KR20000018625A - Method and apparatus for detecting detrack, method and apparatus for controlling tracking using the same, and disk suitable for the same - Google Patents

Abstract

PURPOSE: A method and an apparatus for detecting a detrack, a method and an apparatus for controlling a tracking using the same, and a disk suitable for the same are provided, which easily detects a detract element using a header signal. CONSTITUTION: A tracking control apparatus comprises: a reproducing signal generator(62) for outputting sum signals (I1, I2), a push-pull signal (RF_pp) as a subtracting signal (I2-I1), and a sum signal (RF_sum) as a sum signal (I1+I2); a header region detector (64) for generating a header section signal from the sum signal (RF_sum); a first synchronizing signal level detector (66) for detecting the level (V1) of a vfo1 signal; a second synchronizing signal level detector (68) for detecting the level (V2) of a vfo3 signal; a balance operating unit (70) for operating a rate of the level (V1) of the first synchronizing signal level detector (66) and the level (V2) of the second synchronizing signal level detector (68); a comparing unit (72) for comparing the balance value (K1) of the balance operating unit (70) with a certain reference value and outputting a subtracting value (Kt); a land/groove detecting unit (76) for detecting as to whether a current track is a land track or a groove track; and a polarity inverting unit (78) for inverting the subtracting value (Kt) of the comparing unit (72). Thereby, it is possible to accurately detect a detrack state of a laser beam.

Description

Detrack detection method and apparatus, tracking control method and apparatus using same, and disc suitable therefor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for detecting a tracking offset component that may occur when a laser beam follows a track in an optical disk apparatus capable of recording / reproducing. Method and apparatus for easily detecting detrack components using header signals in recordable disc structures with pre-pitted headers for discriminating in-sectors A tracking control method and apparatus, and a disk suitable therefor.

In addition to playback-only discs such as DVD-ROMs, as well as recordable discs such as DVD-RAMs, the higher the recording density, the greater the deterioration of signal quality due to the detrack. In particular, recordable discs have a poor recording quality due to the effect of crosstalk with adjacent tracks when a small amount of detrack is present at the time of recording.

Fig. 14A shows a prior art for detrack detection to detect a detrack component by inserting a specific pattern onto a track of the disc. The particular pattern uses at least two pairs of pits 11 and 12 which are arranged in a direction offset from the track direction and the track center.

During recording / reproducing of data, a signal as shown in Fig. 10B can be obtained in a pattern as shown in Fig. 10A. If the laser beam crosses the centerline 13 of the track, then the magnitude 14 of the signal at the leading pit 11 and the magnitude 15 of the signal at the trailing pit 12 as shown in FIG. 10B. ) Is output identically.

However, if the laser beam is detracked at the centerline 13 of the track, the magnitude of the signal 14a at the leading pit 11 and the magnitude of the signal at the trailing pit 12 as shown in FIG. 15a) is changed.

That is, when detracked, the discriminator detecting the waveform of the detected signal determines the direction and magnitude of the detrack by comparing the magnitudes of the signals detected by the preceding pit 11 and the trailing pit 12. Can be.

However, in the prior art as shown in Figs. 14A and 14B, since the pattern to detect the detrack is too short and simply compares the difference between the two signals, the detrack amount may be differently determined by the reflectance of the disk or other factors. And another sync pattern for recognizing positions of the patterns for detrack detection.

It is a first object of the present invention to provide a method for detecting the amount of detrack using a header signal recorded on a disk, which is devised to solve the above problems.

A second object of the present invention is to provide a tracking control method to which the above-described detrack detection method is applied.

A third object of the present invention is to provide an apparatus suitable for the above-described detrack detection method.

It is a fourth object of the present invention to provide an apparatus suitable for the above tracking control method.

A fifth object of the present invention is to provide a disk suitable for the above method and apparatus.

FIG. 1A shows the physical shape of the land track, and FIG. 1B shows the waveform of the push-pull signal in the land track.

2A shows the physical shape of the groove track, and FIG. 2B shows the waveform of the push-pull signal in the groove track.

3 is an enlarged view of the header area illustrated in FIGS. 1A to 2A.

4A and 4B show a push-pull signal and a sum signal obtained when the laser spot passes through the header section of the groove track, respectively, in FIG. 3.

FIG. 5 shows the configuration of a device for obtaining the push-pull signal shown in FIG. 4.

6 is a block diagram showing the configuration of an embodiment of a tracking control device according to the present invention.

7 (a) to 7 (e) are waveform diagrams showing the operation of the apparatus shown in FIG.

8 is a block diagram showing the configuration of another embodiment of a tracking control device according to the present invention.

9 (a) to 9 (b) are waveform diagrams showing the operation of the apparatus shown in FIG.

FIG. 10 is a diagram illustrating a peak-peak detector used in the first synchronous signal level detector shown in FIG. 6, the second synchronous signal level detector, and the mirror signal level detector shown in FIG.

FIG. 11 is a diagram illustrating a low pass filter used in the first synchronous signal level detector shown in FIG. 6, the second synchronous signal level detector shown in FIG. 8, and the mirror signal level detector shown in FIG. 8.

FIG. 12 shows the result of sampling the signal provided from the low pass filter of FIG. 11.

13 is a detrack amount and a balance value in the method and apparatus according to the present invention. K This graph shows the relationship of.

Fig. 14 shows a prior art for detrack amount detection.

Detrack detection method according to the present invention to achieve the first object is the degree of the laser beam is off the track center in the disc using the Complementary Allocation of Pit Address method recorded off the left and right at regular intervals from the center of the track (detrack) A method for detecting a signal, the sum signal being reproduced from a pit row shifted to one side V ₁ Sum signal reproduced from pit rows shifted in the opposite direction to V ₂ Intercourse V ₁ -V ₂ It is characterized in that for detecting.

A tracking control method for achieving the second object of the present invention is a tracking control method for a device for reproducing a disc using a Complementary Allocation of Pit Address method recorded at a predetermined interval from the center of a track so as to be separated from one side. Sum signal to be reproduced V ₁ Sum signal reproduced from pit rows shifted in the opposite direction to V ₂ Intercourse V ₁ -V ₂ Detecting; And V ₁ -V ₂ And adjusting the tracking of the laser beam such that is zero.

In the detrack detection apparatus according to the present invention which achieves the above-mentioned third object, a first header in which a recording area is divided into sectors, each sector has a header indicating an address, and the header is staggered from side to side at the center point of the track; An apparatus for recording and reproducing a disc having a second header, wherein the first header and the second header have an address area in which an address of a sector is recorded and a sync signal area in which a sync signal for detecting a signal recorded in the address area is recorded. And a quadrature photodetector and a plurality of calculators, wherein the sum signal of the radial pair among the light receiving elements of the quadrature photodetector I ₁ , I ₂ , I ₁ and I ₂ Push-pull signal RF_pp, which is the difference signal of, and I ₁ and I ₂ A reproduction signal generator for generating a sum signal RF_sum which is a sum signal of? A header region detector for generating a header section signal indicating a header region from the sum signal RF_sum generated by the reproduction signal generator; The sum signal RF_sum generated by the reproduction signal generator is introduced, and the magnitude of the RF_sum in the synchronization signal region in the first header is synchronized with the header interval signal generated by the header region detector. V ₁ A first synchronous signal level detector for detecting a; The RF_sum generated by the reproduction signal generator is introduced, and the size of the RF_sum in the synchronization signal region in the second header is synchronized with the header interval signal generated by the header region detector. V ₂ A second synchronous signal level detector for detecting a; Detected by the first synchronous signal level detector V ₁ Detected by the second and second synchronous signal level detectors V ₂ Balance value with K ₁ A balance calculator for calculating a value; And a balance value calculated by the balance calculator K ₁ And baseline K _o Compare and compare the two values K _t Characterized in that it comprises a comparison unit for outputting.

In the tracking control apparatus according to the present invention which achieves the above fourth object, the first header and the first recording section in which the recording area is divided into sectors, each sector has a header indicating an address, and the header is staggered from left to right at the center point of the track. An apparatus for recording and reproducing a disc having two headers, wherein the first header and the second header have an address area in which an address of a sector is recorded and a sync signal area in which a sync signal for detecting a signal recorded in the address area is recorded. The sum signal detected in the synchronization signal region of the first header is determined. V ₁ The sum signal detected in the synchronization signal region of the second header V ₂ When we say V ₁ and V ₂ Difference V ₁ -V ₂ Detrack detection means for detecting the amount of detrack by means of; And V ₁ -V ₂ It characterized in that it comprises a tracking adjustment unit for adjusting the tracking of the laser beam to be zero (zero).

A disc according to the present invention which achieves the above fifth object has a first header and a second header in which a recording area is divided into sectors, each sector has a header indicating an address, and the headers are alternately recorded left and right at the center point of the track. And a first header and a second header each having an address area in which an address of a sector is recorded and a sync signal area in which a sync signal for detecting a signal recorded in the address area is recorded. The sum signal detected in the sync signal area V ₁ The sum signal detected in the synchronization signal region of the second header V ₂ When we say V ₁ and V ₂ Difference V ₁ -V ₂ Has a predetermined limit. Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

The detrack detection method of the present invention is characterized by detecting the amount of detrack by the size ratio detected from the synchronization signal regularly recorded on the disk.

In a DVD-RAM disc, information is recorded in a track, and the track is composed of a land track and a groove track, and the land track and the groove track intersect with each revolution of the disc. The reason why the land track and the groove track intersect in a DVD-RAM disc is to provide a tracking guide initially, and also to reduce crosstalk between adjacent tracks in a high density narrow track.

The track is composed of sectors divided into constant lengths. As a means for enabling physical division of such sectors, a header area is formed in advance at the time of disc manufacture. The physical address of the sector is recorded in this header area.

That is, each sector is largely composed of a header area and a data area in which physical address information (hereinafter referred to as PID) is recorded.

1A shows the physical shape of the land track in a DVD-RAM disc, and FIG. 1B shows the waveform of a push-pull signal in the land track.

The header area is repeatedly arranged in a predetermined section (sector) of the track, and recorded in a so-called Complementary Allocation of Pit Address method in which four PIDs (PID1 to PID4) having the same value are recorded in one header area. PID1 and PID2 are disposed away from the center of the track by a certain amount, and PID3 and PID4 are arranged away from the center of the track by a certain amount so that the laser spot 22 can accurately read the PID even if it is out of the center of the track. In the land track and groove track, the arrangement of PID1, 2 and PID3, 4 is reversed. In the land track, a push-pull signal as shown in Fig. 1B can be obtained.

2A shows the physical shape of the groove track in the DVD-RAM disc, and FIG. 2B shows the waveform of the push-pull signal in the groove track.

3 is an enlarged view of the header area illustrated in FIGS. 1A to 2A. In the structure of the header area, PID1,2 and PID3,4 are arranged to be shifted by a certain amount from side to side with respect to the track center, and each PID has an ID representing a physical address of a sector and a vfo signal of the same frequency for synchronization for ID detection. The signal is recorded. The vfo signal has a recording pattern of 4T (where T is the basic length of the recording signal).

As shown in Fig. 3, the header areas include vfo1 33 and ID1 34 (more than PID1), vfo2 35 and ID2 36 (more than PID2), vfo3 37 and ID3 38 (more than PID3). ), And vfo4 39 and ID4 40 (above PID4).

In FIG. 3, when the laser spot passes the header section of the groove track, the push-pull signal RF_pp as shown in FIG. 4A and the sum signal RF_sum as shown in FIG. 4B may be obtained. In FIG. 4A, the vfo1 signal 42 corresponds to the vfo1 signal region 33 of FIG. 2, and the vfo3 signal 43 corresponds to the vfo3 signal region 37.

FIG. 5 shows the configuration of an apparatus for obtaining the push-pull signal RF_pp shown in FIG. 4A and the sum signal RF_sum shown in FIG. 4B. In Fig. 5, reference numeral 50 denotes a four-part photodetector, 52 and 54 are adders, and 56 denotes a calculation unit.

The apparatus shown in Fig. 5 is a sum signal of the radial pairs B and C, A and D of the light receiving elements A to D of the quadrature photodetector. I ₁ , I ₂ ), I ₁ Wow I ₂ Difference between I ₂ -I ₁ Push-pull signal RF_pp, and I ₁ Wow I ₂ Sum of I ₁ + I ₂ Outputs the sum signal RF_sum.

The magnitude of the vfo1 signal in the sum signal RF_sum when the laser spot crosses the track center line V ₁ Magnitude of vfo3 signal V ₂ Is matched, but when detrack occurs, one side gets bigger and the other gets smaller.

This is because the intensity of light reflected from the signal planes of PID1, 2 and PID3, 4 arranged to be different from each other is different. When the disc is detracked, the intensity of the light reflected by the upper header (peak header) is greater than that reflected by the lower header (bottom header).

Accordingly V ₁ and V ₂ The ratio is different. The ratio between the magnitude of the vfo2 signal and the magnitude of the vfo4 signal is likewise different.

In order to detect the degree to which the size ratio varies, a signal recorded at a constant level should be used during recording. The vfo signal is suitable for this purpose because it has a constant level and a constant frequency. Also, it is easier to detect the size of vfo1,3 than vfo2,4.

In addition, it is preferable to normalize in order to reduce the influence of the reflectance of the disk or the like.

Where the balance value K is

K = (V ₁ -V ₂ ) / (V ₁ + V ₂ )

here, (V ₁ + V ₂ ) Is the term for normalization.

or

K = (V ₁ -V ₂ ) / (P ₁ + P ₂ )

here, (P ₁ + P ₂ ) Is the term for normalization, P ₁ Is the magnitude of the push-pull signal reproduced in the synchronization signal region of the first header, P ₂ Is the magnitude of the push-pull signal reproduced in the synchronization signal region of the second header.

or

K = (V ₁ -V ₂ ) / I ₀ .

here, Io Is a term for normalization and is the magnitude of the sum signal RF_sum in the mirror region.

In Equations 1 to 3 V ₁ and V ₂ Although the balance value was calculated using, it is also possible to use the magnitude of the synchronization signal detected in the vfo2 and vfo4 regions. However, vfo1 and vfo3 are easier to detect than vfo2 and vfo4. It is also possible to use a value obtained by the combination of the synchronization signals detected in the vfo1 and vfo2 regions and a value obtained by the combination of the synchronization signals detected in the vfo3 and vfo4 regions.

If there is no detrack K Value K _o When a detrack occurs K Value K ₁ Is the difference between the two values K _t Is defined as

K _t = K _o -K ₁

In other words, K _t The direction and magnitude of the detrack can be determined by the value and the sign of.

here, K _o May be a value measured in the absence of a detrack, a default value determined by the system controller of the recording / reproducing apparatus, or a value measured in a reference state determined by the system.

In addition, the reference value may be affected by the tilt of the disc during recording and playback. K _o Is preferably corrected by the amount of tilt during recording and reproduction. Here, the tilt amount of the disc is the magnitude of the push-pull signal reproduced from the synchronization signal area of the first header area. P ₁ Magnitude of the push-pull signal reproduced from the synchronization signal region of the first header region P ₂ It is determined by the balance value of.

The quality of the sum signal RF_sum varies depending on the quality of the disk and the conditions of the system. If the value is not limited to some extent, PID may not be recognized or stable servo management may be difficult. So for a disc K ₀ The value of is preferably managed to maintain a constant level.

In the land track and groove track, the positions of PID1,2 and PID3,4 are reversed. K _t To compute K ₁ The polarity of must change from track to track.

6 is a block diagram showing the configuration of a preferred embodiment of the detrack detection device and tracking control device according to the present invention. The apparatus shown in FIG. 6 includes a reproduction signal generator 62, a header area detector 64, a first synchronous signal level detector 66, a second synchronous signal level detector 68, a balance calculator 70, and a comparator ( 72, tracking adjustment 74, land / groove detector 76, and polarity inverter 78.

In the apparatus shown in FIG. 6, the reproduction signal generator 62, the header area detector 64, the first synchronous signal level detector 66, the second synchronous signal level detector 68, the balance calculator 70, and The comparator 72 corresponds to the detrack detection means in the summary of the invention.

The reproduction signal generator 60 is a sum signal of the radial pairs B and C, A and D of the light receiving elements A to D of the quadrature photodetector. I ₁ , I ₂ ), I ₁ Wow I ₂ Difference between I ₂ -I ₁ Push-pull signal RF_pp, and I ₁ Wow I ₂ Sum of I ₁ + I ₂ Outputs the sum signal RF_sum.

The header area detector 64 generates a header section signal (header section signal 1, header section signal 2) representing the header region from the sum signal RF_sum. Here, the header section signal 1 is a signal representing the PID1, 2 regions, and the header section signal 2 is a signal representing the PID3, 4 regions. Since the header region has a larger envelope than the data region, a header section signal representing the header region can be obtained using an envelope detector and a comparator for detecting the envelope of the reproduction signal.

The first synchronous signal level detector 66 is the magnitude of the vfo1 signal shown in FIG. 4 in synchronization with the header section signal 1 generated by the header region detector 64. V ₁ Is detected. In detail, the first enable signal enable 1 having a predetermined interval and a predetermined width is generated from the start point of the header section signal 1, and the gate is gated after the RF_sum is gated by the first enable signal enable 1. By detecting the peak-peak value of the reproduction signal V ₁ Is detected.

The second synchronous signal level detector 68 is the magnitude of the vfo3 signal shown in FIG. 4 in synchronization with the header period signal 2 generated by the header area detector 64. V ₂ Is detected. In detail, a second enable signal enable 2 having a predetermined interval and a predetermined width is generated from the start point of the header section signal 2, the RF_sum is gated by the second enable signal enable 2, and then the gated reproduction signal is gated. By detecting peak-peak values V ₂ Detect.

The balance calculator 70 is detected by the first synchronous signal level detector 66 as shown in equations (1) and (2). V ₁ Detected by the second synchronous signal level detector 68 V ₂ Calculate the ratio of and. Here, the balance calculator 70 may output an average value of balance values obtained from several sectors consecutive in the track direction.

The comparison unit 72 calculates the balance value calculated by the balance calculation unit 70 as shown in equation (4). K ₁ And the predetermined reference value K _o Compare and compare the two values K _t Outputs here, K _o May be a value measured in the absence of a detrack, a default value determined by the system controller of the recording / playback apparatus, or a value measured in a reference state determined by the system.

The land / groove detector 76 receives a reproduction signal and detects whether the current track is a land track or a groove track. As shown in Fig. 1B, the push-pull signal RF_pp in the land track is larger than the size of PID3,4, and in the groove track, the size of PID1,2 is smaller than the size of PID3,4. The land / groove detector 80 determines the land / groove track using this.

The polarity inversion unit 78 outputs a difference value output from the comparison unit 72 according to the result detected by the land / groove detection unit 76. K _t Invert the polarity of.

The tracking adjustment unit 74 is a polarity inverted difference value output from the polarity inversion unit 78. K _t Adjust the tracking accordingly. Difference K _t Since the sign and the magnitude of the represent the direction and the magnitude of the detrack, the tracking of the laser beam is adjusted by feeding it back. The tracking control unit 74 is implemented with a known tracking control device, for example a tracking actuator.

FIG. 7 is a waveform diagram showing the operation of the apparatus shown in FIG. 6. 7 (a) shows the sum signal RF_sum, and FIGS. 7 (b) and 7 (c) show the waveforms of the header section signal 1 and the header section signal 2 generated in the header section signal generator, respectively, and FIG. 7. (d) and 7 (e) show waveforms of the first enable signal enable 1 and the second enable signal enable 2 used in the first synchronous signal level detector 66 and the second synchronous signal level detector 68, respectively. Will look.

8 is a block diagram showing the configuration of another embodiment of a detrack detection apparatus according to the present invention. The apparatus shown in FIG. 8 is similar to the apparatus shown in FIG. 6 except for including a mirror section signal generator 76 and a mirror signal level detector 78. Therefore, the same apparatus is given the same reference numeral and the detailed description is omitted.

The mirror section signal generator 86 generates a mirror section signal representing the mirror area from the sum signal RF_sum provided from the reproduction signal generator 62. In the case of the push-pull signal RF_pp, since the mirror signal becomes zero, the mirror section signal cannot be obtained by the push-pull signal RF_pp.

Since the mirror signal has a very low envelope compared to the data region and the header region, the mirror signal may be generated by the envelope detector and the comparator.

The mirror signal level detector 88 detects the level of the mirror signal from the sum signal RF_sum based on the mirror interval signal generated by the mirror interval signal generator 86. The mirror signal level detector 88 generates a third enable signal enable 3 having a predetermined section and a predetermined width by the mirror section signal generated by the mirror section signal generator, and by the third enable signal enable 3. The sum signal RF_sum is gated and the peak-peak value of the gated sum signal RF_sum is detected.

The balance calculator 80 is configured to level the vfo1 signal detected by the first synchronous signal level detector 66. V ₁ , The level of the vfo3 signal detected by the second synchronous signal level detector 68 V ₂ Mirror signal level detected by mirror signal level detection unit 88 I ₀ The balance value as shown in equation (3) by K ₁ To calculate. Here, the balance calculator 70 may output an average value of balance values obtained from several sectors consecutive in the tangential direction.

9 (a) to 9 (b) are waveform diagrams showing the operation of the apparatus shown in FIG. 9 (a) shows the waveform of the mirror section signal output from the mirror section signal generator, and FIG. 9 (b) shows the waveform of the third enable signal enable 3.

FIG. 10 shows peak-peak values for detecting peak-peak values used in the first synchronous signal level detector 66 of FIG. 6, the second synchronous signal level detector 68, and the mirror signal level detector 88 of FIG. It is shown to show an example of a detector.

The peak-peak detector inputs the sum signal RF_sum and outputs the peak-peak value only while being enabled by the enable signal.

A low pass filter may be used in place of the peak-peak detector. 11 shows a DC component of the RF_sum extracted using a low pass filter and then sampling the DC component by the enable signal. V ₁ , V ₂ , I ₀ Can be obtained.

FIG. 12 shows the result of sampling the signal provided from the low pass filter of FIG. 11, and (a) shows the case where there is no detrack. V ₁ and V ₂ It can be seen that shows the same value.

(B) and (c) of FIG. 12 show a case where there is a detrack. V ₁ and V ₂ By calculating the difference, the direction and size of the detrack can be known.

13 is a detract and balance value in the method and apparatus according to the present invention. K This graph shows the relationship of. In Fig. 11, the vertical axis represents the detrack amount, and the horizontal axis represents the balance value. K Indicates. In FIG. 11, the graph indicated by ▲ shows the case where the sum signal RF_sum and the balance value according to Equation 2 are used. The graph indicated by ▼ shows the case where the sum signal RF_sum and the balance value according to Equation 1 are used.

In the apparatus shown in Figs. 6 to 8, the first synchronous signal level detector 66 and the second synchronous signal level detector 68 V ₁ And V ₂ Although the sum signal RF_sum is used to detect the sum signal, the sum signal of the radial pairs B and C, A and D of the light receiving elements A to D of the quadrature photodetector is used. I ₁ , I ₂ It is also possible to use).

In this case, the first synchronous signal level detector 66 generates a first enable signal enable 1 having a predetermined interval and a predetermined width from the start point of the header section signal 1, and by the first enable signal enable 1. I ₁ By gating and then detecting the peak-peak value of the gated playback signal V ₁ Is detected.

The second synchronous signal level detector 68 generates a second enable signal enable 2 having a predetermined interval and a predetermined width from the start point of the header section signal 2, and by the second enable signal enable 2. I ₂ By gating, then by detecting the peak-peak value of the gated playback signal V ₂ Detect.

As described above, the detrack detection method and apparatus according to the present invention has an effect of accurately detecting the detrack state of the laser beam without requiring a specific pattern for detrack detection.

The tracking control method and apparatus according to the present invention has the effect of making the recording / reproducing apparatus maintain a stable tracking state and an optimal recording / reproducing state by accurately detecting the detrack state of the laser beam.

Claims (30)

In the method for detecting the degree of laser beam deviation (de-track) in the disc using the Complementary Allocation of Pit Address method recorded off the left and right at regular intervals from the center of the track, Sum signal reproduced from pit rows shifted to one side V ₁ Sum signal reproduced from pit rows shifted in the opposite direction to V ₂ Intercourse V ₁ -V ₂ De-track detection method characterized in that for detecting. The method of claim 1, V ₁ -V ₂ Is V ₁ + V ₂ De-track detection method characterized in that the normalized to. The method of claim 1, V ₁ -V ₂ Is Push-pull signal reproduced from pit rows shifted to one side P ₁ Push-pull signal reproduced from pit rows shifted in the opposite direction to P ₂ Sum of P ₁ + P ₂ De-track detection method characterized in that the normalized to. The method of claim 1, V ₁ -V ₂ Is Mirror signal detected from mirror area where no pit is recorded I ₀ De-track detection method characterized in that the normalized to. The detrack detection method according to claim 1, wherein the pit string is a pit string recorded in a synchronization signal region included in a header region of a disc. The method of claim 5, further comprising: detecting from a plurality of sectors adjacent in the track direction. V ₁ -V ₂ De-track detection method characterized in that the average value of using. The detrack detection method according to claim 1, wherein the disc is a DVD-RAM. The recording area is divided into sectors, each sector having a header indicating an address, the header having a first header and a second header which are recorded staggered from side to side at the center point of the track, and the first header and the second header have the address of the sector. A detrack detection method of an apparatus for reproducing an optical disc having an address area in which is recorded and a sync signal area in which a sync signal for detecting an address signal recorded in the address area is recorded. The sum signal detected in the synchronization signal region in the first header is V ₁ The sum signal detected in the synchronization signal region of the second header V ₂ When we say V ₁ and V ₂ Difference V ₁ -V ₂ A detrack detection method characterized by detecting a detrack amount. In the tracking control method of a device for playing a disc using the Complementary Allocation of Pit Address method recorded from the center of the track to the left and right at regular intervals, Sum signal reproduced from pit rows shifted to one side V ₁ Sum signal reproduced from pit rows shifted in the opposite direction to V ₂ Intercourse V ₁ -V ₂ Detecting; And V ₁ -V ₂ And adjusting the tracking of the laser beam such that is zero. The method of claim 9, wherein V ₁ -V ₂ The process of detecting V ₁ -V ₂ To V ₁ + V ₂ Tracking control method characterized in that the normalization. The method of claim 9, wherein V ₁ -V ₂ The process of detecting V ₁ -V ₂ Push-pull signal reproduced from pit rows shifted to one side P ₁ Push-pull signal reproduced from pit rows shifted in the opposite direction to P ₂ Sum of P ₁ + P ₂ Tracking control method characterized in that the normalization. The method of claim 9, wherein V ₁ -V ₂ The process of detecting V ₁ -V ₂ The mirror signal detected from the mirror area where pits are not recorded I ₀ Tracking control method characterized in that the normalization. The method of claim 9, wherein V ₁ -V ₂ The process of detecting And a sum signal reproduced from a pit stream recorded in a synchronization signal area included in the header area of the disc. The method of claim 13, wherein V ₁ -V ₂ The process of detecting Detected from a plurality of sectors adjacent in the track direction V ₁ -V ₂ Tracking control method characterized in that using the average value of. 10. The method of claim 9, wherein the disc is a DVD-RAM. The method of claim 15, V ₁ -V ₂ And inverting the polarity of each land / groove track. The recording area is divided into sectors, each sector having a header indicating an address, the header having a first header and a second header which are recorded staggered from side to side at the center point of the track, and the first header and the second header have the address of the sector. An apparatus for recording and reproducing a disc having an address area in which is recorded and a sync signal area in which a sync signal for detecting a signal recorded in the address area is recorded, A quadrature photodetector and a plurality of calculators, the sum signal of the radial pair of the light receiving elements of the quadrant photodetector I ₁ , I ₂ , I ₁ and I ₂ Push-pull signal RF_pp, which is the difference signal of, and I ₁ and I ₂ A reproduction signal generator for generating a sum signal RF_sum which is a sum signal of? A header region detector for generating a header section signal indicating a header region from the sum signal RF_sum generated by the reproduction signal generator; The sum signal RF_sum generated by the reproduction signal generator is introduced, and the magnitude of the RF_sum in the synchronization signal region in the first header is synchronized with the header interval signal generated by the header region detector. V ₁ A first synchronous signal level detector for detecting a; The RF_sum generated by the reproduction signal generator is introduced, and the size of the RF_sum in the synchronization signal region in the second header is synchronized with the header interval signal generated by the header region detector. V ₂ A second synchronous signal level detector for detecting a; Detected by the first synchronous signal level detector V ₁ Detected by the second and second synchronous signal level detectors V ₂ Balance value with K ₁ A balance calculator for calculating a value; And Balance value calculated by the balance calculator K ₁ And baseline K _o Compare and compare the two values K _t De-track detection device comprising a comparison unit for outputting the. 18. The method of claim 17, wherein the reference value K _o Is a balance value measured when there is no detrack. 18. The method of claim 17, wherein the reference value K _o Is a balance value measured in a prescribed reference state. The method of claim 16, wherein the reference value K _o The de-track detection device according to claim 1, wherein the track is corrected by the amount of tilt during recording and reproduction. 21. The method of claim 20, wherein the tilt amount is the magnitude of the push-pull signal reproduced from the synchronization signal region of the first header region. P ₁ Magnitude of the push-pull signal reproduced from the synchronization signal region of the first header region P ₂ De-track detection apparatus characterized in that it is determined by the balance value of. 17. The balance value of claim 16, wherein the balance value is output from the balance calculator. K ₁ silver (V ₁ -V ₂ ) / (V ₁ + V ₂ ) De-track detection apparatus, characterized in that determined by. The method of claim 16, A mirror section signal generator for generating a mirror section signal representing a mirror region from the sum signal RF_sum of the playback signals provided by the playback signal generator; And The sum signal RF_sum of the reproduction signals provided by the reproduction signal generator is introduced, and the level of the mirror signal is synchronized with the mirror interval signal generated by the mirror interval signal generator. I ₀ Further comprising a mirror signal level detection unit for detecting, The balance calculator is configured to detect the level of the first synchronization signal detected by the first synchronization signal level detector. V ₁ Level of the second synchronous signal detected by the second synchronous signal level detector V ₂ , And mirror signal level I ₀ The detrack detection apparatus characterized by calculating a balance by means of. 24. The balance value of claim 23, wherein the balance value is output from the balance calculator. K ₁ silver (V ₁ -V ₂ ) ／ I ₀ De-track detection apparatus, characterized in that determined by. The method of claim 17, The first synchronous signal level detector is a sum signal of a radial pair generated by the reproduction signal generator. I ₁ In the synchronization signal region in the first header in synchronization with the header interval signal generated in the header region detector. I ₁ Size V ₁ Detect The second synchronous signal level detector is a sum signal of a radial pair generated by the reproduction signal generator. I ₂ Is inputted and is synchronized with the header section signal generated by the header region detector. I ₂ Size V ₂ De-track detection device, characterized in that for detecting. The recording area is divided into sectors, each sector having a header indicating an address, the header having a first header and a second header which are recorded staggered from side to side at the center point of the track, and the first header and the second header have the address of the sector. An apparatus for recording and reproducing a disc having an address area in which is recorded and a sync signal area in which a sync signal for detecting a signal recorded in the address area is recorded, The sum signal detected in the synchronization signal region in the first header is V ₁ The sum signal detected in the synchronization signal region of the second header V ₂ When we say V ₁ and V ₂ Difference V ₁ -V ₂ Detrack detection means for detecting the amount of detrack by means of; And V ₁ -V ₂ And a tracking adjustment unit for adjusting the tracking of the laser beam such that is zero. 27. The apparatus of claim 26, wherein the detrack detection means A quadrature photodetector and a plurality of calculators, the sum signal of the radial pair of the light receiving elements of the quadrant photodetector I ₁ , I ₂ , I ₁ and I ₂ Push-pull signal RF_pp, which is the difference signal of, and I ₁ and I ₂ A reproduction signal generator for generating a sum signal RF_sum which is a sum signal of? A header region detector for generating a header section signal indicating a header region from the sum signal RF_sum generated by the reproduction signal generator; The sum signal RF_sum generated by the reproduction signal generator is introduced, and the magnitude of the RF_sum in the synchronization signal region in the first header is synchronized with the header interval signal generated by the header region detector. V ₁ A first synchronous signal level detector for detecting a; The sum signal RF_sum generated by the reproduction signal generator is introduced, and the magnitude of the RF_sum in the synchronization signal region in the second header is synchronized with the header interval signal generated by the header region detector. V ₂ A second synchronous signal level detector for detecting a; Detected by the first synchronous signal level detector V ₁ Detected by the second and second synchronous signal level detectors V ₂ Balance value with K ₁ A balance calculator for calculating a value; And Balance value calculated by the balance calculator K ₁ And baseline K _o Compare and compare the two values K _t Tracking control device comprising a comparison unit for outputting. 27. The disk of claim 26, wherein the disk is a DVD-RAM, Difference value output from the comparator according to land / groove track K _t And a polarity inverter for inverting the polarity of the tracking control device. 29. The tracking control apparatus according to claim 28, further comprising a land / groove detector for introducing a sum signal RF_sum provided from the reproduction signal generator, detecting a land / groove track, and providing the land / groove track to the polarity inverter. The recording area is divided into sectors, each sector having a header indicating an address, the header having a first header and a second header which are recorded staggered from side to side at the center point of the track, and the first header and the second header have the address of the sector. A disc having an address area in which is recorded and a sync signal area in which a sync signal for detecting a signal recorded in the address area is recorded, The sum signal detected in the synchronization signal region in the first header is V ₁ The sum signal detected in the synchronization signal region of the second header V ₂ When we say V ₁ and V ₂ Difference V ₁ -V ₂ Has a predetermined limit.