JPH10188494A - Optical disk reproducing method, and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk reproducing method and an optical disk device that promptly outputs error-corrected exact information. SOLUTION: The device is provided with a signal detecting section 2, which reproduces record information from a DVD 1, a lateral error correcting section 3, which corrects errors based on the lateral error correcting code of a reproducing signal, and a sector ID information storage section 4, which temporarily stores the sector ID information for specifying the lateral error correcting data. The signal correcting section 2 reproduces one line of lateral record information; the lateral correcting section 3 corrects error for one lateral line to acquire the section ID information; and the sector ID information storage section 4 stores section ID information to reproduce the record information of the DVD 1 based on the sector ID information. The correct address information is promptly acquired to reproduce.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical disk reproducing method and an optical disk apparatus for reproducing information from a high-density optical disk, particularly a recording medium such as a DVD.

[0002]

2. Description of the Related Art Optical disks have been actively applied to various fields such as CD-ROMs and developed for higher performance. Recently, DVDs, which are higher density optical disks, have begun to spread.

[0003] Regarding the recording format of this DVD, it is recorded in the following format. Figure 4 shows the DV
FIG. 3 is a block diagram of an ECC in D. In FIG. 4, the sector structure of the DVD is PIONEER R & D V
ol. 6 No. According to No. 2, sector ID information including address information of each sector is recorded at the head of each sector, and error correction is performed with 16 sectors as one ECC block.

FIG. 5 is a block diagram of a conventional medium reading apparatus represented by a DVD-ROM drive. The configuration will be described below with reference to FIG. Reference numeral 13 denotes a DVD as a recording medium. 14 is a signal detection unit,
The recorded data on the DVD 13 is reproduced. Also, a mechanism for moving the DVD 13 in the radial direction to reproduce the entire area of the DVD is included. Reference numeral 15 denotes a vertical / horizontal error correction unit, which performs error correction for one ECC block of the signal reproduced by the signal detection unit 14. Reference numeral 16 denotes a CPU which controls the operation of the entire apparatus. An interface unit 17 receives a data read request (including a request address) from a host computer (not shown) and transfers the data corrected by the vertical and horizontal error correction unit 15 to the host computer.

[0005] The correction operation of the vertical and horizontal error correction unit 15 in the conventional medium reading apparatus configured as described above will be described in further detail. FIG. 6 is a flowchart of a conventional error correction operation. A conventional error correction operation will be described with reference to FIG.

First, a data read request (command code,
Request address information and a request data length), and calculates sector ID information of the requested ECC block from the request address information included in the data read request (S1).

Next, the sector ID information of the correction result of the vertical and horizontal error correction unit 16 is obtained (S2), and the required E is obtained.
The sector ID information of the CC block is compared with the sector ID information of the correction result (S3).

In step 3, if they do not match, the amount of movement of the signal detection unit 14 is calculated from the difference between the required sector ID information of the ECC block and the corrected sector ID information, and the movement of the signal detection unit 14 is calculated. (S4). When the signal detector 14 reproduces the signal at the position after the movement, the operation after step 2 is repeated.

On the other hand, if they match in step 3, the corrected data is sent to the interface unit 17, and the data is transferred to the host computer (S5).

[0010] In this manner, the error-corrected correct information is supplied to the host computer.

[0011]

However, in order for the signal detecting section 14 to obtain accurate sector ID information of the sector from which data is read from the DVD 13, first, after obtaining data of one entire ECC block, Error correction is performed in units of 1 ECC block, and the correct sector ID is selected from the ECC block units after error correction.
We needed a procedure to get the information. That is, 1
23. Time required to read ECC block (entire)
47.2 msec, which is the sum of 6 msec and 23.6 msec required for error correction of one ECC block (error correction for the entire ECC), is required.

In order to shorten this time, as another method, it is considered to use address information that does not perform any error correction. However, there is no guarantee that address information containing no error can be obtained. I could not predict how long it would take to get the information.

[0013] Therefore, it has been required that correct information having been subjected to error correction be promptly supplied to the host computer.

It is an object of the present invention to provide an optical disk reproducing method and an optical disk apparatus which can quickly output correct information with error correction.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a signal detecting step for reproducing recorded information from an optical disk and an error correction based on an error correction code in a line (lateral) direction of the reproduced signal. A horizontal error correction step to be performed, and a sector ID information storage step for temporarily storing sector ID information for specifying the horizontal error correction data. The recorded information is reproduced, one row of error correction is performed in a horizontal error correction step to obtain sector ID information, the sector ID information is stored in a sector ID information storage step, and the entire ECC block is reproduced. It is possible to reproduce the record information of the optical disk based on the sector ID information without waiting for the completion of the error correction in the row (vertical) direction. The one in which the features.

According to the above optical disk reproducing method, it is possible to obtain accurate address information in a shorter time and reproduce the optical disk.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claims 1 and 2 of the present invention is based on a signal detecting step of reproducing recorded information from an optical disk and an error correction code of a reproduced signal in a line (lateral) direction. It has a horizontal error correction step for performing error correction, and a sector ID information storage step for temporarily storing sector ID information for specifying horizontal error correction data. The record information for one row is reproduced, error correction for one row is performed in a horizontal error correction step to obtain sector ID information, sector ID information is stored in a sector ID information storage step, and the entire ECC block is stored. Reproduce and reproduce the record information of the optical disk based on the sector ID information without waiting for the completion of the error correction in the row (vertical) direction. And it is characterized in and.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment) FIG. 1 is a block diagram of a medium reading apparatus according to an embodiment of the present invention. In FIG. 1, 1
Is a DVD as a recording medium. Reference numeral 2 denotes a signal detection unit that reproduces recorded data of the DVD 1. DVD
1 includes a mechanism for moving the DVD 1 in the radial direction to reproduce the entire area. An interface unit 6 receives a data read request (including a request address) from a host computer (not shown) and transfers the corrected data to the host computer. Each of the above components has the same function as the conventional component.

Reference numeral 3 denotes a horizontal error correction unit, which demodulates the recording data of the DVD 1 from the detection signal of the signal detection unit 2,
It performs horizontal error correction and outputs horizontal error correction data.

Reference numeral 4 denotes a sector ID information storage unit for acquiring and storing sector ID information from the horizontal error correction data. Reference numeral 5 denotes a CPU, which has a judgment control described later in its internal program.

Reference numeral 7 denotes a vertical error correction unit which stores horizontal error correction data for one block, performs vertical error correction, and outputs vertical and horizontal correction data as a correction result to the interface unit 6.

Next, the horizontal error correction section 3 will be described in more detail. FIG. 2 is a detailed configuration diagram of the horizontal error correction unit 3 of FIG. 2, 8 is a signal demodulation unit, 9 is an error correction unit, 10 is a descrambling unit, and 11
Denotes a sector ID information take-out unit, and 12 denotes a memory unit.

The signal demodulation unit 8 demodulates the output signal from the signal detection unit 2 in FIG. 1 and detects the synchronization signal for one row in the horizontal direction of the sector of the ECC block as shown in FIG. Outputs a detection signal.

The error correction section 9 receives the synchronization signal detection signal and stores one row of data in the horizontal direction in the memory section 12. When data for one row in the horizontal direction is completed, horizontal error correction is performed and horizontal correction data is output.

The descrambling unit 10 descrambles data and outputs descrambling data. The descrambling data is sent to the interface unit 6. When the synchronization signal detection signal is obtained, the sector ID information extracting section 11 extracts the sector ID information of the horizontal correction data. The sector ID information is sent to and stored in the sector ID information storage unit 4.

The processing procedure of the embodiment of the present invention configured as described above will be described. FIG. 3 is a flowchart of a processing procedure according to an embodiment of the present invention. FIG.
First, a data read request (composed of a command code, request address information, and a request data length) of the host computer is received from the interface unit 6 and the requested ECC block is obtained from the request address information included in the data read request. Is calculated (S11).

Next, sector ID information is obtained from the sector ID information storage unit 4 (S12), and it is determined whether the sector ID information matches the sector ID information of the required ECC block (S13).

In step 3, if they do not match, the sector ID information of the required ECC block and the sector I
The movement amount of the signal detection unit 2 is calculated from the difference from the D information, and the signal detection unit 2 is moved (S14). Signal detector 14
When the signal is reproduced at the position after the movement, the operation after step 2 is repeated.

On the other hand, if they match in step 3, the corrected data is sent to the interface unit 6, and the data is transferred to the host computer (S15).

In this way, the error-corrected correct information is supplied to the host computer without waiting for the error correction of the entire ECC block.

[0031]

As described above, according to the present invention, the DVD 1
Is read from the signal detection unit 2,
The time until data for one row in the horizontal direction is accumulated is shown in FIG.
As apparent from FIG. 2, 23.6 msec / 208 = 0.1
This is 1 msec, which is significantly reduced from the conventional 23.6 msec.

Also, it takes 0.11 msec before the horizontal error correction is completed. As a result, the sector ID information can be obtained in a total time of 0.22 msec, which is compared with the conventional 47.2 msec. Thus, it is possible to provide an excellent optical disk reproducing method and an optical disk apparatus capable of detecting sector ID information more quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram of a medium reading apparatus according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of a horizontal error correction unit in FIG. 1;

FIG. 3 is a flowchart of a processing procedure according to an embodiment of the present invention;

FIG. 4 is a block diagram of an ECC in a DVD.

FIG. 5 is a configuration diagram of a conventional medium reading device.

FIG. 6 is a flowchart of an error correction operation of a conventional example.

[Explanation of symbols]

 1, 13 DVD 2, 14 signal detection unit 3 horizontal error correction unit 4 sector ID information storage unit 5, 16 CPU unit 6, 17 interface unit 7 vertical error correction unit 8 signal demodulation unit 9 error correction unit 10 descramble unit 11 Sector ID information extraction unit 12 Memory unit 15 Vertical and horizontal error correction unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/18 574 G11B 20/18 574H 27/28 27/28 A A

Claims (2)

[Claims] 1. A method for reproducing an optical disk having a data recording format having an error correction code in a line (horizontal) direction and an error correction code in a row (vertical) direction, comprising: a signal detecting step of reproducing recorded information from the optical disk; A horizontal error correction step for performing error correction based on a line (horizontal) error correction code of a reproduction signal; and a sector ID for specifying horizontal error correction data.
And a sector ID information storing step of temporarily storing information. The signal detecting step reproduces one line of recording information in a line (horizontal) direction, and the horizontal error correcting step corrects one line of error. And obtaining the sector ID information, storing the sector ID information in the sector ID information storing step, and reproducing the recorded information of the optical disk based on the sector ID information. 2. An optical disk device for reproducing an optical disk having a data recording format having an error correction code in a line (horizontal) direction and an error correction code in a row (vertical) direction, wherein a signal for reproducing recorded information from the optical disk. Detecting means; horizontal error correcting means for performing error correction based on a line (horizontal) error correction code of a reproduction signal; and a sector ID for specifying horizontal error correction data.
A sector ID information storage unit for temporarily storing information, wherein the signal detection unit reproduces one line of recording information in the line (horizontal) direction, and the horizontal error correction unit corrects one line of error. To obtain the sector ID information,
The sector ID information storage means stores the sector ID
An optical disc apparatus, wherein information is stored, and recorded information on an optical disc is reproduced based on the sector ID information.