JPH0955016A - Disk-like recording medium, method and device for data reproduction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk-like recording medium and the method and the device for data reproduction capable of preventing unauthorized copying by arranging concentric circular track regions and spiral track regions side by side on a disk-like recording medium. SOLUTION: Plural spiral track regions Tsp in which spiral shaped tracks are formed and plural concentric circular track regions Tccc in which concentric circular tracks are formed are provided on a disk-like recording medium D. By mixing the regions Tcc and Tsp , the medium D, in which the data on both tracks are not reproduced by a conventional reproducing device, is obtained. In order to reproduce the data on the medium D, discrimination is made to determine whether a present reproducing position is in the Tcc or in the Tsp and a use is made for the method and the device for data reproduction having a function to switch a reproducing condition. Thus, the disk-like recording medium and the method and the device, in which an unauthorized copy is prevented, are realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped recording medium and a data reproducing method and device for reproducing data from the disc-shaped recording medium, and particularly to preventing illegal copying of data recorded on the disc-shaped recording medium. It is for doing.

[0002]

2. Description of the Related Art In recent years, as a data recording medium on which information signals such as voice, video, and other various data are recorded, a medium on which these information signals are optically recorded, specifically, so-called for music. Compact disc (CD)
Or a CD that uses a disc of the CD standard for data
ROMs and the like are popular all over the world. In addition, a so-called hard disk is often used as a data recording medium of a data recording device provided in a computer or the like, which enables high-speed writing / reading and realizes a large capacity.

Here, the CD standard disc has spiral tracks formed thereon, is suitable for data to be read sequentially, and employs a convolutional code without interruption. The hard disk has concentric tracks,
Since the track is physically completed, the data has a block-completed structure.

Further, in addition to the above-mentioned CD, CD-ROM, or hard disk, a disk-shaped recording medium is
There are so-called magneto-optical (MO) disks and the like. This magneto-optical disk adopts a block complete structure with a spiral type track, and takes advantage of each of the two types of track structures adopted in the above-mentioned CD, CD-ROM and hard disk.

[0005]

By the way, it is recorded on a read-only disk-shaped recording medium such as the above-mentioned CD or CD-ROM, or a recordable disk-shaped recording medium such as a hard disk or a magneto-optical disk. BACKGROUND ART Information is read by a reproducing device, and the read data is illegally copied to another disc-shaped recording medium.

At the time of this illegal copying, a method of directly recording the RF reproduction signal read from the disk-shaped recording medium or its binary signal on another writable disk-shaped recording medium, and the above-mentioned RF reproduction signal. Alternatively, there is a method in which the binarized signal is decoded by another decoding system, then encoded again, and the data obtained by this encoding is cut on a master disc for disc manufacturing. According to the method of copying data to the master disc, a large number of duplicate discs can be manufactured from the master disc, so that the damage caused by illegal copying becomes large.

However, it is difficult to effectively prevent such illegal copying, and many resort to legal means.

In view of the above situation, the present invention provides a disc-shaped recording medium that cannot be easily illegally copied, and a method and apparatus for reproducing data from the disc-shaped recording medium.

[0009]

The disk-shaped recording medium of the present invention has a concentric circular track area in which concentric tracks are formed and a spiral track area in which spiral tracks are formed. The above problems are solved.

That is, according to the disk-shaped recording medium of the present invention, different track formats of the concentric circular track area and the spiral track area are made to coexist in the disk so that both tracks cannot be reproduced by an ordinary reproducing apparatus. I have to.

Therefore, in order to reproduce the disc-shaped recording medium of the present invention, it is determined whether the current reproduction position is the concentric track area or the spiral track area, and the reproducing head is set to the concentric circle according to the result of the judgment. Switching control is performed between the read state of the recorded data in the track area and the read state of the recorded data in the spiral track area.
Use a data reproducing method and device.

[0012]

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a disk-shaped recording medium of the first configuration example of the present invention.

The disc-shaped recording medium D shown in FIG.
By providing a plurality of concentric circular track regions T _{CC in} which concentric circular tracks are formed at arbitrary locations in the spiral type track region in which spiral tracks are formed, the spiral type track regions are formed into a plurality of spiral type tracks. The disk is divided into areas T _SP , and the concentric track areas T _CC and the spiral track areas T _SP are mixed on the recording surface of the disk. The disc-shaped recording medium D may be read-only, may be recorded only once, or may be recorded a plurality of times (overwritable). Further, it is possible to set one of the concentric track areas T _CC and each of the spiral track areas T _SP as a recordable area and the other as a read-only area.

Here, in the plurality of spiral track areas T _SP , for example, continuous data of the same format can be recorded, data of independent formats or data of different contents can be recorded. However, if the spiral track areas T _SP have the same format, which of the track areas T _{SP is used?}
It is possible to use the same decoding method even for data read from.

[0016] When the recording of each spiral track area T _SP to each independent format data and each different content data is performed, data of any format and content to the respective track area T _SP is recorded Information indicating whether or not it is stored in, for example, the adjacent concentric track regions T _CC . With reference to FIG. 1 as an example, for example, the above information corresponding to the spiral track area T _{SP (A)} corresponds to the concentric track area T _{CC (a)} and the above information corresponding to the spiral track area T _{SP (B).} Information is recorded in the concentric track area T _{CC (b)} . Of course, information about the format and data content of each spiral track area T _SP is stored in the adjacent concentric track areas T _SP.
It is also possible to store in another concentric track area T _CC instead of _CC . In the above description, the case where the information about the format and the data content of the spiral track area T _SP is stored in the concentric track area T _CC is taken as an example, but the opposite, that is, the spiral track area T _SP. It is also possible to store information on the format and data content of the concentric circle side track area T _CC .

The formats of the concentric track areas T _CC may be the same or different. However, if the format of each track area T _CC as the same respectively, be data read from any track areas T _CC becomes possible to use the same decoding method.

Further, as the format of each of the track areas T _SP and T _CC , each spiral track area T
_{The SP} format is the same format, and the concentric track area T _CC is the same as or different from the spiral track area T _SP .
The spiral track areas T _SP have different formats, and the concentric track areas T _CC
It is also possible to consider various combinations such as the formats of the respective spiral type track areas T _SP corresponding to (for example, adjacent to) each format or different from each other.

The physical position (address) of each spiral track area T _SP or each concentric track area T _{CC on} the disk-shaped recording medium D, and which is the track area T _SP or the track area T _CC ? The identification information indicating the so-called TOC (Table Of Contents
nts) area and can be recorded by using so-called wobbling of tracks. Further, the identification information can be arranged as a predetermined flag, for example, at the beginning of a sector recorded in each spiral track area T _SP or each concentric track area T _CC , and in this case, the TOC area. It is not necessary to store the identification information in advance. Further, as the identification information, the position (address) at which the track area is switched can be recorded by using the TOC area or wobbling, or can be recorded at any position in the sector instead of the TOC area or the like.
In this case, the track area is switched based on the address.

Next, in the disk-shaped recording medium of the first configuration example, an example in which a plurality of spiral track areas T _SP and concentric track areas T _CC are formed respectively on the disk recording surface is given. As the disk-shaped recording medium of the second configuration example of the present invention, the one shown in FIG. 2 can be cited.

The disc-shaped recording medium D shown in FIG.
Spiral track area E for read-only
It is a hybrid disc in which there are two, an _RS and a writable concentric track area E _WC .

When the disk-shaped recording medium D of FIG. 2 is used, the reading device reads the spiral track area E _RS during normal reproduction and writes the spiral track area E _WC to the concentric track area E _WC at the _appropriate time according to a command from the system. To do. The formats of the spiral track area E _RS and the concentric track area E _WC can be the same or different as in the first configuration example.

A specific system to which the disc-shaped recording medium D of FIG. 2 is applied is a game system. In this case, the disc-shaped recording medium D is a software disc, and the above spiral is used. Program data is recorded in the type track area E _RS, and maximum score information (so-called high score) in the game and intermediate results of the game are recorded in the concentric type track area E _WC . It can also be applied to a so-called karaoke system. In this case, the music data of the performance is recorded in the spiral track area E _RS , and the voice data actually sung is recorded in the concentric track area E _WC. It becomes possible.

Here, in the disk-shaped recording medium D of the above-mentioned first and second configuration examples, for example, the spiral track area is suitable for sequentially writing or reading data, and also the sequential breaks. Since convolutional codes are suitable for data that does not exist, these sequential convolutional codes are applied to the spiral track area. On the other hand, in the concentric track area, since the track is physically completed, the data has a fragmentary, that is, block completed configuration. Of course, applying a sequential convolutional code to the concentric track area and applying the block complete configuration to the spiral track area, or both the concentric track area and the spiral track area,
It is also possible to arrange either a sequential convolutional code or a block complete structure.

Further, it is preferable that the concentric track area has a data arrangement based on a constant angular velocity (CAV) reproduction, and the spiral track area preferably has a data arrangement based on a constant linear velocity (CLV) reproduction. . As a matter of course, the concentric circular track area may have a data arrangement for constant linear velocity reproduction and the spiral track area may have a data arrangement for constant angular velocity reproduction, or both the concentric circular track area and the spiral type track area may have a constant linear velocity or It is also possible to align them with any of the constant angular velocities.

Here, if the disc-shaped recording medium D of the above-mentioned first and second configuration examples of the present invention is used, the information recorded on the disc-shaped recording medium is read by the reproducing apparatus as described above, It is possible to prevent the read data from being illegally copied to another disc-shaped recording medium. The reason why illegal copying can be prevented by using the disc-shaped recording medium of the present invention will be described below.

FIG. 3 shows a simplified copy mode at the disk read signal level in the illegal copy method. The disk-shaped recording medium D ₁ in the figure is a disk to be copied, and the disk-shaped recording medium D ₂ is a disk that is newly manufactured, that is, a disk that has been copied.
Further, in the figure, the device indicated by the reference numeral 3 is a reading device for the disc-shaped recording medium D ₁ , and the device indicated by the reference symbol 4 is a writing device for the disc-shaped recording medium D ₂ .

Here, for example, the disk-shaped recording medium D ₁
If the disk recording surface of the disk is composed of one spiral type track, these disk-shaped recording media D ₁
And the disc-shaped recording medium D ₂ are rotated at the same rotation cycle, and the signal read while tracing the disc-shaped recording medium D _{1 from} the start to the end of reading is recorded as it is on the disc-shaped recording medium D _2. The disk-shaped recording medium D ₂ is the same as the disk-shaped recording medium D ₁ .

On the other hand, the disk-shaped recording medium D
Assuming that ₁ is a disk in which the spiral track area and the concentric track area of the present invention described above are mixed, in the duplication method as described above, for example, the spiral track area and the concentric track area have the same format. Even if there is, the control of the reading device 3 of the disc-shaped recording medium D ₁ and the writing device 4 of the disc-shaped recording medium D ₂ that behaves in a similar manner are required, and duplication itself becomes extremely difficult. Of course, if the spiral track area and the concentric track area have different formats, duplication becomes more difficult. From this, it is possible to prevent illegal copying by using the disk-shaped recording medium D of the first and second configuration examples of the present invention described above.

Next, the data reproducing method of the present invention for reproducing the disc-shaped recording medium D of the present invention will be described.

In the flow chart of FIG. 4, the identification information indicating either the spiral track area or the concentric track area and the address information of the spiral track area and the concentric track area are, for example, the TOC of the disk-shaped recording medium. The flow of processing when the identification information and the address information recorded in the area are read out from this TOC area and the data is reproduced based on these information is shown.

In FIG. 4, in step S1, the identification information and the address information are read from the TOC area of the disk-shaped recording medium to determine whether the track area corresponding to each address is spiral type or concentric type. In the next step S2, the reproduction is started, and the data read control is changed as in steps S3 and S4 depending on whether the track to be reproduced is the spiral track area or the concentric track area. That is, when it is determined in step S2 that the area is a spiral track area, step S3
In step S2, the read control corresponding to the spiral track area is performed. If it is determined in step S2 that the track area is the concentric track area, the read control corresponding to the concentric track area is performed in step S4.
As a specific example, for example, when the sequential convolutional code and the data arrangement with a constant linear velocity are applied to the spiral track area, the read control corresponding to these is performed in step S3, and the concentric track When the block completion configuration and the data arrangement with constant angular velocity are applied to the area, the read control corresponding to these is performed in step S4. Note that when sequential data is recorded in the concentric track area, in order to read the data sequentially, if the last concentric track is played, the next concentric track must be played continuously. , It is also necessary to control track jumps during playback.

The data read out in steps S3 and S4 is subjected to a decoding process corresponding to the encoding applied to the data in step S5.

In the flow chart of FIG. 4, the TOC is
Although an example in which identification information etc. is recorded in the area is given,
When the identification information is arranged as a predetermined flag at the beginning of a sector instead of the TOC area, the flag is detected in step S1 of the flowchart of FIG. 4, and based on the detected flag in the next step S2. And determines whether it is a spiral track area or a concentric track area. Steps S3 to S below
Up to 5, the same as above.

Further, instead of switching the read processing according to the identification information as shown in FIG. 4, the position (for example, sector address) at which the track area is switched is recorded as identification information at any position in the sector, for example. Aside
The processing when switching the track area based on the address is as shown in the flowchart of FIG. 5 below.

In FIG. 5, in step S10,
A track on the disk-shaped recording medium D is reproduced, and in the next step S11, it is judged whether the information reproduced from the track is normal data or identification information, and if it is normal data, step S12. Then, the normal data is decoded. On the other hand, when it is determined that the identification information is the identification information in step S11, the identification information is stored in the memory in step S13.

In the next step S14, the position at which the track area indicated by the identification information is switched (for example, the sector address) is compared with the sector address of the currently reproduced track, and the sector address of the currently reproduced track is compared. Is not the same as the address as the identification information, that is, when it is not the final point of the track area, the process returns to step S10 to repeat the above process. On the other hand, when the sector address of the track currently being reproduced coincides with the address as the identification information in step S14, that is, when the end point of the track area is reached, the process proceeds to step S15. S
At 15, the reproduction system is switched.

Next, FIG. 6 shows the structure of a data reproducing apparatus for realizing the above-described data reproducing method.

In FIG. 6, an optical pickup 12 as a reproducing head focuses a laser beam on an optical disk 10 as the disk-shaped recording medium which is rotationally driven by a spindle motor 11, and reflects the reflected laser beam. By receiving the light, the data signal recorded on the optical disk 10 is read out, and this data signal is sent to the reproduction signal processing circuit 13. The optical pickup 12 also outputs a focus servo error signal and a tracking error signal based on the reflected light of the laser light to the reproduction signal processing circuit 1.
3 to the control unit 14.

The control section 14 generates a focus servo signal and a tracking servo signal corresponding to the focus servo error signal and the tracking error signal and sends them to the head drive servo circuit 16, which in turn drives the focus servo signal. Focusing and tracking servo are performed by driving the optical pickup 12 based on the tracking servo signal.

The data signal sent to the reproduction signal processing circuit 13 is demodulated and error-corrected by the reproduction signal processing circuit 13, and normal reproduction data is output via the output terminal 17. To be done.

Of the data demodulated and error-corrected by the reproduction signal processing circuit 13, the data from the TOC area and the identification information are sent to the control unit 14. The control unit 14 stores the information in the memory 15. The control unit 14 controls the head drive servo circuit 16 based on the information stored in the memory 15. That is,
As described above, the spiral track area is controlled to perform the corresponding read operation, and the concentric track area is controlled to perform the corresponding read operation. Explaining with the above-mentioned specific example, for example, when the sequential data and the data arrangement with a constant linear velocity are applied to the spiral track area, a control such that reading corresponding to these is performed, Further, when the block complete configuration and the data arrangement with a constant angular velocity are applied to the concentric track area, control is performed so that reading corresponding to these is performed. Further, for example, when sequential data is recorded in the concentric track area, in order to read the data sequentially, if the last end of a certain concentric track is reproduced, the next concentric track is reproduced continuously. Controls track jumps.

Next, as an example of the format and data contents of the spiral track area and the concentric track area on the disk-shaped recording medium, as shown in FIG. 1, the spiral track area T _SP is independent of each other. Data of different formats and data of different contents are recorded, and the spiral track areas T _CC are arranged in the concentric track areas T _CC adjacent to the spiral track areas T _SP.
The configuration and operation of the data reproducing device when the information indicating what format and content data is recorded in the _SP is described with reference to FIG. In addition,
In the configuration of FIG. 7, only the corresponding components of the signal processing circuit 13 and the control unit 14 of FIG. 6 are extracted and shown.

In FIG. 7, the optical pickup 1
The read signal from the synchronous signal 2 is sent via the terminal 20 to the synchronous circuit 2
Sent to 1. The synchronization circuit 21 performs PLL generation and sync extraction. The synchronization circuit 21 can perform PLL generation and sync extraction regardless of which data is read from either the concentric track area or the spiral track area.
The output data from the synchronizing circuit 21 includes a decoder 22 for decoding the data read from the tracks of the concentric track area and a decoder 2 for decoding the data read from the tracks of the spiral track area.
3 sent to.

Here, when the read signal is data read from the track of the concentric circular track area, the decoder 22 records data of any format and content from the data to each spiral track area. Information indicating whether or not
Based on this information, reproduction parameters for reproducing the spiral track area are generated. When normal data is also stored in the concentric track area, the decoder 22 decodes the normal data and outputs it from the terminal 24.

Next, when the read signal becomes the data read from the track of the spiral track area, the decoder 23 uses the data read from the track of the spiral track area as the reproduction parameter. Decode based on The data decoded by the decoder 23 is output from the terminal 25.

Whether the read signal is from the concentric circular track area or the spiral track area can be detected from the reproduction result of the decoder 22. That is, the decoder 22
Since only the data from the concentric track area can be decoded, if the decoding result is obtained, the read signal is data from the concentric track area. In this case, the decoder based on the detection result. 23 does not work. On the other hand, when no decoding result is obtained from the decoder 22, the read signal is data from the spiral track area, and therefore, at this time, the decoder 23 decodes the data from the spiral track area as described above. It Alternatively, whether the read signal is data from the concentric circular track area or data from the spiral track area can be known in advance from the TOC area or auxiliary information by wobbling as described above.

As described above, according to the configuration example of the present invention, illegal copying can be prevented by mixing the spiral track area and the concentric track area in the disk-shaped recording medium. In addition, it has the following effects.

That is, a disc having spiral type tracks such as a so-called CD is suitable for data to be read sequentially, and the data also employs a convolutional code without a break, but is necessary for partial reading. Since it reads more than the data, it has the drawback of being less efficient. A disk having concentric tracks, such as a hard disk, has a physically completed track, so that the data has a block-completed structure. In this case, random partial reading can be efficiently performed. However, when reading sequentially, the track jump has to be repeated, which reduces efficiency. Furthermore, in magneto-optical discs, etc., the block complete structure is adopted in the spiral type track, and the above two types of merits are taken in. However, when verifying at the time of recording, it is necessary to access again. Will be advantageous. On the other hand, in the present invention, by mixing two types of track areas as described above, these problems are solved and various formats and reproducing methods are possible.

[0050]

In the present invention, since different track formats of the concentric circular track area and the spiral track area are coexisting in the disk-shaped recording medium, both tracks can be reproduced by a normal reproducing apparatus. Therefore, illegal copying can be prevented. Further, by mixing the spiral track area and the concentric track area, various formats and reproducing methods are possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a disc-shaped recording medium of a first configuration example of the present invention.

FIG. 2 is a diagram showing a disc-shaped recording medium of a second configuration example of the present invention.

FIG. 3 is a diagram for explaining an aspect of copying between discs.

FIG. 4 is a flowchart showing an operation of an example of the data reproducing method of the present invention.

FIG. 5 is a flowchart showing another operation of the data reproducing method of the present invention.

FIG. 6 is a block circuit diagram showing a configuration example of a data reproducing device of the present invention.

FIG. 7 is a block circuit diagram showing a configuration example of a main part of a data reproducing device of the present invention.

[Explanation of symbols]

T _SP Spiral track area T _CC Concentric track area D Disk-shaped recording medium

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Owa 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Yoshitomo Osawa 6-7 Kita-Shinagawa, Shinagawa-ku, Tokyo No. 35 Sony Corporation (72) Inventor Akira Kurihara 6-735 Kitashinagawa, Shinagawa-ku, Tokyo No. 35 Sony Corporation (72) Inventor Yoichiro Sako 6-7 35 Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation (72) Inventor Isao Kawashima 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (9)

[Claims] 1. A disk-shaped recording medium, comprising: a concentric track area having concentric tracks formed therein; and a spiral track area having spiral tracks formed therein. 2. The disc-shaped recording medium according to claim 1, wherein identification information of the concentric circular track area and the spiral track area is recorded. 3. The disk-shaped recording medium according to claim 1, wherein a plurality of said concentric circular track areas and a plurality of said spiral track areas are provided. 4. The disk-shaped recording medium according to claim 1, wherein the concentric track area and the spiral track area have different reproduction systems from each other. 5. The concentric track area is recorded in conformity with a constant angular velocity reproducing method, and the spiral track area is recorded in conformity with a constant linear velocity reproducing method. Disk-shaped recording medium. 6. A data reproducing method for reproducing data recorded on a disk-shaped recording medium, wherein the current reproducing position is a concentric track area where concentric tracks are formed, or a spiral track is formed. Discriminating step for discriminating whether or not it is a track type track region, and switching control for controlling the reproducing head to switch between a read state of recorded data in the concentric circular track region and a read state of recorded data in the spiral type track region according to the discrimination result A method for reproducing data, comprising: 7. The switching control step performs switching control according to identification information of the concentric circular track area and the spiral track area obtained by reading from the disk-shaped recording medium. Item 6. The data reproducing method according to Item 6. 8. A reproducing head capable of reading recorded data in a concentric track area having concentric tracks and recorded data in a spiral track area having spiral tracks, and a reproducing head. A data reproducing apparatus, comprising: a control unit that controls switching between a read state of recorded data in the concentric track area and a read state of recorded data in the spiral track area. 9. The control device according to claim 8, wherein the control means performs switching control according to identification information of the concentric track area and the spiral track area obtained by reading from a recording medium. Data playback device.