KR100331339B1 - Header area protecting method and apparatus for optical disc - Google Patents

Abstract

The present invention relates to a method and apparatus for protecting a header area formed on an optical disc when recording signals on the optical disc. The header area protection method of an optical disc recording apparatus includes a header area detection process for detecting a header area from an RF signal detected by pickup from an optical disc, a recording clock generation process for generating a recording clock, and a state after a predetermined clock has elapsed by counting the recording clock. The recording control signal generation process for generating the recording control signal in which is inverted, the recording stop signal generation process for generating the recording stop signal when the recording control signal occurs in the header area signal section, and the recording laser beam of the pickup according to the recording control signal. A recording control process for controlling the amount of light is provided, and the recording control signal generation process includes a feedback process for controlling the output corresponding to the recording stop signal. Therefore, when the signal is recorded on the optical disc, the present invention has the effect of protecting the header area so that no signal is recorded in the header area of the optical disc.

Description

Header area protecting method and apparatus for optical disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for preventing an error of overwriting a signal in a header portion of an optical disk while recording a signal on the optical disk, for example, in a DVD-RAM system. It can be applied to protecting the header area of the optical disc used.

A DVD-RAM is a system for recording and reproducing a signal on an optical disc. An optical disc used in such a system is divided into a plurality of sectors composed of a header area and a recording area. The header area of the optical disc is an area in which duplicate recording is not allowed in the repetitive recording and reproducing process. On the other hand, the data area of the optical disc is an area in which repetitive recording and reproducing of data is possible, and the repetitive recording function of the DVD-RAM can be made using the data area. However, since the optical disc used in the DVD-RAM is made of a material capable of recording both the header area and the recording area, the recording device should not be overwritten in the header area during repeated recording of the data. Control.

However, when data is actually recorded on a DVD-RAM disk, data may be repeatedly recorded in a header part, which causes a problem that the corresponding sector cannot be used. As a representative factor, first, if the period of the recording clock used to make the write gate to turn on / off the output of the recording laser beam is longer than normal, the data area and the buffer area in the sector are both recorded. Therefore, data may be recorded in the header area of the next sector. Second, due to disturbance or other factors during the recording, a jump may occur to a zone other than the zone currently being recorded, and duplicate header areas may be recorded. Third, a recording clock may be generated by using a fixed crystal (X-tal) that does not absorb a change in the rotational speed of the disk, and an error may occur in which data is repeatedly recorded in the header area even when the rotational speed of the spindle motor is too high.

In addition, in the conventional optical disc recording apparatus, the pulsed noise, which is likely to occur after the header pulse detected by the header region, is recognized as the header region and the data recording is stopped, thereby making it impossible to fully utilize the data region. This often occurred.

Therefore, the present invention prevents the data from being overwritten in the header area when recording data on an optical disc such as a DVD-RAM. In addition, if a narrow noise occurs in a data area other than the header area, it is eliminated to prevent the data area from being mistaken as a header area and to stop recording of data, and also to record in the data area due to the noise generated after the header pulse. An object of the present invention is to provide a method and an apparatus for preventing an interruption.

1 shows a system configuration diagram of an optical disc recording apparatus.

2 shows a system configuration diagram showing a recording control unit of the present invention.

3 is a detailed block diagram of the write control signal generator 22 in FIG.

4 shows a signal waveform diagram according to the present invention.

FIG. 5 is a block diagram showing another embodiment of the write control signal generator 22 in FIG.

6 is a signal waveform diagram related to FIG. 5.

The header area protection device of the optical disc recording apparatus for achieving the above object reads the signal recorded on the optical disc as an RF signal through the pickup, and also changes the amount of light of the recording laser beam emitted from the pickup to correspond to the recording signal. A recording clock used as a reference clock for picking up a signal on an optical disk, a recording control unit (ALPC) for controlling the amount of laser beam emitted from the pickup, a recording control signal generator for controlling the recording controller, and a recording control signal generator. A recording stop signal generation unit for generating a recording stop signal, which is a signal forbidden to generate a recording control signal, and a header area detection unit for detecting a header signal included in the RF signal; It is composed.

The header area detector also slices an upper header signal included in the RF signal to a first voltage level to detect a peak pulse, and slices a lower header signal included in the RF signal to a second voltage level. A bottom detector to detect a bottom pulse, a first window processor to remove narrow pulse noise included in the peak pulse, and a narrow pulse noise to remove narrow pulse noise included in the bottom pulse And an OR gating unit for OR-gating a peak signal, which is an output signal of the first window processing unit, and a bottom signal, which is an output signal of the second window processing unit.

The recording clock generator may be configured using a crystal (X-tal) having a constant frequency, or may be configured using a wobble signal detected from an RF signal.

The recording control signal generation unit includes a counter for counting the recording clock and a count start signal detection unit for initiating a counting operation of the counter, wherein the counter has a predetermined value from the count start signal. Until the first state ("H"), i.e., the writable state, is output, and when the count value reaches a predetermined value, the counter is reset to output the second state ("L"), i.e., the write inhibit state. In addition, the counter is configured to be forcibly reset by the write stop signal and to output a write prohibited state, or "L" state, even before the counter value reaches a predetermined value.

The count start signal detection unit demodulates the RF signal detected through the pickup to detect PID (Physical Identification Data), which is header information, and generates a count start signal from the PID.

The recording stop signal generation unit includes a third window processing unit for suppressing the recording control signal for a predetermined period, and an AND gating unit for AND-gating the signal through the third window processing unit and the header area signal detected by the header area detection unit. It is composed.

In addition, in order to achieve the object of the present invention to read the signal recorded on the optical disk as an RF signal through the pickup, and to change the amount of light of the recording laser beam emitted from the pickup corresponding to the recording signal to record the signal on the optical disk A method of protecting a header area of an optical disc recording apparatus for the same is provided.

The header area protection method of an optical disc recording apparatus according to the present invention includes a header area detection process of detecting a header area from the RF signal detected through the pickup from an optical disc, a recording clock generation process of generating a recording clock, and a recording clock count. To generate a recording control signal that is inverted after a certain clock, and to generate a recording stop signal when a recording control signal occurs in the header area signal section detected in the header area detection process. And a recording control process of controlling the amount of light of the recording laser beam of the pickup in response to the recording control signal, wherein the recording control signal generation process includes a feedback process of controlling the output in accordance with the recording stop signal. Is done.

The header region detection process includes a peak detection process of detecting a peak pulse by slicing an upper header signal included in an RF signal to a first voltage level, and a lower header signal included in the RF signal to a second voltage level. A bottom detection process of slicing bottom pulses by slicing, a first window process for removing narrow pulsed noise included in the peak pulses, and a narrow pulsed noise included in the bottom pulses And an OR gating step of OR-gating a peak signal, which is an output signal of the first window process, and a bottom signal, which is an output signal of the second window process.

The recording clock generation process may generate a recording clock using a crystal (X-tal) having a constant frequency, or may generate a recording clock using a Wobble signal and a PLL circuit detected through pickup. .

The recording control signal generation process includes a counting process for counting the recording clock and a count start signal detection process for generating a signal for starting the counting process, and the counting process is performed until the count value reaches a predetermined value. The first state "H", i.e., the writeable state, is output. When the count value reaches a predetermined value, the output is reset to output the second state "L", i.e., the write inhibited state. In addition, the counting process is forcibly reset by the write stop signal so that the write inhibit state, or "L" state, can be output even before the output value reaches a predetermined value. The recording control signal generation process also includes a feedback process for forcibly resetting the recording control signal by receiving the output of the recording stop signal generation process.

The count start signal detection process demodulates the RF signal detected through pickup to detect PID (Physical Identification Data) included in the RF signal to generate a count start signal from the PID.

The recording stop signal generation process includes: a third window processing process for suppressing the recording control signal for a predetermined period, and an AND for AND-gating the signal passed through the third window processing process and the header area signal detected in the header area detection process. This includes the gating process.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a system configuration diagram of an optical disc recording apparatus according to the present invention. The data of the host computer 16 is input to the data processor 14 through the host interface 15, and the data processor 14 modulates the data input from the host into data suitable for an optical disk recording method such as 8-16 method. The modulated data is outputted to the ALPC 12 which controls the amount of light of the laser beam. ALPC 12 is an abbreviation of Automatic Laser Power Controller. The ALPC 12 changes the amount of light corresponding to data input from the data processor 14 to record data on the optical disc 10 in the form of a laser beam through the pickup 11. As a control unit serves to adjust the light amount of the laser beam irradiated to the optical disk 10 according to the amount of light reflected from the optical disk 10. The RF-AMP 13 sums and amplifies a plurality of signals read from the optical disc 10 through the pickup 11, converts the signals into RF having the form of an eye pattern, and inputs them to the data processor 14. . In addition, the RF-AMP 13 separates the peak pulse and the bottom pulse corresponding to the header information included in the RF signal and inputs them to the data processor 14. The motor driver 18 rotates the spindle holding the optical disc 10 so that the pickup 11 reads the sectors of the optical disc 10 and writes data in each sector. The servo processor 17 generates a control signal for driving the motor driver 18 so that the pickup 11 reads sectors of the optical disc 10 at a predetermined speed and writes data in each sector at a predetermined speed. In order to control the operation of the optical recording apparatus, the microcomputer 19 recognizes the driving command of the user and controls the above-described parts to record the data of the host 16 on the optical disk 10 or recorded on the optical disk 10. The optical recording device is driven to read a signal.

FIG. 2 is a diagram illustrating a system configuration of the data processor 14 in FIG. 1 in more detail. The basic operation is the same as that of FIG. 1, and the same parts as those in FIG. The data processor 20 in FIG. 2 includes a data modulator / demodulator 21 and a write control signal generator 22. As shown in FIG.

Referring to the operation at the time of data recording, the data input from the host IF 15 is input to the data modulator / demodulator 21 and modulated into an appropriate form. As the modulation method used in the DVD-RAM recording method, the 8-16 modulation method is mainly used. The ALPC 12 controls the amount of light of the recording laser beam corresponding to the data 21a output from the data modulator / demodulator 21. Also, the ALPC 12 controls the recording laser beam to be turned on / off in correspondence with the recording control signal 22a. Also, the ALPC 12 controls the amount of light of the recording laser beam so that the amount of light at the time of laser beam On is kept constant in accordance with the amount of light reflected from the optical disk. In the RF-AMP 13, the peak pulse 13b and the bottom pulse 13c are separated from the RF signal read from the optical disc through pickup at the time of recording, and input to the recording control signal generator 22, and the RF signal 13a is Input to data modulator / demodulator 21. The data modulator / demodulator 21 detects PID (Physical Identification Data) from the RF signal 13a, generates a count start signal 21b from the PID, and inputs it to the recording control signal generator 22. The write control signal generator 22 generates a write control signal 22a for controlling the ALPC 12 using the peak pulse 13b, the bottom pulse 13c, and the count start signal 21b.

FIG. 3 shows a detailed block diagram of a preferred embodiment of the write control signal generator 22 in FIG.

The recording control signal generator 22 includes a recording clock counter 31, a recording clock generator 32, AND GATE 33, a peak pulse discriminator 34, a bottom pulse discriminator 35, an OR GATE 36, And a header write inhibiting window generator 37.

The recording clock counter 31 starts counting the recording clock inputted by the count start signal 21b until the counter value reaches a predetermined value, for example, " H " When the counter value reaches a predetermined value, the counter value is reset to output the second state, for example, the "L" state, and the low recording control signal 22a. When the AND GATE output, i.e., the recording stop signal becomes an active state, for example, "H", the output 22a of the recording clock counter 31 is forcibly reset so that the recording control signal 22a is in the second state, for example. For example, it operates to become "L" state.

The recording clock generator 32 is a block for generating a clock that is used as a reference clock of the recording clock counter 31. A fixed clock method using a crystal and a method of generating a recording clock using a wobble signal are used.

The AND GATE 33 performs an AND operation on the header area signal output from the OR GATE 36 and the signal output from the header write prohibition window generator 37, so that the recording signal is active in the signal section determined as the header area. For example, if " H ", a recording stop signal is output, the output of the recording clock counter 31 is forcibly reset to a second state, for example, " L " to prevent writing to the header area.

The OR GATE 36 suppresses the input peak pulse 13b for a period of time t1 to remove the pulsed noise having a width shorter than t1, and the bottom pulse 13c input to the output of the peak discriminator 34. ) Is suppressed for a predetermined period t2 to OR-operate the output of the bottom pulse discriminator 35 to remove pulsed noise having a width shorter than t2 to detect the header area signal. In addition, t1 and t2 can be changed by the specification of a design. For example, if the length of t1 is increased, the characteristic of removing the pulsed noise included in the peak pulse is improved, but if an error occurs in the recording area in the header area, as shown in (k) of FIG. You won't be protected. In addition, when t1 is set to 0, the function of removing the pulsed noise included in the peak pulse is lost, but there is an advantage that the header area can be sufficiently protected in the event of an error in which the recording signal is generated in the header area.

The header write prohibit window generator 37 suppresses the output control signal 22a for a predetermined time t4 so that the recording is stopped by the noise following the header area when the write stop signal is generated in the AND GATE 33. To prevent them. In other words, the use of the data area of the optical disc is improved by improving the phenomenon of stopping recording in the case of non-header area.

4 shows a signal waveform diagram according to the present invention. 4 is a waveform illustrating the improvement of two problems in which the recording control signal is duplicated in the header area and in which noise is included in the RF signal.

FIG. 4A illustrates an RF differential waveform that includes a peak header formed at the top of the RF signal waveform and a bottom header formed at the bottom of the RF signal waveform.

FIG. 4B is an imaginary signal waveform obtained by temporally adding the peak header and the bottom header in FIG. 4A to show the "H" state in the header area.

FIG. 4C illustrates an example in which a noise following the header area is included as a peak pulse detected by comparing the waveform of FIG. 4A with a predetermined reference voltage (Peak Threshold). This process is a process of detecting peak pulses corresponding to the upper header signal from the RF signal.

FIG. 4D is a bottom pulse detected by comparing the waveform of FIG. 4A with a predetermined threshold voltage. This process is a bottom pulse detection process that detects a bottom pulse corresponding to a lower header signal from an RF signal.

FIG. 4E is a waveform illustrating a peak pulse window process in which the peak pulse c is suppressed for a predetermined time t1 in the peak pulse discriminator 34 of FIG. 3. In other words, a waveform having a narrower width than t1 having a pulse width of t3 following the header area is removed through the peak pulse window process.

FIG. 4F is a waveform illustrating a bottom pulse window process in which the bottom pulse d is suppressed for a predetermined time t2 in the bottom discriminator 35 of FIG. 3. As in FIG. 4E, if the bottom pulse d includes a narrower pulse than t2, the bottom pulse d is removed in the bottom pulse window process.

FIG. 4G is an output waveform of the OR GATE 36 of FIG. 3, which is an output waveform of an OR gating process that ORs the waveforms of FIGS. 4E and 4F. In this process, OR calculation is performed on the peak detection process for obtaining the waveform (e) of FIG. 4 from (a) of FIG. 4 and the bottom detection process for obtaining the waveform (f) of FIG. 4 from (a) of FIG. This is done.

Fig. 4H is an imaginary signal waveform showing the case where the recording control signal is duplicated in the third header area. That is, for convenience of description, it is a signal waveform indicating the recording control signal before correction assuming that the output of the AND GATE 33 is not fed back to the recording clock counter 31 in FIG. As mentioned above, the following three factors are representative of such a phenomenon. First, when the period of the recording clock becomes longer than normal, the data area and the buffer area in the sector are both insufficient, and data is recorded in the header area of the next sector. Second, due to disturbance or other factors during the recording, a jump may occur to a zone other than the zone currently being recorded, and duplicate header areas may be recorded. Third, a recording clock may be generated by using a fixed crystal (X-tal) that does not absorb a change in the rotational speed of the disk, and an error may occur in which data is repeatedly recorded in the header area even when the rotational speed of the spindle motor is too high. Due to these factors, in the waveform of FIG. 4 (h), a region in which a recording signal of t1 + t6 simultaneously exists in the third header region is shown. In other words, despite the header area, the signal is provided to the ALPC 12 of FIG. The rising edge of the recording control signal 22a is driven by the count start signal 21b in FIG. 2, and in the state where a certain number of recording clocks are counted through the counting process in the recording clock counter 31 in FIG. Polled. The count start signal is separated from the PID of the RF signal through the start signal detection process, and the write clock is separated from the RF signal through the write clock separation process or generated by the fixed crystal.

4 (i) is a waveform in which the output of the waveform (h) of FIG. 4 is suppressed for a predetermined time t5 through the header write prohibition window 37 of FIG. That is, for convenience of description, a signal indicating the output signal of the header write prohibition window generator 37 in a state where the output of the AND GATE 33 is not fed back to the recording clock counter 31 in FIG. 3. It is a waveform. 4 (j) is a signal waveform showing a recording stop signal before correction assuming that the output of the AND GATE 33 is not fed back to the recording clock counter 31 in FIG. 3 for ease of explanation. Through the header write prohibition window 37, noise existing within the time t5 following the header area shown in Fig. 4C is removed. After AND operation of the header write prohibit window output waveform and the OR GATE output waveform in the AND GATE 33 of FIG. 3, the effect of the noise pulse is excluded in the t5 section subsequent to the header area as shown in FIG. The recording stop signal before correction is obtained. At this time, t3 is less than t1 and t4 must be in a relationship occurring within the time of t5. Through this process, the prohibition of the write prohibition caused by the noise pulse following the header area is increased, thereby increasing the utilization of the data area.

4 (k) shows a signal waveform forcibly resetting the recording control signal 22a when the recording stop signal j is generated by the waveform (j) of FIG. Through this feedback process, the header area is protected during the t6 section to protect the header area. As described above, the section t1 may be set to an appropriate value of zero or more according to the design specification. In other words, if t1 is set to 0, damage to the header area can be minimized when a recording control signal occurs in the header area. In this case, the characteristic of removing narrow noise contained in the RF signal cannot be expected. Increasing t1 gradually increases the damage of the header area when the recording control signal is generated in the header area, and consequently, the narrowing noise removal characteristic included in the RF signal is improved.

FIG. 5 is a block diagram showing another embodiment of the write control signal generator 22 in FIG. Currently, the header signal is not detected due to dust or any cause, but if the disc is well cared for, the header can be detected if it is recorded in the header. In order to protect the header area even when an error occurs in the header signal detection due to the above reasons, the header position predictor 51 and the OR gate 52 are added in the block structure of FIG. Another embodiment is shown. Therefore, the same block as in FIG. 3 uses the same reference numerals, and descriptions overlapping with those in FIG. 3 will be omitted.

In FIG. 5, the recording clock generator 53 is a clock generation block including a fixed clock generator using a crystal and a wobble clock generator using a wobble signal. The recording clock counter 31 according to the embodiment of FIG. 5 can use the fixed clock as the counter input and the wobble clock as the counter input. The header position predictor 51 is a counter configured to count the recording clock supplied from the recording clock generator 53 by the start signal 21b and generate an output when the count value reaches a predetermined value. When the recording clock counter 31 uses the fixed clock, the wobble clock is used as the input clock of the header position predictor 51. On the contrary, when the recording clock counter 31 uses the wobble clock, the header clock of the header position predictor 51 It is configured to use fixed clock as input clock. The above two cases are design specifications that are selectively determined by the designer at the time of product design, and FIG. 5 is used only in one of the two states.

First, the case where the recording clock counter 31 uses the fixed clock as the counter input and the wobble clock as the input clock of the header position predictor 51 will be described. When the recording clock counter 31 uses the fixed clock as a counter input and the rotation speed of the spindle motor is slower than the normal speed, the header area appears after the counter value of the recording clock counter 31 reaches a predetermined value. The recording control signal is generated so as not to record in the area, and the problem of recording in the header area does not occur. However, if an error occurs in peak and bottom pulse detection when the rotational speed of the spindle motor is faster than the specified speed, in the case of the embodiment of FIG. 3 using only the recording clock counter 31, the recording is invaded even in the header area. The embodiment of FIG. 5 adds a header position predictor 51 and an OR gate 52 using the wobble clock as an input clock, so that the rotational speed of the spindle motor is faster than the normal speed and an error occurs in peak and bottom pulse detection. It is configured to prohibit recording in the header area. Since the rotational speed of the spindle motor is reflected in the cycle of the wobble clock, the faster the rotational speed of the spindle motor is, the shorter the time for which the counter value of the header position predictor 51 reaches a predetermined value. The write clock counter 31 is reset through the gate 52 to generate the write control signal 22b so that the write clock counter 31 is not written to the header area.

Next, the case where the recording clock counter 31 uses the wobble clock as an input and the fixed clock as the input of the header position predictor 51 will be described. First, when the recording clock counter 31 uses the wobble clock as an input and the rotation speed of the spindle motor is slower than the normal speed or the cycle of the wobble clock becomes shorter than the normal period, the counter value of the recording clock counter 31 is Since the header area appears after a certain value is reached, a recording control signal is generated so that no recording is made in the header area. Therefore, there is no problem of recording in the header area. However, if an error occurs in peak and bottom pulse detection, if the period of the wobble clock becomes longer than the normal period, the header area appears before the counter value of the recording clock counter 31 reaches a certain value. In this case, in the case of the embodiment of Fig. 3 using only the recording clock counter 31, recording is invaded to the header area. However, the embodiment of FIG. 5 is configured to prohibit writing in the header area even when an error occurs in peak and bottom pulse detection by adding a header position predictor 51 and an OR gate 52 that use a fixed clock as an input. It was. That is, since the time when the counter value of the header position predictor 51 using the fixed clock reaches a constant value is constant, the wobble clock is slowed down before the recording clock counter 31 reaches the constant value. The recording clock counter 31 is configured to be reset by using the output of 51 to generate the recording control signal 22b so as not to be recorded in the header area.

6 is a signal waveform diagram illustrating the operation of FIG. 5.

FIG. 6A is an imaginary waveform indicating a header area, and the dotted line part is a waveform showing a state in which the header part contains a defect due to a defect in the disk.

FIG. 6B shows the detected peak pulse, and the dotted line in the figure is a waveform showing the state where the peak pulse is not detected due to a defect in the header portion of the disc.

(C) of FIG. 6 shows bottom pulses, and (d) and (e) show waveforms whose output is suppressed for a predetermined period in the peak pulse determiner 34 and the bottom pulse 35 determiner, respectively.

6 (f) shows the start signal 21b generated from the PID which is the header information by demodulating the RF signal, and counting the recording clock counter 31 and the header position predictor 51 by the start signal 21b. The operation begins.

Fig. 6G is a waveform showing the header predictive output which is the output of the header position predictor. Counting starts from the time when the start signal is generated, and outputs a header prediction signal when the count value reaches a predetermined value (K). When using the fixed clock as the clock input of the header position predictor 51, t7 and t8 are the same value. When using the wobble signal as the clock input, t7 and t8 reflect the rotational speed of the spindle motor and the time is reduced. The longer and faster the rotation, the longer the time.

FIG. 6 (h) shows the output of the recording clock counter 31 in a state in which the header area is corrected so that the header area is not recorded even when the detection of the peak pulse is omitted by the embodiment of FIG. 5 as the recording control signal 22a. . Section A is a state in which the subsequent header area does not contain a defect and the rotation of the recording clock and spindle is normal, and the recording control signal section t9 ends before the subsequent header area. Therefore, the recording is prohibited in the header area of the disc. Indicates. However, in section B, an error occurs in the subsequent header area detection, and the period of the wobble clock which is the recording clock is longer than the normal period. In this case, the recording control signal section t8 is the header of the g using the fixed clock. The recording control signal is corrected not to record in the header area even in this case by the prediction output.

The apparatus and method described above have the effect of preventing the phenomenon in which the header area at the time of recording is overwritten in the optical disk recording apparatus, and the phenomenon that recording is prohibited in the data area. In addition, even if the header area of the disc is defective, the header area is not duplicated.

Claims (18)

In the process of recording data on the optical disc by adjusting the amount of laser beam irradiated onto the optical disc divided into a header area and a data area, the method of protecting a header area of the optical disc includes: A header area detection process of detecting the header area from the RF signal detected from the optical disc; A recording clock generation process for generating a recording clock; A recording control signal generating step of counting the recording clock and generating a recording control signal in which the state is reversed after a predetermined clock has elapsed; A recording stop signal generation step of generating a recording stop signal when the recording control signal is generated in the header zero detected in the header area detection step; A recording control process of controlling the amount of light of the recording laser beam in response to the recording control signal; And the recording control signal generating step includes a feedback step of controlling an output corresponding to the recording stop signal. The method of claim 1, wherein the header area detection process comprises: A peak detection process of detecting an upper header signal included in the RF signal; A bottom detection process of detecting a lower header signal included in the RF signal; OR-gating an OR operation of the peak signal detected in the peak detection process and the bottom signal detected in the bottom detection process; The header area protection method of an optical disc, characterized in that it comprises a. The method of claim 2, wherein the peak detection process is: A peak pulse detection process of detecting a peak pulse corresponding to the upper header signal included in the RF signal; A first window process of suppressing the peak pulse detected in the peak pulse detection process for a predetermined time to remove noise having a pulse width within a predetermined time included in the peak pulse; The header area protection method of an optical disc, characterized in that it comprises a. The method of claim 2, wherein the bottom detection process is: A bottom pulse detection step of detecting a bottom pulse corresponding to the lower header signal included in the RF signal; A second window process of removing the noise having a pulse width within a predetermined time included in the bottom pulse by suppressing the bottom pulse detected in the bottom pulse detection for a predetermined time; The header area protection method of an optical disc, characterized in that it comprises a. The method of claim 1, wherein the recording clock generation process generates the recording clock using a fixed frequency oscillation crystal. 2. The method of claim 1, wherein the recording clock generation step includes a recording clock separation step of generating the recording clock from the wobble signal detected by the RF signal. The process of claim 1, wherein the recording control signal generation process comprises: A start signal detection process of detecting a count start signal from the RF signal; The counting of the recording clock starts in response to the count start signal separated in the start signal detection process, and outputs a first state until the count value reaches a predetermined value, and the count value is predetermined. A counting process of resetting the output to a second state when the predetermined value is reached; The header area protection method of an optical disc, characterized in that it comprises a. 8. The method of claim 7, wherein the counting step further comprises a reset step for forcibly resetting the counter output corresponding to a result of the write stop signal generation step. The method of claim 1, wherein the recording stop signal generation process is: A third window process of suppressing the write control signal for a predetermined period; An AND gating step of performing an AND operation on the signal whose predetermined period is suppressed by the third window process and the header area signal detected in the header area detection process; The header area protection method of an optical disc, characterized in that it comprises a. An apparatus for recording data on an optical disc by adjusting the amount of light of a laser beam irradiated onto an optical disc divided into a header area and a data area, wherein the header area protection device of the optical disc is: Header area detection means for detecting the header area from the RF signal detected from the optical disc; Recording clock generating means for generating a recording clock; Recording control signal generating means for counting the recording clock and generating a recording control signal in which the state is reversed after a predetermined clock has elapsed; Recording stop signal generation means for generating a recording stop signal when the recording control signal occurs in the header area signal section detected by the header area detection means; Recording control means for controlling an amount of light of the recording laser beam in response to the recording control signal; And the recording control signal generating means is configured to control the output thereof in accordance with the recording stop signal. The method of claim 10, wherein the header area detecting means comprises: Peak detection means for detecting an upper header signal included in the RF signal; Bottom detection means for detecting a lower header signal included in the RF signal; OR gating means for ORing the peak signal detected by the peak detecting means and the bottom signal detected by the bottom detecting means; Header area protection device for an optical disc comprising a. The method of claim 11, wherein the peak detection means is: Peak pulse detection means for detecting a peak pulse corresponding to the upper header signal included in the RF signal; First window means for suppressing the peak pulse detected by the peak pulse detecting means for a predetermined time to remove noise having a pulse width within a predetermined time included in the peak pulse; Header area protection device for an optical disc comprising a. The method of claim 11, wherein the bottom detecting means is: Bottom pulse detection means for detecting a bottom pulse corresponding to the lower header signal included in the RF signal; Second window means for suppressing the bottom pulse detected by the bottom pulse detecting means for a predetermined time to remove noise having a pulse width within a predetermined time included in the bottom pulse; Header area protection device for an optical disc, characterized in that it comprises a. 12. The apparatus of claim 10, wherein the recording clock generating means generates the recording clock using a fixed frequency oscillation crystal. 11. The apparatus of claim 10, wherein the recording control signal generating means is: Start signal detecting means for detecting a count start signal from the RF signal; The counting of the recording clock starts in accordance with the count start signal separated by the start signal detecting means, and outputs a first state until the count value reaches a predetermined value, and the count value is predetermined. Counter means for resetting the output to a second state upon reaching a predetermined value; The header area protection method of an optical disc, characterized in that it comprises a. 16. The apparatus of claim 15, wherein the counter means is configured to forcibly reset the output of the counter means in response to the write stop signal. 11. The apparatus of claim 10, wherein the write stop signal generating means is: Third window means for suppressing the recording control signal for a predetermined period; AND gating means for ANDing the signal whose predetermined period is suppressed by said third window means and the header area signal detected by said header area detection means; Header area protection device for an optical disc comprising a. An apparatus for recording data on an optical disc by adjusting the amount of light of a laser beam irradiated onto an optical disc divided into a header area and a data area, wherein the header area protection device of the optical disc is: Header area detection means for detecting the header area from the RF signal detected from the optical disc; First clock generating means for generating a recording clock; Second clock generating means for generating a clock different from the recording clock; First counter means for counting the write clock to generate a write control signal; Second counter means for counting the output of said second clock generating means and outputting a header position prediction signal when a count value reaches a predetermined value; AND gate means for generating an active output when the recording control signal occurs in the header region signal section detected by the header region detecting means; Write stop signal generating means for resetting the output of the first counter means by using the output of the second counter means and the output of the AND gate means; Recording control means for controlling an amount of light of the recording laser beam in response to the recording control signal; Header area protection device for an optical disc, characterized in that it comprises a.