JP2002324355A - Information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium that can accurately execute continuous regeneration of old data and new data with effectively practical using a record area when adding to record the new data to the record area. SOLUTION: The information recording medium records linking position information indicating the position, where this one bit of information is divided into a plurality of divisions to be recorded at a specified position in an error correcting block, when recording the one bit of information for each of the error correcting blocks. The error correcting block is constructed of a prescribed number of sectors, and each of the sectors is constructed of a prescribed number of synchronous-frames. The linking position information is recorded in a data area around the head position of a specified synchronous-frame in the specified sector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a D
An information recording medium, such as a VD-RW (DVD-RW rewritable), which can record new recording information continuously with old recording information previously recorded on an information recording medium such as a high-density optical disk. Belong.

[0002]

2. Description of the Related Art Generally, in an information recording medium such as a DVD-RW capable of recording more than 1000 times with compatibility with a DVD-ROM, new recording information is overwritten later on an area where old recording information is recorded. In this case, since there is no linking area for the connection, a shift occurs in the frequency and phase relationship at the linking positions of the old recording information and the new recording information, and reading cannot be performed due to discontinuity.

Therefore, in an information recording method and apparatus for additionally recording new recording information on a recording type information recording medium of this type, when recording new recording information continuously with old recording information, conventionally, the old recording information is used. In a link between the information and the new record information, an error correcting process (ECC) in an error correction process used in the old record information or the new record information is performed.
ode) A continuous area corresponding to an information amount corresponding to an error correction unit such as a block is provided, and the last part of the old record information and the first part of the new record information corresponding to this continuous area have, for example, a meaning. No dummy information or specified RF (Radio Freq
uency) signal, and then the recording of the original new recording information is started. Here 1
The ECC block is composed of 16 sectors.

The reason for providing this continuous portion is that, when the new record information and the old record information recorded later are continuously reproduced, if the continuous portion is not provided, the recording area of the old record information and the new record This is because each RF signal may be discontinuous at the boundary with the information recording area, in which case the focus servo and tracking servo during reproduction become unstable.

[0005] The reason for providing a continuous portion for one ECC block and recording meaningless dummy information or the like therein is as follows.
In the conventional error correction processing, error correction is performed for each error correction unit. If new record information is recorded in the middle of the error correction unit, the old record information and the new record information are recorded after the new record information is recorded. When playing back information continuously,
This is because the error correction is not correctly performed on the leading portion of the new recording information in the error correction unit, and therefore, accurate continuous reproduction cannot be performed. At this point, if it is determined in advance that meaningless dummy information or a predetermined RF signal is recorded for one ECC block in the continuous area as described above, even if the old record information and the new record information are recorded in the continuous section, Even if both parts are destroyed by overlapping, the information recorded in that part is meaningless dummy information or a predetermined RF signal. Therefore, this part is skipped without being reproduced and the next part of the connected part is read. By reproducing the new record information from the ECC block, the old record information and the new record information can be reproduced.

Another reason for providing the continuous area is as follows.
If new recording information is recorded continuously to the old recording information without providing a continuous area, both the old recording information and the new recording information may be destroyed at the overlapping part. This is because if the number of error correction units is exceeded, it may not be possible to repair the destroyed recording information. As a solution to this problem, one disclosed in Japanese Patent Application Laid-Open No. 9-270171 has been proposed. This scheme has a capacity of, for example, about 32 kbytes of a conventional error correction unit, and since this area is filled with information irrelevant to reproduction, the above-described high-density information that needs to record a large amount of information is used. For discs, etc., which is extremely inefficient and the recording area on the information recording medium cannot be used effectively, new recording information is added while effectively utilizing the recording area of the information recording medium. An object of the present invention is to provide an information recording method and apparatus capable of recording information and capable of accurately performing continuous reproduction of old recorded information and new recorded information.

[0007]

However, in the above-mentioned conventional linking method, of the data divided and recorded in the error correction unit, the linking portion is located near the rear end of the specific data portion. Stipulated. For this reason, at the time of reproduction, discontinuity of reproduced data occurs in a linking portion, resulting in a frequency or phase shift in reproduced data. Therefore, in order to eliminate this deviation, the reproducing apparatus starts the PLL operation, but it takes a certain time to return to the original state without this deviation. Therefore, in the conventional linking method,
Since the reproduced data cannot be reproduced during a period from the occurrence of a frequency or phase shift in the reproduced data due to the occurrence of linking until the deviation is eliminated, the amount of such non-reproducible data is large. Specifically, for example, 32kBy
In the configuration of an error correction unit composed of columns and rows having a data capacity of about te (bytes) (data configuration in each sector configuring one ECC block shown in FIG. 4B),
The above-mentioned linking position is near the rear end of the data area of the second sync frame H1 (within the PI), and before and after this position, the new data is linked after the old data, so that discontinuity occurs in the new and old data. ing. Further, error correction of data using the above-described PI is performed in units of data for two sync frames. As a result, at the time of reproduction, a shift of the frequency and phase of the new data from the frequency and phase of the old data occurs at the joint of the new and old data. The reproducing apparatus starts the PLL operation so as to eliminate this deviation, but it takes a certain time until the frequencies and phases of the new and old data are aligned (for example, the time for reproducing data for two sync frames). ). For this reason, even when the next horizontal row (third sync frame H2, fourth sync frame H3) following the second sync frame H1 is reproduced, the reproduced data still has a frequency or phase shift. . At the time of reproduction after the fifth sync frame H3, such frequency and phase shifts are eliminated. Therefore, there is a problem that data of a total of 2 rows (first sync frame H0 to fourth sync frame H3), that is, data of a total of 4 sync frames cannot be reproduced.

Accordingly, the present invention has been made in view of the above-mentioned problems. (1) The configuration of the error correction unit is similar to the data configuration in each sector constituting one ECC block shown in FIG. In addition, the point where the data for two sync frames is one horizontal row and there are many rows, (2)
As a result of the discontinuity of the data generated in the linking portion, the data in which the frequency and phase shifts continue is based on the point that the period is substantially equal to two sync frames. If the linking portion is located near the leading end of the data for the first sync frame (that is, the data area near the leading end of the first sync frame in the unit of two sync frames), the reproduction period for the two sync frames elapses. Therefore, it is possible to obtain reproduced data without a shift in frequency or phase, and as a result, the amount of unreproducible data can be halved as compared with the above-described conventional art. Information recording that allows new recording information to be additionally recorded while effectively utilizing the recording area, and enables accurate continuous reproduction of old recording information and new recording information. An object of the present invention is to provide a body.
Further, at the linking position, a recording-to-recording switching portion can be connected.
Even though the probability of occurrence of an uncorrectable error in error correction is low, a data error may still occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an information recording medium capable of preventing occurrence of a data error during reproduction and enabling stable reproduction.

[0010]

In order to solve the above-mentioned problems, the present invention provides the following information recording medium.
When recording information in units of error correction blocks, an information recording medium provided with a linking position which is a recording end position or a leading position of additional recording at a specific position in the error correction block, wherein the error correction block Is composed of a predetermined number of sectors, and each of the sectors is composed of a sync frame including a predetermined number of syncs, and spans a row of correction blocks composed of data and parity in the plurality of sync frames, and spans the plurality of sync frames. The linking position is provided in the vicinity of the first position of the data area of the first sync frame in the specific horizontal correction block of the plurality of sync frames. A recording medium characterized in that:

[0011]

Next, an information recording medium, a recording method and a recording apparatus according to the present invention will be described. The present invention is a recording medium in which a linking position indicating the beginning of additional recording is provided at a specific position in the error correction block when one piece of information is recorded for each error correction block unit. Is composed of a predetermined number of sectors, each of the sectors is composed of a predetermined number of sync frames, and the linking position is provided in a data area near the head position of the specific sync frame in the specific sector. The recording medium is characterized in that:

Further, the present invention is a recording medium wherein a linking position indicating the head of additional recording is provided at a specific position in the error correction block when one piece of information is recorded for each error correction block unit, Each of the error correction blocks is 16
Sectors, each sector is composed of 26 sync frames, and the linking position is
A recording medium provided in a data area immediately after a sync code of a third sync frame in one sector.

Further, the present invention provides a recording medium wherein a linking position indicating the head of additional recording is provided at a specific position in the error correction block when one piece of information is recorded for each error correction block unit. Each of the error correction blocks is 16
, Each of the sectors is composed of 26 sync frames, and the linking position is in the data area immediately after the sync code of the third sync frame in the first sector, and A recording medium provided between a first byte and 10 bytes.

Further, the recording method is a recording method in which, when one piece of information is additionally recorded for each error correction block unit, a linking position indicating the head of the additional recording is provided at a specific position in the error correction block on the recording medium. A first step of detecting a specific sector in an error correction block of one information to be additionally recorded on the recording medium; and a specific sync frame from a plurality of sync frames constituting the specific sector. And a third step of additionally recording new information with the first byte of the data area in the specific sync frame detected in the second step as a linking position. A recording method characterized by comprising:

Further, the recording device is a recording device for setting a linking position indicating the head of additional recording at a specific position in the error correction block on the recording medium when recording one piece of information for each error correction block unit. A first detecting means for detecting a specific sector in an error correction block of one information to be additionally recorded on the recording medium, and a specific sync frame from a plurality of sync frames constituting the specific sector. And a recording means for additionally recording new one information with the first byte of the data area in the specific sync frame detected by the second detection means as a linking position. A recording apparatus comprising:

Further, according to the present invention, predetermined signal processing is performed on recording information divided in advance for each of a predetermined row and column of error correction, and processing record information composed of a plurality of recording units is stored. The information recording medium according to claim 1, wherein a position where additional recording is performed is a head position of a row of the error correction.

Further, the present invention has a structure in which record information is arranged after control information such as a sync code in the preset error correction row, and the position of additional recording is the error correction row. The recording medium is a position immediately after control information such as a sync code.

Further, the recording method includes a step of performing predetermined signal processing on recording information divided in advance in units of a predetermined row and column of error correction to generate processing recording information composed of a plurality of recording units. An information recording method for recording the processing recording information on an information recording medium, wherein the processing recording information is generated, and the position of the additional recording on the information recording medium is a position immediately after the error correction row. This is a recording method characterized by the following.

[0019] Further, the recording method includes the steps of:
A recording method in which recording information is arranged, wherein a position where additional recording is performed on an information recording medium is a position immediately after control information such as a sync code in a row of the error correction.

Further, the recording apparatus includes means for performing predetermined signal processing on recording information divided in advance for each of the predetermined row and column units of error correction, and processing the recording information comprising a plurality of recording units. Generating means, information recording means for recording the processing recording information on the information recording medium, and additional recording means for additionally recording on the information recording medium a position immediately after the error correction row. It is a recording device.

Further, the recording device may further include a control information such as a sync code in the predetermined error correction row.
A recording apparatus, wherein recording information is arranged, and a position where additional recording is performed on the information recording medium includes position additional recording means immediately after control information such as a sync code in a row of the error correction. is there.

Next, an information recording medium of the present invention, a recording method and a recording apparatus related to the present invention will be described with reference to the drawings. The following embodiment describes an embodiment in which the present invention is applied to an information recording apparatus for recording information on a DVD-RW. However, other additionally recordable CD-Rs and CDs can be used. -Needless to say, the present invention can be applied to a recording medium such as RW and DVD + RW.

[Embodiment of Recording Format]
First, an embodiment of a recording format used in the present invention will be described. First, a general physical format when recording information is recorded on a DVD-RW and an error correction process on the recording information will be described with reference to FIGS. 1, 2, and 3. FIG.

First, an error correction process in the DVD-RW according to the present embodiment and an ECC block as an error correction unit in the error correction process will be described with reference to FIG.

In general, the recording information recorded on the DVD-RW has a physical structure including a plurality of data sectors 20 shown in FIG. Then, in one data sector 20, from the head thereof, ID information 21 indicating the start position of the data sector 20, and the ID information 2
ID information error correction code (I
ED) 22, preliminary data (for example, CPM) 23, a data area 24 for storing main data to be recorded, and an error detection code (EDC) 25 for detecting an error in the data area 24. Recording information to be recorded is constituted by a plurality of consecutive data sectors 20.

Next, using this data sector 20, E
Processing for configuring a CC block will be described with reference to FIG. When configuring an ECC block using the data sector 20, as shown in FIG. 1B, first, one data sector 20 is divided horizontally into 172 bytes, and each divided data (this Is hereinafter referred to as a data block 33). At this time,
12 rows of data blocks 33 are arranged in the vertical direction.

A 10-byte ECC code (P code) is assigned to each of the horizontal data blocks 33 arranged in the vertical direction.
I (Pality In) code) 31 to the data block 33
To form one correction block 34. At this stage, 12 correction blocks 34 to which the ECC internal code 31 is added are arranged in the vertical direction. Thereafter, this process is repeated for 16 data sectors for 20 times. As a result, a correction block 34 of 192 rows is obtained.

Next, the above-mentioned correction block 34 of 192 lines is used.
Are arranged in the vertical direction, this time, the correction block 34 of 192 rows is vertically divided from the beginning for each byte, and 16 ECCs are applied to each divided data.
An outer code (PO (Pality Out) code) 32 is added. The ECC outer code 32 is also added to the ECC inner code 31 in the correction block 34.

By the above processing, one ECC block 30 including 16 data sectors 20 is formed as shown in FIG. At this time, one ECC block 30
The total amount of information contained in is: (172 + 10) bytes × (192 + 16) rows = 378
56 bytes, and the data recorded in the actual data area 24 is 2048 bytes × 16 = 32768 bytes.

The ECC block 3 shown in FIG.
0, 1-byte data is indicated by “D #. *”. For example, “D1.0” indicates 1-byte data arranged in the first row and the zeroth column, and “D190.
“170” indicates 1-byte data arranged in the 190th row and the 170th column. Therefore, the ECC code 31
Are arranged in the 172nd to 181st columns, and the ECC outer code 32 is arranged in the 192nd to 207th rows.

Further, one correction block 34 is a DVD-R
It is recorded continuously on W. Here, as shown in FIG. 1B, the ECC block 30 is divided into ECC inner codes 31 and ECC.
The configuration including both of the CC outer codes 32 is shown in FIG.
1B, the data arranged in the horizontal (horizontal) direction is corrected by the ECC inner code 31, and the data arranged in the vertical (vertical) direction in FIG. 1B is corrected by the ECC outer code 32. It is. That is, E shown in FIG.
In the CC block 30, it is possible to perform double error correction in the horizontal (horizontal) direction and the vertical (vertical) direction,
The configuration is such that error correction can be performed more strongly than error correction processing used for a conventional CD (Compact Disk) or the like.

More specifically on this point, for example,
One correction block 34 (as described above, one line of ECC
It contains a total of 182 bytes of data including the inner code 31, and is recorded continuously on the DVD-RW. ) Is up to 5 bytes, it can be corrected even if it is destroyed by a flaw or the like. However, if the entire row is destroyed by flaws or the like in a DVD-RW with 6 bytes or more, the ECC internal code 31 can correct it. Will be gone. However, even if all of the rows were destroyed by scratches or the like, when viewed from the vertical direction,
There is only one byte of data destruction for the ECC outer code 32 in the column. Therefore, if error correction is performed using the ECC outer code 32 in each column, even if all of one correction block 34 is destroyed, error correction can be performed correctly and reproduction can be performed accurately. However, taking into account the occurrence of acquired scratches and the like, it is needless to say that an increase in the number of scratches in a row (horizontal) leads to an error in the next row (horizontal) in the vertical direction. By the way,
This vertical error can be corrected even if there are 8 horizontal rows (16 rows by erasure correction).

Next, the ECC block 3 shown in FIG.
0 is a data sector 20
-How it is recorded in the RW will be described with reference to FIG. In FIG. 2, the data indicated by “D #. *” Corresponds to the data described in FIG. When recording the ECC block 30 on a DVD-RW, first, as shown in FIG.
The C blocks 30 are arranged in a line in the horizontal direction for each correction block 34 and interleaved, thereby being divided into 16 recording sectors 40. At this time,
One recording sector 40 includes 2366 bytes (37856 bytes ÷ 16) of information,
In this, the data sector 20 and the ECC inner code 31 or the ECC outer code 32 are mixed. However, at the beginning of each recording sector 40, ID information 21 (see FIG. 1A) in the data sector 20 is arranged.

Then, one recording sector 40
As shown in FIGS. 2B and 2C, is divided into data 41 of 91 bytes each, and a sink H is added to each.
After that, the recording sector 40 in this state is 8--
By performing the 16 modulation, one sync frame 42 is formed for each data 41. At this time, one sync frame 42 has a sync H ′ as shown in FIG.
And data 43. The amount of information in one sync frame 42 is 91 bytes × 8 × (16
/ 8) = 1456 bytes, and this sync frame 4
The information is written on the DVD-RW disc in a form in which 2 is continuous. At this time, one recording sector 40
Include 26 sync frames 42.

This will be described with reference to FIG. The leading sector of an ECC block consisting of 16 physical sectors is configured as shown in FIG. That is, the row is composed of 186 bytes of 172 bytes of data, 10 bytes of PI and 4 bytes of sync, and is composed of 13 rows obtained by adding one row of PO to 12 columns. Sync from H0 to H25
26 bytes.

By recording information on a DVD-RW disc by configuring the physical format described above, if the information is reproduced by 8-16 demodulation and deinterleaving (see FIG. 2), the original data can be obtained. Since the ECC block 30 can be restored and the amount of destroyed data blocks can be minimized, information can be reproduced most accurately by performing strong error correction as described above.

Next, referring to FIGS. 4 and 5, a description will be given of a position for additionally recording, that is, a linking position. FIG.
Is based on the ECC block conforming to the DVD-R standard shown in FIG. As shown in FIG. 4, here, the linking position L is defined as a range between 82 and 87 bytes from the beginning of the second sync H1 of the first sector of the ECC block. That is, the second sync frame sy2
Is a 2-byte second sink H1, 81-byte data,
Since it is composed of a 10-byte PI code (PI), linking is performed between the second and seventh bytes from the beginning of this PI. Before and after the linking position L, the phase or frequency of the recording data fluctuates (shifts). Therefore, when a clock is generated by a PLL or the like for the previous data to establish the data, the PLL cannot be locked, and the data becomes Reading may not be possible.

If the linking position L is, for example, the position of the 82nd byte from the head of the second sink H1, 82-9
The 10-byte data up to the first byte cannot be read. That is, the width of the linking position L is 6 bytes, and the PI column correction capability is 5 bytes as described above.
Since the number of bytes is up to bytes, the first row (that is, each data of the first and second sync frames sy1 and sy2) cannot be corrected. Next, the second row including the H2 sync (that is, each data of the third and fourth sync frames sy3 and sy4) is:
Until the sink position of the third sink H2 is reached, P
If the LL is locked, it can be read, but if there is a variation in frequency in addition to the phase, a signal of several tens of bytes is required for the PLL to pull in, and the third sink H2 cannot be detected. As a result, the data in the second row described above cannot be established, and this row cannot be corrected.

As described above, even if eight PI columns are broken, correction can be made by PO, so that data can be finally read. However, potentially having two rows of errors is problematic in that it is vulnerable to an increase in errors due to acquired factors.

FIG. 5 shows the specifications of a DVD-RW or the like which is an example of the information recording medium of the present invention. Here, the linking position L is 1 to 3 from the beginning of the data area immediately after the third sync H2 of the first sector of the ECC block.
It is defined as the range between bytes. That is, the width of the linking position L is 3 bytes (half of the case of FIG. 4 described above), and the third sync frame sy3 is a 2 byte third sync H2, 81 byte data, and 10 byte PI. Therefore, linking is performed using the first to third bytes from the head of the data area of the third sync frame sy3. This linking position L extends over the head data position (the third byte from the head of the data area) of the data area of the third sync frame sy3.

Before and after the linking position L, the phase or frequency of the recording data fluctuates (shifts). Therefore, when a clock is generated by a PLL or the like with respect to the previous data to establish the data, the PLL can be locked. Data may not be able to be read. If the linking position L is, for example, the position of the second byte from the beginning of the data area immediately after the third sync H3, 89 bytes of data between the 2nd and 91st bytes cannot be read. As described above, since the correction capability of the PI row is up to 5 bytes, the second row (that is, each data of the third and fourth sync frames sy3 and sy4) cannot be corrected. However, until the timing of the next third row (that is, each data of the fifth and sixth sync frames sy5 and sy6) is reached, even under the worst condition, the PLL is enough to pull in. As a result, the sink of the fourth sink H4 can be detected.
As a result, although it is not possible to establish the data in the second row, it is only in this second row that the error cannot be corrected, and as shown in FIG. It is possible to prevent data from being destroyed due to error correction of two rows in two rows. That is, P
The amount of destruction of the data in the I column can be reduced to half.

It has been described that the linking position L is provided at the third byte from the head of the data area of the third sync frame sy3. In addition, (1) the linking position L is the third sync frame sy3. (3) The linking position L is provided at the third byte from the head of the data area of the first sync frame sy1. , (3) Needless to say, the linking position L may be provided using 3 bytes from the top of the data area of the first sync frame sy3 to the 10th byte.

[Form of Information Recording Apparatus] Next, FIGS.
Information is stored in a DVD-R in a physical format having the “recording format form” described with reference to FIGS.
An embodiment of the information recording apparatus according to the present invention for recording in W will be described with reference to FIG. In the following embodiment, in the DVD-RW, pre-pits in which address information and the like on the DVD-RW are recorded are formed in advance on information tracks where recording information is to be recorded. The address information on the DVD-RW is obtained by detecting the pre-pits in advance, and the recording position on the DVD-RW where the recording information is to be recorded is detected and recorded.

Hereinafter, preferred embodiments of the information recording medium according to the present invention, the recording method related to the present invention, and the recording apparatus will be described in detail with reference to the drawings. First, the configuration of the recording apparatus will be described with reference to FIG.

FIG. 6 shows a schematic configuration of an optical disk device as a mode to which a recording medium, a recording method and a device are applied. In this embodiment, for example, M
A rewritable DVD-RW is used as an example of an optical disk that employs PEG2. In addition, in the configuration of FIG. 6, many parts usually provided in a so-called DVD device or the like are omitted.

In FIG. 6, the optical disk 1 is a recording type optical disk made of, for example, a phase change material. In this embodiment, for example, a so-called DVD-RW disk is used. In the DVD-RW disc, sectors (tracks) are spirally arranged in the disc, and a constant linear velocity (CL
The rotation is controlled by V), and one block is composed of continuous 16 sectors, and this one block is a processing unit (ECC block) of the error correction. The optical disc 1 is attached to the spindle motor 2 by a chucking mechanism (not shown).

The spindle motor 2 is driven to rotate by a driver 7 and rotates the optical disk 1 chucked by a chucking mechanism. The spindle motor 2 includes an FG generator and a rotation position signal detecting means such as a Hall element. The FG signal from the FG generator and the rotation position signal from the Hall element are fed back to the servo unit 8 via the driver 7 as a rotation servo signal.

The optical head 3 uses a semiconductor laser as a light source and forms a laser spot on a predetermined track of the optical disc 1 by using a collimator lens, an objective lens, and the like.
In addition, focusing and tracking of a laser spot are performed by driving an objective lens with a biaxial actuator. The semiconductor laser is driven by a laser drive circuit, and the biaxial actuator is driven by a driver 7.

The key input unit 10 includes a plurality of keys operated by the user, and sends key operation input information from the user to the system controller 9. That is, from the key input unit 10, recording start, reproduction start, recording stop,
Various key operation input information for instructing stop of reproduction and the like can be input by the user.

The interface unit 13 is an interface for transmitting / receiving data to / from a computer or the like, for example, a so-called ATAPI (ATA Packet).
Interface).

The system controller 9 includes the key input unit 1
As key operation input information starting from 0, according to various key operation input information such as recording start, reproduction start, recording stop, reproduction stop, etc., LSIs (signal processing unit 5, servo unit 8, amplifier unit 4) of each unit of the optical disk device. , AV coding / decoding unit 6). In addition, data is transmitted and received via the interface unit 13. For example, when the resolution of an image to be recorded or a high-speed scene such as a car race is selected, or when control data for setting with priority on the recording time is input from the key input unit 10 or the input terminal 12. , The system controller 9 recognizes the control data, changes the recording time based on the recognition result,
An external user can select the setting.

Here, for example, when a signal is reproduced from the optical disk 1, a reproduction start command is issued from the key input unit 10, and the system controller 9 at this time responds to the reproduction start command by an amplifier (to be described later). The control unit 4 controls the servo unit 8 and the driver 7. That is, the optical disk 1
When a signal is reproduced from the system controller 9
First, the optical disk 1 is rotated and a laser spot is irradiated on the optical disk 1, an address signal formed in advance on a signal track on the optical disk 1 is read, and a target sector to be reproduced from the address information is read. The optical head 3 is moved so that a laser spot is located on the target sector (track). After the movement to the target sector is completed, signal reproduction from the target sector is started.

The amplifier unit 4 during reproduction of the optical disk 1 amplifies the RF signal reproduced from the target sector of the optical disk 1 by the optical head 3, and reproduces a reproduction signal and a tracking and focusing servo signal (tracking signal) from the RF signal. Error and focus error signals). Further, the amplifier unit 4 includes an equalizer that optimizes at least the frequency characteristics of the reproduced signal, a PLL (phase lock loop) circuit that extracts a byte clock from the reproduced signal and generates a speed servo signal, and a signal from the PLL circuit. A jitter generator for extracting a jitter component from a comparison between the byte clock and the time axis of the reproduced signal.
The jitter value generated by the amplifier unit 4 is sent to the system controller 9, the tracking and focusing servo signal and the speed servo signal are sent to the servo unit 8, and the reproduction signal is sent to the signal processing unit 5.

The servo section 8 receives the velocity servo signal from the amplifier section 4 and the focusing and tracking servo signals of the optical head 3, and receives the spindle motor 2
And performs a servo control of a corresponding portion based on each of the servo signals. More specifically, the servo unit 8 controls the PL of the amplifier unit 4.
Based on the speed servo signal generated by the L circuit according to the disk rotation speed and the rotation servo signal from the spindle motor 2, the spindle motor 2 is rotated at a predetermined rotation speed, that is, the optical disk is rotated at a predetermined constant speed. A rotation speed servo control signal for rotating at a linear velocity is generated. Although details will be described later, in the present embodiment, recording / reproducing of the optical disc 1 at a recording speed (recording data transfer rate) / reproducing speed (reproducing data transfer rate) higher than the maximum data transfer rate during internal compression / expansion is performed. Playback is performed, and therefore, the servo unit 8
A rotation speed servo control signal for rotating the optical disk 1 at a constant linear speed matching the recording speed / reproduction speed is generated. Further, the servo unit 8 generates an optical head servo control signal for the optical head 3 to accurately perform focusing and tracking on the optical disc 1 based on the focusing and tracking servo signals. The rotation speed servo control signal and the optical head servo control signal are sent to the driver 7. Hereinafter, the recording speed (recording data transfer rate) of the optical disc 1 is referred to as a recording rate, and the reproducing speed (reproducing data transfer rate) of the optical disc 1 is referred to as a reproducing rate.

The driver 7 operates based on each servo control signal from the servo unit 8. The driver 7 rotates the spindle motor 2 in accordance with the rotation speed servo control signal from the servo unit 8, and controls the optical head servo. The two-axis actuator of the optical head 3 is driven according to the control signal.
In the present embodiment, the driver 7 drives the spindle motor 2 in accordance with the rotation speed servo control signal, thereby rotating the optical disc 1 at a predetermined linear speed.
The driver 7 drives the biaxial actuator of the optical head 3 according to the optical head servo control signal, so that focusing and tracking of the laser spot on the optical disk are performed.

The signal processing unit 5 during reproduction of the optical disc 1
The reproduction signal supplied from the amplifier unit 4 is A / D (analog / digital) converted, synchronization is detected from the digital signal obtained by the A / D conversion, and a so-called EFM + signal applied to the digital signal is converted. (8-1
6 modulated signals) to NRZ (Non Return to Zero) data, and further perform error correction processing.
The address data and the reproduction data of the sector on the optical disk 1 are obtained. The address data and the synchronization signal obtained by the signal processing unit 5 are sent to the system controller 9. The details of the error correction processing performed by the signal processing unit 5 will be described later.

Here, the reproduction data is, for example, MPEG
In the optical disk device of the present embodiment, the data is temporarily stored in, for example, a 64-Mbyte D-RAM (track buffer memory 7). By controlling the writing / reading of the data, the time variation of the variable transfer rate of the reproduced data is absorbed. The track buffer memory used is
This indicates a buffer memory for temporarily storing compressed data, and includes, for example, a buffer memory generally provided in a DVD for absorbing a variable transfer rate, and a buffer memory used for MPEG encoding and decoding. The management of the storage capacity and storage area of the track buffer memory 7 and the write / read control are as follows.
For example, the processing is performed by the system controller 9 via the signal processing unit 5.

The AV encoding / decoding section 6 at the time of reproducing the optical disk 1 converts the reproduced data supplied from the track buffer memory 7 into data obtained by compressing and encoding MPEG2, for example, and multiplexing audio data and video data. , The multiplexed compressed audio data and compressed video data are separated, and
The data is decompressed and decoded at 2, and D / A (digital / analog) converted, and output from the terminal 11 as an audio signal and a video signal. The video signal output from the terminal 11 is supplied to an NTSC (National Televisio) (not shown).
n System Committee) Processed by an encoder or the like and displayed on a monitor device, and the audio signal is sent to a speaker or the like (not shown) and emitted. Note that the speed of the decompression decoding by the AV encoding / decoding unit 6 at the time of this reproduction (the data transfer rate at the time of decompression decoding; hereinafter, referred to as the decompression rate) is the recording speed set at the time of recording, which will be described later. The expansion rate is set according to the mode. In other words, the AV encoding / decoding unit 6 is capable of performing expansion / decoding processing according to a plurality of expansion rates, determines the expansion rate in accordance with a recording mode set at the time of recording, and determines the expansion rate at that rate. Perform decompression decoding. The information of the recording mode is recorded on the optical disc 1 together with the recording data as control data, and the control data is read out when the optical disc 1 is reproduced and sent to the system controller 9. The decompression rate of the AV encoding / decoding section 6 is set. The D / A conversion can be performed outside the AV encoding / decoding unit 6.

On the other hand, when recording a signal on the optical disc 1, for example, a recording start command is issued from the key input unit 10, and the system controller 9 responds to the recording start command by the amplifier unit 4 and the servo unit 8. And the driver 7. That is, when performing signal recording on the optical disc 1, first, the optical disc 1 is rotated and a laser spot is irradiated onto the optical disc 1, and an address signal previously formed as a pre-pit on a signal track on the optical disc 1 is recorded. Is read, a target sector (track) to be recorded is found from the address information, and the optical head 3 is moved so that a laser spot is arranged on the target sector (track). The details of the address signal recorded in advance on the optical disc 1 will be described later.

Also, audio and video signals to be recorded are input from the terminal 11, and these signals are sent to the AV encoder / decoder 6. At the time of recording on the optical disc, the AV encoding / decoding unit 6 A / D converts the audio signal and the video signal, and converts the audio data and the video data into MPEG2 compression codes at a speed corresponding to a recording mode described later. And multiplexes them and sends them to the signal processing unit 5. Hereinafter, the speed of compression encoding (data transfer rate at the time of compression encoding) in the AV encoding / decoding unit 6 is referred to as a compression rate. That is, the AV encoding / decoding unit 6 can perform compression encoding at a plurality of compression rates according to the recording mode.

The D-RAM 8 of 16 Mbytes stores A
This is a memory for temporarily storing data at the time of compression / expansion in the V encoding / decoding section 6. This D-RAM8
May have a capacity of 64 Mbytes. Also, the A / D conversion can be performed outside the AV encoding / decoding unit 6.

The apparatus of the present embodiment can also record and reproduce still image information and data such as program files on a computer in addition to video and audio information. In this case, data such as still image information and a program file is supplied from the interface unit 13, and the data is sent to the signal processing unit 5 via the system controller 9.

At the time of recording on the optical disk, the signal processing section 5 adds an error correction code to the compressed data from the AV encoding / decoding section 6 and data such as a program file via the system controller 9 to generate an NRZ signal. And EFM +
, And further adds a synchronization signal supplied from the system controller 9 to generate recording data.

Here, the recording data is temporarily stored in the track buffer memory 7 and then read from the track buffer memory 7 at a reading rate corresponding to the recording rate on the optical disk 1. In addition,
The details of the management of the storage capacity and storage area of the track buffer memory 7 and the write / read control during this recording will be described later. The recording data read out from the track buffer memory 7 is subjected to a predetermined modulation process in the signal processing unit 5 and sent to the amplifier unit 3 as a recording signal. Track).

At this time, the system controller 9
A / D (analog / digital) converts and measures the jitter value from the amplifier unit 4, and changes the waveform correction amount in the amplifier unit 4 during recording according to the measured jitter value and asymmetry value. That is, when recording a signal on the optical disk 1, the amplifier unit 4 corrects the waveform of the signal from the signal processing unit 5 and sends the signal whose waveform has been corrected to the laser drive circuit of the optical head 4.

Next, the address of the data area on the optical disk 1 according to the embodiment of the present invention will be described below.

The optical disc 1 of the present embodiment is a DVD-RW disc that is compatible with DVD video, DVD audio, DVD-ROM, etc., and conforms to the DVD standard. Not only this DVD-RW, but also on a write-once or rewritable optical disk, the address of a sector is usually recorded or formed on the disk in advance in order to enable address control during recording. However, in the conventional optical disc, the address recording is performed by wobbling the groove according to the frequency modulated based on the address data. However, in the case of the DVD-RW of the present embodiment, the address recording is more performed. In order to enable high-speed and high-density recording, a so-called LPP (land pre-pit) for forming a predetermined pit in a land portion on an optical disk together with a wobbling frequency signal of the groove.
It also uses an address method.

Here, when data is actually recorded on the optical disk 1, a sector address (hereinafter simply referred to as an LPP address) by an LPP address which is recorded in advance on the optical disk 1 and is also a recording timing signal is used. Generally, a sector address (hereinafter, referred to as a data address) included in recording data to be actually recorded is made to match. As an example of data recording in which the LPP address and the data address match in this way, for example, there is a case where data reproduced from a normal DVD is entirely recorded on a DVD-RW. In this case, data is continuously recorded on the DVD-RW disc, and therefore, the relationship between the LPP address and the data address can be made to match.

Next, a description will be given of the operation of the additional recording performed in the embodiment of the present invention. In the present embodiment, as shown in FIG. 7A, one ECC block is composed of continuous 16 data sectors (32 kBytes) in the data area, and this ECC block is the minimum basic unit for recording and reproduction. It has become. Each data sector is composed of a sync frame having 26 syncs recorded in synchronization with an address composed of LPP and a sync timing signal for recording. In addition, DVD-
In the RW, sector addresses are formed at predetermined intervals.

Here, as shown in FIG. 7B, for example, as in the above-described intermittent recording using the track buffer memory 7, continuous data after the previously recorded area (data area) is newly added. In the case of recording, the data at the joint between the pre-recording and the post-recording becomes discontinuous. Therefore, in order to minimize the effect of the data discontinuity, as shown in FIG. 7C, for example, one of the third sync frame (3rd sync frame) of the first sector (physical sector; first sector) of the ECC block is used. The joint position is brought to the third byte from the byte. That is, the position of the joint is a linking position for performing linking. The third sync frame where the linking position L exists is a linking frame, and the leading sector including the linking frame is a linking sector.

As described above, when continuous data recording becomes discontinuous, linking is performed at that position in order to avoid the influence of the discontinuous portion. EC recorded before
Since the ECC block to be newly recorded is continuously connected to the C block, a linking position is set between the first and third bytes of the third sync frame in the first sector of the ECC block, and no data is lost by linking. In order to do so, the data recorded up to the second sync frame (2nd sync frame) is partially overwritten and overwritten as continuous data.

In the method shown in FIG. 7, the correction additional data (PI, PO) of the ECC block is generated in advance by using the above-described track buffer memory 7, and thereafter, the previous EC
Following the C block, the first, second,
LP up to the third sync frame sy1, sy2, sy3
Data is recorded on the basis of the timing of the P sync signal (the sync shown in FIG. 7A), and when the 3 byte signal for overwriting with the third sync signal is recorded, the data recording is started. Suspend. Thereafter, when a predetermined amount of data to be recorded in the track buffer memory 7 has accumulated, the pickup 3 is positioned again in the ECC block, and the timing of the third sync signal of the LPP corresponding to the third sync signal of the ECC block is adjusted. Detect
This can be realized by rewriting the 3-byte signal (linking position L) for overwriting again based on this timing and continuously recording data thereafter. When implementing the method of FIG. 7,
In order to perform the above-mentioned overwriting, it is necessary to partially overlap the data, so that the overlapping data portion is subjected to the overlap processing.

Since the linking position L is immediately after the LPP sync signal (third sync signal) as the recording timing signal and the recording timing can be accurately generated, the range of the linking position is smaller than that of the conventional linking method. In addition, it is possible to improve the accuracy of the deviation of the phase relationship between the connection of the front and rear signals, thereby improving the performance of the reproduction signal and reducing the loss area due to linking.

However, also in the method of FIG. 7, several bytes of the linking portion are destroyed by repeating the recording,
In the worst case during the stabilization time of the PLL circuit or the like of the reproducing circuit due to discontinuity of the phase or frequency before and after the recording,
A problem arises in that several to several hundred bytes of the linking part cannot be read.

For this reason, a management data area is provided inside the lead-in area of the optical disc 1, for example, in a so-called recording management area (RMA), and the linking position L at the time of recording is provided in this management data area.
Is recorded, and at the time of subsequent reproduction, a predetermined process as described later (change of a response characteristic for linking or window switching process) based on the information indicating the linking position L of the management data area. By doing
Basically, there is no loss of data, and it is possible to avoid the influence of data discontinuity due to the connection between recordings. In addition,
The information indicating the linking position L includes addresses of a start position and an end position of data recording in the management data area,
Alternatively, it is recorded separately from the area for recording the interval between the start position and the end of data recording. Also, the information indicating the linking position L can be recorded not only in the recording management area inside the lead-in area of the optical disc 1 but also in the data recording area as one of the control data and the control data, for example. It is.

In the recording operation, the upper limit capacity (full) of the track buffer memory 7 in the optical disk apparatus shown in FIG.
And the value of the lower limit capacity (empty) are set respectively,
The signal compressed by the encoding / decoding unit 6 is temporarily written into a 64 Mbyte track buffer memory 7 in a predetermined recording unit, and the operation of the optical head 3 is performed while managing the remaining capacity of the track buffer memory 7. To control. For example, at the time of recording on the optical disk 1, an error correction code, an address and a sync signal are added to the compressed data in the track buffer memory 7, and the laser power is modulated by the strategy circuit of the amplifier unit 4.
Is recorded on the optical disc 1 from the beginning.

When the recording is continued, the difference between the transfer rate of the input recording signal and the transfer rate of the recording signal to be recorded on the disk is determined by the track buffer memory 7.
When the capacity of the track buffer memory becomes the lower limit capacity (empty), the reading from the track buffer memory 7 is temporarily stopped,
The linking process is performed on the optical disc 1 to temporarily stop recording.

For this reason, in the optical disk device of FIG. 6, for example, an ECC for managing the ECC block at the linking position is stored in the built-in RAM area of the system controller 9.
A block management area is provided, and the ECC block address at the linking position is recorded by setting the byte corresponding to the linking position in the ECC block management area to, for example, “1”.

Next, when the remaining capacity of the track buffer memory 7 is restored and data can be read from the track buffer memory 7, the system controller 9
The linking process is started from the ECC block at the address corresponding to the linking position, and the recording is restarted. By repeating this operation, continuous recording is performed.

Next, when reproducing the optical disk 1 on which the above-described recording is performed, the following is performed. At the time of the reproduction, first, the management data area on the recording management area on the innermost circumference of the optical disc 1 is reproduced, and the system controller 9 reads the linking byte map from the reproduction data in the management data area.

That is, the system controller 9 reads the addresses of the data recording start position and the recording end position of the linking byte map arranged in the recording management data (RMD) described in the recording management area, and reads the addresses on the optical disc 1. Recognize the range of the area where the recording was performed.

Next, the system controller 9 reads the linking byte map, and stores and manages the linking byte map in a linking position management area provided in the built-in RAM. The system controller 9 converts the linking byte map stored in the linking position management area on the built-in RAM into an address position based on the address signal detected through the sync detection in the signal processing unit 5, and converts the converted address. The position is compared with the current address position, and it is calculated whether the address of the next ECC block to be reproduced contains linking.

Here, when the system controller 9 predicts that the ECC section to be reproduced next contains linking, it sends the information to the signal processing section 5 and the amplifier section 4 as described later. When the signal processing unit 5 and the amplifier unit 4 receive the linking information, based on the information,
Processing for interpolation, such as changing response characteristics for linking and switching windows, which will be described later, is performed. The details of the processing for interpolation in the signal processing unit 5 will be described later.

Further, in a different embodiment, in order to perform interpolation processing such as changing the response characteristic of the ECC unit including the linking and switching windows more easily, the linking byte map is used as described above. Instead of specifying an ECC block where linking is actually performed and performing interpolation processing on the ECC block, timing of a position corresponding to a position where linking of all ECC blocks is performed (hereinafter referred to as linking), as described later. (Referred to as position), an inexpensive device can be realized without the need for a linking position management 92 in the system controller 9 described later. in this case,
For DVD-RW, a playback-only D compatible with playback
Exactly the same ECC like VD-ROM format
For discs having a block structure, DVD-RW
Since there is no linking because overwriting is not performed as in the above, there is no need for interpolation processing at a position corresponding to the linking position. In such a case, the type of the disc is determined, and the above-described interpolation processing is performed only on the recording type disc such as the DVD-R or DVD-RW. A reproduction-only disc can maintain the same reproduction performance as the conventional one.

That is, at the time of reproduction, there is a high possibility that a part of the data is destroyed at the linking position L. Therefore, there is a place where the data of those bytes cannot be reproduced at the time of reproduction. Against this background, in the present embodiment, the data (signal) corresponding to the linking position
By taking special measures as described below, more reliable reproduction is realized.

As a first countermeasure against the data at the linking position L, a predetermined processing as described below is performed on the reproduction signal corresponding to the linking position L to realize a stable reproduction processing. A method is conceivable.

That is, since recording is performed intermittently at the linking position L, the signals before and after the reproduction signal corresponding to the linking position L include the amplitude, frequency, phase (temporal timing), asymmetry, The quality (jitter etc.) may have changed. In addition, missing bytes or unnecessary bytes may be generated.

Therefore, in the optical disk device of the present embodiment, when reproducing the optical disk, for example, the response characteristic of the PLL circuit is changed (for example, the response speed is increased) for the reproduction signal corresponding to the linking position. Alternatively, since there is a possibility that no data exists at the linking position L as in the case of a defect, for example, the PLL is locked in the partial section. (2) The slice level for binarizing the reproduced RF signal is changed. Changing (for example, changing the voltage at the slice level by inserting a transient waveform) or changing the response characteristics of the filter (feedback type low-pass filter) (for example, increasing the frequency characteristics and response speed); (3) AGC for adjusting gain of reproduced RF signal
(Automatic gain control) Switching the response characteristics of the circuit (for example, increasing the response speed), (4) Changing the equalizing characteristics of an equalizer (EQ) for adjusting the frequency characteristics of the reproduced RF signal, (5) Linking At the position, for example, there is a possibility that no data exists as in the case of a defect. Therefore, the drive output of the servo system is pre-held in that section, and (6) the recording phase is shifted at the linking position, so that the previous sync Since the timing of the next sync signal may be shifted from the signal, the sync signal may not enter the window of the sync signal expected to come next. By performing processing such as performing processing for expanding a window, stable reproduction processing is realized.

However, if a process such as raising the response characteristics as described above is performed on a normal reproduced signal, the performance may be degraded when, for example, an optical disk having a fingerprint or a scratch is reproduced. The predetermined processing of the above-mentioned coping methods (1) to (6) is performed only for the signal section corresponding to the linking position. Note that the optical disc apparatus has a configuration for performing the above-described switching of the response characteristics for the same purpose, for example, immediately after seeking to a target track or immediately after switching between recording and reproduction. Can be applied to the reproduction signal section corresponding to the linking position.

FIG. 8 shows an essential configuration of an optical disk device for realizing the above-described methods (1) to (6). In the example of FIG. 8, the amplifier unit (preamplifier) 4, signal processing unit 5, servo unit 8, and system controller 9 of FIG. 6 are extracted and the internal configuration thereof is shown.

In FIG. 8, the optical head (PU) 3
Is input to the AGC circuit 41 of the amplifier unit 4. The AGC circuit 41 automatically adjusts the reproduction RF signal from the optical head 3 to a predetermined signal level, and sends the reproduction RF signal after the gain adjustment to the equalizer 42. The equalizer 42 controls the reproduction R from the AGC circuit 41.
The frequency characteristic of the F signal is raised and sent to the binarization circuit 43. The binarization circuit 43 binarizes the reproduced RF signal from the equalizer 42 at a predetermined slice level, and
The value reproduction signal is sent to the PLL circuit 44. PLL circuit 44
In this case, the PLL is locked by the binary reproduction signal. The binary reproduced signal thus PLL-locked is sent to the signal processing unit 5.

The binary reproduced signal input to the signal processing unit 5 is first sent to the sync detector 51. In the sync detector 51, the above-described FIG.
The clock signal from the PLL is counted for the sink H ′ shown in (D), and a window signal (FIG. 11B) of the sink signal is generated at the timing of the next coming sync signal, and enters the window. The sync signal is assumed to be a normal sync signal, and if the next sync signal does not come to this window, a sync signal is generated as an interpolation sync. Since the sync timing of may have shifted,
Control is performed so that the sync window is widened from the conventional value and a sync signal is obtained in a wide range. Also, when linking is performed at the linking position of the ECC block as described later, the next sync timing after the linking may be similarly shifted. Therefore, information of the ECC block including the linking from the linking position management 92 is provided. When,
Based on the information from the address detection 52 and the information on the sync timing, the linking timing signal is sent to the sync detection 51 in the linking timing generation 54 to perform the operation of expanding the window of the next sync signal (FIG. 11).
(B4) w4). In a different example, the linking position management 92 is not provided. In all the ECC blocks, the linking timing signal is used to detect the sync of 51 in the linking timing generation 54 from the information from the address detection 52 and the information on the sync timing. An operation of expanding the window of the next sync signal is performed (FIG. 11B).
W4). As a result, the sync signal is detected stably,
A timing signal based on the sink is applied to an address detector 5.
2 to the linking timing generator 54. Further, a reproduction signal via the sync detector 51 is also sent to the address detector 52. The address detector 52 decodes the address included in the reproduction signal at the timing of the sink, and sends the decoded address to the system controller 9. The reproduced signal via the address detector 52 is sent to the data processor 53. The data processor 53 demodulates an EFM + signal and decodes the reproduced signal, which is a digital signal, into NRZ data, and further performs an error correction process to generate reproduced data.

The ECC block address management section 91 of the system controller 9 manages the address of each ECC block based on the address from the address detector 52, and the data processor of the signal processing section 5 uses the address of each ECC block. The data processing in 53 is controlled in units of ECC blocks. The linking position management unit 92 of the system controller 9
A timing signal corresponding to the linking position in the ECC block is generated based on the address from the ECC block and the information on the linking position extracted from the reproduction signal. The timing signal corresponding to the linking position in the ECC block is sent to the linking timing generator 54 of the signal processing unit 5.

The linking timing generator 54 receives the timing signal based on the sync supplied from the sync detector 51 and the timing signal corresponding to the linking position in the ECC block supplied from the linking position manager 92 of the system controller 9. As a result, (C) in FIG.
The linking timing signal shown in FIG. In a different example, the ECC block address management unit 91 of the system controller 9 manages the address of each ECC block based on the address from the address detector 52, and performs the data processing of the signal processing unit 5 based on the address of the ECC block. The data processing in the unit 53 is controlled in units of ECC blocks. Further, the system controller 9 does not have the linking position management unit 92, and generates a timing signal corresponding to a linking position in all ECC blocks from the address detector 52. The timing signal corresponding to the linking position in the ECC block is sent to the linking timing generator 54 of the signal processing unit 5.

That is, the linking timing generator 5
Reference numeral 4 denotes "H" and "H" shown in FIG. 9C for extracting a signal section corresponding to the linking position as shown in FIG. 9A from the reproduced RF signal shown in FIG. 9B. L "
A binary linking timing signal is generated. In the example of FIG. 9, the "L" portion of the linking timing signal corresponds to a signal section for extracting a signal section at the linking position from the reproduced RF signal. This linking timing signal is supplied to each of the switching control circuits 45 and 4 of the amplifier unit 4.
6, 47, and 48 to the hold circuit 81 of the servo circuit 8.

The linking timing generator 54
Sends a timing signal corresponding to the linking position to the sync detector 51, counts the clock signal from the PLL in the sync detector 51, and widens the sync window of the next incoming sync signal after linking to a wider value than the conventional value. Control is performed so that a sync signal can be obtained within the range. Also,
In a different example, the linking position management 92 is not provided, and in all the ECC blocks, a linking timing signal is sent to the sync detection 51 in the linking timing generation 54 from the information from the address detection 52 and the information on the sync timing. Then, an operation of widening the window of the next sync signal is performed.

At this time, the window at the linking position may be expanded as described above only when the disc type discriminating section 100 discriminates the disc as a recording type disc. That is, the apparatus determines the type of the disc when the disc is inserted. As a result, if the type of the disc is a read-only DVD-ROM, there is no linking, so that the control for expanding the window is not performed. If the disc type is a recordable DVD-R or DVD-RW, the linking position is set. Because there is a possibility that there is, control to expand the window is performed.

The switching control circuit 45 of the amplifier unit 4 has an AGC
This is a control circuit for switching control of the response characteristic of the circuit 41. In the section where the linking timing signal is "L", that is, in the signal section corresponding to the linking position, the reproduction RF
Control is performed to increase, for example, the response speed of the AGC to the signal.

The switching control circuit 46 of the amplifier section 4
A control circuit for changing an equalizing characteristic of the equalizer, in a section where the linking timing signal is “L”, that is, in a signal section corresponding to the linking position,
Control is performed to change the equalizing characteristics for the reproduced RF signal.

The switching control circuit 47 of the amplifier section 4 is a control circuit for changing and controlling the slice level of the binarization circuit 43 and the response characteristic of the filter, and the section in which the linking timing signal is "L", that is, the linking. In the signal section corresponding to the position, the voltage of the slice level for the reproduction RF signal or the process of increasing the response speed is changed, or
Control to increase the frequency characteristics and response speed of the filter.

The switching control circuit 48 of the amplifier unit 4 includes a PLL
A control circuit for changing and controlling the response characteristic of the circuit. In a section in which the linking timing signal is "L", that is, a signal section corresponding to the linking position, the response speed of the PLL circuit is increased, or in the vicinity of the linking position, Since the data may be disturbed, P
Control for locking the LL is performed.

Further, the servo section 8 includes at least a focus servo circuit 82, a tracking servo circuit 83, and a spindle servo circuit 84. The hold circuit 81 includes the focus servo circuit 82, the tracking servo circuit 83, and the spindle servo circuit. Each drive output 84 is controlled so as to output a pre-hold and a reference voltage in a section where the linking timing signal is “L”, that is, in a signal section corresponding to the linking position.

The optical disk device of the present embodiment has the configuration shown in FIG. 8 so that it is possible to realize the processing of the third countermeasure method in the signal section corresponding to the linking position. Note that each switching control circuit 45 of the amplifier unit 4,
The switching control in 46, 47, and 48 is to perform all switching control in a section (signal section corresponding to the linking position) in which the linking timing signal is “L”, or to perform any one of them. Either one of the two switching controls may be performed, or some of the switching controls may be adaptively combined.

In this embodiment, if data other than the linking position information, such as laser power, ambient temperature, and a strategy value at the time of recording, are recorded in the management data area, the data before and after the linking position can be obtained. The difference in the later data can be predicted, and as a result, the first
It is possible to more appropriately set the response characteristics and the like of each item in the coping method.

Here, from the linking position in FIG.
Even if the time until L is pulled in is required in the middle of the fourth sync frame in the worst case, the linking position is the head position immediately after the sync signal in the row of the ECC block. It has the advantage of being able to secure enough inside and not affecting the next column.

In this embodiment, the linking position is the head position of the second column in the horizontal row of the ECC block. However, the linking position may be located in the third column or later, or the important data such as the ID in the first column (CMP). ) May be used.

Another example of the optimization processing at the linking position during reproduction will be described with reference to FIG. At the linking position, after the previous recording data is recorded as shown in FIG. 11D, the new recording data is recorded as shown in FIG. 11E, so that the recorded data is shown in FIG.
As shown in FIG. 11, discontinuity occurs at the linking position. Therefore, at the time of reproduction, a timing corresponding to the linking position in the error correction block is generated, and based on this timing, before and after the linking position (for example, FIG.
It is necessary to optimize the reproduced information signal in the period indicated by w in (a) and its vicinity, or later (for example, in the period indicated by w4 in FIG. 11B and its vicinity).
The optimization control includes at least one of the following processes (a) to (e) before and after the linking position (for example, during a period indicated by w in FIG. 11A), or Perform multiple processes. (A) the response characteristic of the PLL circuit for the reproduced information signal, (b) the slice level for binarizing the reproduced RF signal, and (c)
Response characteristics of an AGC (automatic gain control) circuit for adjusting the gain of the reproduced RF signal, (d) equalizing characteristics of an equalizer (EQ) for adjusting the frequency characteristics of the reproduced RF signal, and (e) driving of the servo system. Hold output

After the linking position, the arrival position of the sync is shifted as shown in FIG. 11C, so that the window of the sync signal is controlled. Specifically, for example, FIG. , A process of increasing the window width as in the period indicated by w4.

The disc type discriminating section 100 discriminates between a recordable disc (DVD-RW, DVD-R, etc.) and a read-only disc (DVD-ROM, etc.). Although the example in which the recording process is performed has been described, as another example, the disc type discriminating unit 100 shown in FIG. Performing optimization control according to the result of discrimination of (recording / reproducing characteristics), for example, selecting and combining the above-described optimization processes (a) to (e) based on the result of disc type discrimination, It is also possible to variably set the window width of the window w4 of the sync signal based on the result of disc type determination.

In the above description, an example using a linking byte map has been described. However, a linking bit map may be used.

[0111]

As described above, according to the present invention,
A specific sync frame in a specific sector of the error correction block (for example, near the leading end of the data area in the second sync frame of the first sector, specifically, from the first byte to the third byte of this data area) An information recording in which a linking portion (linking position) is set in 3 bytes of the data area or 3 bytes from the 1st byte to the 10th byte of this data area, and new information is additionally recorded after the already recorded information. As a result, a medium can be obtained. As a result, when the information recording medium is reproduced, even if the reproduction scanning is performed on the linking position, after two sync frame periods have elapsed from the sync frame where the linking position exists. It is possible to obtain high-quality reproduction data with no frequency or phase shift, and to compare the already recorded information with the additional information The connecting reproduction can be improved, further, can be compared to that of conventional, to provide an information recording medium which can be halved the amount of non-reproducible data at the linking position.

[Brief description of the drawings]

FIG. 1 shows E in recording information recorded on a DVD-RW.
FIG. 3 is a diagram illustrating a structure of a CC block.

FIG. 2 is a diagram showing a physical format of recording information recorded on a DVD-RW.

FIG. 3 is a diagram showing a physical format of one sector.

FIG. 4 is a diagram showing a physical format including a conventional linking position of one sector.

FIG. 5 is a diagram showing a physical format including a linking position of one sector in the information recording medium of the present invention.

FIG. 6 is a block diagram illustrating a schematic configuration of an optical disc device.

FIG. 7 is a diagram for explaining the relationship between the configuration of an ECC block and linking.

FIG. 8 is a block diagram illustrating a configuration of a main part when a first coping method of the optical disc device is realized.

FIG. 9 is a waveform diagram used to explain a linking timing signal for extracting a signal section corresponding to a linking position from a reproduced RF signal.

FIG. 10 is a block diagram showing another configuration of a main part when the first coping method of the optical disc device is realized.

FIG. 11 is a diagram for explaining processing at a linking position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk (recording medium), 2 ... Spindle motor, 3 ... Optical head, 4 ... Amplifier part, 5 ... Signal processing part, 6 ... AV encoding / decoding part, 7 ... Track buffer memory, 8 ... 16 Mbyte D- RAM 9 System controller 10 Key input unit 11 Audio / video signal input / output terminal 12 Control data input terminal 13 ATAPI interface unit 100 Disk type determination unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 27/034 H04N 5/85 Z 5D110 H04N 5/85 5/91 N 5/91 G11B 27/02 KF Terms (reference) 5B065 BA03 ZA06 5C052 AA02 AB05 CC01 DD04 5C053 FA24 GB05 GB38 JA24 KA01 KA07 KA24 5D044 BC05 CC06 DE02 DE25 DE28 DE37 DE57 DE58 EF05 GK12 5D090 AA01 BB03 CC01 CC14 DD03 FF34 GG02 DC10 DC17 GG02 DC10

Claims (1)

[Claims] 1. An information recording medium, wherein a recording end position or a linking position which is a head position of additional recording is provided at a specific position in the error correction block when information is recorded in units of error correction blocks. The error correction block includes a predetermined number of sectors; each sector includes a sync frame including a predetermined number of syncs; a plurality of horizontal correction blocks including data and parity in the plurality of sync frames; The linking position is the head of the data area of the first sync frame of the specific horizontal correction blocks of the plurality of sync frames. An information recording medium provided near a position.