JP2001332039A - Drive, data readout method, information recording medium reproducing device and data reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress error data reproduction while securing real-time characteristic of the data reproduction. SOLUTION: The data readout method includes a step which performs readout operation with respect to all a plurality of address regions specified among the plurality of address regions while holding readout error information being information about a readout error, when the readout error is generated at the time of reading data from one address region among the plurality of address regions, and a step which transfers readout data to a data reproduction device (138) to reproduce the readout data and reports the readout error information to the data reproduction device (138), in an information recording medium (115) having the plurality of address regions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive for reading data from an information recording medium having a plurality of address areas, a data reading method, and data reproduction based on read error information when reading data from the information recording medium. And a data reproducing method.

[0002]

2. Description of the Related Art An optical disk is known as an information recording medium for reading data from a plurality of address areas. An optical disc has a large capacity and can digitally record high-quality data. Among the optical discs, a DVD (digital versatile disc) having a particularly large capacity, and
Record the data on the DVD and / or
A DVD recording / reproducing apparatus for reproducing data from D is being commercialized. Optical discs are expected to record not only computer programs but also AV (audio video) data including at least one of audio data and video data, and optical discs used as digital information recording media will be further increased in the future. It is expected to evolve.

[0003] Not only read-only optical disks in which data is pre-recorded in the form of prepits by disk manufacturers, such as CDs and DVDs, but also recordable optical disks that allow users to record data at home, for example, DVs
D-RAMs and the like have been developed, and using them for recording and reproduction of television broadcasts, development of optical disk video recorders and the like as new products replacing conventional VHS and other video tape recorders is currently underway.

In an optical disk characterized by non-contact and high-density recording as described above, a tracking control technique for stably causing a laser beam to follow a track or land provided on the optical disk in advance, and an optical disk for forming a minute spot. Focus control technology and laser power control technology that achieves constant output power are essential. These control techniques require more and more precise control as the density of optical discs increases. By performing a systematic recovery process using these control techniques, stable recording and / or reproduction of the optical disc can be realized.

[0005]

However, it may not be possible to correctly reproduce data from an information recording medium such as an optical disk. Specifically, there are cases where it is impossible to correctly read data from the optical disk due to a defect on the optical disk such as a scratch or a fingerprint, or a case where it is impossible to read data correctly due to a defect at the time of reading. When the data recorded on the optical disc is AV data, the data generally includes MP data.
It is recorded as digital data compressed by the EG method. In this case, an I picture (intra-frame coded image)
P picture (inter-frame predictive coded picture) and B picture (bi-directional predictive coded picture) are predicted on the basis of, the effect on the output picture if the data relating to the reference I picture is not correctly reproduced. Is big. Also, data with real-time properties, such as AV data, has little time margin for performing systematic recovery processing, so it is necessary to sequentially read data.

FIG. 6 shows a conventional information recording medium reproducing apparatus 60.
It is a schematic diagram which shows 0. Information recording medium reproducing device 600
Includes a drive 610, a host system 630, and a connection bus 620 connecting the drive 610 and the host system 630. The host system 630 is connected to the output device 640. The drive 610 has an optical disk 615 mounted therein. The host system 630 includes a data reproducing device 635.

The drive 610 reads data from the optical disk 615 based on a read request from the host system 630, and reads the read data from the connection bus 620.
To the host system 630. The transferred data is reproduced by a data reproducing device 635 of the host system 630, and the reproduced data is output by an output device 640 such as a television. When the drive 610 reads data from the optical disc 615,
A read error may occur.

FIG. 7 is a flow chart showing a conventional data reading method that emphasizes that the drive 610 reports an address area where an error has occurred during reading to the host system 630.

When a read process is performed, the drive 61
0 receives a read request from the host system 630 to read data from the specified address area (step 701). In response to the read request, the drive 610 reads data from the optical disc 615 (Step 702). When no read error occurs when reading data from the optical disc 615 (step 7)
03), the drive 610 is connected to the host system 630,
It reports that the read operation of the optical disk 615 has been completed, and transfers the normally read data (step 7).
04), the read processing ends. If a read error occurs while reading data from the specified address area of the optical disc 615 (step 705), the drive 610 stops the read operation of the optical disc 615.
Next, the drive 610 sends the information to the host system 630,
The fact that a read error has occurred and the read operation has been completed, and the address area where the read error has occurred are reported, the data that has been read so far is transferred (step 706), and the read processing ends.

Therefore, in this data reading method,
When a read error occurs when reading the optical disk 615, the host system 630 can identify the address area where the read error has occurred and reproduce the data that has been read so far. However, the operation of reading data is stopped without reading data from all specified address areas.

FIG. 8 shows a conventional data reading method which focuses on continuously obtaining data in real time, rather than reporting to the host system 630 an address area where a read error has occurred during reading by the drive 610. It is a flowchart which shows.

When a read process is performed, the drive 61
0 receives a read request from the host system 630 so as to read data from the specified address area (step 801). In response to the read request, the drive 610 reads data from the optical disc 615 (Step 802). When no read error has occurred when reading data from the optical disc 615 (step 8)
03), the drive 610 is connected to the host system 630,
The end of the read operation is reported, the data that has been normally read is transferred (step 807), and the read processing ends. If a read error occurs while reading data from the specified address area of the optical disc 615 (step 804), the drive 610 sets the optical disc 6
It is determined whether or not the operation of reading data from all designated address areas has been completed without stopping the read operation of step 15 (step 805). If the read operation has not been completed, the address area where the read error has occurred is determined. The read operation is restarted from the next address area (step 806). Thereafter, steps 802 to 806 are repeated until the operation of reading data from all the specified address areas of the optical disk 615 is completed. When the data reading operation from the designated address area of the optical disc 615 is completed (step 805),
The drive 610 reports that the read operation of the optical disk 615 has been completed, transfers the read data to the host system 630 (Step 807), and ends the read processing. In this data reading method, the drive 6
10 continues the read operation even if a read error occurs, and finally, the host system 630 reproduces data read from all designated address areas.
However, in this data read method, a read error is not reported to the host system 630.

FIG. 9 shows a drive 61 controlled by the conventional data reading method described with reference to FIGS.
FIG. 11 is a flowchart showing a conventional data reproducing method by a host system 630 that gives a request to 0. Here, it is assumed that the host system 630 requests the drive 610 to read AV data from the optical disk 615. Since the AV data is generally recorded as data compressed by the MPEG method, an MPEG decoder is used as the data reproducing device 635.

The host system 630 controls the optical disk 61
5 is set as the starting sector address for reproducing data, and a read request is issued to the drive 610 so as to read data from the specified address area (step 9).
01). After the read request is issued from the host system 630, the host system 630 waits until receiving a read operation completion signal indicating that the read operation of the optical disk 615 has been completed from the drive 610 (step 90).
2). Thereafter, the host system 630 drives the drive 610
Is determined (step 903).
If no read error is reported to the host system 630, the host system 630 transfers all the read data to the decoder 635 that performs MPEG decoding (step 904). When the data is read by the data reading method shown in FIG. 8, even if a read error has occurred at the time of reading, no read error is reported to the host system 630, and erroneous data that cannot be decoded is output. It may be transferred to the decoder 635.
Even if erroneous data that cannot be decoded is transferred, the decoder 635 attempts to decode it, but does not decode well, and as a result, the output image appears to remain frozen. On the other hand, if a read error occurs while data is being read by the data read method shown in FIG.
Reports a read error (step 903). In this case, the read operation of the optical disc 615 stops due to the read error. The drive 610 transfers only the correct data read up to the address area where the read error has occurred, excluding the data in the address area where the read error has occurred, to the decoder 635 (step 905). Then, the address area next to the address area where the read error has occurred is specified, and the drive 610 starts the read operation again (step 906). In this case, the data reading operation of the optical disk 615 is temporarily stopped, so that the data transfer to the decoder 635 is temporarily stopped. Until the data read from the specified address area of the optical disk 615 by any of these methods is transferred to the decoder 635, the reading from the optical disk 615 and the transfer of the data to the host system 630 are repeated and continued (step 907).

According to the present invention, there is provided a drive and a data reading method for reading data such as AV data, which has a real-time property and in which read error information greatly affects a reproducing operation, from an information recording medium, and an information recording medium reproducing apparatus. It is an object to provide a data reproducing method.

[0016]

According to the data reading method of the present invention, a read error occurs when reading data from one of the plurality of address areas in an information recording medium having a plurality of address areas. Performing a read operation on all specified ones of the plurality of address areas while holding the read error information, which is information relating to the read error. Transferring the read data to a data reproducing device that reproduces the read data, and reporting the read error information to the data reproducing device.

[0017] The read error information may include read error presence / absence information indicating presence / absence of the read error.

The read error information may include read error cause information indicating a cause of the read error and read error occurrence address information indicating an address area where the read error has occurred.

The step of performing the read operation includes the step of holding the read data, and the step of reporting includes reading the read error occurrence address information and the current data holding state by the data reproduction. The method may include reporting to the device.

The step of reporting may include the step of adding the read error occurrence address information and the read error cause information to the data read from the information recording medium as a header.

The drive according to the present invention is a read section for reading data from an information recording medium having a plurality of address areas, wherein a read error occurs when reading data from one of the plurality of address areas. A read unit that generates read error information, which is information related to the read error, and performs a read operation on all specified ones of the plurality of address areas; A data holding unit for holding the read data and the read error information; and controlling the read unit and the data holding unit to transfer the read data to a data reproducing device for reproducing the read data. And a control unit for reporting the read error information to the data reproduction device.

The read error information may include read error presence information indicating the presence or absence of the read error.

The read error information may include read error cause information indicating a cause of the read error and read error occurrence address information indicating an address area where the read error has occurred.

The control unit may report the read error occurrence address information and the current state of the data holding unit to a data reproducing device.

When transferring the read data, the control unit may add the read error factor information and the read error occurrence address information to the transferred data as a header.

According to the data reproducing method of the present invention, when an error occurs in reading data from one of the plurality of address areas in an information recording medium having a plurality of address areas, Performing a read operation on all specified ones of the plurality of address areas while retaining read error information that is information relating to the read data, and data for reproducing the read data. Transferring the read data to a playback device and reporting the read error information to the data playback device; and transferring the read data to the data playback device in response to the read error information. Changing.

[0027] The read error information may include read error presence / absence information indicating presence / absence of the read error.

The read error information may include read error cause information indicating a cause of the read error and read error occurrence address information indicating an address area where the read error has occurred.

[0029] The read data may be AV data compressed in MPEG format, and the data reproducing device may decode the read data by MPEG.

The data read from all the address areas of the information recording medium includes a plurality of GOPs, and the changing step includes the step of causing the read error if the read error factor information indicates a data read disabled state. G including data read from the address area
The method may include a step of not transferring an OP to the data reproducing device.

In the step of performing the read operation, an error detection / correction operation is performed on data read from the information recording medium, and when the error detection / correction operation exceeds a correctable limit, an error correction limit state is indicated. Holding the read error cause information, wherein the changing step includes, if the read error cause information indicates an error correction limit state, transferring the read data to the data reproducing device. May be.

[0032] In the changing step, when the data read from the address area where the read error has occurred is an I picture, the GOP including the data read from the address area where the read error has occurred is reproduced. Skipped without transferring to the device, the data read from the address area where the read error occurred is B
In the case of a picture or a P picture, the method may include a step of transferring a GOP including data read from the address area where the read error has occurred to the data reproducing device.

[0033] In the changing step, when the data read from the address area where the read error has occurred is an I picture, the GOP including the data read from the address area where the read error has occurred is reproduced. When the data is skipped without being transferred to the device and the data in the address area where the read error has occurred is a B picture or a P picture, the B picture or P picture including the data read from the address area where the read error has occurred And transferring all data except the above to the data reproducing device.

The data read from all the address areas of the information recording medium includes a plurality of GOPs, and the changing step includes the step of:
If it occurs continuously over P, the data playback device may include stopping playback.

[0035] The step of stopping may include a step of warning that the use of the data reproducing device is impossible.

[0036] The changing step may include a step of changing the transfer of the data according to a command from a user.

The information recording medium reproducing apparatus of the present invention is a drive for reading data from an information recording medium having a plurality of address areas, and one of the plurality of address areas.
When a read error occurs when reading data from one address area, the read error information, which is information about the read error, is held in all of the plurality of specified address areas among the plurality of address areas. A drive that performs a read operation on the drive and a host system, the host system comprising: a data reproduction device that reproduces the read data; and a read operation to the data reproduction device based on the read error information. A host system that includes a CPU that controls the transfer of the issued data.

The read error information may include read error presence / absence information indicating presence / absence of the read error.

The read error information may include read error cause information indicating a cause of the read error and read error occurrence address information indicating an address area where the read error has occurred.

The data read from the information recording medium is AV data compressed in MPEG format, and the data reproducing device may decode the read data by MPEG.

Data read from all the address areas of the information recording medium includes a plurality of GOPs,
When the read error factor information indicates a data read disabled state, U may not transfer a GOP including data read from the address area where the read error has occurred to the data reproduction device.

The drive performs an error detection and correction operation on data read from the information recording medium, and when the error detection and correction operation exceeds a correctable limit, the read error factor indicating an error correction limit state. Hold information,
When the read error factor information indicates an error correction limit state, the CPU may transfer the read data to the data reproduction device.

When the data read from the address area where the read error has occurred is an I picture, the GOP including the data read from the address area where the read error has occurred is not transferred to the playback device. If the data read from the address area where the read error has occurred is a B picture or a P picture, the GOP including the data read from the address area where the read error has occurred is skipped to the data reproducing device. It may be transferred.

When the data read from the address area where the read error has occurred is an I picture, the GOP including the data read from the address area where the read error has occurred is not transferred to the reproducing device. If the skipped data read from the address area where the read error has occurred is a B picture or a P picture, the B picture or P picture including the data read from the address area where the read error has occurred is excluded. All data may be transferred to the data reproduction device.

Data read from all the address areas of the information recording medium includes a plurality of GOPs, and when the read error occurs continuously over two or more GOPs, the data reproduction device stops reproduction. May be.

When the reproduction of the data reproduction device is stopped, a warning may be issued that the use of the data reproduction device is impossible.

[0047] The host system may further include a panel control unit for transferring a command from a user to the CPU.

[0048]

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

(Embodiment 1) FIG. 1 is a schematic diagram of an information recording medium reproducing apparatus 100 according to Embodiment 1 of the present invention.
The information recording medium reproducing apparatus 100 includes a drive 110, a host system 130, and a connection bus 120 connecting the drive 110 and the host system 130. The host system 130 is connected to the output device 150. The information recording medium reproducing apparatus 100 also includes a panel 1
60 may be provided. The panel 160 includes, for example, input units for rewinding, pausing, stopping, playing, fast-forwarding, and recording, and can be input by a user.

The host system 130 includes a CPU 132
, An input / output control unit 134, a main storage unit 136, a data reproduction device 138, and a panel control unit 140. The CPU 132 can access the input / output control unit 134, the main storage unit 136, the data reproduction device 138, and the panel control unit 140. The CPU 132 reads out and executes the program stored in the main storage unit 136. The data reproducing device 138 reproduces data stored in the main storage unit 136 and outputs the data to the output device 150. For example, the data reproducing device 138 may decode the digitally compressed data into analog data and output the analog data to the external output device 150.

The drive 110 has a data holding unit 112
And a read unit 114 and a drive control unit 116. The drive 110 has an information recording medium 115.
Is installed. The information recording medium 115 is a DVD-R
It can be any optical disc such as AM. The drive control unit 116 controls the data holding unit 112,
14 and control of data input / output between the drive 110 and the host system 130. The drive control unit 116 also controls the entire drive 110.
The data holding unit 112 is a memory that temporarily stores transfer data when performing data transfer between the host system 130 and the reading unit 114, and speeds up input / output processing. The reading unit 114 moves or reads the access position of the information recording medium 115 in response to a request from the drive control unit 116. When the reading unit 114 determines that a reading error has occurred when reading the data, the reading unit 114 indicates information related to the reading error.
Generate read error information. The read error information is held in the data holding unit 112. Drive control unit 11
6 reports read error information to the host system 130 via the connection bus 120. In FIG. 1, the CPU
132 determines whether or not the data reproducing device 138 should reproduce the data read from the address area where the read error has occurred, based on the read error information. In addition, the data reproduction device 138 itself may have the determination function based on the read error information.

The drive control unit 116 reports not only the read error information but also the state of the data storage unit 112 to the data reproduction device 138 of the host system 130, so that the data reproduction device 138
2 can be reproduced in consideration of the amount of data held in 2 and / or error information.

The reading section 114 includes an information recording medium 115
When data is read from, read error information may be generated based on the result of an error detection and correction operation for correcting an error in the read data. When the reading unit 114 performs the error detection and correction operation, even if an error occurs in the data at the time of reading, the error can be corrected to a correct value. However, if the error amount is too large, the error correction operation limit may be exceeded and a correct value may not be obtained. In that case, the reading unit 114 determines that a reading error has occurred, and generates reading error information.

When the data read from the information recording medium 115 is AV data, a decoder having a moving picture decoding function can be used as the data reproducing device 138 of the host system 130. The video reproduced by the decoder 138 is output by the output device 150. In this specification, AV data means data including at least one of audio data and video data.

In the host system 130, the panel control unit 140 receives a user request from the panel 160 and transmits the request to the CPU 132. Input / output control unit 1
Reference numeral 34 denotes the drive 1 in response to a request from the CPU 132.
10 is issued to the host system 130 via the connection bus 120 to control data input / output.

FIG. 2 shows the details of the main storage unit 136 of the host system 130. The main storage unit 136 includes a reproduction data area 201 for storing data reproduced by the data reproduction device 138, and a management area 202 used by the CPU 132.
And the program area 203 where the CPU 132 executes and operates
including.

In the host system 130 having the above configuration, a data reproducing operation is performed as follows.

Panel control unit 14 of host system 130
A value of 0 indicates that a reproduction request is transmitted to the CPU 132 when a reproduction request is made by the user from the panel 160, for example. CPU132
Is used to transfer data read from the information recording medium 115 by the drive 110 to the reproduction data area 201 of the main storage unit 136 from the drive 110 via the input / output control unit 134.
Then, this data is reproduced by the data reproducing device 138.

On the other hand, the drive control unit 1 of the drive 110
Reference numeral 16 denotes a request to perform a read operation from all of the plurality of address areas specified by the read request from the host system 130, and positions (seeks) the reading unit 114 to the position of the requested address area. Do. Thereafter, the data read from the plurality of designated address areas is stored in the data holding unit 112.
Once and transferred to the host system 130.
When a read error occurs when reading data from one of the designated plurality of address areas, the reading unit 114 generates read error information, which is information about the read error. The data holding unit 112 holds the read error information. The read error information includes, for example, read error presence / absence information indicating presence / absence of a read error, read error cause information indicating a cause of the read error, and read error occurrence address information indicating an address area where the read error has occurred. However, the read error information is not limited to these. The data reproducing device 138 performs the data reproducing operation based on the read error information, for example, the read error presence / absence information, so that the data reproducing device 138 can continuously reproduce the data while distinguishing the reproducing operation.

The drive control unit 116 controls the information recording medium 1
After the read operation of the requested data is completed from the 15 designated address areas, a further read request is predicted, and the reading unit 114 is positioned to the next address area of the read-completed address area,
Data may be read from the data holding unit 112.

When the data recorded on the information recording medium 115 is AV data, since the AV data is generally recorded in a continuous address area, data in an address area following the accessed address area is accessed. Is likely to be At this time, the next request is a read request,
In addition, if the access is to an address area subsequent to the previously read address area, the drive control unit 116 transfers the data that has already been read to the data holding unit 112, thereby quickly performing a reproducing operation. be able to.

FIG. 3 shows the data holding unit 1 of the drive 110.
12 is shown in detail. The data holding unit 112 holds a data area 301 for holding data read from the information recording medium 115 and read error information generated when the data held in the data area 301 is read from the information recording medium 115. And a read state management area 302. As specific examples of the read error information, read error occurrence address information and read error factor information will be described. When a first read error occurs, the read state management area 302 stores first read error occurrence address information 303 and first read error factor information 304.
And hold. Next, when a second read error occurs, the read state management area 302 holds the second read error occurrence address information 305 and the read error cause information 306, and thereafter, every time a read error occurs, the read error occurs. Holds address information and read error cause information. Here, the read error presence / absence information is searched for whether or not data (specifically, read error occurrence address information and read error factor information) indicating that a read error has occurred is written in the read state management area 302. Can be determined.

(Embodiment 2) FIG. 4 is a flowchart showing a data reading method according to Embodiment 2 of the present invention.

When performing a read process, the host system 130 issues a read request to the drive 110 via the connection bus 120, including a start sector address at which reading is to be started and a data area for performing a read operation (step 401). ). Upon receiving the read request, the drive 110 starts reading data from all the address areas of the plurality of address areas specified from the set first sector address (step 4).
02). If no read error occurs when reading data from a plurality of designated address areas (step 403), the drive 110
0, the completion of the read operation is reported, the normally read data is transferred (step 409), and the read processing ends. If a read error occurs while reading data from one of the specified address areas (step 404),
The read unit 114 of the drive 110 generates read error information (for example, read error occurrence address information), and the data holding unit 112 of the drive 110 holds the read error occurrence address information (Step 405).
After the read error occurrence address information is held, if the read operation of all the address areas among the designated plurality of address areas is not completed, the drive 110
Resets the address area next to the address area where the read error has occurred, and starts the data read operation again (step 407). Steps 402 to 407 above
By repeating the above, even if a read error occurs,
The drive 110 can perform a read operation on all data in a plurality of designated address areas. However, it should be noted that the read operation of the drive 110 does not mean that all data is read correctly and reproducibly.

These operations are repeatedly performed until the data reading operation of all the address areas out of the plurality of designated address areas is completed. When the data read operation of all the address areas of the designated plurality of address areas is completed (step 408), if a read error has occurred during the read operation, the read data may be incorrect. Then, the read error information is reported to the host system 130 to notify that there is, and the read processing ends (step 410). The timing at which the read error information is reported may be an appropriate timing for the data reproducing device 138, and this timing may be determined based on, for example, the holding state of the main storage unit 136 and / or the data holding unit 112.

As described above, according to the present embodiment, even if a read error occurs, the reading of the information recording medium 115 is not interrupted, so that it is easy to maintain the real-time property of data reproduction. Since the address information is held, the information recording medium 1
It is possible to prevent transfer of unreproducible erroneous data to the data reproducing device 138 that reproduces data from the 15 address areas.

Also, an example has been described in which the read error information is reported to the data reproducing device 138 after the read operation has been performed on all the address areas of the designated plurality of address areas. May be arbitrary as long as the read operation is performed from a plurality of designated address areas without stopping the read operation.

(Embodiment 3) FIG. 5A is a flowchart showing a data reproducing method according to Embodiment 3 of the present invention.

When the information recording medium reproducing apparatus 100 is instructed to reproduce data from the information recording medium 115, the host system 130 designates a start sector address at which reading is started and a plurality of address areas from which data is read. A read request is issued to the drive 110 (step 501). Thereafter, the host system 130 waits for the read operation of all the address areas among the plurality of address areas designated by the drive 110 to be completed (step 502). When the host system 130 receives from the drive 110 that the data read operation has been completed, the host system 130 determines whether or not an error has occurred when reading the drive 110 (step 503). If no read error has occurred, the host system 130
The data read from the plurality of designated address areas is transferred to the data reproducing device 138 (step 50).
6).

When a read error occurs when reading one of the plurality of address areas,
The host system 130 queries the drive 110 for the address area where the read error has occurred, and specifies the address area (step 504). After specifying the address area in which the read error has occurred, the host system 130 changes the method of transferring data to the data reproducing device 138 according to the read error factor information in which the read error has occurred.

There are mainly two factors that the reading unit 114 determines as a read error.

The first factor is a defect on the information recording medium 115 such as a scratch or a fingerprint. This occurs because the reading unit 114 cannot actually read the address area of the information recording medium 115, or the reading unit 114 is out of tracking of the information recording medium 115. Tracking is performed on the information recording medium 115.
This operation is performed by the readout unit 114 in order to stably follow the track or land. In the present specification, when such a read error occurs, a “data read impossible state” is used as read error factor information.
Will be stored.

The second factor is a decrease in readability due to a defect on the information recording medium 115 or a state at the time of recording. As described above, by performing the error detection and correction operation on the read data by the reading unit 114, even if an error occurs at the time of reading, the error can be corrected to a correct value. However, if the error amount is large, the error correction operation limit is exceeded, and the error cannot be corrected to a correct value.

If the reading unit 114 determines that a correct value cannot be obtained even after performing the error correction operation, the reading unit 114 determines that a reading error has occurred. In this specification, when such a read error occurs, “error correction limit state” is stored as read error factor information.

In the following, an MPE is used as the information recording medium 115.
The description will be made assuming an optical disc storing AV data compressed in the G format and a decoder for decoding the AV data as the data reproducing device 138. However, it goes without saying that the present invention is not limited to these.

Hereinafter, FIG. 5A will be referred to again. After specifying the address area where the read error has occurred, the cause of the read error is determined (step 505).

If data cannot be read from the optical disk 115 due to a scratch on the optical disk 115 or a defect in the drive 110, that is, if the read error factor information indicates that data cannot be read, the read error is A GOP (Group of P) including data read from the generated address area
icture) is skipped and other data is transferred to the decoder 138 (step 507). Where GO
P is a unit for handling MPEG format screen data, and is a group of a plurality of screen data. Data read from all the address areas of the optical disk 115 includes a plurality of GOPs. Decoder data 13
Then, it is determined whether or not data reproduction has been completed (step 508).

Alternatively, if the read data is a defect of the optical disk 115 or
If the error exceeds the correction limit of the error detection and correction of the drive 110 due to the recording state of the drive 110, that is, if the read error factor information is “error correction limit state”, the decoder 138
All of the data read in expectation of the decoding capability of the decoder 138 are transferred to the decoder 138 (step 506). This operation is performed by the reading unit 11 of the drive 110.
This is because, even in the data determined to be the error correction limit in 4, at least a part of the data is considered to be correctly read data and may be decodable by the decode 138. On the other hand, the data determined to be in the unreadable state is incapable of being decoded (reproducible), and it is expected that an appropriate image will not be obtained even if the data is actually decoded and reproduced. After the data is transferred to the decoder 138, if the data reproduction is not completed (step 508), the operations of steps 501 to 508 are repeated until the data reproduction is completed.

As described above, in the present embodiment, the read error information generated by the read unit 114 of the drive 110 is effectively used, and erroneous data that cannot be reproduced is not sent to the data reproduction device 138 that performs reproduction. By performing such control, the reproduction time in the data reproduction device 138 can be reduced, and as a result, it is possible to maintain the real-time property of the data reproduced from the data reproduction device 138.

In the above description, when the read error information indicates that the data cannot be read, the GOP including the data read from the address area where the read error has occurred is not transferred to the decoder 138 and the next operation is performed. Is skipped. When the read error information is in the error correction limit state, only when the data read from the address area where the read error has occurred is an I picture, the GOP including the data read from the address area where the read error has occurred is read. Skipping may be performed, and when the data read from the address area where the read error has occurred is other than the I picture, all the read data may be transferred to the decoder 138. Here, in general, GO
P includes an I picture, a B picture, and a P picture.

FIG. 5B shows that the read error cause information is in the error correction limit state, and the data read from the address area where the read error has occurred is an I picture or B,
FIG. 11 is a flowchart according to a third embodiment for determining which one of the P pictures is a P picture. FIG. 5B differs from FIG. 5A in that step 509 is included between steps 505 and 506.

In step 505, if the read error factor information is in the error correction limit state, the CPU determines whether the data read from the address area where the read error has occurred is an I picture or a B or P picture.
132 or the data reproduction device 138 makes a determination (step 509). When the data read from the address area where the read error has occurred is an I picture, the GOP including the data read from the address area where the read error has occurred is skipped (step 507). When the data read from the address area where the read error has occurred is a B or P picture, all data read in expectation of the decoding capability of the decoder 138 is transferred to the decoder 138 (step 50).
6).

The I picture is a reference picture, and even a slight error affects other pictures. Therefore, it is necessary to skip all GOPs including data read from the address area where a read error has occurred. preferable. In contrast, a B picture or a P picture
Since the prediction is performed based on the I picture, if the data of the reference I picture is correct, all the read data is transferred to the decoder 138 (step 5).
06) It is considered that the output is not significantly affected.

Alternatively, as shown in FIG. 5C, when the data read from the address area where the read error has occurred is a B or P picture, only the picture including the data read from the address area where the read error has occurred is read. It is also conceivable to skip (step 51)
0).

In the present embodiment, an example is described in which the drive 110 is inquired of the address area where the read error has occurred. However, the same applies to the case where the read error information is added as a header of the read data and notified. The effect of is obtained. However, when the read error information is added as a header of the read data, generally, there is little possibility that a read error occurs, but it is necessary to add a header to all data. Therefore, in this case, most headers report that no read error has occurred as read error information. Therefore, the read error information may be reported from the drive 110 at an appropriate timing when the host system 130 is performing the data reproducing operation.

As described above, according to the present invention, the drive 11
Effectively use the read error information obtained from 0,
By controlling not to send erroneous data that cannot be reproduced to the data reproduction device 138, the data reproduction device 1
38, the reproduction time can be shortened, and the real-time property of the reproduced data can be maintained.

Further, a GOP having two or more read errors
, The data reproduction operation of the decoder 138 may be stopped because sufficient reproduction cannot be obtained. Specifically, since the playback time of one GOP is generally about 0.5 to 1 second, 5 to 6 (ie, 3
If the read error continues, the reproduction operation may be stopped because the real-time property may be impaired. Further, in this case, since there is a possibility that the data reading error has occurred due to the dirt on the optical disk 115 due to fingerprints or the like, for example, “the optical disk 115 may be dirty with fingerprints or the like. Please try again later. " With this warning, it is also possible to educate about handling of the optical disk 115.

In the above description, A is mainly used as data.
Although V data is taken up, the present invention is not limited to this. However, AV data is more suitable for applying the present invention because it requires more real-time properties.

[0089]

As described above, according to the present invention, even if a read error occurs when reading data from a drive, the read operation is not interrupted, so that data to be transferred to the data reproducing device can be obtained continuously, and It is easy to maintain the performance. Further, the data transferred to the data reproducing device effectively suppresses the interruption or disturbance of the reproduction (for example, a moving image) of the data output from the data reproducing device by effectively utilizing the read error information obtained from the drive. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an information recording medium reproducing device according to a first embodiment of the present invention.

FIG. 2 shows details of a main storage unit of the host system.

FIG. 3 shows details of a data holding unit of the drive.

FIG. 4 is a flowchart showing a data reading method according to a second embodiment of the present invention.

FIG. 5A is a flowchart showing a data reproducing method according to Embodiment 3 of the present invention.

FIG. 5B is a flowchart showing a data reproducing method according to Embodiment 3 of the present invention.

FIG. 5C is a flowchart showing a data reproducing method according to Embodiment 3 of the present invention.

FIG. 6 is a schematic diagram showing a conventional information recording medium reproducing device.

FIG. 7 is a flow chart showing a conventional data read method focused on reporting a read error.

FIG. 8 is a flowchart showing a conventional data read method focusing on a data read operation.

FIG. 9 is a flowchart showing a data reproducing method using a conventional optical disk reproducing device.

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) G11B 20/10 321 G11B 20/10 321Z (72) Inventor Hiroshi Ueda 1006 Odakadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Kenji Takauchi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.F-term (reference) 5D044 AB05 AB07 BC03 BC04 CC06 DE38 DE69 FG10 FG19 GK08

Claims (32)

[Claims] In an information recording medium having a plurality of address areas, when a read error occurs when reading data from one of the plurality of address areas, the read information is information relating to the read error. Performing a read operation on all specified ones of the plurality of address areas while retaining the error information; and reading the read data to a data reproducing device that reproduces the read data. Transferring the read data and reporting the read error information to the data reproducing device. 2. The read error information includes read error presence / absence information indicating presence / absence of the read error.
The data reading method according to claim 1. 3. The data according to claim 1, wherein the read error information includes read error cause information indicating a cause of the read error, and read error occurrence address information indicating an address area in which the read error has occurred. Read method. 4. The step of performing the read operation includes the step of holding the read data, and the step of reporting includes reading the read error occurrence address information and a current data holding state. 4. The data reading method according to claim 3, comprising a step of reporting to the data reproducing device. 5. The data according to claim 3, wherein the reporting step includes a step of adding the read error occurrence address information and the read error factor information to the data read from the information recording medium as a header. Read method. 6. A reading section for reading data from an information recording medium having a plurality of address areas, wherein when a read error occurs when reading data from one of the plurality of address areas, A read unit that generates read error information, which is information relating to a read error, and performs a read operation on all specified ones of the plurality of address areas; and A data holding unit for holding the read error information; and controlling the read unit and the data holding unit to transfer the read data to a data reproducing device for reproducing the read data. A control unit for reporting the read error information to the device. 7. The read error information includes read error presence / absence information indicating presence / absence of the read error.
The drive according to claim 6. 8. The drive according to claim 6, wherein the read error information includes read error cause information indicating a cause of the read error, and read error occurrence address information indicating an address area where the read error has occurred. . 9. The drive according to claim 8, wherein the control unit reports the read error occurrence address information and the current state of the data holding unit to a data reproducing device. 10. The control unit according to claim 8, wherein, when transferring the read data, the control unit adds the read error factor information and the read error occurrence address information to the transferred data as a header. The mentioned drive. 11. In an information recording medium having a plurality of address areas, when a read error occurs when reading data from one of the plurality of address areas, the information is information on the read error.
Performing a read operation on all specified ones of the plurality of address areas while holding the read error information; and providing the read data to a data reproducing device that reproduces the read data. Transferring the output data and reporting the read error information to the data reproducing device; and changing a transfer method of the read data to the data reproducing device according to the read error information. And a data reproducing method. 12. The data reproducing method according to claim 11, wherein the read error information includes read error presence / absence information indicating presence / absence of the read error. 13. The data according to claim 11, wherein the read error information includes read error cause information indicating a cause of the read error, and read error occurrence address information indicating an address area where the read error has occurred. Playback method. 14. The read data is AV data compressed in the MPEG format, and the data reproducing device converts the read data to MP
14. The data reproducing method according to claim 13, wherein EG decoding is performed. 15. The data read from all the address areas of the information recording medium includes a plurality of GOPs, and the changing step includes the step of: when the read error factor information indicates a data read disabled state, the read error is 15. The data reproducing method according to claim 14, comprising a step of not transferring a GOP including data read from the generated address area to the data reproducing device. 16. The step of performing the read operation,
Performing an error detection and correction operation on the data read from the information recording medium, and, when the error detection and correction operation exceeds a correctable limit, holding the read error factor information indicating an error correction limit state. The step of changing includes, when the read error factor information indicates an error correction limit state, transferring the read data to the data reproducing device.
The data reproducing method according to claim 14. 17. The method according to claim 17, wherein, if the data read from the address area where the read error has occurred is an I-picture, a GOP including the data read from the address area where the read error has occurred is provided. When the data read from the address area where the read error has occurred is a B picture or a P picture,
17. The data reproducing method according to claim 16, further comprising: transferring a GOP including data read from the address area where the reading error has occurred to the data reproducing device. 18. The method according to claim 18, wherein, if the data read from the address area where the read error has occurred is an I picture, a GOP including the data read from the address area where the read error has occurred is provided. The data is skipped without being transferred to the reproduction device, and the data in the address area where the read error has occurred is B
17. The method according to claim 16, further comprising a step of transferring all data except for a B picture or a P picture including data read from the address area where the read error occurs to the data reproduction device, if the picture or the P picture is a picture or a P picture. Data reproduction method described. 19. The data read from all the address areas of the information recording medium includes a plurality of GOPs, and the changing step includes the step of: when the read error occurs continuously over two or more GOPs, The data reproducing method according to claim 14, wherein the reproducing device includes a step of stopping the reproduction. 20. The data reproducing method according to claim 19, wherein the step of stopping includes a step of warning that the use of the data reproducing device is impossible. 21. The data reproducing method according to claim 11, wherein the changing step includes a step of changing the transfer of the data according to a command from a user. 22. A drive for reading data from an information recording medium having a plurality of address areas, wherein a read error occurs when reading data from one address area of the plurality of address areas. A drive and a host system, which perform a read operation on all specified ones of the plurality of address areas while holding read error information, which is information relating to an error; A host system including: a data reproduction device that reproduces the read data; and a CPU that controls transfer of the read data to the data reproduction device based on the read error information. An information recording medium reproducing device comprising: 23. The information recording medium reproducing apparatus according to claim 22, wherein the read error information includes read error presence / absence information indicating presence / absence of the read error. 24. The information according to claim 22, wherein the read error information includes read error cause information indicating a cause of the read error, and read error occurrence address information indicating an address area where the read error has occurred. Recording medium playback device. 25. The data read from the information recording medium is AV data compressed in an MPEG format, and the data reproducing device converts the read data into MP data.
The information recording medium reproducing device according to claim 24, which performs EG decoding. 26. Data read from all the address areas of the information recording medium includes a plurality of GOPs, and the CPU generates the read error when the read error factor information indicates a data read disabled state. GO containing data read from address area
26. Do not transfer P to the data playback device.
An information recording medium reproducing device according to claim 1. 27. The drive performs an error detection and correction operation on data read from the information recording medium,
When the error detection / correction operation exceeds the correctable limit, the read error factor information indicating the error correction limit state is held. When the read error factor information indicates the error correction limit state, the CPU performs the read operation. 26. The information recording medium reproducing apparatus according to claim 25, wherein the reproduced data is transferred to the data reproducing device. 28. When the data read from the address area where the read error has occurred is an I picture, a GOP including the data read from the address area where the read error has occurred is transferred to the playback device. If the data read from the address area where the read error occurred is a B picture or a P picture,
28. The information recording medium reproducing apparatus according to claim 27, wherein a GOP including data read from the address area where the reading error has occurred is transferred to the data reproducing device. 29. When the data read from the address area in which the read error has occurred is an I picture, a GOP including data read from the address area in which the read error has occurred is transferred to the playback device. If the data read from the address area where the read error occurred is a B picture or a P picture,
28. The information recording medium reproducing apparatus according to claim 27, wherein all data excluding a B picture or a P picture including data read from the address area where the reading error has occurred is transferred to the data reproducing device. 30. Data read from all the address areas of the information recording medium includes a plurality of GOPs, and when the read error occurs continuously over two or more GOPs, the data reproducing device reproduces the data. 26. The information recording medium reproducing device according to claim 25, wherein the information recording medium reproducing device is stopped. 31. The information recording medium reproducing apparatus according to claim 30, wherein when the reproduction of the data reproducing device is stopped, a warning that the use of the data reproducing device is impossible is issued. 32. The information recording medium reproducing apparatus according to claim 22, wherein the host system further includes a panel control unit that transfers a command from a user to the CPU.