JP2002298370A - Reproducing device and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately discriminate a disk type without adding a special device configuration. SOLUTION: A sub-code in a program area in a CD format, etc., is read out, thus the disk type, for example, whether it is a standard disk or a high density disk is discriminated by data in the sub-code.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus and a reproducing method corresponding to a recording medium adopting, for example, a CD format or the like.

[0002]

2. Description of the Related Art For example, CD-DA (Compact Disc-Digital Audio), C
D-ROM, CD-R (CD-RECORDABLE), CD-RW
Various discs belonging to the so-called CD family, such as (CD-REWRITABLE), have been developed and spread. CD
-DA and CD-ROM are reproduction-only media. On the other hand, 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.

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, an absolute address (absolute address) and a relative address (relative address) can be recognized by extracting the subcode at each position on the disk.

An address is represented by a time value of, for example, minutes / seconds / 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 disc, so-called TOC information is formed by subcode information, and an address indicating the head or area of each track is described. The contents of the indicated address (what address is ) Is identified by point information presenting the information content. For example, when the point information takes a specific value, the information described in the subcode frame indicates not the absolute address or the relative address but the start address of each track or the first / last track number. And so forth.

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. 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.

[0007]

By the way, as such a disk of the CD format (CD standard), there are various types of disks as described above, and a large capacity is realized by further increasing the density. Discs have also been developed. Further, a disc having a plurality of areas having different physical characteristics, such as a so-called hybrid disc, has been developed.

In such a situation, from the viewpoint of the reproducing apparatus, in order to realize sufficient reproducing performance, various settings must be made according to the type of the loaded disc, that is, the difference in physical characteristics and data format. It needs to be optimized. For example, various servo gains, laser powers, decoding methods, and the like must be optimized. For this reason, when the disc is loaded, the playback apparatus needs to determine the type of the disc, and to perform optimal setting according to the type. For example, to distinguish between high density discs and traditional standard density discs,
The discrimination method can be considered by focusing on the difference between the linear velocity and the track pitch. However, the linear velocity is not so large, and when trying to detect the track pitch difference from the track verse signal, the influence of the eccentricity of the disk is required. Accurate determination is difficult due to the fact that it is easily affected.

It is also conceivable to perform some kind of calibration operation at the time of loading a disc in order to discriminate the disc type based on the difference in the physical characteristics of the disc. As a result, software and hardware are increased, and a time loss until recording or reproduction is started occurs.

It is not preferable to provide an additional device or circuit for discrimination from the viewpoint of simplification of the device configuration and cost reduction.

For these reasons, it is required to be able to easily and accurately determine the disc type.

[0012]

SUMMARY OF THE INVENTION According to the present invention, in accordance with such circumstances, in a reproducing apparatus corresponding to a plurality of types of recording media in which sub-codes are recorded together with main data, the type of recording media can be easily and accurately determined. The purpose is to enable discrimination.

For this reason, the reproducing apparatus of the present invention sets the reproducing means for reproducing information from the recording medium and various settings of the reproducing means to at least a subcode readable state irrespective of the type of the recording medium. The sub-code is read in the recording area of the main data on the medium, the discriminating means for discriminating the recording medium type from the content of the read sub-code, and various settings in the reproducing means are discriminated by the discriminating means. Setting control means for setting an optimum state for the recording medium type. For example, the above subcode is recorded in a CD format. The discriminating means determines whether the recording medium type is a standard-density recording medium or a high-density recording medium as the predetermined information in the subcode, depending on whether a valid numerical value or an invalid value is recorded. Determine.

A reproducing method according to the present invention is a reproducing method in a reproducing apparatus for a plurality of types of recording media in which sub-codes are recorded together with main data, wherein various settings are made when a recording medium is loaded in the reproducing device. Regardless of the type of recording medium, at least the subcode is set to be readable, the subcode is read from the recording area of the main data on the recording medium, the type of the recording medium is determined from the content of the read subcode, The reproduction is performed with the setting being optimal for the recording medium type determined by the determination means.

That is, in the present invention, the type of the recording medium is determined based on the difference between the subcodes in the CD format and the like. Then, based on the determination, an optimal setting state for reproducing the main data is set.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a disk drive according to an embodiment of the present invention will be described. First, a recording medium corresponding to the disk drive will be described. It is assumed that the recording medium is a CD disk. The description will be made in the following order. 1. 1. Overview of signal processing of CD system 2. CD format disc type 3. Recordable discs and grooves 4. Subcode and TOC 5. Configuration of disk drive device Example of discrimination processing when loading a disc

1. Overview of signal processing of CD system First, CD-DA, CD-ROM, CD-R, CD-R
A signal processing form of a CD type disc such as W will be described. In the CD system, an outline of signal processing until a stereo audio signal is recorded on a disk is as follows. The left and right (L-Ch, R-Ch) audio signal inputs are sampled at a sampling frequency of 44.1 kHz and then linearly quantized with 16 bits. The 16 bits are defined as one word, divided into 8 bits, and defined as one symbol. (1 symbol = 8 bits = 1/2 word) Then, 6 samples of both left and right channels, that is, 16 bits x 2 channels x 6 samples = 192 bits = 24 symbols are taken in, and a 4-symbol ECC (Error Correlation Code) is taken.
Recting Code (error correction code) is added as Q parity to make 28 symbols. As this ECC, CD
In the method, Reed-Solomon (Read-Solomoncode) is generated and added. Further, this signal is interleaved in order to cope with a continuous large defect (burst defect) on the disk substrate.

After the interleaving, four symbols of Read-Solomon code (Read-Solomon code) are further generated and added (P parity) to 32 symbols, and one symbol (sub-code) for control is added thereto, and EFM modulation is performed. (Eight to Fourteen Modulation). EFM modulation expands 8 bits to 14 bits.

In the EFM modulation, a quantized 16-bit signal is divided into upper 8 bits and lower 8 bits, and 8 bits are converted into 14 bits using the 8 bits as a minimum unit of the signal. This is a modulation method in which conversion is performed under the condition that two or more “0” s are between “1” and “1”, with 11 bits being the maximum continuous bit. After conversion, "1" indicates sign inversion (NRZ-I).

An 8-bit signal is "1" by EFM modulation.
A pattern in which two or more “0” s are present between “1” and “1” is converted into a 14-bit signal, and
Between each symbol, a 3-bit combined bit is provided between "1" and "1" in order to satisfy the restriction that two or more "0" s are included. For this reason, the signal after the EFM modulation, that is, the recording data stream has the minimum interval Tmin between bits.
= 3T (0.9nsec.), Maximum interval Tmax = 11T (3.3nsec.)
Nine kinds of bit lengths of 3T to 11T are obtained.

The data (frame) subjected to the EFM modulation is further added with a frame synchronizing signal and a control signal constituting a subcode, and the data stream is recorded on a disk. The frame synchronization signal and the subcode will be described later.

When the data string recorded as described above is reproduced, the data is decoded by the reverse process of the recording. That is, after the data string read from the disk is EFM demodulated, error correction processing, deinterleaving, and channel separation are performed.
Then, the L and R audio data in a quantized 16-bit, 44.1 KHz sampling state are D / A converted and output as a stereo music signal.

2. Disc Format of CD Format A disc type realized as the disc of the CD format of the present embodiment will be described with reference to FIGS.

FIG. 1 schematically shows a disc type based on the recording density. FIG. 1A shows a disk (hereinafter referred to as a standard disk) in which the entire area of the disk has a conventional recording density. CD-D that is now widely used
A, CD-ROM, CD-R, CD-RW and the like correspond to this. FIG. 1B shows a high-density disc developed in recent years. In this example, the entire area of the disc is recorded at a high density. For example, a disc having a density twice or more than that of a standard disc has been developed. In particular, high-density discs that can be recorded as CD-R and CD-RW have been developed. FIGS. 1C and 1D show a hybrid disc in which a standard density area and a high density area are separated on the inner circumference side and the outer circumference side (or vice versa).

Here, various characteristics / parameters in the case of the standard density and the case of the high density are as shown in FIG. The capacity of user data (main data to be recorded) is 650 Mbytes on a standard density disc.
(Disk with a diameter of 12 cm) or 195 Mbytes
(8 cm diameter disc), but for high density discs, 1.30 Gbyte (12 cm diameter disc) or 0.4 Gbyte (8 cm diameter disc)
Thus, a high-density disc realizes about twice the capacity.

The start position of the program area where user data is recorded is 50 mm in diameter on a standard density disc.
, And a high-density disc is defined as a position having a diameter of 48 mm. The track pitch is 1.6 μm for a standard density disk (standard density area) and 1.10 μm for a high density disk (high density area). The scanning speed is 1.2 to 1.4 m / s for the standard density disk (standard density area) and 0.90 m / s for the high density disk (high density area). The NA (aperture ratio) is 0.45 for a standard density disc (standard density area), and is 0.55 or 0.50 for a high density disc (high density area). Error correction method is CIRC4 method for standard density disc (standard density area),
For a high-density disk (high-density area), the CIRC7 system is adopted.

Other than these, the center hole diameter, the disk thickness, the laser wavelength, the modulation method, and the channel bit rate are the same between the standard density disk (standard density area) and the high density disk (high density area) as shown in the figure. .

For example, when considering a standard disk and a high-density disk shown in FIGS. 1A and 1B, it is necessary for the disk drive device to determine the disk type when the disk is loaded. Also, considering the hybrid discs shown in FIGS. 1C and 1D, the disc drive device needs to determine the area type of the area currently being recorded or reproduced is a high-density area or a standard-density area. is there. That is, by performing these determinations, the setting of the recording / reproducing operation is changed according to the parameter difference as shown in FIG.

FIGS. 3 and 4 schematically show types of data recording and reproduction. FIG. 3A shows a CD, for example.
-Indicates a read-only disk such as a DA or CD-ROM. That is, it is a disc on which all data is recorded in the form of embossed pits. FIG. 3B shows a write-once disc such as a CD-R. This write-once type disc is a medium in which a recording layer is formed by an organic dye, and data is recorded using characteristics of a dye change (reflectance change) by laser beam irradiation. Such write-once discs are also called write-once media because they can be recorded only once. FIG. 3C shows a rewritable disk using a phase change technique such as a CD-RW.

The write-once disc of FIG. 3B, FIG. 3C
In the rewritable disc, recording tracks are formed by spiral grooves. On the other hand, FIG.
In the read-only disc (a), recording tracks are formed by emboss pit rows, and no grooves are formed. As will be described in detail later, the groove in a write-once disc and a rewritable disc is wobbling.
The wobbling expresses an absolute address and other information. Therefore, at the time of recording, tracking control can be performed on the groove, and recording operation control can be performed based on data such as addresses read from the wobbling groove (hereinafter also referred to as “wobble information”). On the other hand, in a read-only disc, recording tracks are formed in advance by pit strings, and data such as addresses are recorded by sub-codes. Therefore, groove data is unnecessary in the first place.
For this reason, some disk drives only for reproduction do not have a function of reading groove information.

FIGS. 4A, 4B and 4C show examples of a hybrid disc. FIG. 4A shows a disc in which the inner peripheral side is a read-only area and the outer peripheral side is a write-once area. FIG. 4B shows a disc in which the inner peripheral side is a rewritable area and the outer peripheral side is a reproduction-only area. FIG. 4C shows a disc in which the inner peripheral side is a write-once area and the outer peripheral side is a rewritable area. As described above, there is a hybrid disc in which a read-only area, a write-once area, and a rewritable area are mixed on one disc. Although not shown, a hybrid disc in which three areas coexist is also conceivable. For example, the inner peripheral side, the middle peripheral side, and the outer peripheral side are respectively a reproduction-only area, a write-once area, and a rewritable area. For example, a reproduction-only area may be used. Of course, a case where four or more areas are mixed can be considered.

As described above, there are various types of disks due to differences in recording density and recording / reproducing, that is, various types of disks having different physical characteristics. The types are summarized in FIG.

FIG. 5A shows the type of a normal disk in which the entire disk is an area having one physical characteristic (here, "normal" means not a hybrid disk). That is, when the recording densities are classified into standard density and high density, and recording / reproducing types such as read-only, write-once, and rewritable, six types of discs can be considered as shown in FIG.

FIG. 5B shows the type of a hybrid disc in which two areas having different physical characteristics exist on the disc. 5A, 30 types of disk types are conceivable, from a type HD1 in which the inner side is the type and the outer side is the type, to a type HD30 in which the inner side is the type and the outer side is the type. Will be.

Assuming a hybrid disc in which three or more areas having different physical characteristics exist on the disc, it is obvious that more various types of discs can be considered.

In response to the existence of various disks having different physical characteristics as described above, the disk drive device accurately determines the type of the loaded disk (or the type of the area to be reproduced). Discrimination and processing in accordance with the physical characteristics are necessary for improving the reproduction performance.

3. Recordable discs and grooves

A C which is generally called a compact disk
A D-type 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. On a disk such as a CD-R / CD-RW on which data can be recorded on the user side, before recording, only a guide groove for laser light guide is formed on a substrate as a recording track. 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-RO
In the case of a read-only disc such as M, 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 46 mm to 50 mm in diameter (up to 48 mm in the case of high density), and no pit exists on the inner circumference. CD-R and CD-RW
Then, as shown in FIG. 6, a PMA (Program Memory Area) and a PCA (Power Calibr
ation 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. Note that the absolute time (address) information represented by such a wobbled groove is represented by ATI.
It is called P (Absolute Time In Pregroove). As shown in FIG. 7, the wobbling groove is slightly sinusoidal (Wobble), and its center frequency is 22.05 kHz.
In z, 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. Regarding the wobble information detected by the push-pull channel from the groove of the CD-R / CD-RW, when the rotation of the spindle motor is controlled so that the center frequency becomes 22.05 kHz when the disc is rotated at the standard speed, it is just that. It is rotated at a linear velocity (for example, 1.2 m / s to 1.4 m / s in the case of standard density) specified 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 modulation and then 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. Although detailed description is omitted, as wobble information, recording laser power setting information and the like are also encoded as special information and the like in addition to time information. CD-R
In the W disk, the special information is extended and the power and recording pulse information for the CD-RW are encoded.

The wobble information includes a predetermined frame (ATI
P frame), and its ATIP frame is 4
It is formed of 2 bits, and includes a sync (synchronization) pattern of 4 bits from the beginning, a discriminator (identifier) of 3 bits, wobble information content (eg, a physical frame address) of 21 bits, and a CRC of 14 bits.

The synchronization pattern added to the head of the frame is as shown in FIG. 9 for a standard disc, and as shown in FIG. 10 for a high-density disc. That is, in the case of the standard disk shown in FIG. 9, the sync pattern of “11101000” is used when the preceding bit is “0”, and “000101111” is used when the preceding bit is “1”. In the case of the high-density disc of FIG. 10, a sync pattern of “111100010” is used when the preceding bit is “0”, and “00011101” is used when the preceding bit is “1”. Therefore, this ATIP sync pattern is an element that can identify a standard disk and a high-density disk.

4. Subcode and TOC The TOC and the subcode recorded in the lead-in area on the CD format disc will be described. The minimum unit of data recorded on a CD disk is one frame. One block is composed of 98 frames.

The structure of one frame is as shown in FIG.
One frame is composed of 588 bits. The first 24 bits are synchronous data, and the following 14 bits are a subcode data area. After that, data and parity are allocated.

One frame is composed of 98 frames in 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 shows 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, four bits Q1 to Q4 are used as control data, and are used for discrimination of the number of audio channels, emphasis, CD-ROM, whether digital copying is possible, and the like.

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 ADR 4 bits as follows. 0000: Mode 0: Basically, all 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 system 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 (absolute address, relative address) is expressed by the sub-Q data when the mode 1 is indicated by ADR. Regarding the address format in the sub-Q data, a format adopted for a standard disc will be described with reference to FIG. 13, and a format adopted for a high density disc will be described with reference to FIG. In the case of the high-density mode, it is necessary to increase the maximum value of the absolute address and the like with the increase in the capacity. For this reason, the address value expressed in minutes / seconds / frames on the standard disk is changed to the high-density disk. In this example, the time is expressed in hours / minutes / seconds / frame.

The sub-Q data in the case of ADR = mode 1 will be described with reference to FIGS. 13 and 14, and the TOC structure composed of the sub-Q data will be described with reference to FIG. 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 sub-Q data of 72 bits of 0 has information as shown in FIG. 13 (a) or FIG. 14 (a). Note that FIGS. 13A and 14A show the structure (Q1 to Q96) of FIG. 12B in the lead-in area.
FIG. 7 shows the 2-bit sub Q data portion (Q9 to Q88) in detail. The sub-Q data has 8-bit data and expresses TOC information.

In the case of the standard disk shown in FIG. 13A, first, the track number (TNO) is set to 8 bits Q9 to Q16.
Is recorded. In the lead-in area, the track number is fixed to “00”. Subsequently, POINT (point) is described by 8 bits of Q17 to Q24. Q25-Q3
2, 8 bits each of Q33 to Q40 and Q41 to Q48,
MIN (minute), SEC (second), FR as absolute address
AME (frame) is shown. Q49-Q56 is "0
000000 ". Further, Q57 to Q64,
8 bits each for Q65 to Q72 and Q73 to Q80, PM
IN, PSEC, and PFRAME are recorded.
The meaning of MIN, PSEC, and PFRAME is determined by the value of POINT.

On the other hand, in the case of the high-density disc shown in FIG. 14A, eight bits Q49 to Q56 are used every four bits to indicate "time" which is higher in minutes / seconds / frames. .

That is, in the lead-in area, Q49, Q5
0, Q51 and Q52, “MIN”, “SE”
C and FRAME, so that the time “HOUR” is recorded, Q53, Q54, Q55, Q56.
"PMIN", "PSEC", "PFR"
The time “PHOUR” which is higher than “AME” is recorded.

In the sub-Q data in the lead-in area as shown in FIGS. 13A and 14A, the following information is defined by the value of the point (POINT). First, in the case of FIG. 13A, the value of POINT is BC
"01" to "9" according to the D code (binary-coded decimal code)
9 ", the value of the POINT means a track number. In this case, PMIN, PSEC, PF
In the RAME, the start point (absolute time address) of the track of the track number is minute (PMI).
N), seconds (PSEC), and frames (PFRAME). When the value of POINT is "A0", the track number of the first track in the program area is recorded in PMIN, and CD-DA (digital audio), CD-I, CD-
A specification such as a ROM (XA specification) is distinguished. Further, when the value of POINT is "A1", the track number of the last track of the program area 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)).

On the other hand, in the case of FIG.
Is a binary code value of “01” to “9F”, the value of the POINT means a track number, and in this case, POUR, PMIN, PSEC,
In PFRAME, the start point (absolute time address) of the track of the track number is hour (PHO
UR), minutes (PMIN), seconds (PSEC), and frames (PFRAME). When the value of POINT is “A0”, the track number of the first track in the program area is recorded in PMIN,
The session format is distinguished by the value of SEC. PSEC = "20" for normal high density disc
It is said. When the value of POINT is "A1", PMI
In N, the track number of the last track in the program area is recorded. When the value of POINT is "A2",
The start point of the lead-out area is the absolute time address (hour (PHOUR), minute (PMIN), second (PSE) in POUR, PMIN, PSEC, and PFRAME.
C), frame (PFRAME)).

The values of POINT include those already defined at present and those defined in the future such as "B *" and "C *" after "A3", but their description is omitted. I do.

FIG. 13A or FIG.
The TOC is constituted by the sub-Q data of (a). For example, in the case of a disc in which six tracks are recorded in the program area, the TOC by such sub-Q data is used.
As the OC, data is recorded as shown in FIG.

Since the TOC is the TOC, the track numbers TNO are all "00" as shown in the figure. 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 in the figure, there are provided cases where the POINT is "01" to "06" corresponding to six tracks (music and the like), and in each case, POUR, PMIN, PSEC,
First track # 1 to sixth track # as PFRAME
6 starting points are shown. Note that FIG.
5 is a TO value based on the sub-Q data of FIG.
Although the data is C data, in the case of the TOC data based on the sub-Q data shown in FIG. 13A, it goes without saying that the POUR part does not exist.

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 "20" in the case of a CD of a high-density disc.

When the value of POINT is P
The track number of the last track (in this case, “06”) is recorded in MIN. Furthermore, if the value of POINT is "A
2), POUR, PMIN, PSEC, PF
The start point of the lead-out area is indicated in RAME. After block n + 27, blocks n to n + 2
6 is recorded again and again.

This example merely shows a case in which there are six tracks and there are blocks having POINT values of "A0", "A1" and "A2". In practice, blocks having a POINT value of “A3” or later, for example, information such as “F0” and “CF” described later may be provided, and the number of tracks naturally differs depending on the disc. Therefore, one unit as the TOC data is not fixed to 27 blocks as shown in FIG.

In the program area and lead-out area in which music and the like are recorded as tracks # 1 to #n, the sub-Q data recorded there is the information shown in FIG. 13 (b) or FIG. 14 (b). Having. In addition,
FIGS. 13B and 14B show in detail the 72-bit sub-Q data portions (Q9 to Q88) in the structure (Q1 to Q96) of FIG. 12B in the program area and lead-out area. It is a thing.

In the case of FIG. 13B, first, a track number (TNO) is recorded by eight bits Q9 to Q16. That is, in each of tracks # 1 to #n, "0"
1 "to" 99 ". In the lead-out area, the track number is "AA". Subsequently, an index (X) is recorded with 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.

On the other hand, in the case of FIG.
A track number (TNO) is recorded by 16 8 bits. In this case, in each of the tracks # 1 to #n, the track number of the track is described by one of the values of “01” to “9F” by the binary code. In decimal notation, it is "0" to "159", so that a track number can be assigned to 159 tracks. In the lead-out area, the track number is "AA".
Next, the index (X) is set using 8 bits Q17 to Q24.
Is recorded. The index is information that can further subdivide each track. The index number is any one of “01” to “9F” in the binary code.

Q25 to Q32, Q33 to Q40, Q41
The range of each of 8 bits from Q48 to Q48 is set to MIN (minute), SEC (second), and FRAME (frame) as in the case of the standard disk, and furthermore, Q49, Q50, Q51, Q
52 bits, “MIN”, “SEC”, “FRA”
A time “HOUR” which is higher than “ME” is prepared. However, in the case of a high-density disc, the "MIN""S
EC, FRAME, and HOUR are "FF" and "F
Invalid values are written as "F", "FF" and "F". That is, in the case of a high-density disc, the relative time is not used.

Q57 to Q64, Q65 to Q72, Q73
8 bits of AMIN, ASEC, AFRA
ME, which is equivalent to an absolute address (AM
IN), seconds (ASEC), and frames (AFRAME). Also, four bits of Q53, Q54, Q55, and Q56 are used to record the time "AHOUR" that is higher than "AMIN", "ASEC", and "AFRAME". Therefore,
The absolute address is also expressed in the form of hour / minute / second / frame. 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.

5. Configuration of Disk Drive Device Next, a description will be given of a disk drive device capable of performing recording / reproduction corresponding to various types of disks as described above. FIG. 16 shows a configuration of the disk drive device 70.
In FIG. 16, a disk 90 is a CD-R, a CD-R
This is a disk in a CD format such as W, CD-DA, and CD-ROM. As these disks, FIG.
As described with reference to FIG. 5, there are various types.

The disk 90 is loaded on the turntable 7, and during recording / reproducing operation, the spindle motor 1 drives the disk 90 at a constant linear velocity (CLV) or a constant angular velocity (CA).
V). Then, pit data on the disk 90 is read by the optical pickup 1. The pit is a phase change pit in the case of a CD-RW,
In the case of CD-R, it is a pit due to a change in organic dye (change in reflectance), and in the case of a CD-DA or CD-ROM, it is an emboss pit.

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 focusing 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 of 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 a binarization circuit 11, and the focus error signal FE and the tracking error signal TE are supplied to a servo processor 14.

As described above, CD-R, CD-R
A groove (groove) serving as a guide for a recording track is previously formed on the disk 90 as W, and the groove is wobbled (meandered) by a signal obtained by FM-modulating time information indicating an absolute address on the disk. It has become. Therefore, during the recording / reproducing operation, the tracking servo can be applied from the groove information,
An absolute address and various kinds of physical information can be obtained as wobble information of the groove. The RF amplifier 9 extracts wobble information WOB by a matrix operation process and supplies the wobble information WOB to the groove decoder 23.

The groove 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. Note that there are a standard density disc and a high density disc as the CD-R and CD-RW, but the groove decoder 23 switches the decoding method according to the density type from the system controller 10. Specifically, switching of a frame sync matching pattern is performed.

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 encoding / decoding unit 12 switches the processing method depending on whether the disk (or unit area) to be recorded or reproduced has the standard density or the high density.

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 for 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 for the characteristics of the recording layer, the spot shape of the laser beam, the recording linear velocity, and the like, and the adjustment of the laser drive pulse waveform are 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.

The servo processor 14 determines the focus, tracking, thread, and spindle from the focus error signal FE and the tracking error signal TE from the RF amplifier 9 and the spindle error signal SPE from the encode / decode section 12 or the address decoder 20. 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 two-axis 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 outputs 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 accordance with 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.

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 or 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,
The operation control required to transfer 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.

In the example of FIG. 16, the disk drive device 70 is connected to the host computer 80. However, as the disk drive device serving as the playback device of the present invention, for example, an audio CD player or the like is used. There may be a form that is not connected to the host computer 80 or the like. In that case, an operation unit and a display unit are provided,
The configuration of the data input / output interface is shown in FIG.
Will be different. That is, recording and reproduction are performed in accordance with the operation of the user, and a terminal unit for inputting and outputting audio data may be formed. Further, the display unit may be configured to display the track number and time (absolute address or relative address) during recording / reproduction.

Of course, various other examples of the configuration are conceivable. For example, a configuration in which the recording system is eliminated from the configuration shown in FIG.

6. Example of discrimination processing at the time of loading a disc When the disc 90 is loaded in the disc drive device, as a processing example for discriminating the disc type, a processing example shown in FIG. 17 and a processing example shown in FIGS. The following two examples will be described. The flowchart shown as each example is processing performed by the system controller 10.

First, in the processing example of FIG. 17, it is determined whether the disk 90 loaded for reproduction is a standard disk or a high-density disk, and the optimum setting is made accordingly. As shown in FIG. 17, when the disk 90 is loaded, the system controller 10 proceeds to step F101.
, Each section of the reproduction system is set to an intermediate setting. The setting here refers to the setting of various constants, parameters, and the like of the reproduction system. For example, the equalizing coefficient of the RF amplifier, the adjustment coefficient of the tracking error signal TE according to the difference in the track pitch, the servo gain, and the encoding / PLL setting for obtaining a reproduction clock in the decoding unit 12,
There are an error correction method, a CD-ROM decoding method, a matching method of the sync pattern of the groove decoder 23, and the like. That is, FIG. 2 shows the difference between the standard disk and the high-density disk, but the above setting should be optimized mainly according to these differences. And step F10
The intermediate setting in 1 means that these coefficients, parameters, and the like are set to an intermediate value such that at least the subcode data can be read whether the disk 90 is a standard disk or a high-density disk. Setting value.

As shown in FIG. 2, the error correction method is the CIRC4 method for a standard disk and the CIRC7 method for a high-density disk, and there is no intermediate setting. From the viewpoint of reading the code data, it is possible to set either of them at this time. That is, the intermediate setting can ignore the setting related to the decoding of the main data.

Subsequently, the system controller 10 executes a start-up process in step F102. That is, the spindle motor 6 is started, servo settling at a predetermined rotation speed, laser emission start, focus servo pull-in and settling, and tracking servo settling are performed, so that data can be read from the disk 90. And step F1
03 is accessed at the position of the disk 90 having a diameter of 50 mm. This access is for reading subcode data in the program area. At this point, it is not possible to determine whether the disk 90 is a standard disk or a high-density disk. However, the position of 50 mm in diameter is a program area for any disk. That is, as shown in FIG. 2, the program area starts at a position of 50 mm in diameter in the case of a standard disk, and the program area starts at a position of 48 mm in the case of a high-density disk.

Subsequently, in step F104, a diameter of 50 mm
, The sub-code data is extracted by the encoding / decoding unit 12 and read. The reading of the subcode data is a process of determining the disc type, specifically, whether the disc is a standard disc or a high-density disc. The subcode Q data in the program area is shown in FIG.
FIG. 14B shows a case of a high-density disk. In other words, MIN, SE for a standard disc
While valid values (hour / minute / second) as relative addresses are recorded as C and FRAME, MIN, SEC, FRAME, HO
The UR is an invalid value of “FF”, “FF”, “FF”, and “F”. That is, from this difference, it can be determined whether the disc is a standard disc or a high-density disc.

The system controller 10 sets the MIN, S
EC, FRAME, HOUR are "FF""FF""F
If "F" or "F", the disc 90 is determined to be a high-density disc, and the process proceeds from step F105 to F106 to perform various settings corresponding to the high-density disc. on the other hand,
If valid numerical values are recorded as MIN, SEC, and FRAME, the disc 90 is determined to be a standard disc, and the process proceeds from step F105 to F107 to perform various settings corresponding to the standard disc.

That is, in step F106 or F107, the encoding /
PLL and decoding processing mode in the decoding unit 12,
The processing mode in the groove decoder 23 is switched. Further, the RF gain and equalizing characteristics of the RF amplifier 9, various servo gains such as focusing and tracking, setting of a calculation coefficient at the time of seek due to a different track pitch, and the like are also set in accordance with the discrimination between the high density and the standard density.

The system controller 10 determines in step F
After the optimal settings are made in accordance with the type of the disc 90 loaded in 106 or F107, the process proceeds to step F108, where the pickup 1 is made to access the lead-in area and the TOC data is read. In this way, the loaded disk 90 can be played back, and in step F109, a playback command from the host computer 80 is awaited. Thereafter, if there is a playback command, the playback operation is actually executed.

As described above, when a disc is loaded, whether the disc is a standard disc or a high-density disc is determined from the subcode Q data in the program area. Since the discrimination is based on the recorded subcode data, it is accurate. And no special devices or circuits are required.

Next, the processing examples of FIGS. 18 and 19 will be described. This is a processing example in which a read-only disk / recordable disk is determined for a loaded disk, and in each case, it is determined whether the disk is a standard disk or a high-density disk.

When the disc 90 is loaded, the system controller 10 sets each part of the reproduction system to an intermediate setting in step F201 in FIG. Then, in step F202, a start-up process is performed, and in step F203, a position having a diameter of 50 mm is accessed. The processing so far is the same as steps F101, F102, and F103 in the case of FIG.

Subsequently, in step F104, a diameter of 50 mm
The reproduction trace is executed by the pickup 1 at the position (1), and it is first determined whether or not the groove decoder 23 can decode the ATIP information. That is, it is determined whether or not a groove exists on the disc. Here, if there is no groove, it can be determined that the disc is a read-only disc such as a CD-DA or a CD-ROM. On the other hand, if the groove exists, it can be determined that the disc is a recordable disc such as a CD-R or a CD-RW.

If it is determined that the disc is a reproduction-only disc, the process proceeds from step F204 to F205, where the encoding / decoding unit 12 extracts subcode data from information obtained from the reproduction trace being executed, and reads it. In the case where the reading of the subcode data in this case is a read-only disc, this is a process of determining whether the disc is a standard disc or a high-density disc. That is, as in the case of FIG. 17 described above, the system controller 10 sets MIN, SEC, FRAME, and HOUR as
If "FF", "FF", "FF", or "F", the disc 90 is determined to be a read-only type high-density disc, and the process proceeds from step F206 to F207 to correspond to the read-only high-density disc. Make various settings. On the other hand, MI
If a valid numerical value is recorded as N, SEC, or FRAME, the disc 90 is determined to be a read-only type standard disc, and the process proceeds from step F206 to F208 to perform various settings corresponding to the read-only standard disc. Do.

In other words, in step F207 or F208, depending on whether the disc is a read-only disc and has a high density or a standard density, the PLL / decoding processing mode in the encoding / decoding section 12 and the groove decoder 23
, An RF gain and an equalizing characteristic in the RF amplifier 9, various servo gains such as focusing and tracking, setting of an operation coefficient at a seek due to a different track pitch, and the like.

If the system controller 10 has made the optimum setting in accordance with the type of the disc 90 loaded in step F207 or F208, the system controller 10 proceeds to step F209.
To make the pickup 1 access the lead-in area and execute the reading of the TOC data. Thus, the loaded disk 90 can be played back. In step F210, a playback command from the host computer 80 is awaited. Thereafter, if there is a playback command, the playback operation is actually executed.

On the other hand, if the presence of a groove is detected in step F204 and it is determined that the loaded disk 90 is a recordable disk, the flow proceeds to step F211 in FIG.
Then, the ATIP sync pattern is determined first. For example, it is determined which of the sync patterns in FIGS. 9 and 10 the pattern detected with periodicity is. The difference between the sync patterns makes it possible to determine whether the disc is a standard disc or a high-density disc. Step F21
In step 2, the subcode data is extracted by the encoding / decoding unit 12 from the information obtained in the reproduction trace being executed, and is read. Also in this case, as described above, MIN, SEC, FRAME, and HOUR are set to “F
F, “FF”, “FF”, and “F” indicate a high-density disc, while a valid disc recorded in MIN, SEC, and FRAME indicates that the disc is a standard disc.

However, subcode data may not be extracted here. That is, no data is recorded near the head position of the program area. This can be determined to be a recordable disc such as a CD-R or a CD-RW and a disc on which data has not been recorded yet. In this case, steps F213 to F214
To process as an unrecorded disc. For example, it is determined from the above ATIP sync pattern whether the disk is a standard disk or a high-density disk, and various settings are made, and the host computer 80
What is necessary is just to wait for the write command from. If the disk drive device is a reproduction-only device, an error may be processed as a disk that cannot be reproduced because it is not recorded.

When the subcode data has been extracted, the process proceeds from step F213 to F215. Here, ATI
From both the detection result of the P sync pattern and the values of MIN, SEC, FRAME, and HOUR of the subcode Q data, it is determined whether the disc is a standard disc or a high-density disc. Note that it is possible to determine whether the disc is a standard disc or a high-density disc using only one of the ATIP sync pattern and the subcode Q data. By confirming both, a more accurate discrimination result can be obtained. Obtainable.

If the system controller 10 determines that the disk 90 is a recordable high-density disk, the process proceeds from step F216 to step F217, and performs various settings corresponding to the recordable high-density disk. On the other hand, if it is determined that the disc 90 is a recordable type standard disc, the process proceeds from step F216 to step F218, where various settings are made corresponding to the recordable standard disc. Then, the process proceeds to step F209 in FIG. 18 to make the pickup 1 access the lead-in area and execute the reading of the TOC data. Disc 90 loaded above
, And a reproduction command from the host computer 80 is awaited in step F210. Thereafter, if there is a playback command, the playback operation is actually executed.

By such processing, it can be determined whether the loaded disk 90 is a read-only disk such as a CD-DA or a CD-ROM, or a recordable disk such as a CD-R or a CD-RW. In addition, in each case, it is possible to determine whether the disk is a standard disk or a high-density disk, and various coefficients, parameters, and the like can be set to an optimal state according to the determination result. Thereby, the reproduction performance can be improved.

The above processing is described in FIG.
The standard disk and the high-density disk shown in FIG. 1B are assumed, and the hybrid disk as shown in FIGS. 1C and 1D is not mentioned. Applicable. That is,
By extracting the subcode Q data in the program area for each unit area on the hybrid disc,
It is possible to determine whether the unit area is a standard density area or a high density area.

While the example of the embodiment has been described above, the configuration of the disk drive device, the processing example, the structure of the wobble information on the disk, the structure of the sub-Q data, and the like are not limited to the above example, and various modifications are possible. Examples are possible.

[0119]

As can be seen from the above description, according to the present invention, the disc type, for example, whether the disc is a standard disc or a high-density disc, is determined by using the subcode in the program area in the CD format or the like. Therefore, there is an effect that the disc type can be easily and accurately determined without providing a special device or circuit system for the determination. Then, various settings relating to the reproduction operation, such as servo gain, laser power and laser drive waveform, and settings such as decode processing can be appropriately performed, so that appropriate reproduction processing is performed according to various discs. This has the effect that the reproduction performance can be improved. Further, since the physical characteristics and the like are not determined by any calibration operation or the like, the disk type can be theoretically determined with 100% accuracy, and the time until the start of the reproducing operation can be shortened.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a type of a disk used in an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a high-density disc and a standard disc according to the embodiment.

FIG. 3 is an explanatory diagram of a disc type according to the embodiment;

FIG. 4 is an explanatory diagram of a hybrid disc type according to the embodiment.

FIG. 5 is an explanatory diagram of a hybrid disc type according to the embodiment.

FIG. 6 is an explanatory diagram of a disc layout of a CD-R and a CD-RW.

FIG. 7 is an explanatory diagram of a wobbling groove.

FIG. 8 is an explanatory diagram of ATIP encoding.

FIG. 9 is an explanatory diagram of an ATIP waveform.

FIG. 10 is an explanatory diagram of an ATIP waveform.

FIG. 11 is an explanatory diagram of a frame structure of a disk.

FIG. 12 is an explanatory diagram of a sub-coding frame of a disc.

FIG. 13 is an explanatory diagram of sub-Q data of a standard disc.

FIG. 14 is an explanatory diagram of sub-Q data of a high-density disc.

FIG. 15 is an explanatory diagram of a TOC structure of the disk of the embodiment.

FIG. 16 is a block diagram of the disk drive device according to the embodiment.

FIG. 17 is a flowchart of a disk type determination process according to the embodiment.

FIG. 18 is a flowchart of a disk type determination process according to the embodiment.

FIG. 19 is a flowchart of a disk type determination process according to the embodiment.

[Description of Signs] 1 pickup, 2 objective lens, 3 biaxial mechanism, 4
Laser diode, 5 photo detector, 6 spindle motor, 8 thread mechanism, 9 RF amplifier, 1
0 system controller, 12 decoder, 13 interface unit, 14 servo processor, 20 buffer memory, 21 write strategy, 23 groove decoder, 70 disk drive device, 80 host computer, 90 disk

Continued on front page F term (reference) 5D044 AB05 BC02 CC05 DE39 DE49 DE55 FG18 GK08 GK12 5D066 HA01 5D090 AA01 BB02 BB03 BB04 CC04 CC18 DD03 FF49 GG17

Claims (4)

[Claims] 1. A reproducing apparatus corresponding to a plurality of types of recording media on which sub-codes are recorded together with main data, comprising: reproducing means for reproducing information from the recording medium; A determination means for setting at least a subcode readable state, reading the subcode in a recording area of the main data on a recording medium, and determining a recording medium type from the content of the read subcode; A setting control unit for setting various settings in the reproducing unit to an optimum state for the recording medium type determined by the determining unit. 2. The reproducing apparatus according to claim 1, wherein the subcode is recorded in a CD format. 3. The discrimination means determines whether the recording medium type is a standard density recording medium or a high density The reproducing apparatus according to claim 1, wherein it is determined whether the recording medium is a recording medium. 4. A reproducing method for a plurality of types of recording media in which sub-codes are recorded together with main data in a reproducing device, wherein when a recording medium is loaded in the reproducing device, various settings are made regardless of the type of the recording medium. First, the sub-code is set to at least a readable state, the sub-code is read from the recording area of the main data on the recording medium, the type of the recording medium is determined from the content of the read sub-code, and the various settings are determined by the determination. A reproduction method characterized in that reproduction is performed in an optimum state for the recording medium type determined by the means.