KR20050013017A - Method and apparatus for marking reproducing velocity information on a disc and the disc thereof - Google Patents

Abstract

PURPOSE: A regeneration speed data recording method, apparatus and disc is provided to prevent a lowering of a repetitive regeneration quality by using prestored regeneration speed data in case that a disc is for a high speed record. CONSTITUTION: The method comprises two steps. User data is recorded at a data area of the disc. Regeneration speed data is recorded on either a lead-in area or a lead-out area of the disc while the user data is being recorded, after recording the user data is finished or before the user data is recorded. The regeneration speed data is recorded at a regeneration-only area or a control data area of the lead-in or the lead-out area. When the disc is loaded in a regeneration apparatus, the regeneration speed data is read and the user data on the disc is regenerated according to the regeneration speed data.

Description

Method and apparatus for marking reproducing velocity information on a disc and the disc

The present invention relates to reproduction speed, and more particularly, to a method for recording reproduction speed information on a disc, a method for reproducing, an apparatus thereof, and a disc thereof.

In general, a disc drive has a speed of writing data to or reproducing data from a disc based on how many times the transfer rate is based on 150 KB / Sec, the standard speed used in early CDs. Display. In other words, 10x speed means 1.5MB / Sec transmission speed, which is 10 times 150KB. 1x speed is indicated as 1X, and 2x speed is indicated as 2X. The rest is the same.

DVDs with larger recording capacities than CDs have become widespread. DVD-RAM supports recording speeds of 2X and 5X, and DVD-RW also supports recording speeds of 1X and 2X. On the other hand, playback is performed at a playback speed of 1X or 2X regardless of the recording speed.

Recently, discs that support faster high-speed recording have been proposed. However, even for discs that support high-speed recording, playback is premised on the reproduction speed of 1X or 2X regardless of the recording speed as in the conventional case.

However, if the maximum recording speed is gradually increased, it is difficult to guarantee the playback quality when playback is performed at a specific playback speed regardless of the recording speed. This is because it is difficult to obtain a desired reproduction quality by reproducing a disc recorded under various recording conditions from low speed recording to high speed recording at one reproduction speed. That is, various conditions affecting the recording, for example, the characteristics of the recording film, the magnitude of the recording power, the shape of the recording waveform, and the like may be set differently in the low speed recording and the high speed recording, but at one reproduction speed. This is because it is difficult to obtain a desired reproduction quality by fixing.

In the case of a disc recorded at a high speed, even when the same reproduction power is used, more heat energy is received when reproducing at a low speed, thereby failing to exhibit satisfactory plural repetitive reproduction characteristics. In order to solve such a problem, it is possible to improve the playback characteristics of the disc or to make the playback speed faster. However, it is not easy to develop a disc having physical properties that satisfy these conditions because the reproduction characteristics must be improved while satisfying the recording characteristics at high speed. On the other hand, it is not difficult to improve the reproduction speed, but from the viewpoint of a user having a disc drive manufactured at a conventional reproduction speed, that is, a low reproduction speed, compatibility problems arise.

Indeed, the Applicant measured jitter one time at 1X playback speed for each of the low and high speed discs, and then measured the jitter, and then played back the same speed 10 ⁷ times and then measured the jitter again. Compared. The disc used was a DVD-RAM, with 1X at low speed. The experiment was performed by selecting 4X at high speed.

6A shows the recording waveform used for the experiment. Referring to FIG. 6A, a recording waveform uses multi-pulse to form a mark of channel modulated data, and a DC pulse to form a space of channel modulated data. Pw stands for write power, Pe stands for erase power, and Pb stands for bias power.

Figure 6b shows the experimental results graphically, Figure 6c graphically.

6A and 6B, the jitter is 7.9% after 1 play or 10 ⁷ times for a disc that supports 1X, but the jitter after a single play is 7.9% for a disc that supports 4X. The jitter measured after ⁷ regenerations is 9.1%. As a result of the experiment, it can be seen that, in the case of a disc supporting high-speed recording, the playback characteristics deteriorate as the number of times of playback increases when the disc is played at a specific playback speed.

Accordingly, a technical object of the present invention is to provide a method of recording information on a disc, a method of reproducing the same, an apparatus thereof, and a disc so that the reproducing quality can be ensured even in the case of a disc supporting high-speed recording.

1 is a block diagram of an apparatus for recording reproduction speed information according to the present invention;

2 is a block diagram of a disk drive in which the apparatus of FIG. 1 is implemented;

3a and 3b is a structural diagram of a disk 100 according to a preferred embodiment of the present invention,

4 is a structural diagram of a disc 100 in which reproduction speed information is recorded according to an embodiment of the present invention;

5 is a structural diagram of the disc 100 of FIG. 3A in which reproduction speed information is recorded according to another embodiment of the present invention;

6A and 6B are structural diagrams of the disc 100 of FIG. 3B in which reproduction speed information is recorded according to another embodiment of the present invention;

7A and 7B are structural examples of reproduction speed information according to the present invention;

8 is a flowchart for explaining a playback method according to a preferred embodiment of the present invention.

The technical problem, according to the present invention, the lead-in area; Data area; And a lead-out area, in which at least one of the lead-in area and the lead-out area records reproduction speed information indicating a reproduction speed of data recorded in the data area. Is achieved.

Preferably, at least one of the lead-in area and the lead-out area is provided with a reproduction only area in which disc information is recorded, and the reproduction speed information is recorded in the reproduction only area.

Also, a first recording layer comprising a lead-in area, a data area and an outer area; And a second recording layer composed of an outer area, a data area and a lead-out area. And at least one of the lead-in area, the lead-out area, and the outer area records reproduction speed information indicating a reproduction speed of data recorded in at least one of the first recording layer and the second recording layer. It is also achieved by the disk.

On the other hand, according to another aspect of the present invention, the technical problem is a method of recording information on a disk, comprising the steps of: recording user data in the data area of the disk; And reproducing data recorded on the disc in at least one of a lead-in area and a lead-out area of the disc at any time before, during, or after performing the step of recording the data. It is also achieved by a method characterized by comprising the step of recording speed information.

A method of playing a disc, the method comprising: reading play speed information from the disc; And reproducing the data recorded on the disc at a reproduction speed according to the read reproduction speed information.

On the other hand, according to another field of the present invention, the technical problem is an apparatus for recording information on a disk, comprising: a recording unit for recording data on the disk; And a control unit for controlling the recording unit so that reproduction speed information is recorded in at least one of a lead-in area and a lead-out area of the disc.

In addition, an apparatus for playing a disc, the apparatus comprising: a reading unit for reading reproduction speed information from the disc; And a control unit for reproducing data recorded on the disc at a reproduction speed according to the reproduction rate information read by the reading unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an apparatus for recording reproduction speed information according to the present invention.

Referring to FIG. 1, the apparatus includes a recording / reading unit 1 and a control unit 2. The recording / reading section 1 records data on the disk 100, which is an information storage medium according to the present embodiment, and reads the recorded data. The control unit 2 controls the recording / reading unit 1 to record the reproduction speed information on the disc 100 or read the reproduction speed information when the reproduction speed information is recorded on the disc 100 according to the present invention. To play the disc 100 accordingly. The reproduction speed information refers to information indicating the speed at which the disc 100 should be played. In general, the reproduction speed information is recorded as invariant information by the disc producer during disc production, or is recorded by the disc drive after data is started, recorded, or completed on the disc 100 at a predetermined recording speed.

2 is a block diagram of a disk drive in which the apparatus of FIG. 1 is implemented.

2, the disc drive includes a pickup 10 as the recording / reading section 1. The disk 100 is mounted to the pickup 10. The disk drive also includes a PC I / F 21, a DSP 22, an RF AMP 23, a SERVO 24, and a SYSTEM CONTROLLER 25 as the control unit 2.

In recording, the PC I / F 21 receives a recording command from the host (not shown) along with data to be recorded. The SYSTEM CONTROLLER 25 performs the initialization required for recording. That is, information necessary for initialization, such as disk information stored in the lead-in area, is read out, and then recording is prepared based on this information. The DSP 22 performs ECC encoding by adding additional data such as parity for error correction of the data to be recorded received through the PC I / F 21, and modulates the ECC encoded data in a predetermined manner. The RF AMP 23 converts the data output from the DSP 22 into an RF signal. The pickup 10 records the RF signal output from the RF AMP 23 on the disk 100. The SERVO 24 receives a command necessary for servo control from the SYSTEM CONTROLLER 25 and servo controls the pickup 10. If the playback speed information is not previously recorded on the disc 100, the SYSTEM CONTROLLER 25 stores the playback speed information according to the present invention at the time of starting recording, during recording, or after recording is completed. Command the pickup 10 to write in a predetermined area.

At the time of reproduction, the PC I / F 21 receives a reproduction command from a host (not shown). The SYSTEM CONTROLLER 25 performs initialization required for playback. At this time, the SYSTEM CONTROLLER 25 reads out the reproduction speed information recorded on the disc 100 according to the present invention, and performs the reproduction at the reproduction speed accordingly. The pickup 10 outputs an optical signal obtained by irradiating a laser beam to the disk 100 and receiving a laser beam reflected from the disk 100. The RF AMP 23 converts the optical signal output from the pickup 10 into an RF signal and provides modulated data obtained from the RF signal to the DSP 22, while providing a servo signal for control obtained from the RF signal. To provide. The DSP 22 demodulates the modulated data and outputs the data obtained through ECC error correction. Meanwhile, the SERVO 24 receives the servo signal received from the RFAMP 23 and the command required for the servo control received from the SYSTEM CONTROLLER 25 to perform servo control on the pickup 10. The PC I / F 21 sends data received from the DSP 22 to the host.

3A and 3B show the structure of a disc 100 according to an embodiment of the invention.

Referring to FIG. 3A, when the disc 100 is a single recording layer disc having one recording layer L0, it has a disc structure composed of a lead-in area, a data area and a lead-out area. The lead-in area is located on the inner circumferential side of the disk 100 and the lead-out area is located on the outer circumferential side of the disk 100. The data area is located between the lead-in area and the lead-out area.

Referring to FIG. 3B, in the case where the disc 100 is a dual recording layer disc having two recording layers L0 and L1, the lead-in area, the data area, and the outer area have an outer circumference at the inner circumference side of the disc 100 in the recording layer L0. And the outer area, the data area and the lead-out area are sequentially arranged from the outer circumference side to the inner circumference side of the disc 100 in the recording layer L1. Unlike the single recording layer disc of FIG. 3A, the lead-out area is also arranged on the inner circumferential side of the disc 100. As shown in FIG. That is, the recording path for recording data is an OTP (Opposite Track Path) from the lead-in area of the recording layer L0 to the area outside of the recording layer L0, and then from the area outside of the recording layer L1 to the lead-out area of the recording layer L1. to be.

4 is a physical structural diagram of the disc 100 of FIG. 3A in which reproduction speed information is recorded according to an embodiment of the present invention.

Referring to Fig. 4, in this embodiment, the reproduction speed information is recorded in the lead-in area when the disc 100 is the single recording layer disc of Fig. 3A. Accordingly, the disc drive reads the reproduction speed information recorded in the lead-in area during reproduction, and reproduces the disc 100 at the reproduction speed accordingly. Alternatively, the reproduction speed information may be recorded in a part of the data area or recorded in the lead-out area. Furthermore, the reproduction speed information may be repeatedly recorded for robustness of the information, or may be recorded a plurality of times over various areas.

5 is a physical structural diagram of the disc 100 of FIG. 3B in which reproduction speed information is recorded according to another embodiment of the present invention.

Referring to Fig. 5, the reproduction speed information is recorded in the lead-in area of the first recording layer L0 when the disc 100 is the dual recording layer disc of Fig. 3B. Accordingly, the disc drive reads the reproduction speed information recorded in the lead-in area during reproduction, and reproduces the disc 100 at the reproduction speed accordingly. Even in the case of a dual recording layer disc, alternatively, the reproduction speed information can be recorded in any one of a data area, an outer area and a lead-out area. Furthermore, it can of course be repeatedly recorded for robustness of the information, or can be recorded multiple times over various areas.

6A is a detailed structural diagram of a lead-in area in which reproduction speed information is recorded, as shown in FIGS. 5A and 5B according to an embodiment of the present invention.

Referring to Fig. 6A, the lead-in area is divided into a reproduction-only area in which predetermined data is pre-recorded and a recordable area in which data can be recorded. Disc information is recorded in the form of a pit or a high frequency wobble at the time of disc mastering in the reproduction-only area. Disc information recorded in the read only area includes fixed constant information that should be known for recording or reproducing data on the disc, such as disc diameter, reflectance, recording layer structure, version information, writing strategy, and the like. In particular, according to this embodiment, the reproduction speed information is recorded as one of the disc information. Data recorded in the reproduction-only area can be reproduced only.

On the other hand, the recordable area is provided with a defect management area DMA (Control Management Area), a control data area, an OPC (Optimum Power Control) test zone and a buffer area. In the defect management area, when a defect occurs in the data recorded on the disc 100, information for processing and managing the defect is recorded. In the control data area, variable information, such as drive and disc information, to be recorded on the disc or to reproduce the data is recorded. Information regarding the recording speed, the reproduction power, and the like can be recorded. The drive information includes, for example, manufacturer information, manufacturer related information, a manufacturing number, a serial number of the drive, and the like, and the disk information includes, for example, an address of an area in which new OPC data is recorded, and final drive information. The address of the area, the address of the area in which the end user data is recorded, and the like are recorded. The OPC test zone is an area reserved for testing the power of the laser beam for optimal power control. The buffer area is provided for the boundary with the data area in which user data is recorded.

Unlike in FIG. 6A, when the disc 100 is a play-only disc, the lead-in area may include only a play-only area.

6B is a detailed structural diagram of a lead-in area in which reproduction speed information is recorded, as shown in FIGS. 5A and 5B according to another embodiment of the present invention.

Referring to Fig. 6B, the lead-in area is divided into a read-only area in which predetermined data is pre-recorded and a recordable area in which data can be recorded. As in Fig. 6A, the disc information is recorded in the form of pits or high frequency wobble at the time of disc mastering in the reproduction-only area. Disc information recorded in the read only area includes fixed constant information that should be known for recording or reproducing data on the disc, such as disc diameter, reflectance, recording layer structure, version information, writing strategy, and the like.

On the other hand, the recordable area is provided with a defect management area DMA (Control Management Area), a control data area, an OPC (Optimum Power Control) test zone and a buffer area. The information recorded in each area is the same as that described with reference to Fig. 6A.

In particular, according to this embodiment, reproduction speed information is recorded in the control data area of the recordable area. The reproduction speed information can be recorded in the reserved area provided in the control data area. Recording using the reserved area is preferable in terms of compatibility since the existing data structure can be used as it is without changing.

Meanwhile, the area in which the disc information including the reproduction speed information according to the present embodiment is recorded or the control data area may be provided in other areas except for the data area in which user data is recorded. It may be provided in at least one of the lead-in area, the lead-out area and the outer area. Meanwhile, the lead-out area and the outer area may have substantially the same structure as the lead-in area of FIG. 6A or 6B.

7A and 7B are exemplary configurations of the reproduction speed information according to the present invention.

Referring to FIG. 7A, the reproduction speed information informs the reproduction speed. For example, each bit constituting the reproduction speed information may be associated with a double speed to inform the reproduction speed that can be reproduced. The playback speed information is displayed as 1 byte of b7b6b5b4b3b2b1b0 (binary data), b7 corresponds to 8x speed, b6 corresponds to 6x speed, b0 corresponds to 1x speed, 0 is readable, 1 indicates unreadable, 00000000 b indicates Readable with 1X speed, and 00000001 b indicates that it can reproduce at 2X or higher playback speed. b means binary number.

Referring to Fig. 7b, the reproduction speed information informs the minimum and maximum values of the playable double speed. For example, it is possible to express the minimum double speed information in hexadecimal with 1 byte and the simple double speed information in hexadecimal with other 1 byte. Of course, it may be recorded in the order of maximum speed information / minimum speed information.

For example, when reproducing from 1x to 16x, the n th byte and the n + 1 th byte may be expressed as follows. h means hexadecimal number.

Byte n: 01 h

0 0 0 0 0 0 0 One

Byte n + 1: 16 h

0 0 0 One 0 One One 0

It is also possible to express double speed information by using binary numbers instead of hexidecimal. That is, for example, the above double speed case is expressed as follows.

Byte n: 1X

0 0 0 0 0 0 0 One

Byte n + 1: 2 ⁴ = 16X

0 0 0 One 0 One One 0

As another example, a specific combination of bits may be designated in advance at a specific double speed, and the double speed information may be specified and recorded for each bit of the byte in advance.

As another example, without mentioning the double speed, each version number may be promised in advance to contain the playback speed information. That is, the playback speed information is displayed as version number.

A method of recording the reproduction speed information according to the preferred embodiment of the present invention based on the above configuration will be described.

8 is a flowchart for explaining a playback method according to a preferred embodiment of the present invention.

Referring to FIG. 8, when the disc 100 is loaded (step 801), the disc drive reads the reproduction speed information recorded on the disc 100 (step 802). The disc drive plays the disc 100 at a play speed according to the read play speed information (step 803).

As described above, according to the present invention, by recording the reproduction speed information on the disc, it is possible to ensure an appropriate reproduction quality even for a disc capable of recording at high speed.

Claims (17)

Lead-in area; Data area; And Having a lead-out area, And at least one of the lead-in area and the lead-out area is recorded with reproduction speed information indicating a reproduction speed for data recorded in the data area. The method of claim 1, At least one of the lead-in area and the lead-out area is provided with a read only area in which disc information is recorded. And the reproduction speed information is recorded in the reproduction only area. The method of claim 1, At least one of the lead-in area and the lead-out area is provided with a control data area in which control information for controlling the disc is recorded, And the reproduction speed information is recorded in the control data area. The method of claim 3, And the reproduction speed information is recorded in a reserved area provided in the control data area. A first recording layer consisting of a lead-in area, a data area and an outer area; And And a second recording layer consisting of an outer area, a data area and a lead-out area. And at least one of the lead-in area, the lead-out area, and the outer area records reproduction speed information indicating a reproduction speed of data recorded in at least one of the first recording layer and the second recording layer. disk. The method of claim 5, And the reproduction speed information is recorded in a control data area provided in at least one of the lead-in area, the lead-out area and the outer area. The method of claim 1, And the reproduction speed information includes minimum reproduction speed information and maximum reproduction speed information. The method of claim 1, And the play speed information includes playable speed information. In a method of recording information on a disc, Recording user data in a data area of the disc; And At any point before, during, or after performing the step of recording the data, a reproduction speed for the data recorded on the disc in at least one of the lead-in area and the lead-out area of the disc. Recording the information. The method of claim 9, Recording the reproduction speed information And recording as disc information in a reproduction-only area provided in at least one of the lead-in area and the lead-out area. The method of claim 9, Recording the reproduction speed information And recording in a reserved area of a control data area provided in at least one of the lead-in area and the lead-out area. In the method of playing a disc, Reading reproduction speed information from the disc; And And reproducing data recorded on the disc at a reproduction speed according to the read reproduction speed information. The method of claim 12, The step of reading the reproduction speed information And reading from at least one of a lead-in area and a lead-out area of the disc. An apparatus for recording information on a disc, A recording unit for recording data on the disc; And And a control unit for controlling the recording unit so that reproduction speed information is recorded in at least one of a lead-in area and a lead-out area of the disc. The method of claim 14, The control unit And the recording / reading unit is controlled to record the reproduction speed information in a control data area provided in at least one of the lead-in area and the lead-out area. In a device for playing a disc, A reading unit for reading reproduction speed information from the disc; And And a control unit for reproducing the data recorded on the disc at the reproduction speed according to the reproduction rate information read by the reader. The method of claim 16, The control unit And the reading unit controls to read the reproduction speed information from at least one of a lead-in area and a lead-out area of the disc.