JP2011138576A - Information reproducing device and method of reproducing information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for optimally rearranging retry conditions with a smaller number of retries, and to provide a method of optimally rearranging the order of selecting the retry conditions, in the same way as when holding data having been read by the previous retry. <P>SOLUTION: Results of error correction or error detection are obtained as a result of reading information based on each of settings, every time read is retried. The read retry conditions are ranked based on the result after success of read retry, the order of selecting retry conditions is rearranged so as to preferentially select the more satisfactory condition. A data storage region for read retry is provided in a buffer memory in addition to a data region for normal playback. Error correction and error detection during read retry are performed on the data storage region for retry, while, when reading in retry setting is completed, a part of data without error is duplicated in the normal playback region, data without error are accumulated in the normal playback region. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mainly relates to data reading technology from a data storage medium, and more particularly to retry reproduction processing.

  Background art includes, for example, Patent Document 1 (Japanese Patent Laid-Open No. 11-66763) and Patent Document 2 (2001-307434). The problem of the summary of Patent Document 1 is described as “providing a data disk reading method and a recording medium recording a reading procedure capable of reducing the number of repetitions of retry processing”. “When a read retry process is executed when an error occurs at an arbitrary read address of a data disk, the presence or absence of a read retry record at the read address is searched. A read retry process is executed based on a predetermined parameter to be set and, if present, one of a plurality of parameters recorded corresponding to the read retry recording is adopted in a predetermined order and read retry is performed. Execute processing and return to each of multiple parameters. Grant number of successful Lee, has been described as the number of successes of each of retries of the plurality of parameters interchanged adoption order such that the descending order ".

  In addition, the problem of the summary of Patent Document 2 describes that “when data is reproduced and rewritten for an area where an uncorrectable error has occurred, the error rate is reliably improved”. “Reproduction data is obtained by reproducing a part of the recording medium at a speed higher than the standard speed, and error correction of the reproduction data is performed using at least two types of error correction codes, and information on the success or failure of error correction is stored. When there is reproduction data that could not be corrected, the portion of the recording medium is reproduced again at high speed to obtain reproduction data, and the reproduction data is rewritten based on the stored information regarding the success or failure of error correction. Yes.

Japanese Patent Laid-Open No. 11-66763 JP 2001-307434 A

  In reproduction processing of data recording media such as CD (Compact Disc), DVD (Digital Versatile Disc), and BD (Blu-ray Disc), a data pattern recorded on the media is picked up by a pickup device (if it is a magnetic recording medium). Digital data is obtained based on an electrical signal obtained by scanning with a magnetic head. In many cases, an error correction code is added to the recorded digital data so that the data error that occurs in this process can be corrected. Performs a process called a read retry process in which the reproduction process of the same part is performed until the part can be restored. However, especially in applications where moving images and audio are reproduced from these data recording media, if the number of read retries increases, the required data transfer rate cannot be ensured, resulting in disturbance of images and audio. Successful read retries are required with a small number of times.

  On the other hand, in Patent Document 1, when an error occurs at an arbitrary read address of a data disk, when the read retry process is executed, the presence or absence of read retry recording at the read address is searched, and the read retry at the read address is searched. If there is no recording, the read retry process is executed based on a predetermined parameter set in advance. If it exists, one of a plurality of parameters recorded corresponding to the read retry recording is set to a predetermined value. By adopting in order and executing read retry processing, giving the number of successful retry to each of the plurality of parameters, by changing the order of adoption so that the number of successful retry of each of the plurality of parameters is in the descending order, Describes an invention that reduces the number of retries to success To have.

  Another invention relating to this problem is described in Patent Document 2. Patent Document 2 describes a method and apparatus for efficiently performing a read retry process. According to this, when a part of the recording medium is reproduced at a speed higher than the standard speed to obtain reproduction data, information regarding the success or failure of error correction is stored, and there is reproduction data that could not be corrected, By replaying a portion of the recording medium again to obtain playback data, and rewriting the playback data based on the stored information regarding the success or failure of the error correction, the data is played back again for the area where an uncorrectable error has occurred. The error rate is improved when rewriting.

  However, in the method described in Patent Document 1, the order of adoption is rearranged so that the number of successful retries is in descending order. In this way, in order to rearrange in the optimum order, many retries are performed. Processing must be done.

  Further, in the method described in Patent Document 2, since data is retained for reading until the previous retry, in order to succeed in retry reproduction with a certain retry setting, even data that has failed to be read with all the previous retry settings is read. You just have to succeed. For this reason, the last setting which succeeded in retry reproduction | regeneration is not necessarily the best. Therefore, it cannot be combined with the process of rearranging in the optimal order according to the number of successful retries as in the method described in Patent Document 1.

  On the other hand, in the present invention, it is a first object of the present invention to provide a method for realizing optimal rearrangement of retry conditions with a smaller number of retry processes than the method described in Patent Document 1. Furthermore, it is a second problem to provide a method capable of rearranging the adoption order of retry settings in an optimum order in the retry process for holding data for reading until the previous retry.

  The above problem can be solved by the invention described in the claims as an example.

  According to the present invention, optimal rearrangement of retry conditions can be realized with a smaller number of retry processes. In addition, according to the present invention, it is possible to provide a method capable of rearranging the adoption order of retry settings in an optimal order while obtaining the effect of retaining data that has been successfully read up to the previous retry.

It is a block diagram of the drive apparatus of this invention. It is the figure which showed the sector structure. It is a figure showing the addition format of the error correction code. It is an example of a retry setting list. It is an example of an error correction result flag table. It is an example of a retry list reference order table. 3 is an example of data storage processing in the first embodiment. This is a retry order update process in the first embodiment. 6 is a configuration example of a memory controller in Embodiment 2. 10 is an example of data storage processing in the second embodiment. 12 is an example of a retry order update process in the second embodiment.

  Embodiments of an information reproducing apparatus according to the present invention will be described below. In an example of the embodiment, when each retry reproduction is performed, an error correction result or an error detection result obtained as a result of reading with each setting is obtained, and after successful retry reproduction, the superiority or inferiority of each retry reproduction condition is determined based on the result. The selection order of the retry conditions is rearranged so that the reproduction conditions that are judged to be superior are preferentially selected. Thereby, optimal rearrangement of the retry conditions can be realized with a smaller number of retry processes.

In another example, regarding the data arrangement in the buffer memory, a data storage area for retry reproduction is provided separately from the data area for normal reproduction, and error correction and error detection during retry reproduction are performed in the data storage area for retry. To do. As a result, it is possible to obtain an error correction result and an error detection result that can be used as a superior / inferior index of the retry reproduction condition without being influenced by the result of the previous retry process. On the other hand, there is provided means for copying only the data portion in which the error in the retry setting is completed and the error is eliminated to the normal reproduction area. As a result, it is possible to store data having no error in the normal reproduction area.
Furthermore, the selection order of the retry reproduction conditions can be rearranged based on the error correction results and error detection results obtained according to these examples.

  Examples will be described in detail below.

(Disk data format)
Before explaining the read retry process which is the center of the present invention, the data format of the presupposed disk will be explained.

Basic partial data excluding error correction codes and the like is generated in units of 65536 bytes (32 sectors) of user data, and is generated by the following five procedures.
Generation procedure 1: Add a 4-byte error detection code (EDC) to user data every 2048 bytes (1 sector) Generation procedure 2: Collect 32 pieces of data obtained by generation procedure 1 Generation procedure 3: Arranging in the format of 192 rows x 348 columns represented: Scrambling the data obtained in generation procedure 2: Generation procedure 4: Each of 348 rows for the data obtained in generation procedure 3 In contrast, 32-byte parity is added to 192-byte data in the vertical direction. The data unit to which the parity is added is called an error correction code (ECC). The obtained data has a structure of 224 rows x 348 columns as shown in FIG. This configuration is called an ECC block.
Generation procedure 5: Interleaving is performed on the data obtained in the generation procedure 4. By performing a modulation process on the data thus obtained, data to be recorded on the disc (101) is generated.

On the contrary, the procedure for reproducing the data transferred to the host device (118) from the binarized data discriminated by the binarization discriminating circuit (109) from the reproduction signal read from the disc is as follows.
Playback procedure 1: Demodulate the data read from the disc.
Playback procedure 2: De-interleave ECC block.
Playback procedure 3: Perform error correction. If correction fails, the process proceeds to retry reproduction processing.
Playback procedure 4: The data obtained in the playback procedure 4 is descrambled.
Reproduction procedure 5: Error detection is performed on the data obtained in the reproduction procedure 5. When an error is detected, the process proceeds to retry reproduction processing.
If no error is detected in the reproduction procedure 5, the recorded data can be correctly restored.
The above is the outline of the procedure for generating and reproducing the data format recorded on the disc.

(Configuration of optical disk playback device)
Next, prior to the description of the retry playback process, the premise of the configuration of the optical disc playback apparatus will be described.

FIG. 1 shows a configuration example of an optical disc playback apparatus.
(101) is a disk, (102) is an optical pickup, (103) is a servo signal generation circuit, (104) is a servo compensator, (105) is an equalization circuit 1, (106) is an A / D conversion circuit, 107) is a PLL circuit, (108) is an equalization circuit 2, (109) is a binarization discrimination circuit, (110) is a demodulation circuit, (111) is a memory controller, (112) is a buffer memory, and (113) is Error correction circuit (114) Host interface, (115) Microcomputer interface, (116) Microprocessor, (117) Data memory, (118) Host device, (119) Program memory, (120) A retry setting list, (121) is an error correction result flag table, (122) is a retry list reference order table, and (123) is a retry counter.

  The disc (101) is rotated by a spindle motor (not shown), and a binarization pattern corresponding to recording data is arranged on a spiral track on the recording film. The optical pickup (102) irradiates a laser beam so as to focus on the binarized pattern recorded on the disk (101), and converts it into an electric signal whose amplitude changes depending on the amount of return light.

  In the servo signal generation circuit (103), a focus error signal corresponding to the amount of deviation of the focal position of the laser beam in the vertical direction with respect to the disk surface or the amount of deviation in the radial direction is determined from the electrical signal detected by the optical pickup (102). A servo error signal including a corresponding tracking error signal and a reproduction signal corresponding to the binarized data are obtained. The servo compensator (104) is a digital filter circuit that adjusts the frequency characteristics to stably perform feedback control based on the servo error signal, and this output is built into the optical pickup (102) through a driver circuit (not shown). The tracking actuator and focusing actuator are driven to control the servo error signal to be small.

  The equalization circuit 1 (105) is an analog filter circuit that receives a reproduction signal obtained by the optical pickup and performs waveform equalization so as to be suitable for subsequent processing. The A / D conversion circuit (106) performs sampling and A / D conversion on the reproduction signal waveform-equalized by the equalization circuit 1 (105) at the timing of the clock generated by the PLL circuit (107). The PLL circuit (107) detects the amount of error between the ideal sampling time and the actual sampling time from the reproduced waveform sampled by the A / D conversion circuit (106), and can suppress it. By controlling the oscillation clock of the controlled oscillator, a clock synchronized in phase with the reproduction signal input to the A / D conversion circuit (106) is obtained. The equalization circuit 2 (108) receives the reproduced signal quantized and sampled by the A / D conversion circuit (106) as input, and is suitable for binarized data discrimination using the binarization discrimination circuit (109). It is a digital filter circuit that performs waveform equalization. The binarization discrimination circuit (109) is a circuit for discriminating the binarization pattern recorded on the disc (101) from the output waveform of the equalization circuit 2 (108).

  The demodulating circuit (110) demodulates the data string obtained by the binarization discriminating circuit (109) according to a modulation rule predetermined by the disk standard, and passes through the memory controller (111) to buffer memory (112). The demodulated data is stored in. The error correction circuit (113) performs error correction on the demodulated data stored in the buffer memory (112), overwrites the corrected data on the buffer memory (112), and subsequently decodes the corrected data. Scramble and error detection. The host interface (114) corrects the error data by the error correction circuit (113) and transfers the data determined as having no error data by error detection to the host device (118). The memory controller (111) accesses according to the access priority according to the data storage request and read request to the buffer memory (112) from the demodulation circuit (110), error correction circuit (113), host interface (114), etc. Controls arbitration of rights, generation of address signals to the buffer memory (112), transfer of write enable signals, write data, and read data.

  The microcomputer interface (115) is used for setting functions such as register write from the microprocessor (116) to each function circuit and internal status acquisition including register read from each function circuit to the microprocessor (116). It is an interface circuit. The microprocessor (116) performs software control of the drive device in accordance with the processing program (119) stored in the program memory. The data memory (117) is a rewritable memory element that can be accessed from the microprocessor (116), and is used to store various data that needs to be updated for processing by the microprocessor (116). The data memory (117) may allocate this target area in the buffer memory (112) without being directly connected to the microprocessor as shown in FIG. The program memory (119) is a memory element that stores a processing program of the microprocessor (116). This processing program includes information of the retry setting list (120).

  As described above, an error correction code (ECC) and an error detection code (EDC) are added to the data format of this embodiment. The error correction circuit (113) of the present embodiment performs error correction processing and error detection processing on these, and enables the microprocessor (116) to acquire the following two pieces of information as a result of the correction processing. As acquisition means, it may be displayed in a register or stored in the buffer memory (112).

Error correction result information that can be acquired by the microprocessor (116)-ECC block correction processing, whether ECC was determined to be uncorrectable per block-All errors detected by EDC per block Information Representing Sector Position The retry setting list (120) has a table of setting numbers and various drive parameters corresponding to the setting numbers. In the example shown in Fig. 4, G_FCS, G_TRK, EQ1BST, EQ1FCH, EQ1FCL are Focusing servo gain setting, Tracking servo gain setting, Waveform equalizer 1 boost amount setting, Waveform equalizer 1 High frequency cutoff frequency setting, Waveform Equalizer 1 is a low-frequency cutoff frequency setting, and is an array associated with the setting number.

The error correction result flag table (121) is a table in which flags representing the results of error correction codes or error detection codes at the time of block reproduction are arranged for each retry number. For error correction, the flag may be determined based on whether correction is possible, and for error detection, the flag may be determined based on the presence or absence of an error symbol. In the example shown in FIG. 5, the vertical direction is the number of retries and the horizontal direction is 32 sectors that form one block, and the error detection results EDCNG (I, j) (I is the number of retries, j is the sector number) are arranged in two dimensions. It is an array.
The retry counter (123) is a counter value indicating the number of retries at the reproduction position, and is incremented when the retry reproduction process is unsuccessful, and is reset to 0 when it is successful.

  The retry list reference order table (122) is a table that associates the order in which the retry parameters are executed with the setting number of the retry setting list (120), and the microprocessor (116) fails the retry playback processing and sets the retry counter (123). In addition to updating, the setting number of the retry setting list (120) is searched based on the updated count value and the retry list reference order table (122), the corresponding parameter is set, and retry reproduction is retried. In the example shown in FIG. 6, when the retry counter (123) is 1, the retry setting number 3 is set, and when the retry counter (123) is 2, the retry setting number 5 is set and the retry counter (123) is set. When “3” is set, retry setting number 2 is set.

  It describes below regarding Example 1 of this invention.

(Data storage processing)
FIG. 7 shows the data stored in the buffer memory (112) via the memory controller (111) in the data demodulated by the demodulation circuit (110) according to the present invention, and is processed by the error correction circuit (113) to be the host device (118). 3 illustrates an example of data storage processing until data transfer to the server.

(700) is a read start step. Specifically, the following four steps are further included.
Step 1: Receive a data read request from the host device (118) via the host interface (114) Step 2: In accordance with the data read request, irradiate a designated area on the disk (101) with laser light.
Step 3: The obtained return light is converted into an electrical signal, and after processing from the reproduction signal equalization circuit 1 (105) to the binarization discrimination circuit (109), the mark pattern recorded on the disc (101) Is determined.
Step 4: The obtained data is demodulated by the demodulation circuit (110).

  (701) is a step of storing data in the buffer memory (112). In this embodiment, the data demodulated by the demodulation circuit (110) is stored in the buffer memory (112) while deinterleaving.

  (704) is ECC error correction processing. This process is performed by the error correction circuit (113) based on the data stored in the buffer memory (112). The corrected symbol data is re-stored in the buffer memory (112).

  (705) is a step of obtaining ECC uncorrectable information. More specifically, the microprocessor (116) obtains uncorrectable ECC information as a result of performing ECC correction in the error correction circuit (113).

  (706) is a step of performing error detection processing by EDC. This process is performed by the error correction circuit (113) based on the data stored in the buffer memory (112).

(707) is a step of acquiring a correction result flag (EDC_NG). More specifically, the microprocessor (116) acquires error detection EDC information as a result of performing error detection processing in the error correction circuit (113). If the error detection failure can be substantially ignored, the error detection result in EDC may be adopted, or if the occurrence of error detection omission due to EDC is considered, the correction obtained in step (705) Based on the impossible ECC information, the ECC correction result is also set so that EDC_NG is set to 0 not only when no error is detected by error detection by EDC but also when error correction by ECC is successful. The correction result flag (EDC_NG) may be determined in consideration. That is, according to the example of FIG. 2, regarding the sector formed by the symbol d (0,0) to the symbol d (2051,0), there is no error regarding the error detection result in the EDC for the sector in the meantime. Thus, the condition that EDC_NG = 0 is that no uncorrectable error has occurred in all of ECC (0) to ECC (10) forming the sector, and EDC_NG = 1 is set otherwise. Similarly, regarding the sector formed by symbols d (0,1) to d (2051,1), in addition to the fact that no error has occurred with respect to the error detection result in the sector, ECC (10) to ECC (21) The condition that EDC_NG = 0 is that error correction is not impossible in all of the above.
(709) is a step of determining whether or not there is an ECC determined to be uncorrectable. If an ECC determined to be uncorrectable exists, the process proceeds to a retry process, and if not, the process proceeds to a subsequent process.
(710) is a step of determining whether an error is detected according to the acquired error detection result flag EDC_NG. If there is an ECC determined to have an error, the process proceeds to a retry process, and if not, the process proceeds to a subsequent process.
(711) is a step of transferring data to the host and updating the retry list reference order table (112).
(712) is a step of updating the retry number.
(713) is a step of referring to the retry reference order table (122) to obtain the retry setting number.
(714) is a step of referring to the retry setting list (120) and setting a parameter corresponding to the retry setting number.

In this way, it is possible to perform retry reproduction processing in the order and settings according to the retry reference order table (122) and the retry setting list (120) according to the number of retries.
(Retry order update process)
Next, the retry order update processing (712) in the present embodiment will be described with reference to FIG. Here, the number of times required for successful retry playback is N times. N is the number of the retry order to be updated.

(801) is a step of acquiring the retry order table (122) and saving it to another area of the data memory (117) before updating.
(802) is a step in which the search target setting in the next step (803) is initialized and set to all of the retry orders 1 to N.
(803) is a step of searching for the retry setting number having the smallest number of EDCNG = 1 (sector determined to have an error) from the retry settings to be searched.
(804) is a step of updating the retry order table (102) so that the retry setting number searched in step (803) is the retry setting for the next retry order n-th.
(805) is a step of excluding the retry setting number obtained as a result of the search in step (803) from search targets for the retry order n + 1 and thereafter.
(806) is a step of determining whether or not the number n of the retry order to be updated has reached the number of times N required to succeed in the retry reproduction. After incrementing the value, steps (803), (804), and (805) are re-executed. If the number of times N required for successful retry playback is reached, the retry order update is terminated.

  By such processing, the retry order table (122) is executed in an early retry order in the order in which the number of error detection sectors by EDC is small, that is, in the order in which the reproduction performance in the area is judged to be good after a successful retry. Can be updated as

  In addition, in FIG. 8, an example of updating the retry order table (122) using the number of error detection sectors in one block as an index has been described. However, there is an error in error detection in EDC when error correction in ECC is impossible. If this is considered to be almost equivalent to this case, the same retry order table (122) update process may be performed using the ECC error-correctable number as an index instead of EDC_NG.

  When each retry playback is performed by the data storage processing and retry order update processing described above, the error correction result or error detection result of the result of reading with each setting is obtained, and the result after successful retry playback. The order of retry conditions can be rearranged so that priority is selected for playback conditions that are judged to be superior based on the above.

  In this way, it is possible to provide a method for realizing optimal rearrangement of retry conditions with a small number of retry processes.

  Next, Example 2 is described below.

(Configuration of memory controller (111) and buffer memory (112))
An example of the memory controller (111) in this embodiment is shown in FIG.
The memory controller (111) has a reproduction mode setting means (901), an access control means (902), a data copy means (903), a memory address generation means (904), and a selector (905). The buffer memory (112) has a normal read data storage area (906) and a retry storage area (907).

  The reproduction mode setting means (901) is a means for setting between normal reproduction (reproduction processing before retry) or retry reproduction, and is a register writable by the microprocessor (116), for example.

  The access control means (902) sends data to and from the buffer memory (112) in accordance with an access request to the buffer memory (112) from the demodulation circuit (110), error correction circuit (113), and host interface (114). Controls writing and reading. Further, position information (symbol position information) in the block relating to the data requested to be accessed is output to the memory address generation means (904).

  The data copy means (903) requests the access control means (902) to read the area specified by the microprocessor (116) and write to another area in accordance with the data copy command from the microprocessor (116). Issue.

  The memory address generation means (904) receives the symbol position information generated by the access control means (902) and generates two types of address information, a normal read data storage area address and a retry storage area address.

  The selector (905) selects one of the normal read data storage area address and the retry storage area address generated by the memory address generation means (904) and outputs it to the buffer memory (112). More specifically, when the selection result in the playback mode setting means (901) is a retry process, and the access request type is any one of demodulated data storage, error correction / detection, and data copy read, it is for retry. A storage area address is selected. Otherwise, a normal read data storage area address is selected.

  The normal read data storage area (906) is a data storage area corresponding to the normal read data storage area address in the address signal generated by the memory address generation means (904). This is a data storage area for copying and overwriting data for which error detection was desired in error detection.

  On the other hand, the retry storage area (907) is a data storage area corresponding to the retry storage area address, and is mainly used for storing demodulated data in the retry process.

(Data storage processing)
In the data storage processing in this embodiment, data storage and error correction / detection processing are performed by dividing the storage area on the buffer memory (112) for normal read and retry playback, and errors are detected in the retry playback processing. Only the unsuccessful data is moved to the normal read data storage area (906). As a result, error-free data is efficiently stored in the normal read area, and the retry reproduction can be completed with a small number of times. On the other hand, from the data stored in the retry storage area (907), the error correction result and error detection result flag EDC_NG are not affected by the previous retry read result as the reproduction result for each retry read setting. Obtainable.

An example of data storage processing in the present embodiment is shown in the flowchart of FIG.
Among these, the processing of (700), (704), (705), (706), (707), (712), (713), (714) is the same as that in FIG. Is omitted.
(1001) is a step in which the microprocessor (116) acquires the value of the retry counter (123), and branches the subsequent processing in the case of zero and one or more times.
(1002) is set to a mode in which the microprocessor (116) performs normal playback with respect to the playback mode setting means (901) when the number of retry playbacks is 0, that is, in the case of normal read, according to the step of (1001). It is a step.
(1003), the memory controller (111) stores the demodulated data in the normal read data storage area (906) of the buffer memory (112) in response to the setting to perform normal playback with respect to the playback mode setting. It is a step.
(1004) is set to a mode in which the microprocessor (116) performs retry playback for the playback mode setting means (901) in the case of retry playback of one or more times according to the step of (1001), that is, retry playback. It is a step.
(1005) is a step in which the memory controller (111) stores the demodulated data in the retry storage area (907) of the buffer memory (112) in response to the setting of the playback mode to perform retry playback. It is.
(1006) indicates that the microprocessor (116) issues a data copy command to the data copy means (903) and the sector in which no error is detected among the data stored in the retry storage area (907). In this step, data is copied from the retry storage area (907) to the normal read data storage area (906).
(1007) is a step of obtaining an error detection determination result for all sectors, including all retry reproductions up to that point. That is, a 32-bit variable EDCNG_ALL corresponding to the error detection result of each sector (representing a sector in which an error is detected in 1 bit, all initial bits are 1) is provided, and each time a retry is performed, The microprocessor (116) is updated by obtaining a logical product with each bit of the error detection flag {EDCNG (n, 0),..., EDCNG (n, 31)} obtained in step (707).
(1008) is a step in which the microprocessor (116) checks whether the 32 bits of EDCNG_ALL are all 0. If not, there is an error in the data stored in the normal read data storage area (906). As a matter of course, the process proceeds to steps (712), (713), and (714), and the retry process is repeated. On the other hand, in the case of 0, it is assumed that there is no error in the data stored in the normal read data storage area (906), and the retry process is terminated.
(1009) is a step of transferring data to the host and updating the retry order table (122). Here, as the data to be transferred to the host, the data stored in the normal read data storage area (906) is selected by the memory address generation means (904), the access control means (902), and the reproduction mode setting means (901). .

(Retry order update process)
Next, the retry order update processing in the present embodiment will be described with reference to FIG.
In this figure, (801), (802), (803), (804), (805), (806), and (807) are the same as those in FIG.
(1101) is a step in which the evaluation target area for retry setting is set to be one block and initialization is performed.
(1102) is a step of excluding, from the evaluation target area, a sector in which no error was detected during reproduction with the retry reproduction setting selected in step (805).
This process differs from the example in Fig. 8 in that all sectors in Fig. 8 were always subject to EDCNG evaluation, but sectors where EDCNG = 0 with a smaller number of EDCNG retries were evaluated. It is a point to exclude from. This is because, in the retry setting with the lower retry order, the playback performance in the area where no error has occurred in the upper retry setting is not required, but only the performance in the area where the error remains is required. It corresponds to. In other words, by determining the order of the lower setting only for the area excluding the sector that is expected to succeed in the data reading with the higher setting of the retry order, the order is rearranged in the optimum order according to the above request. It becomes possible. Such processing is particularly effective when there are a plurality of types of error occurrence factors in one block and the retry reproduction processing settings effective for reading are different.
If the cause of error is uniform within one block, the retry order update process of FIG. 8 may be used.

  With the apparatus and method of the second embodiment described above, the retry setting can be rearranged in an optimal order in the retry process that holds data for reading until the previous retry.

  As described above, in the present embodiment, an error correction result or an error detection result obtained as a result of reading with each setting at the time of each retry playback is obtained, and each retry playback condition is determined based on the result after successful retry playback. The superiority or inferiority is discriminated, and the selection order of the retry conditions is rearranged so that the superior reproduction conditions are preferentially selected. In addition, a data storage area for retry playback is provided in the buffer memory in addition to the data area for normal playback, and error correction and error detection during retry playback are performed on the data storage area for retry while retry settings are made. Only the data portion in which the error disappears at the completion of reading in is copied to the normal reproduction area, and data having no error is stored in the normal reproduction area. The selection order of retry reproduction conditions is rearranged based on the error correction result and error detection result obtained from the retry area.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  In addition, each of the above-described configurations may be configured such that some or all of them are configured by hardware, or are implemented by executing a program by a processor. Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  In the above embodiment, the optical disk reproducing apparatus has been described as an example. However, an optical disk recording / reproducing apparatus may be used, and the present invention can be applied to reproduction processing of a data recording / reproducing apparatus such as an optical disk drive apparatus. it can.

  Further, the recording medium is not limited to the optical disc, and the present invention can be applied to various recording media.

(101) is a disc, (102) is an optical pickup,
(103) is a servo signal generation circuit, (104) is a servo compensator, (105) is an equalization circuit 1,
(106) is an A / D conversion circuit, (107) is a PLL circuit, (108) is an equalization circuit 2,
(109) is a binarization discrimination circuit, (110) is a demodulation circuit, (111) is a memory controller,
(112) is a buffer memory, (113) is an error correction circuit, (114) is a host interface,
(115) is the microcontroller interface, (116) is the microprocessor, and (117) is the data memory
(118) is a host device, (119) is a program memory, (120) is a retry setting list, (121) is an error correction result flag table, (122) is a retry list reference order table, and (123) is a retry counter. .

Claims (8)

An information reproducing apparatus for reading data in units of data blocks composed of a plurality of block codes,
An error detection and correction circuit for decoding the block code;
A microprocessor for controlling the information reproducing apparatus;
A microcomputer interface used by the microprocessor to obtain the result of the error detection and correction circuit;
A program memory storing the processing code of the microprocessor;
The microprocessor includes a data memory that can be read and rewritten,
The program memory has a retry setting list including a retry setting number and a retry parameter corresponding to the retry setting number,
The data memory includes a retry order table that associates the retry setting number with the execution order, and a retry counter that corresponds to the number of times of retry reading for the same data block,
Based on the processing result of the error detection and correction circuit, the microprocessor performs retry reading when it is determined that correct data has not been obtained,
The microprocessor sets retry parameters according to the retry counter, the retry order table, and a retry setting list,
An information reproducing apparatus that performs retry reading. It further has an error correction result flag table for storing the processing result of the error detection and correction circuit for each retry read until correct data is obtained,
It is determined that correct data has been obtained in the retry reading, and
The information reproducing apparatus according to claim 1, wherein the retry order table is updated according to information in the error correction result flag table. A buffer memory for storing the reproduced data;
Data copy means for copying data in the buffer memory to another area;
The buffer memory has at least a normal data storage area and a retry data storage area separately,
During the retry reproduction, data storage and processing by the error detection and correction circuit are performed using the retry data storage area, and only the data determined to have obtained correct data are used for the normal use by the data copying unit. Copy to the data storage area,
3. The information reproduction according to claim 2, wherein retry reading is performed until it is determined that correct data is stored in the normal data storage area over the entire data block in accordance with information in the error correction result flag table. apparatus. The error correction result flag table indicates a code determined to be uncorrectable in error correction processing by the error detection and correction circuit,
4. The information reproducing apparatus according to claim 2, wherein the retry order table is updated so that the order becomes higher as the number of codes determined to be uncorrectable is smaller. The error correction result flag table indicates a code determined to contain an error in error detection processing by the error detection and correction circuit,
4. The information reproducing apparatus according to claim 2, wherein the retry order table is updated so that the order becomes higher as the number of codes determined to contain an error is smaller. The error correction result flag table indicates a code determined to be uncorrectable in error correction processing by the error detection and correction circuit,
The process of updating the retry order table includes:
A step of evaluating the superiority of the retry results;
Setting a code to be evaluated;
Is repeated,
In the step of evaluating the superiority or inferiority of the retry result, according to the result regarding only the area set in the step of setting the code to be evaluated, the retry setting that minimizes the number of codes determined to be error-correctable is determined,
In the step of evaluating the superiority or inferiority of the retry result, the step of evaluating the superiority or inferiority of the retry result from the next time on the information from the area where correct data was obtained in the setting determined in the step of evaluating the superiority or inferiority of the retry result. 4. The information reproducing apparatus according to claim 3, wherein the information reproducing apparatus is excluded from the evaluation target in (3). The error correction result flag table indicates a code determined to have an error in error detection processing by the error detection and correction circuit,
The process of updating the retry order table includes:
A step of evaluating the superiority of the retry results;
Setting a code to be evaluated;
Is repeated,
In the step of evaluating the superiority or inferiority of the retry result, according to the result relating only to the region set in the step of setting the code to be evaluated, the retry setting that minimizes the number of codes determined to have an error is determined,
In the step of evaluating the superiority or inferiority of the retry result, the step of evaluating the superiority or inferiority of the retry result from the next time on the information from the area where correct data was obtained in the setting determined in the step of evaluating the superiority or inferiority of the retry result. 4. The information reproducing apparatus according to claim 3, wherein the information reproducing apparatus is excluded from the evaluation target in (4). An information reproduction method for reading out data in units of data blocks composed of a plurality of block codes,
A decoding step of decoding the block code;
An error detection correction processing step for performing error detection correction processing on the decoded data;
From the processing result of the error detection processing step, when correct data is not obtained, executing a retry read,
Retry according to the retry counter corresponding to the number of times of retry reading for the same data block, the retry setting list including the retry setting number and the retry parameter corresponding to the retry setting number, and the retry order table associating the retry setting number with the execution order. A step for setting parameters,
Information reproducing method including:

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