JP2003007008A - Reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device of high reproduction processing performance. SOLUTION: A data conversion part 120 provided in an optical disk unit 100 is provided with a demodulation part 121, a memory 122, an error correction part 123, an error detection part 124, a data output part 125 and a control part 126. A defect information list 122a provided for the memory 122 stores a page including defective data and the state of the page. The control part 126 controls starting of the demodulation part 121, the error correction part 123, the error detection part 124 and the data output part 125. A drop recording position confirming part 126a provided for the control part 126 outputs whether a presently reproduced page is drop-recorded or not by referring to the defect information list 122a. A correcting direction switching part 126b switches an error correcting direction for instructing the error correction part 123 by referring to the result of the drop recording position confirming part 126a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus, and more particularly to improving the data reproducing processing capacity.

[0002]

2. Description of the Related Art FIG. 12 is a diagram showing a configuration of a conventional optical disk device. As shown in FIG. 12, a conventional optical disk device 1200 includes a mechanical operation unit (hereinafter referred to as a mechanical unit) 1210, a data conversion unit 1220, and a host computer 1230.

The mechanical section 1210 irradiates the spindle motor 1211 for rotating the optical disc D and the laser beam to the optical disc D and detects the reflected light to detect the digital data (recorded on the surface of the optical disc D). An optical pickup 1212 that reads (hereinafter abbreviated as data) as an optical signal, control of the spindle motor 1211 and the optical pickup 1212, and an output unit 1213 that converts the read optical signal into an electric signal and outputs the electric signal. Prepare

The data conversion section 1220 has a demodulation section 1221.
A memory 1222, an error correction unit 1223, an error detection unit 1224, a data output unit 1225, and a control unit 12.
And 26.

Upon receiving the electric signal from the output unit 1213 of the mechanical unit 1210, the demodulation unit 1221 demodulates the electric signal into data and transfers the data to the memory 1222.

The memory 1222 stores data.

The error correction unit 1223 corrects an error in the data stored in the memory 1222 under the control of the control unit 1226.

The error detection unit 1224 checks whether or not any error remains in the data corrected by the error correction unit 1223 under the control of the control unit 1226.

The data output unit 1225 is the error detection unit 12
When no error is detected by 24, the control unit 122
The data stored in the memory 1222 is output under the control of 6.

The control unit 1226 controls the demodulation unit 1221, the error correction unit 1223, the error detection unit 1224 and the data output unit 1225.

The host computer 1230 receives the data output from the data output unit 1225.

The operation of the conventional optical disk device 1200 configured as described above will be described with reference to FIGS. 13, 14 and 15. 13 and 15 are timing charts showing data processed by each unit of the data conversion unit 1220 of the conventional optical disc device 1200.

FIG. 14A shows an optical disk device 1200.
FIG. 16 is a diagram showing data including an error, which is read by the optical disc device 1200 when performing the operation shown in FIGS. 13 and 15. FIG. 14B is a diagram showing a data structure when error correction is performed in the error correction unit 1223. As shown in FIG. 14A, the data conversion unit 120
The data received by is divided into fixed units (pages), and one page is divided into fixed units (sectors). Especially, the data shown in FIG.
There is a burst error from sector 3 to sector 5 of the page.

First, referring to FIG. 13, focusing on the data of the first page that does not include an error, the data conversion unit 12
The operation of 20 will be described.

As shown in FIG. 13, the mechanical unit 1210 is
When the data of the page is output, the demodulation unit 1221 outputs 1
The data of the page is demodulated, and this data is stored in the memory 122.
Transfer to 2. At this time, the memory 1222 stores the data of the first page.

Next, the control unit 1226 controls the demodulation unit 1221.
In response to the completion of the demodulation processing of the data of the first page, the error correction unit 1223 is activated. Error correction unit 122
3 performs error correction on the data of the first page stored in the memory 1222.

Next, the control unit 1226 controls the error correction unit 12
Upon completion of the processing of step 23, the result of error correction is confirmed. When the control unit 1226 confirms that there is no error (the data on the first page does not include an error),
The error detector 1224 is activated. Error detector 1224
Detects an error in the data of the first page.

Next, the control unit 1226 controls the error detection unit 12
Upon completion of the processing of 24, the result of error detection is confirmed. When it is confirmed that no error is detected, the data output unit 1225 is activated.

Next, the data output section 1225 outputs the data of the first page.

Next, focusing on the data on the second page and the data on the third page, which contain a burst error, the operation of the data conversion section 1220 will be described.

(Operation 1) As shown in FIG.
When the 210 outputs the data of the second page, the demodulation unit 12
21 demodulates the data of the second page and transfers this data to the memory 1222. At this time, the memory 1222
Saves the data for the second page.

Next, the demodulation unit 1221 completes the demodulation of the data of the second page and shifts to the demodulation of the data of the third page. At this time, the control unit 1226 activates the error correction unit 1223 in response to the completion of the demodulation of the second page data in the demodulation unit 1221. Error correction unit 122
3 corrects an error in the data of the second page stored in the memory 1222. Specifically, the error correction unit 1223, as shown in FIG.
A block product code is created from the data stored in No. 2 and error correction is performed in the direction of referring to the same bit of each sector (hereinafter, referred to as C2 direction) with respect to the data of the second page stored in the memory 1222. To do. As shown in FIG. 14B, the direction in which error correction is performed is such that one sector is divided into several rows and the values of all codes in that row are referred to (hereinafter referred to as C1 direction). There are two directions, that is, a direction (hereinafter, referred to as C2 direction) that refers to a code in the same column in all rows of all sectors. Errors include burst errors and random errors, and it is more efficient to preferentially correct burst errors because erroneous correction can be prevented. Normal,
Error correction performed in the C1 direction is not very effective in correcting burst errors. Therefore, the error correction unit 1223 sets the first correction direction to the C2 direction. The error correction unit 1223 corrects an error in the C2 direction for the data of the second page stored in the memory 1222 (first error correction).

Next, the control unit 1226 controls the error correction unit 12
Upon completion of the processing of step 23, the result of error correction is confirmed. The control unit 1226 has an error that cannot be corrected by the correction in the C2 direction, and the size of the data area 1401 including the error that cannot be corrected is the amount (2
If the entire page is confirmed, the error correction unit 1223 is activated again without giving the erasure information.

The error correction unit 1223 performs error correction on the data of the second page stored in the memory 1222 in the C1 direction (second error correction). During this period, the demodulation unit 1
221 completes the demodulation of the third page and moves to the demodulation of the fourth page. Further, the control unit 1226 confirms that the processing of the demodulation unit 1221 is completed, but the error correction unit 1223
Is in operation, so it waits for the completion of this operation.

Next, the control unit 1226 controls the error correction unit 12
Upon completion of the processing of step 23, the result of error correction is confirmed. When the control unit 1226 confirms that the number of rows with uncorrectable errors is within the erasure-correctable range in the correction in the C2 direction, the data unit 1402 including uncorrectable errors is set as the erasure position, and the error correction unit 1223 is set again. To start.

The error correction unit 1223 uses the data area 1 for the data of the second page stored in the memory 1222.
Error correction is performed in the C2 direction using 402 and 1403 as erasure positions (third error correction). The data area 1403 is a C2 parity part corresponding to the data area 1402.

Next, the control unit 1226 controls the error correction unit 12
Upon completion of the processing of step 23, the result of error correction is confirmed. When the control unit 1226 confirms that there is no uncorrectable error, the control unit 1226 activates the error detection unit 1224. In addition, since the demodulation of the data of the third page has already been completed, the error correction unit 122 is applied to the data of the third page.
Start 3.

The error detector 1224 detects an error in the data of the second page stored in the memory 1222.

The control unit 1226 confirms the error detection result in response to the completion of the processing of the error detection unit 1224. After confirming that no error is detected, the data output unit 1225 is activated.

The data output unit 1225 is connected to the memory 1222.
The data of the second page stored in is output to the host computer 1230.

(Operation 2) Here, the error detector 1224
A case in which an error is detected will be described. FIG. 15 is a timing chart showing data processed by each unit of the data conversion unit 1220 in this case.

As shown in FIG. 15, the mechanical section 1210 has two
When the data of the page is output, the demodulation unit 1221 outputs 2
The data of the page is demodulated, and this data is stored in the memory 122.
Transfer to 2. At this time, the memory 1222 stores the data of the second page.

Next, the demodulation unit 1221 completes the demodulation of the second page and shifts to the demodulation of the third page. At this time, the control unit 1226 receives the completion of the demodulation of the data of the second page in the demodulation unit 1221 and receives the error correction unit 122.
Start 3. The error correction unit 1223 uses the memory 1222.
Error correction is performed in the C2 direction on the data of the second page stored in.

Next, the control unit 1226 controls the error correction unit 12
Upon completion of the processing of step 23, the result of error correction is confirmed. When the control unit 1226 confirms that there is no error, the control unit 1226 activates the error detection unit 1224. The error detector 1224 detects an error in the data of the second page.

The error detector 1224 detects an error in the data of the second page. During this period, the demodulation unit 122
1 completes the demodulation of the third page and moves to the demodulation of the fourth page.

Next, the control unit 1226 controls the demodulation unit 1221.
In response to the completion of the processing of the data of the third page, the error correction unit 1223 for the data of the third page.
To start. The error correction unit 1223 corrects an error in the third page data stored in the memory 1222.

Next, the control unit 1226 controls the error detection unit 12
Upon completion of the processing of 24, the result of error detection is confirmed. When an error is detected, the error correction unit 122 is used to perform error correction on the second page data again.
Wait for completion of error correction for the data of the third page in 3.

The control unit 1226 confirms the error correction result in response to the completion of the processing of the error correction unit 1223. The control unit 1226 confirms the completion of the error correction, and again performs the error correction unit 122 for the second page in the standby state.
Start 3. The error correction unit 1223 corrects an error in the C1 direction for the data of the second page stored in the memory 1222.

The control unit 1226 confirms the error correction result in response to the completion of the processing of the error correction unit 1223. When the control unit 1226 confirms that there is no error, the control unit 1226 activates the error detection unit 1224.

The error detector 1224 detects an error in the data of the second page.

The control unit 1226 confirms the error detection result in response to the completion of the processing of the error detection unit 1224. When confirming that no error is detected, the control unit 1226 activates the data output unit 1225.

The data output unit 1225 outputs the data of the second page to the host computer 1230.

[0043]

In the case of a rewritable optical disk for recording a moving image, etc., in order to secure the continuity of data, a page that could not be normally recorded at the time of recording is treated as a normally recorded page ( Hereinafter, referred to as a drop record) exists. There is a defect in the data of such a page. Therefore, a large burst error often occurs. However, since correct data is often recorded partially, it is preferable to reproduce the reproduced image in order to suppress the disturbance. Also,
The continuity of data during playback is also important.

In the conventional optical disk device 1200, when a page of such drop recording is reproduced, as shown in the above operation 1, error correction is excessively performed even for data that cannot be error corrected. Therefore, there is a problem that the reproduction processing performance is deteriorated.

Further, in the conventional optical disk device 1200, in order to maintain the continuity of the output data, it is necessary to store the data in the memory 1222 during the error correction and the error check as shown in the above operation 2. Therefore, there is also a problem that a large amount of memory is required.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a recording / reproducing apparatus having high reproduction processing performance.

[0047]

The reproducing apparatus of the present invention demodulates the signal transmitted from the receiving means and the receiving means for receiving a data group consisting of continuous data for a certain period as a signal from the outside. The demodulation means, a storage unit that stores the data group transmitted from the demodulation unit, a storage unit that includes an error-containing data group storage unit that stores a data group including erroneous data, and data of the data group A two-dimensional array is used as a product code, and an error in the data of the data group is corrected in at least one of the first direction of the product code or the second direction different from the first direction. Error correction means, error detection means for detecting an error remaining in the data of the data group corrected by the error correction means, and the data group stored in the error-containing data group storage section. When it is detected that the recording is a top recording, the above-mentioned one of the first direction and the second direction is switched from the one direction to the other direction to correct the data error of the data group. A control means for controlling the error correction means and an output means for outputting the data group from the storage means to the outside are provided.

In the above configuration, when it is detected that the data group stored in the error-containing data group storage unit is drop recording, one direction from the first direction or the second direction to the other direction. Switch to. Therefore, it is not necessary to perform error correction in one of the first direction and the second direction in order to detect a data group including erroneous data, which is performed in the conventional reproducing apparatus. Therefore, the error correction time can be shortened as compared with the conventional case.

Receiving means for receiving, as a signal, a data group in which data for a certain period is continuous, demodulating means for demodulating the signal transmitted from the receiving means, and data group transmitted from the demodulating means. And a storage unit that includes an error-containing data group storage unit that stores a data group including erroneous data, and the data in the data group is two-dimensionally arranged to form a product code, and the product At least a first direction of the code or a second direction different from the first direction
Error correction means for correcting an error in the data in the data group, and error detection means for detecting an error remaining in the data of the data group corrected by the error correction means. And the signal level of the data group received from the receiving means and the data group received from the demodulating means, and outputs to the control means a no-signal data area for generating a no-signal state in the data group. The signal state detecting means and the non-signal data in the erasure correctable range received from the signal state detecting means when it is detected that the data group stored in the error containing data group storage section is drop recording. Control means for controlling the error correction means so as to perform erasure correction on the area, and output means for outputting the data group from the storage means to the outside are provided.

In the above configuration, when it is detected that the data group stored in the error-containing data group storage unit is drop recording, the erasure correction is performed on the no-signal data area within the erasure-correctable range received from the signal state detecting means. To do. Therefore, it is not necessary to perform the error correction performed for detecting a data group including erroneous data and searching for a no-signal data area for erasure correction, which is performed by a conventional reproducing apparatus.
Therefore, the error correction time can be shortened as compared with the conventional case.

Receiving means for receiving, as a signal, a data group in which data of a certain period is continuous, demodulating means for demodulating the signal transmitted from the receiving means, and data group transmitted from the demodulating means. And a storage unit that includes an error-containing data group storage unit that stores a data group including erroneous data, and the data in the data group is two-dimensionally arranged to form a product code, and the product At least a first direction of the code or a second direction different from the first direction
Error correction means for correcting an error in the data in the data group, and error detection means for detecting an error remaining in the data of the data group corrected by the error correction means. And a signal level of the data group received from the receiving means and the data group received from the demodulating means, a no-signal data area for generating a no-signal state in the data group is set in the error correcting means. When it is detected that the signal state detecting means for outputting and the data group stored in the error-containing data group storage section are drop records, the signal state detecting means receives the non-signal data area and receives the non-signal data area. The error correction means is controlled so that the error correction of the data group is performed only in one of the 1 direction and the second direction, and the error in the data group is eliminated. And a control means for controlling the error detection means to, and output means for outputting the data group to the outside from the storage means.

In the above arrangement, the control means receives the no-signal data area from the signal state detection means when it detects that the data group stored in the error-containing data group storage section is drop recording, and receives the first signalless data area. The error correction of the data group is performed only in either the direction or the second direction, and the error detection means controls so as to ignore the error in the data group. Therefore, it is possible to reduce the error correction processing of the data group which is unlikely to be error-corrected, and to shorten the error correction time as compared with the conventional case.

Receiving means for receiving, as a signal from the outside, a data group in which data of a certain period is continuous, demodulating means for demodulating the signal transmitted from the receiving means, and data group transmitted from the demodulating means. And a storage unit that includes an error-containing data group storage unit that stores a data group including erroneous data, and the data in the data group is two-dimensionally arranged to form a product code, and the product At least a first direction of the code or a second direction different from the first direction
Error correction means for correcting an error in the data in the data group, and error detection means for detecting an error remaining in the data of the data group corrected by the error correction means. And a signal level of the data group received from the receiving means and the data group received from the demodulating means, a no-signal data area for generating a no-signal state in the data group is set in the error correcting means. When it is detected that the signal state detecting means for outputting and the data group stored in the error-containing data group storage section are drop records, the signal state detecting means receives the non-signal data area, A control means for controlling the error detection means so as to ignore an error in the data group and an output means for outputting the data group from the storage means to the outside are provided.

In the above arrangement, the control means receives the no-signal data area from the signal state detection means and detects the data group when the data group stored in the error-containing data group storage section is detected to be drop recording. The error detection means is controlled so as to ignore the error existing in. Therefore, it is possible to reduce the error correction processing of the data group which is unlikely to be error-corrected, and to shorten the error correction time as compared with the conventional case.

The receiving means may receive, as a signal, a data group in which data of a certain period is continuous from the optical disc.

The first direction and the second direction of the product code may be orthogonal to each other.

[0057]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 11. Note that, for simplification, the components common to the respective embodiments are denoted by the same reference numerals.

(Embodiment 1) FIG. 1 is a diagram showing a configuration of an optical disk device of the present embodiment. As shown in FIG. 1, the optical disc device 100 according to the present embodiment includes a mechanical operation unit (hereinafter referred to as a mechanical unit) 110 and a data conversion unit 120.
And a host computer 130.

The mechanical section 110 irradiates the spindle motor 111 for rotating the optical disc D and the laser beam to the optical disc D and detects the reflected light,
The optical pickup 112 that reads data recorded on the surface of the optical disc D as an optical signal, control of the spindle motor 111 and the optical pickup 112, converts the read optical signal into an electric signal, and outputs the electric signal. And an output unit 113.

The data converter 120 includes a demodulator 121 and
Memory 122, error correction unit 123, and error detection unit 12
4, a data output unit 125, and a control unit 126.

The demodulation section 121 is the output section 1 of the mechanical section 110.
When the electric signal is received from 13, the electric signal is demodulated into data and transferred to the memory 122.

The memory 122 stores data. The memory 122 also has a defect information list 122a. The defect information list 122a stores a page having a data defect and the state of the page.

The error correction unit 123 corrects an error in the data stored in the memory 122 under the control of the control unit 126. Specifically, the error correcting unit 123 is
A block product code is created for each page of the data stored in, and the error is corrected in either the C1 direction or the C2 direction.

The error detection unit 124 checks whether or not the data corrected by the error correction unit 123 under the control of the control unit 126 has any error.

The data output unit 125 includes an error detection unit 124.
When the error is no longer detected by, the data stored in the memory 122 is output under the control of the control unit 126.

The control unit 126 includes a demodulation unit 121, an error correction unit 123, an error detection unit 124 and a data output unit 125.
To control. The control unit 126 also includes a drop recording position confirmation unit 126a and a correction direction switching unit 126b. The drop recording position confirmation unit 126a reads the defective page of the data and the state of the page from the defect information list 122a, and outputs whether or not the currently reproduced page is the drop recording. Correction direction switching unit 126b
Receives the result of the drop recording position confirmation unit 126a and instructs the error correction unit 123 to perform the error correction direction (C1,
Switch C2).

The host computer 130 receives the data output from the data output unit 125.

The operation of the optical disc apparatus 100 of the present embodiment having the above-mentioned configuration will be described with reference to FIGS. 2 and 3.

FIG. 2A is a timing chart showing data processed by each unit of the data conversion unit 120 of the optical disc apparatus 100, and FIG. 2B is a timing chart of the data conversion unit 1220 of the conventional optical disc apparatus 1200. 6 is a timing chart showing data processed by each unit.

FIG. 3A is a diagram showing a structure of data including an error, which is read by the optical disc device 100 and the conventional optical disc device 1200 when the operation shown in FIG. 2 is performed, and FIG. 8] is a diagram showing a data structure when error correction is performed in the error correction unit 123. As shown in FIG. 3A, the data received by the data conversion unit 120 is divided into fixed units (pages), and one page is divided into fixed units (sectors). In particular, in the data shown in FIG. 3A, the data on the second page is drop recording, and a burst error exists from sector 3 to sector 5.

As shown in FIG. 2A, when the mechanical section 110 outputs the data of the second page, the demodulation section 121 outputs 2 pages.
The data of the page is demodulated, and this data is stored in the memory 122.
Transfer to. At this time, the memory 122 stores the data of the second page, and the defect information list 122a stores the page having a defect in the data and the state of the page.

Next, the demodulation section 121 completes the demodulation of the data of the second page and shifts to the demodulation of the data of the third page.
At this time, since the data of the second page is drop recording including a burst error, the drop recording position confirmation unit 126
The a reads the defective page of the data and the state of the page from the defect information list 122a, and detects that the second page is the drop recording. Correction direction switching unit 126
In response to the result of the drop recording position confirmation unit 126a, b changes the correction direction of the second page to the C1 direction.

The control unit 126 activates the error correction unit 123 in response to the completion of the demodulation process of the second page data of the demodulation unit 121. In response to the result of the correction direction switching unit 126b, the error correction unit 123 creates a block product code for the data of the second page stored in the memory 122 as shown in FIG. Correction of.

Next, the control unit 126 controls the error correction unit 123.
The result of the error correction is confirmed in response to the completion of the process of. When the control unit 126 confirms that there is an uncorrectable error, the control unit 126 sets the data area 301 including the error that cannot be corrected and the C2 parity unit 302 corresponding to the data area 301 as the erasure position and activates the error correction unit 123 again. The error correction unit 123 corrects an error in the C2 direction with respect to the second page data stored in the memory 122, specifically, the erasure correction of the data area 301 and the C2 parity unit 302. During this period, the demodulation unit 121
Completes the demodulation of the third page and moves to the demodulation of the fourth page. Further, the control unit 126 confirms that the processing of the demodulation unit 121 is completed, but since the error correction unit 123 is in operation, it waits for the completion of this operation.

Next, the control unit 126 controls the error correction unit 123.
The result of the error correction is confirmed in response to the completion of the process of. When confirming that there is no uncorrectable error, the control unit 126 activates the error detection unit 124. Since the demodulation of the data of the third page has already been completed, the error correction unit 123 is activated for the data of the third page.

The error detector 124 detects an error in the data of the second page stored in the memory 122.

The control unit 126 confirms the error detection result in response to the completion of the processing of the error detection unit 124.
After confirming that no error is detected, the data output unit 12
Start 5.

The data output unit 125 uses the data of the second page stored in the memory 122 as the host computer 13
Output to 0.

In the conventional optical disk device 1200, a data area in which error correction in the C2 direction is performed as the first error correction, and error correction in the C2 direction other than erasure correction such as drop recording in which a burst error exists cannot be performed. It is detected whether or not a page including is present.

However, in the optical disc apparatus 100 of the present embodiment, when there is a data area that cannot be corrected in the C2 direction other than erasure correction, the page including this data area and the state of the page are detected in advance. There is no need to perform the first error correction in the C2 direction performed by the device 1200. Therefore, by performing the correction in the C1 direction as the first error correction, it is possible to search the data area in the page including the error to be erasure-corrected in the C2 direction. Therefore, the error correction time can be shortened by the time indicated by A in FIG. 2B (the time required for the error correction in the C2 direction) as compared with the related art, and the deterioration of the processing performance can be suppressed. Also, by shortening the error correction time, the number of pages demodulated until the data output of the page containing the error is completed can be reduced, and the size of the data holding area required on the memory can be suppressed. can do.

(Second Embodiment) FIG. 4 shows the configuration of an optical disk device 200 according to the present embodiment. Optical disc device 200
The configuration is almost the same as that of the optical disc device 100 of the first embodiment, but the configuration of the data conversion unit 220 is different from the data conversion unit 120 of the first embodiment.

Data converter 220 of optical disc 200
Includes a demodulation unit 121, a memory 122, and an error correction unit 12
3, an error detection unit 124, a data output unit 125, a control unit 226, and a reproduction signal state detection unit 240.
That is, the demodulation unit 121, the memory 122, the error correction unit 123, the error detection unit 124, and the data output unit 125 are the same as the data conversion unit 120 of the first embodiment.

The reproduction signal state detecting section 240 includes an output section 11
The level of the reproduced signal from No. 3 is monitored, and when it falls below a certain level, it is determined that there is no signal. In addition, the demodulation unit 12
In synchronization with the transfer from 1 to the memory 122, the position information in the sector obtained from the synchronization signal is received, and the data area that causes the no-signal state is output to the disappearance position setting unit 226b.

The control section 226 includes a demodulation section 121, an error correction section 123, an error detection section 124 and a data output section 125.
To control. The control unit 126 also includes a drop recording position confirmation unit 126a and a disappearance position setting unit 226b. The drop recording position confirmation unit 126a reads the defective page of the data and the state of the page from the defect information list 122a, and outputs whether or not the currently reproduced page is the drop recording. The erasure position setting unit 226b receives the result of the drop recording position confirming unit 126a, the current page is the drop recording, and the reproduction signal state detecting unit 240 can perform the erasure correction on the data area which causes the no-signal state. If it is within this range, the error correction unit 123 is instructed to use the data area detected by the reproduction signal state detection unit 240 as the erasure position. The range in which erasure correction is possible depends on the code to be used, but in the present embodiment, it is the range of the data area which is equal to the amount of parity.

The operation of the optical disk device 200 of the present embodiment having the above-described structure will be described with reference to FIGS. 5 and 6.

FIG. 5A is a timing chart showing data processed by each unit of the data conversion unit 220 of the optical disc device 200, and FIG. 5B is a timing chart of the data conversion unit 1220 of the conventional optical disc device 1200. 6 is a timing chart showing data processed by each unit.

FIG. 6A is a diagram showing a structure of data including an error, which is read when the optical disc device 200 and the conventional optical disc device 1200 perform the operation shown in FIG. 5A. (B) is a diagram showing a data structure when error correction is performed in the error correction unit 123. As shown in FIG. 6A, the data conversion unit 220
The data received by is divided into fixed units (pages), and one page is divided into fixed units (sectors). In particular, in the data shown in FIG. 6A, the data on the second page is drop recording, and a burst error exists from sector 3 to sector 5. The burst error of the data on the second page includes the data area where the no-signal state occurs.

As shown in FIG. 5A, when the mechanical section 110 outputs the data of the second page, the demodulation section 121 outputs the second page data.
The data of the page is demodulated, and this data is stored in the memory 122.
Transfer to. At this time, the memory 122 stores the data of the second page, and the defect information list 122a stores the page having a defect in the data and the state of the page. The reproduction signal state detection unit 240 monitors the level of the signal of the second page from the output unit 113, and as shown in FIG.
The signalless state is detected and the C2 parity unit 602 corresponding to the corresponding data position 601 and data area 601 is output to the erasure position setting unit 226b.

Next, the demodulation section 121 completes the demodulation of the data of the second page and shifts to the demodulation of the data of the third page.
At this time, since the data of the second page is drop recording including a burst error, the drop recording position confirmation unit 126
The a reads the defective page of the data and the state of the page from the defect information list 122a, and detects that the second page is the drop recording. Disappearance position setting unit 226b
Receives the result of the drop recording position confirmation unit 126a,
The data area 601 and the C2 parity section 60, which are detected by the reproduction signal state detection unit 240 to generate the no-signal state
2 is transferred to the error correction unit 123 as the erasure position.

Next, in response to the fact that the demodulation unit 121 has finished processing the data of the second page, the control unit 226 sets the correction direction to the C2 direction and activates the error correction unit 123. As shown in FIG. 6B, the error correction unit 123 creates a product code for the data of the second page stored in the memory 122 and makes an error in the C2 direction with the data area 601 and the C2 parity unit 602 as the erasure position. The disappearance of is corrected.

Next, the control unit 126 controls the error correction unit 123.
The result of the error correction is confirmed in response to the completion of the process of. When confirming that there is no uncorrectable error, the control unit 126 activates the error detection unit 124. Since the demodulation of the data of the third page has already been completed, the error correction unit 123 is activated for the data of the third page.

The error detector 124 detects an error in the data of the second page stored in the memory 122.

The control unit 126 confirms the error detection result in response to the completion of the processing of the error detection unit 124.
After confirming that no error is detected, the data output unit 12
Start 5.

The data output unit 125 uses the data of the second page stored in the memory 122 as the host computer 13
Output to 0.

In the optical disk device 200 of this embodiment,
If there is a data area that cannot be corrected in the C2 direction even if erasure correction is used, the page including this data area and the state of the page are detected in advance.
There is no need to perform the first error correction in the direction C2 performed at 200.

Further, the optical disk device 20 of the present embodiment.
With 0, if there is a data area that causes a no-signal state in a data area that cannot be corrected in the C2 direction other than erasure correction, the data area that causes the no-signal state is detected as the erasure position in the correction in the C2 direction. be able to.
Therefore, in the optical disc device 100 of the first embodiment,
It is not necessary to perform the first error correction in the C1 direction for searching the data area to be erased in the C2 direction, and it is sufficient to perform the correction in the C2 direction as the error correction. Therefore, the error correction time can be shortened by the time shown by B in FIG. 5B (the time required for the error correction in the C2 direction and the C1 direction) compared to the conventional case, and the deterioration of the processing performance can be suppressed. it can. Also, by shortening the error correction time, the number of pages demodulated until the data output of the page containing the error is completed can be reduced, and the size of the data holding area required on the memory can be suppressed. can do.

(Third Embodiment) FIG. 7 shows the configuration of an optical disk device 300 according to the present embodiment. Optical disc device 300
Has almost the same configuration as the optical disc device 200 of the second embodiment. However, the configuration of the data conversion unit 320 is different from that of the data conversion unit 220 of the second embodiment.

The data conversion section 32 of the optical disk device 300
0 is the demodulation unit 121, the memory 122, and the error correction unit 1
23, an error detection unit 124, a data output unit 125,
The controller 326 and the reproduction signal state detector 240 are provided. That is, the demodulation unit 121, the memory 122, the error correction unit 123, the error detection unit 124, and the data output unit 12
5 and the reproduction signal state detection unit 240 are the same as those in the second embodiment.
Is the same as that included in the data conversion unit 220.

The reproduction signal state detecting section 240 includes an output section 11
The level of the reproduced signal from 3 is monitored, and when it falls below a certain level, it is determined that there is no signal, and the result is output to the correction stop determination unit 326b.

The control section 326 includes a demodulation section 121, an error correction section 123, an error detection section 124 and a data output section 125.
To control. The control unit 126 also includes a drop recording position confirmation unit 126a and a correction cancellation determination unit 326b. The drop recording position confirmation unit 126a reads the defective page of the data and the state of the page from the defect information list 122a, and outputs whether or not the currently reproduced page is the drop recording. The correction stop determination unit 326b receives the result of the drop recording position confirmation unit 126a, and the currently reproduced page is the drop recording, and the reproduction signal state detection unit 240 loses the data area causing the no-signal state. If the range is uncorrectable, the error correction unit 705 is instructed to perform error correction only in the C1 direction. The range in which erasure correction is impossible depends on the code used, but in the present embodiment, it is the range of the data area larger than the amount of parity.

The operation of the optical disk device 300 of the present embodiment having the above-described structure will be described with reference to FIGS. 8 and 9.

FIG. 8A is a timing chart showing the data processed by each unit of the data conversion unit 320 of the optical disc device 300, and FIG. 8B is a timing chart of the data conversion unit 1220 of the conventional optical disc device 1200. 6 is a timing chart showing data processed by each unit.

FIG. 9A is a diagram showing the structure of data including an error, which is read when the optical disk device 300 and the conventional optical disk device 1200 perform the operation shown in FIG. 8A. (B) is a diagram showing a data structure when error correction is performed in the error correction unit 123. As shown in FIG. 9A, the data conversion unit 320
The data received by is divided into fixed units (pages), and one page is divided into fixed units (sectors). In particular, in the data shown in FIG. 9A, the data on the second page is drop recording, and a burst error exists from sector 3 to sector 5. The burst error of the data on the second page includes a data area that causes a no-signal state.

As shown in FIG. 8A, when the mechanical section 110 outputs the data of the second page, the demodulation section 121 outputs 2 pages.
The data of the page is demodulated, and this data is stored in the memory 122.
Transfer to. At this time, the memory 122 stores the data of the second page, and the defect information list 122a stores the page having a defect in the data and the state of the page. The reproduction signal state detection unit 240 monitors the level of the signal of the second page from the output unit 113, detects the no-signal state, and the corresponding data area 901 and the C2 parity unit 902 corresponding to the data area 901 (FIG. 9). (See (b)) is output to the correction cancellation determination unit 326b.

Next, the demodulation section 121 completes the demodulation of the data of the second page and shifts to the demodulation of the data of the third page.
At this time, since the data of the second page is drop recording including a burst error, the drop recording position confirmation unit 126
The a reads the defective page of the data and the state of the page from the defect information list 122a, and detects that the second page is the drop recording. Correction cancellation determination unit 326b
Receives the result of the drop recording position confirmation unit 126a,
When the data area 901 that causes the no-signal state in the reproduction signal state detection unit 240 has a size that cannot be erasure corrected,
The error correction unit 12 is configured to perform the correction in the C1 direction only once.
Instruct 3.

Next, control unit 326 activates error correction unit 123 in response to the fact that the demodulation unit 121 has finished processing the data of the second page. Error correction unit 123
9B, a block product code is created for the data of the second page stored in the memory 122, and the error is corrected in the C1 direction.

Next, the control unit 326 controls the error correction unit 123.
The result of the error correction is confirmed in response to the completion of the process of. The control unit 126 activates the error detection unit 124 although there is an error that cannot be corrected. Since the demodulation of the data of the third page has already been completed, the error correction unit 123 is activated for the data of the third page.

The error detector 124 detects an error in the data of the second page stored in the memory 122.

The control unit 126 confirms the result of the error detection in response to the completion of the processing of the error detection unit 124.
Although an error is detected, the data output unit 125 is activated.

The data output unit 125 uses the data of the second page stored in the memory 122 as the host computer 13
Output to 0.

In the optical disk device 300 of this embodiment,
When it is detected in advance that the data area in which the no-signal state is generated cannot be corrected in the C2 direction, the first and third C2 performed by the conventional optical disk device 1200 are performed.
Omit error correction in the direction. As a result, the time (1) shown by T1 and T2 in FIG.
The error correction time can be shortened by the time required for the second and third error corrections in the C2 direction), and the deterioration of processing performance can be suppressed. Also, by shortening the error correction time, the number of pages demodulated until the data output of the page containing the error is completed can be reduced, and the size of the data holding area required on the memory can be suppressed. can do.

(Embodiment 4) FIG. 10 shows the configuration of an optical disk device 400 of this embodiment. Optical disk device 40
0 has almost the same configuration as the optical disc device 300 of the third embodiment. However, the configuration of the data conversion unit 420 is
This is different from the data conversion unit 320 of the third embodiment.

The data conversion section 42 of the optical disk device 400
0 is the demodulation unit 121, the memory 122, and the error correction unit 1
23, an error detection unit 124, a data output unit 125,
The controller 426 and the reproduction signal state detector 240 are provided. That is, the demodulation unit 121, the memory 122, the error correction unit 123, the error detection unit 124, and the data output unit 12
5 and the reproduction signal state detecting section 240 are the same as those in the third embodiment.
Is the same as that included in the data conversion unit 320.

The control section 426 includes a demodulation section 121, an error correction section 123, an error detection section 124 and a data output section 125.
To control. The control unit 426 also includes a drop recording position confirmation unit 126a and a correction processing determination unit 426b. The drop recording position confirmation unit 126a reads the defective page of the data and the state of the page from the defect information list 122a, and outputs whether or not the currently reproduced page is the drop recording. The correction processing determination unit 426b receives the result of the drop recording position confirmation unit 126a, the currently reproduced page is the drop recording, and the reproduction signal state detection unit 240 loses the data area causing the no-signal state. If it is within the correctable range, it is treated as if no error was detected without performing error correction again. The range in which erasure correction is possible depends on the code to be used, but in the present embodiment, it is the range of the data area which is equal to the amount of parity.

The operation of the optical disk device 400 of the present embodiment having the above-described structure will be described with reference to FIGS. 11 and 9.

FIG. 11A is a timing chart showing the data processed by each unit of the data conversion unit 420 of the optical disk device 400 when the data shown in FIG. 9A is read, and FIG. 9A is a timing chart showing data processed by each unit of the data conversion unit 1220 of the conventional optical disc device 1200 when the data shown in FIG. 9A is read.

As shown in FIG. 11A, the mechanical section 110
When the second page data is output by the demodulator 121,
The data of the second page is demodulated, and this data is stored in the memory 12
Transfer to 2. At this time, the memory 122 stores the data of the second page, and the defect information list 122a stores the page having a defect in the data and the state of the page. The reproduction signal state detection unit 240 monitors the level of the signal of the second page from the output unit 113 and generates the no-signal state shown in FIG.
The C2 parity unit 902 corresponding to 01 is detected. Further, the reproduction signal state detection unit 240 outputs the data area 901 and the C2 parity unit 902 to the correction processing determination unit 426b.

Next, the demodulation section 121 completes the demodulation of the data of the second page and shifts to the demodulation of the data of the third page.
At this time, since the data of the second page is drop recording including a burst error, the drop recording position confirmation unit 126
The a reads the defective page of the data and the state of the page from the defect information list 122a, and detects that the second page is the drop recording.

Next, the control unit 326 activates the error correction unit 123 in response to the fact that the demodulation unit 121 has finished processing the data of the second page. Error correction unit 123
9B, a block product code is created for the data of the second page stored in the memory 122, and the error is corrected in the C1 or C2 direction (C2 direction in this embodiment). At this time, erroneous correction may be performed.

Next, the control unit 426 causes the error correction unit 123.
The result of the error correction is confirmed in response to the completion of the process of. The control unit 426 activates the error detection unit 124 because it performs the correction process even if the error correction unit 123 makes an error correction. Since the demodulation of the data of the third page has already been completed, the error correction unit 123 is activated for the data of the third page.

The error detector 124 detects an error in the data of the second page stored in the memory 122.

Next, the control unit 126 causes the error detection unit 124
The result of the error detection is confirmed in response to the completion of the processing of. Here, an error is detected in the data area that is erroneously corrected. The correction processing determination unit 426b receives the result of the drop recording position confirmation unit 126a and determines that the data area 901 that causes the no-signal state detected by the reproduction signal state detection unit 240 is included in the sector in which the error is detected. The data output unit 125 is activated without performing error correction processing.

The data output section 125 uses the data of the second page stored in the memory 122 as the host computer 13
Output to 0.

In the optical disk device 400 of this embodiment,
It is determined whether or not it is necessary to re-correct the data area 901 that causes the no-signal state for the data that is erroneously corrected in the data area that causes the no-signal state. As a result, the number of corrections can be reduced more than before and the deterioration of processing performance can be suppressed without impairing the correction capability. Also, by shortening the error correction time, the number of pages demodulated until the data output of the page containing the error is completed can be reduced, and the size of the data holding area required on the memory can be suppressed. can do.

In the first to fourth embodiments, the mechanical section 110
Although the optical disc device for reading the data of the optical disc has been described in the above, a reproducing device for reading the data of the magnetic disc, the magneto-optical disc, the magnetic tape or the like in the mechanical section 110 may be used. Further, an online data reproducing terminal may be provided by providing a receiving device of high speed data communication means instead of the mechanical section 110.

[0126]

As described above, according to the present invention, since the deterioration of the reproduction processing performance can be suppressed and the processing delay can be reduced, a reproducing apparatus having a small data holding area on the memory can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an optical disc device according to a first embodiment.

FIG. 2A is a timing chart showing data processed by each unit of the data conversion unit of the optical disc device according to the first embodiment, and FIG. 2B is a data conversion unit of the conventional optical disc device. 3 is a timing chart showing data processed by each unit of FIG.

3A is a diagram showing a structure of data including an error, which is read by the optical disc device of the first embodiment and a conventional optical disc device when the operation shown in FIG. 2 is performed, and FIG. (B) is a diagram showing a data structure when error correction is performed in the error correction unit.

FIG. 4 shows a configuration of an optical disc device according to a second embodiment.

5A is a timing chart showing data processed by each unit of the data conversion unit of the optical disc device of Embodiment 2, and FIG. 5B is a data conversion unit of the conventional optical disc device. 3 is a timing chart showing data processed by each unit of FIG.

6A is a diagram showing a structure of data including an error, which is read when the optical disk device of the second embodiment and the conventional optical disk device perform the operation shown in FIG. 5A, FIG. 6B is a diagram showing the structure of data when error correction is performed in the error correction unit.

FIG. 7 shows a configuration of an optical disc device according to a third embodiment.

FIG. 8A is a timing chart showing data processed by each unit of the data conversion unit of the optical disc device according to the third embodiment, and FIG. 8B is a data conversion unit of the conventional optical disc device. 3 is a timing chart showing data processed by each unit of FIG.

9A is a diagram showing a structure of data including an error, which is read when the optical disk device of the third embodiment and the conventional optical disk device perform the operation shown in FIG. 8A, FIG. 9B is a diagram showing the structure of data when error correction is performed in the error correction unit.

FIG. 10 shows a configuration of an optical disc device according to a fourth embodiment.

11A is a timing chart showing data processed by each unit of the data conversion unit of the optical disc device of Embodiment 4, and FIG. 11B is a data conversion unit of the conventional optical disc device. 3 is a timing chart showing data processed by each unit of FIG.

FIG. 12 is a diagram showing a configuration of a conventional optical disc device.

FIG. 13 is a timing chart showing data processed by each unit of the data conversion unit of the conventional optical disc device.

14A is a diagram showing data including an error, which is read by the optical disc device when the optical disc device performs the operations shown in FIGS. 13 and 15. FIG. 14
(B) is a diagram showing a data structure when error correction is performed in the error correction unit.

FIG. 15 is a timing chart showing data processed by each unit of a data conversion unit of a conventional optical disc device.

[Explanation of reference numerals] 100, 200, 300, 400, 1200 Optical disk devices 110, 1210 Mechanical operating parts (mechanical parts) 111, 1211 Spindle motors 112, 1212 Optical pickups 113, 1213 Output parts 120, 220, 320, 420, 1220 Data conversion section 121, 1221 Demodulation section 122, 1222 Memory 122a Defect information list 123, 1223 Error correction section 124, 1224 Error detection section 125, 1225 Data output section 126, 226, 326, 426, 1226 Control section 126a Drop recording position Confirmation unit 126b Correction direction switching unit 130, 1230 Host computer 226b Loss position setting unit 240 Reproduction signal state detection unit 301, 601, 901 Data area 302, 602, 902 C2 parity unit 326b Correction Stop judging section 426b correction processing determination unit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 20/10 G11B 20/10 C H03M 13/29 H03M 13/29 F term (reference) 5D044 AB07 BC04 CC04 DE68 FG10 5J065 AA01 AB01 AC03 AD02 AE06 AF03 AH06

Claims (6)

[Claims] 1. A receiving means for externally receiving a data group formed by continuous data of a certain period as a signal, a demodulating means for demodulating a signal transmitted from the receiving means, and a demodulating means for transmitting the signal. A storage unit having a storage unit for storing the data group and an error-containing data group storage unit for storing the data group containing the erroneous data; and the data of the data group is two-dimensionally arranged into a product code,
Error correction means for correcting an error in the data of the data group in at least one direction of the first direction of the product code or the second direction different from the first direction, and the error correction means. Error detecting means for detecting an error remaining in the corrected data of the data group, and the first group of data when detecting that the data group stored in the error-containing data group storage section is drop recording
Control direction for controlling the error correction means so as to correct an error in the data of the data group by switching from the one direction to the other direction, or the second direction. A reproducing apparatus having an output unit for outputting the group to the outside. 2. A receiving means for externally receiving a data group consisting of a series of data of a certain period as a signal, a demodulating means for demodulating a signal transmitted from the receiving means, and a demodulating means for transmitting the signal. A storage unit that stores a data group and an error-containing data group storage unit that stores a data group including an erroneous data; and data in the data group are two-dimensionally arranged into a product code, At least a first direction of the product code or the first direction
In any one of the second directions different from the direction of
Error correcting means for correcting an error in the data in the data group, error detecting means for detecting an error remaining in the data of the data group corrected by the error correcting means, and the data group received from the receiving means Signal level of
With reference to the data group received from the demodulating means, a signal state detecting means for outputting to the control means a no-signal data area for generating a no-signal state in the data group, and the error-containing data group storage section. Control for controlling the error correction means so as to perform erasure correction on the no-signal data area within the erasure-correctable range received from the signal state detection means when it is detected that the stored data group is drop recording. A reproducing apparatus comprising means and output means for outputting a data group from the storage means to the outside. 3. A receiving means for externally receiving a data group formed by continuous data of a certain period as a signal, a demodulating means for demodulating a signal transmitted from the receiving means, and a demodulating means for transmitting the signal. A storage unit that stores a data group and an error-containing data group storage unit that stores a data group including an erroneous data; and data in the data group are two-dimensionally arranged into a product code, At least a first direction of the product code or the first direction
In any one of the second directions different from the direction of
Error correcting means for correcting an error in the data in the data group, error detecting means for detecting an error remaining in the data of the data group corrected by the error correcting means, and the data group received from the receiving means Signal level of
With reference to the data group received from the demodulating means, a signal state detecting means for outputting a no-signal data area in the data group for generating a no-signal state to the error correcting means, and the error-containing data group storage section. When it is detected that the data group stored in the recording medium is drop recording, the signal-state detecting means receives the non-signal data area, and only in one of the first direction and the second direction. The error correction means is controlled to correct the data group, and the error detection means is controlled to ignore the error in the data group; and the data group is output from the storage means to the outside. And a reproducing device for outputting. 4. A receiving means for externally receiving a data group consisting of continuous data of a certain period as a signal, a demodulating means for demodulating a signal transmitted from the receiving means, and a demodulating means for transmitting the signal. A storage unit that stores a data group and an error-containing data group storage unit that stores a data group including an erroneous data; and data in the data group are two-dimensionally arranged into a product code, At least a first direction of the product code or the first direction
In any one of the second directions different from the direction of
Error correcting means for correcting an error in the data in the data group, error detecting means for detecting an error remaining in the data of the data group corrected by the error correcting means, and the data group received from the receiving means Signal level of
With reference to the data group received from the demodulating means, a signal state detecting means for outputting a no-signal data area in the data group for generating a no-signal state to the error correcting means, and the error-containing data group storage section. When the data group stored in is detected as drop recording, the error detecting means is configured to receive the non-signal data area from the signal state detecting means and ignore an error in the data group. A reproducing apparatus comprising control means for controlling and output means for outputting a data group from the storage means to the outside. 5. The reproducing apparatus according to claim 1, wherein the receiving means receives, as a signal, a data group in which data of a certain period is continuous from the optical disc. Playback device. 6. The reproducing apparatus according to claim 1, wherein the first direction and the second direction of the product code are orthogonal to each other.