4 bytes in each row are the information area or EDC (error det).
section code (error detection code)). ECC
In the (Error correction code) area, 4 bytes of each row are used as an error correction code. In the last line, BCA-Po
The stamble is recorded.

When reproducing the data recorded in the BCA2, in the reproducing apparatus, a clock is generated by a PLL (Phase Locked Loop) based on the reproduction signal of the BCA-Preamble portion, and a predetermined method is based on the clock. Then, demodulation and error correction are performed, and data is reproduced.

[0007]

However, if the size of the missing data exceeds the error correction capability (that is, if there is a large local defect), the data cannot be reproduced. The information recorded in the BCA2 is ID information peculiar to the disc, etc., and may be involved in all the data in the disc (for example, determining whether or not the content recorded in the DVD1 may be reproduced). Therefore, high reliability is required for recording and reproducing data.

The present invention has been made in view of such a situation, and it is possible to correct the channel bit or the word even if a defect occurs on the disc, and it is high in reproducing the ID information. It makes it possible to achieve reliability.

[0009]

According to a first recording medium of the present invention, a second area other than the first area for recording content data is arranged, and the second area has a parity of 12 bytes or more. It is characterized in that its own ID information to which is added is placed.

In the second area, n blocks each having a length obtained by equally dividing the second area into n in the circumferential direction are arranged,
ID information in which a parity of 12 bytes or more is added to each of the n blocks can be arranged.

It is possible to multiple-write ID information of three or more.

The first disc recording apparatus of the present invention comprises a rotating means for rotating the disc, a register for storing disc ID information having a parity of 12 bytes or more, and a second area for the disc. Recording means for recording disk ID information, to which parity of 12 bytes or more is added.

The first disc recording method of the present invention comprises a rotating step of rotating the disc, a storing step of storing the disc ID information having a parity of 12 bytes or more, and a second area of the disc. And a recording step of recording ID information of the disc, to which parity of 12 bytes or more is added.

The first disc reproducing apparatus of the present invention is based on the rotating means for rotating the disc, the reproducing means for reproducing the disc, and the error of the ID information based on the parity of 12 bytes or more reproduced by the reproducing means. And an error check and correct unit for correcting the error.

According to a first disc reproducing method of the present invention, a rotating step of rotating the disc, a reproducing step of reproducing the disc, and a reproducing step are performed.
It is characterized by including an error check and correct step for correcting an error in ID information based on a parity of 12 bytes or more.

The second recording medium of the present invention has a second area other than the first area for recording the content data, and a 16-byte parity is added to the second area. It is characterized in that its own ID information is arranged.

In the second area, n blocks each having a length obtained by equally dividing the second area into n in the circumferential direction are arranged,
ID information in which 16 bytes of parity is added to each of the n blocks can be arranged.

It is possible to write ID information in multiples of three or more.

A second disk recording apparatus of the present invention comprises a rotating means for rotating the disk, a register for storing disk ID information to which a 16-byte parity is added, and a second area of the disk. A recording means for recording ID information of the disc, to which 16-byte parity is added, is provided.

The second disc recording method of the present invention comprises a rotating step of rotating the disc, a storing step of storing the disc ID information to which a 16-byte parity is added, and a second area of the disc. , A 16-byte parity is added, and a recording step of recording the disc ID information.

The second disc reproducing apparatus of the present invention detects the error in the ID information based on the rotating means for rotating the disc, the reproducing means for reproducing the disc, and the 16-byte parity reproduced by the reproducing means. An error check and correct unit for correcting the error is provided.

According to a second disc reproducing method of the present invention, the disc is rotated by a rotating step, a reproducing step of reproducing the disc, and a reproducing step.
It is characterized by including an error check and correct step for correcting an error in the ID information based on the 16-byte parity.

In a third recording medium of the present invention, a second area other than the first area for recording content data is arranged, and the second area is divided into n equal parts in the circumferential direction. It is characterized in that n blocks having a length obtained by the above are arranged, and the same own ID information is arranged in each of the n blocks.

The third disk recording apparatus of the present invention comprises a rotating means for rotating the disk and n in the circumferential direction of the second area.
For each of the n blocks of length obtained by equally dividing,
A recording means for recording the same ID information is provided.

In the third disk recording method of the present invention, the same rotation step for rotating the disk and n blocks each having a length obtained by equally dividing the second area into n in the circumferential direction are the same. And a recording step of recording the ID information.

The third disc reproducing apparatus of the present invention is the same as the rotating means for rotating the disc, the reproducing means for reproducing the disc, and the same number recorded in each of the n blocks reproduced by the reproducing means. And an error check and collect unit for correcting an error in the ID information based on the ID information.

In the third disc reproducing method of the present invention, the disc is rotated by the rotating step, the disc reproducing step, and the reproducing step.
The same ID recorded in each of the n blocks
It is characterized by including an error check and correct step for correcting an error in the ID information based on the information.

In the fourth recording medium of the present invention, the second area other than the first area for recording the content data is arranged, and the second area has its own ID of three or more multiple writings. It is characterized in that information is arranged.

A fourth disc recording apparatus of the present invention comprises a rotating means for rotating the disc and a recording means for recording the disc ID information by multiple writing of 3 or more in the second area. And

A fourth disc recording method of the present invention comprises a rotating step of rotating the disc and a recording step of recording the disc ID information by multiple writing of 3 or more in the second area. And

According to a fourth disc reproducing apparatus of the present invention, based on the rotating means for rotating the disc, the reproducing means for reproducing the disc, and the three or more multiple-written ID information reproduced by the reproducing means, An error check and collect unit for correcting an error in ID information is provided.

According to a fourth disc reproducing method of the present invention, a disc is rotated by a rotating step, a disc reproducing step, and a reproducing step.
It is characterized by including an error check and correct step for correcting an error in the ID information based on the ID information of three or more pieces written in multiplex.

In the first recording medium of the present invention, a second area other than the first area for recording content data is arranged, and the second area has ID information added with a parity of 12 bytes or more. Are placed.

In the first disk recording apparatus and method of the present invention, parity of 12 bytes or more is added,
The disc ID information is stored, and the second area of the disc has a parity of 12 bytes or more.
ID information is recorded.

In the first disk reproducing apparatus and method of the present invention, the disk is rotated and reproduced, and the error of the ID information is corrected based on the reproduced parity of 12 bytes or more.

In the second recording medium of the present invention, the second area other than the first area for recording the content data is arranged, and the second area is provided with ID information added with 16-byte parity. Will be placed.

In the second disc recording apparatus and method of the present invention, the disc ID information to which 16-byte parity is added is stored and the disc second information is stored in the second area of the disc.
Disc ID information with 16-byte parity added is recorded.

In the second disk reproducing apparatus and method of the present invention, the disk is rotated and reproduced, and the error of the ID information is corrected based on the reproduced 16-byte parity.

In the third recording medium of the present invention, a second area other than the first area for recording the content data is arranged, n blocks are arranged in the second area, and n blocks are arranged. The same ID information is arranged in each of the blocks.

In the third disk recording apparatus and method of the present invention, the same ID is assigned to each of the n blocks.
Information is recorded.

In the third disk reproducing apparatus and method of the present invention, the disk is rotated and reproduced, and the ID is recorded based on the same ID information recorded in each of the reproduced n blocks. Information errors are corrected.

In the fourth recording medium of the present invention, a second area other than the first area for recording content data is arranged, and ID information of 3 or more is multiple-written in the second area. .

In the fourth disc recording apparatus and method of the present invention, the disc ID information is 3 in the second area.
The above is overwritten.

In the fourth disc reproducing apparatus and method of the present invention, the disc is rotated and reproduced, and the error of the ID information is corrected based on the reproduced three or more pieces of the ID information of multiple writing.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 3, the outer side (in the case of this example, the inner side) of the data area 26B in which the content data of the inner circumference of the optical disc 26 is recorded.
Disc-specific ID information is recorded in the burst cutting area (BCA) 26A. Then, as shown in the figure, the burst cutting area 26A is
It is formed so that one round is continuous.

FIG. 4 shows an example of the disc ID recording format recorded in the BCA 26A. As shown in the figure, one round is equally divided into n (n = 6 in this example) to form n blocks.

Each block is further divided into m (m = 2 in the example of FIG. 4) frames. Then, each frame is divided into k (k = 234 in this example) pieces, and ID information is recorded by k channel bits.

The top 10 channel bits of each frame are used as a frame sync. Then, the subsequent 224 channel bits are used as a data area.

Assuming that the disc ID information is modulated by a PE (Phase Encode) modulation method, in the case of PE modulation, 1-bit data is converted into 2-bit channel bits, so that data that can be recorded in 1 frame can be recorded. The number of bits is 112 bits (224 channel bits), which is 1
The information bits that can be recorded in a block are 224 bits (2
8 bytes).

In this example, the disc ID information in the ECC format as shown in FIG. 5 is recorded in each block. In this example, 12-byte parity is added to 16-byte data, and Reed-Solomon code RS (32, 32) of Galois field GF (2 ⁸ ).
The coding is performed according to (16, 13). The three blocks have the same ECC format. That is, one of 16-byte ID information ID _m is set as the 14-byte information bit of the first frame of each block.
4 bytes are arranged, and the remaining 2 bytes of ID information ID _m information are used as 14 bytes of information bits of the next frame,
12-byte parity is arranged.

This means that the same disc ID information is triple-written on the circumference of the disc. This triple writing is equivalent to forming a product code of distance 3 in the substantially vertical direction.

In PE modulation, as shown in FIG. 6, a mark (1) (bits shown in black in the figure) and a space (0).
It is a code indicating a data bit according to the position of (bit shown in white in the figure). In the example of FIG. 6, the data bit is “0”.
Is a channel bit (word) of "10", a data bit "1" is a channel bit (word) of "01",
Each is converted. In PE modulation, the center of two channel bits that represent data bits (the center of the word)
The channel bit is inverted by. That is, in the data bits, marks or spaces are not consecutive in three or more channel bits.

Therefore, the sync pattern indicating the sync bit (frame sync) is 3 channel bits or more, a mark,
Alternatively, it can be configured by making the spaces continuous. FIG. 7 shows an example of the sync pattern of the frame sync.

As shown in FIGS. 7A and 7B, two types of 6-channel bit synchronization patterns in which marks and spaces are continuous by 3 channel bits are prepared as frame sync patterns. If the channel bit of the data immediately before the frame sync is "01",
"000111" is used as the frame sync, and "01" is added as the subsequent sync pattern. on the other hand,
The channel bit of the data immediately before the frame sync is "1".
In the case of "0", "111000" is set as the frame sync.
Is used, and “10” is added as the subsequent sync pattern. Furthermore, the above sync body (“000111
01 ”or“ 111100010 ”), followed by Sync I
A channel bit of "01" or "10" is added as D, and a frame sync is configured with a total of 10 channel bits. Hereinafter, when the sync ID pattern is “0” (channel bit = “10”) (FIG. 7A), the frame sync is SA, and when the sync ID pattern is “1” (channel bit = “01”) ( The frame sync in FIG. 7B is SB.

The frame sync SA is used to indicate that it is the first frame of a block, and the frame sync SB is used to indicate that it is a frame other than the first frame of each block. Therefore, the frame sync is SA
The number of frames considered to be equal to the number of blocks.

FIG. 8 is a block diagram showing the structure of a disk ID recording device 11 to which the present invention is applied.

The register 21 has the ECC shown in FIG.
Disk I error-correction coded according to the format
D information is stored. The PE modulation unit 22 reads the disk ID information stored in the register 21 and sets P
It is E-modulated and output to the laser 23. The PE modulator 22 is
In accordance with a clock (channel clock) input from a VCO (voltage controlled oscillator) 33, the disc ID information read from the register 21 is PE-modulated, a sync pattern is inserted, and BC of the optical disc 26 is inserted.
The data recorded in A26A is generated and output to the laser 23.

The laser 23 is, for example, a YAG laser, and irradiates the optical disc 26 with a high-power laser beam via the mirror 24 and the objective lens 25. The objective lens 25 includes, for example, a cylindrical lens, and irradiates the BCA 26 of the optical disc 26 with the incident laser beam. As a result, the reflection film of the optical disc 26 is irreversibly changed, and the disc ID information is recorded as a bar code.

The spindle motor 27 rotates the optical disc 26 under the control of the spindle servo control unit 28, and an FG (Frequencc) (not shown) provided inside the optical disc 26.
The y generator signal generator generates an FG signal which becomes one pulse each time the optical disc 26 (spindle motor 27) rotates by a predetermined angle, and outputs the FG signal to the spindle servo control unit 28. The spindle servo control unit 28
According to the control of the controller 29, the spindle motor 27
Based on the FG signal input from the spindle motor 27, the spindle motor 27 is controlled so that the spindle motor 27 rotates at a predetermined rotation speed. In addition, the spindle servo control unit 28
Is an FG signal input from the spindle motor 27,
Output to the controller 29 and PC (Phase Comparator) 31.

The controller 29 controls the spindle servo control unit 28 to drive the spindle motor 27 according to an operation signal input from an operation unit (not shown),
A control signal for controlling the frequency division ratio of the frequency divider 30 is generated based on the FG signal input from the spindle servo control unit 28 to rotate the optical disc 26, and the frequency divider 30 is generated.
Output to.

Frequency divider 30, PC 31, LPF (Low Pass)
Filter) 32 and VCO 33 form a PLL.

The frequency divider 30 divides the clock output from the VCO 33 into a value 1 / N (frequency division ratio) set based on the control signal input from the controller 29, and PC3
Output to 1. The PC 31 compares the phase of the clock input from the frequency divider 30 with the phase of the FG signal input from the spindle servo control unit 28 to generate a phase difference signal, and L
Output to PF32. The LPF 32 removes a high frequency component from the input signal and outputs it to the VCO 33. VCO
33 is a voltage (that is, LPF) applied to the control terminal.
The phase (frequency) of the clock to be oscillated and output is changed based on the output from 32).

The clock output from the VCO 33 is input to the PE modulator 22 and also to the frequency divider 30, the output of the frequency divider 30 and the spindle servo controller 28.
So that the phase difference between the FG signals output by
Since 33 is controlled, the output of the VCO 33 is a signal that is synchronously oscillated by N times the FG signal. The PE modulator 22 is
Data of the format described with reference to FIG. 4 is output to the laser 23 according to the clock input from the VCO 33.

A drive 34 is connected to the controller 29. A magnetic disk 41, an optical disk 42, a magneto-optical disk 43, or a semiconductor memory 44 is appropriately mounted on the drive 34, and a necessary computer program or the like is read out and supplied to the controller 29.

Next, the operation will be described. When the start of recording is instructed, the controller 29 controls the spindle servo control unit 28 to rotate the spindle motor 27 at a predetermined speed. The spindle motor 27 generates an FG signal corresponding to the rotation and supplies it to the spindle servo control unit 28. The spindle servo control unit 28
This FG signal is supplied to the PC 31.

The PC 31 compares the phases of the two input signals and outputs the phase error signal via the LPF 32 to the VCO 33.
Supply to. The VCO 33 generates a clock having a phase and frequency corresponding to the signal (control voltage) supplied from the LPF 32.

The clock output from the VCO 33 is supplied to the frequency divider 30, divided by a predetermined frequency division ratio set via the controller 29, and supplied to the PC 31.

As described above, the clock (channel clock) output from the VCO 33 becomes a clock corresponding to a cycle of 1 / (n × m × k) of one turn of the optical disk 26 (spindle motor 27). For example, if the FG wave number per rotation of the FG signal is 36 and the value of the frequency division ratio 1 / N in the frequency dividing circuit 30 is 1/39, then 1 / time of one rotation of the spindle motor 27 (optical disk 26) is obtained. (3 x
A channel clock having a cycle of 2 × 234) is generated.

The PE modulator 22 PE-modulates the disk ID information supplied from the register 21 based on the channel clock supplied from the VCO 33, and outputs it to the laser 23. The laser 23 generates a laser beam based on the data supplied from the PE modulation unit 22, and the mirror 2
The optical disc 26 is irradiated with light through the objective lens 4 and the objective lens 25. In this way, the disc ID information is recorded concentrically and over a plurality of tracks on the BCA 26A of the optical disc 26 at the time of factory shipment.

The channel clock output from the VCO 33 may be set to r times and r / (n × m × k) according to the output intensity required by the laser 23. In this case, the frequency division coefficient N of the frequency divider 30 is also multiplied by r.

FIG. 9 shows a configuration of a disc recording / reproducing apparatus 51 for recording data in the data area 26B of the optical disc 26 in which the disc ID information is recorded in the BCA 26A as described above and reproducing the recorded data. It is a block diagram shown.

The CPU 61 controls each unit of the disc recording / reproducing apparatus 51 in order to record data in the data area 26B of the optical disc 26 or reproduce the recorded data in accordance with an operation signal input from an operation unit (not shown). To control. When the CPU 61 reproduces the data,
Alternatively, a control signal for outputting the disc ID information of the optical disc 26 held in the register 71 to the decryption processing unit 74 or the encryption processing unit 75 when recording data, or for instructing rotation or stop of the optical disc 26. Is generated and output to the servo control unit 63.

The servo controller 63 seeks the optical pickup 64 to a predetermined position on the optical disk 26 based on a control signal input from the CPU 61, and a tracking error signal (TK) supplied from a matrix amplifier (MA) 65. ) And the focus error signal (FS),
Tracking control and focus control of the optical pickup 64 are performed. The spindle motor 62 rotates the optical disc 26 at a predetermined rotation speed under the control of the servo control unit 63.

When the disc ID information is reproduced, the optical disc 26 has a CAV (Constant Angular Velocity).
It is rotated by the method.

The optical pickup 64 is held by a predetermined sled mechanism so as to be movable in the radial direction of the optical disk 26. When the data recorded on the optical disc 26 is read, the optical pickup 64 irradiates the optical disc 26 with a laser beam according to a control signal input from the servo control unit 63, receives the reflected beam, and converts it into an electrical signal. It is converted and output to the matrix amplifier 65. In addition, the optical pickup 64 uses the optical disc 26.
When new data is to be recorded on the optical disc 26, the optical disc 26 is irradiated with a laser beam based on the data output from the modulator 77, and the data is recorded in the data area 26B of the optical disc 26.

The matrix amplifier 65 processes the signal input from the optical pickup 64 and outputs a reproduction signal of data corresponding to the disc ID information recorded in the BCA 26A to the LPF 66. Also, the matrix amplifier 6
Reference numeral 5 generates a tracking error signal whose signal level changes according to the tracking error amount and a tracking error signal whose signal level changes according to the focus error amount, and outputs the tracking error signal to the servo control unit 63, and the data area 26
The reproduction signal of the data recorded in B is output to the demodulation unit 72.

The LPF 66 suppresses the fluctuation of the reproduced signal due to noise by removing the high frequency component of the input signal, and outputs it to the comparator 67. The comparator 67 binarizes the input signal by comparing it with a predetermined level. The demodulation unit 68 includes the crystal oscillator 6
Based on the sampling clock input from 9, the input signal is sampled, channel position correction is performed and demodulated (PE demodulation here), and ECC (Error Check
and Correct) output to the section 70. The number of sampling clocks is n × m × k × p per disk rotation.
(N, m, and k are the disk I described with reference to FIG.
It is a numerical value based on the D recording format, and p is set to be an integer of 2 or more). ECC section 70
Supplies the input demodulation data (disc ID information) to the register 71 to store it.

On the other hand, the demodulation section 72 includes the matrix amplifier 6
The data (content data) supplied from No. 5 is demodulated and supplied to the ECC unit 73. The ECC unit 73 performs error correction processing on the input demodulated data, and then supplies it to the descrambling processing unit 74. The decryption processing unit 74 decrypts the encryption of the content data supplied from the ECC unit 73 based on the disc ID information supplied from the register 71, and outputs it to a device (not shown).

The encryption processing unit 75 encrypts the input content data based on the disc ID information supplied from the register 71, and outputs it to the ECC unit 76. EC
The C unit 76 adds an error correction code to the input encrypted content data and then outputs it to the modulation unit 77.

A magnetic disk 91, an optical disk 92, a magneto-optical disk 93, or a semiconductor memory 94 is mounted on the drive 81 as needed, and the drive 81 supplies the program read from them to the CPU 61.

Next, the operation will be described. When the optical disc 26 is mounted on the disc recording / reproducing device 51, the CPU 61 controls the servo control unit 63 to rotate the spindle motor 62 at a constant angular velocity (by the CAV method). This speed corresponds to the disk ID recording device 11 of FIG.
The spindle motor 27 is set to the same speed as when the optical disk 26 is rotated.

At this time, the servo control unit 63 also moves the optical pickup 64 in the radial direction of the optical disc 26 to reproduce the BCA 26A of the optical disc 26.

The reproduction data output from the optical pickup 64 is input from the matrix amplifier 65 to the comparator 67 via the LPF 66 and binarized. Demodulation unit 6
Reference numeral 8 samples and demodulates the binarized data input from the comparator 67 based on the sampling clock supplied from the crystal oscillator 69. Further, the demodulation unit 68 performs a process of correcting the channel bit and the word. The details of the processing will be described later.

The demodulated data output from the demodulator 68 is
It is supplied to the ECC unit 70, subjected to error correction processing based on the error correction code, supplied to the register 71, and stored therein. In this way, the optical disk 2 is stored in the register 71.
The disc ID information recorded in the BCA 26A of No. 6 is stored.

When the recording of the content data is instructed, the CPU 61 controls the servo control unit 63 to rotate the optical disc 26 by the CLV method via the spindle motor 62.

The encryption processing unit 75 encrypts the content data input from a device (not shown) based on the disc ID information stored in the register 71, and outputs it to the ECC unit 76. The ECC unit 76 adds an error correction code to the content data input from the encryption processing unit 75 and outputs the content data to the modulation unit 77. The modulation unit 77 includes the ECC unit 7
The content data input from 6 is modulated by the PE method or another predetermined modulation method and output to the optical pickup 64. The optical pickup 64 transfers the content data input from the modulator 77 to the data area 2 of the optical disc 26.
Record on 6B.

When the reproduction of the content data recorded in this way is instructed, the CPU 61 causes the servo control unit 63 to operate.
The optical disk 26 is rotated by the CLV method in the same manner as described above. The optical pickup 64 reproduces the data area 26B of the optical disc 26 and outputs the reproduced data to the matrix amplifier 65. The matrix amplifier 65 supplies this reproduction data to the demodulation unit 72. The demodulation unit 72 demodulates the reproduced data of the input content by a demodulation method corresponding to the modulation method of the modulation unit 77,
It is output to the ECC unit 73. The ECC section 73 is a demodulation section 72.
After performing error correction processing on the input demodulated data,
It is supplied to the descrambling processing unit 74. Decryption processing unit 74
Decrypts the content data (encrypted content data) input from the ECC unit 73 based on the disc ID information input from the register 71 and outputs the decrypted content data to a device (not shown).

As described above, since the content data is encrypted and recorded in the data area 26B of the optical disk 26, this encrypted content data is copied to another disk as it is by a computer or the like. However, since the disc ID information cannot be copied, the encryption cannot be released.
Unauthorized mass copying can be substantially suppressed.

Next, the channel position correction performed in the demodulation unit 68 will be described with reference to FIG. Here, description will be made assuming that p = 3.

The reproduced pit waveform (FIG. 10A) output from the LPF 66 is binarized by the comparator 67 and input to the demodulator 68 as a pit binarized signal (FIG. 10B). . The demodulation unit 68 has counters 1 to 3 (not shown) therein. The counter 1 (FIG. 10C) counts the number of clocks in the channel bit (that is, 0 to p-1). The counter 2 (FIG. 10D) counts 2 channel bits in PE modulation. Counter 3 (Fig. 10 (E))
Counts the number of PE modulation bits (words).

In PE modulation, the pit center (ie, the center of the word "10" shown in FIG. 6, or "0").
Channel position correction is performed by utilizing the fact that the bit is always inverted at the center of "1"). That is, at the timing A in FIG. 10, the value of the counter 3 does not change (even though it is at the center of the pit), but the level of the pit binarization signal is inverted. The value is corrected to be "0". Further, channel position correction is performed by utilizing the fact that the channel bit is inverted even between data bits (words between words) when the same data bit continues. That is, in FIG. 10, at the timing B, the counter 3
When the value of is changing (between words), the level of the pit binarization signal is inverted,
The values of the counter 1 and the counter 2 are corrected to “0”.

The frame sync is the optical disk 26.
Since the plurality of optical discs 26 are arranged at equal intervals per one rotation, the frame sync is endlessly generated at a constant cycle as the optical disc 26 rotates. Therefore, even when the frame sync of a certain frame is not detected, it is possible to reproduce the following data without loss based on the interpolation timing of the frame sync detected before that.

As shown in FIG. 11, the frame sync ("00011101XX" or "1110")
0010XX ") (FIG. 7) is detected, the values of counters 1 to 3 are all initialized to" 0 ".

The ECC section 70 receives the demodulated data (that is, the disk ID information including the triple-written parity described with reference to FIG. 4) and performs error correction processing. Error correction is performed on each of the triple-written disc ID information. Here, for example, when the error correction result of the third block is different from the error correction results of the other two blocks (first and second blocks), the first block and the second block are checked according to the principle of majority voting. The block error correction result is used as the disc ID information. ECC section 70
Outputs the error-corrected disc ID information to the register 71 for storage.

Further, the ECC section 70 can determine the correct word of each block by majority decision and collect the correct words to perform error correction processing on the generated code.

For example, in the case of the first word, if the first block and the second block match and the third block is different, the first word is the word of the first block (or the second block). To be correct. For the second word, the second and third blocks match,
If the first block is different, the second word is the correct word in the second block (or third block). Similarly, based on the principle of majority voting,
The correct words can be collected and one disc ID information can be reconstructed for which error correction processing can be performed.

When reproducing the disc ID,
As described above, since it is assumed that the reproducing operation is performed without applying the tracking servo, when the reproducing operation is repeatedly executed over a plurality of rotations of the optical disk 26, the radial position is slightly deviated, and the difference is caused. It is considered that a reproduction result (reproduction data) can be obtained. Therefore,
The reproduction operation or the correction operation can be performed over a plurality of rotations.

Next, as a second embodiment, a case where the disc ID information is modulated by 4-1 modulation and recorded will be described.

FIG. 12 shows an example of the disc ID recording format in this case.

Here, as in the case of the first embodiment, one round of the BCA 26A of the optical disk 26 is 3 times.
It is equally divided into three blocks, and one block is composed of two frames each having a sync block SA or SB at the head. The frame sync of each frame is 14 channel bits, and the information bit is 1.
There are 12 data bits. 112-bit data is
Since it is converted into 392 channel bits by 4-1 modulation, the number of channel bits in one frame is 406 (that is, n = 3, m = 2, k = 406). 1
224 bits, that is, 28 bytes of disc ID information can be recorded in the block.

As shown in FIG. 13, the 4-1 modulation is a modulation system in which 2 data bits are modulated into 7 channel bits. The first 3 channel bits are a synchronization pattern indicated by "010", and the last 4 channel bits are the data part, and the data is indicated by the position of "1" in the 4 channel bits. When the two data bits before modulation are "00", the data part is "1000", and when the two data bits are "01", the data part is "0100" and the two data bits are "0". When it is "10", the data part is "0010", and when two data bits are "11", the data part is "0001". With 7 channel bits including this synchronization pattern and data part,
One word is formed.

The PE modulation used in the first embodiment is a modulation method in which the logic "0" and the logic "1" appear in the same number. Therefore, in this case, in the BCA 26A, almost half of the reflective film is removed. On the other hand, in 4-1 modulation, the ratio of logic “0” and logic “1” is 5: 2, so the amount of reflected light is greater than when the disc ID information is recorded by PE modulation. . Therefore, for example, there is an advantage that servo control such as focus control at the time of reading data can be easily performed.

Also in this example, the ECC format of the disc ID information is the same as that described with reference to FIG. 5, and encoding is performed by the RS (32,16,13) code of GF (2 ⁸ ). , 12 bytes of parity are added to form one block, and the same block is triple-written on one circumference of the disk.

FIG. 14 shows a sync pattern of a frame sync in the second embodiment.

In the 4-1 modulation, the position of the logic "1" of the synchronization pattern of 3 channel bits is fixed. Therefore, if attention is paid to the logic "1" of the synchronization pattern that occurs every other, the interval is always "7".

Therefore, the sync pattern can be generated by breaking the regularity of the intervals at which the logic "1" is generated every other one. The sync pattern "01000010010100" shown in FIG. 14A in which the intervals at which every other logic "1" occurs is "8, 5, 6".
Is the first sync pattern SA. And FIG.
4 (B), a sync pattern “0” such that the intervals at which every other logic “1” occurs is “6, 5, 8”.
1000101001000 "is set as the second sync pattern SB. That is, in the second embodiment, the frame sync of 14 channel bits is the disk I
It is inserted in the D recording format.

FIG. 15 shows the disk I of the second embodiment.
3 is a block diagram showing a configuration of a disc ID recording device 11 that records D. The parts corresponding to those of the disk ID recording device 11 described with reference to FIG. 8 are designated by the same reference numerals, and the description thereof will be appropriately omitted (the same applies hereinafter). That is, this disc ID recording device 11 is the same as the PE of FIG.
It has the same configuration as the disc ID recording apparatus 11 of FIG. 8 except that a 4-1 modulator 111 is provided instead of the modulator 22. Therefore, the operation is also different only in the modulation method.

In the disc ID recording device 11 of FIG. 15, when the disc ID recording format described with reference to FIG. 12 is recorded on one round of the BCA 26A of the optical disc 26, one revolution of the optical disc 26 and n of FIG. ×
It suffices if the PLL is set so that m × k is synchronized. For example, when the wave number of the FG signal output from the spindle motor 27 is 42 and the frequency division coefficient N of the frequency divider 30 is 58, the cycle of the channel clock output from the VCO 33 is 1 / revolution. It becomes equal to (3 × 2 × 406).

4-1 by the disc ID recording device 11
Optical disc 2 on which disc ID information is recorded by a modulation method
The structure of the disk recording / reproducing device 51 for recording data in the data area 26B of No. 6 and reproducing the recorded data is basically the same as that shown in FIG. However, the processing in the demodulation unit 68 is different.

Channel position correction performed by the demodulator 68 will be described with reference to FIG. Here, as in the case of the first embodiment, p = 3 will be described.

The reproduction pit waveform (FIG. 16 (A)) output from the LPF 66 is binarized by the comparator 67 and input to the demodulator 68 as a pit binarized signal (FIG. 16 (B)). The demodulation unit 68 uses the input pit 2
The binarized signal is delayed by a fixed time to generate a pit center signal (FIG. 16 (D)) which rises at the exact center of the period in which the pit binarized signal becomes logic "1". Further, the demodulator 68 uses the counters 1 to 3 and the window for detecting the synchronization pattern (that is, the reproduction pits 2 when the values of the counter 2 are “0” to “2”).
It has a window generator inside which generates a window for reading a digitized signal (FIG. 16C). The counter 1 (FIG. 16E) counts the number of clocks (that is, 0 to p-1) in the channel bit. Counter 2 (FIG. 16 (F)) counts 7 channel bits in 4-1 modulation. Counter 3 (Fig. 16 (G))
Counts the number of words in 4-1 modulation.

When the pit center (FIG. 16 (D)) is detected, the channel position is corrected so that the value of the counter 1 becomes "1". For example, at the timing C of FIG. 16, the value of the counter 1 is corrected to “1” in synchronization with the detection timing of the pit center.
In addition, the pit center of the synchronization pattern (see FIG.
Word position correction is performed so that (D)) is in the center of the window (FIG. 16C). For example, at the timing D, the values of the counter 1 and the counter 2 are corrected to be “1”.

Since a plurality of frame syncs are arranged at equal intervals per one rotation of the optical disk 26, even when the frame sync of a certain frame is not detected, the frame sync detected before that is interpolated. Based on the timing, it is possible to reproduce the following data without loss.

Further, as shown in FIG. 17, the frame sync ("01000010" described with reference to FIG.
010100 "or" 0101010100100
If "0") is detected, the values of counters 1 to 3 are initialized to "0".

Next, as a third embodiment, the ECC format of the disc ID information recorded in the register 21 is, as shown in FIG. 18, R of GF (2 ⁸ ).
It is encoded by S (32,16,17) code, 16 bytes of parity is added, and one block is constructed.
A case will be described in which the same block is 4-1 modulated and triple-written on one circumference of the disk.

In this case, as shown in FIG. 19, the sync pattern of the frame sync is the sync I in each of the sync patterns SA and SB described with reference to FIG.
One word is added as D (sync ID) for a total of 21
It is considered as a channel bit. That is, in each of the sync patterns SA and SB, depending on the sync ID,
Since four types of sync patterns can be represented, a total of eight sync patterns can be configured.

Therefore, as shown in FIG. 20, one block can be divided into eight frames.

In this example, n = 3 and m = 8. Also, 32-bit data is arranged in one frame. Since this data is converted into 112 channel bits by 4-1 modulation, the value of k becomes 133 channel bits (= 21 + 112).

The optical disc 26 is, for example, a CD (Compac
t Disk), MD (Mini-Disk), DVD (Digital Versa)
tile disk).

The series of processes described above can also be executed by software. The software is, for example, a general-purpose personal computer, in which a program that constitutes the software is installed in dedicated hardware, or various functions can be executed by installing various programs. Installed from the recording medium.

This recording medium is shown in FIG. 8, FIG. 9 or FIG.
As shown in FIG. 5, a magnetic disk 41, 91 (including a floppy (registered trademark) disk) and an optical disk 42, 92 (including a floppy disk) on which a program is recorded, which is distributed in order to provide the program to the user, separately from the computer. CD-R
OM (Compact Disk-Read Only Memory), DVD (Digital
(Including Versatile Disk)), magneto-optical disk 43, 93
(Including MD (Mini-Disk)) or semiconductor memory 4
It is composed of a package medium such as 4, 94 or the like.

[0123]

As described above, according to the first recording medium of the present invention, the second area other than the first area for recording the content data is arranged, and the second area has 12 bytes or more. Since the ID information with the parity of is added is arranged, even if a defect occurs in the recording medium, it is possible to correct the channel bit or word, and it is possible to reproduce the ID information with high reliability. Can be realized.

According to the first disk recording apparatus and method of the present invention, the disk ID information to which the parity of 12 bytes or more is added is stored, and the parity of 12 bytes or more is added to the second area of the disk. Of the disc
Since the ID information is recorded, it is possible to correct the channel bit or word even if a defect occurs on the disc, and it is possible to realize high reliability when reproducing the ID information. .

According to the first disc reproducing apparatus and method of the present invention, the disc is rotated and reproduced, and the disc is reproduced.
Since the error in the ID information is corrected based on the parity of 12 bytes or more, even if a defect occurs on the disk, it is possible to correct the channel bit or word and reproduce the ID information. In this case, high reliability can be realized.

According to the second recording medium of the present invention, the second area other than the first area for recording the content data is arranged, and the second area has ID information with 16-byte parity added. Are arranged, it is possible to correct the channel bit or word even if a defect occurs in the recording medium, and it is possible to realize high reliability in reproducing the ID information.

According to the second disc recording apparatus and method of the present invention, the disc ID information to which 16-byte parity is added is stored, and the disc ID information is stored in the second area of the disc.
Since the disc ID information with 6-byte parity added is recorded, even if a disc defect occurs, it is possible to correct the channel bit or word, and to reproduce the ID information. , High reliability can be realized.

According to the second disc reproducing apparatus and method of the present invention, the disc is rotated and reproduced, and the disc is reproduced.
Since the error in the ID information is corrected based on the 16-byte parity, it is possible to correct the channel bit or word even if a defect occurs on the disk, and when reproducing the ID information. , High reliability can be realized.

According to the third recording medium of the present invention, the second area other than the first area for recording the content data is arranged, n blocks are arranged in the second area, and n blocks are arranged. Since the same ID information is arranged in each of the blocks, even if a defect occurs in the recording medium, it becomes possible to correct the channel bit or word and reproduce the ID information. On the occasion of
High reliability can be realized.

According to the third disc recording apparatus and method of the present invention, since the same ID information is recorded in each of the n blocks, even if a defect occurs on the disc, the channel bit , Or words can be corrected, and high reliability can be realized when reproducing the ID information.

According to the third disc reproducing apparatus and method of the present invention, the disc is rotated and reproduced, and the disc is reproduced.
The same ID recorded in each of the n blocks
Since the error of the ID information is corrected based on the information, even if the disc has a defect, it is possible to correct the channel bit or word, and it is possible to reproduce the ID information with high reliability. Can be realized.

According to the fourth recording medium of the present invention, the second area other than the first area for recording the content data is arranged, and the ID information is multiple-written with 3 or more in the second area. Therefore, even if a defect occurs in the recording medium, it is possible to correct the channel bit or word, and when reproducing the ID information,
High reliability can be realized.

According to the fourth disc recording apparatus and method of the present invention, since the disc ID information of 3 or more is multiplexed and written in the second area, even if a disc defect occurs, It becomes possible to correct the channel bit or the word, and it is possible to realize high reliability when reproducing the ID information.

According to the fourth disc reproducing apparatus and method of the present invention, the disc is rotated and reproduced, and the disc is reproduced.
Since the error of the ID information is corrected based on the ID information of multiple writing of 3 or more, even if the disk has a defect, it is possible to correct the channel bit or the word, and the ID information can be corrected. It is possible to realize high reliability in reproducing the.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a burst cutting area in a conventional DVD.

FIG. 2 is a diagram showing a recording format of a burst cutting area in FIG.

FIG. 3 is a diagram showing a configuration of an optical disc to which the present invention is applied.

FIG. 4 is a diagram showing a recording format of a burst cutting area in FIG.

FIG. 5 E in the burst cutting area of FIG.
It is a figure explaining CC format.

FIG. 6 is a diagram illustrating PE modulation.

FIG. 7 is a diagram illustrating a sync pattern of the frame sync of FIG.

8 is a block diagram showing a configuration example of a disc ID recording device for recording disc ID information on the optical disc of FIG. 3. FIG.

9 is a block diagram showing a configuration example of a disc recording / reproducing device for recording / reproducing data on / from an optical disc on which a disc ID is recorded by the disc ID recording device of FIG. 8.

FIG. 10 is a diagram for explaining the operation of the demodulator of FIG.

FIG. 11 is a diagram for explaining the operation of the demodulation unit in FIG.

FIG. 12 is a diagram showing an example of another format in the burst cutting area of the optical disc of FIG.

FIG. 13 is a diagram illustrating 4-1 modulation.

14 is a diagram illustrating a sync pattern of the frame sync of FIG.

15 is a block diagram showing a configuration example of a disc ID recording device for recording a disc ID in the format of FIG.

16 is a diagram for explaining a reproducing operation of the optical disc recorded in the format of FIG.

FIG. 17 is a diagram illustrating a reproducing operation of an optical disc recorded in the format of FIG.

FIG. 18 is a diagram showing an example of another ECC format.

FIG. 19 is a diagram showing an example of another sync pattern of a frame sync.

FIG. 20 is a diagram showing another example of a disc ID recording format.

[Explanation of symbols]

22 PE modulator, 23 laser, 26 optical disk, 26A burst cutting area, 26B
Data area, 28 spindle servo controller,
29 controller, 30 frequency divider, 31 phase comparator, 33 VCO

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G11B 20/18 G11B 20/18 572F 574 574H 576 576C 576F

Claims (24)

[Claims] 1. A second area other than the first area for recording content data is arranged, and the second area is provided with ID information of its own, to which a parity of 12 bytes or more is added. A recording medium characterized in that 2. In the second area, n blocks each having a length obtained by equally dividing the second area into n in the circumferential direction are arranged, and each of the n blocks includes: The recording medium according to claim 1, wherein the ID information, to which parity of 12 bytes or more is added, is arranged. 3. The recording medium according to claim 1, wherein the ID information is written in multiples of three or more. 4. A disc recording apparatus for recording disc ID information with a predetermined code in a second area of the disc other than the first area for recording content data, the rotating means rotating the disc. A register for storing the ID information of the disk, to which parity of 12 bytes or more is added, and the ID information of the disk to which parity of 12 bytes or more is added to the second area of the disk A disk recording apparatus comprising: a recording unit for recording 5. A disc recording method for recording disc ID information with a predetermined code in a second area of the disc other than the first area for recording content data, the rotating step of rotating the disc, A storage step of storing the ID information of the disk having a parity of 12 bytes or more; and the ID of the disk having a parity of 12 bytes or more added to the second area of the disk. A disc recording method comprising: a recording step of recording information. 6. A disc reproducing apparatus for reproducing a disc having own ID information recorded, wherein a parity of 12 bytes or more is added to a second area other than the first area for recording content data. The rotating means for rotating the disk, the reproducing means for reproducing the disk, and the error check and correct for correcting the error of the ID information based on the parity of 12 bytes or more reproduced by the reproducing means. And a disk reproducing device. 7. A disc reproducing method for reproducing a disc having its own ID information recorded, wherein a parity of 12 bytes or more is added to a second area other than the first area for recording content data. , A rotation step of rotating the disk, a reproduction step of reproducing the disk, and an error check for correcting an error of the ID information based on the parity of 12 bytes or more reproduced by the processing of the reproduction step. A disc reproducing method comprising an and collect step. 8. A second area other than the first area for recording content data is arranged, and in the second area, 16-byte parity is added and own ID information is arranged. A recording medium characterized by the following. 9. In the second area, n blocks each having a length obtained by equally dividing the second area into n in the circumferential direction are arranged, and each of the n blocks includes: 9. The recording medium according to claim 8, wherein the ID information, to which a 16-byte parity is added, is arranged. 10. The recording medium according to claim 8, wherein the ID information is multiple-written by three or more. 11. A disc recording device for recording disc ID information with a predetermined code in a second area other than a first area for recording content data of a disc, comprising: rotating means for rotating the disc. A register for storing the ID information of the disk, to which 16 bytes of parity is added, and a record of the ID information of the disk, to which the 16 bytes of parity is added, in the second area of the disk. A disk recording device, comprising: 12. A disc recording method for recording disc ID information with a predetermined code in a second area of the disc other than the first area for recording content data, the rotating step of rotating the disc, A storage step of storing the ID information of the disk with 16-byte parity added; and a step of storing the ID information of the disk with 16-byte parity added to the second area of the disk. A disk recording method comprising a recording step of recording. 13. A disc reproducing apparatus for reproducing a disc in which 16-byte parity is added to a second area other than the first area for recording content data, in which the own ID information is recorded. A rotating means for rotating the disk, a reproducing means for reproducing the disk, and an error checking and collecting section for correcting an error in the ID information based on the 16-byte parity reproduced by the reproducing means. A disc reproducing apparatus comprising: 14. A disc reproducing method for reproducing a disc in which a 16-byte parity is added to a second area other than the first area for recording content data, in which the own ID information is recorded. A rotation step of rotating the disk, a reproduction step of reproducing the disk, and an error check and correct for correcting an error of the ID information based on the 16-byte parity reproduced by the processing of the reproduction step. And a step of reproducing the disc. 15. A second area other than the first area for recording content data is arranged, and in the second area, n of the second area is circumferentially arranged.
A recording medium characterized by arranging n blocks of a length obtained by equally dividing each of the n blocks and the same ID information of its own. 16. A disc recording apparatus for recording ID information of the disc with a predetermined code in a second area of the disc other than the first area for recording the content data, the rotation means rotating the disc. A disc recording apparatus, comprising: a recording unit that records the same ID information in each of n blocks having a length obtained by dividing the second area into n equal parts in the circumferential direction. 17. A disc recording method for recording ID information of the disc with a predetermined code in a second area of the disc other than the first area for recording content data, the rotating step comprising rotating the disc. A recording step of recording the same ID information in each of n blocks having a length obtained by equally dividing the second area in the circumferential direction into n blocks. 18. The same own ID information is assigned to each of n blocks having a length obtained by equally dividing a second area other than the first area for recording content data into n in the circumferential direction. In a disc reproducing apparatus for reproducing a disc on which is recorded, a rotating means for rotating the disc, a reproducing means for reproducing the disc, and n pieces of the blocks reproduced by the reproducing means. , Based on the same ID information,
A disc reproducing apparatus, comprising: an error check and correct unit that corrects an error in the ID information. 19. The same own ID information is assigned to each of n blocks having a length obtained by equally dividing a second area other than the first area for recording content data into n in the circumferential direction. In a disc reproducing method for reproducing a disc on which is recorded, a rotating step of rotating the disc, a reproducing step of reproducing the disc, and each of the n blocks reproduced by the process of the reproducing step. A disc reproducing method comprising: an error checking and collecting step of correcting an error of the ID information based on the same recorded ID information. 20. A second area other than the first area for recording content data is arranged, and in the second area, three or more multiple-written own ID information is arranged. Characteristic recording medium. 21. A disc recording device for recording ID information of the disc with a predetermined code in a second area other than the first area for recording content data of the disc, comprising a rotating means for rotating the disc. A disc recording apparatus, comprising: a recording unit that records the ID information of the disc by multiple writing of three or more in the second area. 22. A disc recording method for recording ID information of the disc with a predetermined code in a second area of the disc other than the first area for recording content data, the rotating step comprising rotating the disc. And a recording step of recording the ID information of the disc by multiple writing of three or more in the second area. 23. A disc reproducing apparatus for reproducing a disc in which the self ID information of 3 or more is recorded in a second area other than the first area for recording content data, Rotating rotating means, reproducing means for reproducing the disc, and error checking and collecting section for correcting an error in the ID information based on the ID information which is reproduced by the reproducing means and has three or more pieces written in multiplex. A disc reproducing apparatus comprising: 24. A disc reproducing method for reproducing a disc in which the self ID information of 3 or more is recorded in a second area other than the first area for recording content data, wherein the disc is A rotation step of rotating, a reproduction step of reproducing the disc, and an error check and correction for correcting an error of the ID information based on the ID information of 3 or more pieces which are reproduced by the processing of the reproduction step. A disk reproducing method including a collecting step.