KR20040082749A - Methode for optical disc record/playback - Google Patents

Abstract

PURPOSE: A recording/reproducing method of an optical disk is provided to determine the first sampling section from a reproduction power, and to determine the second sampling section while setting an optimum recording power to compare the two sections, then to search an optimum sampling section, thereby increasing recording stability. CONSTITUTION: A system confirms whether an optical disk is inserted(10S), tentatively records the optical disk at a reproduction power(20S) to change a sampling section, and measures a valid rate(30S). The system sets an OPC(Optimum Power Control) function(40S), and determines the second sampling section by using the first sampling section(50S). The system compares the first sampling section with the second sampling section, and re-measures the first sampling section if an OK rate is less than a certain level(70S). If the OK rate is more than the certain level, the system determines the second sampling section as an optimum sampling section(80S).

Description

Optical disc record playback method {Methode for optical disc record / playback}

The present invention relates to an optical disc recording and reproducing method, and more particularly, to an optical disc recording and reproducing method capable of stabilizing recording by measuring and determining an optimum sampling interval.

Generally, recordable optical discs such as DVD-RAM (Digital Versatile Disc-RAM) are provided with concentric or spiral tracks (groove tracks / land tracks). User data is recorded in the track. The method of recording information on the optical disc includes the constant linear velocity (CLV) method of recording information at a constant bit rate as the rotational speed of the optical disc changes according to the position of the track, and at the innermost circumference regardless of the position of the track. The Constant Angle Velocity (CAV) method, which records information at a constant bit rate while maintaining a constant rotation speed to the outermost circumference, is widely known.

Such a rewritable optical disc (for example, a DVD-RAM) records a lead-in area, a lead-out area, and actual data as shown in FIG. The data area is divided into zones, and the data area is divided into zones and managed.

At this time, in order to record / read user data using the optical pickup apparatus, the pickup apparatus should be able to move freely to a desired position. For this purpose, the addressing information is recorded on the optical disc 10. Here, the "addressing information" refers to "identification information given to each unit recording block when the track is divided into a plurality of unit recording blocks". The unit recording block of the DVD-RAM is a sector and the unit recording block of the DVD-RW is one ECC (Error Correction Code) block.

Therefore, such a conventional optical disk can record address information by wobbling in response to the addressing information.

Fig. 2 is a partial plan view of a conventional optical disc, in which a track 11 (land track and / or groove track), which is a user data area, is formed. The wobble signal 12 is recorded in the track 11 by using the change in the amplitude direction.

Here, the wobble information at the time of recording can be obtained by sampling in the land area during the continuation of the Pit-land pattern.

In this case, the wobble signal 12 is used as a means for controlling the disc at a predetermined rotation speed and obtaining a recording clock signal or a reproduction clock signal during recording / reproduction.

Although not shown, a predetermined area of each sector is provided with a header area in which header information is recorded as pre-pits. The pickup device provided in the recording / playback apparatus can be easily moved to a desired position through the addressing information recorded in the header area. In addition, the sector number, sector type, information track, and the like can be recognized, and servo control can be performed.

Therefore, in the conventional optical disc recording / reproducing method, a section for sampling sampling the disc's standard recording speed degree is determined on the firmware (Firm Ware).

For example, FIG. 3 is a diagram illustrating a sampling period according to a conventional recording pulse. In the conventional optical disc recording and reproducing method, light generated after the applied data is modulated by EFM (Eight to Fourteen Modulation) is optically modulated. It can be seen that the sampling section 20 according to the recording RF (Radio Frequency) overlaps with the noise part from the optical disc recorded by the laser beam radiated from the laser beam according to the pulse.

However, the conventional optical disc recording and reproducing method has the following problems.

In the conventional optical disc recording and reproducing method, firmware may be updated according to the specifications of various types of optical discs, or the wobble information may not be sampled smoothly according to the speed, which may cause recording failure.

The present invention is to solve the above problems, test recording in the playback power and measuring the first sampling interval, and after measuring the second sampling interval of the optimal power setting process using the first sampling interval, An object of the present invention is to provide an optical disc recording and reproducing method that can prevent recording and reproduction defects by determining an optimal sampling interval by comparing the first sampling interval and the second sampling interval.

1 is a view showing the structure of a typical optical disk

2 is a partial plan view of a conventional optical disc.

3 is a diagram showing a sampling interval according to a conventional write pulse.

4 is a flowchart for explaining an optical disc recording and reproducing method according to the present invention;

5 is a view showing a change in sampling interval in the optical disc recording and reproducing method according to the present invention;

Fig. 6 is a diagram showing full-range sampling of the optical disc recording and reproducing method according to the present invention.

Explanation of symbols for main parts of the drawings

30: Sampling section 40: Whole section sampling

The optical disc recording and reproducing method of the present invention for achieving the above object comprises the steps of confirming the retraction of the optical disc, testing and recording the optical disc at the reproduction power, and changing the sampling interval during the test recording to improve the useful efficiency. Determining a first sampling interval after the measuring of the useful efficiency with a predetermined efficiency and setting an optimum power, and using the first sampling interval during the optimal power setting process, After measuring and comparing with each other, the first sampling period is measured again if it is less than a predetermined reference, and if it is more than a predetermined reference, characterized in that it comprises the step of determining the second sampling interval.

In the optical disc recording and reproducing method of the present invention, when the input of the optical disc is confirmed, test recording is performed on the reproduction power to determine the first sampling interval, and the first sampling interval and the second sampling interval are measured by measuring the second sampling interval during the optimal power setting process. By comparing the OK efficiencies of the sampling intervals and determining the optimum sampling interval, stable recording can be performed.

Hereinafter, an optical disc recording and reproducing method of the present invention will be described with reference to the drawings.

4 is a flowchart for explaining an optical disc recording and reproducing method according to the present invention.

As shown in Fig. 4, the optical recording and reproducing method of the present invention first checks the retraction of the optical disc (10S), test-records the optical disc at reproducing power (20S), and changes the sampling interval during the test recording. The useful efficiency is measured (30S).

Here, the optical disc is recorded as multi-pulse or non-multi-pulse at the time of recording by the classification of the recording medium. Sampling information (position to be sampled and sampling time) in the is adjusted, and the sampling section 30 is changed as shown in FIG.

In addition, the measurement of the useful efficiency may be performed by using a Cyclic Redundancy Check (CRC) code that is an Error Correction Code (ECC) of an Absolute Time In Pre-groove (ATIP) that enables physical addressing, or an ATIP useful count (Valid). compare the ratio of count).

Next, after comparing the useful efficiency with a predetermined efficiency, the first sampling section is determined, and the optimal recording power setting for correcting or setting the laser recording power, such as the recording sensitivity of the disk film, the difference in the recording sensitivity due to temperature, laser wavelength variation, etc. OPC: Optimum Power Control (40S).

At this time, the determination of the first sampling interval selects the parameter having the largest ATIP CRC OK or ATPP useful count OK ratio.

When the optimal power is set, the second sampling section is measured and determined by using the first sampling section (50S), and after comparing the first sampling section and the second sampling section with each other, the OK efficiency is lower than a predetermined standard. The first sampling interval is measured again (70S).

At this time, when it is necessary to measure the first sampling section again, the sampling time (the delay and the width of the sampling section) is reduced, and the positions to be sampled (spaces 3 to 11T or 3 to 14) increase.

Finally, when the reference value is equal to or greater than a predetermined reference, the second sampling section is determined as the optimal sampling section to record and reproduce the optical disc (80S).

Therefore, the optical disc recording and reproducing method of the present invention can determine the optimum sampling interval before actual recording by using basic sampling information so as to correspond to the characteristics of various types of optical discs.

FIG. 6 is a diagram illustrating global sampling in the optical disk recording / reproducing method according to the present invention. When the first sampling interval is selected as the global sampling 40, the entire sampling 40 and an arbitrary sampling period, that is, firmware By comparing the sampling intervals, the process of setting the optimum power may be performed and the second sampling interval may be determined.

As a result, the optical disc recording and reproducing method of the present invention determines the first sampling section in the reproduction power, compares each other by determining the second sampling section in the process of setting the optimum recording power, and then finds the optimum sampling section. The stability of the recording can be improved by using the wobble information read in the section.

As described above, the optical disc recording and reproducing method according to the present invention has the following effects.

In the optical disc recording and reproducing method of the present invention, the first sampling section is determined in the reproduction power, the second sampling section is determined and compared with each other in the process of setting the optimum recording power, and then, the optimum sampling section is found. The read wobble information can be used to increase the stability of the recording.

Claims (7)

Checking the insertion of the optical disc, Test recording the optical disc at a playback power; Varying sampling intervals during the test recording and measuring useful efficiency; Comparing the useful efficiency with a predetermined efficiency, determining a first sampling interval, and setting an optimum power; Measuring the second sampling interval by using the first sampling interval during the optimal power setting process and comparing each other, and then measuring the first sampling interval again if it is less than or equal to a predetermined reference, and determining the second sampling interval if it is greater than or equal to a predetermined reference. And recording and reproducing the optical disc. The method of claim 1, And when the first sampling section is selected as the whole-world sampling, comparing the whole-world sampling section with the sampling section on the firmware, proceeding with the optimal power setting process, and determining a second sampling section. The method of claim 1, Optical disk recording and reproduction, characterized in that the sampling time is reduced and the sampling position is increased when the first sampling section is measured again when the first sampling section and the second sampling section are compared with each other during the optimum power setting process. Way. The method of claim 3, wherein And the sampling time is a delay and a width of the sampling section, and the sampling position is a space of 3 to 11 tees (T) or 3 to 14 tees (T). The method of claim 1, And the step of trial recording on the optical disc with reproduction power comprises adjusting sampling information (position to be sampled and sampling time) in the firmware. The method of claim 1, The measurement of the useful efficiency is an optical disc recording and reproducing method, characterized in that the ratio of the Absolute Time In Pre-groove (ATIP) Cyclic Redundancy Check (CRC) OK or the ATIP Valid count. The method of claim 6, And the determination of the first sampling interval is selected as the parameter having the largest ATIP CRC OK or ATIP useful count OK ratio.