JP2002216346A - Disk drive device and address acquisition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up address acquisition processing. SOLUTION: Two kinds of addresses present about an address acquired from a groove as an absolute time in pregroove(ATIP), and an address acquired by being recorded with data as a sub-code. When the address can be acquired from either of these, data recording is done to the last without relating to whether time table of contents(TOC) is recorded. When the address (sub-code address) is acquired from the read out data, priority is given to the address acquisition. Then, when it is not possible, for example, only when the address extraction from the non-recorded area of the data or the data is not completed, the address acquisition from the groove is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, a CD-RW
(Compact Disc Rewritable), CD-R (Compact Disc
The present invention relates to a disk drive device for a recording medium on which data can be recorded, such as Recordable, and an address acquisition method.

[0002]

2. Description of the Related Art For example, CD-DA (Compact Disc-Digital Audio), C
D-ROM, CD-R (CD-RECORDABLE), CD-RW
(CD-REWRITABLE), CD-TEXT, so-called CD
Various discs belonging to the family have been developed and spread. CD-DA and CD-ROM are read-only media. On the other hand, a CD-R is a write-once medium using an organic dye for a recording layer, and a CD-RW
Is a data rewritable medium using a phase change technology.

As is well known, data such as music, video, computer data, and the like are recorded on such a CD-format disc, and track numbers, indexes, addresses, and the like are recorded as subcodes. The track number is, for example, a number given in units (tracks) of music or the like. The index is a unit that divides a track into smaller pieces. For example, it is a unit that separates movements in music. As the address, an absolute address as a continuous value over the entire disk or a relative address given in units of tracks (also called programs; for example, one music unit in the case of music data) is recorded. Thus, at each position on the disk, an absolute address (absolute address) and a relative address can be recognized by extracting the subcode. The address is expressed by a time value of, for example, minute / second / frame. Therefore, in the CD format, for example, the expression "absolute time" corresponds to "absolute address", and "time" is often synonymous with "position (address)".

On the innermost side of the disk, so-called TOC information is constituted by subcode information, and management information such as the head of each track and an address indicating an area is described. By reading this TOC, the disk drive device can obtain information on tracks recorded on the disk. In the case of a CD-R or CD-RW, TOC information is recorded on a disc at a predetermined time, such as when a series of data writing by a predetermined recording method is completed.

Further, in the case of a recordable disc such as a CD-R or CD-RW, a recording track is formed by a groove (groove), and the groove is wobbling. The wobbling waveform corresponds to a waveform modulated based on the absolute address information. Therefore, the absolute address and the like are expressed from the wobbling of the groove. This absolute address is A
It is called TIP (Absolute Time In Pregroove). Since the sub-code is not recorded on the disk before recording, the address information is read from the wobbling groove during the recording operation.

[0006]

However, CD-R, C
In a process in which a disk drive corresponding to the D-RW acquires an address from a disk, a processing method is determined according to the state of the loaded disk. That is, FIG.
As shown in FIG. 5, the loaded disc is recognized (F201), and if the disc has already recorded TOC information, the address is obtained from the subcode (F202 → F203). On the other hand, T
If OC is not recorded, ATI from groove
The address by P is obtained (F202
→ F204).

When such an address acquisition method is used,
For example, even if data is already written on most of the disc and at the same time the address information of that part can be extracted from the subcode, if the TOC information has not yet been recorded, the address as the ATIP Was to be extracted.

Here, as a circuit configuration of a disk drive device corresponding to CD-R and CD-RW, a wide PLL is often used for a reproduction circuit of data including a subcode, and the influence of the rotation control of the disk. The data can be read at high speed without receiving the data. On the other hand, as a circuit system for reading the ATIP from the groove information, there are many circuits which cannot read the ATIP unless the disk rotation speed is locked in a range satisfying a certain prescribed linear velocity. ATIP requires longer time to read than subcode. For example, FIG. 16 shows the timing at which the address can be read after the optical pickup is moved from the inner circumference to the outer circumference of the disk. As shown in the figure, the subcode is ts after the movement of the optical pickup is completed. At that time, the ATIP becomes readable at a time ta after a required rotation control period.
The reading of the IP is delayed by a time difference Δt from the reading of the subcode.

According to the address acquisition method as shown in FIG. 15, even if the disk has a readable subcode, if the TOC is not recorded, the address is acquired only by the ATIP. However, there is a disadvantage that the time required for reading the entire data becomes longer due to the need to wait for the rotation control.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made to promote quick address acquisition in a disk drive apparatus compatible with a disk recording medium such as a CD-R or a CD-RW. With the goal.

For this purpose, a recording track is formed by a groove on which address information is recorded, and a laser beam is radiated in a disk drive device on a disk recording medium on which data is recorded in a recording data format including the address information. Recording / reproducing head means for performing recording / reproducing scanning of data on a disk recording medium, and detecting the presence / absence of a pit at the scanning position of the recording / reproducing head means to determine whether or not the scanning position of the recording / reproducing head means has data recorded Determining means for determining whether
First address extracting means for extracting address information from data read from a disk recording medium by the recording / reproducing head means, and address information extracting from information obtained from a groove of the disk recording medium by the recording / reproducing head means When it is determined that the data has been recorded by the second address extracting means and the discriminating means, the address information is acquired by the first address extracting means, and when it is judged that the data has not been recorded by the discriminating means. Is
Address acquisition means for acquiring address information by the second address extraction means. In the address acquisition method according to the present invention, the presence or absence of a pit at the scanning position of the reproducing head is used to determine whether or not the scanning position has data recorded, and to determine that the scanning position is a data recorded area. If it is determined that the scanning position is not the data recorded area, the address information is extracted from the data read from the disk recording medium by the reproducing head. The address information is extracted from the information obtained from the groove of the medium.

Further, according to the present invention, in a disk drive device for a disk recording medium on which a recording track is formed by a groove on which address information is recorded and data is recorded in a recording data format including the address information, a laser beam irradiation is performed. Recording / reproducing head means for performing recording / reproducing scanning of data on / from the disk recording medium, a first address extracting means for extracting address information from data read from the disk recording medium by the recording / reproducing head means, Second address extracting means for extracting address information from information obtained from the groove of the disk recording medium by the recording / reproducing head means, and first obtaining the address information by the first address extracting means; Address by address extraction means If the obtained could not be, the second
Address acquisition means for attempting to acquire address information by the address extraction means. Further, according to the address acquisition method of the present invention, first, an address information acquisition process is performed from data read from a disk recording medium by a reproduction head, and if the address information cannot be acquired, the disk recording is subsequently performed by the reproduction head. An address information acquisition process is performed from information obtained from the groove of the medium.

That is, in the present invention, for example, an address obtained from a groove, such as ATIP, and an address obtained by being recorded together with data, such as a subcode, are recorded to the last. If a code address is obtained, priority is given to obtaining the address. Then, only when it is not possible, for example, in the area where no data is recorded or when the address cannot be extracted from the data, the address is obtained from the groove.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a disk drive corresponding to a CD-R and a CD-RW will be described as an embodiment of the present invention. The description will be made in the following order. 1. 1. Configuration of disk drive device 2. Disk structure and ATIP 3. Subcode and TOC Address acquisition processing

1. Configuration of Disk Drive Apparatus CD-R is a write-once medium using an organic dye for a recording layer, and CD-RW is a data rewritable medium using a phase change technique. CD-
FIG. 1 shows a configuration of a disk drive device of the present example capable of recording and reproducing data on a CD type disk such as R, CD-RW or the like. In FIG. 1, the disk 90 is a CD-R or a CD-RW. CD-D
A (CD-Digital Audio), CD-ROM, and the like can also be reproduced as the disc 90 here.

The disk 90 is loaded on the turntable 7, and is driven by the spindle motor 1 during recording / reproducing operation at a constant linear velocity (CLV) or a constant angular velocity (CA).
V). Then, the optical pickup 1 reads out pit data (pits due to phase change pits or organic dye change (reflectance change)) on the disk 90. In the case of a CD-DA or a CD-ROM, the pits are embossed pits.

In the pickup 1, a laser diode 4 as a laser light source, a photodetector 5 for detecting reflected light, an objective lens 2 as an output end of the laser light,
An optical system (not shown) for irradiating the laser beam to the disk recording surface via the objective lens 2 and guiding the reflected light to the photodetector 5 is formed. A monitor detector 22 that receives a part of the output light from the laser diode 4
Is also provided.

The objective lens 2 is held by a biaxial mechanism 3 so as to be movable in a tracking direction and a focus direction. The entire pickup 1 can be moved in the disk radial direction by a thread mechanism 8. The laser diode 4 in the pickup 1 is driven to emit laser light by a drive signal (drive current) from a laser driver 18.

The information on the reflected light from the disk 90 is detected by the photodetector 5, converted into an electric signal corresponding to the amount of received light, and supplied to the RF amplifier 9. Before and after recording data on the disk 90, during recording, and the like, the amount of reflected light from the disk 90 varies more greatly than in the case of a CD-ROM.
An AGC circuit is generally mounted on the RF amplifier 9 due to the fact that it is greatly different from a D-ROM and a CD-R.

The RF amplifier 9 includes a current-voltage conversion circuit, a matrix operation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as the photodetector 5, and generates necessary signals by matrix operation processing. For example, it generates an RF signal as reproduction data, a focus error signal FE for servo control, a tracking error signal TE, and the like. The reproduction RF signal output from the RF amplifier 9 is supplied to the binarization circuit 11 and the pit detection unit 24, and the focus error signal FE and the tracking error signal TE are supplied to the servo processor 14.

On the disc 90 as a CD-R or CD-RW, a groove (groove) serving as a guide for a recording track is formed in advance, and the groove contains time information indicating an absolute address on the disc. The signal is wobbled (meandering) by the FM-modulated signal. Therefore, at the time of the recording operation, tracking servo can be applied from the information on the groove, and an absolute address (ATIP) can be obtained from the wobble information on the groove. The RF amplifier 9 extracts wobble information WOB by a matrix operation process, and supplies this to the address decoder 23. The address decoder 23 obtains absolute address information by demodulating the supplied wobble information WOB, and supplies the absolute address information to the system controller 10. In addition, by injecting groove information into the PLL circuit, rotation speed information of the spindle motor 6 is obtained, and by comparing the rotation speed information with reference speed information, a spindle error signal SPE is generated and output.

The reproduced RF signal obtained by the RF amplifier 9 is 2
The signal is binarized by the value conversion circuit 11 to be a so-called EFM signal (8-14 modulated signal), which is supplied to the encoding / decoding unit 12. The encoding / decoding unit 12 includes a functional part as a decoder during reproduction and a functional part as an encoder during recording. During reproduction, processing such as EFM demodulation, CIRC error correction, deinterleaving, and CD-ROM decoding are performed as decoding processing.
The reproduction data converted into the ROM format data is obtained. Further, the encoding / decoding unit 12 is provided with a disk 90
The sub-code extraction process is also performed on the data read from the sub-system, and the TOC and address information as the sub-code (Q data) are supplied to the system controller 10. Further, the encoding / decoding unit 12 generates a reproduction clock synchronized with the EFM signal by PLL processing,
The decoding process is executed based on the reproduced clock. The rotational speed information of the spindle motor 6 is obtained from the reproduced clock, and is compared with the reference speed information to generate a spindle error signal SPE. it can.

The PLL of the encoding / decoding unit 12
The circuit is a so-called wide PL with a wide lock range.
L, so that the encoding / decoding unit 12
Can decode data and subcodes without being affected by the rotational speed of the disk. That is, even if the rotation of the disk by the spindle motor 6 is not controlled to around the predetermined number of rotations, it is possible to acquire the address of the subcode. For this reason, ATIP from the groove
As described with reference to FIG. 16, the subcode address can be obtained at a higher speed than the address.

At the time of reproduction, the encoding / decoding unit 12
Accumulates the data decoded as described above in the buffer memory 20. As a reproduction output from the disk drive device, data buffered in the buffer memory 20 is read and transferred and output.

The interface unit 13 is connected to an external host computer 80,
The communication of recording data, reproduction data, various commands, and the like is performed with the communication device. Actually, SCSI, ATAPI interface and the like are adopted. At the time of reproduction, the reproduced data decoded and stored in the buffer memory 20 is transferred and output to the host computer 80 via the interface unit 13. Note that a read command, a write command, and other signals from the host computer 80 are supplied to the system controller 10 via the interface unit 13.

On the other hand, at the time of recording, the host computer 8
Recording data (audio data or CD-ROM data) is transferred from 0, and the recording data is sent from the interface unit 13 to the buffer memory 20 and buffered. In this case, the encoding / decoding unit 1
2 is a process of encoding CD-ROM format data into CD format data (when supplied data is CD-ROM data), CIRC encoding and interleaving, adding subcode, Executes EFM modulation and the like.

The EFM signal obtained by the encoding process in the encoding / decoding unit 12 is sent to the laser driver 18 as a laser drive pulse (write data WDATA) after a waveform adjustment process is performed in the write strategy 21. In the write strategy 21, recording compensation, that is, fine adjustment of the optimum recording power with respect to the characteristics of the recording layer, the spot shape of the laser beam, the recording linear velocity, and the like is performed.

In the laser driver 18, the write data WD
A laser drive pulse supplied as ATA is supplied to the laser diode 4 to perform laser emission driving. As a result, pits (phase change pits and dye change pits) corresponding to the EFM signal are formed on the disk 90.

APC circuit (Auto Power Control) 19
Is a circuit unit for controlling the output of the laser so as to be constant irrespective of the temperature while monitoring the laser output power by the output of the monitoring detector 22. The target value of the laser output is given from the system controller 10, and the laser driver 18 is controlled so that the laser output level becomes the target value.

When erasing data recorded on the disk 90 (CD-RW), the encoding / decoding section 12 generates a signal of a predetermined erasure pattern under the control of the system controller 10. Then, the data is supplied to the laser driver 18 through the processing of the write strategy 21, and the data of the erasure pattern is overwritten and recorded on the erasure target portion of the disk 90. Alternatively, based on the control of the system controller 10, the APC circuit 1
9 erases the data on the disk 90 by causing the laser driver 18 to execute the laser emission of the erasing power (high level).

From the focus error signal FE and tracking error signal TE from the RF amplifier 9 and the spindle error signal SPE from the encode / decode unit 12 or the address decoder 20, the servo processor 14 determines the focus, tracking, thread and spindle. Generate various servo drive signals and execute servo operation. That is, the two-axis driver 1 generates the focus drive signal FD and the tracking drive signal TD according to the focus error signal FE and the tracking error signal TE.
6 The two-axis driver 16 drives the focus coil and the tracking coil of the two-axis mechanism 3 in the pickup 1. As a result, a tracking servo loop and a focus servo loop are formed by the pickup 1, the RF amplifier 9, the servo processor 14, the two-axis driver 16, and the two-axis mechanism 3.

In response to a track jump command from the system controller 10, the tracking servo loop is turned off and a jump drive signal is output to the biaxial driver 16 to execute a track jump operation.

The servo processor 14 further sends a spindle error signal S to the spindle motor driver 17.
A spindle drive signal generated according to the PE is supplied. The spindle motor driver 17 applies, for example, a three-phase drive signal to the spindle motor 6 in response to the spindle drive signal, and controls the CLV rotation of the spindle motor 6 or CA.
Execute V rotation. In addition, the servo processor 14 generates a spindle drive signal in response to a spindle kick / brake control signal from the system controller 10, and causes the spindle motor driver 17 to execute operations such as starting, stopping, accelerating, and decelerating the spindle motor 6.

Further, the servo processor 14 generates a thread drive signal based on, for example, a thread error signal obtained as a low-frequency component of the tracking error signal TE, an access execution control from the system controller 10, and supplies the thread drive signal to the thread driver 15. I do. The thread driver 15 drives the thread mechanism 8 according to a thread drive signal. Although not shown, the thread mechanism 8 includes
A mechanism including a main shaft for holding the pickup 1, a thread motor, a transmission gear, and the like is provided.
, The required sliding movement of the pickup 1 is performed.

The various operations of the servo system and the recording / reproducing system as described above are controlled by a system controller 10 formed by a microcomputer. The system controller 10 executes various processes according to a command from the host computer 80. For example, when a read command requesting transfer of certain data recorded on the disk 90 is supplied from the host computer 80,
First, seek operation control is performed for the designated address. That is, a command is issued to the servo processor 14 to execute the access operation of the pickup 1 targeting the address specified by the seek command. afterwards,
An operation control necessary for transferring the data in the designated data section to the host computer 80 is performed. That is, data reading / decoding / buffering from the disk 90 is performed, and the requested data is transferred.

When a write command (write command) is issued from the host computer 80, the system controller 10 first picks up the pickup 1 at the address to be written.
To move. Then, the encoding / decoding unit 12 causes the data transferred from the host computer 80 to perform the encoding process as described above.
FM signal. Then, as described above, the recording is executed by supplying the write data WDATA from the write strategy 21 to the laser driver 18.

The reproduced RF signal obtained by the RF amplifier 9 at the time of reproduction is also supplied to the pit detecting section 24. From the state of the reproduced RF signal, the pit detection unit 24 determines that the area on the disk 90 currently being scanned by the pickup 3 is a pit,
That is, it is determined whether or not the area is the area where the data as the dye change pit or the phase change pit is recorded, and the determination signal Spd is supplied to the system controller 10. The system controller 10 determines whether the current scanning position is a recorded area or an unrecorded area based on the determination signal Spd. The recorded area is recognized as an area from which a subcode address can be obtained, and the unrecorded area is recognized as an area from which a subcode address cannot be obtained.

2. Disc Structure and ATIP A CD disc, commonly referred to as a compact disc, has a single spiral recording track that starts at the center (inner circumference) of the disc and ends at the end (outer circumference) of the disc. In a disk on which data can be recorded on the user side, such as a CD-R / CD-RW, only grooves (guide grooves) for laser light guide are formed on a substrate as recording tracks before recording. By applying a laser beam modulated with high power to the light, a change in reflectivity or a change in phase of the recording film occurs, and data is recorded according to this principle. CD-DA, CD-R
In the case of a read-only disc such as an OM, there is no physical groove as a recording track.

In the CD-R, a recording film which can be recorded only once is formed. The recording film is an organic dye, and is a perforated recording using a high power laser. In a CD-RW in which a recording film that can be rewritten a large number of times is formed, the recording method is phase change recording, and data recording is performed as a difference between the reflectance in a crystalline state and the reflectance in an amorphous state. In terms of physical characteristics, the reflectivity of a read-only CD and a CD-R is 0.7 or more, while the CD-RW is about 0.2. -RW cannot be reproduced as it is. AG that amplifies weak signals
It is reproduced with the C (Auto Gain Control) function added.

In the CD-ROM, the lead-in area on the inner circumference of the disk is arranged over a range of a radius of 46 mm to 50 mm, and no pit exists on the inner circumference. CD-
As shown in FIG. 2, in the R and CD-RW, a PMA (Program Memory Area) and a PC are located on the inner peripheral side of the lead-in area.
A (Power Calibration Area) is provided.

A lead-in area and a program area used for recording actual data following the lead-in area are a CD.
The data is recorded by a drive device corresponding to -R or CD-RW, and is used for reproducing recorded contents in the same manner as CD-DA and the like. PMA uses a recording signal mode for each track recording,
The start and end time information is temporarily recorded. After all the planned tracks are recorded, a TOC (Table of contents) is formed in the lead-in area based on this information. PCA is an area for trial writing in order to obtain the optimum value of the laser power at the time of recording.

In a CD-R or CD-RW, a groove (guide groove) forming a data track is formed to be wobbled (meandering) for controlling a recording position and a spindle rotation. The wobble is formed based on a signal modulated by information such as an absolute address, and thus includes information such as an absolute address. That is, wobble information such as an absolute address can be read from the groove. The absolute time (address) information expressed by such a wobbled groove is stored in the ATIP (Ab
solute Time In Pregroove). The wobbling groove is slightly sinusoidal as shown in FIG.
le), its center frequency is 22.05 kHz,
The meandering amount is about ± 0.03 μm.

In the case of this example, not only absolute time information but also various information is encoded in this wobbling by FM modulation. The wobble information expressed by the wobbling groove will be described below.

Regarding the wobble information detected by the push-pull channel from the groove of the CD-R / CD-RW, the rotation of the spindle motor is controlled so that the center frequency becomes 22.05 kHz when the disk is rotated at the standard speed. Then, it is rotated at the linear velocity (for example, 1.2 m / s to 1.4 m / s in the case of the standard density) exactly defined by the CD method. In the case of CD-DA and CD-ROM, the absolute time information encoded in the subcode Q may be used. However, this information cannot be obtained in a CD-R or CD-RW disc (blank disc) before recording. It relies on absolute time information contained in wobble information.

One sector (ATI) as wobble information
The P sector) coincides with one data sector (2352 bytes) of the main channel after recording, and writing is performed while synchronizing the ATIP sector and the data sector.

The ATIP information is not directly encoded into wobble information, but is once subjected to bi-phase (Bi-Phase) modulation and then to FM modulation as shown in FIG. This is because the wobble signal is also used for rotation control. In other words, 1 every predetermined period by bi-phase modulation
And 0 are exchanged, and the average number of 1 and 0 is set to 1: 1 so that the average frequency of the wobble signal at the time of FM modulation is set to 22.05 kHz. Incidentally, as wobble information, in addition to time information, recording laser power setting information and the like are also encoded as special information and the like. On a CD-RW disc, the special information is extended to encode power and recording pulse information for the CD-RW.

FIG. 7 shows the structure of one frame (ATIP frame) as wobble information. The ATIP frame is formed of 42 bits, and as shown in FIG. 7A, a sync (synchronization) pattern of 4 bits from the beginning and a discriminator (identifier) of 3 bits are provided.
The bits are the contents recorded as actual wobble information. For example, it is a physical frame address or the like. Then, a 14-bit CRC is added to the end of the frame. In addition,
As shown in FIG. 7B, 4
In some frames, bits are used and wobble information is 20 bits.

As shown in FIG. 5 or 6, the synchronization pattern added to the head of the frame is "11101000" when the preceding bit is "0", and "1" when the preceding bit is "0".
In this case, "00010111" is used.

The 3-bit or 4-bit discriminator is an identifier indicating the content of the subsequent 21-bit or 20-bit wobble information, and is variously defined as shown in FIG. Note that 2 of bits M23 to M0 in FIG.
The 4 bits correspond to 24 bits at bit positions 5 to 28 in FIG. Bits M23, M2
2, M21 (or bits M23, M22, M21, M
20) is the discriminator, and this value is "00".
0 ”, the wobble information of the frame (M20 to
The contents of M0) indicate the addresses of the program area and the lead-out area. When the discriminator is "100", the contents of the wobble information (M20 to M0) of the frame indicate the address of the lead-in area. These correspond to the above-mentioned absolute address as ATIP. The time axis information as ATIP is recorded in a simple increase from the beginning of the program area toward the outer periphery of the disk, and is used for address control during recording.

When the discriminator is "101", it indicates that the wobble information (M20 to M0) of the frame is special information 1. When the discriminator is "110", the wobble information of the frame is "110". When the information (M20 to M0) is the special information 2 and the discriminator is "111", the wobble information (M20 to M0) of the frame is the special information 3
Is shown. When 4 bits are used as the discriminator and "0010" is set, it indicates that the wobble information (M19 to M0) of the frame is the special information 4.

When the discriminator is "010", it indicates that the wobble information (M20 to M0) of the frame is additional information 1.
When the discriminator is “011”, it indicates that the wobble information (M20 to M0) of the frame is additional information 2. Also, 4 bits are used as a discriminator, and "0011"
, The wobble information (M19
To M0) are supplement information.

Since the special information, additional information, and subordinate information have no direct relation to the present invention, a detailed description thereof will be omitted.

3. Subcode and TOC Next, a description will be given of a subcode recorded together with main data on a CD-format disc and a TOC recorded in a lead-in area.

The minimum unit of data recorded on a CD-type disc is one frame. One block is composed of 98 frames. Fig. 9 shows the structure of one frame.
become that way. One frame is composed of 588 bits,
The first 24 bits are used as synchronization data, and the following 14 bits are used as a subcode data area. After that, data and parity are allocated.

One block is composed of 98 frames of this configuration, and subcode data extracted from 98 frames are collected to form one block as shown in FIG.
The sub-code data (sub-coding frame) of the block is formed. First and second frames at the beginning of 98 frames (frame 98n + 1, frame 98n + 2)
Is a synchronization pattern.
Then, from the third frame to the 98th frame (frame 9
8n + 3 to frame 98n + 98), each of which has 96 bits of channel data, that is, P, Q, R, S, T, U,
V and W subcode data are formed.

Of these, P for managing access, etc.
Channel and Q channel are used. However, the P channel only indicates a pause portion between tracks, and the finer control is performed on the Q channel (Q1 to Q1).
Q96). The 96-bit Q channel data is configured as shown in FIG.

First, the four bits Q1 to Q4 are used as control data, and are used for discrimination of the number of audio channels, emphasis, CD-ROM, and whether or not digital copying is possible.

Next, the four bits Q5 to Q8 are set to ADR, which indicates the mode of the sub-Q data. Specifically, the mode (sub-Q data content) is expressed by the four bits of ADR as follows. 0000: Mode 0: Basically, sub-Q data is all zero (used in CD-RW) 0001: Mode 1: Normal mode 0010: Mode 2: Indicates the catalog number of the disc 0011: Mode 3 ..ISRC (International St
0100: Mode 4: Used for CD-V 0101: Mode 5: CD-R, CD-RW, CD
-Used in multi-session systems such as EXTRA

The 72 bits Q9 to Q80 following the ADR are used as sub-Q data, and the remaining Q81 to Q96 are CR bits.
C.

The address is represented by the sub-Q data when the mode 1 is indicated by the ADR. ADR = sub Q data and TOC in mode 1
The structure will be described with reference to FIGS. In the lead-in area of the disc, the sub-Q data recorded therein becomes the TOC information. That is, Q9 to Q8 in the Q channel data read from the lead-in area.
The 72-bit sub Q data of 0 has information as shown in FIG. FIG. 11 (a)
Shows the structure of FIG. 10B in the lead-in area as 7
This shows details of a 2-bit sub-Q data portion. The sub-Q data has data of 8 bits each,
Expresses TOC information.

First, a track number (TNO) is recorded in 8 bits Q9 to Q16. In the lead-in area, the track number is fixed to “00”. Then Q17 ~
POINT (point) is described by 8 bits of Q24. Q25-Q32, Q33-Q40, Q41-Q48
MIN (minutes), SEC (seconds), FRAME (frame) as the elapsed time in the lead-in area
Is shown. Q49 to Q56 are set to “00000000”. Furthermore, Q57 to Q64, Q65 to Q72, Q
PMIN, PSEC, P
FRAME is recorded, but this PMIN, PSEC,
The meaning of PFRAME is determined by the value of POINT.

When the value of POINT is "01" to "99", the value of POINT means a track number,
In this case, in PMIN, PSEC, and PFRAME, the start point (absolute time address) of the track of the track number is minute (PMIN), second (PSE).
C), frame (PFRAME).

When the value of POINT is "A0", PM
The track number of the first track is recorded in IN.
Further, specifications such as CD-DA (digital audio), CD-I, and CD-ROM (XA specification) are distinguished by the value of PSEC. When the value of POINT is “A1”, the track number of the last track is recorded in PMIN. When the value of POINT is “A2”, the PMI
The start point of the lead-out area is the absolute time address (minute (PMIN), N, PSEC, PFRAME).
Seconds (PSEC), frames (PFRAME)).

For example, in the case of a disc on which six tracks are recorded, data is recorded as a TOC using such sub-Q data as shown in FIG. TO
C, the track numbers TNO are all "00" as shown. Block NO. Indicates the number of one unit of sub-Q data read as 98-frame block data (sub-coding frame) as described above. Each TOC data has the same contents written over three blocks. As shown, when POINT is "01" to "06", PMIN,
Tracks # 1 to # 6 as PSEC and PFRAME
The start point of track # 6 is shown.

When POINT is “A0”, PM
“01” is shown as the first track number in IN. The disc is identified by the value of PSEC, and is "00" in the case of a normal audio CD. If the disc is a CD-ROM (XA specification), P
SEC = “20”.

When the value of POINT is P
The track number of the last track is recorded in MIN,
When the value of POINT is “A2”, PMIN, PSE
C, PFRAME indicate the start point of the lead-out area. After block n + 27, block n
.. N + 26 are repeatedly recorded.

In the program area and the lead-out area in which music and the like are recorded as tracks # 1 to #n, the sub-Q data recorded therein has the information shown in FIG. FIG. 11B shows the program area and the lead-out area in FIG.
FIG. 7B shows the structure of the sub-Q data of 72 bits in detail.

In this case, first, a track number (TNO) is recorded by eight bits Q9 to Q16. That is, for each of the tracks # 1 to #n, the value is any one of "01" to "99". In the lead-out area, the track number is "AA". Subsequently, an index is recorded in 8 bits Q17 to Q24. The index is information that can further subdivide each track.

Q25 to Q32, Q33 to Q40, Q41
Each of the 8 bits from Q48 to Q48 indicates MIN (minute), SEC (second), FRA as the elapsed time (relative address) in the track.
The ME (frame) is shown. Q49-Q56 is "00
000000 ”. Q57-Q64, Q65-Q
8 bits of 72, Q73-Q80 are AMIN, ASE
C, AFRAME, which are minute (AMIN), second (ASEC), and frame (AF) as absolute addresses.
RAME). The absolute address is an address continuously added from the head of the first track (that is, the head of the program area) to the lead-out area.

4. Address Acquisition Process Hereinafter, the address acquisition process of this example will be described.
As described above, the address is an address as subcode Q data (also referred to as a subcode address for the sake of explanation).
There is an ATIP (also referred to as a groove address for the sake of explanation) obtained from the groove. For example, before and after the access to move the pickup 1, it is necessary to obtain the address. To perform playback and recording. Here, which address is to be acquired is uniquely determined by acquiring a groove address since there is no subcode address in an area where data is not recorded. However, even when data recording is not completed, that is, when TOC is not recorded,
Since the subcode address already exists in the area where data recording has already been performed, it is possible to select which address to acquire.

In this example, when acquiring the address, the system controller 10 performs the processing shown in FIG. First, in step F101, the system controller 10 determines whether or not the area currently scanned by the pickup 3 is a data recorded area. This is determined by the determination signal Spd from the pit detector 24. If it is an area where data is not recorded, there is no subcode address, so the process proceeds to step F106, and ATIP from the address decoder 23 is used as an address.

On the other hand, if the area is a data-recorded area, the flow advances to step F102 to perform a process of obtaining subcode Q data. If the subcode address is supplied by the subcode extraction process by the encoding / decoding unit 12, the process proceeds from step F103 to F105, and the subcode address is used as the acquired address.

If the acquisition of the subcode address results in an error for some reason, step F104
Until it is determined that a timeout has occurred, the subcode address extraction processing of step F102 is repeated. Step F1
The time-out of 01 is, for example, a timer that starts time counting when the address acquisition process is started.
It is determined whether or not a predetermined count value has been exceeded. The time as the timeout may be set, for example, based on the read time difference Δt shown in FIG. 16 (for example, a time equal to or less than Δt). If the timeout has occurred without reading the subcode address, the process proceeds to step F106, and ATIP is used as the address.

By such processing, as long as the sub-code address exists, the acquisition of the sub-code address is performed by the AT.
Since priority is given over IP, the time required for the address acquisition processing is reduced as a whole. The time required for the entire data read is also reduced, and a disk drive device with a good operation response can be realized.

By the way, the address acquisition processing is performed as shown in FIG.
Processing such as 4 is also conceivable. In FIG. 14, the same processes as those in FIG. 13 have the same step numbers (F
102 to F106), and the description is omitted. That is, the process of FIG. 14 is performed without the determination of whether or not the area is the recorded area in step F101 of FIG. 13, and the process first proceeds to step F102 to try to obtain the subcode address. . And step F
Only when the subcode address is not obtained even if the timeout occurs in 104, the ATIP
Is used as the address.

If the time-out time is set to, for example, a time within Δt in FIG. 16, even if an attempt is made to obtain a subcode address when ATIP has to be used (in the case of an unrecorded area), There is no wasted time. In other words, in any case, the acquisition of the ATIP address is performed after the point of time ta in FIG. 16 which waits for the time of the disk rotation control. And if it is useless within Δt time, ATIP
When switching to address acquisition, AT
There is no difference in the time required to obtain an IP. Therefore, even in the processing method of first trying to obtain the subcode address without making a determination as to whether or not data has been recorded as shown in FIG. 14, the address acquisition processing can be speeded up as in the case of FIG. Also, even if ATIP is acquired, the processing is not delayed. In this case, the pit detector 24 in FIG. 1 can be omitted.

As described above, the processing of FIG. 13 or FIG. 14 speeds up the address acquisition processing as a whole, and can improve the performance of the apparatus. Also, when reading data by moving to a recorded area, even if ATIP is lost due to damage to the wobble on the disc, a correct address can be obtained from the subcode address. Furthermore, when performing data read with random access, there is no need to wait for disk rotation control, so the power consumed by the disk rotation motor can be reduced and the heat generated by the device itself can be reduced.

The configuration and various operation examples as the embodiment have been described above, but the present invention is not limited to these examples. For example, the present invention can be applied to other types of disk drive device configurations, ATIP structures, subcode structures, and the like. C as a recording medium
Although the DR and CD-RW discs have been described as examples, the present invention is also applicable as a recording / reproducing apparatus for other types of media.

[0079]

As will be understood from the above description, according to the present invention, there are two types of addresses, for example, an address obtained from a groove such as ATIP and an address obtained by being recorded together with data such as a subcode. In the case where the address exists and the address can be obtained from any of them, regardless of whether the TOC is already recorded or not, if the data is recorded only and the address (subcode address) is obtained from the read data, the address is obtained. The acquisition is prioritized. Then, if this is not possible, for example, only when the data is not recorded in the area or when the address cannot be extracted from the data, the address is obtained from the groove. For this reason, the opportunity of acquiring an address from a groove that requires waiting for the control time of the disk rotation speed after access or the like is reduced, and the opportunity of acquiring an address from faster read data is increased. In particular, in the case of data reproduction, an address acquisition by a subcode address is always attempted. This has the effect of speeding up the address read as a whole and improving the response of the device operation (particularly the data read operation).

In the case of reading data from the data recorded area, even if the groove address is lost due to the damage of the wobble on the disc, the address can be obtained from the address recorded together with the data. Operation becomes possible.

When performing data read with random access (that is, access to an area where data is recorded),
Since the groove address is not acquired, there is no need to wait for the disk rotation control at the time of acquiring the address, and there is also an advantage that the power consumed by the spindle motor for rotating the disk can be reduced, and the heat generation of the apparatus itself can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disk drive device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a disk layout.

FIG. 3 is an explanatory diagram of a wobbling groove.

FIG. 4 is an explanatory diagram of ATIP encoding.

FIG. 5 is an explanatory diagram of an ATIP sync waveform.

FIG. 6 is an explanatory diagram of an ATIP sync waveform.

FIG. 7 is an explanatory diagram of an ATIP frame.

FIG. 8 is an explanatory diagram of the contents of an ATIP frame.

FIG. 9 is an explanatory diagram of a frame structure of a CD system.

FIG. 10 is an explanatory diagram of a sub-coding frame of the CD system.

FIG. 11 is an explanatory diagram of sub-Q data of the CD system.

FIG. 12 is an explanatory diagram of a TOC structure of a CD system.

FIG. 13 is a flowchart of an address acquisition process according to the embodiment.

FIG. 14 is a flowchart of another example of the address acquisition processing according to the embodiment;

FIG. 15 is a flowchart of a conventional address acquisition process.

FIG. 16 is an explanatory diagram of a read time difference between a subcode address and an ATIP.

[Explanation of symbols]

1 pickup, 2 objective lens, 3 biaxial mechanism, 6
Spindle motor, 10 system controller, 1
2 encoder / decoder, 14 servo processor, 24 pit detector, 80 host computer,
90 disc

Claims (4)

[Claims] 1. A disk drive for a disk recording medium on which a recording track is formed by a groove on which address information is recorded and on which data is recorded according to a recording data format including the address information is irradiated with laser light. Recording / reproducing head means for performing recording / reproducing scanning of data on / from a disk recording medium; and detecting the presence / absence of a pit at the scanning position of the recording / reproducing head means to determine whether the scanning position of the recording / reproducing head means has data recorded. Discriminating means, first address extracting means for extracting address information from data read from a disk recording medium by the recording / reproducing head means, and information obtained from a groove of the disc recording medium by the recording / reproducing head means. Second to extract address information from the received information
If it is determined that the data has been recorded by the address extraction means and the determination means,
Address acquisition means for acquiring address information by the first address extraction means, and when the discrimination means judges that data has not been recorded, acquiring the address information by the second address extraction means. A disk drive device characterized by the above-mentioned. 2. A disk drive device for a disk recording medium on which a recording track is formed by a groove on which address information is recorded and on which data is recorded according to a recording data format including the address information. Recording / reproduction head means for performing recording / reproduction scanning of data on / from a disk recording medium; first address extraction means for extracting address information from data read from the disk recording medium by the recording / reproduction head means; Means for extracting address information from information obtained from a groove of a disk recording medium by means
First, the first address extracting means attempts to obtain address information, and if the first address extracting means cannot obtain the address, the second address extracting means attempts to obtain the address information. A disk drive device comprising: an address acquisition unit that attempts to acquire an address. 3. A method for obtaining an address in a disk drive device for a disk recording medium on which a recording track is formed by a groove on which address information is recorded and on which data is recorded in a recording data format including the address information. By detecting the presence or absence of a pit at the scanning position, it is determined whether or not the scanning position has data recorded. If the scanning position is determined to be a data recorded area, the read head reads data from the disk recording medium. The address information is extracted from the output data. On the other hand, if it is determined that the scanning position is not in the data recorded area, the address information is extracted from the information obtained from the groove of the disk recording medium by the reproducing head. An address acquisition method, characterized in that: 4. A method for obtaining an address in a disk drive device for a disk recording medium on which a recording track is formed by a groove on which address information is recorded and data is recorded in a recording data format including the address information. Performs address information acquisition processing from the data read from the disk recording medium, and when the address information cannot be acquired, subsequently, the address information from the information obtained from the groove of the disk recording medium by the reproduction head is used. An address acquisition method, which performs an acquisition process.