KR100910553B1 - Data cd reading method for including a sync error - Google Patents

Abstract

A method for reading a data CD including a sync error is provided to replace error sync data of an object sector with normal sync data, thereby improving recovery rate. A method for reading a data CD including a sync error is as follows. CD data is read from a data CD(ST10). A sector to be read is discriminated successively about a plurality of sectors included in the CD data(ST30). Whether there is an error in the sync data in the read sector is determined(ST40). When the sync data is erroneous, it is determines whether consecutive normal sectors following the read sector exist within the set sector range(ST50). When the normal sectors exist, error sink data of the read sector is set as normal sync data(ST60). The corrected sector is provided for error correction decoding(ST70).

Description

Data CD Reading Method for including a Sync Error}

The present invention relates to a sync error recovery technique, and more particularly, when a sector with error sync data is found when reading a data CD, the subsequent set of sectors is examined in various ways to recover the error sync data from the result. If possible, it relates to a method of reading a data CD that includes a sync error that corrects the error and provides for decoding.

In general, a CD recording method is a method of recording data on a compact disc (CD) medium such as a recordable compact disc (CD-R) or CD-RW. At Once, track-level recording is divided into Session At Once and Multisession recording.

Disc-at-once is a recording method where the entire disc becomes one session, and the session ends with one recording, so even if there is a lot of space, no additional recording is possible. After recording TOC (Table Of Content) in the table of contents, the remaining area Record data sequentially. Most audio CDs, master CDs, and game CDs are produced in this way because the recording is continuous from start to finish without interrupting the recording. Because the table of contents information of the CD is recorded at the beginning of the disc, the recognition time is fast and additional storage of contents is not possible.

Track-by-track is a method of dividing a compact disc (CD) into tracks and recording track-by-track, with each track recording turning the laser off and then on again, repeatedly recording, and before final closing You can record additional tracks at any time. There is a gap between tracks, and because the table of contents information of the CD is recorded after the data is written, the recognition time is slow, but additional storage is possible later.

The prior art data CD reading method uses a method of rereading the sector without recovery efforts or skipping the error sector and recovering the normal sector after an error in the sync data of the sector to be read. Only error correction was attempted for.

In addition, when data CD is read, when the sync data of the sector to be read cannot be read due to scratches or electrical shock, an operation of reading back from the beginning to the corresponding sector is performed to find a normal sector. At this time, if the normal sync data cannot be read, the current sector to be read is discarded and the next sector is moved.

Conventionally, when sync data on a sector has an error when reading a data CD, it is necessary to read the sector again without error recovery efforts, skip the sector in which the error occurs, find a normal sector thereafter, or read from the beginning to the corresponding sector again. However, this method has a problem in that the time required to read the CD again and the error sync data are interrupted due to abandonment of the error sync data, or the data CD misreading of the current song is terminated and just skips to the next song. .

The method of reading data CD with sync error improves the possibility of error correction by the recovered sector by replacing the error sync data of the sector to be read with normal sync data, and the problem of unevenness of the recovered sector or the problem of unauthorized protruding of subsequent songs. In order to improve the error recovery rate, it is possible to connect a natural sound to scratches or electric shocks, and to reduce the number of rereads of data CDs.

The present invention for achieving the above object includes the following configuration.

That is, a data CD reading method including a sync error includes (a) reading CD data from a data CD; (b) storing the read CD data in a buffer; (c) identifying sectors to be read sequentially for the plurality of sectors included in the stored CD data; (d) determining whether there is an error with sync data formed in the identified read target sector; (e) if the sync data turns out to be an error, determining whether a normal sector having normal sync data exists after the sector to be read; (f) correcting and setting the sync data of the sector to be read to the normal sync data value when the normal sector exists; And (g) providing the corrected read target sector to error correction decoding.

In the method of reading a data CD including a sync error according to the present invention, step (e) is a step of determining whether a plurality of normal sectors having normal sync data are continuously present after the sector to be read.

In the method of reading a data CD including a sync error according to the present invention, step (e) is a step of determining whether or not a normal sector exists within a preset sector range from after the read target sector.

In the method of reading a data CD including a sync error according to the present invention, step (e) may include determining whether a sector immediately following the sector to be read is a normal sector.

In the method of reading a data CD including a sync error according to the present invention, step (e) may include determining whether all of a plurality of preset sectors immediately following the sector to be read are all normal sectors.

In the method of reading a data CD including a sync error according to the present invention, in step (f), if one or more normal sectors exist after the sector to be read, the sync data found to be the above error is the normal sync data value of the normal sector. Step of replacing; characterized in that.

In the present invention, the method of reading data CD including sync error improves the possibility of error correction by the recovered sector by replacing the error sync data of the sector to be read with normal sync data, and the sound breakup of the sector recovered by error recovery or the subsequent music without permission. By solving the problem of protrusions, the recovery rate is improved, allowing natural sound connections to scratches or electric shocks, and reducing the time required to reread data CDs.

EXAMPLE

1 is a diagram illustrating a data CD reading method including a sync error according to an embodiment of the present invention.

Referring to FIG. 1, in the method of reading a data CD including a sync error, the error sync data 10 identified from the sector to be read 20 of the data CD is corrected and set to a normal sync data value 30, and then error correction is performed. This method of decoding increases the error correction rate of recovered sectors, enables natural sound connections to scratches and electrical shocks, and reduces the time required to reread data CDs.

The method of reading a data CD including a sync error performed in an embodiment of the present invention provides a processor 100 which provides a sector 60 corrected with error sync data 10 to a normal sync data value 30 to an error correction decoder. On the basis of this, the following processing is first mentioned.

In addition, the error sink data 20 will be described with reference to FIG. 1, which is divided into a state before the correction setting and a state after the correction setting.

That is, as a description of the state before the error sink data 20 is corrected and set, the data CD reading method including the sync error inserts a data CD having a large number of sectors into the CD reader and then inserts the data CD from the inserted data CD. The CD data is read to identify a number of sectors.

As multiple sectors are identified by the CD reader, the read CD data is stored in a buffer, and the processor 100 sequentially reads the multiple sectors of CD data stored in the buffer. Here, the sectors sequentially read by the processor 100 are collectively named as the read target sector 20.

The processor 100 identifies a read target sector 20 that reads a plurality of sectors sequentially, and checks whether there is an error state with respect to the sync data formed in the identified read target sector 20. As a result, when the processor 100 determines that the sink data is normal, the processor 100 directly provides the identified read target sector 20 to the decoder without correcting the setting of the sink data.

On the other hand, when the processor 100 determines that the sink data is an error, the processor 100 performs a check on whether the sector is recoverable, and if it is determined that the sector is recoverable, corrects the corresponding sector and decodes the sector. In the present invention, by checking a series of sectors after the sector in which the error sink 10 is found and checking whether or not the normal sector 40 exists, it is determined whether the error sink sector 20 is recoverable.

That is, the processor 100 recognizes the existence of the normal sector 40 having the normal sync data after the sector to be read after the series of sector checks, and thus, the sink data of the sector to be read 20. Set to the normal sync data value 30.

More specifically, in recognizing that there is a normal sector 40 having normal sync data after the sector to be read 20, the processor 100 appropriately makes a multi-faceted decision that meets the following conditions. On the basis of this, the error sink 10 of the sector to be read 20 is corrected and set to the normal sync data value 30.

First, when the processor 100 recognizes that one or more normal sectors 40 having normal sync data exist after the sector 20 to be read, the damage of the sector to be read 20 is recoverable. The error sink data 10 of the read target sector 20 can be corrected and set to the normal sync data value 30.

Second, when the processor 100 recognizes that one or more normal sectors 40 exist within the preset sector range from after the sector to be read 20, the damage of the sector to be read 20 is recoverable. The error sink data 10 of the read target sector 20 can be corrected and set to the normal sync data value 30.

Here, when a large number of error sink sectors are found after the read target sector 20, it is preferable to abandon the correction setting of the read target sector 20. This is because a relatively large number of data errors has occurred, and thus the possibility of decoding and error correction for the user data included in the corrected sector is rare.

Third, when the processor 100 recognizes that the sector immediately next to the read target sector 20 is the normal sector 40, the error sink data 10 of the read target sector 20 is converted into the normal sync data value 30. Correction can be set.

Similar to the above, when the processor 100 recognizes all of the preset plurality of sectors immediately following the sector to be read 20 as normal sectors, the processor 100 recognizes the error sink data 10 of the sector to be read 20. The normal sync data 30 may be corrected and set.

Fourth, when the processor 100 recognizes that there are a plurality of normal sectors 40 from after the read target sector 20, the processor 100 may identify the sink data 10 that is found to be the same as the normal sync data value for each of the plurality of normal sectors. 30).

In this way, the processor 100 makes a multi-faceted determination corresponding to the conditions presented in the above four embodiment forms that there is a normal sector 40 having normal sync data after the sector to be read 20, and thus the object to be read. The error sink data 10 of the sector 20 is corrected and set to the normal sync data value 30.

The processor 100 after the correction setting provides the error correction decoding with the normal sector 60 including the normal sync data 50 set to be corrected based on multiple judgments corresponding to the conditions presented in the four embodiments. do.

2 illustrates processing in which a normal sector is error corrected decoded in accordance with an embodiment of the present invention.

Referring to FIG. 2, the process of error correcting decoding a normal sector from providing the error correcting decoder 200 with the normal sector 60 including the normal sync data 50 corrected by the processor 100. Begins.

That is, the processor 100 may apply the multi-faceted determination according to any one of four conditions by the normal sector 40 having the normal sync data after the sector to be read, so that the error sink of the sector to be read 20 is applied. The data 10 may be corrected and set to the normal sync data value 30.

Here, to reiterate that the processor 100 executes the multilateral determination based on the conditions presented in the four embodiment forms, first, the processor 100 has normal sync data after the sector to be read 20. When it is recognized that one or more normal sectors 40 exist in succession, it is determined that the damage of the read target sector 20 is recoverable, and the error sync data 10 of the read target sector 20 is converted into the normal sync data value ( 30).

Second, when the processor 100 recognizes that one or more normal sectors 40 exist within the preset sector range from after the sector to be read 20, the damage of the sector to be read 20 is recoverable. The error sink data 10 of the sector to be read 20 is corrected and set to the normal sync data value 30 by doing so.

Third, when the processor 100 recognizes that a sector immediately following the sector to be read 20 or a plurality of predetermined sectors continuously connected to the sector is considered to be a normal sector, the processor 100 normally sinks the error sink data 10 of the sector to be read 20. Correct setting is made to the data value 30.

Fourth, when the processor 100 recognizes that there are a plurality of normal sectors from after the read target sector 20, the processor 100 may turn the error-proven sync data 10 into the same normal sync data value 30 for each of the plurality of normal sectors. Replace.

Subsequently, the processor 100 checks whether or not the plurality of sectors (1 to N) including the correct set normal sector 60 is in a readable state, and if it is determined that the state is readable, from 1 to N Provides the normal sector 60 of the error correction decoder 200.

If the processor 100 checks a large number of sectors in an unreadable state, as described above with reference to FIG. 1, the processor 100 recognizes that at least one normal sector does not exist within a preset sector range after the read target sector 20. Or, it recognizes that a plurality of normal sectors are discontinuously, and abandons the correction setting of the read target sector 20.

The reason for this is that a relatively large number of data errors has occurred, and therefore, the possibility of decoding and error correction for the user data included in the corrected sector is scarce.

The error correction decoder 200 according to an exemplary embodiment of the present invention has already set the sync data included in the N sectors 60 by the processor 100 according to various decisions corresponding to the conditions presented in the four embodiments. As a result, decoding (or decoding) and error correction are performed on the N user data associated with the N set sync data 50.

The error correction decoder 200 restores the user data to the original data by decoding (or decoding) and error correcting the N user data included in the N normal sectors, and the error data partially present in the restored original data. Correct the value to the normal value.

Additionally, the error correction decoder 200 is a decoding device that decodes digitally coded user data and converts the user data into an analog signal corresponding thereto. The error correction decoder 200 restores the user data to the original data and performs error correction on the user data. It also plays a role.

The error correction decoder 200 mainly uses the C3 decoding method and is complicated in circuit because it performs both decoding and error correction of user data. However, the error correction decoder 200 is more versatile so that more accurate decoding and error may be achieved. Correction can be performed.

3 is a flowchart illustrating a data CD reading method including a sync error according to an embodiment of the present invention.

Referring to FIG. 3, in the method of reading a data CD including a sync error, the error sync data identified from the sector to be read of the data CD is corrected and set to a normal sync data value, and then provided to error correction decoding to correct the error by the recovered sector. This method increases the possibility of correction, reduces the wasted time by reducing the number of rereads of data CDs while allowing natural sound connections to scratches and electric shocks.

The data CD reading method including the sync error executed in the embodiment of the present invention first sets the error sync data to the normal sync data value, and then first processes the processing based on the processor providing the error correction decoder. .

That is, the data CD reading method including the sync error inserts CD data having a plurality of sectors into the CD reader, and then checks the plurality of sectors by reading the CD data from the inserted data CD (ST10).

As a plurality of sectors are identified by the CD reader, the read CD data is stored in the buffer (ST20), and the processor sequentially reads the plurality of sectors contained in the CD data stored in the buffer.

Here, sectors sequentially read by the processor are collectively named as read target sectors.

In other words, the processor identifies a read target sector which has sequentially read a plurality of sectors, and checks an error state for sync data formed in the identified read target sector (ST30).

As the processor determines whether or not an error has occurred with respect to the sync data formed in the identified read target sector (ST40), if the sink data turns out to be an error, the processor determines whether a normal sector having normal sync data exists after the read target sector. (ST50)

However, if the processor fails to determine the sink data as an error, it determines that there is no error and immediately provides the identified read target sector to the error correction decoder without setting the correction of the sink data.

Subsequently, the processor corrects and sets the sync data of the read target sector to the normal sync data value in accordance with the recognition that a normal sector having normal sync data exists after the read target sector, and then error corrects and decodes the corrected read target sector. Provided to (ST60, ST70).

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

1 is a diagram illustrating a data CD reading method including a sync error according to an embodiment of the present invention.

2 illustrates processing in which a normal sector is error corrected decoded in accordance with an embodiment of the present invention.

3 is a flowchart illustrating a data CD reading method including a sync error according to an embodiment of the present invention.

Claims (6)

delete delete A method for correcting reading when an error occurs in sync data in CD data, (a) reading the CD data from the data CD; (b) identifying sectors to be read sequentially for the plurality of sectors included in the CD data; (c) determining whether an error occurs in sync data in the read target sector; (d) when the sync data is found to be an error, determining whether a plurality of normal sectors having normal sync data are continuously present within a preset sector range following the sector to be read; (e) correcting and setting error sync data of the read target sector to a normal sync data value when the normal sector exists; And (f) providing the corrected read target sector to error correction decoding; A data CD reading method comprising a sync error configured to include a. delete A method for correcting reading when an error occurs in sync data in CD data, (a) reading the CD data from the data CD; (b) identifying sectors to be read sequentially for the plurality of sectors included in the CD data; (c) determining whether an error occurs in sync data in the read target sector; (d) if the sync data is found to be an error, determining whether all of a plurality of preset sectors following the sector to be read are normal sectors; (e) correcting and setting error sync data of the read target sector to a normal sync data value when the normal sector exists; And (f) providing the corrected read target sector to error correction decoding; A data CD reading method comprising a sync error configured to include a. delete

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