JP2002305455A - Error correction information converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an error correction information converter, in which quantitative evaluation of a disc or a reproducer can be performed more objectively and accurately, based on error correction information. SOLUTION: According to the error correction information converter 2, first error correction information, including information concerning to the number of error correction bytes and the number of uncorrectable lines inputted from an input section 3, is converted at a processing section 4 into second error correction information of quantitative value and outputted from an output section 6. Quantitative evaluation of a disc or a reproducer can thereby be performed more objectively and precisely, based on error correction information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an error correction information conversion device used for measuring the number of error correction bytes in an optical disk such as a DVD (digital video disk).

[0002]

2. Description of the Related Art For example, in a DVD, data is recorded in data block units called ECC blocks in order to perform error correction. This ECC block is composed of a data block of 182 bytes (one row) × 208 rows, and each row has 10 bytes of PI (inner code parity) data as an error correction code and each column has 16 bytes of PO (outer code). Code parity
Contains data. During playback, these P
Error correction is performed for each data block of the ECC block using I and PO.

In the field of manufacturing optical discs such as DVDs and reproducing apparatuses, etc., in order to quantitatively evaluate whether or not data recorded on the disc can be accurately reproduced, error correction information during reproduction is required. Is extracted, and the evaluation is performed based on the extracted information.

[0004]

SUMMARY OF THE INVENTION However, DVD
-Information output from the ROM drive is PI and PO
However, since the information is related to the number of error-corrected bytes and the number of uncorrectable rows, the problem is that it is not sufficient for quantitative evaluation.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an error correction method capable of more objectively and accurately performing a quantitative evaluation of a disk, a reproducing apparatus, and the like based on error correction information. An object is to provide an information conversion device.

[0006]

In order to achieve the above object, an error correction information conversion apparatus according to the main aspect of the present invention is a unit for performing error correction. An apparatus for converting first error correction information for a data block, the first error correction information including information on the number of error-corrected bytes and the number of uncorrectable rows into second error-correction information, Input means for inputting error correction information, means for determining whether there is an error-correctable line in the data block based on the number of error-correctable lines included in the input first error correction information, If it is determined that there is no error-correctable row in the data block, the number of error-correction bytes, which is information included in the first error-correction information, is divided by a first parameter to be converted into an integer. A first calculating unit that, when it is determined that there is an error-correctable row in the data block, sets the number of error-correction bytes, which is information included in the first error-correction information, larger than the first parameter; Second arithmetic means for dividing by a second parameter, which is a value, into an integer, and adding the number of uncorrectable rows to the integer value, and an arithmetic result obtained by the first arithmetic means or the second arithmetic means And output means for outputting the second error correction information as the second error correction information.

According to the present invention, the first error correction information including the information on the number of error-corrected bytes and the number of uncorrectable rows is converted into quantitative second error-correction information and output. It is possible to more objectively and accurately perform a quantitative evaluation of a disc, a playback device, and the like based on the error correction information.

[0008] Preferably, the first parameter is an average value of the number of error bytes per line of an error-occurring row constituting the data block, and the second parameter is an average value of the number of error bytes. What is necessary is just to make it the average value of the number of error-correctable limit bytes per row of the row in which an error has occurred. This makes it possible to evaluate the number of error occurrence rows per data block.

Further, the error correction information conversion device of the present invention
The apparatus may further include means for integrating the second error correction information for the plurality of continuous data blocks, and means for determining whether or not the integration result exceeds a predetermined value.

[0010]

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

FIG. 1 is a diagram showing an example of a system configuration according to an embodiment of the present invention.

The DVD-ROM drive 1 is a DVD-R drive.
The OM is reproduced and error correction information is extracted and output. Here, the ECC block of the DVD-ROM is shown in FIG.
As shown in FIG. 8, the data block is composed of 182 bytes (one row) × 208 rows of data blocks, and each row has 10 bytes of PI data and each column has 16 bytes of PO data as an error correction code.
Contains data. For example, the DVD-ROM drive 1 reproduces data composed of such an ECC block, and uses, as first error correction information at that time, an ECC address, a number of PI error correction bytes (Number of PI error correction bytes).
n bytes) Number of PI Fail rows Number of PO Error correctio
n bytes) Number of PO Fail rows is output for each ECC block.

The error correction information conversion device 2 is a DVD-RO
An input unit 3, which is, for example, RS232C, for inputting the first error correction information output from the M drive 1, a processing unit 4 for performing predetermined arithmetic processing, a parameter storage unit 5 for storing parameters required for the arithmetic processing, and An output unit 6 that outputs a calculation result, such as a display unit or a printing unit, is provided.

Next, the operation of the processing section 4 will be described with reference to the flowchart shown in FIG.

First, the first determination section 41 determines whether or not there is an error-correctable row in the ECC block based on the number of PI error-correctable rows included in the first error correction information input from the input section 3. Is determined (step 301). Specifically, when the number of PI error uncorrectable rows is 0, the E
It is determined that there is no error-correctable row in the CC block, otherwise it is determined that there is an error-correctable row in the ECC block.

Next, in the first arithmetic processing section 42, when the first judgment section 41 judges that there is no error-correctable row in the ECC block, the first judgment section 41 uses the information contained in the first error correction information. A certain PI error correction byte number is divided by the first parameter stored in the parameter storage unit 5 to make an integer (step 302). The first parameter is 1 of the row where the error has occurred, which constitutes the ECC block.
The average value of the number of error bytes per line is preferably, for example, about 2.5. The specific arithmetic expression is
For example,

PI Error = CEILING ((Number of PI Error c
orrection bytes) /2.5) However, the function CEILING means a function that rounds up the decimal point.

In the second arithmetic processing section 43, when the first judgment section 41 judges that there is an error-correctable row in the ECC block, the PI error, which is information included in the first error correction information, is obtained. The number of corrected bytes is divided by the second parameter stored in the parameter storage unit 5 into an integer, and the integer value is P, which is information included in the first error correction information.
The number of I error uncorrectable rows is added (step 303). The second parameter is larger than the value of the first parameter, and is preferably an average value of the error-correctable limit number of bytes per row constituting the ECC block, for example, 5, for example. In other words, an ECC block included in an uncorrectable row is regarded as having a large number of error-prone bytes even if the row was error-correctable. Because you can think. Therefore, the following is an example of a specific expression.

PI Error = CEILING ((Number of PI Error c
orrection bytes) / 5) + Number of PI Fail rows However, the function CEILING means a function that rounds up the decimal point.

The integration processing unit 44 integrates the calculation results (PI Error) of the first and second calculation processing units 42 and 43 for, for example, eight consecutive ECC blocks (step 304).

The second judging section 45 judges whether or not the above-mentioned integration result exceeds a predetermined value, for example, 280 (step 305). If it does not exceed 280, it is determined to be OK (step 306), and if it does, it is determined to be NG (step 307).

The output unit 6 outputs the result PI Error of the first operation processing unit 42 and the operation result PI Error of the second operation processing unit 43. Is displayed or printed as the second error correction information.

As described above, according to the error correction information conversion device 2 of the present embodiment, the processing unit converts the first error correction information including the information on the number of error correction bytes and the number of uncorrectable lines input from the input unit 3 into the processing unit. The second, which is a quantitative value by 4
Since the error correction information is converted into the error correction information and output by the output unit 6, it is possible to more objectively and accurately perform a quantitative evaluation of a disc, a reproducing apparatus, and the like based on the error correction information.

Note that the present invention is not limited to the above embodiment.

For example, the first and second parameters in the above-described embodiment may have different values.

As an optical disk, not only a DVD-ROM but also other media such as a DVD-RAM and a DVD
The present invention can be applied to -RW and the like.

Further, the same can be performed for the error correction information relating to the PO.

[0028]

As described above, according to the present invention,
It is possible to more objectively and accurately perform a quantitative evaluation of a disc, a playback device, and the like based on the error correction information.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an ECC block.

FIG. 3 is a flowchart showing an operation of the error correction information conversion device in this embodiment.

[Explanation of symbols]

 2 error correction information converter 3 input unit 4 processing unit 5 parameter storage unit 6 output unit 41 first determination unit 42 first calculation processing unit 43 second calculation processing unit 44 integration processing unit 45 second determination unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 570 G11B 20/18 570Z 572 572C 572F 574 574E 576 576B H03M 13/11 H03M 13/11 H04L 1 / 00 H04L 1/00 BF term (reference) 5B001 AA06 5J065 AC03 AD03 AF02 AH02 AH03 AH12 AH15 5K014 AA01 BA01 BA05 EA01

Claims (4)

[Claims] 1. A unit for performing error correction, which is first error correction information for a data block of a plurality of rows in which one row is composed of a plurality of bytes, and is information relating to the number of error-corrected bytes and the number of uncorrectable rows. An apparatus for converting first error correction information into second error correction information, comprising: input means for inputting the first error correction information; and error correction included in the input first error correction information. Means for determining whether there is an uncorrectable line in the data block based on the number of uncorrectable lines; and, if it is determined that there is no uncorrectable line in the data block, the first error correction information includes First arithmetic means for dividing the number of error correction bytes, which is information included, by a first parameter to obtain an integer; and when it is determined that the data block has an uncorrectable row, The number of error correction bytes, which is information included in the first error correction information, is divided by a second parameter having a value larger than the first parameter to obtain an integer. Error correction information, comprising: a second calculation means for adding; and an output means for outputting a calculation result by the first calculation means or the second calculation means as the second error correction information. Conversion device. 2. The error correction information conversion device according to claim 1, wherein the first parameter is an average value of the number of error-producing bytes per row of an error-producing row constituting the data block. An error correction information conversion device, characterized in that: 3. The error correction information conversion device according to claim 1, wherein the second parameter is an error-correctable limit per row of an error-occurring row constituting the data block. An error correction information conversion device characterized by being an average value of the number of bytes. 4. One of claims 1 to 3
In the error correction information conversion device according to the paragraph, means for integrating the second error correction information for a plurality of continuous data blocks, and means for determining whether the integration result exceeds a predetermined value An error correction information conversion device, further comprising: