JPH10320784A - Optical disk, optical disk device and optical disk reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an additional circuit for reproducing control information by detecting address information and control information independently from the wobble signal of an optical disk to enable the control information to be reproduced with the same reproducing means as that of the wobble signal. SOLUTION: Channel data is supplied from a wobble signal decoding circuit to an 8-bit shift register 56. A CTM comparator circuit 58 outputs a CTM detection signal to a system controller when the channel data coincide with CTM(control track mark) data. A synchronization detecting circuit synchronizes ADIP (address information) data and parameter information with respect to the wobble signal subjected to a biphase modulation by detecting SYNC data being independent codes and the CTM data. Then, the ADIP data and data of a control track area can be detected by being separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk including a magneto-optical disk and the like, a device therefor, and a reproducing method, and more particularly to an optical disk having a meandering guide groove for providing a wobble signal, an optical disk device and an optical disk reproducing method. .

[0002]

2. Description of the Related Art Conventionally, as an optical disk, a read-only R
Recordable RAM disk such as OM disk, write-once disk, magneto-optical (MO) disk, ROM area and RAM
A so-called partial ROM disk having an area is known.

In such an optical disc, in order to obtain servo information at the time of reproduction, a so-called wobble for forming a guide groove on a track on which data is recorded and meandering the guide groove at a constant frequency is used. (Hereinafter, forming a guide groove in a track of an optical disc and meandering the guide groove at a constant frequency is referred to as wobbling the track.) In an optical disk system that handles such an optical disk, a so-called wobble signal, which is a signal of a change in the intensity of light reflected from a land or groove meandering at a constant frequency, is detected, and the disk is changed so that the change has a predetermined frequency. Control. Also, in such an optical disk in which a track is wobbled, predetermined data is frequency-modulated using the meandering frequency of the track, that is, the frequency of the wobble signal as a carrier wave, and address information (ADIP) is set in each track.

In order to synchronize recording data, a predetermined number of clock marks are inserted in one sector. That is, synchronization is achieved by inserting a high-frequency wave with respect to the frequency of the wobble signal at predetermined intervals, detecting this clock mark, and applying a PLL to these intervals.

[0005] In this way, by wobbling a track of an optical disk and inserting a clock mark into the wobble, for example, a prepit or the like used in a sample servo system or the like provided continuously or discretely along the track. Need not be formed.

[0006] Conventionally, in optical discs, ISO M
It is known to provide a PEP (Phase Encoded Part) area indicating the parameters of a disc on the inner periphery or outer periphery as in the 5.25-inch standard. In the PEP, parameter information is described using a difference in reflectance depending on the presence or absence of a pit having a barcode shape. In an optical disk system that handles optical disks, P
The controller reads parameter information described in the EP, reads control information from a control track based on the parameter information, and performs a control operation according to the control information.

[0007]

Here, it is conceivable that a parameter information is described by providing a PEP on the inner or outer peripheral portion of the optical disk with respect to the above-described optical disk having the track wobbled.

However, if a PEP is provided on an optical disk in which such a track is wobbled, a detection circuit for detecting the PEP must be provided separately from a wobble signal in an optical disk system that handles this optical disk. Also, when molding optical discs,
Prepits must be provided on the control track, and by wobbling the track of the optical disc, the advantage that it is not necessary to form a prepit or the like used in the conventional optical disc is eliminated.

The present invention has been made in view of the above circumstances, and an optical disc in which parameter information of a disc is described without providing a PEP on an optical disc on which a meandering track for providing a wobble signal is formed. It is an object to provide an optical disk device and an optical disk reproducing method.

[0010]

In order to solve the above-mentioned problems, an optical disk according to the present invention responds to a wobble signal including address information having independent synchronization data and control information indicating disk parameters. A meandering guide groove is formed.

In this optical disc, address information and control information are independently detected from the wobble signal.

Further, in the optical disk device according to the present invention, a meandering guide groove for providing a wobble signal is formed, and the wobble signal includes address information having independent synchronization data and control information indicating disk parameters. Reproducing means for reproducing the wobble signal from the contained optical disc; synchronous data detecting means for detecting synchronous data from the wobble signal; and a wobble signal reproduced based on the synchronous data detected by the synchronous data detecting means. And wobble signal determining means for determining whether the information is address information or control information.

In this optical disk device, address information and control information are independently detected from a wobble signal of the optical disk.

Further, according to the optical disk reproducing method of the present invention, a meandering guide groove for providing a wobble signal is formed.
The wobble signal is reproduced from an optical disc containing address information having independent synchronization data and control information indicating disc parameters, and the synchronization data is detected from the wobble signal. It is characterized in that it is determined whether the reproduced wobble signal is address information or control information based on the synchronization data.

In this optical disk reproducing method, address information and control information are independently detected from a wobble signal of the optical disk.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disc according to an embodiment of the present invention will be described with reference to the drawings. The optical disk according to the present embodiment will be described by taking a magneto-optical disk capable of recording and reproduction as an example. The optical disk according to the present embodiment has a single-sided wobble in which wobble is applied only to one side wall of a track so that address information can be obtained when data is recorded in both the land and the groove. The description will be made by taking the magneto-optical disk as an example.

FIG. 1 is a diagram for explaining a wobble signal given from a track of an optical disc according to an embodiment of the present invention. 1A shows channel data, FIG. 1B shows a wobble signal corresponding to the channel data, and FIG. 1C shows a schematic shape of a track.

The wobble signal of the optical disk is shown in FIG.
As shown in (1), a frequency modulation of ± d [Hz] is performed on a carrier of n [Hz]. This wobble signal is shown in FIG.
As shown in (a), when the channel data is 1, the frequency is n [Hz] + d [Hz], and when the channel data is 0, the frequency is n [Hz] -d [Hz]. The wobble signal is, for example, a signal of about 3.5 waves per channel. The wobbled track has a meandering shape corresponding to the wobble signal, as shown in FIG.

FIG. 2 shows a disk image of the optical disk of the present embodiment. On this optical disk, tracks 0 to n are formed spirally from the inner side toward the outer side, and each track has 0 in the circumferential direction.
Ｍm sectors are included.

In this optical disk, control track areas are provided on the outermost and innermost sides of the disk, and a user area, a test area, and a PDL (Primary Defect LDL) are provided between the control track areas.
ist) and an SDL (Secondly Defect List) area.

Each track such as the control track area and the user area is subjected to the wobble described above.
The parameter information of the disc is described in the wobble signal in the control track area. Address information (ADIP) is described in the user area, test area, PDL, and SDL area.

FIG. 3 is a diagram for explaining a format of data included in a wobble signal of the optical disc according to the embodiment of the present invention.

As shown in FIG. 3A, groove portions G and land portions L are formed alternately in the radial direction on this optical disc, and data is recorded in both the groove portions G and the land portions L. . A wobble is applied to a wall of a track on one side of the groove portion G in accordance with channel data obtained by bi-phase (ByPhase) modulation of parameter information and address information. In this case, the channel data is frequency-modulated (FM), and the groove portion G is wobbled so as to correspond to the modulated signal. That is, the modulated signal is recorded as a wobble signal. Since the track wall on one side of the groove portion G is wobbled, the wall on one side of the land portion L is also wobbled in accordance with the channel data.

The wobble signal of this optical disk is composed of one wobble address frame (Wobble Address frame) in one sector unit.
Frame). This one wobble address frame includes parameter information and address information (ADI).
P) is bi-phase modulated and describes 48-bit data in channel data.

User area (test area, PDL and SD)
(L area), one wobble address frame
As shown in (b), the first four bits include a servo synchronization signal Sync serving as a synchronization signal of the user area, and the next 24 bits.
The bits include a frame address (Frame Address) serving as the address of this sector, the next 6 bits include reserved data RSVD serving as a reserved area, and the last 14 bits include an error correction code (CRC).

In the control track area, as shown in FIG. 3C, a control track mark CTM serving as a synchronization signal of the control area is provided in the first 4 bits, and parameter information of the disk is provided in the next 24 bits. Control code and the next 6
The page code (Page) serving as the page number of the control code and the reserved data RSVD serving as the reserved area are set in bits, and the error correction code (C) is set in the last 14 bits.
RC).

As shown in FIG. 3D, one sector is composed of, for example, 24 segments. At the boundary position of each segment, as shown in FIG. 3A, a clock mark CM is multiplexed into wobbles and preformatted. As shown in FIG. 3E, a 100-byte data area is provided in each segment, and a 10-byte fixed pattern area is provided corresponding to the boundary position of each segment. When writing data, NRZI data is recorded in the data area,
In the fixed pattern area, a 2T fixed pattern signal synchronized with the NRZI data is recorded (T is a data bit interval).

Here, in the above-mentioned user area, each data except for the servo synchronization signal Sync is data of the bi-phase (BiPhase) method as described above. On the other hand, the servo synchronization signal Sync, which is a synchronization signal for the user area, has a 3T pattern, which is a pattern independent of other data patterns. Specifically, the data pattern of this user area is, for example, as shown in FIG.
., And the channel data is "11001100101101..."
The data pattern in the control track area is, for example, a 3T pattern in which the channel data is "00010111" as shown in FIG. The synchronization signal and the channel data are “0011001”.
"1010010 ..."
And the frame address of "".

That is, since the 3T pattern is independent of the biphase method, the wobble address frame can be synchronized when the optical disc is reproduced.

In the control track area, each data except for the control track mark CTM is data of a BiPhase system. On the other hand, the control track mark CTM which is a synchronization signal of the control track area is a 4T pattern which is a pattern independent of other data patterns. Specifically, the data pattern in the control track area is, for example, as shown in FIG.
A 4T pattern synchronization signal whose channel data is “11110000” and a channel data of “11001”
"100101101..."
The data pattern of the control track area is, for example, as shown in FIG. 5B, a 4T pattern synchronization signal with channel data of "000011111". And the channel data is "00110011010001
.., "0000101...".

That is, since the 4T pattern is a pattern independent of the bi-phase system, the wobble address frame can be synchronized when the optical disc is reproduced.

The control track mark C
Since the TM data pattern is a 4T data pattern, it is also independent of the 3T pattern of the servo synchronization signal Sync described above. Therefore, the control track mark CTM synchronizes the wobble address frame and the servo synchronization signal Syn.
c can be distinguished from data.

The 24-bit control code in the control track area includes, as disc parameter information, for example, media generation information, media vendor information, and disc recording / reproduction characteristic information (MA).
X.read power MAX.write power etc), format information (zone-related information), and the like.
As described above, the optical disk of this embodiment can include the address information and the parameter information of the disk in the wobble signal, eliminating the need to form control information in another format such as pre-pits. Becomes easier.

The optical disk of the present invention can be used not only for reproduction but also for recording and reproduction.
Of course, it may be a magneto-optical disk.

Next, a description will be given of an optical disk apparatus according to an embodiment to which the present invention is applied, which handles the optical disk of the above-described embodiment. The optical disk device of this embodiment records or reproduces data on an optical disk or performs recording and reproduction, and in particular, performs magneto-optical recording when recording. In describing the optical disk device, the optical disk of the above-described embodiment, which is a medium handled by the optical disk device, is simply referred to as a disk D.
Called.

FIG. 6 is a block diagram of an optical disk device according to an embodiment of the present invention.

The optical disk device 1 has a disk turntable 2 on which a disk D is loaded, a spindle motor 3 for driving the disk turntable 2 to rotate, writing data on the disk D, and reading data from the disk D. A pickup 4 and an RF amplifier 11 are provided.

The optical disk device 1 includes an RF processor 12 for binarizing an MO signal as a reproduction signal and a decoder 1 for performing error correction processing on the binarized MO signal.
3, a focus driver 14 and a tracking driver 15 for supplying drive signals to the two-axis mechanism 6, and a spindle motor driver 16 for driving the spindle motor 2.

The optical disk apparatus 1 further includes an encoder 21 for adding an error correction code or the like to a recording signal to be recorded on the disk D and performing a modulation process or the like, and a recording magnetic field for recording data on the disk D. A magnetic head 24, a magnetic head driver 23 that drives the magnetic head 24 based on a recording signal to which an error correction code or the like is added by the encoder 21, and a laser driver 22 that drives a laser diode that emits a laser beam to the disk D.
With.

The optical disk drive 1 supplies a control signal to the focus driver 14, the tracking driver 15, the spindle driver 16, the laser driver 22, and the like to control each servo loop.
Controls the entire optical disc device 1 and
For example, it includes a system controller 10 for exchanging data with a host computer. A disk D handled by the optical disk device 1 is loaded on a disk turntable 2 and is driven to rotate at a constant linear velocity (CLV) or a constant angular velocity (CAV) by a spindle motor 3 during reproduction and recording operations. The spindle motor 3 is a spindle motor driver 1
6 driven.

The pickup 4 includes an objective lens 5, a biaxial mechanism 6, a laser diode 7, a photodetector 8, and the like. The objective lens 2 is held by a biaxial mechanism 6 so as to be movable in a tracking direction and a focus direction. The two-axis mechanism 6 is driven by a focus driver 14 and a tracking driver 15.
The laser diode 7 emits a laser beam to the disk D. The laser diode 7 is controlled by a laser driver 22 described later. The information on the reflected light from the disk D is detected by the photodetector 8 and is supplied to the RF amplifier 11 as a current signal corresponding to the amount of received light.

The RF amplifier 11 includes a current-voltage conversion circuit, an amplification circuit, a matrix operation circuit, and the like, and generates a necessary signal based on a current signal from the photodetector 8.
For example, an MO signal as reproduction data, a focus error signal FE for servo control, and a push-pull signal PP as a tracking error signal are generated.

The MO signal generated by the RF amplifier 11 is R
The focus error signal FE and the push-pull signal PP are supplied to the servo processor 20, the push-pull signal PP is supplied to the ADIP decoder, and the focus error signal FE and the push-pull signal PP are supplied to the system controller 10.

The RF processor 12 converts the supplied MO signal based on the control signal of the system controller 10 into
Binarization, so-called EFM signal (8-14 modulated signal; C
D) or EFM + signal (8-16 modulated signal;
(For a DVD) and supplies it to the decoder 13.

The decoder 13 performs EFM demodulation, CIRC decoding, and the like on the MO signal binarized by the RF processor 12, and performs MPEG decoding and the like as necessary, to process information read from the disk D. Playback is performed and supplied to the system controller 10.

On the other hand, the servo processor 20 is supplied with the focus error signal FE and the push-pull signal PP from the RF amplifier 11, and performs focus, tracking,
It generates various servo drive signals for the spindle and executes the servo operation.

That is, the servo processor 20 generates a focus control signal based on the focus error signal FE, and supplies the focus control signal to the focus driver 14 so that the laser light is focused on each signal surface of the disk D. To control.

The servo processor 20 generates a tracking control signal based on the push-pull signal PP, and supplies the tracking control signal to the tracking driver 15 so that the laser beam is just tracked on the track on each signal surface of the disk D. Is controlled so that

Further, the servo processor 20 has, for example,
A spindle control signal is generated in accordance with a spindle error signal that has detected the rotation speed of the disk D, and the spindle drive signal is supplied to a spindle motor driver 16 to control the rotation speed of the disk D.

The servo processor 20 generates a laser drive signal for performing a process for keeping the light amount of the laser diode 7 irradiating the disk D constant based on the light amount detection signal of the laser diode 7. The drive signal is supplied to the laser driver 22.

The servo processor 20 operates under the control of the system controller 10, and for example,
Control such as the start of the pull-in operation of the focus loop is performed. The encoder 21 encodes the recording data to be recorded on the disk D by performing CIRC encoding or the like on the recording data supplied from the system controller 10 and performing MPEG encoding or the like as necessary.
The encoded recording data is modulated to generate a so-called EFM signal (8-14 modulated signal; in the case of CD) or an EFM + signal (8-16 modulated signal; in the case of DVD). The encoder 21 transmits the encoded recording data subjected to a predetermined modulation to the magnetic head driver 1.
Supply 3

The magnetic head driver 23 includes the encoder 2
1 based on the recording data supplied from
To apply a modulation magnetic field to the disk D during recording. That is, the disk D is subjected to magnetic field modulation together with the laser emitted from the laser diode 7,
The data is recorded.

In the optical disk device 1, in the case of the magnetic field modulation recording, the laser only irradiates a pulse at a constant interval, and thus has no relation to the encoded data. However, in the case of optical modulation recording, an optical pulse is modulated with data. Therefore, in the case of this light modulation recording, the magnetic field is not controlled.

Next, an ADIP decoder that decodes a wobble signal given from the track of the disk D and detects address data and the like given from the wobble signal will be described.

The optical disk device 1 includes an RF amplifier 11
Supplies a push-pull signal PP, decodes a wobble signal given from a track of the disk D,
An ADIP decoder 30 that generates data and supplies the data to the system controller 10 is provided.

As shown in FIG. 7, the ADIP decoder 30 is supplied with a push-pull signal PP, demodulates a wobble signal from the push-pull signal PP, and modulates the address data (ADIP data) and the parameter information before bi-phase modulation. A wobble signal demodulation circuit 31 for generating the channel data and its clock, and a synchronization signal which is the first 4-bit data of the wobble address frame is detected based on the channel data generated by the wobble signal demodulation circuit 31 and the clock signal. Synchronous detection circuit 3
And 2.

As shown in FIG. 8, the wobble signal demodulation circuit 31 includes a buffer 41 to which a push-pull signal is supplied.
, A band-pass filter 42, a phase comparator 43, a low-pass filter 44, a voltage-controlled oscillator (VCO) 45 constituting a PLL circuit, a low-pass filter 46, a comparator 47, and a flip-flop 48.

The wobble signal demodulation circuit 31 includes a delay circuit 49 for delaying channel data from the comparator 47 for a predetermined time, an EX-OR circuit 50, a monomultivibrator 51, and a phase comparator 52 constituting a PLL circuit. , VCO 53, and a low-pass filter 54.

The buffer 41 is supplied with the push-pull signal PP from the RF amplifier 11, and the buffer 41 supplies the push-pull signal PP to the band-pass filter 42.

The band-pass filter 42 filters only a predetermined frequency of the push-pull signal PP, and outputs a frequency-modulated wobble signal that passes only a predetermined frequency component. The wobble signal output from the band pass filter 42 is supplied to a phase comparator 43.

The phase comparator 43 has a low-pass filter 44
And a VCO 45 to form a loop circuit to generate a carrier clock of the frequency-modulated wobble signal, and to output a phase difference signal between the carrier clock of the wobble signal and the wobble signal.

The phase difference signal is supplied to a low-pass filter 46.
The high frequency component is cut by the comparator 47, and is binarized by the comparator 47. This binarized signal is used for address data (ADI
P data) and channel data obtained by bi-phase modulation of parameter information and the like. The EX-OR circuit 50
Are supplied with the channel data binarized by the comparator 47 and a signal obtained by delaying the channel data by a delay circuit 49 for a predetermined time. EX-OR circuit 50
Calculates the exclusive OR of these signals to detect the edge component of the channel data.

The edge component of the channel data is passed through a monomultivibrator 51 to a phase comparator 52 and V
PLL composed of CO53 and low-pass filter 54
The clock signal of the channel data is reproduced by the PLL circuit.

The channel data and the clock signal of the channel data are supplied to the flip-flop 48, respectively, and the channel data synchronized with the clock signal is output from the wobble signal demodulation circuit 30.

The wobble signal demodulation circuit 31
It also has a wobble signal demodulation circuit in which the pass band of the band-pass filter 42 provided in the input stage is changed,
The clock mark inserted in the wobble signal is reproduced based on this circuit.

As shown in FIG. 9, the synchronization detection circuit 32
8-bit shift register 56 to which channel data is supplied, a SYNC comparison circuit 57, and a CTM comparison circuit 58
And

The 8-bit shift register 56 is supplied with channel data from the wobble signal demodulation circuit 31. The 8-bit shift register 56 stores the channel data for 8 bits and sequentially sends out the data in synchronization with the synchronization clock.

The SYNC comparison circuit 57 detects the 8-bit channel data stored in the 8-bit shift register 56 as parallel data, and uses the detected data as 8-bit SYNC data "11110000" which is synchronization data of the user area. "And" 000011111 ".

The SYNC comparison circuit 57 supplies a SYNC detection signal to the system controller 10 when the channel data matches the SYNC data.

The CTM comparing circuit 58 detects the 8-bit channel data stored in the 8-bit shift register 56 as parallel data, and converts the detected data into 8-bit data before bi-phase modulation, which is synchronous data of the control track area. Bit control data "1110
1000 "and" 00010111 ".

The CTM comparing circuit 58 supplies a CTM detection signal to the system controller 10 when the channel data matches the CTM data.

That is, the synchronization detecting circuit 32 can synchronize ADIP data and parameter information by detecting SYNC data and CTM data, which are independent codes, with respect to the wobble signal subjected to the biphase modulation. it can. In particular, since different codes are set in the disc D in the user area and the control track area, ADIP data in the user area and data in the control track area can be detected separately.

Next, the content of the process of detecting and reading the wobble signal in the control track area of the disc D when the optical disc apparatus 1 starts reproduction or recording will be described with reference to the flowchart of FIG.
Note that the processing described below is performed by the system controller 10 of the optical disk device 1 controlling each circuit.

When the disk D is loaded on the disk turntable 2, the system controller 10 of the optical disk device 1 starts the processing from step S1.

When the disk D is loaded, the optical disk apparatus 1 seeks the pickup 4 to the outermost or innermost side of the disk D (step S1), then pulls in the focus loop and applies the focus servo (step S1). S2). When the focus loop is retracted, the optical disk device 1 subsequently applies tracking servo, applies this tracking servo, and reproduces ADIP data, parameter information, and a clock mark by the wobble demodulation circuit 31 of the ADIP decoder 30 (step S3). ).

Subsequently, the optical disk device 1 detects a synchronization signal from the channel data of the reproduced wobble signal,
It is determined whether or not CTM synchronization data has been detected (step S4). That is, the CT of the synchronization detection circuit 32
It is determined whether a CTM detection signal has been detected from M comparison circuit 58.

If the CTM synchronization data cannot be detected,
After seeking again to the outer or inner circumference side (step S
5) Repeat the determination as to whether or not CTM synchronization data has been detected (step S4).

If the synchronous data of CTM can be detected, the control code is read (step S).
6) Various settings are made based on media generation information, media vendor information, disc recording / reproduction characteristic information, format information, etc. included in the control code (step S7), and recording or reproduction processing is started.

As described above, in the optical disk device 1, data including the parameter information of the control track area can be reproduced by the decoder of the normal wobble address, and can be reproduced without providing an additional circuit.

[0080]

According to the optical disk of the present invention, since the address information and the control information are independently detected from the wobble signal, it is not necessary to form the control information in another format such as a pre-pit. It's easy.

In the optical disk apparatus according to the present invention, by independently detecting the address information and the control information from the wobble signal of the optical disk, the control information can be reproduced by the same reproducing means as the wobble signal reproducing means.
It is not necessary to provide an additional circuit for reproducing the control information.

In the optical disk reproducing method according to the present invention, by independently detecting the address information and the control information from the wobble signal of the optical disk, the control information can be reproduced in the same reproduction step as the reproduction step of the wobble signal. It is not necessary to provide an additional step for reproducing information.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a wobble signal given from a track of an optical disc according to an embodiment of the present invention.

FIG. 2 is a diagram showing a disk image of the optical disk of the embodiment according to the present invention.

FIG. 3 is a diagram illustrating a format of data included in a wobble signal of the optical disc according to the embodiment of the present invention.

FIG. 4 is a timing chart illustrating a servo synchronization signal SYNC which is a synchronization signal of a user area of the optical disc according to the embodiment of the present invention.

FIG. 5 is a timing chart illustrating a control track mark CTM which is a synchronization signal of a control track area of the optical disc according to the embodiment of the present invention.

FIG. 6 is a block diagram of an optical disk device according to an embodiment of the present invention.

FIG. 7 illustrates an optical disk device according to an embodiment of the present invention.
It is a block diagram of a DIP decoder.

FIG. 8 is a block diagram of a wobble signal demodulation circuit of the ADIP decoder.

FIG. 9 is a block diagram of a synchronization detection circuit of the ADIP decoder.

FIG. 10 is a flowchart illustrating a process of detecting synchronous data of a wobble signal by the optical disc device according to the embodiment of the present invention.

[Explanation of symbols]

1 optical disk device, 2 disk turntable, 3
Spindle motor, 4 pickup, 10 system controller, 11 RF amplifier, 12 RF processor, 13 decoder, 14 focus driver, 1
5 tracking driver, 16 spindle driver, 20 servo processor, 21 encoder, 22
Laser driver, 23 Magnetic head driver, 25
Magnetic head, 30 ADIP decoder, 31 wobble signal demodulation circuit, 32 synchronization detection circuit

Claims (3)

[Claims] 1. An optical disk having a meandering guide groove corresponding to a wobble signal including address information having independent synchronization data and control information indicating disk parameters. 2. A wobble guide groove for providing a wobble signal is formed. The wobble signal contains address information having independent synchronization data and control information indicating parameters of the disk.
Reproducing means for reproducing the wobble signal; synchronous data detecting means for detecting synchronous data from the wobble signal; and controlling whether the reproduced wobble signal is address information based on the synchronous data detected by the synchronous data detecting means. An optical disc device comprising: a wobble signal discriminating means for discriminating whether the information is information. 3. A wobble guide groove for providing a wobble signal is formed. The wobble signal includes address information having independent synchronization data and control information indicating parameters of the disk.
Reproducing the wobble signal; detecting synchronization data from the wobble signal; and determining whether the reproduced wobble signal is address information or control information based on the detected synchronization data. Method.