KR100424489B1 - Method for controlling of retry play in optical disc device - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a reproduction retry control method of an optical disk device and a computer readable recording medium having recorded thereon a program for realizing the method.

2. Technical problem to be solved by the invention

The present invention provides a time limit required by a host computer or system by applying a time limit as well as a number of retries when analyzing an error factor generated when data is reproduced in an optical disk device and performing a retry operation considering the characteristics of the factor. It is an object of the present invention to provide a reproduction control method of an optical disk device that can comply with the requirements of the present invention and perform a sufficient retry operation during that time, and a computer-readable recording medium having recorded thereon a program for realizing the method.

3. Summary of the Invention Solution

The present invention relates to a reproduction retry control method of an optical disc apparatus, comprising: a first step of storing a position on an optical disc for which error has been confirmed upon reproduction of an optical disc, and analyzing an error cause; A second step of checking the number of reproduction retries and the total retry time of the error-checked optical disc; While reproducing retries are performed by adjusting the number of retries and the reproducing speed according to the error factor analyzed in the first step and whether the speed limit time is exceeded while the retry retry number is not exceeded and the total retry time is not exceeded. Third step; And a fourth step of stopping a reproduction retry and treating it as a final error if the reproduction retry count is exceeded and the total retry timeout is confirmed.

4. Important uses of the invention

The present invention is used for reproduction of an optical disk device.

Description

Method for controlling retry play in optical disc device

The present invention relates to a reproduction retry control method of an optical disk device and a computer readable recording medium having recorded thereon a program for realizing the method.

In general, an optical disk device (CD-ROM Drive or DVD-ROM Drive) may fail due to disturbance, dust, and scratches of the disk itself in the process of reproducing the data of the inserted disk, thereby causing an error.

Therefore, the optical disk apparatus attempts the reproduction operation again at the position of the region of the disk where an error occurs during reproduction, and accurately determines the presence or absence of an error.

Herein, a reproduction retry operation according to an error occurring when a conventional optical disc is reproduced will be described with reference to FIGS. 1 and 2.

1 is a first exemplary flowchart of a replay retry control method of a conventional optical disc apparatus.

As shown in Fig. 1, the optical disk apparatus searches for a target position on the optical disk inserted by a data read command inputted from the outside, and performs a reproduction operation (S11, S12).

At this time, the recording data read by the optical pickup in the reproduction operation is decoded through a decoder and an interface, and it is checked whether the decoding is completed in the data size or the set format requested by the host (S13).

When the completion of decoding is confirmed in the process (S13), it is determined whether an error occurs through the decoded data (S14). Therefore, when it is determined in step S14 that an error does not occur in the decoded data, the current position of the disc is updated (S15), and the recorded data of the optical disc is continuously read from the updated position and decoding is completed. Returning to the process of checking (S13) to repeat the loop.

On the other hand, if an error occurs in the decoded data as a result of the determination in step S14, the microcomputer (not shown) stores the error position of the optical disc currently being reproduced (S16), and the number of retry attempts for which the current reproduction attempt is set. It is determined whether it exceeds (S17).

As a result of the determination in step S17, if the number of retries, that is, the number of repetitions of replay at the same location is not more than five, the microcomputer searches for the error location of the previously stored optical disc in step S16. In step S18, the process returns to step S12, and the loop is repeatedly performed at the position of the searched optical disc through the reproduction operation.

On the other hand, as a result of the determination in the step S17, when the reproduction retry exceeds the set number of retries, error processing of the finally inserted disc is performed, and the loop ends (S19).

That is, conventionally, when an error occurs while performing a reproducing operation on the data on the optical disk, the position where the error occurred is stored and the pickup is moved to the stored position again to replay the error. The number of repetitions is designated so that playback retries are continuously performed for that number of times.

Here, the number of repetitions of the replay retry is determined according to the characteristics of the system. In particular, if the number of repetitions is too small, the possibility of reproducing data decreases. On the contrary, if the number of repetitions is too large, the time required for error processing is long. You lose.

Therefore, in order to improve the playback environment according to the number of retries, it is necessary to perform the retry by changing the playback mode. In particular, recently, the playback speed of the optical disk devices is operating at a high speed, so that a low speed mode is played rather than a high speed. Appropriate speed-down methods have been developed, which are advantageous for time errors.

2 is a second exemplary flowchart of a reproduction control method of a conventional optical disk device.

As shown in Fig. 2, first, the optical disk apparatus initializes the number of reproduction retry counters to 0 (Loop = 0) (S21), and sets the target position on the optical disk inserted by the data read command inputted from the outside. A search is performed and a reproduction operation is performed (S22, S23).

The recording data read out from the optical pickup by the reproduction operation is decoded through a decoder and an interface. At this time, it is checked whether the decoding is completed with the data size requested by the host (S24).

When the completion of decoding is confirmed in the process (S24), it is determined whether an error occurs in the decoded data (S25). Therefore, when an error does not occur in the decoded data as a result of the determination in step S25, the current position of the disc is updated (S26), and the recorded data of the optical disc is continuously read from the updated position and decoding is completed. Returning to the process of checking (S24) to repeat the loop. On the other hand, as a result of the determination in step S25, when an error occurs in the decoded data, the microcomputer (not shown) stores the error position of the current optical disk (S27), and determines whether the current reproduction has exceeded the retry count. (S28).

As a result of the determination in the step S28, if the current playback exceeds the set number of retries, the loop is terminated by processing the final error (S33).

As a result of the determination in the step S28, when the number of retries, that is, the number of repetitions of replay at the same location is not five or more, the retry count counter is increased (S29), and the increased number of retry retries ( It is determined whether the loop is greater than the number of times of the speed limit of down (K) (S30).

As a result of the determination in the step S30, when the increased number of counters is greater than the speed down limit, that is, when the increased number of retries is 4 and the speed down limit is 3, the rotational drive of the optical pickup is controlled. The playback speed of the optical disc is lowered (S31), and the process proceeds to the step S32 of searching for an error position of the previously stored optical disc in step S27.

As a result of the determination in step S30, when the increased number of counters is not greater than the limit of the speed down time, the process proceeds to step S32 of searching for an error position of the pre-stored optical disc in step S27. Therefore, the loop is repeatedly performed through the reproduction operation at the position of the optical disc where the error position is found.

However, since the conventional optical disk device operates only by the number of retries in the reproducing error, the servo is unstable and takes a lot of time in the retry operation. By repeating the operation a predetermined number of times, there is a problem that only the instability of the servo is maintained and the error recovery function is degraded.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and analyzes an error factor generated when data is reproduced in an optical disk device and performs only a retry count in consideration of the characteristics of the factor. In addition, by applying the time limit, a recording method for controlling the reproduction retries of an optical disk device and a program for realizing the method are provided so as to comply with the time limit required by the host computer or system and to perform a sufficient retry operation during that time. Its purpose is to provide a computer readable recording medium.

In addition, the present invention realizes a replay retry control method and the method of the optical disk apparatus for performing retry operation by applying various double speeds evenly during the entire time limit by applying the operation according to the retry by subdividing through the time limit. Another object is to provide a computer readable recording medium having recorded thereon a program for the purpose of recording the program.

1 is a first exemplary flowchart of a replay retry control method of a conventional optical disc apparatus.

Fig. 2 is a second example flowchart of a replay retry control method of a conventional optical disc apparatus.

3 is an exemplary configuration diagram of an optical disk device to which the present invention is applied.

4A and 4B are flowcharts of one embodiment of a replay retry control method for an optical disk device according to the present invention;

※ Explanation of code for main part of drawing

10: optical disc 20: optical pickup

30: R / F section 40: decoder / interface section

50: servo unit 60: drive unit

70: micom 71: memory

100: optical disk device 200: host

According to an aspect of the present invention, there is provided a method of controlling a reproduction retry of an optical disc apparatus, the method comprising: a first step of storing an error identified position on an optical disc during reproduction of an optical disc and analyzing an error cause; A second step of checking the number of reproduction retries and the total retry time of the error-checked optical disc; While reproducing retries are performed by adjusting the number of retries and the reproducing speed according to the error factor analyzed in the first step and whether the speed limit time is exceeded while the retry retry number is not exceeded and the total retry time is not exceeded. Third step; And a fourth step of stopping the reproduction retry and processing as a final error when the number of reproduction retries is exceeded and the total retry time is confirmed.

On the other hand, the present invention is directed to an optical disk apparatus having a processor for retrying playback, comprising: a first function of storing a position on an optical disk in which errors have been identified during playback of the optical disk, and analyzing error factors; A second function of checking the number of reproduction retries and the total retry time of the error checked optical disc; The retry count and the replay speed are adjusted according to the error factor and the speed limit time analyzed in the first function while the retry count is exceeded and the total retry time is not exceeded. Third function; And a computer-readable recording medium having recorded thereon a program for realizing a fourth function of stopping the reproduction retry and processing as a final error when the reproduction retry count is exceeded and the total retry time is confirmed.

Best Mode for Carrying Out the Invention Preferred embodiments of the retry retry control method of the optical disc apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an exemplary configuration diagram of an optical disk device to which the present invention is applied.

As shown in Fig. 3, the configuration includes: an optical pickup 20 for reading recorded data on the optical disc 10; An R / F unit 30 for generating and outputting a servo signal (focus error signal (F.E) and tracking error signal (T.E)) and a high frequency reproduction signal (R.F) from the signal detected by the optical pickup (20); A decoder interface 40 which restores and decodes the generated high frequency reproduction signal to original data and transmits the restored and decoded reproduction data to an external host (PC) 200; A spindle motor 11 for driving the optical disk 10 and a drive unit 60 for driving the optical pickup 20; A servo unit (50) for controlling the driving of the drive unit (60) from the generated servo signals (F.E and T.E) and the rotational speed of the optical disc (10); Performs a playback operation from a command transmitted from the host 200, analyzes and stores an error factor generated during the playback operation, and decelerates the playback speed of the optical disc by the stored number of retries and the time limit. A microcomputer 70 for controlling the reproduction retry; And a memory 71 in which control data necessary for the control operation and the reproduction operation of the microcomputer 70 are stored.

4A and 4B are flowcharts illustrating an exemplary embodiment of a reproduction retry control method of an optical disc apparatus according to the present invention. Hereinafter, the reproduction control method according to the present invention will be described in detail with reference to the configuration of FIG. 3.

First, as shown in FIG. 2, first, the optical disk device initializes the retry counter count to 0 (Loop = 0) (S41), and on the optical disk inserted by the data read command by the host 200. The target position is searched for and a reproduction operation is performed (S42, S43).

The recording data read out from the optical pickup by the reproduction operation is decoded through the decoder and the interface 40. At this time, it is checked whether the decoding is completed with the data size requested by the host (S44).

When the decoding is confirmed in the process (S44), it is determined whether the error of the decoded data occurs (S45). Therefore, when an error does not occur in the decoded data as a result of the determination in step S45, the current position of the disc is updated (S46), and the recorded data of the optical disc is continuously read and decoded at the updated position. The process returns to the process of confirming completion (S44) to repeat the loop.

On the other hand, if an error occurs in the decoded data as a result of the determination in step S45, the microcomputer (not shown) stores the error position of the current optical disk (S46) and retries the error factor generated at the error position. Analyze and store by the time required (S47).

Here, the analysis of the error factor is divided into a long time error and a short time error in the present embodiment. However, by adjusting the weight (N) of the retry count counter, the error factor can be divided into four errors as follows.

Firstly, an error that takes 300 msec or more upon retry regeneration occurs due to the focus drop. In this case, the weight N is set to 40.

Secondly, an error that takes more than 200 msec in retry regeneration occurs due to seld anxiety, etc. In this case, the weight N is set to 30.

Thirdly, an error that takes time of 100 msec or more upon replay regeneration occurs due to track departure, etc. In this case, the weight N is set to 20.

Fourth, an error that takes less than 100 msec in retry regeneration occurs due to simple noise. In this case, the weight N is set to ten.

Here, the weight (N) serves to go to a faster speed down in controlling the speed down by the number of retries (Loop), it is preferable to operate in consideration of the time required during the retry operation.

On the other hand, in step 47, it is determined whether the number of reproduction retries after storing the error factor has exceeded the set number of times (S48).

As a result of the determination in step S48, if the number of replay retries does not exceed the set number of times, it is determined whether the retry attempts exceed the total retry time (S49). Here, the total retry time means a retry time for determining a reproduction error within a range in which the system is not overwhelmed.

Therefore, as a result of the determination in step S49, if the time according to the retry exceeds the total retry time, the process proceeds to the final error processing step S58 to terminate the loop, and as a result, the time according to the number of retries If the total retry time is not exceeded, it is determined whether the current playback error is a long time error (S50).

As a result of the determination in step S50, when the current playback error is identified as a long time error, that is, when the playback error occurs over a set time over a long time, the weight N is added to the current retry count. Then, the process proceeds to step S55 to check whether the number of retries is greater than the number of times of the speed down limit.

On the other hand, as a result of the determination in step S50, when the current playback error is not confirmed as a long time error, that is, when the playback error occurs in a short period, it is determined whether the speed limit time at the time of the current playback is exceeded (S52). If the speed limit time is exceeded, setting the current retry count to the speed limit count (K), and then counting the number of retries by adding one more retry count to determine whether the retry count is greater than the speed limit limit (S55). Proceed to).

Here, the speed limit time in the process (S52) is to limit the time for the retry operation in the constant speed mode, for example, the weight added to the number of retries set according to the error factor is not appropriate or It is intended to prevent less time to retry at a different speed because the time taken for a retry operation at a specific speed is less than the actual situation.

In other words, if the time taken in the current retry speed is exceeded, and the specified speed limit time is exceeded, the count value of the retry count is forcibly recounted, even if the count of the retry count is not yet possible to go to the next double speed. Adjust (step 53) so that it can be retried down to the next step speed. Therefore, it is possible to perform the retry operation at all prepared speeds for a given total retry time.

On the other hand, as a result of the determination in the step S55, if the count value of the retry count is greater than the limit of the speed down time, the rotation drive of the optical pickup is controlled to lower the reproduction speed of the current optical disc (S56), and the previously stored optical The process of searching for an error position of the disk proceeds (S57).

In addition, if it is determined in step S55 that the retry count count is not greater than the speed limit, the process proceeds to step S57 of searching for an error position of the previously stored optical disc. Therefore, the loop is repeatedly performed through the reproduction operation at the position of the optical disc where the error position is found.

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

The replay retry control method of the optical disk device as described above can retry replay according to an error in consideration of the number of executions and the time required, and retry at multiple times within the entire time, thereby improving the data reproducing power. It can increase.

In other words, if the drive is capable of playing up to 32x speed for CD, retry in order of CAV 32x, CAV24x, CAV16x, and CLV8x, then if the total time is 10 seconds, CAV 32x The replay retry is performed at 2 seconds for silver, 2 seconds for CAV 24 times, 2 seconds for CAV 16 times, and 4 seconds for 8 times CLV, thereby maximizing recovery due to data reproduction errors.

Claims (7)

In the reproduction retry control method of an optical disk device, During playback of the optical disc, a first step of storing a location on the optical disc where the error is identified and analyzing the error cause; A second step of checking whether the error has been confirmed, the number of reproduction retries and whether the total retry time is exceeded; While not exceeding the retry retry times and the total retry times, the retry times are weighted according to the retry time required according to the error factor analyzed in the first step. A third step of performing variable adjustment to perform replay retry; And A fourth step of stopping a reproduction retry and treating it as a final error if it is confirmed that the reproduction retry count is exceeded and the total retry time is exceeded; The reproduction retry control method of the optical disk device including a. The method of claim 1, The first step is, A fifth step of checking for an error on the disc during reproduction of the optical disc; A sixth step of storing a position on the optical disc in which the reproduction error is confirmed; And A seventh step of dividing the error types by assigning a weight value according to the time required for retrying playback due to the error; The reproduction retry control method of the optical disk device including a. The method of claim 1, The total retry time in the second step is A reproduction retry control method for an optical disk device, characterized in that the time required until the final error processing is specified irrespective of the reproduction retry time according to an error state. The method of claim 1, The third step, A fifth step of checking the type of error factor analyzed in the first step when the number of reproduction retries is exceeded and the total retries are not exceeded; A sixth step of performing reproduction retry by down-loading when the identified type of error factor is an error having a long retry time; And If the identified error factor is an error having a short retry time, a seventh step of reproducing the retry by adjusting the number of retries by applying a low weight value to the number of retry retries; The reproduction retry control method of the optical disk device including a. The method of claim 4, wherein The seventh step, An eighth step of confirming whether the reproduction speed limit time is exceeded when the type of the identified error factor is an error having a short trial time; A ninth step of setting a current playback retry count to be greater than a speed down limit when the playback speed limit time is exceeded as a result of the checking of the eighth step, and forcibly performing playback retries through the speed down; And A tenth step of counting the number of retries in accordance with the retry retries when the regeneration speed limit time is not exceeded as a result of the checking in the eighth step, and retrying replaying by the speed down according to the counted retries; The reproduction retry control method of the optical disk device including a. The method according to any one of claims 1, 4 or 5, The speed limit time is, Replay retry control method for an optical disk device, characterized in that the retry operation is possible at all prepared double speeds by limiting the time according to the double speed at the time of replay retry, with reference to the total retry time limit. In a recording medium readable by an optical disk device having a processor for retrying reproduction, A first function of reproducing an error on the optical disc in which an error is identified and analyzing the error cause when the optical disc is reproduced; A second function of checking the number of reproduction retries and the total retry time of the error checked optical disc; Depending on the retry time required according to the error factor analyzed in the first function while the retry retry number is not exceeded and the total retry time is not exceeded, the retry number is weighted and the regeneration speed is varied. Adjusting, to perform a replay retry; And A fourth function of stopping the reproduction retry and treating it as a final error if the reproduction retry count is exceeded and the total retry timeout is confirmed. A computer-readable recording medium having recorded thereon a program for realizing this.