JP2014182852A - Reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproducing device that is able to precisely replace reproduced error-having data, which is stored in an accumulating device, with correct data.SOLUTION: An FE control section 10 outputs the result of correcting an error, as the error correction information of reproduced data. An accumulation device 12 accumulates and stores reproduced data such that the reproduced data correspond to the error correction information from the FE control section 10. For reproduced data in which correction error information is error, the read address of a disk d is stored in a re-read data table. When reproduced data whose error correction information is correct is accumulated after reproduced data whose error correction information is error is accumulated in the accumulation device 12, a BE control section 11 instructs the FE control section 10 to read, from a disk d, data about read address stored in a re-read data table, and to reproduce the data. The reproduced data whose error correction information accumulated and stored in the accumulating device 12 is error is replaced with reproduced data whose error correction information is correct.

Description

  The present invention relates to a playback apparatus for playing back data read from a storage medium such as a BD (Blu-ray Disc is a registered trademark / hereinafter omitted).

  In a conventional playback device, when data stored in a storage medium such as a BD is stored / stored in the storage device in a state permitted by managed copy, an error occurs when reading from the storage medium In this case, the error occurrence address data of the storage medium is read a plurality of times as error recovery processing, and stored and stored in the storage device when normal reproduction data is acquired. For this reason, when normal reproduction data cannot be obtained even if error recovery processing is continued due to external factors, abnormal reproduction data including an error remains stored in the storage device.

In addition, since the timing for eliminating external factors has not been considered in the past, abnormal reproduction data stored and stored in the storage device as described above is complemented with normal reproduction data even if the external factors are eliminated. It stays as it is.
Therefore, the reproduction data read from the storage device and output to an external device such as an audio device or a video device becomes defective data, which deteriorates the data quality.

  In the recording apparatus described in Patent Document 1, when data such as a received broadcast program is recorded in a storage device, information (recording quality evaluation information) for identifying a poor quality data portion is associated with the recording apparatus. I remember it. When recording data is output, this information is used to display a warning when the recording quality is poor, or when the same program is scheduled to be broadcast, the corresponding part is complemented (replaced).

JP 2010-67305 A

In the conventional technology, when data is read from a storage medium and reproduced, there is a problem that even if an error occurs in the reproduced data due to an external factor, the reproduced data may be continuously stored in the storage device. .
In addition, Patent Document 1 discriminates abnormal recording data using the recording quality evaluation information, but similarly does not determine whether or not the factor causing the abnormality in the data has been eliminated. For this reason, even if the same program is received and an attempt is made to supplement abnormal recording data, if the cause of the abnormality is not eliminated, data of poor quality is recorded as well.

  For example, in an in-vehicle playback device, there is a high possibility that playback data including an error is stored and stored in the storage device due to an external factor such as a temperature change of the vehicle. In order to supplement such reproduction data with correct data, it is necessary to monitor external factors of errors when accumulating and storing the reproduction data in the storage device, and to replace the data with data obtained when this is resolved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reproducing apparatus that can accurately replace reproduced data having errors stored in a storage apparatus with correct data.

  A playback device according to the present invention includes a front-end control unit that controls playback of data stored in a storage medium, a storage device that stores and stores playback data played back from the storage medium, and playback stored in the storage device In a playback device including a back-end control unit that reads and outputs data, the front-end control unit outputs error correction results as correct / incorrect information of the playback data, and the storage device uses the correct / incorrect information from the front-end control unit. The reproduction data is stored and stored in association with each other, and for the reproduction data with incorrect / wrong information, the read address of the storage medium is stored again in the data table, and the back-end control unit reproduces the error information with the error information in the storage device. When the playback data is stored with correct / wrong information after the data is stored, the front end control unit is instructed and replayed. The read address data stored in the read data table is read from the storage medium and played back, and the correct / incorrect information stored / stored in the storage device is replaced with the correct playback data. .

  According to the present invention, there is an effect that reproduction data having an error stored in the storage device can be accurately replaced with correct data.

It is a block diagram which shows the structure of the reproducing | regenerating apparatus based on this invention. 3 is a flowchart showing the operation of the playback device according to the first embodiment. It is a figure which shows the data preserve | saved at the storage device, FE error information, and correct / incorrect information. 6 is a diagram illustrating an example of a reread data table according to Embodiment 1. FIG. It is a figure which shows the data preserve | saved in the storage device after performing a complementation process to correct data, FE error information, and correct / incorrect information. FIG. 3 is a diagram showing data reading from the disk in the first embodiment. It is a figure which shows the data preserve | saved in the storage device, FE error information, temperature information, and correct / incorrect information in Embodiment 2. It is a figure which shows the process which complements the reproduction data with an error with correct data in Embodiment 2. FIG. FIG. 11 is a diagram illustrating data stored in a storage device, FE error information, servo information, and correct / incorrect information in Embodiment 3. FIG. 10 is a diagram illustrating a process of supplementing reproduced data with errors with correct data in the third embodiment. FIG. 20 is a diagram illustrating an example of a re-read data table in the fourth embodiment. FIG. 22 is a diagram illustrating an example of a reread data table in the fifth embodiment.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of a playback apparatus according to the present invention, and shows a case where the present invention is applied to a disk playback apparatus that plays back data read from a storage medium (disk d) such as a BD. A disc playback device 1 shown in FIG. 1 is a playback device that is mounted on a moving body (for example, a vehicle) and plays back data read from a disc d, and includes a front end unit 2, a back end unit 3, and a system control unit 4. It is configured with.
The front end unit 2 includes a PU (optical pickup unit) 5, a reproducing unit 6, a disk drive unit 7, a temperature sensor 8, a vibration sensor 9, and an FE control unit (front end control unit) 10. The back end unit 3 includes a BE control unit (back end control unit) 11, a storage device 12, and an output unit 13.

  In the front end unit 2, the PU 5 is a component that optically reads a recording signal from the disk d, and includes, for example, a light emitting element (laser diode) (not shown), an objective lens, a light receiving element, and an actuator. The actuator moves the objective lens toward and away from the disk d and in the radial direction. The objective lens is moved by this actuator, the light beam from the light emitting element is condensed on the recording (pit) surface of the disk d by the objective lens, and the reflected light component of the light beam is received by the light receiving element as a recording signal. .

The playback unit 6 has a function of generating playback data by performing decoding processing on data read from the disk d by the PU 5. The reproduction data is stored and stored in the storage device 12 through the FE control unit 10 and the BE control unit 11 in a state permitted by managed copy.
The disk drive unit 7 is a drive unit that rotationally drives the disk d, and includes a spindle motor or the like. The temperature sensor 8 is a sensor that detects the ambient temperature of the disk d, and the vibration sensor 9 is a sensor that detects vibration applied to the disk reproducing device 1.

The FE control unit 10 is a control unit that controls the operation of the front-end components 5 to 7 that reproduce data read from the disk d.
Further, the FE control unit 10 outputs an error correction result as correct / incorrect information of the reproduction data when the reproduction unit 6 generates the reproduction data. That is, the FE control unit 10 performs error detection and correction of the reproduced data using the error correction code added to the data stored in the disk d.
In the first embodiment, the correct / incorrect information is information indicating whether or not there is an error in error detection and correction by “correct” or “incorrect”.

The BE control unit 11 is a control unit that reads reproduction data from the storage device 12 and outputs it to the output unit 13 in accordance with an instruction from the system control unit 4.
Further, the BE control unit 11 inputs reproduction data generated by the front end unit 2 and outputs it to the storage device 12 in a state permitted by managed copy.
The storage device 12 inputs the reproduction data via the BE control unit 11, and stores and stores the addressed data in its own storage area.

Further, the BE control unit 11 instructs the FE control unit 10 to reread the data table when reproduction data with correct / wrong information is accumulated after the reproduction data with incorrect / wrong information is accumulated in the storage device 12. The data at the read address stored in is read from the disk d and reproduced, and the reproduction data in which the correct / incorrect information is stored in the storage device 12 is replaced with the reproduction data in which the correct / incorrect information is correct.
Further, the BE control unit 11 instructs the FE control unit 10 to store the reproduction data on the disk d when the reproduction data with the correct / wrong information is accumulated after the reproduction data with the incorrect / wrong information is accumulated in the storage device 12. Change the access method from before. For example, the access speed for the disk d is made faster than before.

The storage device 12 is a memory that stores and stores the playback data played back by the front end unit 2. As the storage device 12, for example, a hard disk device (HDD) included in the disk reproducing device 1 or a large-capacity nonvolatile memory is used.
The output unit 13 is an output unit that outputs the reproduction data read from the storage device 12. Examples of the output unit 13 include an audio device that outputs audio reproduction data and a video device that displays video reproduction data.

The system control unit 4 is a control unit that controls the FE control unit 10 and the BE control unit 11, and transmits a user request input using an input unit (not shown) to the FE control unit 10 or the BE control unit 11. For example, when the output of the reproduction data stored in the storage device 12 is requested, this request is output from the system control unit 4 to the BE control unit 11. Upon receiving this request, the BE control unit 11 reads the corresponding reproduction data from the storage device 12 and outputs it to the output unit 13.
Thereby, the user can view the requested reproduction data.

Next, the operation will be described.
FIG. 2 is a flowchart showing the operation of the playback apparatus according to the first embodiment, and shows the operation of the disk playback apparatus 1 of FIG.
First, the PU 5 of the front end unit 2 reads data from the disk d (step ST1), and the playback unit 6 plays back the read data (step ST2).
Next, the FE control unit 10 uses the error correction code added to the data stored in the disk d to perform error detection and correction on the reproduction data of this data, and the FE error (the detection result is an error). It is determined whether or not (step ST3).

When there is an FE error (step ST3; YES), the FE control unit 10 outputs to the BE control unit 11 correct / incorrect information indicating that there is an FE error, reproduction data and a read address corresponding thereto. The correct / incorrect information is information indicating “false” when there is an FE error and “correct” when there is no FE error.
The BE control unit 11 outputs the correct / incorrect information, the reproduction data, and the read address input from the FE control unit 10 to the storage device 12.
The storage device 12 updates the content of the reread data table by storing the read address of the reproduction data having the FE error on the disk d in the reread data table (step ST4).
Furthermore, the storage device 12 stores and stores the reproduction data in a storage area different from the reread data table in association with the correct / incorrect information (step ST5).

  When there is no FE error (step ST3; NO), the FE control unit 10 outputs to the BE control unit 11 correct / incorrect information indicating that there is no FE error, reproduction data and a read address corresponding thereto. When the BE control unit 11 recognizes that there is no FE error from the correct / incorrect information, the BE control unit 11 refers to the reread data table in the storage device 12 to determine whether there is a read address (step ST6).

  When there is no address in the re-read data table (step ST6; NO), the BE control unit 11 determines that the reproduction data having the error information is not stored in the storage device 12, and proceeds to step ST5. Thereby, the storage device 12 stores and stores the reproduction data in association with the correct / incorrect information.

On the other hand, when there is an address in the reread data table (step ST6; YES), the BE control unit 11 determines that the reproduction data with correct / wrong information has been accumulated after the reproduction data with incorrect / wrong information is accumulated in the storage device 12. to decide.
In this case, as shown in FIG. 3, reproduction data (data at address BBB) in which the correct / incorrect information is incorrect is generated due to an external factor, and thereafter, the external data is eliminated and the correct / incorrect information is correct in reproduction data (address CCC). It is considered that the following data) was generated. For example, an error occurs due to vibrations applied to the disk reproducing apparatus 1. If the vibrations are cured, correct reproduction data can be obtained.

  As described above, according to the present invention, the timing at which the external factor causing the error is eliminated is determined based on the correct / incorrect information and the contents of the re-read data table, and the data to be complemented is stored in the disk d at the timing at which the external factor is eliminated. Is read again, and complementation is performed when correct reproduction data is obtained.

  For example, as shown in FIG. 3, when the reproduction data 2 having the error information is generated, the read address BBB of the reproduction data 2 is stored in the re-read data table as shown in FIG. Subsequently, when the reproduction data 3 with correct / wrong information is generated, the storage device 12 stores the reproduction data regardless of whether the correct / incorrect information is incorrect or correct. Therefore, whether or not there is a read address in the reread data table. By referring to the above, it is possible to know whether or not the reproduction data having the correct / wrong information is stored after the reproduction data having the correct / wrong information is incorrect.

  In the example of FIG. 2, when the reproduction data with correct / wrong information is accumulated in the storage device 12 after the reproduction data with correct / wrong information is accumulated, the BE control unit 11 first instructs the FE control unit 10. The access method to the disk d is changed from before (step ST7). Here, for example, the conventional access speed (1 × speed) is changed to 2 × speed.

  Subsequently, the BE control unit 11 instructs the FE control unit 10 to read out and reproduce the read address data stored in the reread data table from the disk d (step ST8). In the examples of FIGS. 3 and 4, the data at the read address BBB is read from the disk d and reproduced.

  Next, using the error correction code added to the reread data, the FE control unit 10 performs error detection correction on the reproduced data of this data, and determines whether or not there is an FE error (step ST9). . At this time, if there is an FE error (step ST9; YES), the FE control unit 10 discards the re-read reproduction data (step ST10), returns to step ST2, and repeats the above-described processing.

If there is no FE error (step ST9; NO), the FE control unit 10 outputs to the BE control unit 11 correct / incorrect information indicating that there is no FE error, reproduction data and a read address corresponding thereto. The BE control unit 11 replaces (overwrites) the reproduction data in which the correct / incorrect information is stored and stored in the storage device 12 with the correct reproduction data in which the correct / incorrect information is correct (step ST11). In the example of FIGS. 3 and 4, the data at the read address BBB is overwritten with the correct reproduction data, and the correct / incorrect information becomes “correct” data as shown in FIG.
In addition, when complementing with correct data, the BE control unit 11 discards the read address stored in the reread data table for this data.

FIG. 6 is a diagram showing data reading from the disc in the first embodiment, and FIG. 6A shows a case where reproduced data having errors stored in the storage device 12 is not complemented. 6 (b) shows a case where the reproduction data having an error is complemented with correct data by judging the timing at which the error factor has been eliminated as shown in FIG.
Data reading from the disk d when the above complement is not performed is performed at a normal access speed (single speed) as shown in FIG. 6A, for example. When a read address is designated, data corresponding to this address is read from the disk d until the next address is requested to be read.
In this state, even if the data of the read address BBB becomes an FE error and the correct / wrong information becomes “wrong”, the reproduction data is stored in the storage device 12 in the read order. Data 2 to be stored is stored as it is.

As shown in FIG. 6B, when data 2 that is a reproduction data group with incorrect / wrong information is generated, the read address BBB of the reproduction data 2 is stored in the re-read data table as shown in FIG. The Subsequently, when data 3, which is a reproduction data group with correct correct / incorrect information, is generated, reproduction data (data 2) with incorrect / incorrect information is stored by referring to whether there is a read address BBB in the reread data table. Then, it is possible to know whether or not reproduction data (data 3) with correct / wrong information is stored.
The BE control unit 11 instructs the FE control unit 10 to access the disk d at twice the previous access speed (double speed), judging that the error factor has been eliminated. As a result, the data 4 at the address DDD requested to be read last is read from the disk d at double speed. In this case, since the access speed is doubled, reading and reproduction of data 4 are completed in half the time of data 3.
Subsequent to this, the BE control unit 11 starts the data 2 complementing process, instructs the FE control unit 10 to read the data 2 at the address BBB from the disk d again at double speed and reproduce it. If the correct / incorrect information of the data 2 is correct, the incorrect data 2 stored in the storage device 12 is overwritten with the data 2. Thereby, as shown in FIG.6 (b), it complements with the correct data 2. FIG. By doubling the access speed in this way, data can be supplemented in half the normal time.

  In the above description, the case where the access method to the disk d is changed has been shown. However, even if the access method is not changed, the timing at which the error factor has been resolved is determined, so that it is stored in the storage device 12. It is possible to accurately supplement the abnormal reproduction data with normal data.

As described above, according to the first embodiment, the FE control unit 10 outputs the error correction result as the correct / incorrect information of the reproduction data, and the storage device 12 associates the reproduction data with the correct / incorrect information from the FE control unit 10. Is stored and stored, and the read data of the disk d is stored in the read-out data table for the reproduction data in which the error information is incorrect, and the BE control unit 11 stores the reproduction data in which the error information is incorrect in the storage device 12. When the reproduction data with correct / wrong information is accumulated after that, the FE control unit 10 is instructed to read out the read address data stored in the re-read data table from the disk d and reproduce it, and the accumulation device 12 The stored reproduction data in which the correct / incorrect information is incorrect is replaced with the reproduction data in which the correct / incorrect information is correct.
By doing so, it is possible to accurately replace the reproduction data having an error stored in the storage device 12 with correct data in accordance with the timing at which the error factor is eliminated.

In addition, according to the first embodiment, the BE control unit 11 performs the FE control unit 10 when the reproduction data with correct / wrong information is accumulated after the reproduction data with incorrect / wrong information is accumulated in the storage device 12. To change the access method to the disk d from the past.
In particular, by making the access speed to the disk d faster than before, it is possible to supplement erroneous data with correct data in a faster time than usual.

Embodiment 2. FIG.
The second embodiment describes a case where whether or not the ambient temperature of the disk d is outside a predetermined range is added to the correct / incorrect information. Here, the predetermined range is a temperature range in which data can be normally read from the disk d, and if it is higher or lower than this range, there is a high possibility that an error will occur in the reproduced data.
Note that the playback apparatus according to the second embodiment has the same basic configuration as that of the first embodiment, and therefore, in the following description, refer to FIG. 1 for the apparatus configuration.

  FIG. 7 is a diagram illustrating data, FE error information, temperature information, and correct / incorrect information stored in the storage device in the second embodiment. The temperature information is information indicating whether or not the ambient temperature of the disk d is outside the predetermined range, and is “normal” if it is within the predetermined range, and “abnormal” if it is outside the predetermined range. . In the example of FIG. 7, since temperature information is abnormal, a case where an FE error has occurred in data 1 and data 2 in the reproduction data group before being stored in the storage device 12 is shown. In this case, data is read by accessing the disk d by a different access method depending on whether the temperature information is abnormal at a temperature higher than a predetermined range or abnormal at a low temperature.

  FIG. 8 is a diagram illustrating a process of complementing reproduced data with errors with correct data in the second embodiment. In the example of FIG. 8, the temperature information is abnormal because the ambient temperature of the disk d detected by the temperature sensor 8 is lower than a predetermined range, thereby causing an FE error. At this time, the FE control unit 10 notifies the BE control unit 11 that the temperature information is abnormal at a low temperature. When the temperature information becomes abnormal at a low temperature, the BE control unit 11 instructs the FE control unit 10 to increase the access speed to the disk d than before.

  In FIG. 8, when an error occurs in the data 1 read and reproduced from the disk d due to abnormal temperature information (low temperature), the BE control unit 11 instructs the FE control unit 10 to immediately access the disk d. Is doubled. By doing so, the amount of heat generated by the entire system (for example, LSI) increases, the ambient temperature rises, and data reading can be performed so that the correct reproduction data is stored in the storage device 12 as much as possible.

When the data 2 is read from the disk d and reproduced, the temperature is still low, and the data 2 also has an error due to abnormal temperature information (low temperature). Thereafter, when the data 3 is read from the disk d and reproduced, the ambient temperature falls within a predetermined range, and the correct data 3 with correct / incorrect information is stored in the storage device 12. At this time, as in the first embodiment, the BE control unit 11 refers to the reread data table, so that the reproduction data with the correct / wrong information is accumulated in the storage device 12 and the reproduced data with the correct / wrong information is correct. It is determined that the accumulated state, that is, the timing at which the error factor due to temperature has been eliminated.
Subsequently, the BE control unit 11 instructs the FE control unit 10 to store the data 4 and 5 requested to be read in the storage device 12, and then starts the complementary processing for the data 1 and the data 2.

In this way, by changing the access method to the disk d and actively changing the temperature environment that causes an error, data reading can be performed so that the reproduction data as correct as possible is stored in the storage device 12.
FIG. 8 shows a case where the access speed to the disk d is increased when an error occurs at a low temperature. However, the same effect can be obtained by increasing the number of accesses to the disk d within a predetermined time. Can be obtained.

Next, consider a case where the temperature information becomes abnormal because the ambient temperature of the disk d detected by the temperature sensor 8 is higher than a predetermined range, thereby causing an FE error.
In this case, the BE control unit 11 instructs the FE control unit 10 to reduce the number of accesses to the disk d within a predetermined time than before. As a result, the amount of heat generated by the entire system (for example, LSI) is reduced and the ambient temperature is lowered, so that the data can be read so that the correct reproduction data is stored in the storage device 12 as much as possible.
When the ambient temperature falls and falls within a predetermined range, and data with correct / wrong information is stored in the storage device 12, the BE control unit 11 refers to the re-read data table in the same manner as described above, and causes an error factor due to temperature. It is determined that the timing has been resolved, and data supplement processing is started.

As described above, according to the second embodiment, the FE control unit 10 outputs whether the ambient temperature of the disk d is outside the predetermined range as correct / incorrect information, and the BE control unit 11 outputs the storage device 12. If the ambient temperature corresponding to the reproduction data before being stored / saved in the memory is out of the predetermined range and the correct / wrong information is incorrect, the FE control unit 10 is instructed so that the ambient temperature is within the predetermined range. Change the access speed or the number of accesses.
By doing so, it is possible to perform data reading so that reproduction data as correct as possible is stored in the storage device 12 in an environment where an error due to temperature occurs. Thereby, the reproduction data having an error stored in the storage device 12 can be replaced with correct data early and accurately.

Embodiment 3 FIG.
The third embodiment describes a case where whether or not the servo control result when reading data from the disk d is an error is added to correct / incorrect information.
The playback apparatus according to the third embodiment has the same basic configuration as that of the first embodiment, and therefore, in the following description, reference is made to FIG. 1 for the apparatus configuration.

FIG. 9 is a diagram showing data stored in the storage device, FE error information, servo information, and correct / incorrect information in the third embodiment. The servo information is control information such as the data reading position of the disk d and the rotation of the disk d. An error occurs when the servo control is not performed at a predetermined reading position. That is, if there is no error in the servo control result, it is “normal”, and if there is an error, it is “abnormal”.
In the example of FIG. 9, since the servo information is abnormal, a case where an FE error has occurred in data 1 and data 2 in the reproduction data group before being stored in the storage device 12 is shown.
In this case, data is read by accessing the disk d by an access method different from the conventional one so as to improve the servo convergence condition.

  FIG. 10 is a diagram showing a process of supplementing reproduced data with errors with correct data in the third embodiment. In the example of FIG. 10, the servo information becomes abnormal because the servo control result acquired by the FE control unit 10 from the reproduction unit 6 has an error, and thus an FE error has occurred. At this time, the FE control unit 10 notifies the BE control unit 11 that the servo information is abnormal. If the servo information is abnormal, the BE control unit 11 instructs the FE control unit 10 to change the data read operation condition or the servo convergence condition of the disk d from the past. For example, the disk d is temporarily changed to a lower speed rotation than before as a data reading operation condition. Also, the servo convergence condition of the focus servo or tracking servo is changed by a predetermined value from before.

In FIG. 10, when data 1 to 3 are read from the disk d in order, an error has occurred in data 1 to 3 due to an abnormality in servo information. At this time, the BE control unit 11 performs an FE control unit. 10 is changed, and the data read operation condition or servo convergence condition of the disk d is changed. As a result, there is no error in the servo control result from the reading of the data 4, and the correct data 4 is stored and stored in the storage device 12.
At this time, as in the first embodiment, the BE control unit 11 refers to the reread data table, so that the reproduction data with the correct / wrong information is accumulated in the storage device 12 and the reproduced data with the correct / wrong information is correct. It is determined that the accumulated state, that is, the timing at which the error factor in servo control has been eliminated.
Subsequently, the BE control unit 11 instructs the FE control unit 10 to double the access speed to the disk d, and after storing the data 5 requested to be read in the storage device 12, the data 1 Complement processing for ~ 3 is started.
In this way, by changing the data reading operation condition or the servo convergence condition of the disk d, data reading can be performed so that the reproduction data as correct as possible is stored in the storage device 12.

  As described above, according to the third embodiment, the FE control unit 10 outputs whether or not the servo control result in reading data from the disk d is an error, and the BE control unit 11 includes the storage device. When the servo control result corresponding to the reproduction data before storage / storage in 12 is an error and the correct / wrong information is incorrect, the FE control unit 10 is instructed to read the data on the disk d so that the servo control result error is eliminated. Change the condition or servo convergence condition. By doing so, it is possible to read data so that the reproduction data as correct as possible is stored in the storage device 12 in an environment where an error of the servo control result occurs. Thereby, the reproduction data having an error stored in the storage device 12 can be replaced with correct data early and accurately.

Note that the error factor elimination timing may be determined using both the ambient temperature shown in the second embodiment and the servo control shown in the third embodiment as correct / incorrect information. In this case, a priority order may be given to the factors of temperature and servo control, and the access method to the disk d may be changed from before according to this priority order. For example, even if the temperature is outside a predetermined range, the servo control result is considered to cause a data error, and the data reading operation condition or the servo convergence condition of the disk d is changed from before.
In this way, data reading can be performed so that the correct reproduction data is stored in the storage device 12 as much as possible.

Embodiment 4 FIG.
In the fourth embodiment, a case where whether or not the servo control result when reading data from the disk d is an error is stored in the reread data table will be described.
Note that the playback apparatus according to the fourth embodiment has the same basic configuration as that of the first embodiment, and therefore, in the following description, refer to FIG. 1 for the apparatus configuration.

  FIG. 11 is a diagram illustrating an example of a reread data table according to the fourth embodiment. The servo indicates whether or not the servo control result is an error in association with the read address of the reproduction data in which the error information is incorrect. Saving information. FIG. 11 shows that the servo information of the data of the read addresses AAA and BBB is abnormal, and the servo control result when reading from the disk d is an error. In addition, the data of the read address CCC has error information for other reasons. These data are stored in the storage device 12.

The BE control unit 11 refers to the re-read data table, and if the correct / incorrect information is an error due to a servo control result error, instructs the FE control unit 10 before re-reading the data of the read addresses AAA and BBB, The access method to the disk d is changed to a method different from the conventional method so that the servo convergence condition is improved. For example, as in the third embodiment, the disk d is temporarily changed to a lower speed rotation than before as the data reading operation condition. Also, the servo convergence condition of the focus servo or tracking servo is changed by a predetermined value from before.
As described above, rereading is performed by temporarily improving the data reading performance (playability performance) from the disk d by performing rereading control according to the cause of the data error for each address at which rereading is performed. It is possible to reduce the probability of occurrence of errors in the data.

As described above, in the fourth embodiment, the storage device 12 stores, in the reread data table, the read address from the disk d and the presence or absence of an error in the servo control result in the read for the reproduction data whose error information is incorrect. When the BE control unit 11 refers to the reread data table and the correct / wrong information is an error due to an error in the servo control result, the BE control unit 11 instructs the FE control unit 10 to specify the data read operation condition or servo convergence condition of the disk d. The read address data stored in the reread data table is read from the disk d and reproduced, and the correct / incorrect information stored and stored in the storage device 12 is replaced with the correct reproduced data. .
Thus, when the error factor of the data to be read again is an abnormality in the servo information, it is possible to suppress the occurrence of errors in the data that has been read again by performing read control to eliminate this.

Embodiment 5 FIG.
In the fifth embodiment, a case where the number of rereads performed by rereading data from the disk d is stored in a reread data table will be described.
The playback apparatus according to the fifth embodiment has the same basic configuration as that of the first embodiment, and therefore, in the following description, reference is made to FIG. 1 for the apparatus configuration.

  FIG. 12 is a diagram illustrating an example of a reread data table in the fifth embodiment, and stores the number of rereads in association with the read address of the reproduction data in which the error information is incorrect. In the example of FIG. 12, the read address AAA is reread three times, the read address BBB is reread one time, and the read address CCC is reread one time. These data are stored in the storage device 12.

When the data of the read address stored in the reread data table is read from the disk d, the BE control unit 11 excludes the read address from being read when the reread count is equal to or greater than a predetermined threshold. For example, when the threshold is set to three times, the read address AAA matches the above condition and is excluded from the reread target.
Data at an address with a large number of rereads is determined to be an error due to an internal failure such as a flaw in the disk d, and is not determined to be an error due to an external factor, and is excluded from the reread target addresses.

As described above, in the fifth embodiment, the storage device 12 stores, in the reread data table, the read address from the disk d and the number of rereads that have been reread for the reproduction data with the error information being correct. When the BE control unit 11 reads data at a read address stored in the reread data table from the disk d, if the number of rereads is equal to or greater than a predetermined threshold, the BE control unit 11 excludes the read address from being read.
In this way, only addresses that are highly likely to be complemented with correct data are subject to re-reading, so unnecessary access to the disk d is reduced and more efficient error compensation is possible.

  In addition, with respect to reproduction data with incorrect / wrong information, both the servo information is abnormal and the number of re-reads are stored in the re-read data table, and the fourth embodiment or the implementation is performed during the data complementing process. The processing described in the fifth embodiment may be appropriately executed.

  In the present invention, within the scope of the invention, any combination of each embodiment, any component of each embodiment can be modified, or any component can be omitted in each embodiment. .

  DESCRIPTION OF SYMBOLS 1 Disc reproducing apparatus, 2 Front end part, 3 Back end part, 4 System control part, 5 PU (optical pick-up unit), 6 Reproducing part, 7 Disk drive part, 8 Temperature sensor, 9 Vibration sensor, 10 FE (Front end) ) Control unit, 11 BE (back end) control unit, 12 storage device, 13 output unit.

Claims (7)

A front-end control unit that controls reproduction of data stored in a storage medium, an accumulation device that accumulates and stores reproduction data reproduced from the storage medium, and reads out and outputs the reproduction data stored in the accumulation device In a playback device including a back-end control unit,
The front end control unit outputs an error correction result as correct / incorrect information of the reproduction data,
The storage device stores and stores the reproduction data in association with the correct / incorrect information from the front-end control unit, and re-reads the read address of the storage medium for the reproduction data having the error information. Save to
The back-end control unit instructs the front-end control unit when the reproduction data with the correct / wrong information is accumulated after the reproduction data with the incorrect / wrong information is accumulated in the storage device. Read address data stored in a read data table is read from the storage medium and played back, and the correct / incorrect information stored / stored in the storage device is replaced with the correct playback data. A playback device.   The back-end control unit instructs the front-end control unit to store the reproduction data in which the correct / incorrect information is correct after the correct / incorrect information is stored in the storage device. 2. The reproducing apparatus according to claim 1, wherein a method of accessing the medium is changed from before.   The playback apparatus according to claim 2, wherein the back-end control unit instructs the front-end control unit to increase the access speed to the storage medium. The front end control unit outputs whether the ambient temperature of the recording medium is outside a predetermined range as the correct / incorrect information,
The back-end control unit instructs the front-end control unit when the ambient temperature corresponding to the reproduction data before being stored / stored in the storage device is outside the predetermined range and the correct / incorrect information is incorrect, 2. The reproducing apparatus according to claim 1, wherein the access speed or the number of accesses to the storage medium is changed from before so that the ambient temperature falls within the predetermined range. The front end control unit outputs whether the servo control result in reading data from the storage medium is an error or not as the correct / incorrect information,
The back-end control unit instructs the front-end control unit to instruct the servo control when the servo control result corresponding to the reproduction data before being stored / saved in the storage device is an error and the correct / incorrect information is incorrect. 2. The reproducing apparatus according to claim 1, wherein a data read operation condition or a servo convergence condition of the storage medium is changed from the past so as to eliminate a result error. The storage device stores the read address from the storage medium and the presence or absence of an error in the servo control result in reading in the read-out data table for the reproduction data in which the error information is incorrect,
The back-end control unit refers to the re-read data table, and if the correct / incorrect information is an error due to an error in the servo control result, instructs the front-end control unit to read the data read operation condition of the storage medium or The servo convergence condition is changed from before, the read address data stored in the reread data table is read from the storage medium and played back, and the correct / incorrect information stored and stored in the storage device is the error playback data. 2. The playback apparatus according to claim 1, wherein the correct / incorrect information is replaced with correct playback data. The storage device stores the read address from the storage medium and the number of rereads that have been read again in the reread data table for the reproduction data in which the correct / wrong information is incorrect,
When the back-end control unit reads the read address data stored in the re-read data table from the storage medium and the re-read count is equal to or greater than a predetermined threshold, the back-end control unit reads the read address. The reproducing apparatus according to claim 1, wherein the reproducing apparatus is excluded from the above.

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