KR100233665B1 - Detection of synchronization information from optical disk sector - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

In-sector synchronization information detection technology for recording information on optical discs

I. The technical problem that the invention is trying to solve

When reproducing user data recorded in the information recording sector of the optical disc, the synchronization information of the recorded data is accurately detected to perform the correct data reproducing operation.

All. Summary of the Solution of the Invention

When the data recorded in the information recording sector of the optical disc is reproduced, the reproduction data patterns for the synchronization information for synchronizing the reproduction data are divided into a plurality of preset pieces, and the predetermined number of the divided and reproduced data patterns is reproduced. If the abnormality is reproduced normally, it is determined that all the synchronization information has been detected normally.

la. Important uses of the invention:

It can be importantly used for the detection of synchronization information in sectors for recording information on optical discs.

Description

Method and apparatus for detecting intra-sector synchronization information for recording information on an optical disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc apparatus for recording data in an information recording disc such as an optical disc and reproducing the recorded data, and more particularly, to a method and apparatus for detecting synchronization information recorded in an information recording sector of an optical disc.

In the optical recording and reproducing technique of recording and reproducing information on an optical disc using a laser, the information is read as an amount of change of the laser beam reflected light with respect to the optical disc. In the method of changing the reflected light, that is, the method of recording data on the optical disc, a method of using concave pits on the disc substrate to use interference between the pits and the reference plane, and the polarization direction of the magneto-optical recording medium like the magneto-optical disc The method of changing, using the difference in the amount of reflected light depending on the crystallizing state of the recording material, such as a phase change disk (CD-RW), and organic, like a CD-R (CD-Recordable). The method by deformation | transformation of a pigment | dye, etc. are mentioned. Among them, a method capable of repeating recording and reproducing, especially a phase change type method, is widely applied to a compact disc (CD) or a digital video disc or a digital versatile disc (DVD).

Hereinafter, the optical disc format will be described with reference to the accompanying drawings. Various formats of optical discs have been proposed, and various formats have been standardized under the ISO (International Standards Organization) standard, and standardization of new formats is in progress in pursuit of high speed and high density of optical discs. 1 is an illustration of an optical disc, in particular a phase change type optical disc format. Referring to Fig. 1, an optical disc 1 is radially divided into a plurality of zones 1a, 1b, ..., 1s (e.g., 19 zones), each zone having a plurality of information recording tracks. have. The clock signals used in the zones 1a, 1b, ..., 1s have different frequencies (that is, the clock signals increase in frequency from the innermost zone to the outermost zone). One track is composed of a plurality of sectors, which are units for recording information, and the number of sectors per track is the same for the tracks in the same zone, and is different for each zone. For example, the number of sectors in the track in zone 1s, which is the outermost zone, is 30, and the number of sectors in the track in zone 1a, which is the outermost zone, is 48. When data is recorded on the optical disc 1 or the recorded data is reproduced, the optical disc 1 is rotated at a constant speed, and based on the clock signal of the frequency according to each zone, the data is recorded or the recorded data is reproduced by the optical head element. .

Address information such as track number and sector number, signals for frequency synchronization, and the like are preformatted in the so-called header area in each track of zones 1a, 1b, ..., 1s of the optical disc 1 at the time of manufacture of the disc. .

The format of each sector of zones 1a, 1b, ..., 1s of optical disc 1 is shown in FIG. FIG. 2 is an exemplary diagram of a phase change sector format, in particular, a DVD-Random Access Memory (DVD-RAM) sector format, in which a format as shown in FIG. 2 is tracked by a push-pull method. A sector format based on a continuous servo tracking system that is compatible with a continuous tracking system that detects a tracking error signal. Referring to Fig. 2, one sector has a capacity of 2697 bytes, and includes a 128-byte preformatted header area and a 2456-byte data recording area. One byte (BYTE) represents 16 channel bits in an optical disc.

The header area is an SM (sector mark) area that marks the beginning of a sector, and the data is reliably reproduced even if there is a change in the rotation of the disc. The header area is recorded in a continuously repeated data pattern for synchronization of channel bits. VFO1 and VFO2 areas for reproducing data through a locked PLL (Phase Locked Loop), an AM (Address Mark) area recorded with a specific code pattern indicating a synchronous position for reading address code data, and address information. ID1, ID2, ID3 area, and PA (PreAmble) 1 area are included. The ID area includes a track number, a sector number, and a cyclic redundancy check (CRC) code for error detection in the ID area.

The data recording area consists of a 35-byte VFO3 area, a 3-byte SYNC (SYNCronization) area, and a 2418-byte DATA area. In the VFO3 area, a continuous data pattern (synchronization code) for channel bit synchronization is recorded. A special pattern of 48 channel bits is recorded in the SYNC area to indicate the beginning of the DATA area and for synchronization of data bytes. The DATA area is a 4-byte DATAID area in which data area information and data area numbers are recorded, an IDSYNC area for synchronizing the DATAID area, data user data DATA, an ECC (Error Correction Code), and resynchronization for synchronization. It consists of the RESYNC area where the code is recorded. There are a number of RESYNC areas, which are inserted in the middle of the DATA area at regular intervals to ensure byte alignment during data reproduction.

In addition, one sector includes an offset detection flag or mirror surface field (ODF) area, an offset detection flag or a mirror surface field (PAD) area for detecting tracking errors using a push-pull method, a GAP area, a PA (PostAmble) 2 area, and a BUFFER area. . Although not shown, a flag area in which various flags are recorded, and an ALPC (Auto Laser Power Control) area, which is a test area for controlling the laser beam output level, may be appropriately provided.

On the other hand, among the above areas, the GAP area, the BUFFER area, and the like can be varied in length by about 1 byte, that is, 16 channel bits. Since the recording position marks obtained by non-crystallizing the recording medium are randomly distributed, the format of delayed recording data randomly selected from 0 to 16 channel bits in a unit of channel bits (aka random shift). This is because it uses.

Since the GAP area is set randomly within the length of 16 channel bits, data recorded in the next VFO3 area and subsequent areas according to this arrangement is randomly shifted within the 16 channel bit length.

As described above, in the conventional phase change type optical disc, the SYNC region is detected when there are defects, dust, or scratches on the optical disc in three bytes of the SYNC region for data synchronization after a random shift is performed. In some cases, the bytes of data recorded in the DATA area cannot be synchronized in response to the random shift, so that data recorded in the DATA area cannot be reproduced correctly.

It is therefore an object of the present invention to provide a method and apparatus capable of accurately detecting synchronization information in an information recording sector of an optical disc.

Another object of the present invention is to provide a method and apparatus capable of accurately detecting synchronization information of the recorded data during reproduction of user data recorded in a data area in an information recording sector of an optical disc.

It is still another object of the present invention to provide a method and an apparatus capable of accurately detecting synchronization information of recorded data and performing a correct reproduction operation of the recorded data.

In order to achieve the above object, the present invention divides and reproduces a reproduction data pattern for synchronization information for synchronizing reproduction data in reproduction of data recorded in an information recording sector of an optical disc into a plurality of preset pieces, and divides the reproduction data pattern into a plurality of pieces. If more than a predetermined number of the reproduced data patterns are normally reproduced, it is determined that the entire synchronization information has been normally detected.

1 is an illustration of an optical disc format

2 is an exemplary diagram of a sector format

3 is a block diagram illustrating an example of an optical disk apparatus to which the present invention is applied.

4 is a block diagram of an apparatus for detecting synchronization information according to an embodiment of the present invention.

5 is an output signal waveform diagram of each component of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific matters such as specific building blocks are shown, which are provided to help a more general understanding of the present invention, and the specific matters may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

3 is a block diagram of an example of an optical disk apparatus to which the present invention is applied. Referring to FIG. 3, in the optical disk apparatus, information is recorded on the optical disk 1 by the optical head 10, or the recorded information is reproduced. The optical head 10 is supported by the linear motor 20 and is movable to the inside and the outside of the optical disc 1.

The optical head 10 is composed of a semiconductor laser oscillator 13, various lenses, a half prism 17, a tracking coil 11a, a focus coil 11b, and the like. When recording information, the laser oscillator 13 outputs a laser beam of the information recording level, and the laser beam is scanned through the half prism 17 and the position to record the optical disk 1 via the lens. When the information is reproduced, the laser oscillator 13 outputs a laser beam of the information reproduction level, and this laser beam is reflected at the reproduction position of the optical disc 1 and is input to the photodetector 15 via the half prism 17. The laser oscillator 13 is controlled by the laser controller 21 to control the level of the output laser beam and the output on / off interval. The laser controller 21 controls the laser oscillator 13 in accordance with, for example, 2-7 modulation obtained by the modulator 22, which modulates the recording data applied by the error correction part 35 (to be described later) during information recording. For example, 2-7 modulated data are converted into suitable signals. The laser controller 21 and the modulator 22 operate in synchronization with the write clock signal applied from the PLL 41 (to be described later). The photodetector 15 generates a reproduction signal according to the amount of light of the laser beam reflected from the optical disc 1, and outputs the reproduced signal according to the amount of the laser beam inputted by the focus controller 23, the tracking controller 25, the linear motor controller 27, the spindle motor controller 29, and the data recording / reproducing signal processor 40. Is applied.

The focus control unit 23 detects the degree of focus of the laser beam from the applied reproduction signal, and applies the operating power to the focus coil 11b to control the laser beam focus of the optical head 10 to adjust the focus normally. The tracking controller 25 detects a tracking error signal from the applied reproduction signal, applies an operating power to the tracking coil 11a for the normal tracking operation, and checks the rotational speed of the optical disc 1 from the reproduction signal. Apply the control signal accordingly. The linear motor controller 27 controls the linear motor 20 by detecting the moving speed of the optical head 10. On the other hand, a D / A (Digital to Analog) converter 33 is provided for exchanging information between the focus control unit 23, the tracking control unit 25, the linear motor control unit 27, and the central processing unit (CPU) 30 which controls the overall control of the optical disk device. The spindle motor controller 29 controls the spindle motor 3 to control the optical disk 1 to rotate at a constant linear velocity (CLV).

The data recording / reproducing signal processing section 40 reproduces the recorded data by receiving the reproduction signal, applies the reproduced data to the error correction unit 35, or performs a process for recording the data. The error correction unit 35 corrects an error by referring to an ECC code or the like among the reproduction data, or adds an ECC code to the memory 31 to be recorded from an external device such as a host through the interface unit 37 and transmits it to the memory 31. The data transferred to the memory 31 is temporarily stored and sequentially applied to the modulator 22 to be recorded on the optical disc 1. The memory 31 also stores the overall operating program of the CPU 30. The CPU 30 controls the overall operation of the optical disk device, and in particular, controls to search or track the correct position for recording or reading information on the disk.

The data recording / reproducing signal processor 40 may include a PLL 41, an optical disk encoder / decoder (ODE) 43, and an optical disk controller (ODC) 45. ODC 43 performs the overall operation of data recording and playback, plays back data via PLL 41, ODE 4, and interfaces with CPU 30, memory 31 and error correction 35.

In the ODC 45, an apparatus according to an embodiment of the present invention for detecting a SYNC signal in the SYNC region as shown in FIG. 2 may be configured. This will be described in more detail with reference to the accompanying drawings.

4 is a block diagram of an apparatus for detecting synchronization information according to an embodiment of the present invention. Referring to FIG. 4, the apparatus for detecting synchronization information according to the present invention includes a SYNC detection unit 50 for dividing and detecting synchronization data in the SYNC region shown in FIG. 2 and detecting IDSYNC region information from the reproduction data. Selects one of an IDSYNC detector 53, an IDSYNC generator 51 for generating an IDSYNC region detection signal according to a feature of the present invention, an IDSYNC generator 51, and an output signal of the IDSYNC detector 53 for outputting a final IDSYNC region detection signal A multiplexer (MUX) 57 and a DATAID detector 59 for detecting a DATAID region as shown in FIG. 2 in reproduction data in accordance with the signal output from the multiplexer 57. FIG.

Hereinafter, the operation of the synchronization information detecting apparatus will be described in detail with reference to FIGS. 4 and 5. 5 is an output signal waveform diagram of each component of the synchronization information detection device of FIG. 4.

The SYNC detection unit 50 receives the reproduction data and detects the information recorded in the SYNC area. The SYNC detection unit 50 divides the data recorded in the SYNC area based on a control signal (CPU-COM) applied from the CPU 30 according to the characteristics of the present invention. To detect. In general, the synchronization information recorded in the SYNC area is composed of a specific code of 3 bytes, that is, 48 channel bits. For example, the synchronization information may be formed of a code of "0100 0010 0100 0010 0010 0010 0100 0100 1000 0010 0100 1000". The SYNC detection unit 50 generates a synchronization code detection signal SYNC when detecting the synchronization code. In the related art, when a part of the synchronization code is damaged due to a defect or the like, and the synchronization code cannot be detected accurately, the synchronization code detection signal is not generated. However, in one embodiment of the present invention, the code division control signal is applied from the CPU 30. The code of 48 channel bits is divided into a plurality of pieces. That is, when the control signal for dividing the synchronization code by 8 channel bits is received from the CPU 30, the synchronization code is divided into 6 by 8 channel bits. Thereafter, not only when all of the divided synchronization codes are correctly detected, but also only a part of the divided synchronization codes is correctly detected according to a feature of the present invention, thereby generating a synchronization code detection signal. This is to enable the generation of the synchronization code detection signal even when the synchronization code is partially damaged due to defects or the like. How many channel bits are divided by the synchronization code and how many or more of the divided synchronization codes are correctly detected and whether to generate the synchronization code detection signal are appropriately set and programmed in advance.

In addition to the synchronization code detection signal SYNC, the SYNC detection unit 50 generates a window signal IDWIN for designating an effective range in which the IDSYNC region is expected to be located when the synchronization code is detected. Referring to FIG. 5, (a) SYNC of FIG. 5 is a synchronization code detection signal, which is illustrated by three pulses. Since one synchronization code detection signal is generated for each sector, it is illustrated that an accurate synchronization code detection signal for three sectors is generated according to a feature of the present invention. The window signal IDWIN shown in Fig. 5D is generated by the predetermined edges 1, 2, and 3 of the pulse waveform of the synchronization code detection signal. The range of the generation period of the window signal IDWIN may also be appropriately set based on the control signal applied from the CPU 30. The synchronization code detection signal SYNC and the window signal IDWIN are applied to the IDSYNC generator 51 and the IDSYNC detector 53.

The IDSYNC detection unit 53 is also provided in the conventional synchronization detection device. When the IDSYNC area is detected based on the applied synchronization code detection signal SYNC and the window signal IDWIN, the IDSYNC area is detected. The IDSYNC detection signal IS2 is generated. As shown in FIG. 5C, the output signal of the IDSYNC detecting unit 53 is generated when the IDSYNC region is detected in the reproduction data. Is illustrated. The IDSYNC generation unit 51 is provided according to the feature of the present invention. When the synchronization code detection signal SYNC is applied from the SYNC detection unit 50, the IDSYNC generation unit 51 generates an arbitrary IDSYNC region detection signal IS1 based on this. This is to solve the problem that the synchronization code detection signal is generated by detecting the synchronization code, but the IDSYNC area detection signal may not be generated in the IDSYNC area due to a defect or the like. As shown in (b) IS1 in FIG. 5, the output signal of the DISYNC generation unit 51 is randomly set by the predetermined edges ①, ②, and ③ of the pulse of the synchronization code detection signal, which is the (a) SYNC signal of FIG. Generating an area detection signal is illustrated.

The multiplexer 57 has a function of selecting and outputting one of the IDSYNC generation unit 51 and the IDSYNC region detection signals S1 and S2 output from the IDSYNC detection unit 53. In this case, the control signal for selection may use the IDSYNC region detection signal output from the IDSYNC detection unit 53. That is, when the IDSYNC detector 53 detects the IDSYNC region, the signal corresponding thereto is applied to the multiplexer 57 so that the output of the multiplexer 57 is selected as the signal output from the IDSYNC detector 53. Finally, when the IDSYNC detection unit 53 detects the IDSYNC area, the multiplexer 57 outputs the IDSYNC area detection signal IS2 output from the IDSYNC detection unit 53 as the final output signal IDSYNC, and when the IDSYNC detection unit 53 does not detect the IDSYNC area. The IDSYNC area detection signal IS1 output from the IDSYNC generation unit 51 is output as the final output signal IDSYNC. Referring to FIG. 5, as shown by (e) IDSYNC of FIG. 5, the first pulse ⑦ becomes the output waveform of the IDSYNC detector 53, that is, the pulse ⑤ of IS2, and the second pulse ⑧ detects the IDSYNC region from the IDSYNC detector 53. If not, the output waveform of the IDSYNC generation unit 51, that is, the pulse ④ of IS1, and the third pulse ⑨ is the output waveform of the IDSYNC detection unit 53, that is, the pulse ⑥ of ID2. The final output signal IDSYNC output from the multiplexer 57 is applied to the DATAID detector 59.

The DATAID detection unit 59 has a function of receiving reproduction data and reproducing the DATAID information in which the DATAID area is detected. The DATAID detection unit 59 correctly knows the DATAID area by the applied signal IDSYNC and accordingly reproduces the DATAID information (FIG. 5F DATAID).

With the above configuration and operation, it is possible to obtain more reliable reproduction data not only under the synchronization code but also under the influence of the defect in the IDSYNC area and the like.

Meanwhile, in the synchronization information detecting apparatus according to the embodiment of the present invention, an IDSYNC generator 51, an IDSYNC detector 53, and a multiplexer 57 are provided to generate an IDSYNC region detection signal. However, in another embodiment of the present invention, IDSYNC is provided. Various modifications can be made without departing from the scope of the present invention, including the provision of only one generation unit 51.

The invention is also applicable to an apparatus including a circuit for detecting synchronization information of a special pattern for synchronization with recorded data, for example, a hard disk drive.

As described above, the present invention divides and reproduces a reproduction data pattern for synchronization information for synchronizing reproduction data into a plurality of preset pieces when reproducing data recorded in an information recording sector of an optical disc. If more than a preset number of data patterns is normally played back, it is determined that all synchronization information has been normally detected, and a synchronization signal for synchronizing with the DATAID area in which the information of the data area is recorded is determined to have been properly generated after determining that the synchronization information has been detected. Therefore, there is an advantage in that the synchronization information of the recorded data can be accurately detected, and the correct data reproduction operation can be performed when the recorded data is reproduced.

Claims (8)

A synchronization data detection method for confirming detection of a synchronization data pattern recorded in the disc in advance for synchronization with the recorded data when reproducing the recorded data in a rotating data recording disc, Detecting the synchronization data pattern by dividing the synchronization data pattern into a predetermined plurality; Confirming whether the divided patterns of the synchronization data pattern detected by dividing the predetermined number are normal patterns, respectively; Even when a part of the synchronization data pattern is damaged, if the number of normal patterns among the divided patterns is greater than or equal to a predetermined number in order to confirm the detection of the synchronization data pattern, the process of determining that the normal detection of the synchronization data pattern is performed. Synchronization data detection method characterized in that. The method of claim 1, wherein the disc is an optical disc. A data area for recording user data on a rotating information storage disk, a synchronization area for recording a synchronization pattern for synchronization of data recorded in the data area, a data information area for recording information about the data area, and When reproducing the data recorded in a data recording format including a data information synchronization area in which synchronization information indicating the start of a data information area is recorded, if the synchronization area is detected and the synchronization area is normally detected, the data information synchronization area is detected. A synchronization information detecting method for detecting the data information area when the data information synchronization area is detected normally. Detecting and dividing a synchronization pattern recorded in the synchronization area into a predetermined plurality when the detection of the synchronization area; Checking whether the divided patterns of the synchronization pattern detected by dividing into the predetermined plurality are normal patterns, respectively; And determining that the synchronization area is normally detected when the number of normal patterns among the divided patterns is greater than or equal to a predetermined number in order to normally detect the synchronization area even when a part of the synchronization pattern is damaged. Synchronization information detection method characterized in that. The method of claim 3, When it is determined that the synchronization area is normally detected to detect the data information area even when the data information synchronization area is damaged, the data information synchronization area is detected even when the data information synchronization area is not normally detected. The method of detecting synchronization information, further comprising the step of determining. 4. The method of claim 3, wherein the disc is an optical disc. At the time of reproduction of the data recorded in the data recording format including a data area for recording user data on a rotating information storage optical disc and a synchronization area for recording a synchronization pattern for synchronization of data recorded in the data area. In the synchronization information detecting method for generating the synchronization pattern detection signal when the area is detected and the synchronization pattern recorded in the synchronization area is normally detected. Detecting the synchronization pattern by dividing the synchronization pattern recorded in the synchronization area into a predetermined plurality; Checking whether the divided patterns of the synchronization pattern detected by dividing into the predetermined plurality are normal patterns, respectively; And determining that the synchronization area is normally detected when the number of normal patterns among the divided patterns is greater than or equal to a predetermined number in order to normally detect the synchronization area even when a part of the synchronization pattern is damaged. Synchronization information detection method characterized in that. A data area for recording user data on a rotating information storage optical disc, a synchronization area for recording a synchronization pattern for synchronization of data recorded in the data area, a data information area for recording information about the data area, and Synchronization for detecting the synchronization area, the data information synchronization area, and the data information area when reproducing the data recorded in a data recording format including a data information synchronization area in which synchronization information indicating the start of a data information area is recorded. In the information detection apparatus, Even when a part of the synchronization pattern is damaged, in order to normally detect the synchronization area, the synchronization pattern recorded in the synchronization area is detected by dividing the synchronization pattern recorded in the synchronization area into a predetermined number, and divided into the predetermined number. A synchronization detection unit for determining that the normal detection of the synchronization area is performed when the number of normal patterns among the divided patterns of the synchronization patterns detected by the detection is greater than or equal to a predetermined number; When it is determined that the synchronization area is normally detected to detect the data information area even when the data information synchronization area is damaged, the data information synchronization area is detected even when the data information synchronization area is not normally detected. And a data information synchronization detector for determining. 8. The apparatus of claim 7, wherein the optical disc is a digital video disc (DVD-RAM) or a digital versatile disc (random access memory).

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