JP5041086B2 - Recording device, playback device, and disk medium - Google Patents

Description

The present invention relates to a recording apparatus , a reproducing apparatus , and a disk medium, and more particularly to a recording apparatus , a reproducing apparatus , and a disk medium that can record address information as a wobble of a groove on the disk medium.

  Conventionally, in a disk medium such as an optical disk, a magnetic disk, and a magneto-optical disk, a spiral groove is formed for tracking. It is also known to record address information by wobbling a groove corresponding to the address information.

  For example, a CD-R (Compact Disc-Recordable) or MD (Mini-Disc) is a spiral carrier signal that is FM-modulated based on address information (hereinafter referred to as an FM-modulated signal). A wobbling groove is formed corresponding to the above.

  However, in the method of wobbling the groove corresponding to the FM modulation signal, the address information cannot be detected with high accuracy, and it is arbitrary when data is recorded on the disk medium and when the recorded data is reproduced. Could not be accessed with high accuracy. For this reason, when data is recorded on the disk medium, it is necessary to provide a very large link area (area where data is not recorded) before and after the data, and the recording area of the disk medium is wasted.

  The present invention has been made in view of such a situation, and makes it possible to quickly and accurately access an arbitrary address by making it possible to accurately reproduce address information.

According to a first aspect of the present invention, there is provided a recording apparatus for reproducing an address of the disk medium based on a groove formed on the disk medium and recording recording data at the reproduced address. Irradiation means for irradiating the medium with laser light, extraction means for receiving reflected light from the disk medium and extracting a reflected light signal corresponding to the groove, and address information based on the extracted reflected light signal The address information recorded as groove wobbles formed on the disk medium is composed of 83 units ADIP units, and an integral multiple of the 83 units ADIP units is an integer multiple of the disk medium. The size corresponds to one recording unit block, and the address information includes a plurality of addresses in one recording unit block. It has 2-bit data indicating a RUB address number for distinguishing the ADIP units. The 83 units ADIP units are composed of an 8 units synchronization unit and a 75 units data unit, and the data unit is a 4-bit ADIP unit. composed of 15 blocks the 5 bits including bits as one block.

In the recording apparatus according to the first aspect of the present invention, the disk medium is irradiated with laser light, the reflected light from the disk medium is received, the reflected light signal corresponding to the groove is extracted, and the extracted reflected light is extracted. Address information is reproduced based on the signal.

The reproducing apparatus according to the second aspect of the present invention is a reproducing apparatus for reproducing the address of the disk medium based on a groove formed on the disk medium, and an irradiating means for irradiating the disk medium with laser light, and the disk Receiving the reflected light from the medium and extracting a reflected light signal corresponding to the groove; and reproducing means for reproducing address information based on the extracted reflected light signal; The address information recorded as a wobble of the formed groove is composed of 83 units ADIP units, and an integral multiple of the 83 units ADIP units is a size corresponding to one recording unit block of the disk medium, The address information indicates a RUB address number for distinguishing a plurality of the ADIP units in one recording unit block. It has 2 bits of data, the 83units ADIP units consist of an 8units synchronization part and a 75units data part, and the data part is 15 blocks with 5 bits including 4 bits of ADIP bits as one block. It constituted by.

In the reproducing apparatus according to the second aspect of the present invention, the disk medium is irradiated with laser light, the reflected light from the disk medium is received, the reflected light signal corresponding to the groove is extracted, and the extracted reflected light is extracted. Address information is reproduced based on the signal.

The disk medium according to the third aspect of the present invention has a spiral shape and is formed with a wobbled groove corresponding to an MSK modulation signal corresponding to address information, and the address information is 83 units. It is composed of ADIP units, and an integer multiple of 83 units ADIP units is a size corresponding to the recording unit block of the disk medium, and the address information is used to distinguish a plurality of ADIP units in one recording unit block. It has 2 bits of data indicating the RUB address number. The 83 units ADIP units consist of an 8 units synchronization part and a 75 units data part, and the data part contains 5 bits including 4 bits ADIP bits. composed of 15 blocks with blocks.

  According to the first aspect of the present invention, it is possible to record address information on the disk medium so that the position of the synchronization signal can be accurately detected.

  According to the second aspect of the present invention, an arbitrary address can be reproduced quickly and accurately.

  According to the third aspect of the present invention, an arbitrary address can be accessed quickly and accurately.

It is a block diagram which shows the structural example of the address recording device which is one embodiment of this invention. It is a figure for demonstrating the groove formed in a spiral shape. It is a figure for demonstrating the wobble of a groove. It is a figure for demonstrating the non-modulation part and modulation | alteration part of an MSK modulation signal. It is a figure which shows a monotone bit and an ADIP bit. It is a figure which shows the structure of the address information (ADIP) corresponding to recording / reproducing cluster RUB. It is a figure which shows the structure of an 8-bit sync part. It is a figure which shows four types of sync unit patterns contained in a sync part. It is a figure which shows the structure of a 75-bit data part. It is a figure which shows two types of ADIP unit patterns. It is a figure for demonstrating the error correction code | symbol of address data. It is a flowchart explaining the address recording process of an address recording device. 2 is a block diagram showing an example of the configuration of an optical disc drive that reproduces address information from an optical disc 5. FIG. 6 is a diagram for explaining a process of demodulating a DMSK modulated signal by a wobble circuit 32. FIG. 6 is a diagram for explaining a process of demodulating a GDMSK modulated signal by the wobble circuit 32. FIG.

  FIG. 1 shows a configuration example of an address recording apparatus according to an embodiment of the present invention. When the optical disk is manufactured, the address recording apparatus has a spiral shape for tracking as shown in FIG. 2 and a wobbling groove corresponding to address information as shown in FIG. Is formed.

  In the address recording apparatus, the address generating unit 1 generates address information of digital data including a synchronization signal for indicating the position of address data, address data, and an error correction code of the address data, and pre-encodes the modulation unit 3 is output.

  The carrier signal generation unit 2 generates a carrier signal carrying address information and outputs it to the modulation unit 3.

  The modulation unit 3 performs MSK (Minimum Shift Keying) modulation on the carrier signal input from the carrier signal generation unit 2 in accordance with the pre-encoded address information from the address generation unit 1. Then, the resulting MSK modulation signal as shown in FIGS. 4B to 4D is output to the wobble forming unit 4. The MSK modulation used here may be DMSK (Differential Minimum Shift Keying) modulation or GDMSK (Gausian filtered Differential Minimum Shift Keying) modulation.

  Among the MSK modulated signals, as shown in FIG. 4B, one wobble (one period wobble) of a signal having the same frequency as the carrier signal is converted into a code “0” of the pre-encoded address information. Correspond. Also, among the MSK modulation signals, as shown in FIG. 4C, 1.5 waves of a signal having a frequency 1.5 times that of the carrier signal (2/3 times the wavelength) (1 wobble of the carrier signal). Corresponds to the code “1” of the pre-encoded address information.

  For example, the MSK modulation signal as shown in FIG. 4D corresponds to the pre-encoded address information code “1010”.

  Hereinafter, a portion of the MSK modulated signal having the same frequency as the carrier signal is described as a non-modulated portion. A portion of the MSK modulated signal having a frequency 1.5 times that of the carrier signal is described as a modulated portion. Further, when describing the wave number of the modulation part, it is described using the number of wobbles of the corresponding non-modulation part.

  The wobble forming unit 4 forms a groove on the optical disc 5 that is spirally wobbled in accordance with the MSK modulation signal input from the modulating unit 3.

  As shown in FIG. 5, one bit of the address information is classified into a monotone bit (monotone bit) including the first signal of 42 wobbles, an ADIP bit including the second signal in 42 wobbles, and the like. .

  The control unit 6 controls the drive 7 to read the control program stored in the magnetic disk 8, the optical disk 9, the magneto-optical disk 10, or the semiconductor memory 11, and based on the read control program, the address recording device To control the whole.

  FIG. 6 shows the structure of address information recorded corresponding to a recording / reproducing cluster RUB (Recording Unit Block) of the optical disk 5. Two address information (ADIP: Address In Pre-groove) is recorded in the recording / reproducing cluster RUB. One address information consisting of 83 bits consists of an 8-bit sync part (SYNC) indicating a synchronization signal, and a 75-bit data part (Data) indicating address data and its error correction code.

  FIG. 7 shows the structure of an 8-bit sync part. As shown in the figure, the sync part is composed of four sync blocks “1” to “4” each composed of one monotone bit and one sync bit.

  As shown in FIG. 8, the sync bit of 1 bit (42 wobbles) is composed of a sync unit of 14 wobbles including the second signal and a monotone of 28 wobbles (first signal).

  FIGS. 8A to 8D show wobbles corresponding to sync blocks “1” to “4”, that is, MSK modulated signals, respectively.

  The sync unit of the sync block “1” is formed as a wobble indicating the first sync unit pattern “10101010000000” as shown in FIG. The sync unit of the sync block “2” is formed as a wobble indicating the second sync unit pattern “10100010100000” as shown in FIG. The sync unit of the sync block “3” is formed as a wobble indicating the third sync unit pattern “10100000101000” as shown in FIG. The sync unit of the sync block “4” is formed as a wobble indicating the fourth sync unit pattern “1010000010010” as shown in FIG.

  The 8-bit sync part includes all of the first to fourth patterns described above. At the time of reproduction, at least one of the first to fourth patterns can be reproduced. If possible, the position of the sync part can be determined, that is, the address information can be accurately reproduced.

  FIG. 9 shows the structure of a 75-bit data part. As shown in the figure, the data part is composed of 15 ADIP blocks “1” to “15” composed of 1 monotone bit and 4 ADIP bits.

  As shown in FIG. 10A, one monotone bit constituting the ADIP block is made up of 42 wobble unmodulated portions. As shown in FIG. 10B, one bit of the 4-bit ADIP bits constituting the ADIP block includes a 6-wobble ADIP unit including a modulation portion and a 36-wobble non-modulation portion.

  The 6-wobble ADIP unit including the modulation part includes first and second ADIP unit patterns.

  The ADIP bit ADIP unit corresponding to 1-bit digital data “1” of the address data in the address information is composed of the first ADIP unit pattern “101000”. The ADIP bit ADIP unit corresponding to 1-bit digital data “0” of the address data in the address information is composed of the second ADIP unit pattern “001010”.

  FIG. 11 shows address data and its error correction code. A 32-bit (= 8 nibble) error correction code (Parity) is added to 28-bit (= 7 nibble) address data. The breakdown of the 28-bit address data includes a 20-bit RUB number, a 2-bit RUB address number, information for a 2-bit multilayer disk, and 4-bit reserve. As the error correction method, a nibble-based Reed-Solomon code RS (15, 7, 9) is used.

  Next, address recording processing of the address recording apparatus will be described with reference to the flowchart of FIG.

  In step S <b> 1, the address generator 1 generates address information including a synchronization signal to be recorded on the optical disk 5, address data, and an error correction code of the address data, pre-encodes it, and outputs it to the modulator 3. At the same time, the carrier signal generation unit 2 generates a carrier signal carrying address information and outputs it to the modulation unit 3.

  In step S2, the modulation unit 3 MSK modulates the carrier signal input from the carrier signal generation unit 2 with the pre-encoded address information input from the address generation unit 1, and wobbles the obtained MSK modulation signal. Output to part 4.

  In step S <b> 3, the wobble forming unit 4 forms a groove on the optical disk 5 that is spirally wobbled according to the MSK modulation signal input from the modulation unit 3.

  As described above, according to the address recording process by the address recording apparatus, if any one of them can be detected, the position of the synchronization signal can be specified. It is possible to form the address information in the optical disc 5 by generating the address information and wobbling the groove corresponding to the MSK modulation signal corresponding to the address information.

  Thereby, it is possible to realize the optical disc 5 having very high address position detection accuracy. Therefore, it is not necessary to provide a useless area such as a link area in the data recording area, and the optical disc 5 that can effectively use the data recording area can be realized.

  Next, FIG. 13 shows a configuration example of an optical disc drive that records and reproduces arbitrary data on the optical disc 5 in which address information is recorded as a groove wobble by the address recording apparatus described above. .

  In the optical disc drive, the control circuit 21 controls each part of the optical disc drive based on a control program recorded on the recording medium 22. Specifically, each part of the optical disk drive is controlled in response to a recording command input from an external AV device or the like (not shown) via the AV interface 23, and corresponds to recording data input from the AV device or the like. The mark is recorded on the optical disk 5. In addition, in response to a playback command input from an external AV device or the like via the AV interface 23, each part of the optical disk drive is controlled to read a mark recorded on the optical disk 5 to reproduce recorded data. 23 to output to an external AV device or the like.

  The spindle circuit 24 controls the rotation of the spindle motor 26 based on a command from the control circuit 21. The servo circuit 25 seeks the optical pickup 27 to the address commanded from the control circuit 21 and, based on the focus error signal and tracking error signal input from the optical head circuit 28, the focus servo and tracking servo of the optical pickup 27. To control. The spindle motor 26 rotates the optical disc 5 based on the control from the spindle circuit 24.

  An optical pickup 27 including a laser output system, a reflected light receiving system, a biaxial actuator, and the like forms a mark by irradiating the optical disk 5 with laser light based on control from the optical head circuit 28 during recording. Further, the optical pickup 27 irradiates the optical disc 5 with laser light during recording and reproduction, receives the reflected light, generates a corresponding reflected light signal, and outputs it to the optical head circuit 28.

  At the time of recording, the optical head circuit 28 controls the laser output of the optical pickup 27 corresponding to the header signal input from the recording / reproducing circuit 29 or the binary signal subjected to recording compensation. The optical head circuit 28 generates an RF signal corresponding to embossed pits and marks recorded on the optical disc 5 based on the reflected light signal from the optical pickup 27 and outputs the RF signal to the recording / reproducing circuit 29 during reproduction. Further, the optical head circuit 28 generates a focus error signal and a tracking error signal based on the reflected light signal from the optical pickup 27 at the time of recording / reproduction, and outputs the focus error signal and the tracking error signal to the servo circuit 25, and a pp (push pull) signal. And output to the wobble circuit 32.

  Based on the control from the control circuit 21, the recording / reproducing circuit 29 records and compensates the binary signal from the modulation / demodulation circuit 30 and supplies it to the optical head circuit 28 during recording. Further, the recording / reproducing circuit 29 converts the RF signal from the optical head circuit 28 into binarized data and supplies it to the modem circuit 30 during reproduction.

  The modulation / demodulation circuit 30 modulates recording data with an error correction code input from the error correction circuit 31 and outputs the obtained binarized signal to the recording / reproducing circuit 29 based on the control from the control circuit 21. To do. Further, the modulation / demodulation circuit 30 demodulates the binarized signal from the recording / reproduction circuit 29 and outputs the obtained reproduction data to the error correction circuit 31 during reproduction.

  Based on the control from the control circuit 21, the error correction circuit 31 adds ECC (Error Correction Code) to recording data supplied from an external AV device or the like via the AV interface 23 during recording, thereby modulating / demodulating circuit 30. Output to. Further, the error correction circuit 31 corrects the error of the reproduction data input from the modulation / demodulation circuit 30 at the time of reproduction, and outputs it to an external AV device or the like via the AV interface 23.

  The wobble circuit 32 generates and demodulates a wobble signal (MSK modulation signal including a noise component) corresponding to the wobble of the groove based on the pp signal input from the optical head circuit 28, and obtains address information (synchronization signal). , Address data and error correction code) are output to an address decoder / timing generator (DEC / TG) 33.

  The address decoder / timing generator 33 detects the position of the sync part by detecting at least one of the four types of sync unit patterns included in the sync part from the address information input from the wobble circuit 32, An address is generated using the address data of the subsequent data part and its error correction code, and is output to the control circuit 21. The address decoder / timing generator 33 generates a timing signal based on the detected sync part and supplies it to each circuit of the optical disc drive via the control circuit 21.

  A process for restoring the address information by demodulating the wobble signal by the wobble circuit 32 will be described with reference to FIGS.

  First, a case where DMSK modulation is used as MSK modulation will be described. The address information which is the original data as shown in FIG. 14 (A) is converted into a signal as shown in FIG. 14 (B) by differential encoding as pre-encoding, and the signal shown in FIG. 14 (C) is obtained by MSK modulation. An MSK modulation signal (DMSK modulation signal) as shown in FIG.

  In the wobble circuit 32, a wobble signal (DMSK modulated signal including a noise component) is generated from the pp signal, and a carrier signal as shown in FIG. 14D is extracted therefrom. Further, in the wobble circuit 32, the wobble signal is multiplied by the carrier signal to generate a Demod out signal as shown in FIG. 14E, and the noise component is removed by a built-in low-pass filter or the like, and FIG. An LPF out signal as shown in F) is generated.

The coefficients of the low-pass filter (27 taps, FIR) built in the wobble circuit 32 are as follows. The sampling frequency is 8 times the wobble frequency.
-0.000640711
-0.000865006
0.001989255
0.009348803
0.020221675
0.03125
0.040826474
0.050034929
0.05852149
0.065960023
0.072064669
0.076600831
0.079394185
0.080337385, center
0.079394185
0.076600831
0.072064669
0.065960023
0.05852149
0.050034929
0.040826474
0.03125
0.020221675
0.009348803
0.001989255
-0.000865006
-0.000640711

  Further, in the wobble circuit 32, the LPF out signal is binarized to obtain Demod data as shown in FIG. 14G, which is NRZ-converted to obtain a signal (as shown in FIG. Pre-encoded address information data) is restored.

  Next, a case where GDMSK modulation is used as MSK modulation will be described. The address information, which is the original data as shown in FIG. 14A, is converted into a signal as shown in FIG. 15A by differential encoding as pre-encoding, and is transmitted through a Gaussian filter. Thus, the Mod data as shown in FIG. 15B is obtained, and further, the data is recorded on the optical disc 5 as the MSK modulation signal (GDMSK modulation signal) as shown in FIG. 15C by DMSK modulation.

  In the wobble circuit 32, a wobble signal (GDMSK modulation signal including a noise component) is generated from the pp signal, and a carrier signal as shown in FIG. 15D is extracted therefrom. Further, in the wobble circuit 32, the wobble signal is multiplied by the carrier signal to generate a demod out signal as shown in FIG. 15 (E), and the noise component is removed by a built-in low-pass filter or the like, and FIG. An LPF out signal as shown in F) is generated.

  Further, in the wobble circuit 32, the LPF out signal is binarized to obtain Demod data as shown in FIG. 15G, which is NRZ-converted to obtain a signal (as shown in FIG. Pre-encoded address information data) is restored.

  As described above, according to the optical disc drive, the position of the sync part can be detected by detecting at least one of the four types of sync unit patterns included in the sync part. As a result, the address data of the data part following the sync part and its error correction code can be acquired, and the address can be generated using them, so that the address error rate during recording and reproduction can be improved. In addition, any address on the optical disc 5 can be accessed quickly and accurately.

  Further, according to the present invention, the second signal of the MSK modulation signal has a frequency 1.5 times that of the first signal (carrier signal). The range is very narrow. Therefore, the reproduction bandwidth at the time of reproduction can be narrowed. Furthermore, the S / N can be improved, and the error rate of the address can be improved.

  It should be noted that the present invention can be applied to the case where address information is recorded not only on the optical disc 5 but also on all types of disc media and reproduced.

  The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a recording medium in a general-purpose personal computer or the like.

  As shown in FIG. 1, this recording medium is distributed to provide a program to a user separately from a computer, and includes a magnetic disk 8 (including a floppy disk) on which a program is recorded, an optical disk 9 (CD- It is not only composed of a package medium consisting of ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc)), magneto-optical disk 10 (including MD (Mini Disc)), or semiconductor memory 11 or the like. It is configured by a ROM, a hard disk or the like on which a program is recorded, which is provided to the user in a state of being pre-installed in the computer.

  In the present specification, the step of describing the program recorded in the recording medium is not limited to the processing performed in time series according to the described order, but is not necessarily performed in time series, either in parallel or individually. The process to be executed is also included.

  DESCRIPTION OF SYMBOLS 1 Address generation part, 2 Carrier signal generation part, 3 Modulation part, 4 Wobble formation part, 5 Optical disk, 6 Control part, 7 Drive, 8 Magnetic disk, 9 Optical disk, 10 Magneto-optical disk, 11 Semiconductor memory, 21 Control circuit, 22 recording media, 32 wobble circuits

Claims (3)

In a recording apparatus for reproducing an address of the disk medium based on a groove formed on the disk medium and recording recording data at the reproduced address,
Irradiating means for irradiating the disk medium with laser light;
Extracting means for receiving reflected light from the disk medium and extracting a reflected light signal corresponding to the groove;
Reproducing means for reproducing address information based on the extracted reflected light signal,
The address information recorded as a groove wobble formed on the disk medium is:
It consists of 83 units ADIP units,
The integral multiple of the 83 units ADIP units is a size corresponding to one recording unit block of the disk medium,
The address information includes 2-bit data indicating a RUB address number for distinguishing a plurality of ADIP units in one recording unit block,
The 83 units ADIP units consist of an 8 units synchronization part and a 75 units data part.
The data unit, the recording device constituted by 15 blocks the 5 bits as one block including an ADIP bits 4 bits. In a reproducing apparatus for reproducing the address of the disk medium based on the groove formed on the disk medium,
Irradiating means for irradiating the disk medium with laser light;
Extracting means for receiving reflected light from the disk medium and extracting a reflected light signal corresponding to the groove;
Reproducing means for reproducing address information based on the extracted reflected light signal,
The address information recorded as a groove wobble formed on the disk medium is:
It consists of 83 units ADIP units,
The integral multiple of the 83 units ADIP units is a size corresponding to one recording unit block of the disk medium,
The address information includes 2-bit data indicating a RUB address number for distinguishing a plurality of ADIP units in one recording unit block,
The 83 units ADIP units consist of an 8 units synchronization part and a 75 units data part.
The data unit is a playback device configured by 15 blocks each including 5 bits including 4 ADIP bits. A spiral and wobbling groove corresponding to the MSK modulation signal corresponding to the address information is formed,
The address information is
It consists of 83 units ADIP units,
The integer multiple of 83 units ADIP units is a size corresponding to the recording unit block of the disk medium,
The address information includes 2-bit data indicating a RUB address number for distinguishing a plurality of ADIP units in one recording unit block,
The 83 units ADIP units consist of an 8 units synchronization part and a 75 units data part.
The data unit, the disk medium composed of 15 blocks the 5 bits as one block including an ADIP bits 4 bits.

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