KR100990654B1 - Method for recording the data on a optical disc using optimum write strategy - Google Patents

Abstract

The present invention relates to an optimal recording method of an optical disc apparatus in which a recording operation is performed by an optimal write strategy for each recording method and recording speed, the method comprising: a first method of determining a recording method at a current recording position when a recording request is made; step; A second step of performing a recording operation with an optimum write strategy corresponding to the current recording speed by referring to the stored write strategy for the determined recording speed according to the determined recording method; And converting a recording method during the recording operation to perform a recording operation with an optimal write strategy corresponding to a current recording speed by referring to the stored write strategy for each recording speed corresponding to the converted recording method. Including the three steps, the recording method and the recording speed according to the optimal WS recording speed is achieved by the optimal recording operation, from which the recording / reproduction quality is a very useful invention.

P-CAV, Write Strategy, CLV, EEPROM, OPC

Description

Method for recording the data on a optical disc using optimum write strategy             

1 shows an example of a P (Partial) -CAV recording method,

2 to 7 show abnormal waveforms by the conventional recording method,

8 is a block diagram of an embodiment of an optical disk device in which an optimal recording method of an optical disk according to the present invention is implemented.

Fig. 9 shows the flow of a preferred embodiment of the optimal recording method of the optical disc according to the present invention.

10 to 13 show normal waveforms by the recording method of the present invention.

[Description of Drawings]

10: optical disc 11: spindle motor

20: optical pickup 30a: digital recording signal processing unit

30b: digital reproduction signal processor 40: channel bit encoder                 

41: optical drive 50: R / F section

60: drive portion 61: servo portion

70: Micom 71: EEPROM

The present invention relates to an optimal recording method of an optical disc apparatus in which a recording operation is performed by an optimal write strategy for each recording method and recording speed.

In general, the memory of the optical disk device (for example, EEPROM) includes a write strategy corresponding to each disk manufacturer (by disk code) and recording speed (for example, 16X, 20X, 24X, 32X). Strategy) is stored in the form of firmware. The WS for each recording speed is a value detected by the recording of the constant linear velocity (CLV) method, which is determined by an experiment in the writing tool. Is detected.

Therefore, in the optical disk apparatus, the optimum recording quality can be obtained by recording by applying CLV_W.S corresponding to each recording speed.

On the other hand, unlike the CLV method of recording at a fixed speed (for example, 16X) as a whole of the disk, the P-CAV method as shown in FIG. 1 has a constant angular velocity (CAV: Constant) in which the recording speed changes every track within a certain speed range. Angular Velocity) method, for example, in the case of 32X P-CAV method, recording is performed in the CAV method up to 32X as shown in FIG. 1, and the recording operation is performed in the CLV method in 32X or more.

Therefore, in the conventional P-CAV recording, the CLV recording section is recorded by applying CLV_W.S stored in the EEPROM. However, for the CAV recording section, the previously detected CLV_W.S is changed to CAV_W.S and recorded.

That is, for the CAV recording interval, CAV_W.S for each recording speed is calculated from the stored CLV_W.S. An example thereof is as follows.

In the above, FG is an output pulse according to the rotation of the spindle motor and is divided into 6 and 12 poles depending on whether the number of output pulses according to one rotation of the spindle motor is 6 or 12. If 6 poles, the number of output pulses per one revolution of the spindle motor is 6.

In addition, 1X is 500rpm at the inner circumference of the optical disc at 0 minutes, so 12000rpm is used for 24X, and 12000rpm / 60 results in 200 revolutions per second of the spindle motor, and 1200 (200 × 6) during 1 second rotation of the spindle motor. It can be seen that the FGs are outputted, and thus the current FG change amount can be detected.

As described above, in the conventional P-CAV recording, CAV_W.S for each recording speed is calculated and recorded for the CAV recording section from the previously detected and stored CLV_W.S. In this case, a specific disk (for example, 2T For Ultra RW discs, the following problems occur when recording P-CAV (eg 32X).

First, disc recognition and error correction are difficult due to the occurrence of C2 errors in the inner portion of the disc as shown in FIGS. 2 and 3, and 3, 5, 7, 9, 11T and 2, 4, as shown in FIGS. There is no interval division of 6, 8 and 10T.

Therefore, a problem arises in that the waveform in the 16X to 32X CAV recording section is distorted due to the problem of the inner circumference of the disc, which is the CAV recording section.

6 shows a case where only 16X CLV_W.S is changed, and FIG. 7 shows a case where only 32X CLV_W.S is changed. In FIG. 6, disc recognition is possible, but data is about 7 to 40 minutes. It is difficult to read, and in the case of FIG. 7, disc recognition is not possible, and C2 errors generally occur, and data reading is difficult, resulting in deterioration of recording / playback quality of the optical disc.

Therefore, the present invention was created to solve the above problems, and in addition to the CLV_W.S for each recording speed in consideration of the P-CAV recording method, CAV_W.S is further detected and stored, and the optimum for each recording method and recording speed. It is an object of the present invention to provide an optimal recording method for an optical disc by which the recording is performed by applying the WS, thereby improving the recording / reproducing quality of the optical disc.

According to an aspect of the present invention, there is provided an optimal recording method of an optical disc, comprising: a first step of determining a recording method at a current recording position when a recording request is made; A second step of performing a recording operation with an optimum write strategy corresponding to the current recording speed by referring to the stored write strategy for the determined recording speed according to the determined recording method; And converting a recording method during the recording operation to perform a recording operation with an optimal write strategy corresponding to a current recording speed by referring to the stored write strategy for each recording speed corresponding to the converted recording method. It is characterized by three steps.

Hereinafter, a preferred embodiment of an optimal recording method of an optical disc according to the present invention will be described with reference to the accompanying drawings.

FIG. 8 shows a configuration of a preferred embodiment of an optical disk device in which an optimal recording method of an optical disk according to the present invention is implemented. The digital recording converts the recording format by adding an error correction code (ECC) to the input digital data. A signal processor 30a; A channel bit encoder (40) for reconverting the data converted into the recording format into a bitstream; An optical driver 41 for outputting a light quantity driving signal according to the input signal; An optical pickup (20) for recording a signal on the optical disc (10) in accordance with the light quantity driving signal and for detecting a recording signal from the recording surface; An R / F unit 50 for shaping the signal detected by the optical pickup 20 and outputting it as a binary signal; A drive unit 60 for driving the optical pickup 20 and the spindle motor 11; A servo unit 61 for controlling the driving of the drive unit 60 from the tracking error signal T.E and the focusing error signal F.E of the optical pickup 20 and the rotational speed of the optical disc 10; A digital reproduction signal processor (30b) for restoring the binary signal to original data with its own clock synchronized with the binary signal; A memory (EEPROM) 71 in which a write strategy (W.S) detected by an experiment by a disc manufacturer (by disc code) and recording speed is stored in a firmware form; And a microcomputer 70 that applies a W.S stored in the EEPROM 71 to perform a recording operation.

In the above configuration, the EEPROM 71 further has CAV_W.S in addition to the CLV_W.S detected by the experiment for each recording speed (e.g., 16X, 20X, 24X, 32X) for each disc code as in the prior art. It is detected and stored. At this time, only CAV_W.S detects and stores only the highest speed (for example, 32X) and the lowest speed (16X) of the optical disk (for example, Ultra RW disk), and CAV_W for other recording speeds. The .S is calculated by the microcomputer 70 using the detected stored CAV_W.S, which will be described later.

FIG. 9 shows a flow of a preferred embodiment of an optimal recording method of an optical disc according to the present invention. Hereinafter, the optimal recording method of FIG. 9 according to the present invention will be described in detail with reference to the configuration of FIG. 8.

First, when the optical disc 10 is inserted and mounted (S10) and driven to rotate, the microcomputer 70 determines the disc code from the optical disc 10. An example thereof is as follows.

To determine the disc code, the microcomputer 70 checks the start time of the lead-out area of the optical disc 10 from table of contents information recorded on the lead-in area of the optical disc 10. The lead-out area is a signal area indicating the end of a program, and a lead-out signal (repetitive pulse of 2 Hz) is recorded from the program end position to an area of 0.5 mm outside the radius of the program. Since the start time is different, the disc code can be determined from this.

In the state where the disc code is determined as described above, when a recording operation is requested (S20), the microcomputer 70 performs an optimal recording operation using CAV_W.S and CLV_W.S stored and detected in the EEPROM 71. For convenience of explanation, it is assumed that it is a 32X P-CAV record.

For reference, in the 32X P-CAV recording, as described above, up to 32X is recorded in the CAV method, and in 32X or more, the recording operation is performed in the CLV method. Otherwise, it is determined whether it is a CLV recording section, and if it is a CAV recording section, the EEPROM 71 detects CAV_W.S corresponding to the determined disc code and a user-set recording speed (for example, 16X). do.

Subsequently, the microcomputer 70 performs the CAV recording operation by applying the detected 16X_CAV_W.S and the optimum recording power detected through the previous OPC operation, which will be briefly described as follows.

First, under the control of the microcomputer 70, while the optical disk 10 is rotationally driven by the 16X CAV method, the digital recording signal processing unit 30a is used for recording / reproducing reliability of the input coded data. Encoding and focus error correction parity is added to generate a focus error correction code (ECC block) and the like, and the channel bit encoder 40 outputs the digital bit stream output from the digital recording signal processor 30a. The optical signal is converted into a pulse width modulated signal for recording on the optical disc 10 and applied to the optical driver 41. The microcomputer 70 outputs a recording signal by an optical driving current corresponding to the detected optimal recording power. The optical driver 41 is controlled to be output. Accordingly, the optical driver 41 outputs a signal for recording data at an optical driving power corresponding to the applied pulse width modulated signal, so that the optical pickup 20 is placed on the data area of the optical disc 10. Data is recorded, but the signal level and duration of the recording pulse at this time are maintained in accordance with the detected 16X_CAV_W.S.

During such a recording operation, the microcomputer 70 determines whether the recording speed is changed. This is because the recording speed is continuously changed in the CAV recording section, so that each time the recording speed is changed or the predetermined speed is changed, the corresponding WS is changed. To detect, apply and record

When the recording speed is changed as a result of the determination, the microcomputer 70 detects CAV_W.S corresponding to the changed current recording speed (for example, 20X), wherein the value 20X_CAV_W.S is the EEPROM 71. The microcomputer 70 calculates CAV_W.S corresponding to the current recording speed 20X by using the 16X_CAV_W.S and 32X_CAV_W.S which are detected and stored in the EEPROM 71. The formula is as follows.

The CAV_W.S corresponding to 24X is calculated as follows.

As described above, the microcomputer 70 performs CAV recording operation by calculating and applying the corresponding CAV_W.S for each recording speed except for 16X and 32X stored in the EEPROM 71 in the CAV recording section. (S21).

On the other hand, the microcomputer 70 determines whether the recording method is converted during the recording operation (S30, S40). As described above, in the case of 32X P-CAV recording, up to 32X is recorded in the CAV method and 32X This is because the above should be recorded in the CLV method.

When the detection result recording method is converted to CLV, the microcomputer 70 detects CLV_W.S corresponding to the current recording speed 32X from the EEPROM 71, and the optimum recording power and the detected 32X_CLV_W. The CLV recording operation is performed by applying .S (S41), and the recording operation continues while maintaining the current recording speed 32X and the WS accordingly until the end of the recording operation (S50, S51).

As described above, in the present invention, in consideration of both CAV recording and CLV recording, the CAV_W.S and CLV_W.S corresponding to each recording speed are detected and stored by experiment, and CAV recording is performed during P-CAV recording later. For the section, the WS for each recording speed is calculated and recorded from the previously detected and stored CAV_W.S. For the CLV recording section, the WS is recorded with the previously detected and stored CLV_W.S.

On the other hand, in the above embodiment, the microcomputer 70 detects and applies the optimum recording optical power corresponding to each change of the recording speed.

As described above, in the present invention, C2 error does not occur in the inner portion of the disc as shown in FIGS. 10 and 11, and thus does not cause any problem in disc recognition and error correction. Clear separation of intervals of 5, 7, 9, 11T and 2, 4, 6, 8, 10T is not a problem in data recording / reproducing at all, even when repeated recording.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

According to the optimum recording method of the optical disk according to the present invention, the CAV_W.S for each recording speed is calculated and recorded from the CAV_W.S previously detected and stored for the CAV recording section during recording in the P-CAV method. By applying the recorded and stored CLV_W.S for the interval, the optimal recording operation is achieved by recording in the optimal WS according to the recording method and the recording speed, and thus the recording / reproducing quality is improved. .

Claims (6)

In the recording method of a recordable optical disc, A first step of determining a recording method at a current recording position when a recording request is made; A second step of performing a recording operation with an optimum write strategy corresponding to the current recording speed by referring to the stored write strategy for the determined recording speed according to the determined recording method; And A third operation of performing a recording operation with an optimal write strategy corresponding to a current recording speed by referring to the stored write strategy detected by the recording speed for the converted recording method when the recording method is converted during the recording operation. Including steps, The pre-detected stored light strategy is stored separately for each recording speed for the CAV and CLV recording methods. The method of claim 1, In the second step, during the recording operation, the recording operation is performed with the optimal light strategy corresponding to the current recording speed by referring to the write strategy that is detected and stored every time the recording speed is changed. Optimal recording method for optical discs. The method of claim 1, The first to third steps are performed by the P (Partial) -CAV recording method. delete The method of claim 1, And the light strategy for the CAV recording method is detected corresponding to the highest and lowest speeds of the apparatus. delete

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