JPH117706A - Optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a reproduction time by reading first data after sectors next to an error sector when the error sector occurs while a plurality of sectors of a range not filling one round of a track are being reproduced, and reproducing the error sector when an apparatus reaches the error sector. SOLUTION: When an error sector that cannot be corrected occurs during reading of sector data, a system controller 14 calculates a time passed after the error sector and calculates an estimated wait time from a sector being read to the error sector. When the apparatus while continuing the reading reaches immediately before an estimated position, a focus tracking control circuit 6 is controlled to move the apparatus to an inner circumference of the track. When the apparatus comes to a position of the error sector, the apparatus reads data again with monitoring sector numbers and reloads a correction and buffer RAM 10. After the reloading, a correction process and an EDC(error detection code) check for blocks are carried out again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for reproducing an optical disk on which digitally encoded video data and audio data are recorded.

[0002]

2. Description of the Related Art As is well known, in recent years, various types of information storage media represented by, for example, tapes, disks, and semiconductor memories have been developed and appeared on the market. Of these, optical R using an optical disc as a ROM (Read Only Memory)
OM disks are widely used as information recording media for music, computers, game machines, and the like. And among these optical ROM disks, CD (Compa
ct Disk) -ROM has a large recording capacity and is economically advantageous and easy to handle, so it is a medium for distributing large-capacity application software, especially for users of general PCs (Personal Computers). It is rapidly penetrating in the meantime.

In recent years, a DVD (digital video disk, digital versatile disk) standard has appeared as a standard for next-generation high-density optical disks. A DVD-ROM disc developed to apply the DVD standard to a recording medium for a computer is:
While having the same diameter as CD-ROM, high-density recording technology,
Improvements in short-wavelength laser and other reproduction technologies, as well as in multi-layer optical disc technology, have made it possible to achieve even larger capacities than CD-ROMs, and can store several gigabytes of digital information on a single disc. It has become.

By the way, a disk reproducing apparatus for reproducing data from such an optical ROM disk usually reads out data requested by a host computer or the like connected to the disk reproducing apparatus from the optical disk and performs correction processing and the like. After that, the data is transferred to the request source. At this time, it is an important issue how quickly the requested data can be transferred to the request source. For such problems, the read speed from the optical disk has been increased by setting the rotational speed of the optical disk to n times the standard speed, or data other than the requested data is pre-read from the optical disk and stored in the disk reproducing device. Various remedies have been tried.

An optical disk used in such a disk reproducing apparatus has concentric or spiral tracks (grooves and grooves), and the tracks (grooves).
Only the data is recorded, the diameter is 12 cm, and the recording capacity is 4.3 GB.

[0006] A track of an optical disc has an ECC (error correction code) block data unit (for example, 38688 bytes) as a data recording unit.
Data is recorded in advance.

The ECC block is composed of 16 sectors in which 2 Kbytes of data are recorded, and each sector has 2 bytes of 4-byte (32-bit) sector IDs (identification data) 1 to ID16 as address data. A horizontal ECC (error) is added to main data (sector data) together with an error detection code (EDC code: error detection code) having a configuration and serves as an error correction code for reproducing data recorded in an ECC block.
correction code) 1 and ECC2 in the vertical direction are recorded. The ECC is an error correction code added to data as a redundant word in order to prevent the data from being unable to be reproduced due to a defect of the optical disk.

Each sector is composed of 12 rows of data of 172 bytes, and a horizontal ECC1 of 10 bytes is provided for each row, and a vertical ECC2 of one row of 182 bytes is provided for each row. Have been.

When the ECC block is recorded on the optical disk, byte synchronization is performed when data is reproduced for each predetermined data amount of each sector (for each predetermined data length interval, for example, 91 bytes: 1456 channel bits). A synchronization code (2 bytes: 32 channel bits) to be taken is given.

The data read from the optical disk is once written into a correction / buffer RAM, where the data is read.
Correction processing is performed according to the VD standard. In the case of a DVD, the physical sector is a unit of 2366 bytes (a unit of 2418 bytes including a synchronization code), but for correction, 16 sectors are used as one correction block unit (sector 0).
15) A correction process is performed. Each sector has E
Since a DC code is added, it is possible to determine the presence or absence of an error by performing an EDC check after the correction processing is completed.

In FIGS. 9A, 9B and 9C, the sector (14) [A to B] of the block (n) is read out.
When the subsequent sector (15) [B to C] is read from the optical disk and stored in the correction / buffer RAM, the correction processing of block (n) and the EDC check are performed. Here, if the error correction of the sector (14) in the block (n) is not completed, or if the EDC check determines that there is an error even if the correction is completed, the host computer proceeds to the block (n) sector (14). It is determined that re-reading is necessary, and when the reading of the sector (1) of the block (n + 1) currently being read from the optical disk and the correction and writing to the buffer RAM are completed [D], the re-reading process is started. The system controller manages the total sector number from the head of the recording area of the optical disc recorded in the header portion of each sector.

In the re-reading process, first, immediately after the correction of the sector (1) of the block (n + 1) and the writing to the buffer RAM are completed, the focus tracking control circuit is controlled to read the track to the inner circumference of one track by the lens kick. [D → E]. Immediately after the movement, after the servo is stabilized, while monitoring the sector number, it waits for about one round until it reaches the position of the sector (14) of the target block (n) [EA]. When the position reaches the sector (14), the data is read again [A to
B].

In the correction / buffer RAM, the data of the block (n) in the previous read is held from the address p, and only the data of the sector (14) re-read in one sector from the address q in the data is stored. Rewriting is performed. When the rewriting is completed, the correction process for the block (n) and the EDC check for each sector are performed again. At the same time, the reading of the disk data is resumed from the sector (2) of the block (n + 1) interrupted last time.

FIG. 10 shows a processing flow of a conventional reread operation. That is, if an uncorrectable error sector occurs during the reading of the sector data (c1, c3), after the reading of the sector currently being read is completed (c
4) One track inner circumference is kicked (c5). Then, the sector number is monitored (c6), and when the position of the uncorrectable error sector is reached (c7), rereading of the uncorrectable error sector is started. The data read at this time is written to the area on the buffer RAM where the uncorrectable error sector is recorded (c8). When the reading is completed (c9), the sector number is monitored again (c1).
0), when reaching the point where the reading was interrupted before the kick (cll), the data reading is restarted (c12). If a factor such as a buffer full occurs during the reading of the sector data (c1, c2), the reading of the disk data is interrupted.

[0015]

However, as described above, during the reading of data from the optical disk, error correction or ED
When it is determined from the C check result that the correction is not possible and the sector data is read again,
A rotation wait of about one rotation occurs until the track reaches the inner circumference and then reaches the corresponding sector position. During that time, reading of the disk data is interrupted, which causes a problem that the reading speed of the disk data is reduced. ing.

Therefore, the present invention has been made in view of the above circumstances, and when reproducing from an optical disk to a plurality of sectors in a range less than one round of a track, when an uncorrectable error sector occurs in the middle of the reproduction. However, it is an object of the present invention to provide an optical disk device capable of preventing a long reproduction time.

[0017]

An optical disk apparatus according to the present invention has a concentric or spiral track on which data is recorded, has a predetermined track length, and records address data indicating a position on the track. A format having a plurality of continuous sector areas including a plurality of address areas and a recording area in which recording data is recorded is defined, and is formed of a set of a predetermined number of sector areas among the plurality of sector areas, Error correction data for reproducing the recording data recorded in the predetermined number of sector areas is recorded in block area units including an error correction data recording area which is collectively recorded for a group of the predetermined number of sector areas. For playing back recorded data on an optical disc on which A reproducing means for reproducing data stored in a plurality of sectors in a range less than one round of the track when reproducing data recorded in a predetermined sector; Correction means for reproducing the address data, recording data, and error correction data of the sector to correct the error; determining means for determining an error sector which cannot be corrected by the correction means or in which the address data corrected by the correction means is incorrect; When the error sector is determined by the determination unit, the error sector is skipped, the first sector is reproduced by the reproduction unit and the first processing unit is corrected by the correction unit with respect to the next sector on the same track, and the first processing unit. After the processing by the processing means is completed, the reproduction position by the reproduction means is set to the error section. By returning the playback position to the previous track by a track jump when the current position is closer to the position, the reproduction by the reproduction unit and the correction by the correction unit for the sector determined to be an error sector by the determination unit can be performed. And second processing means.

An optical disk device according to the present invention has concentric or spiral tracks on which data is recorded, has a predetermined track length, and has an address area for recording address data indicating a position on the track. A format having a plurality of continuous sector areas including a recording area in which data is recorded is defined, and is formed of a set of a predetermined number of sector areas of the plurality of sector areas. The error correction data for reproducing the recording data recorded on the optical disk is recorded on a block area unit including the error correction data recording area which is collectively recorded on a set of a predetermined number of sector areas. In reproducing the recorded data, the data recorded on the optical disc is reproduced. Reproducing means for reproducing a plurality of sectors in a range less than one round of the track when reproducing data recorded in a predetermined sector; and reproducing address data of all sectors in a block area including the sector when reproducing the data. Correction means for reproducing the recorded data and the error-corrected data to correct the errors; determining means for determining a plurality of error sectors which cannot be corrected by the correcting means or in which the address data corrected by the correcting means are incorrect; Every time an error sector is determined by the means, the error sector is skipped, the first sector is reproduced by the reproducing unit and the first process is corrected by the correcting unit with respect to the next sector on the same track and thereafter, and the first processing. After completion of the processing by the means, the reproduction position by the reproducing means is changed to the first error sector. By returning the playback position to the previous track by a track jump when it comes to the position before the placement, the plurality of sectors determined to be error sectors by the determination unit are reproduced by the reproduction unit and corrected by the correction unit. It comprises a second processing means in which corrections are made sequentially.

An optical disk device according to the present invention has concentric or spiral tracks on which data is recorded, has a predetermined track length, and has an address area for recording address data indicating a position on the track and a recording area. A format having a plurality of continuous sector areas including a recording area in which data is recorded is defined, and is formed of a set of a predetermined number of sector areas of the plurality of sector areas. The error correction data for reproducing the recording data recorded on the optical disk is recorded on a block area unit including the error correction data recording area which is collectively recorded on a set of a predetermined number of sector areas. In reproducing the recorded data, the data recorded on the optical disc is reproduced. Reproducing means for reproducing a plurality of sectors in a range less than one round of the track when reproducing data recorded in a predetermined sector; and reproducing address data of all sectors in a block area including the sector when reproducing the data. Correction means for reproducing and correcting the error by reproducing the recorded data and the error correction data; storage means for sequentially storing the address data and the recording data in sector units corrected by the correction means; Judgment means for judging an error sector in which the address data corrected by the correction means is erroneous. When an error sector is judged by this judgment means, the error sector is skipped and reproduction by the reproduction means for the next sector on the same track and thereafter is performed. The correction by the correction means and the storage by the storage means The processing means, after the processing by the first processing means, when the reproduction position by the reproduction means comes before the error sector position, the reproduction position is returned to the previous track by a track jump. The second processing means performs reproduction by the reproduction means, correction by the correction means, storage by the storage means, and processing after the processing by the second processing means for the sector determined to be an error sector by the determination means. And output means for outputting, as a reproduction result, recorded data of a predetermined sector stored in the storage means.

An optical disk device according to the present invention has concentric or spiral tracks on which data is recorded, has a predetermined track length, and has an address area for recording address data indicating a position on the track and a recording area. A format having a plurality of continuous sector areas including a recording area in which data is recorded is defined, and is formed of a set of a predetermined number of sector areas of the plurality of sector areas. The error correction data for reproducing the recording data recorded on the optical disk is recorded on a block area unit including the error correction data recording area which is collectively recorded on a set of a predetermined number of sector areas. In reproducing the recorded data, the data recorded on the optical disc is reproduced. Reproducing means for reproducing a plurality of sectors in a range less than one round of the track when reproducing data recorded in a predetermined sector; and reproducing address data of all sectors in a block area including the sector when reproducing the data. Correction means for reproducing the recorded data and the error correction data to correct the error, storage means for sequentially storing the address data and the recording data in the sector unit corrected by the correction means, Determining means for determining a plurality of error sectors in which the address data corrected by the correcting means are erroneous; each time the determining means determines an error sector, the error sector is skipped and the reproducing means for the next sector and subsequent sectors on the same track. Playback, correction by the correction means, and storage by the storage means. A first processing means to be executed, after the processing by the first processing means is completed, when the reproduction position by the reproduction means is short of the first error sector position, the reproduction position is shifted by one track jump. A second processing unit in which reproduction by the reproduction unit, correction by the correction unit, and storage by the storage unit are sequentially performed on the plurality of sectors determined to be error sectors by the determination unit,
And output means for outputting the recorded data of the predetermined sector stored in the storage means as a reproduction result after the processing by the second processing means.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the reproduction of data recorded on an optical disc (DVD: digital video disc, digital versatile disc) 1 as a recording medium according to the present invention by using focused light (laser light) from one side. 1 shows an optical disk device that performs the following.

The optical disc 1 has concentric or spiral tracks (grooves and grooves), and data is recorded only on the tracks (grooves). The optical disc 1 has a diameter of 12 cm and a recording capacity of 12 cm. It is 4.3 GB.

On the track of the optical disk 1, data is recorded in advance for each ECC (error correction code) block data unit (for example, 38688 bytes) as a data recording unit.

The ECC block is composed of 16 sectors in which 4 Kbytes of data are recorded. As shown in FIG. 2, sector IDs 1 to 16 each having a 4-byte (32-bit) structure as address data are provided for each sector. A horizontal ECC (er) is added to main data (sector data) together with an error detection code (EDC: error detection code) having a 2-byte configuration and serves as an error correction code for reproducing data recorded in an ECC block.
ror correction code) 1 and the vertical ECC 2 are recorded. The ECC is an error correction code added to data as a redundant word in order to prevent data from being unable to be reproduced due to a defect in the optical disc 1.

Each sector is composed of 12 rows of data of 172 bytes, and a horizontal ECC 1 of 10 bytes is provided for each row, and a vertical ECC 2 of one row of 182 bytes is provided for each row. Have been.

When the ECC block is recorded on the optical disk 1, as shown in FIG. 3, when the data is reproduced for each predetermined data amount of each sector (every predetermined data length interval, for example, every 91 bytes). Is provided with a synchronization code (2 bytes) for byte synchronization.

As the sector data, for example, MP
2048-bit pack data in the EG2 system layer is recorded. As the pack data, main video data, sub video data, and audio data as moving image data are recorded.

The optical disk 1 is, as shown in FIG.
The recorded information is read by the optical pickup 2. The signal read by this optical pickup 2 is R
F (Radio Frequency) is supplied to the amplifier 3 and the focus tracking control circuit 6, respectively. The RF amplifier 3 amplifies the signal output from the optical pickup 2 and converts the RF signal into a level slice PLL (Phase L).
(ocked Loop) output to the circuit 4.

The focus tracking control circuit 6
Is based on the signal output from the optical pickup 2
A focus error signal and a tracking error signal required for focus servo and tracking servo for an objective lens (not shown) built in the optical pickup 2 are generated. The focus tracking control circuit 6 controls an actuator (not shown) for driving the objective lens in the focus direction and the tracking direction based on the focus error signal.

The focus tracking control circuit 6
Controls the actuator by the instruction of the system controller 14 to control the movement of the readout track due to the lens kick, and controls the instantaneous movement to the target track within a range of about ± 100 tracks.

The optical pickup 2 is moved in the radial direction of the optical disk 1 by a feed motor 8. The feed motor 8 is controlled by a feed motor control circuit 7 to which a tracking error signal output from the focus tracking control circuit 6 and a search instruction signal output from the system controller 14 are input.

Further, the level slice PLL circuit 4
After binarizing the input RF signal, it generates data in which one byte of the 8-16 modulated data has 16 bits, and also generates a PLL clock synchronized with the 16-bit data. The level slice PLL circuit 4 converts the 16-bit data and its PLL clock into
The signal is output to the DVD signal processing circuit 5. The DVD signal processing circuit 5 detects a periodic synchronization signal using the input PLL clock, thereby obtaining a CLV (Constantial synchronization signal).
t Linear Velocity) control signal is generated and output to the disk motor control circuit 11. The disk motor control circuit 11 performs the following based on the input CLV control signal.
The rotation speed of a disk motor 9 for rotating the optical disk 1 is controlled.

The DVD signal processing circuit 5 has a PL
Using the L clock, the input 16-bit data is
The original 1 byte is demodulated into data consisting of 8 bits. The DVD signal processing circuit 5 corrects and demodulates the demodulated 8-bit data using a PLL clock.
The data is written to "0" to perform an error correction process, and the data on which the error correction process is completed is transferred to a host computer (not shown) via the host I / F control circuit 13.

The host I / F control circuit 13
It also controls communication with the host computer. The re-read position determination unit 15 calculates a position to reach an uncorrectable error sector while reading the disk data. The clock generation circuit 12 generates a clock of a reference frequency obtained by dividing the oscillation frequency from the crystal oscillator, and the clock is a DVD signal processing circuit 5, a disk motor control circuit 11, a host I / F Output to the control circuit 13.

The operation of the optical disk device is controlled by the system controller 14 as a whole. next,
In the above-described configuration, when reproducing from the optical disc 1 to a plurality of sectors in a range less than one round of a track, a process when one uncorrectable error sector occurs in the middle is shown in FIG. ) (B) (c) and FIG.
This will be described with reference to the flowchart shown in FIG.

FIGS. 4A, 4B and 4C show a reading method when reading from the optical disk 1 again. 4A shows the read position on the optical disk 1, FIG. 4B shows the correspondence between the read position on the optical disk 1, the read contents, and the correction operation, and FIG. The storage status of data on the buffer RAM 10 is shown.

As described above, the data read from the optical disk 1 is once written into the correction / buffer RAM 10, where the correction process is performed in accordance with the DVD standard. In the case of a DVD, the physical sector is in units of 2366 bytes, but for correction, correction processing is executed with 16 sectors as one correction block unit (sectors 0 to 15 in the figure). Each sector has a sector ID and an error detection code (EDC code) added thereto.
By performing an EDC check using the sector ID and the error detection code, the presence or absence of an error is determined.

In FIG. 4B, the sector (14) [C-D] of the block (n) is read, and the succeeding sector (15) [D-] is read from the optical disk 1 and corrected. When stored in the buffer RAM 10, the block (n) is corrected and an EDC check is performed.
Here, whether the error correction of the sector (14) in the block (n) has not been completed, or even if the correction has been completed, an error has occurred in the EDC check, and it is determined that the error sector cannot be corrected. Is block (n)
It is determined that re-reading of the sector (14) is necessary, and the re-reading process is started. The system controller 14
Is managed by the total sector number from the head of the recording area of the optical disk 1 recorded in the header part of each sector.

In the rereading process, the disk data is read out without moving the track immediately,
Correction processing and EDC check are performed for each correction block.
Further, the position of the uncorrectable error sector (actually, 1
The time (distance) to reach the outer periphery of the track is calculated.

First, the absolute time from the beginning of the data area is T (the absolute time T is converted from the sector number to the total number of sectors from the data area, and the time per sector (= 1.
47msec), the distance S from the center
Is obtained by the following approximate expression.

S = (Ri ² + TpVT / π) ^1/2 track pitch: Tp = 0.74 μm Linear velocity: V = 3.49 m / s Distance from center to innermost circumference of data area: Ri = 24 m
m Therefore, the number of sectors Nr of the track circumference at the current reading position is 5.1 in the track direction length of one sector.
Since it is 5 mm, Nr = 2πS / 5.15 × 10 ⁻³ , and the number of sectors Nk up to the kick position is Nk = Nr − ((current sector NO.) − (Uncorrectable sector NO.)) − Nm. Become. Here, Nm is the number of sectors (margin until the data can be read) in consideration of the time from when the kick is executed to when the servo becomes stable and the data can be read. Therefore, the actual kick position Nj is obtained from Nj = (current sector No.) + Nk.

In this embodiment, these calculations are performed by the re-read position determination section 15 in FIG. 1, but the system controller 14 can also calculate them by software.

Next, while continuing to read the disk data, the sector NO. = Nj, the system controller 14 controls the focus tracking control circuit 6 to move the read track to the inner circumference of one track by the lens kick [A → B]. Immediately after the movement, when the servo has stabilized and the robot arrives at the position of the sector (14) of the target block (n) while monitoring the sector number, [B ...
C]. The data is read again [C to D].

In the correction / buffer RAM 10, the data of the block (n) in the previous reading is held from the address p, and only the data of the sector (14) re-read in one sector from the address q in the data is stored. Rewriting is performed. When the rewriting is completed, the correction process for the block (n) and the EDC check for each sector are performed again.

FIG. 5 shows a processing flow of the reread operation in the first embodiment. That is, if an uncorrectable error sector occurs during the reading of the sector data (al) (a3), first, the elapsed time from the uncorrectable error sector is calculated (a4), and taking this into account, the current reading is performed. The estimated waiting time (distance) from the sector to the uncorrectable error sector is calculated (a5). Current sector NO. Continue reading the current disk data while monitoring
6).

After the reproduction for the designated sector is completed, if the reproduction reaches the position immediately before the estimated position (a7), 1
The track is kicked and moved (a8). After the servo is stabilized, the current sector NO. While monitoring (a9), when the position of the uncorrectable error sector is reached (a10), the uncorrectable error sector is reread, and only the q data in the correction and buffer RAM 10 is rewritten (a
11). When the rewriting is completed (al2), the correction processing for the block (n) and the E for each sector are performed again.
A DC check is performed.

When a factor such as a buffer full occurs, the reading of the disk data is interrupted (a2).
As described above, when reproducing from the optical disc to a plurality of sectors in a range less than one round of the track, even if an error sector occurs on the way, the error sector caused by performing the track jump at this point is determined. Because the error sector is skipped, data is read ahead from the next sector without replaying, and then a track jump is performed when approaching the error sector to reproduce the error sector. When the reproduction of the sector is completed, the reproduction of the desired sector can be completed, and the reproduction time can be shortened.

That is, when reproducing a plurality of sectors in a range less than one round of the track from the optical disk,
Even if an error sector occurs on the way, the track jump is not performed at this point, so that it is possible to prevent the reproduction time from being significantly increased.

For example, when performing reproduction from the first sector of the A block at the start of reproduction to the last sector of the B block at the end of reproduction, in this embodiment, as shown in FIG. Even if there is a sector, after the reproduction up to the last sector of the B block at the end of reproduction,
In other words, after pre-reading, when the disk is rotated to the vicinity of the error sector, re-reading is performed by performing a track jump. As shown in FIG. In this case, a track jump is performed at this time, and after approximately one revolution, the error sector is re-read, and then the reproduction to the last sector of the B block at the end of the reproduction is performed.
This embodiment has a shorter reproduction processing time than the conventional one.

In the above example, the case where the number of error sectors is one has been described. In this case, when an error sector occurs, the system controller 14 stores the sector number, skips the process for that sector, and shifts to the process for the next sector. Next, the same processing is performed when an error sector occurs.

After the reproduction of the specified sector is completed, when the head reaches the position immediately before the estimated position of the first error sector, it moves by kicking the inner circumference of one track. When the current uncorrectable error sector position is reached while monitoring the current sector number after the servo is stabilized, the uncorrectable error sector is re-read, error correction processing is performed, and the error sector is stored in the correction / buffer RAM 10. . Thereafter, while sequentially monitoring the sector number of this track, when the position of the next uncorrectable error sector is sequentially reached, the uncorrectable error sector is re-read, the error correction process is performed, and the error sector is stored in the correction / buffer RAM 10. I do.

In this case, when reproducing from the optical disk to a plurality of sectors in a range less than one round of the track,
Even if an uncorrectable error sector occurs in the middle, the error sector is not reproduced by performing a track jump at this point (repeatedly), and the error sector is skipped and the next sector and thereafter are skipped. Data is read in advance, and then, when a track jump is performed near the first error sector, the first error sector is reproduced, and thereafter, the other error sectors are reproduced. At the end, the reproduction of the desired sector can be completed, and the reproduction time can be reduced.

That is, when reproducing a plurality of sectors in a range less than one track round from the optical disk,
Even if multiple error sectors occur on the way,
Since the track jump is not performed at that time, it is possible to prevent the reproduction time from being significantly increased.

Thus, when re-reading the sector data read immediately before due to, for example, uncorrectability, it is possible to reduce the rotation waiting time for nothing and to improve the data pre-reading efficiency.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 shows an optical disk device according to the second embodiment. The same reference numerals are given to the same portions as those in the optical disk device according to the first embodiment shown in FIG.

That is, a read margin determining unit 16 is provided. The read margin determining unit 16 measures a margin from the time when the track is moved by the lens kick to the time when the servo is stabilized to start reading data. This is to incorporate it into the calculation of the arrival position to the uncorrectable error sector.

In the above configuration, when the track is moved to the uncorrectable error sector position as in the first embodiment, the number of sectors Nk up to the kick position is determined.
Is obtained from Nk = Nr-((current sector No.)-(Uncorrectable sector No.))-Nm, and Nm is a value obtained from execution of a kick until the servo becomes stable and data can be read. In this embodiment, the expected number of sectors (margin until reading is possible) is determined. In this embodiment, the time (sector number) from when the kick is actually performed until the data can be read is determined.
By determining the value of Nm based on the determination result, the value of Nm is set to an appropriate value according to the variation in servo performance.

FIG. 8 shows a flow of a method for determining an appropriate value of Nm. That is, at the time of reading the disk, (bl)
When a one-track kick occurs (b3), the timer is reset and time measurement is started (b4). At the same time, a kick of one track is executed (b5). Thereafter, the DVD signal processing circuit 5 monitors the status of the DVD sync (synchronization signal) and header data (ID data) (b6).
Since the servo is stabilized and the data can be read out when the sync is correctly detected and the continuity of the header data is confirmed, when these are OK (b
7), determine the timer value and convert this value to the number of sectors.
This converted value is adopted as the value of Nm in the above equation for calculating Nk. In this embodiment, the margin is determined in the normal kick operation. However, the determination may be made at the time of kicking when the uncorrectable error sector is read, and may be incorporated into the position calculation at the next kick.

As described above, even when an uncorrectable error sector occurs during reproduction from the optical disc to a plurality of sectors in a range less than one round of the track, the track jump is performed at this point. By skipping the error sector and pre-reading the data following the next sector without performing reproduction of the error sector by performing the above operation, and then performing a track jump when approaching the first error sector, the first error can be obtained. Since the reproduction of the sector is performed and then the reproduction of another error sector is performed, the reproduction of the desired sector can be completed when the reproduction of the error sector is completed, and the reproduction time can be reduced.

Thus, when reproducing from the optical disk to a plurality of sectors in a range less than one track round, even if a plurality of error sectors occur on the way, the track jump is performed many times. It is possible to prevent the reproduction time from being significantly increased.

[0061]

As described above in detail, according to the present invention, when reproducing from the optical disc to a plurality of sectors in a range less than one round of the track, an uncorrectable error sector occurs in the middle. Even if there is, an object of the present invention is to provide an optical disk device capable of preventing a long reproduction time.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an optical disk device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a configuration of an ECC block of the optical disc shown in FIG. 1;

FIG. 3 is an exemplary view for explaining a configuration of an ECC block of the optical disc shown in FIG. 1;

FIG. 4 is a diagram showing a read position on an optical disc, read contents, a correspondence of a correction operation, and a data storage state on a correction and buffer RAM.

FIG. 5 is a diagram showing a processing flow of a reread operation in the first embodiment.

FIG. 6 is a diagram showing a comparison result between a reproduction processing time according to the first embodiment and a conventional reproduction processing time.

FIG. 7 is a block diagram schematically showing an optical disk device according to a second embodiment of the present invention.

FIG. 8 shows a flow of a method of determining an appropriate value of the number of sectors (margin until reading is possible) Nm in anticipation from the execution of a kick until the servo becomes stable and data can be read. FIG.

FIG. 9 is a diagram showing a read position on an optical disk, a read content, a correspondence of a correction operation, and a storage status of data on a correction / buffer RAM.

FIG. 10 is a diagram showing a processing flow of a conventional reread operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 5 ... DVD signal processing circuit 10 ... Correction and buffer RAM 14 ... System controller 15 ... Re-read position determination part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/18 572 G11B 20/18 572F // G11B 7/00 7/00 H

Claims (6)

[Claims] 1. A recording apparatus comprising: a concentric or spiral track on which data is recorded, a predetermined track length, and an address area in which address data indicating a position on the track is recorded; and recording data. A format in which a plurality of continuous sector areas including a recording area are defined is defined, and a format is formed of a set of a predetermined number of sector areas of the plurality of sector areas, and the recording is performed in these predetermined number of sector areas. Error correction data for reproducing data is recorded on an optical disc on which recording is performed in block area units including an error correction data recording area in which a predetermined number of sector areas are collectively recorded. An optical disk device for reproducing data stored in the optical disk; a reproducing unit for reproducing data recorded on the optical disk; When the reproducing means reproduces data from a plurality of sectors in a range less than one round of the track, when reproducing the recording data of a predetermined sector, the address data and the recording data of all the sectors in the block area including the sector are reproduced. Correcting means for reproducing the error-corrected data to correct the error; determining means for determining an error sector which cannot be corrected by the correcting means or in which the address data corrected by the correcting means is erroneous; When the determination is made, first processing means for skipping the error sector and performing reproduction by the reproduction means and correction by the correction means on and after the next sector on the same track, and processing of the first processing means After the end, when the reproduction position by the reproducing means is closer to the error sector position, By returning the reproduction position to the previous track by a track jump, a second processing means for reproducing the sector determined to be an error sector by the determination means by the reproduction means and correcting the sector by the correction means. An optical disk device, comprising: 2. The data from the optical disk is 8-16.
2. The optical disk device according to claim 1, wherein the optical disk device demodulates based on a modulation method and outputs the demodulated data as a reproduction result. 3. An address area having concentric or spiral tracks on which data is recorded, having a predetermined track length, and an address area in which address data indicating a position on the track is recorded, and recording data are recorded. A format in which a plurality of continuous sector areas including a recording area are defined is defined, and a format is formed of a set of a predetermined number of sector areas of the plurality of sector areas, and the recording is performed in these predetermined number of sector areas. Error correction data for reproducing data is recorded on an optical disc on which recording is performed in block area units including an error correction data recording area in which a predetermined number of sector areas are collectively recorded. An optical disk device for reproducing data stored in the optical disk; a reproducing unit for reproducing data recorded on the optical disk; When the reproducing means reproduces data from a plurality of sectors in a range less than one round of the track, when reproducing the recording data of a predetermined sector, the address data and the recording data of all the sectors in the block area including the sector are reproduced. Correcting means for reproducing the error-corrected data to correct the error; determining means for determining a plurality of error sectors which cannot be corrected by the correcting means or in which the address data corrected by the correcting means are erroneous; and Each time an error sector is determined, the error sector is skipped, the next sector on the same track and subsequent sectors are reproduced by the reproducing unit and corrected by the correcting unit. After the end of the processing, the reproduction position by the reproduction means is set to be before the first error sector position. At the time of Tsu, the playback position by the track jump 1
By returning to the previous track, a second processing means for sequentially performing reproduction by the reproduction means and correction by the correction means for a plurality of sectors determined to be error sectors by the determination means. Characteristic optical disk device. 4. An address area having a concentric or spiral track on which data is recorded, having a predetermined track length and recording address data indicating a position on the track, and recording data are recorded. A format in which a plurality of continuous sector areas including a recording area are defined is defined, and a format is formed of a set of a predetermined number of sector areas of the plurality of sector areas, and the recording is performed in these predetermined number of sector areas. Error correction data for reproducing data is recorded on an optical disc on which recording is performed in block area units including an error correction data recording area in which a predetermined number of sector areas are collectively recorded. An optical disk device for reproducing data stored in the optical disk; a reproducing unit for reproducing data recorded on the optical disk; When the reproducing means reproduces data from a plurality of sectors in a range less than one round of the track, when reproducing the recording data of a predetermined sector, the address data and the recording data of all the sectors in the block area including the sector are reproduced. Correction means for reproducing the error correction data to correct the error; storage means for sequentially storing the address data and the recording data in sector units corrected by the correction means; Determining means for determining an error sector in which the address data corrected by the error is incorrect; and determining the error sector by the determining means. A first process in which correction by the correction means and storage by the storage means are performed. Means for returning the reproduction position to the previous track by a track jump when the reproduction position by the reproduction means comes before the error sector position after the end of the processing by the first processing means. Second processing means for performing reproduction by the reproduction means for the sector determined to be an error sector by the determination means, correction by the correction means, and storage by the storage means; after processing by the second processing means, An output unit that outputs, as a reproduction result, recorded data of a predetermined sector stored in the storage unit. 5. The method according to claim 1, wherein the data from the optical disk is 8-16.
5. The optical disk device according to claim 4, wherein the optical disk device demodulates based on a modulation method and outputs the demodulated data as a reproduction result. 6. An address area having a concentric or spiral track on which data is recorded, having a predetermined track length and recording address data indicating a position on the track, and recording data are recorded. A format in which a plurality of continuous sector areas including a recording area are defined is defined, and a format is formed of a set of a predetermined number of sector areas of the plurality of sector areas, and the recording is performed in these predetermined number of sector areas. Error correction data for reproducing data is recorded on an optical disc on which recording is performed in block area units including an error correction data recording area in which a predetermined number of sector areas are collectively recorded. An optical disk device for reproducing data stored in the optical disk; a reproducing unit for reproducing data recorded on the optical disk; When the reproducing means reproduces data from a plurality of sectors in a range less than one round of the track, when reproducing the recording data of a predetermined sector, the address data and the recording data of all the sectors in the block area including the sector are reproduced. Correction means for reproducing the error correction data to correct the error; storage means for sequentially storing the address data and the recording data in sector units corrected by the correction means; A determination means for determining a plurality of error sectors in which the address data corrected by the above is incorrect; and each time an error sector is determined by the determination means, the error sector is skipped and the reproduction means for the next sector on the same track and thereafter. Reproduction, correction by the correction means, and storage by the storage means are performed. And first processing means after the processing by the first processing means, when the reproducing position by said reproducing means becomes short of the first error sector position, the playback position by the track jump 1
By returning to the previous track, second processing means for sequentially performing reproduction by the reproduction means, correction by the correction means, and storage by the storage means for a plurality of sectors determined to be error sectors by the determination means, And an output means for outputting, as a reproduction result, recorded data of a predetermined sector stored in the storage means after the processing by the second processing means.