JP2005310268A - Information recording medium reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording medium reproducing device capable of reproducing data without breaking it off by lessening a data amount treated by retry processing at the time of errors, and reducing a processing amount of data transfer of a control means. <P>SOLUTION: The information recording medium reproducing device lessens a data amount treated by one data transfer in retry processing at the time of erroneous reading, and performs the retry processing intensively to the data with errors, and thereby reduces the processing amount of the data transfer in a system controller. Since the number of times for the retry processing can be secured, the video and music data can be reproduced without break-off. On the other hand, in a normal data transfer processing, the video and music data are increased, and thereby the processing amount of the data transfer in the system controller is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information recording medium playback apparatus, and in particular, information applied when playing back digital data such as video and music stored on an optical disk medium such as a DVD (Digital Versatile Disk) and a CD (Compact Disk). The present invention relates to a recording medium playback apparatus.

  The information recording medium playback apparatus shown in FIG. 7 prevents an optical disc reading processing block 701 that reads digital data such as video and music recorded on an optical disc such as a DVD or CD, and video / music data recorded on the optical disc from being interrupted. A track buffer memory 702 for pre-reading and storing data, a decoding processing block 703 for decoding compressed video and music data, the optical disk reading processing block 701, the track buffer memory 702, and the decoding processing block 703 A system controller 704 for controlling is provided.

  When playing back video and music data recorded on the optical disc, the video and music data is read by the optical disc reading processing block 701 and temporarily stored in the track buffer memory 702. Hereinafter, this process is referred to as a data transfer process. Thereafter, it is transferred to the decoding processing block 703 for decoding, and video and music signals are output.

  Here, when the optical disk reading processing block 701 detects an error that cannot be corrected, a retry process for reading data from the optical disk again is performed by an instruction from the system controller 704. The retry process is repeated until the error can be corrected, but it must be completed before the video and music data in the track buffer memory 702 that has been pre-read is exhausted. If the retry process cannot be completed, the retry process is terminated, and the data transfer process of the next sector address is performed without the data transfer process being normally terminated. Therefore, the video and music data are interrupted. Therefore, it is necessary to perform more of the retry processing within a limited time.

When the video and music data are reproduced so as not to be interrupted, the retry process is performed within a limited time. The number of times that the retry process can be performed depends on the transfer rate of the video and music data to be reproduced. Therefore, the number of times of retry processing relating to the video and music data having a high transfer rate is reduced, and conversely, the number of times of retry processing relating to data having a low transfer rate or computer data recorded on an optical disc is increased. (For example, Patent Document 1).
JP 2001-155445 A (first page, FIG. 1)

  On the other hand, when the sector addresses of the video and music data to be transferred to the track buffer memory 702 are continuously recorded, the data transfer for transferring the video and music data stored on the optical disk to the track buffer memory 702 By increasing the number of sectors handled in one process, the processing amount of the data transfer per sector in the system controller 704 is reduced, but the amount of video and music data handled in the retry process is reduced during the retry process. Therefore, the processing amount of the data transfer per sector in the system controller 704 increases. For this reason, if the number of sectors handled in the data transfer process is set to be large, the amount of data transfer in the system controller 704 during normal reproduction is reduced. For example, the optical disk has scratches or dust. When an error that cannot be corrected in the optical disk read processing block 701 occurs, the amount of data handled in the retry process at the time of an error in the system controller 704 is large, so that the video and music data may be interrupted during the retry process. . On the other hand, in order to prevent the video and music data from being interrupted when an error that cannot be corrected occurs, when the number of sectors handled in the data transfer process is set to be small, There is a problem that the processing amount of data transfer increases.

  The present invention has been made in order to solve the above-described problem. The data amount handled in the retry processing at the time of error can be reduced so as not to interrupt the data, and the data transfer processing amount of the control means can be reduced. It is an object of the present invention to provide an information recording medium reproducing device that can be reduced.

  In order to solve the above problem, an information recording medium reproducing apparatus according to claim 1 of the present invention includes a recording medium reading processing block for reading digital data recorded on the information recording medium, and the digital data recorded on the information recording medium. Storage means for storing the pre-read digital data to prevent interruption during reproduction, a decoding processing block for decoding the compressed digital data, and a control means for controlling the entire apparatus, When performing data transfer processing for transferring data from the recording medium reading processing block to the storage means, an information recording medium playback apparatus that performs retry processing for data that could not be error-corrected is handled in one data transfer processing. A data amount change determination processing block for determining whether or not to change the data amount; It is characterized in that a data amount changing processing block for changing the amount of data handled by the determination of the serial data amount change decision block by the data transfer process once.

  An information recording medium reproducing apparatus according to claim 2 of the present invention is the information recording medium reproducing apparatus according to claim 1, wherein the control means includes an operation clock of the control means, a capacity of the storage means, Based on the maximum data transfer rate, the recording medium reading processing block, and the number of times of the retry processing, a maximum value of the data amount handled in one data transfer processing is determined, and the recording medium reading processing block; The minimum value of the amount of data handled in one data transfer process is determined based on the operation clock of the control means and the maximum data transfer rate.

  An information recording medium reproducing device according to claim 3 of the present invention is the information recording medium reproducing device according to claim 2, wherein the data amount change processing block is the data transfer processing when performing the retry processing. If the amount of data handled once is reduced to 1 / n (n is a natural number) or the minimum value, and the retry process is not performed, the amount of data handled in the data transfer process is increased to n times or the maximum value It is characterized by making it.

  According to a fourth aspect of the present invention, there is provided an information recording medium reproducing device according to the first aspect, wherein the retry processing flag indicating that the retry processing is being executed is detected in the information recording medium reproducing device according to the first aspect. A retry processing flag monitoring block for changing the priority of the control means, and during execution of the retry processing, the priority of control processing other than the retry processing in the control means is lowered, and the retry processing is completed. Control processing other than the retry processing is performed.

  According to the information recording medium reproducing apparatus of the first aspect of the present invention, the recording medium reading processing block for reading the digital data recorded on the information recording medium and the digital data recorded on the information recording medium are interrupted during reproduction. In order to prevent this, the storage unit stores the pre-read digital data, a decoding processing block that decodes the compressed digital data, and a control unit that controls the entire apparatus. When performing data transfer processing for transferring data from a read processing block to the storage means, the amount of data handled in one data transfer processing is changed in an information recording medium playback device that performs retry processing for data that could not be error-corrected A data amount change determination processing block for determining whether or not the data amount change Since the data amount change processing block for changing the data amount handled in one data transfer process according to the determination of the processing block is provided, the data amount handled in one data transfer process is reduced in the retry process at the time of reading error. In addition, the retry processing can be performed intensively on data with errors, and the data can be reproduced without interruption. Further, in the normal data transfer process, the data amount can be reduced by increasing the data amount, and the data to be transferred even if the performance of the control unit is low. There is an effect that the amount can be secured.

  According to the information recording medium reproducing apparatus of claim 2, in the information recording medium reproducing apparatus of claim 1, the control means includes an operation clock of the control means, a capacity of the storage means, and data The maximum transfer rate, the recording medium reading processing block, and the number of times of the retry processing, determine the maximum value of the amount of data handled in one data transfer processing, the recording medium reading processing block, Since the minimum value of the amount of data handled in one data transfer process is determined based on the operation clock of the control means and the maximum data transfer rate, the data to be reproduced can be retried without interruption. Can be performed intensively, and the amount of data transfer in the control means can be reduced.

  According to an information recording medium playback device of a third aspect of the present invention, in the information recording medium playback device according to the second aspect, the data amount change processing block performs the data transfer when performing the retry processing. When the amount of data handled in the process is reduced to 1 / n (n is a natural number) or the minimum value and the retry process is not performed, the data amount processed in the data transfer process is multiplied by n or the maximum value Therefore, the number of retries can be ensured and the amount of data transfer in the control means can be reduced.

  According to an information recording medium reproducing apparatus of claim 4 of the present invention, in the information recording medium reproducing apparatus of claim 1, whether or not a retry process flag indicating that the retry process is being executed is detected. And a retry process flag monitoring block for changing the priority of the control means, and during execution of the retry process, the priority of the control process other than the retry process in the control means is lowered, and the retry process ends. Since the control process other than the retry process is performed after this, the number of times of performing the retry process can be increased.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
The information recording medium playback apparatus according to Embodiment 1 of the present invention will be described below. In the first embodiment, n is set to 2 in claim 3 to simplify the description.

FIG. 1 is a block diagram showing the configuration of the information recording medium reproducing apparatus according to the first embodiment.
The information recording medium playback apparatus shown in FIG. 1 pre-reads data in order to prevent an optical disc reading processing block 101 that reads digital data such as video and music recorded on the optical disc and video / music data recorded on the optical disc from being interrupted. A track buffer memory 102 for storing, a decoding processing block 103 for decoding compressed video and music data, a system controller 104 for controlling the optical disk reading processing block 101, the track buffer memory 102 and the decoding processing block; It is provided.

  A track for pre-reading and storing the video and music data by the optical disk reading processing block 101 so that the video and music data are not interrupted when reproducing the video and music data recorded on an optical disk such as a DVD or CD. Transfer to buffer memory 102.

  When the optical disk reading processing block 101 detects an error while reading the data on the optical disk, retrying to read the video and music data from the disk again until the error can be corrected or the data in the track buffer memory 102 is exhausted. Repeat the process. A track buffer memory 102 is a memory for pre-reading and storing the video and music data so that the video and music data are not interrupted during the processing.

  If the data is compressed after the data is transferred to the track buffer memory 102, the data in the track buffer memory 102 is decoded by the decoding processing block 103 and output as a video or music signal.

  As control by the system controller 104, first, the directory and file information of the data recorded on the optical disc is read, and the head sector address and the end sector address of the video and music data are acquired. However, the information differs depending on the type of the video and music data.

  Thereafter, a sector address corresponding to the file to be reproduced is designated, and a data transfer command is issued to the optical disk reading processing block 101. After that, if the data transfer process for transferring the data recorded on the optical disk to the track buffer memory 102 is normally completed, the sector address of the subsequent video and music data not yet read is designated, and the video, The music data is transferred to the track buffer memory 102. Usually, the data transfer process is repeated up to the end sector address of the video and music data while being decoded by the decode processing block 103.

  If the result from the optical disk reading processing block 101 indicates that the error cannot be corrected, a retry process for issuing a transfer instruction to the same sector address again under the control of the system controller 104 is required. While the retry process is being performed, the video and music data cannot be newly transferred to the track buffer memory 102 because the data transfer process has not been completed normally. Therefore, the pre-read video and music data in the track buffer memory 102 are consumed, and the decode processing block 103 continues the reproduction process. Therefore, it is necessary to finish the retry process until there is no video or music data in the track buffer memory 102. If the retry process cannot be completed, the retry process is forcibly terminated and the next sector address data is read to reproduce the subsequent data, so that the video and music data are interrupted. Therefore, it is necessary to perform more of the retry processing within a limited time.

  FIG. 2 is a processing block diagram in the system controller 104 in the information recording medium reproducing apparatus according to the first embodiment of the present invention. The system controller 104 in FIG. 2 includes an optical disk reading process control block 204 that controls the optical disk reading process, a track buffer memory control block 205 that manages the track buffer memory 102, and a decoding process control block 206 that controls the decoding process. In the present invention, the data transfer control processing block 203 that controls the data transfer processing includes a sector number change determination processing block 201 that determines whether or not to change the number of sectors in the data transfer processing, and a sector number change determination processing block 203. A sector number change processing block 202 for changing the number of sectors based on the determined result, and further, according to the presence or absence of detection of a retry process flag indicating that the retry process is being executed, A retry processing flag monitoring block 207 for changing the priority is newly added.

  Next, the data transfer operation from the optical disk reading processing block to the track buffer memory in the information recording medium device according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a flowchart showing data transfer control from the optical disk reading processing block 101 to the track buffer memory 102.

  The data transfer control processing block 203 is controlled by an optical disc reading processing control block 204 in the system controller 104.

  The data transfer control processing block 203 first sets the number of sectors to the maximum value of the number of sectors handled in one data transfer process, and sets the sector address to the top sector address of the data to be reproduced (step S301). Then, the optical disc reading processing block 101 reads the video and music data from the optical disc, and performs a transfer process for transferring the read data to the track buffer memory 102 (step S302). Next, it is confirmed whether or not the transfer process in step S302 has been completed normally (step S303). In step S303, when the data transfer process is normally completed, the retry process flag is set to confirm whether the data transfer process performed in step S302 is performed after the retry process. (Step S304). If the retry processing flag is not set in step S304, the sector number change determination processing block 201 determines that the number of sectors is to be increased, and the sector number change processing block 202 determines the current number of sectors to be sent in one data transfer process. Double it (step S305). However, when the number of sectors becomes larger than the maximum value set in step S301 in step S305, the maximum value is set as the number of sectors.

  If the retry process flag is set in step S304, the retry process flag is cleared (step S306), and the process of step S307 is performed. If the retry processing flag is set in step S304, that is, if the video and music data can be read normally by the retry processing, the error has been corrected, or the error still remains where the number of sectors is reduced. Therefore, after the retry process is completed, the number of sectors to be sent in one data transfer process is left as it is. If the normal process continues twice or more after the retry process, the retry process flag is OFF in step S304, so the number of sectors sent in one data transfer process is doubled in step S305.

  Next, the number of sectors sent by one data transfer process is added to the sector address (step S307). Then, it is confirmed whether or not the data transfer process has been completed to the end of the video or music data (step S308). If the data transfer process has been completed to the end, the data transfer control processing block 203 ends the process and ends to the end. If not, the process returns to step S302.

  If the data transfer process does not end normally due to an error in step S303, a retry process flag is set (step S309). If the data transfer process does not end normally due to an error in step S303, the sector number change determination processing block 201 determines that the number of sectors is to be decreased, and the sector number change processing block 202 determines that the sector The number is halved (step S310). However, when the number of sectors in step S310 is smaller than the set minimum value, the minimum value is set as the number of sectors.

  FIG. 4 is a graph showing changes in the transfer rate of the data transfer control processing block according to the increase / decrease of the number of sectors and the performance of the apparatus in the information recording medium reproducing apparatus according to the first embodiment.

In the figure, the vertical axis represents the transfer rate of the data transfer control processing block, and the horizontal axis represents time.
402 is the transfer rate of the data transfer control processing block, 401 is the transfer rate of the data transfer control processing block when the number of sectors handled in one data transfer process is increased compared to the transfer rate 402, and 403 is the transfer rate. This is the transfer rate of the data transfer control processing block when the number of sectors handled in one data transfer process is reduced compared to 402. Reference numeral 404 denotes a transfer rate requested by the data.

  Further, it is assumed that an error that cannot be corrected occurs before and after the time 405 and the retry process is performed.

  At the transfer rates 401, 402, and 403, the transfer rate is lower than the transfer rate 404 requested by the data due to the retry processing. The data stored in the track buffer memory 102 is consumed in proportion to the time product 406, and the data is supplied to the decoding processing block 103.

  Therefore, the transfer rate 401 is increased by increasing the number of sectors handled in one data transfer process, and it can be seen that the maximum value of the number of sectors is determined by the track buffer memory 102. Further, since the maximum value of the number of sectors is also determined by the processing speed of the data transfer processing for performing the retry processing shown in FIG. 3, the performance of the system controller 104 and the optical disk reading processing block 101 is If it is higher, the transfer rate 402 of the data transfer control processing block is increased, and the transfer rate 402 is shifted upward while remaining parallel to the vertical axis. If the transfer rate 402 is shifted upward, it is not necessary to consume data stored in the track buffer memory 102, so that the maximum number of sectors handled in one data transfer process is further increased. On the contrary, if the performance of the system controller 104 and the optical disk reading processing block 101 is lowered, the transfer rate 402 of the data transfer control processing block decreases, and the transfer rate 402 decreases in a state parallel to the vertical axis. Since the data stored in the track buffer memory 102 is consumed accordingly, the maximum number of sectors handled in one data transfer process is reduced.

  The information recording medium playback apparatus of the present invention provides a maximum value and a minimum value of the number of sectors handled in one data transfer process, so that the video / music data is insufficient for the transfer rate requested by the data within a range where the video / music data is not interrupted. This is an approach of saving the consumption of the track buffer memory 102 by controlling the product 406 of the data transfer rate and its period to be small.

Next, the maximum value and the minimum value of the number of sectors handled in one data transfer process will be described.
The maximum value and the minimum value of the number of sectors handled in one data transfer process are preferably n-th power values in order to reduce the calculation process required for changing the number of sectors.

上記の（式１）により、一度のデータ転送処理で扱うセクタ数の最大値、最小値を設定しておく。 Number of sectors handled in one data transfer process when the product of the data transfer control processing time and the transfer rate of the video and music data equals the capacity of the track buffer memory when there is an uncorrectable error The number of sectors when the data transfer rate of the data transfer control process when there is no error and the transfer rate of the video and music data is the same is the minimum value of the number of sectors handled in one data transfer process. The following (formula 1) can be shown.

The maximum value and the minimum value of the number of sectors handled in one data transfer process are set by the above (Formula 1).

In this way, by setting the maximum value and the minimum value of the number of sectors handled in one data transfer process, according to the number of consecutive retry processes, one transfer is performed in the data transfer process in the system controller. By reducing the number of sectors, for example, by keeping the total amount of retry processing at the normal retry processing amount of 2 times, and securing the number of retry processings twice or more, video and music data are not interrupted. It is possible to play back. The expected value R of the number of retry processes when the amount of computation of the conventional retry process amount is two is expressed by the following (Equation 2).

  For example, when the maximum value and the minimum value of the number of sectors are powers of 2, the maximum value of the number of sectors handled in one data transfer process is 128, and the minimum value is 2, the total processing of the retry process in the system controller 104 The retry process can be performed six times while maintaining the amount of the conventional retry process amount twice.

  In general, the ratio of error data that cannot be error-corrected and the total data of the video and music is much lower for error data, so the number of sectors handled in a single data transfer process is immediately after the start of the data transfer process. When an error that cannot be corrected occurs, the maximum value is reached, and the number of sectors handled in one data transfer process approaches the minimum value as the number of retry processes increases continuously. Since the error that occurred in the data transfer process has been corrected by the retry process, the number of sectors handled in one data transfer process approaches the maximum value when normal transfer is performed. If the error cannot be corrected even after a predetermined number of retries, the number of sectors handled in the transfer process is returned before the retry process.

FIG. 5 is a diagram for explaining a retry process and a conventional retry process in the information recording medium reproducing apparatus according to the first embodiment.
501 shown in FIG. 5 indicates a file for which the start and end sector addresses of the video and image data are required. The video and image data of 640 sectors in which sector addresses are continuously recorded are stored once. In this data transfer process, the number of sectors to be sent is 64, and the data transfer process is performed 10 times. 502 is an enlarged view of the sector portion to be subjected to the third data transfer process of the video and image data, and includes an error that could not be corrected.

  In the prior art and the retry processing for the error in the present invention, it is assumed that the data transfer processing is normally completed by three times of the retry processing. In the retry process according to the present invention, the number of sectors to be sent in one data transfer process is halved and decreased, and after the data transfer process is normally completed, the number of sectors to be sent in one data transfer process is 2 It is doubled and increases.

  As described above, in the present invention, even when the number of sectors to be sent in one data transfer process is controlled to be read, the number of sectors to be sent in one data transfer process is reduced according to the number of consecutive retry processes. In the prior art, the retry processing of 192 sectors performed three times in the prior art can be reduced to 56 sectors, so that more retry processing can be performed.

  FIG. 6 shows a change in the transfer rate of the data transfer control processing block by the retry processing flag monitoring block 207 in the information recording medium reproducing apparatus according to the first embodiment. In FIG. 6, the vertical axis represents the transfer rate of the data transfer control processing block, and the horizontal axis represents time. Reference numeral 601 denotes a transfer rate of the data transfer control processing block, and reference numeral 602 denotes a transfer rate required for the video and music data. Further, it is assumed that an error that cannot be corrected occurs before and after time 605, the retry process is performed, and the retry process is completed at time 606.

  When the retry process is performed, the transfer rate 601 of the data transfer control process block is lowered. Therefore, the retry processing flag monitoring block 207 lowers the priority of processing other than the retry processing by the system controller 104 by detecting that the retry processing is being executed by the retry processing flag, and the retry processing is performed. By performing processing other than the retry processing after the processing is completed, the processing capability of the system controller 104 during the retry is increased, and the transfer rate 601 during the retry processing is increased as indicated by an arrow 604, and an arrow 603 indicates As shown, the transfer rate 601 of the data transfer control processing block after the retry process is lowered.

  As a result, since the consumption of the track buffer memory 102 can be suppressed, it is possible to increase the number of times the retry process is performed.

  The information recording medium reproducing apparatus according to Embodiment 1 of the present invention as described above reduces the amount of data handled in one data transfer process in the retry process performed at the time of a read error, and concentrates on data with an error. By performing retry processing, even if an error occurs when the data transfer rate is high, the number of retry processing can be ensured and data such as video and music can be reproduced without interruption.

  Further, in normal data transfer processing, the amount of data handled in one data transfer processing is increased to reduce the data transfer processing amount in the system controller. Therefore, even if the performance of the system controller is low, data is transferred. The amount of data can be secured.

  The present invention is useful when playing back video or music data recorded on an optical disc or during high-speed playback. It can also be used for high-speed data read from external recording media.

Information recording medium reproducing apparatus according to Embodiment 1 of the present invention System controller processing block diagram Flowchart of data transfer control processing block for performing retry processing The figure which shows the change of the transfer rate of the data transfer control processing block by increase / decrease in the number of sectors and the performance of the apparatus The figure which shows the number of sectors at the time of retry processing of the prior art and the present invention The figure which shows the change of the transfer rate of the data transfer control processing block by the retry processing flag monitoring block The figure which shows the conventional information recording medium reproducing | regenerating apparatus

Explanation of symbols

101, 701 Optical disk reading processing block 102, 702 Track buffer memory 103, 703 Decoding processing block 104, 704 System controller 201 Sector number change determination processing block 202 Sector number change processing block 203 Data transfer control processing block 204 Optical disk reading processing control block 205 Track buffer memory control block 206 Decode processing control block 207 Retry processing flag monitoring block 401 Transfer rate 402 of data transfer control processing block when the number of sectors handled in one data transfer processing is increased Transfer rate 403 of data transfer control processing block Transfer rate 404 for data transfer control processing when the number of sectors handled in one data transfer processing is reduced Transfer rate 405 required for data The point where the error occurred 406 The product of the data transfer rate and the time that is insufficient with respect to the transfer rate requested by the data 501 The file where the start and end sector addresses of the video and image data are required 502 Error correction processing can be performed No sector 601 Data transfer processing block transfer rate 602 Data requested transfer rate 603 Arrow for indicating a lower transfer rate by the retry processing flag monitoring block 604 Arrow for indicating a higher transfer rate by the retry processing flag monitoring block

Claims (4)

A recording medium reading processing block for reading the digital data recorded on the information recording medium, a storage means for storing the pre-read digital data to prevent the digital data recorded on the information recording medium from being interrupted during reproduction, and compression A decoding processing block for decoding the digital data and a control means for controlling the entire apparatus, and when performing data transfer processing for transferring the data of the information recording medium from the recording medium reading processing block to the storage means In the information recording medium reproducing apparatus that performs retry processing for data that could not be error-corrected,
A data amount change determination processing block for determining whether or not to change the data amount handled in one data transfer process;
A data amount change processing block that changes the data amount handled in one data transfer process according to the determination of the data amount change determination processing block;
An information recording medium reproducing apparatus characterized by the above. The information recording medium playback device according to claim 1,
The control means includes
Data handled in one data transfer process based on the operation clock of the control means, the capacity of the storage means, the maximum data transfer rate, the recording medium reading processing block, and the number of retry processes Determine the maximum amount,
Based on the recording medium reading processing block, the operation clock of the control means, and the maximum transfer rate of data, the minimum value of the data amount handled in one data transfer process is determined.
An information recording medium reproducing apparatus characterized by the above. The information recording medium playback device according to claim 2,
The data amount change processing block includes:
When the retry process is performed, the amount of data handled in the data transfer process is reduced to 1 / n (n is a natural number) or the minimum value, and when the retry process is not performed, the data transfer process is performed once. Increasing the amount of data to n times or the maximum value,
An information recording medium reproducing apparatus characterized by the above. The information recording medium playback device according to claim 1,
A retry processing flag monitoring block for changing the priority of the control means according to the presence or absence of detection of a retry processing flag indicating that the retry processing is being executed;
During execution of the retry process, the priority of the control process other than the retry process in the control unit is lowered, and after the retry process is completed, a control process other than the retry process is performed.
An information recording medium reproducing apparatus characterized by the above.

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