JP2001167561A - Disk-like recording medium, data recording device and method and data reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To express the absolute time that can correspond to a large-capacity optical disk, etc., and to easily discriminate the type of the optical disk. SOLUTION: An absolute time area is extended by means of a comparatively unimportant area such as a zero data area and/or a relative time area included in a Q channel contained in a subcode of a CD recording format. Concretely an absolute time is expressed by performing the BCD expression of the digits of '100 minutes' by means of lower 4 bits included in an 8-bit zero data area ZERO. Thus, the absolute times covering up to the largest 999 minutes 59 seconds 74 frame can be expressed. Meanwhile, the identification information showing an optical disk of large capacity and high density, for example, can be expressed by means of higher 4 bits included in the area ZERO.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped recording medium, a data recording device and method applicable to a plurality of types of optical disks having different recording densities, and a data reproducing device.

[0002]

2. Description of the Related Art In recent years, an optical disk has been developed as a large-capacity recording medium. For example, there is a read-only disc such as a CD (Compact Disc) on which music information is recorded and a CD-ROM on which data for a computer is recorded. In these optical disks, along with audio data and the like, eight channels (P, Q, R, S, T, U, V,
W) is prepared, and Q
Time information of audio data and digital data is recorded in 72-bit data in a channel.

The time information includes an absolute time, which is the elapsed playback time from the beginning of a recording area in a CD or the like, a relative time, which is an elapsed playback time from the beginning of each song or each index (elapsed time in a movement). There is. These time information
Minute (MIN), second (SEC), frame number (FRAME)
In a unit (expressed as MSF format)
BCD (Binary Coded Decimal: 2 Evolution 1)
0) coded. For a normal CD, 75 seconds per second
It is a frame and can represent an absolute time from 00 minutes 00 seconds 00 frames or 199 minutes 59 seconds 74 frames (however, the absolute time is less than 80 minutes in the CD standard). In the case of a CD-ROM, the time information indicates address information of digital data.

Recently, a write-once CD-R (CD-Re
Optical discs such as cordable, rewritable CD-RW (CD-Rewritable) and the like, on which data can be additionally written and rewritten, are being put to practical use. In these discs, 22.
ATIP (Absolute Time In Pregroove) in guide groove (pregroove) wobbled with sine waveform of 05Hz
The recording address information called FM
The BCD expression is made in a format.

[0005]

There is a strong demand in the market for a high-density optical disk having the above-mentioned optical disk having a large capacity and a high density. In the case of a high-density optical disk, inconvenience occurs when the conventional absolute time expression is used as it is. That is, under the absolute time expression of up to 99:59:74 frames, it is impossible to cope with a large-capacity high-density disc.

In order to solve this problem, in the case of a high-density disc, it is conceivable to use time information capable of expressing a large-capacity address. This time information is
This is different from the time information recorded on the existing disc. As described above, it is necessary to appropriately perform processing when time information of different formats is mixed. For example, although the time information is usually displayed, it is desirable that the time information of the high-density disc can be displayed by a method with less discomfort than the display of the time information of the existing disc.

In addition, it is important to quickly determine the type of the disc mounted on the reproducing apparatus, such as whether the disc is a normal disc or a high-density optical disc. It is. That is, if the type of the disk cannot be determined prior to the demodulation processing of the data recorded on the optical disk, it is not clear how to perform the internal processing of the device depending on the type of the disk or the setting of the dedicated hardware. The number of times increases, and it becomes necessary to perform a complicated disk determination process. In order to avoid such a situation, it is necessary to determine whether the optical disc is a conventional one or a high-density optical disc or the like.
There has been a strong demand for a method of making a determination without imposing a load on the playback device.

Accordingly, an object of the present invention is to provide a disk-shaped recording medium, a data recording apparatus and a method which are effective when different types of time information or addresses are mixed.
Another object of the present invention is to provide a data reproducing apparatus.

[0009]

According to the first aspect of the present invention, there is provided a CD-ROM.
A disc-shaped recording medium on which information is recorded in a recording format based on the format has a sub-code area in which a sub-code is recorded as additional information, and the sub-code area is used for recording information recorded on the disc-shaped recording medium. It has a Q channel for indicating position and recording address information including absolute time information indicated by units of "hour", "minute", "second", and "frame". The Q channel is based on a CD format. In addition, the zero data area in the Q channel is a disk-shaped recording medium having an AHOUR area in which time information indicated by a unit of "hour" of the absolute time information is recorded.

According to a fourteenth aspect of the present invention, there is provided a data recording apparatus for recording main data and time information attached to the main data on a recording medium, comprising: an identification unit for identifying a type of the recording medium; Data conversion means for switching the format of the time information to be output according to the type of the recording medium, and recording means for recording the time information output from the data conversion means together with the main data on the recording medium. It is a data recording device provided.

According to a twenty-fourth aspect of the present invention, there is provided a data recording method for recording main data and time information attached to the main data on a recording medium. Of the time information represented in a plurality of different formats, the time information in the first format is converted into the time information in a second format different from the first format, and the converted time information is converted together with the main data. This is a data recording method for recording on a recording medium.

The invention according to claim 30 is a data recording method for recording main data and time information attached to the main data on a recording medium, wherein the type of the recording medium is identified, and the data is mutually determined according to the type of the recording medium. Generate time information selected from time information represented by a plurality of different formats,
This is a data recording method in which the generated time information is recorded on a recording medium together with main data.

A thirty-sixth aspect of the present invention is a data reproducing apparatus for reproducing a recording medium on which main data and time information attached to the main data are recorded, comprising: an identification unit for identifying a type of the recording medium; Pickup means for reading the time information recorded on the recording medium, demodulation means for switching the format of the time information output from the pickup means according to the type of the recording medium, and reproduction of the time information output from the demodulation means Or, a data reproducing apparatus comprising a reproducing means for displaying.

According to the present invention, expansion of the expression of the time information, recording of discrimination information relating to the disc type, etc. are performed by using the area of relatively low importance in the area where the additional information is recorded. It can be carried out. Further, when it is possible to reproduce a plurality of types of data recording media, it is possible to avoid a problem that display of time information is mixed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described. FIG. 1 shows an example of a configuration of an optical disk player as a reproducing apparatus according to the first embodiment of the present invention. Reference numeral 1 denotes an optical disk, for example, a CD. The optical disk 1 is driven to rotate by a spindle motor 2.
The optical pickup 3 irradiates the optical disk 1 with laser light to receive reflected light, obtains a read signal based on the received reflected light, and supplies the read signal to an RF (Radio Frequency) amplifier 4. The laser beam intensity is indicated by an AP (not shown).
Optimized by C (Automatic Power Control).
The RF amplifier 4 performs processing such as gain adjustment on the supplied read signal. The output of the RF amplifier 4 is the servo circuit 5, E
It is supplied to the FM demodulation circuit 6.

The EFM demodulation circuit 6 uses the optical disc 1
In the case of, the EFM (Eight to Fo
urteen) Performs demodulation processing corresponding to modulation. The output of the EFM demodulation circuit 6 is supplied to a subcode demodulation circuit 7 and a CIRC error correction circuit 8. The CIRC error correction circuit 8 converts the output of the EFM demodulation circuit 6 into a CIRC (Cr
oss Interleave Reed-Solomon Code)
Generate error-corrected decoded data. The processing of the CIRC error correction circuit 8 proceeds while exchanging data with the memory 9. The output of the CIRC error correction circuit 8 is supplied to a data interpolation circuit 10. The data interpolation circuit 10 performs an interpolation process on the output of the CIRC error correction circuit 8. The output of the data interpolation circuit 10 is supplied to a D / A conversion circuit 11. The D / A conversion circuit 11 performs D / A conversion on the output of the data interpolation circuit 10 to convert the output into an analog signal for driving a configuration (not shown) for generating a sound such as a speaker, and outputs the analog signal.

On the other hand, the servo circuit 5 generates a tracking error signal, a focus error signal, a spindle error signal and the like based on the output of the RF amplifier 4.
The tracking error signal and the focus error signal are supplied to the optical pickup 3. The spindle error signal is supplied to the spindle motor 2. Based on these signals, the optical pickup 3 and the spindle motor 2
Operates to keep the read signal good.

The subcode demodulation circuit 7 demodulates the subcode information output from the EFM demodulation circuit 6 and supplies the demodulated subcode information to the system controller 12. The system controller 12 controls the operation of each component in the apparatus such as the servo circuit 5 and displays a song number, a relative time, and the like on the display unit 13 based on the subcode information supplied from the subcode demodulation circuit 7. Let it.
Also, discrimination information and the like relating to the type of the optical disc 1 such as whether or not it is a high-density optical disc is detected from the subcode information, and the operating conditions and the like of the apparatus are controlled based on the detected discrimination information and the like. . The operation unit 14 is configured to allow the user to perform various inputs, such as playing methods such as start, stop, pause, repeat, and random play.

Next, in order to facilitate understanding of the present invention, a general frame format of a CD will be described with reference to FIG. In one frame, a frame synchronization signal of 24 channel bits, one symbol, that is, a subcode of 14 channel bits, 12 symbols, that is, data of 12 × 14 = 168 channel bits, and 4 symbols, that is, parity of 4 × 14 = 56 channel bits, The set is recorded twice. Also,
Between the frame synchronization signal and the subcode, between the subcode and the data of the first one symbol, and between the data or parity of each one symbol, three channel bits are combined. The total number of combined bits is 34
× 3 = 102 channel bits, and one frame is composed of 588 channel bits in total.

Since one frame corresponds to six sample periods, the frame period is 44.1 / 6 = 7.35 kHz. Since 588 channel bits are included per frame, the reproduction clock is 7.35 × 588 = 4.3.
218 MHz.

As shown in FIG. 3, 98 frames are a group of information (subcode frame) composed of frame synchronization information, subcode information, data and parity information.
To form The subcode data in 98 frames expresses the subcode information as one block. Such a block will be described with reference to FIG. The sub-codes of the first frame F1 and the second frame F2 are fixed synchronization patterns S0 = 001000, respectively.
00000001, S1 = 0000000001001
0 is recorded. As S0 and S1, a pattern that cannot appear in the EFM modulation is used, whereby the start position of the block related to the subcode information is specified at the time of reproduction.

The sub-codes of the 96 frames of the third frame F3, the fourth frame F4,..., The 97th frame F97, and the 98th frame F98 are respectively P1, Q1, R1, S1, T1, U1, V1,
W1, P2 to W2, ‥‥, P95 to W95, P96 to W
96 are recorded. And P1, P2, ‥‥, P
96, Q1, Q2, ‥‥, Q96, R1 to R96, S1
S96, T1 to T96, U1 to U96, V1 to V9
6, W1 to W96 each form a complete information channel.

The sub-code information includes (1) information relating to a program function such as locating a music piece and playing back the music in a preset order, and (2) additional information such as text information. I have. The subcode P channel and Q channel are used as the information of (1),
The subcode R channel to W channel are used as the information of (2). The P channel is used between songs (pau
se), which is information used for rough cueing. The Q channel is information for finer control.

FIG. 5A shows an example of the contents of Q1 to Q96. 4 bits of Q1 to Q4 are control area CONT
ROL, and four bits Q5 to Q8 are address area A.
DR. In the program area, the address is 00
01 is set. The 72 bits Q9 to Q80 are divided into areas of every 8 bits, and in this order, a track number area TNO, an index area INDEX, a minute MIN,
Relative time (elapsed time in movement) area consisting of seconds SEC, frame FRAME, zero data area ZERO, minutes AMI
An absolute time area in the disc consisting of N, second ASEC, and frame AFRAME is sequentially recorded. Also, Q8
CRC (Cyclic Redundancy) is stored in 16 bits of 1 to Q96.
Check code) is recorded.

The CONTROL records information such as the number of channels of audio data, emphasis, and whether the disk is a CD-ROM on which audio data is recorded or a computer or the like is recorded. That is, as shown in FIG.
When 4 bits in L are 00x0, 2-channel audio data without pre-emphasis, when 10x0, 4-channel audio data without pre-emphasis, and when 00x1, a time constant of 50 μs or 1
2-channel audio data with pre-emphasis of 5 μs, time constant of 50 μs or 1 for 10 × 1
This indicates that the audio data is 4-channel audio data with pre-emphasis of 5 μsec. Also, CONT
When 4 bits in the ROL are 01x0, it indicates that the track is used as data storage. When four bits in CONTROL are xx0x, it indicates that digital copying is prohibited, and when these four bits are xx1x, it indicates that digital copying is permitted. .

CD-R defined on CD format
FIG. 6 shows an example of a recording format in the OM. In this case, one subcode frame, that is, data for 98 frames is treated as a sector which is the minimum unit in recording and reproducing information. Since 24 bytes of data are secured in one frame, 2352 bytes are stored in one sector. 1 at the beginning of each block (sector)
2-byte fixed pattern 00 FF FF FF FF FF FF FF FF F
F FF 00h is recorded, and this is a synchronization pattern. The 4 bytes following the periodic pattern are a header, and are composed of an absolute time recorded in the subcode Q and a signal indicating the mode. There are three types of modes depending on the recording content following the header. In mode 1, 2
048 bytes of data, 4 bytes of CRC data and 8 bytes of 0 data, 172 bytes of P-parity, 104
Byte Q-parities are recorded in order.

In the mode 1 of mode 2, an 8-byte subheader, 2048-byte data, 4-byte CRC data, 172-byte P-parity, and 104-byte Q-parity are recorded in this order. Mode 2
In Form 2, an 8-byte subheader, 2324-byte data, and 4-byte CRC data are sequentially recorded.

In the BCD expression in the MSF format as described above, a maximum of 99 minutes 59 seconds 74 frames (about 900 M
B) can be expressed. However, normal CD, CD
When considering a high-density optical disk having a recording capacity twice or three times as large as that of -R, CD-RW, etc., a problem that an absolute time (address) corresponding to the recording capacity cannot be expressed. There is. According to the present invention, the absolute time expression is extended by changing the recording content of the Q channel of the subcode in order to cope with an increase in capacity. To increase the recording capacity, narrow the track pitch,
The linear density is made higher. By both,
Even if the physical dimensions such as the diameter are the same as the CD, the recording capacity can be almost doubled.

In the Q channel of the subcode described above with reference to FIG. 5, the relative time area and the zero data area ZERO following the relative time area do not have much important information in performing the actual reproduction process. That is, the relative time is subtracted between songs (between pauses) and starts at zero at the beginning of each song, but this information can be calculated from other information. That is, in the absolute time domain (AMIN, ASEC, AFRAME), the first
The position where the pause of the song starts is set to '0', and the absolute time on the disk which is incremented thereafter is recorded. In addition to this information, the P channel of the subcode and the index area Index of the subcode Q
Since the use section can be known, the relative time can be easily calculated based on such information.

Since the processing capability of the control microcomputer of the player was small at the beginning of the development of the CD, the relative time recorded in the CD can be read and displayed as it is so that the relative time is added to the subcode. Although it was effective to record, as a result of the remarkable improvement in the processing capability of the control microcomputer, there is almost no need to record the relative time in a subcode such as a CD. Also,
Only "0" is recorded in the zero data area ZERO, and this area may be used as a laser power calibration area for a CD-R or a CD-RW. not being used.

Therefore, it is considered effective to record various kinds of additional information in the relative time area of 24 bits and the 32 bits of the zero data area ZERO. In the present invention, such an area is used to expand an absolute time area which is insufficient due to an increase in the capacity of the optical disk.

FIG. 7 shows a first embodiment of the present invention in which the area of the order of "minutes" of the absolute time is extended using the zero data area ZERO. Here, "100" is used by using the lower 4 bits of the 8-bit zero data area ZERO.
The "minute" digit is represented by a BCD code. Thus, the absolute time up to 999: 59: 74 frame can be expressed. As will be described later, for example, identification information or the like indicating that the optical disk is a high-density optical disk may be expressed by using the upper 4 bits in the zero data area ZERO.

Next, a second embodiment of the present invention, in which a region of the order of "minutes" of absolute time is extended using a relative time region, will be described with reference to FIG. Here, 2
The lower 100 bits of the 4-bit relative time area are used to represent the "100 minutes" digit by the BCD code. Thus, the absolute time up to 999: 59: 74 frame can be expressed. Alternatively, other information may be expressed using the upper 20 bits in the relative time domain. An optical disk reproducing apparatus according to another embodiment of the present invention is the same as the optical disk reproducing apparatus according to one embodiment of the present invention described above with reference to FIG.

Next, FIG. 9 shows a third embodiment of the present invention in which the digits of the "hour" of the absolute time are created using the zero data area ZERO. The "hour" digit is created using the four bits of the zero data area. Thereby, 9 hours 59
Time information up to minutes 59 seconds 74 frames can be described.

More specifically, as shown in FIG. 10, the eight bits of the zero data area ZERO are divided into four bits, and the upper four bits are used to indicate the relative time "hour" digit (HOU).
R), and the lower 4 bits are assigned to the "hour" digit (AHOUR) of the absolute time. As described above, the relative time information is less important, so in the case of a high density disc,
No time information is recorded, and these areas are FF FF
FF Set to Fh. The hour digit of the absolute time is
0 to 9 BCD expressions. In a high-density disc, as an example, the absolute time is set at 0: 09: 30: 30 frame at the start position of the lead-in area and at 0: 12: 00: 00 frame at the start position of the program area. I have. Thus, the zero data area ZE
By allocating the lower 4 bits of the RO to the absolute time "hour", it is possible to handle the data from the "hour" digit to the "frame" digit of the absolute time as a series of data.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the third embodiment shown in FIG. 9, the digits of "hour" move up in units of 60 minutes. On the other hand, in the fourth embodiment, 8
If the time is less than 0 minutes, the "hour" digit is not used, and if the time is 80 minutes or more, the "hour" digit is used. In other words, until the 79:59:74 frame, the next absolute time is 1 hour, 20:00, 00:00, without using the hour digits.
It is a frame and uses the hour digits thereafter. However, the delimiter time can be set within a range of about several minutes around 80 minutes. For example, from 81 minutes, 1 hour 2
It may be 1 minute 00 seconds 00 frames. Furthermore, "80
“Minute” may be replaced with “90 minutes”.

In existing CDs, CD-Rs, and CD-RWs, the maximum recording time is almost "80 minutes". In rare cases, there are some that exceed "90 minutes". In the lead-in area, time information of the order of 90 minutes is used. Therefore, the minute digit is set to less than 90 minutes. An optical disk reproducing apparatus according to another embodiment of the present invention is the same as the optical disk reproducing apparatus according to one embodiment of the present invention described above with reference to FIG.

In addition to the above-described first to fourth embodiments of the present invention, an absolute time expression method suitable for various situations, for example, matching daily time recognition and editing convenience. Can be realized by the present invention.

Next, the identification information of the high-density optical disk will be described. Normal CD or CD-
By recording information different from R and CD-RW or a pattern that should not be recorded on a normal CD or the like as identification information, the optical disc device can promptly detect such identification information, The reproduction processing of the high-density optical disk can be started. For example, the subcode Q
A method is conceivable in which an arbitrary bit in the zero data area ZERO in the channel is set to '1' and used as an identifier. In the first to fifth embodiments of the present invention described above,
A method is conceivable in which bits not used for expressing the absolute time, for example, bit 7 of the zero data area ZERO is set to '1' and used as an identifier.

When the high-density disk has a multilayer structure, a layer number may be assigned to each layer, and the layer number may be extended to empty bits such as the upper 4 bits of the zero data area ZERO. In this case, the drive can easily identify which layer is being reproduced based on the data in the area. In addition, it is possible to easily calculate a moving distance and a moving direction when the optical pickup is moved from the currently reproduced layer to another layer.

When the high density optical disc has different recording densities in the same recording layer, the zero data area Z
Useful bits such as the upper 4 bits of ERO can be used to record useful information for disc access. For example, when the inner circumference has a track pitch of 1.6 μm as in a normal CD, and the track pitch is 1.1 μm from the middle or outer circumference, information on such a change in track pitch is used by using the empty bit. By performing the recording, it is possible to accurately move the pickup. Further, for example, by recording additional information such as '01' in the lead-in area, '10' in the program area, and '11' in the lead-out area, the position of the optical pickup can be quickly determined with some accuracy. It becomes possible to grasp.

By recording some additional information as described above in, for example, the upper 4 bits such as the upper 4 bits of the zero data area ZERO, the zero data area ZERO is recorded.
If a bit other than '0' is detected in O, the drive
It is possible to identify that the disc has a recording format different from that of a normal CD or the like.

In addition, various additional information can be recorded in an area where relatively insignificant information is recorded, such as a zero data area ZERO and a relative time information area. For example, in a normal CD, some information may be expressed by recording data that is clearly not time information in an area where time information is recorded. For example, 'FFFFFh' can be used as such data.

In a high-density optical disc, when binary representation is performed in the relative time domain instead of BCD MSF representation, each digit represented by 4 bits is not BCD representation corresponding to 0-9. , 0-A, B,
Travel to C, D, E, F. So, in the playback device,
When the states A to F are detected, it can be determined that the mounted optical disk is not a normal optical disk such as a CD but a high-density optical disk. In this case, the apparatus can determine whether the optical disk is a normal optical disk or a high-density optical disk by monitoring the Q channel in at least 11 subcode frames.

According to one embodiment of the present invention, information different from information in a frame format such as a normal CD is recorded in a zero data area and / or a relative time area in a Q channel of a subcode. It is intended to more appropriately express absolute time, information on the type of disc, and the like. On the other hand, other areas, for example, the track number area TNO and the index area INDEX in the Q channel of the subcode (FIG. 5A
For example, by recording information different from information in a frame format of a normal CD or the like, the absolute time and the like may be expressed more appropriately.

Although the above description has been made mainly with a CD as an example, the present invention is applied to an optical disc on which subcode information similar to a CD such as a CD-R or CD-RW is recorded. Can be. Further, in general, the present invention can be applied to a recording medium on which information useful for a user and additional information related to the information are recorded.

In the CD-ROM, in addition to the subcode, address information is recorded in the main data as a header. Furthermore, on recordable optical disks such as CD-R and CD-RW, address information is recorded in advance. As a recording method, the wobbling groove has FM
A method of recording address information by modulation (ATIP (A
bsolute Time In Pre-groove) is used. These pieces of address information are recorded in synchronization with the subcode. In existing recordable optical discs, address information is recorded as time information. When a recordable optical disk is increased in density, it is necessary to devise these pieces of address information so that more data addresses can be expressed. More specifically, a high-density disk can be handled by expressing the address information in a binary number.

One ATIP frame has a length of 42 bits, the first 4 bits are a sync pattern, the next 24 bits are an address notation part, and the last 14 bits are a CRC. In a high-density disk, a 24-bit address notation is expressed in binary (binary number). If all 24 bits are expressed in binary address, 2 ²⁴ = 16777216, so if the data amount of one frame is 2K bytes,
Addressing of data up to about 33 Gbytes is possible, and it is possible to cope with high density. Some of the 24 bits (1, 2, 3, or 4 bits) may be used for identification to record information other than address information.

As described above, since a plurality of formats exist as subcodes or address information,
It is preferable to record or reproduce data in consideration of this point. FIG. 12 shows a first example of a recording apparatus to which the present invention is applied to a mastering apparatus for a read-only optical disk such as a CD and a CD-ROM.

A recording device (mastering device) shown in FIG. 12 is a laser 21 which is a gas laser or a semiconductor laser such as an Ar ion laser, a He-Cd laser or a Kr ion laser, and a laser beam emitted from the laser 21. An acousto-optic effect type optical modulator 22 for modulating, and a disk-shaped glass master 2 on which a laser beam that has passed through the optical modulator 22 is condensed and coated with a photoresist as a photosensitive material.
4 has an optical pickup 23 which is a recording unit having an objective lens and the like for irradiating the photoresist surface.

The light modulator 22 operates according to the recording signal.
The laser light from the laser 21 is modulated. Then, the mastering device transmits the modulated laser beam to the glass master 2.
By irradiating No. 4, a master on which data is recorded is created. Further, the optical pickup 23 is moved to the glass master 2
A servo circuit 26 is provided for controlling the distance from the spindle motor 4 to be constant, controlling the tracking, and controlling the rotation driving operation of the spindle motor 25. The glass master 24 is rotationally driven by a spindle motor 25.

The recording signal from the recording signal generator 27 is supplied to the optical modulator 22. The recording signal generator 27 includes:
The recording data 28 and the subcode selected by the switch circuit 30 are supplied. The switch circuit 30 has two input terminals 31a and 31b. Subcode generator 29
Are supplied to these input terminals. The subcode generator 29 generates different types of subcodes and supplies them to the input terminals 31a and 31b of the switch circuit 30, respectively.

For example, a mastering device is used for both normal (existing) CD and mastering of a high-density disc.
The subcode generator 29 supplies the subcode in the MSF format to the recording signal generator 27 via the input terminal 31a in the case of CD mastering. In the case of mastering a high-density disc, for example, an H (hour) MSF format subcode is supplied to the recording signal generator 27 via the input terminal 31b. Further, the system controller 32 controls the servo circuit 26 to control the track pitch and the linear velocity. The system controller 32 switches the track pitch and linear velocity between a normal CD and a high-density disk. Further, the controller 32 controls the entire operation of the mastering device.

The recording signal generator 27 converts the recording data 28 and the subcode passed through the switch circuit 30 into data in a CD format or high-density disk format. That is, in any format, basically, error correction coding processing and scramble processing are performed, and further, EFM (Eight to Fourteen Modulati
on). In the case of a high-density disc, data is recorded, for example, in a CD-ROM format. The recording data 28 is linear PCM audio data in the case of a CD. In the case of a high-density disc, it is uncompressed data or compressed data.

Further, medium information indicating the type of the recording medium is recorded in a predetermined area such as a lead-in area and a lead-out area of the disc. At the time of recording,
The switch circuit 30 and the recording signal generator 27 are controlled by the medium information 35 generated by the system controller 32. Display unit 3 in relation to system controller 32
3 and an operation unit 34 are provided.

The glass master 24 recorded by the above-described mastering device is developed and electroformed to form a metal master. Next, a mother disk is formed from the metal master, and then a stamper is formed from the mother disk. Is created. Using a stamper, a CD or a high-density disc is produced by a method such as compression molding, injection molding or the like. As described above, the recording (mastering) apparatus shown in FIG. 12 can be used for both the existing CD and the high-density disc by switching between the generation of the subcode and the recording signal generation processing.

FIG. 13 shows a second example of the recording apparatus. The optical disc 41 is a recordable disc, and has an existing C
D-R, CD-RW, and high-density discs can be used. The spindle motor 42 for rotating the optical disk 41 and the optical pickup 43 are servo-controlled. The input data from the input terminal 44 is supplied to the data converter 45, and the recording signal from the data converter 45 is supplied to the recording circuit 46. The output signal of the recording circuit 46 is supplied to the optical pickup 43 and recorded on the optical disk 41.

When the optical disk 41 is loaded, the medium information is read from a predetermined area. The read medium information is supplied to the medium identification unit 47. The medium identification unit 47
An identification signal indicating whether the optical disk 41 is of a standard recording density (existing) or a high density type is generated. This identification signal is supplied to the data conversion unit 45, and signal processing is performed according to the type of the optical disk. Although not shown, servo control is also performed based on the medium information.

The input data from the input terminal 44 is reproduction data of an existing optical disk or high-density disk, and includes a subcode. For example, input data is supplied via an interface such as IEC958. Therefore, in the data conversion section 45, if the optical disk that has generated the input data and the optical disk 41 to be recorded are of the same type, no further signal processing is performed. On the other hand, if the optical disk that has generated the input data and the optical disk 41 are of different types, subcode conversion processing is performed, and if necessary, conversion processing of recording data is performed. For example, if the input data is CD playback data,
If the optical disc 41 is a high-density disc, the data conversion unit 45 converts the subcode of “74:05:15 frame” in the input data into “1: 14: 05: 15 frame”.

FIG. 14 shows a third example of the recording apparatus. The optical disk 41 is a recordable disk, and an existing optical disk or high-density disk can be used. That is, in FIG. 14, the type of the optical disk 41 is fixed. The spindle motor 42 for rotating the optical disk 41 and the optical pickup 43 are servo-controlled. The input data from the input terminal 44 is supplied to the data converter 45, and the recording signal from the data converter 45 is supplied to the recording circuit 46. The output signal of the recording circuit 46 is supplied to the optical pickup 43 and recorded on the optical disk 41.

The input data from the input terminal 44 is reproduction data of an existing optical disk or high-density disk, and includes data type information and a subcode.
Therefore, the data type discriminating section 48 can discriminate whether the optical disc that has generated the input data is an existing optical disc or a high-density disc. The determination result is supplied to the data conversion unit 45. If the optical disk 41 used as the recording medium and the disk that has generated the input data are of the same type, the data conversion unit 45 does not perform the subcode conversion process. On the other hand, if the optical disk that has generated the input data and the optical disk 41 are of different types, subcode conversion processing is performed, and if necessary, conversion processing of recording data is performed.

FIG. 15 shows a fourth example of the recording apparatus. The optical disk 41 is a recordable disk and has a CD-R
And other existing optical disks or high-density disks can be used. Which disk is used is
The medium identification unit 47 makes a determination based on the medium information. Also,
The input data is reproduction data of an existing CD-ROM or reproduction data of a high-density disc. Existing CD-RO
Address information expressed in the MSF format is included in the reproduction data of M as a header. The reproduced data of the high-density disc includes, as a header, address information expressed in a binary number format. The type of input data is
The determination is made by the data type determination unit 48.

The identification information from the medium identification section 47 and the identification data from the data type identification section 48 are converted into header conversion sections 49
Supplied to The header conversion unit 49 determines whether the type of the input data and the type of the optical disk 41 match or does not match from both pieces of information, and converts the data format of the header according to the type of the optical disk 41. If they match, the header is not converted. For example, the input data is an existing CD-ROM and the optical disk 41
Is a high-density disk, the address in the MSF format is converted to an address in binary notation.

According to the recording apparatus described above, an existing CD,
Data authored by an optical disk such as a CD-ROM can be diverted or recorded on a high-density disk only by converting time information. Conversely, data authored by a high-density disk can be diverted or recorded on an existing disk only by converting time information. Furthermore, not only subcodes, but also CD-
It is possible to cope with the difference in the format of the address information of the ROM.

FIG. 16 shows the structure of a reproducing apparatus according to the present invention. The optical disk 51 is an existing disk or a high-density disk. The optical disk 51 is rotated by a spindle motor 52, and a recording signal on the optical disk 51 is read by an optical pickup 53. The read signal is supplied to the RF amplifier 54. RF amplifier 5
4 is supplied to an error correction circuit 59 through an EFM demodulator 55. The error correction circuit 59 corrects the error. A digital output is output from the error correction circuit 59 to an output terminal 60. An analog output is output to an output terminal 62 by passing the digital output through the D / A converter 61.

A sub-code demodulation section 56 and a medium identification section 57 are connected to the RF amplifier 54. The time display unit 58 is connected to the subcode demodulation unit 56. The time display unit 58 displays the time based on the demodulated subcode. The medium identification unit 57 identifies whether the optical disk 51 is an existing disk or a high-density disk. The identification result of the medium identification unit 57 is
5, the sub-code demodulation unit 56, the time display unit 58, and the error correction circuit 59. Thereby, signal processing corresponding to the type of the optical disc 51 is performed.

The time display section 58 prevents the time display from being changed due to the difference in the type of the optical disk to be reproduced, and performs a unified time display. For example, if the value of “minute” exceeds 60 minutes in accordance with the subcode of the high-density disc, the display is for one hour. Thereby, regardless of the type of the optical disc 51, the time display can be made common. As another method of displaying the time, there is a method in which the time is displayed on a CD even if the optical disk 51 to be reproduced is a high-density disk. That is, 8
If the time is less than 0 minutes (or 90 minutes), the time is displayed in minutes, and if it is 80 minutes (or 90 minutes) or more, the time is displayed. According to another method, the time display can be the same as that of an existing CD, and the user can be prevented from feeling uncomfortable.

FIG. 17 shows an example of the configuration of a drive of a recordable (recordable or rewritable) optical disk. 71
Is a disk, for example, a high-density disk. Existing recordable optical disks (CD-R, CD-RW) can also be used. The disk 71 is driven to rotate by a spindle motor 72. In order to record data on the disc 71 and reproduce the data from the disc 71,
An optical pickup 73 is provided. The optical pickup 73 is fed in the disk radial direction by a feed motor (not shown).

For example, the disk 71 is a phase-change type disk that can be recorded by a laser beam and can be reproduced by detecting a difference in the amount of reflected light. The material of the substrate on which the recording film is applied is polycarbonate, and track guide grooves called grooves are formed on the substrate by injection molding in advance. It is also called a pregroove because it is formed in advance. The area between the grooves is called a land. The groove is
It is formed continuously in a spiral shape from the inner circumference to the outer circumference. The present invention can be applied to a magneto-optical disk and a write-once disk using an organic dye as a recording material as long as recording is possible.

The groove is meandering (referred to as wobble) for controlling the rotation of the disk and as a reference signal for recording. Data is recorded in the groove or in the groove and land. Further, address information is continuously recorded as groove wobble information. The optical pickup is positioned at a desired write position with reference to an address obtained by wobble information, and data is written to a disk.

The data to be recorded is stored in the interface 74.
To the drive. Interface 74
SCSI (Small Computer System Interface)
, ATAPI (AT Attachment Packet Interface) and the like can be used. The memory 75 is connected to the interface 74. The recording data via the interface 74 is supplied to the CD-ROM encoder 76,
OM format data is generated. CD-ROM
The output of the encoder 76 is CIRC (Cross Interleaved R).
eed Solomon Code) Encoding and EFM modulator 77
Supplied to In this block 77, a subcode similar to the ATIP is generated.

CIRC encoding and EFM modulator 7
The output of 7 is supplied to the write signal generator 78, and a write signal is generated. Write signal is laser driver 7
The output of the laser driver 79 is supplied to the optical pickup 73. Thus, data is recorded on the disk 71.

The data on the disk 71 is reproduced by the optical pickup 73, and the signal detected by the photo detector is supplied to the RF signal processing section 81. RF signal processing unit 8
In 1, the matrix amplifier generates a reproduction (RF) signal, a wobble signal, a tracking error signal TE, and a focus error signal FE by calculating a detection signal of the photodetector. The RF signal is supplied to a CIRC decoding and EFM demodulation unit 82, a wobble signal obtained as a push-pull signal is supplied to an ATIP demodulator 84, and a tracking error signal and a focus error signal are supplied to a servo processor 85. Further, a driver 86 for driving each unit according to the output of the servo processor 85 is provided. Servo processor 85
Performs tracking servo and focus servo for the optical pickup 73, spindle servo for the spindle motor 72, and thread servo for the feed motor.

CIRC decoding and EFM demodulating section 82
Then, demodulation of EFM, decoding of an error correction code (that is, error correction), and the like are performed. The output of the block 82 is supplied to the CD-ROM decoder 83,
Output data of the M decoder 83 is output via the interface 74.

The ATIP demodulator 84 supplies the wobble signal to the FM demodulator via a band-pass filter that allows only the vicinity of the carrier frequency (22.05 kHz) to pass to obtain a biphase signal. Further, a clock extracted from the bi-phase signal is used for controlling the spindle motor 72, and address data in the bi-phase signal is extracted with the clock. The address from the ATIP demodulator 84 is supplied to the system controller 80, and the system controller 80 controls the seek operation using this address. The system controller 80 includes an interface 74, a CD-ROM encoder 76 / decoder 8
3, CIRC encoding and EFM modulator 77, CI
It controls the RC decoding and EFM demodulation unit 82, the RF signal processing unit 81, the servo processor 85, and the like.

The disk 71 has address information (binary notation for a high-density disk, MS for an existing disk).
In order to continuously preformat (F format), the groove which is the guide groove of the laser beam is wobbled, and address information is continuously recorded as wobble information.
Data is written to the disk with reference to the address information obtained from the wobble information. This wobble data is
Actually, a signal frequency-modulated by a carrier of 22.05 kHz is contained, and by demodulating this signal,
We try to get address information. This address information is called ATIP, and indicates an absolute address on the disk.

The recording apparatus shown in FIGS. 13, 14, and 15 and the reproducing apparatus shown in FIG. 16 can be realized in the disk recording / reproducing apparatus shown in FIG.

For example, a case where the recording apparatus shown in FIGS. 13 and 15 is applied to the disk recording / reproducing apparatus shown in FIG. 17 will be described below.

When the disk 71 is mounted on the drive,
Data in a predetermined area on the disk 71, for example, a lead-in area, is reproduced by an optical pickup 73 as the optical pickup 43 shown in FIG. The reproduced signal is transmitted to the RF signal
The push-pull signal is supplied to the IRC decoding and EFM demodulation unit 82, and the push-pull signal is supplied to the ATIP demodulator 84. At this time, if the disk 71 is a high density disk,
A part of the subcode (Q channel) demodulated by the subcode demodulator included in the CIRC decoding and EFM demodulation unit 82 is, for example, as shown in FIG. 10, a subcode in the existing CD frame shown in FIG. Therefore, it can be used as an identification signal indicating the type of the optical disk.

That is, the CIRC decoding and EFM demodulating section 82 outputs the identification signal and supplies the identification signal to the system controller 80, so that the system controller 80 can operate the medium identification section 4 shown in FIG.
7 operates. Based on the supplied identification information, the system controller 80 determines whether the loaded disk 71 is an existing optical disk corresponding to the CD format or a high-density disk corresponding to a new format defined based on the CD format. The data conversion unit 45 shown in FIG. 13 performs CIRC encoding and EFM modulation so that decoding / encoding processing of a subcode and encoding / decoding processing of an error correction code correspond to each type of an optical disk. Unit 77, CIRC decoding and EFM demodulation unit 82
Switch the operation of.

The detection of the type of the optical disk based on the identification signal can also be realized by the system controller 80 identifying the address information output from the ATIP demodulator 84. That is, the existing optical disk is A
As address information included in the TIP, minutes (MIN),
While seconds (SEC) and frame numbers (FRAME) are each represented by a BCD code, on a high-density disc, address information is represented by a 24-bit binary number. For this reason, the disc type can be recognized by the system controller 80 identifying the difference in the address information from the ATIP demodulator 8.

Further, when the type of the disc 71 is identified by the system controller 80, the system controller 80 operates the CD-ROM encoder 76,
When processing the recording data input via the interface 74 into data in the CD-ROM format,
A header (see FIG. 6) corresponding to each disc is added.
That is, the system controller 80 controls the CD-ROM encoder 7 as the header conversion unit 49 shown in FIG.
6 by giving the disc identification result to the CD-R
The OM encoder 76 controls to switch the data format of the address information included in the header. In addition,
As a matter of course, the system controller 80 switches the decoding process of the CD-ROM format including the header by operating the CD-ROM decoder 83 according to the type of the disc.

The present invention is not limited to the above-described embodiment of the present invention, and various modifications and applications can be made without departing from the gist of the present invention.

[0084]

According to the present invention, the normal C data is stored in the zero data area or the relative time area in the Q channel of the subcode.
By recording information different from the information in the frame format such as D, the absolute time, the information on the disc type, and the like are more appropriately expressed. As a result, even when the absolute time exceeds 99 minutes 59 seconds 74 frames in a high-density optical disk or the like with a large capacity, appropriate absolute time expression can be performed.

Further, according to the present invention, the time digit is not used for a predetermined time (80 minutes or 90 minutes), and the time digit is used for a predetermined time or more.
It is possible to increase the density while maintaining consistency with the time expression in a medium such as D.

Further, according to the present invention, the conversion of the time information makes it possible for the existing medium and the high-density medium to mutually enter the data, so that the authored data can be easily diverted and recorded. .

Further, according to the present invention, by recording information relating to discrimination of the disc type, such as whether the disc is a high-density optical disc or a normal optical disc, on the disc, the reproducing apparatus can determine the disc type. The determination can be easily performed, which contributes to a reduction in the load on the apparatus and a reduction in processing time.

If the disc has a multi-layer structure, a single-layer structure, or a multi-layer structure, information such as which recording layer the currently accessed frame is located on, and the track pitch By recording information on the disc on the disc, it is possible to contribute to the efficiency of disc access during reproduction.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a disk drive to which the present invention is applied.

FIG. 2 is a schematic diagram for explaining a frame format in a CD.

FIG. 3 is a schematic diagram illustrating a format of a subcode frame in a CD.

FIG. 4 is a schematic diagram for explaining a subcode format in a CD.

FIG. 5 is a schematic diagram for explaining a Q channel of a subcode.

FIG. 6 is a schematic diagram for explaining a recording format of a CD-ROM.

FIG. 7 is a schematic diagram for explaining the expression of an absolute time in the first embodiment of the present invention.

FIG. 8 is a schematic diagram illustrating an expression of an absolute time according to the second embodiment of the present invention.

FIG. 9 is a schematic diagram illustrating an expression of an absolute time according to a third embodiment of the present invention.

FIG. 10 is a schematic diagram for explaining a format of a subcode according to a third embodiment of the present invention.

FIG. 11 is a schematic diagram illustrating an expression of an absolute time according to a fourth embodiment of the present invention.

FIG. 12 is a block diagram illustrating a first example of a recording apparatus to which the present invention has been applied.

FIG. 13 is a block diagram illustrating a second example of a recording apparatus to which the present invention has been applied.

FIG. 14 is a block diagram illustrating a third example of a recording apparatus to which the present invention has been applied.

FIG. 15 is a block diagram showing a fourth example of a recording apparatus to which the present invention has been applied.

FIG. 16 is a block diagram illustrating an example of a playback device to which the present invention has been applied.

FIG. 17 is a block diagram showing a configuration of an example of a disk recording / reproducing apparatus to which the present invention can be applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... CD, 3 ... Optical pickup, 7 ... Subcode demodulation part, 12 ... System controller

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoichiro Sako 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Tatsuya Inoguchi 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation (72) Inventor Katsumi Toyama 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Shigeki Tsukaya 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F term (reference) 5D044 AB05 BC04 CC06 DE39 DE55 DE75 EF05 FG18 5D077 AA29 AA30 CA02 DC04 EA25 HC03 HC45 5D090 AA01 BB04 CC02 CC05 DD03 FF11 GG17

Claims (46)

[Claims] 1. A disc-shaped recording medium on which information is recorded in a recording format based on a CD format, comprising a subcode area for recording a subcode as additional information, wherein the subcode area is a disc-shaped recording medium. In addition to indicating the recording position of the information recorded in the
A Q-channel for recording address information including absolute time information indicated by each unit of “frame”, wherein the Q-channel is defined based on the CD format and zero data in the Q-channel; A disc-shaped recording medium provided with an AHOUR area in which an area is recorded with time information indicated by a unit of "hour" of the absolute time information. 2. The disk-shaped recording medium according to claim 1, wherein the AHOUR area is assigned to lower 4 bits of 8-bit data forming the zero data area. 3. The absolute time information includes the “hour” and “minute”.
2. The disk-shaped recording medium according to claim 1, wherein each unit of "second" and "frame" is recorded by a BCD code. 4. The absolute time information of the “hour” unit is 10
2. The disc-shaped recording medium according to claim 1, wherein the data is data in units of 0 minutes. 5. The absolute time information in “hour” unit is 60
2. The disk-shaped recording medium according to claim 1, wherein the data is a unit of data. 6. The disk-shaped recording medium according to claim 5, wherein the absolute time information in units of “minutes” is data from 0 to 59. 7. The disc-shaped recording medium according to claim 1, wherein the Q channel has a specific area in which identification data having a pattern that cannot be at least partially shown by encoding in the CD format is recorded. 8. The disk-shaped recording medium according to claim 7, wherein the specific area is a part of the zero data area. 9. The disk-shaped recording medium according to claim 7, wherein the specific area is a relative time area in which relative time information indicating a reproduction elapsed time of each music piece reproduced in the CD format is recorded. 10. The disc-shaped recording medium according to claim 7, wherein the identification data includes recording layer information indicating whether the recording layer formed on the disc-shaped recording medium has a single-layer structure or a multi-layer structure. Medium. 11. The disc-shaped recording medium according to claim 10, wherein the recording layer information indicates which recording layer contains the specific area when the disc-shaped recording medium has a multilayer structure. 12. The disc-shaped recording medium according to claim 7, wherein the identification data includes information indicating a type of the disc-shaped recording medium. 13. The disc-shaped recording medium according to claim 12, wherein the identification data includes identification information indicating that the disc-shaped recording medium is an optical disc having a higher recording density than a CD. 14. A data recording apparatus for recording main data and time information accompanying the main data on a recording medium, comprising: an identification unit for identifying a type of the recording medium; and outputting the time information. Data conversion means for switching the format of the time information output according to the type of the recording medium; and recording means for recording the time information output from the data conversion means together with the main data on the recording medium. A data recording device comprising: 15. The data conversion means includes: first address information represented by a first format corresponding to a CD format; and second address information represented by a second format different from the first format. 15. The disc-shaped recording medium according to claim 14, wherein the information is output and one of the first and second address information is converted into the other according to the type of the recording medium. 16. The first address information includes “minutes”.
The second address information includes absolute time information indicated by each unit of “second” and “frame”, and the second address information includes “hour”, “minute”
16. The data recording apparatus according to claim 15, including absolute time information indicated by each unit of "second" and "frame". 17. The first address information is such that each unit of “minute”, “second”, and “frame” is represented by a BCD code, and the second address information is “hour”.
17. The data recording apparatus according to claim 16, wherein each unit of "minute", "second", and "frame" is represented by a BCD code. 18. The first address information is such that each unit of “minute”, “second” and “frame” is represented by a BCD code, and the second address information is “hour”.
17. The data recording apparatus according to claim 16, wherein each unit of "minute", "second", and "frame" is represented by a binary code. 19. The data recording apparatus according to claim 14, wherein the time information is recorded on a Q channel included in subcode information formed based on a CD format. 20. A first disk-shaped recording medium having a first recording density, wherein said main data and said time information are recorded in accordance with a CD format, and said first recording density. 15. A second disk-shaped recording medium having a higher second recording density and identifying the main data and the time information according to a specific format based on the CD format.
The data recording device according to the above. 21. The time information recorded on the first disk-shaped recording medium includes absolute time information indicated by each unit of “minute”, “second”, and “frame”, and the second disk-shaped recording medium The time information recorded in
21. The data recording apparatus according to claim 20, including absolute time information indicated by each unit of "second" and "frame". 22. The time information recorded on the first disc-shaped recording medium is such that each unit of “minute”, “second”, and “frame” is represented by a BCD code, and is recorded on the second disc-shaped recording medium. The recorded time information is the above "hour"
22. The data recording apparatus according to claim 21, wherein each unit of "minute", "second", and "frame" is represented by a BCD code. 23. The time information recorded on the first disc-shaped recording medium is such that each unit of “minute”, “second”, and “frame” is represented by a BCD code, and is stored in the second disc-shaped recording medium. The recorded time information is the above "hour"
22. The data recording apparatus according to claim 21, wherein each unit of "minute", "second", and "frame" is represented by a binary code. 24. A data recording method for recording main data and time information attached to the main data on a recording medium, comprising: identifying a type of the recording medium; Of the time information represented by the format, the time information in the first format is converted into the time information in a second format different from the first format, and the converted time information is converted together with the main data into the time information. A data recording method for recording on a recording medium. 25. The conversion step according to claim 23, wherein the first time information represented by a first format corresponding to the CD format and a second time information represented by a second format different from the first format. 25. The data recording method according to claim 24, further comprising outputting information and converting one of the first and second time information into the other corresponding to the type of the recording medium. 26. The first time information includes “minutes” and “seconds”.
26. The second time information includes absolute time information indicated by each unit of "hour", "minute", "second", and "frame", wherein the second time information includes absolute time information indicated by each unit of "frame". Data recording method. 27. The first time information, wherein the “minutes”
Each unit of “second” and “frame” is represented by a BCD code, and the second time information includes the “hour”, “minute”, and “second”.
27. The data recording method according to claim 26, wherein each unit of "frame" is represented by a BCD code. 28. The first time information, wherein the “minutes”
Each unit of “second” and “frame” is represented by a BCD code, and the second time information includes the “hour”, “minute”, and “second”.
27. The data recording method according to claim 26, wherein each unit of "frame" is represented by a binary code. 29. The data recording method according to claim 24, wherein the time information is recorded on a Q channel included in subcode information formed based on a CD format. 30. A data recording method for recording main data and time information attached to the main data on a recording medium, comprising: identifying a type of the recording medium; A data recording method for generating time information selected from the time information represented by a format, and recording the generated time information together with the main data on the recording medium. 31. The step of generating, according to the type of the recording medium, first time information represented by a first format corresponding to a CD format, and a second time information different from the first format. 31. The data recording method according to claim 30, wherein one of the second time information represented by the following format is output. 32. The first time information includes “minutes” and “seconds”.
32. The second time information includes absolute time information indicated by each unit of "hour", "minute", "second" and "frame", wherein the second time information includes absolute time information indicated by each unit of "frame". Data recording method. 33. The first time information comprises the “minute”.
Each unit of “second” and “frame” is represented by a BCD code, and the second time information includes the “hour”, “minute”, and “second”.
33. The data recording method according to claim 32, wherein each unit of "frame" is represented by a BCD code. 34. The first time information includes the “minute”.
Each unit of “second” and “frame” is represented by a BCD code, and the second time information includes the “hour”, “minute”, and “second”.
33. The data recording method according to claim 32, wherein each unit of "frame" is represented by a binary code. 35. The data recording method according to claim 30, wherein the time information is recorded on a Q channel included in subcode information formed based on a CD format. 36. A data reproducing apparatus for reproducing a recording medium on which main data and time information accompanying the main data are recorded, comprising: an identification unit for identifying a type of the recording medium; Pickup means for reading the recorded time information; demodulation means for switching the format of the time information output from the pickup means according to the type of the recording medium; and time information output from the demodulation means. A data reproducing apparatus comprising: reproducing means for reproducing or displaying the data. 37. The demodulation means comprising: first address information represented by a first format corresponding to a CD format; and second address information represented by a second format different from the first format. 37. The data reproducing apparatus according to claim 36, further comprising the step of: outputting the first and second address information from one of the first and second address information according to the type of the recording medium. 38. The first address information includes “minutes”.
The second address information includes absolute time information indicated by each unit of “second” and “frame”, and the second address information includes “hour”, “minute”
The data reproducing apparatus according to claim 37, further comprising absolute time information indicated by each unit of "second" and "frame". 39. In the first address information, each unit of “minute”, “second”, and “frame” is represented by a BCD code, and the second address information is “hour”.
39. The data reproducing apparatus according to claim 38, wherein each unit of "minute", "second", and "frame" is represented by a BCD code. 40. In the first address information, each unit of “minute”, “second”, and “frame” is represented by a BCD code, and the second address information is “hour”.
39. The data reproducing apparatus according to claim 38, wherein each unit of "minute", "second", and "frame" is represented by a binary code. 41. The data reproducing apparatus according to claim 36, wherein the time information is address information recorded on a Q channel included in subcode information formed based on a CD format. 42. A first disk-shaped recording medium having a first recording density, wherein said main data and said time information are recorded according to a CD format, and said first recording density. 37. A second disk-shaped recording medium having a higher second recording density and in which the main data and the time information are recorded according to a specific format based on the CD format.
A data reproducing apparatus according to claim 1. 43. The time information recorded on the first disc-shaped recording medium includes absolute time information indicated by each unit of “minute”, “second”, and “frame”, and the second disc-shaped recording medium The time information recorded in
43. The data reproducing apparatus according to claim 42, comprising absolute time information indicated by each unit of "second" and "frame". 44. The time information recorded on the first disk-shaped recording medium includes the “minute”, “second”, and “frame”.
Are represented by a BCD code, and the time information recorded on the second disk-shaped recording medium is represented by a BCD code representing each of the units of “hour”, “minute”, “second”, and “frame”. 44. The data reproducing apparatus according to claim 43. 45. The time information recorded on the first disk-shaped recording medium includes the “minute”, “second”, and “frame”.
Is represented by a BCD code, and the time information recorded on the second disk-shaped recording medium is represented by the "hour"
44. The data reproducing apparatus according to claim 43, wherein each unit of "minute", "second", and "frame" is represented by a binary code. 46. The first disc-shaped recording medium has the time information recorded in a first format conforming to a CD format by modulating a wobbling groove formed in advance, and the second disc-shaped recording medium has a second format. The disk-shaped recording medium is
The time information is recorded in a second format according to a specific format based on the CD format by modulating a wobbling groove formed in advance,
43. The data reproducing apparatus according to claim 42, wherein said identification means identifies said first and second disk-shaped recording media by identifying said first format and said second format.