KR20080072336A - Method for executing auto adjustment in a dvd system - Google Patents

Abstract

A method for executing auto adjustment in a DVD recording/playing system is provided to measure PI/PO(Parity Inner Code/Parity Outer Code) values in a predetermined area of the optical disk and to carry out auto adjustment when the PI/PO values are less than a pre-set reference level so as to confirm that the reproduction is stable. A method for executing auto adjustment in a DVD recording/playing system comprises: checking whether an optical disk is inserted(S200); moving the optical pickup to the initial position for recording or reproducing the optical disk by turning on a servo part(S202); measuring PI/PO values in the area of the optical disk where the optical pickup is placed(S204); judging whether the PI/PO values are less than a reference level(S206); moving the optical pickup to another area of the optical disk by driving a sled motor(S208); carrying out adjustment of the optical disk(S210); and standing by a reproducing or recording command with respect to the optical disk(S212).

Description

How to perform auto adjustment in DVD / recording system {METHOD FOR EXECUTING AUTO ADJUSTMENT IN A DVD SYSTEM}

1 is a detailed block diagram of a DVD recording / playback system to which an embodiment of the present invention is applied;

2 is a flowchart illustrating an operation of performing auto-assessment in a DVD recording / playback system according to an exemplary embodiment of the present invention.

<Brief description of the major symbols in the drawings>

100: optical disk 102: optical pickup

104: SLM 106: SPM

108: motor drive unit 110: RF unit

112: servo section 114: DSP section

116 control unit 118 video decoder

120: audio decoder 126: memory section

124: key input unit 122: PI / PO detection unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital versatile disk (DVD) recording / playback system, and more particularly to a method of stably performing auto adjustment regardless of the recording quality of an optical disk in a DVD recording / playback system.

In general, a DVD recording / reproducing system refers to a device for reproducing and displaying data recorded on optical discs such as DVDs and HD-DVDs, in which not only CDs (Compact Discs) but also high-density data are recorded compared to CDs. Of the optical discs reproduced in a DVD recording / reproducing system, a DVD disc can record data at a higher density than a CD, and has various functions as compared to conventional video media by various additional data as well as image quality.

In the DVD recording / reproducing system as described above, when an optical disc such as a CD or a DVD that can be reproduced in the system is inserted, an auto-assessment algorithm for data recording or reproducing of the optical disc is performed. In this case, the auto-assessment basically refers to an operation performed before data recording or reproducing of the optical disc for stabilization of the system such as offset adjustment or focus balance.

On the other hand, in general, optical discs may have poor recording quality due to scratches or the like due to misalignment of focus bias or inadequate handling during use. As described above, optical discs having poor recording quality may be inserted. When the auto-assessment is performed in the installed state, there is a problem in that the accurate auto-assembly for the corresponding optical disc cannot be performed.

In other words, when performing the auto-assessment in the manufacturing process of the product on the optical disc or in the area where the recording quality problem occurs during use, the auto-assessment for recording / reproducing the optical disc due to the defect of the specific area on the optical disc. The value is obtained with an incorrect result value, which causes a problem in recording / reproducing data on the optical disc.

It is therefore an object of the present invention to provide a method for stably performing auto adjustment regardless of the recording quality of an optical disc in a DVD recording / playback system.

In order to achieve the above object, the present invention provides a stable auto-assessment method in a DVD recording / reproducing system, comprising the steps of: (a) turning on a servo operation upon insertion of an optical disc; and (b) Measuring PI / PO in a specific area on the optical disk where the optical pickup is located; and (c) when PI / PO measurement value in a current area on the optical disk where the optical pickup is located is less than or equal to a preset reference level. (D) if the PI / PO measurement value is equal to or greater than the reference level, moving the position of the optical pickup to another area on the optical disk while performing the PI / PO for performing the auto-assessment; And performing the measurement again.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

1 shows a detailed block diagram of a DVD recording / playback system to which an embodiment of the present invention is applied. Hereinafter, the operation of the DVD recording / playback system will be described in detail with reference to FIG. 1.

First, the optical pick-up 102 incorporates an actuator for focusing and tracking, and reads out a recording signal from an optical disc 100 such as a CD or DVD disc.

The sled motor (SLM) 104 moves the optical pickup 102 to an arbitrary position on the optical disk 100. Spindle motor (SPM) 106 drives the optical disk 100 in rotation. The RF unit 110 converts the high frequency optical signal output from the optical pickup 102 into an electrical binary signal by filtering the filter, extracts the servo signal and modulated data for performing the servo, and applies the servo signal to the servo unit 112. .

The digital signal processor (DSP) unit 114 reconstructs the binary signal into original compressed data using its own clock phase-locked to a binary signal applied from the RF unit 110, and then divides the binary signal into data types and connects the video to the rear end. A video decoder 118 and an audio decoder 120 are respectively applied.

The video decoder 118 and the audio decoder 120 decode the compressed video / audio data applied from the DSP unit 114 and convert the decoded video / audio data into an image and an audio signal.

The motor drive unit 108 rotates the optical disc 100 by applying an appropriate driving voltage to the spindle motor 106 under the control of the servo unit 112, and also the thread motor 104. The optical pickup 102 is moved by applying an appropriate driving voltage to the. The servo unit 112 receives information necessary for servo control from the RF unit 110 and controls the driving of the motor drive unit 108 to perform stable servo.

The memory unit 126 stores various operation program data necessary for the operation of the controller 116, and temporarily stores data generated according to the operation of the controller 116.

The key input unit 124 includes a plurality of numeric keys and function keys for controlling the operation of each sub-unit of the DVD system. The key input unit 124 generates corresponding key data and inputs the key data to the controller 116. A parity inner code (PI) / parity outer code (PO) detector 122 detects an error rate of data reproduced or recorded by the optical pickup 102 in a data track on the optical disc 100.

The controller 116 controls the overall operation of the entire DVD system and controls the DSP unit 114, the RF unit 110, and the optical pick-up 102 according to a user's key input. Record or play back data. In addition, the control unit 116 measures the PI / PO in the corresponding area on the optical disk on which the optical pickup 102 is located, when the optical disk is inserted according to an embodiment of the present invention, and then the measured PI / PO value is set to a preset standard level. By performing the auto-assessment when the level is less than or equal to the level), the control is performed to enable more stable auto-alignment to the optical disc 100.

FIG. 2 is a flowchart illustrating an operation control flow that more stably performs auto-adjustment regardless of the recording quality of a DVD disc in the DVD recording / reproducing system according to an exemplary embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

First, when an optical disc for recording or reproducing CD, DVD, etc. in a loader of a DVD recording / reproducing system is inserted, the controller 116 recognizes the insertion of the optical disc in step S200, and the servo unit (S202) in step S202. The operation of 112 is " on " to cause the optical pickup 102 to be moved to an initial position for recording or reproduction on the optical disc 100. FIG.

Subsequently, after moving the initial position of the optical pickup 102 as described above, the control unit (contrary to the conventional method of performing the auto-assessment immediately on the optical disc 100 in which the optical pickup 102 is located without checking whether a corresponding region is defective) is performed. In step S204, the PI / PO value is measured in a corresponding area on the optical disc 100 in which the optical pickup 102 is located.

The PI / PO measurement means measuring a data error rate in a specific area on the optical disc 100. In the present invention, the PI / PO measurement is performed in the area on the optical disc 100 where the optical pickup 102 is located before performing the auto-assessment. The PO measurements were checked with the PI / PO reference level set by each optical disk manufacturer to determine the disk status of the area in advance to determine whether to perform auto-assessment.

That is, the controller 116 determines whether the PI / PO measurement value of the corresponding area on the optical disc 100 where the optical pickup 102 measured in step S204 is greater than or less than the PI / PO reference level value. In step S206).

As a result of the determination in step S206, when the PI / PO measurement value in the corresponding area on the optical disk 100 where the optical pickup 102 is located is larger than the PI / PO reference level value, the controller 116 may select the optical pickup ( When it is determined that the auto-assessment performance is not appropriate in the region where 102 is currently located, the flow proceeds to step S208 to drive the sled motor 104 to change the position of the optical pickup 102 on the optical disk 100. After moving to the area, the process proceeds to step S204 to perform the PI / PO measurement again. At this time, the position shift of the optical pickup 102 is performed until the PI / PO measurement value in the area on the optical disc 100 where the optical pickup 102 is located is measured to be below the reference level (S204) to (S208). The control is performed to repeat the step.

However, in contrast, as a result of the determination in step S206, when the PI / PO measurement value in the corresponding area on the optical disc 100 where the optical pickup 102 is located is smaller than the PI / PO reference level value, the controller 116 It is determined that there is no problem in performing the auto-assessment in the area where the optical pickup 102 is currently located, and the process proceeds from step S206 to step S210 to perform the auto-assembly of the inserted optical disc 100. Will be performed.

Then, when the auto-assessment is completed, the control unit 116 waits for a playback or recording operation command for the inserted optical disc 100 in step S212.

As described above, in the present invention, in the DVD recording / playback system, when the optical disc is inserted, the PI / PO is measured in the corresponding area on the optical disc where the optical pickup is located, and then the measured PI / PO value is measured to be equal to or less than a preset reference level. In this case, by performing the auto-assessment, it becomes possible to perform a more stable auto-assembly for the optical disk.

Meanwhile, the embodiments of the present invention described above have been described in detail, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

As described above, according to the present invention, in the method of performing auto-assessment in a DVD recording / reproducing system, when the optical disc is inserted, the PI / PO measured after measuring the PI / PO in the corresponding area on the optical disc where the optical pickup is located. When the value is inspected below a predetermined reference level, the auto-assessment is performed, thereby making it possible to perform a more stable auto-alignment for the optical disc, thereby increasing the reliability of the recording or reproducing operation of the optical disc. .

Claims (2)

(a) turning on the servo operation upon insertion of the optical disc, (b) measuring PI / PO in a specific area on the optical disk where the optical pickup is located according to the servo operation; (c) performing auto-adjustment when the PI / PO measurement value in the current area on the optical disk on which the optical pickup is located is equal to or less than a preset reference level; (d) if the PI / PO measurement value is equal to or greater than the reference level, performing PI / PO measurement again for performing the auto-adjustment while moving the position of the optical pickup to another area on the optical disk; Auto-assessment method in a DVD recording / playback system comprising a. The method of claim 1, In step (d), the position shift of the optical pickup is repeatedly performed until the PI / PO measurement value in the area on the optical disk where the optical pickup is located is measured below the reference level. How to perform auto test in recording / playback system.

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