KR20040105963A - Apparatus and method for decoding information recorded on BCA of optical disk - Google Patents

Abstract

PURPOSE: A device and a method for decoding information recorded in a BCA(Burst Cutting Area) of an optical disk are provided to complete a decoding of BCA information according to features of data recorded in a BCA, only if more than one unit is read, even though the recorded data is not completely read. CONSTITUTION: A BCA unit reader(201) reads a predetermined number of BCA units including BCA information, error correction codes, and repeated frequency information from a BCA of an optical disk(10). A BCA unit demodulator(202) demodulates the read BCA units. A BCA unit correcting portion(204) corrects errors of normally demodulated BCA units by using error correction codes included in the normally demodulated BCA units, when more than one BCA unit is normally demodulated. A BCA information decoder(211) decodes BCA information included in the normally corrected BCA units.

Description

Apparatus and method for decoding information recorded on BCA of optical disk}

The present invention relates to an apparatus and method for decoding information recorded in a BCA of an optical disc.

The optical disc producer can record information desired by the optical disc (generally DVD) after completion of the manufacturing process, for example, the serial number of the optical disc and copy protection information. The area in which this information is recorded is called BCA (Burst Cutting Area) and is located on the inner circumference of the optical disk. When the optical disc is inserted into the playback apparatus, decoding of this area is performed first. Therefore, successfully decoding the information recorded in the BCA is an essential step of optical disc reproduction.

1 is a block diagram of a conventional BCA information decoding apparatus.

Referring to FIG. 1, the BCA information decoding apparatus includes a spindle motor 12, an optical pickup 14, an RF amplifier 20, a servo signal processor 22, a servo driver 24, a feed motor 26, and a spindle. Consists of the motor driver 28, the data processor 30, the DRAM 32, the interface 34, the DRAM 36, the microcomputer 40, the memory 42, the key button 50, and the display 52. do.

The information recorded on the surface of the optical disc 10 is read out by the optical pickup 14. The optical pickup 14 optically reads the information recorded on the data recording surface of the optical disk 10 which is rotated by the drive of the spindle motor 12, and converts the optical signal into a radio frequency (RF) signal which is an electrical signal. do. The RF amplifier 20 amplifies the RF signal, generates and outputs a focus error (FE) signal and a tracking error (TE) signal. The servo signal processor 22 generates and outputs a control signal for the focus servo and a control signal for the tracking servo based on the FE signal and the TE signal. The servo driver 24 generates and applies operating power to the optical pickup 14 and the transfer motor 26 to perform the tracking servo and the focus servo based on the control signal for the focus servo and the control signal for the tracking servo. do.

The data processor 30 demodulates the RF signal applied by the RF amplifier 20 and performs error correction of the demodulated data. In addition, the data processor 30 applies the spindle motor control signal to the spindle motor driver 28 to control the spindle motor driver 28 to drive the spindle motor 12.

The interface 34 interfaces various control signals applied between the host computer and the drive, and outputs data applied through the data processor 30 to the host computer. The DRAM 32 is an error correction memory of the data processor 30, and the DRAM 36 is a memory for the transfer data buffer of the interface 36.

The microcomputer 40 is connected to a memory 42 including a ROM for storing control programs for performing various operations and a RAM for temporarily storing various data required for performing or performing various operations. Overall control of the operation. And the microcomputer 40 is connected with the display part 52 which displays the operation state of a drive, and the key button 50 for inputting an operation command.

In general, BCA information is recorded repeatedly. This is because the information recorded in the BCA of the disk is often important information such as the serial number of the product, and the amount of data is relatively small. Since the conventional BCA information decoding apparatus shown in FIG. 1 does not consider the characteristics of such BCA information and tries to read all the data recorded in the BCA, there is a high probability that a BCA information decoding failure will occur, and rapid decoding will not be performed. There was a problem.

The technical problem to be achieved by the present invention is an apparatus capable of completing the decoding of the BCA information according to the characteristics of the data recorded in the BCA, if only one or more units are read even when the data recorded in the BCA is not completely read and To provide a method.

1 is a block diagram of a conventional BCA information decoding apparatus.

2 is a block diagram of an apparatus for decoding BCA information according to an embodiment of the present invention.

3 is a configuration diagram of a BCA located on an inner circumference of the optical disc.

4 is a flowchart of a BCA information decoding method according to an embodiment of the present invention.

The BCA information decoding apparatus according to the present invention for solving the above technical problem is a BCA unit reading unit for reading a predetermined number of BCA units including BCA information, error correction code, and repetition number information from the BCA of the optical disk, A BCA unit demodulator for demodulating the number of BCA units read out from the BCA region reader; A BCA unit correcting unit correcting an error of the normally demodulated BCA unit by using an error correction code included in the normally demodulated BCA unit when one or more BCA units are normally demodulated in the BCA unit demodulator; And decoding the BCA information included in the normally corrected BCA unit when the error of one or more BCA units is normally corrected in the BCA unit correcting unit and the number of repetition information included in the normally corrected BCA unit is the number. And a BCA information decoding unit.

According to another aspect of the present invention, there is provided a method for decoding BCA information, comprising: (a) reading a predetermined number of BCA units including BCA information, error correction code, and repetition number information from a BCA of an optical disc; (b) demodulating the number of BCA units read in step (a); (c) correcting an error of the normally demodulated BCA unit using an error correction code included in the normally demodulated BCA unit when at least one BCA unit is normally demodulated in step (b); And (d) when the error of one or more BCA units is normally corrected in step (c), and the number of repetition information included in the normally corrected BCA unit is the number, the BCA included in the normally corrected BCA unit. Decoding the information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an apparatus for decoding BCA information according to an embodiment of the present invention.

3 is a configuration diagram of a BCA located on an inner circumference of the optical disc.

Referring to FIG. 2, the BCA information decoding apparatus includes a BCA unit reader 201, a BCA unit demodulator 202, a demodulation complete signal generator 203, a BCA unit corrector 204, and a correction complete signal generator ( 205, the first storage unit 206, the second storage unit 207, the demodulation complete register 208, the normal correction notification unit 209, the correction completion register 210, and the BCA information decoding unit 211. It is composed.

The BCA unit reading unit 201 reads N BCA units including BCA information, error correction code, and repetition count information from the BCA of the optical disc (generally DVD). Specifically, the BCA unit reader 201 includes a spindle motor 12, an optical pickup 14, an RF amplifier 20, a servo signal processor 22, a servo driver 24, a feed motor 26, And a spindle motor drive 28. Since each element constituting the BCA unit reader 201 performs the same role as that shown in FIG. 1, a detailed description thereof will be omitted.

Referring to FIG. 3, each BCA unit includes an Information field, a Parity field, and a Repeat field. In the Information field, information desired by the disc manufacturer, for example, the serial number of the disc, copy protection information, and the like is recorded. An error correction code is recorded in the parity field, and parity is one of error correction methods. Repeat count information is recorded in the Repeat field. The BCA unit reader 201 sequentially reads the N BCA units shown in FIG. 3.

The BCA unit demodulator 202 demodulates the N BCA units read by the BCA region reader 201. In other words, the BCA unit demodulator 202 restores the analog signal output from the RF amplifier 20 to the original digital signal recorded on the optical disk. The BCA unit demodulator 202 is usually installed in a data processor.

The first storage unit 206 stores the BCA unit normally demodulated by the BCA unit demodulator 202, that is, restored to a digital signal. The first storage unit 206 is generally a DRAM and serves to temporarily buffer the BCA unit recovered with the digital signal before entering the error correction step.

When one or more BCA units are normally demodulated in the BCA unit demodulator 202, the demodulation complete signal generator 203 generates a demodulation complete signal for each BCA unit that is normally demodulated. For example, a value of 1 is set for a BCA unit that is normally demodulated, and a value of 0 is set for a BCA unit that is not normally read out from the optical disk due to scratches on the surface of the optical disk or the like.

The demodulation complete register 208 stores the demodulation complete signal generated by the demodulation complete signal generator 203. In the demodulation completion register, there is a storage place allocated to each BCA unit, and the value 1 or 0 illustrated above is recorded in this storage place. The demodulation complete register 208 is usually installed in the interface.

The BCA unit correction unit 204 corrects an error of the BCA unit corresponding to the demodulation complete signal stored in the BCA unit demodulation complete register 208 using an error correction code included in the BCA unit stored in the first storage unit 206. do. Since only the BCA unit in which a value of 1 is recorded in the demodulation complete register is normally demodulated, error correction is possible. Therefore, the error correction code is used to correct an error of the BCA unit in which a value of 1 is recorded in the demodulation complete register. Referring to Fig. 3, since the error correction code is recorded for each BCA unit, if one BCA unit is demodulated normally, the error correction code included in that BCA unit is also normally demodulated. The BCA unit correction unit 204 is usually installed in the data processor.

The second storage unit 207 stores the BCA unit normally corrected by the BCA unit correction unit 204. The second storage unit 207 is generally a DRAM, and is an error correction memory used to correct an error of a BCA unit recovered by a digital signal.

When the error of the BCA information included in the one or more BCA units is normally corrected in the BCA unit correction unit 204, the correction completion signal generation unit 205 generates a correction completion signal for each of the normally corrected BCA units. For example, a value of 1 is set for a BCA unit that is normally corrected, and a value of 0 is set for a BCA unit that is not normally corrected. The correction completion signal generator 205 is usually installed in the data processor.

The correction completion register 210 stores the correction completion signal generated by the correction completion signal generator 205. The correction completion register has a storage place allocated to each BCA unit, and the value 1 or 0 exemplified above is recorded in this storage place. The correction completion register 208 is usually installed in the interface.

When the BCA information decoding unit 211 corrects an error of one or more BCA units in the BCA unit correction unit 204 normally, and the repetition count information included in the BCA unit stored in the second storage unit 207 is N, The BCA information included in the BCA unit corresponding to the correction completion signal stored in the correction completion register 210 is decoded. Since only the BCA unit in which a value of 1 is recorded in the correction completion register is normally corrected, decoding is possible. Therefore, the BCA unit in which a value of 1 is recorded in the correction complete register is decoded. The BCA information decoding unit 211 is usually installed in the microcomputer, and after passing through the BCA information decoding unit 211, information desired by the disc producer is output.

When one or more BCA units are not normally demodulated in the BCA unit demodulator 202, or when an error of one or more BCA units is not normally corrected in the BCA unit correction unit 204, any unit in the BCA of the optical disc. Since the BCA unit reading unit 201 reads the N BCA units again, the process is repeated. If the repetition count information included in the normally corrected BCA unit is not N, the same BCA information is not repeatedly recorded in the BCA area, so the BCA unit reading unit 201 reads the N BCA units again. Next, repeat the above process.

If the error of one or more BCA units is normally corrected by the BCA unit correcting unit 204, and the number of repetition information included in the normally corrected BCA unit is N, the error of the BCA unit is normally corrected. Notify the host that it has been corrected. The normal correction notification unit 209 is usually installed in the interface.

4 is a flowchart of a BCA information decoding method according to an embodiment of the present invention.

Referring to FIG. 4, the BCA information decoding method includes the following steps.

N BCA units including BCA information, error correction code, and repetition count information are read from the BCA of the optical disc (401). The demodulated number of BCA units read is then demodulated (402). If one or more BCA units are normally demodulated (403), then normally demodulated BCA units are stored (404). Next, a demodulation completion signal is generated for each normally demodulated BCA unit (405). The generated demodulation complete signal is then stored (406). Subsequently, an error of the BCA unit corresponding to the stored demodulation completion signal is corrected using the error correction code included in the stored BCA unit (407).

If an error of one or more BCA units is normally corrected (408), then the normally corrected BCA unit is stored (409). Subsequently, a correction completion signal is generated for each normally corrected BCA unit (410). Next, the generated correction completion signal is stored (411). If the number of repetition information included in the stored BCA unit is N (412), then the BCA information included in the BCA unit corresponding to the stored correction completion signal is decoded (413), and the error of the BCA unit is normally corrected. Notify the host (414).

If one or more BCA units are not demodulated normally (403), an error of one or more BCA units is not correctly corrected (408), or the number of repetition information included in the normally corrected BCA unit is N If not (412), the N BCA units are read again and the above process is repeated.

Meanwhile, the above-described embodiments of the present invention can be written as a program that can be executed in a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.

The computer-readable recording medium may include a magnetic storage medium (eg, ROM, floppy disk, hard disk, etc.), an optical reading medium (eg, CD-ROM, DVD, etc.) and a carrier wave (eg, the Internet). Storage medium).

So far, the present invention has been described with reference to preferred embodiments. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

According to the present invention, even if the data recorded in the BCA is not completely read out due to the scratch of the disk, if only one or more units are read, decoding of the BCA information can be completed according to the characteristics of the data recorded in the BCA. There is an effect. In particular, according to the present invention, it is possible to quickly grasp the structure of the demodulated BCA using a register, thereby having an effect that the decoding of the BCA information can be completed more quickly.

Claims (15)

A BCA unit reading unit for reading a predetermined number of BCA units including BCA information, error correction code, and repetition count information from the BCA of the optical disk; A BCA unit demodulator for demodulating the number of BCA units read out from the BCA region readout; A BCA unit correcting unit correcting an error of the normally demodulated BCA unit by using an error correction code included in the normally demodulated BCA unit when one or more BCA units are normally demodulated in the BCA unit demodulator; And When the error of one or more BCA units is normally corrected in the BCA unit correcting unit and the number of repetition information included in the normally corrected BCA unit is the number, decoding the BCA information included in the normally corrected BCA unit. BCA information decoding apparatus comprising a BCA information decoding unit. The method of claim 1, When the one or more BCA units are not normally demodulated in the BCA unit demodulator, the BCA unit reading unit does not normally correct an error of one or more BCA units in the BCA unit demodulator, or the normally corrected BCA unit. And repetition number information of the BCA unit is re-read if the number of repetition information included in the number is not the number. The method of claim 1, The BCA unit notifying the host that the error of the BCA unit is normally corrected when the error of one or more BCA units is normally corrected in the BCA unit correcting unit and the number of repetition information included in the normally corrected BCA unit is the number And a normal notification unit. The method of claim 1, A first storage unit for storing the BCA unit normally demodulated by the BCA unit demodulator, And the BCA unit correcting unit corrects an error of the BCA unit stored in the first storage unit by using an error correction code included in the BCA unit stored in the first storage unit. The method of claim 1, A demodulation complete signal generation unit configured to generate a demodulation complete signal for each of the normally demodulated BCA units when one or more BCA units are normally demodulated in the BCA unit demodulator; And A demodulation complete register configured to store a demodulation complete signal generated by the demodulation complete signal generator; And the BCA unit correcting unit corrects an error of a BCA unit corresponding to a demodulation complete signal stored in the BCA unit demodulation complete register using an error correction code included in the BCA unit. The method of claim 1, A second storage unit which stores the BCA unit normally corrected by the BCA unit correction unit, The BCA information decoding unit decodes BCA information included in the BCA unit stored in the second storage unit when the number of times of repetition information included in the BCA unit stored in the second storage unit is N times. Device. The method of claim 1, A correction completion signal generation unit generating a correction completion signal for each of the normally corrected BCA units when the error of the BCA information included in at least one BCA unit is normally corrected by the BCA unit correction unit; A correction completion register for storing a correction completion signal generated by the correction completion signal generator; The BCA information decoding unit decodes the BCA information included in the BCA unit corresponding to the correction completion signal stored in the correction completion register when the number of repetition information included in the BCA unit is the N times. . (a) reading a predetermined number of BCA units including BCA information, error correction code, and repetition count information from the BCA of the optical disc; (b) demodulating the number of BCA units read in step (a); (c) correcting an error of the normally demodulated BCA unit using an error correction code included in the normally demodulated BCA unit when at least one BCA unit is normally demodulated in step (b); And (d) BCA information included in the normally corrected BCA unit when the error of one or more BCA units is corrected normally in step (c), and the number of repetition information included in the normally corrected BCA unit is the number. BCA information decoding method comprising the step of decoding. The method of claim 8, (e) when one or more BCA units are not normally demodulated in step (b), when an error of one or more BCA units is not normally corrected in step (c), or included in the normally corrected BCA unit And rereading the number of BCA units if the number of repeated repetition information is not the number. The method of claim 8, (f) if the error of one or more BCA units is corrected normally in step (c) and the number of repetition information included in the normally corrected BCA unit is the number, notifying the host that the error of the BCA unit has been correctly corrected. BCA information decoding method comprising the step of. The method of claim 8, (c-3) storing the BCA unit normally demodulated in step (b); In the step (c), the error correction code included in the BCA unit stored in the step (c-3) is used to correct the error of the BCA unit stored in the step (c-3). . The method of claim 8, (c-2) when one or more BCA units are normally demodulated in step (b), generating a demodulation complete signal for each of the normally demodulated BCA units; And (c-1) storing the demodulation complete signal generated in step (c-2); The step (c) of the BCA information decoding method characterized in that for correcting the error of the BCA unit corresponding to the demodulation complete signal stored in the step (c-1) using the error correction code included in the BCA unit. The method of claim 8, (d-3) storing the BCA unit normally corrected in step (c), In the step (d), when the repetition count information included in the BCA unit stored in the step (d-3) is N times, the BCA information included in the BCA unit stored in the step (d-3) is decoded. BCA information decoding method. The method of claim 8, (d-2) generating a correction completion signal for each of the normally corrected BCA units when the error of the BCA information included in at least one BCA unit is corrected in step (c); (d-1) storing the correction completion signal generated in the step (d-2); In the step (d), when the repetition count information included in the BCA unit is N times, the BCA information may be decoded in the BCA unit included in the BCA unit corresponding to the correction completion signal stored in the step (d). Decoding method. A non-transitory computer-readable recording medium having recorded thereon a program for executing the method of claim 8.