KR100677090B1 - Method of PID addressing using wobble, encoding circuit of wobble address, method and circuit for detecting the wobble address and recording medium - Google Patents

Abstract

위상차를 주어서 더해진 워블 신호가 QPSK(Quadrature Phase Shift Keying) 신호가 되도록 기록하여 보다 많은 데이터를 기록할 수 있고, 워블 신호가 없어지는 구간이 발생하지 않기 때문에 워블 클럭 신호를 복원하는 데 유리하다.The present invention discloses a PID addressing method using a wobble signal, a detection method thereof, a wobble address encoding circuit, a detection circuit thereof, and a recording medium. In an embodiment of the present invention, one of the wall surfaces on both sides of the groove track is phase-modulated with groove address information indicating physical identification information using a wobble clock signal, and the other wall has a predetermined angle phase with the wobble clock signal. By phase-modulating and recording land address information using the shifted wobble clock signal, the phase of the wobble between adjacent tracks is set to 90 degrees.

The wobble signal added by giving a phase difference can be recorded to be a quadrature phase shift keying (QPSK) signal to record more data, and it is advantageous for restoring the wobble clock signal because a section in which the wobble signal disappears does not occur.

Description

PID of addressing using wobble, encoding circuit of wobble address, method and circuit for detecting the wobble address and recording medium}

1 is a diagram illustrating a PID addressing structure using a conventional uneven prepit.

2 shows an example in which wobble is recorded in both a groove and a land track.

3 illustrates an example in which a wobble address is recorded only on one wall of an existing groove.

4 is a diagram illustrating a PID addressing structure in which a wobble address is recorded according to the present invention.

FIG. 5 is a waveform diagram of a wobble signal in a land / groove track in the structure shown in FIG. 4.

FIG. 6 illustrates a track structure in which a mirror or wobble sync signal for initial wobble phase sync according to the present invention is recorded.

7A to 7C illustrate an example of the PID addressing structure illustrated in FIG. 4.

FIG. 8 is a diagram showing a sector mark at the head of a sector and the first sector mark of the track as an example of the track structure shown in FIG.

9A to 9E are diagrams showing an example of the contents of a sector mark shown in FIG.

10 is a circuit diagram according to an embodiment of a wobble address encoding circuit according to the present invention.

11 is a circuit diagram of an embodiment of a wobble address detection circuit according to the present invention.

12A and 12B are waveform diagrams of respective parts of the detection circuit shown in FIG.

TECHNICAL FIELD The present invention relates to the field of optical recording / reproducing, and more particularly, to a PID addressing method using a wobble, a wobble address encoding circuit, a detection method and a circuit, and a recording medium for a high density optical recording / reproducing system.

In an optical recording / reproducing system, information recorded for physical location recognition for determining a location on a disc to be recorded is called PID (Physical Identification Data). In general, PID is a recording / reproducing medium that is recorded in sector units. This corresponds to the address information of the physical sector. This is essential information for recording data at any location on the disc and finding that location.

In other words, PID refers to address information that enables a particular sector to be found in order to record / reproduce data at an arbitrary position in a disk capable of recording / reproducing, and at the time of making a disk regardless of the presence or absence of user data. Refers to address information of a sector pre-mastered. Therefore, in order to find the position of the sector to be recorded / reproduced accurately and quickly, it must be resistant to errors and have a structure that can be detected structurally as soon as possible.

There are many ways to write PID on disk, but there are two ways. The first is a method of recording physical location information that creates embossed pits of the same shape as read-only optical discs on the disc and uses them to determine specific locations on the disc. There is a method of using a wobble signal that can be obtained by giving a change of a recording track at regular intervals.

The area provided for the purpose of PID addressing by means of the former method, that is, the uneven prepit is called a header field as shown in Fig. 1, and a 2.6 GB (Giga Bytes) DVD- According to the Digital Versatile Disc Random Access Memory (RAM) specification (DVD specification for Rewritable Disc (DVD-RAM) Version 1.0) or 4.7 GB of DVD-RAM, the pre-pit configuration is required when manufacturing the board. Physical location information is input to a position called a header section. The header part includes a variable frequency oscillator (VFO) area for a phase locked loop (PLL), a physical identification data area (PID) assigned a sector number, an ID error detection (IDE) area for storing ID error detection information, and a hair part. It consists of a PA (postamble) area and the like for adjusting the initial state for the modulation of the data that is subsequently recorded. The method of properly arranging the header portion composed of such uneven prepits at the head of the sector so that the pickup can easily go to a desired position using this information is called a PID addressing method using prepits. The sector number, sector type, land track / groove track distinction, and the like can be recognized, and servo control can be performed.

In the conventional PID addressing method using the uneven prepits, since the data cannot be recorded in the pit-formed area, there is a problem that the recording density decreases by the pit area formed.

Therefore, the recordable area (user data area) must be increased by minimizing the track pitch (overhead) as well as reducing the track pitch in order to store high density, large capacity data. For this purpose, it is effective to use a wobble signal.

In the case of the recording disk, groove-shaped grooves are formed along the recording track on the substrate so that the track to be recorded can be accurately picked up even when the substrate is not formed when the substrate is formed. The formed part is called a groove, and the other part is called a land, and it is divided into a method of recording only one land or groove according to the recording method, and a method of recording data on both land and groove. It is advantageous to use a land / groove recording method for recording data.

In addition, a method of generating a signal of a specific frequency by changing both walls of the groove as an auxiliary clock means during recording. Such a signal is called a wobble signal. A wobble signal having a single frequency is also recorded on the board of the DVD-RAM disk.

In the PID addressing method using a wobble signal, additional information such as a PID signal can be recorded by adding a special change such as changing a phase or a frequency at a predetermined period when writing a wobble signal having a simple single frequency. In this case, the PID signal recorded superimposed on the wobble signal is generally called a wobble address.

Since the PID addressing method using the wobble signal uses a change in both walls of the groove track to record the wobble, as shown in FIG. 2, the PID addressing method can be used only in a land recording disc that does not record information in the groove track. . That is, in the case of using the change of both walls of the groove track, the land track between the two groove tracks is mixed with the address information of the two groove tracks corresponding to the boundary of both sides forming the land track, so that appropriate information cannot be obtained. As a result, the wobble address formed on the groove track cannot represent both the land track and the groove track address. Therefore, the land track and the groove track are difficult to use in a land / groove recording disc that records information. there was.

In other words, although the position where the wobble address is recorded is the groove side wall surface of the boundary position of the land track and the groove track, in the land / groove recording method in which information is recorded in both the land track and the groove track, both wall surfaces of the land track and the groove track are recorded. Since the information on the wobble formed at the same time is read at the same time, the wobble addressing method shown in FIG. 2 has a problem in that the PID signal cannot be properly recorded and detected.

As a method for solving this problem, as shown in FIG. 3, a method of recording a wobble address only on one wall of the groove track has been proposed. However, this wobble addressing method not only reduces the signal size because the wobble signal is generated on one side wall of the groove track, but also reads the same signal from adjacent land tracks and groove tracks. There was a problem such as needing more information to correctly identify the track.

Accordingly, an object of the present invention is to provide a novel PID addressing method using a wobble to solve the overhead problem of the uneven prepit addressing method and to solve a problem that is difficult to apply to the land / groove recording method of the wobble addressing method. There is.

Another object of the present invention is that the wobble signals of both walls of the groove track (or land track) are configured differently so that one wall has an in-phase component of quadrature phase shift keying (QPSK). The present invention provides a PID addressing method in which a signal is recorded and a quadrature phase signal (hereinafter referred to as a quadrature component) is recorded on the other wall.                         

It is still another object of the present invention to record a wobble signal of two walls of a groove track (or a land track) differently, so that in-phase component signals of QPSK are recorded on one wall, and orthogonal component signals are recorded on the other wall. There is provided a method for detecting address information from a medium.

It is another object of the present invention to provide a wobble address encoding circuit for a high density optical disc recording / reproducing system.

Another object of the present invention is to provide a wobble address detection circuit for a high density optical disc recording / reproducing system.

It is still another object of the present invention to record a wobble signal of two walls of a groove track (or a land track) differently, so that in-phase component signals of QPSK are recorded on one wall, and orthogonal component signals are recorded on the other wall. To provide the medium.

In order to achieve the above objects, the PID addressing method according to the present invention is a method for addressing physical identification information using a wobble on an optical recording / reproducing medium: either one of the wall surfaces on either side of one track of a groove or a land track. Phase-modulate first address information representing physical identification information using a first wobble signal on one side of the wall, and use a second wobble signal having a predetermined phase relationship with the first wobble signal on the other wall. And phase-modulating the address information.

The wobble address detection method according to the present invention is an optical recording / reproducing system having an optical detection element, wherein physical identification information is formed by using a first wobble signal on either wall of both walls of one track of a groove or a land track. From the optical recording / reproducing medium in which the first address information indicating? Is phase modulated, and on the other wall surface, the second address information is phase modulated using a second wobble signal having a predetermined phase relationship with the first wobble signal. A method of detecting a wobble address, comprising: multiplying a difference signal of a detection signal of the photodetecting device divided into two in a radial direction by multiplying first and second wobble signals having a predetermined phase relationship with each other to obtain an original signal and a harmonic component; Providing a first and a second output signal having a phase component after removing harmonic components from the first and second output signals. And recovering the first address information and the second address information from the original signal component.

A wobble address encoding circuit according to the present invention is a circuit for encoding an address using a wobble for an optical recording / reproducing system, comprising: generating a first wobble signal and having a predetermined phase relationship with the generated first wobble signal; 2 a phase-modulated first address information indicating physical identification information using a first wobble signal on one of the walls providing the wobble signal and the wall on either side of either track of the groove or the land track, and the other The wall surface includes a phase modulator for phase modulating the second address information using the second wobble signal.

The wobble address detection circuit according to the present invention is an optical recording / reproducing system provided with a light detecting element, wherein physical identification information is obtained by using a first wobble signal on either wall of either side of a track of a groove or a land track. Optical recording / reproducing medium in which first address information indicating a phase is modulated and second address information is phase modulated on the other wall using a second wobble signal having a predetermined phase relationship with the first wobble signal. A circuit for detecting a wobble address from a circuit comprising: detecting a first wobble clock signal using a difference signal (push-pull signal) of a detection signal of a photodetecting device divided into two in the radial direction, and detecting the first wobble clock signal; Is a push-pull signal using a wobble clock recoverer for providing a second wobble clock signal having a predetermined phase relationship and the first and second wobble clock signals. Emitter and is characterized in that the first and second address information in a phase demodulator to restore a groove and land address information.

In addition, the recording medium according to the present invention has a groove / land recording method, and in a recording medium capable of recording / reproducing: using a first wobble signal on one of the wall surfaces on either side of either track of a groove or a land track. And the first address information indicating the physical identification information is phase modulated, and the second address information is phase modulated on the other wall surface with the second wobble signal having a predetermined phase relationship with the first wobble signal. have.

DETAILED DESCRIPTION Hereinafter, a PID addressing method using a wobble signal, a detection method thereof, a wobble address encoding circuit, a detection circuit thereof, and a recording medium according to the present invention will be described with reference to the accompanying drawings.

When a wobble address constructed using both wall surfaces of the groove track is read from the land track, signals from two adjacent wall surfaces of the groove are synthesized because signals are read from each of the groove tracks on both sides. In order to process the synthesized signal without interference of the wobble signal between adjacent tracks, the present invention proposes a PID structure using a wobble as shown in FIG.

FIG. 4 is a diagram illustrating a PID addressing structure using a wobble capable of independently recording an address in each land and groove track according to the present invention. The present invention needs to separately access a physical position on a land / groove. This disc is a structure that is applied when the angular velocity between adjacent tracks is constant, such as ZCLV (Zoned Constant Linear Velocity) or CAV (Constant Angular Velocity). Since both walls of the grooves have different shapes, it is preferable to use a two-beam for mastering.

In the case of manufacturing a substrate, a groove is formed using a laser beam in a groove forming area. At this time, the laser beam is displaced by the magnitude of the wobble signal in a direction perpendicular to the tracking direction to form a wobble signal. . Therefore, in the case of using the 1-beam, since the shape of both wall surfaces of the groove cannot form different wobble as illustrated in the present invention, a method of recording the change of the wall surfaces of both sides using the 2-beam is different. desirable. Another method is to displace a beam whose diameter of one beam is smaller than the track width by the desired track width at right angles to the track direction. However, in this method, in the case of high density recording, the track width becomes narrow, which makes it difficult to sufficiently reduce the diameter of the beam.

Wobble signals on both walls of the groove are configured differently so that in-phase component signals of quadrature phase shift keying (QPSK) are recorded on one wall, and quadrature component signals are recorded on the other wall. The groove address is always recorded in the in-phase component signal, and the land address is always recorded in the orthogonal component signal. The structure shown in FIG. 4 has the difficulty of doing two-beam mastering but has the advantage of simplifying the circuit for detecting the signal. Of course, there may be a structure in which the land address is always recorded in the in-phase component signal, and the groove address is always recorded in the orthogonal component signal.

위상을 가진 워블 신호를, "1"일 때는 180

의 반대 위상을 가진 워블 신호를 기록한다. 워블 클럭의 위상을 일 실시예로서 그루브 트랙의 한 쪽 벽면에 대해서는 0

의 위상을 가진 캐리어를 사용하고, 그루브 트랙의 다른 쪽 벽면에 대해서는 90

위상이 틀어진 캐리어를 사용한다. 0 when the address data bit is "0"

Wobble signal with phase, 180 when "1"

Record the wobble signal with the opposite phase of. As an example, the phase of the wobble clock is zero for one wall of the groove track.

Use a carrier with a phase of 90 for the other wall of the groove track.

Use a carrier out of phase.

위상을 가진 워블 신호가 기록되고, "1b"일 때는 180

위상을 가진 워블 신호가 기록된다.An example of the form of the wobble signal in the land / groove track in the structure shown in FIG. 4 is as shown in FIG. 5, and 0 when the address data is "0b".

Wobble signal with phase is recorded, 180 when "1b"

The wobble signal with phase is recorded.

The groove address having the in-phase component and the land address having the orthogonal component recorded on each of the wall surfaces of the groove track are BPSK (Bi-Phase Shift Keying) modulated signals, and the signals read from each track are the sum of the two signals. That is, address information of the groove track is modulated in the in-phase component, and address information of the land track is modulated in the orthogonal component to form a quadrature phase shift keying (QPSK) modulated signal.

In other words. The in-phase component signal W _I of QPSK recorded on one wall of the groove track can be expressed as follows.

이고, f는 워블 신호의 주파수이다. Here, T is a sample period of address data, and a (nT) has a value of address "1" or "-1" in T periods according to each bit value of groove address data. The change period T of the address data is larger than the period 1 / f of the wobble signal.

And f is the frequency of the wobble signal.

The orthogonal component signal W _Q recorded on the other wall surface of the groove track can be expressed as follows.

Here, b (nT) has a value of address "1" or "-1" in T periods according to each bit value of land address data.

If the wobble signal is configured differently on both walls of the groove track, the structure of the wobble signal of each track can be expressed as follows.

On the other hand, it is very important to detect the initial phase of the wobble signal. Therefore, as shown in FIG. 6, it is preferable to record a wobble sync signal that can phase the mirror zone or the wobble in each sector or a specific unit. This will be described in more detail with reference to FIGS. 8 and 9. In addition, in the case of the CAPA (Complementary Allocated Pit Address) method currently used in the DVD-RAM, the CAPA signal itself and the VFO included in the CAPA signal can be used as the reference phase signal of the wobble signal.

When the wobble address is detected from each track to which the PID is addressed using the wobble in this manner, the push-pull signal is phase-modulated so that the carrier, that is, the wobble clock signal, may be multiplied to detect the phase component of the original signal (address data). That is, multiplying the carrier by the phase-modulated signal, the harmonic components multiplied by the original signal of the DC term (Direct Current Term) and multiplied by two.

t)를 승산해서 승산된 결과를 저역 필터링해서 고조파 성분은 버리고 원 신호 성분을 검출해내면 된다. To recover the groove address from the wobble signal recorded as in Equation 3, the carrier sin (

Multiply by t) and multiply the multiplied result by discarding harmonic components and detecting the original signal components.

t)를 승산해서 승산된 결과를 저역 필터링해서 고조파 성분을 버리고 원 신호 성분만을 검출해내면 된다. To recover the land address from the wobble signal recorded as in Equation 3, the carrier cos (

Multiply by t) and multiply the multiplied result by discarding harmonic components and detecting only the original signal components.

의 위상 차이를 가지고 있기 때문에 각 트랙에서 읽어들인 워블 신호는 자연적으로 QPSK 신호가 되기 때문에 적절한 워블 클럭(sin(

t), cos(

t))을 이용하면 그루브 어드레스 정보와 랜드 어드레스 정보를 검출할 수 있다. Like this, the wobble shape of the left and right walls of each track is different, and these two different wobbles

Since the wobble signal read from each track is naturally a QPSK signal because it has a phase difference of, a proper wobble clock (sin (

t), cos (

t)), the groove address information and the land address information can be detected.

In addition, if the period of the address information is synchronized with a simple ratio such as 1: 1 or 1: 2 for the carrier, a synchronization detection method that simply detects the phase of the signal is possible. In other words, the synchronous detection method is a method of extracting a phase of a signal by multiplying a carrier by a phase modulated signal and detecting only the magnitude of the signal at regular intervals without detecting the signal through a low pass filter. Since the detection method for such a PSK signal is generally known, a detailed description of the principle will be omitted.

Next, the PID structure of the wobble signal using the change of the wall on both sides of the groove according to the present invention will be described in more detail.

Preferably, the address information for one sector is repeated at least three times. Since the PID information is relatively smaller than the ECC (Error Correction Code) block size of general user data, there is a problem that the ECC efficiency is lowered, and the possibility of miscorrection is increased. It is more efficient than increasing the number of bits for correction. On the other hand, an error detection code (EDC) is generally used for error correction of address information.

In the present invention, when the PID information is added to the wobble by using a phase modulation method, the wobble signal has the same period, and as the size of the sector increases, the physical length becomes longer to record the wobble signal of more cycles. This has the advantage of increasing the size of the PID information. On the other hand, if the sector size is too large, the minimum recording unit of data becomes large, which causes inefficiency.

The size of the sector is preferably as large as the size of the ECC block as much as possible. Since the ECC processing unit is the minimum recording unit, when setting a sector in a smaller unit, the data is read after all sectors included in the ECC block including the sector are read / modified or read. The process of recording, such as recording / modifying, updating the ECC information accordingly, and then recording the data, undergoes a complicated process called read modify write after reading.

In addition, the existing 4.7GB (Giga Bytes) DVD-RAM is composed of an ECC block of 32 kilobytes (Kbytes) and a sector of 2 Kbytes. The length of the record field of the sector is composed of 41072 channel bits.

However, in the case of high density recording, it is preferable to make the sector unit larger than 4.7 GB DVD-RAM. If the density becomes higher than the ECC processing unit, the amount of defects that can be corrected will be less than that of the existing 4.7 GB DVD-RAM. It is desirable to keep the size of the correctable defect required in the 4.7 GB DVD-RAM, and therefore the size of the sector is also desirable. The size of the sector can be considered to be 4Kbyte, 8Kbyte or 16Kbyte. If the size of the sector is 4 Kbytes, and the existing additional information is assumed to be maintained, the number of channel bits per sector is 82144 bits.

On the other hand, when the period of the recorded channel data is Ts, the period of the wobble signal is Tw, and the period of the PID data is Tpid, the effects of the change of the period of these signals are as follows.

The period Ts of channel data determines the recording density on the disc. As the period Tw of the wobble signal becomes longer, the frequency of the wobble signal decreases so that the wobble signal approaches or invades the band of the servo signal such as a tracking error signal, and as the period becomes shorter, the frequency of the wobble signal becomes shorter. Becomes high, which causes a problem of approaching or invading the RF signal band in which user data is recorded. Therefore, it is important to determine the band of the appropriate wobble signal. In the present invention, the period Tw of the wobble signal has a range (50 Ts < Tw < 450 Ts) larger than 50 Ts and smaller than 450 Ts. In addition, for 4.7GB DVD-RAM, Tw consists of 186Ts.

Tpid<8Tw)가 바람직하다.The period (Tpid) of the PID data determines the bandwidth of the modulated signal when the PID data is modulated using the wobble carrier. If the period of the PID data is the same as the period Tw of the wobble signal (Tpid = Tw), if the frequency of the wobble signal is fw, the bandwidth of the modulated signal is 2fw, and the period of the PID data is 2 of the period of the wobble signal. In the case of a double (Tpid = 2Tw), the bandwidth of the modulated signal becomes fw and the longer the Tpid, the narrower the bandwidth of the modulated signal, resulting in less interference with surrounding signals. However, the longer the Tpid, the lower the efficiency of the modulated signal, so that the amount of PID data that can be recorded decreases. Therefore, the range of 1.5Tw to about 8Tw (1.5Tw in the case of PID of the PID data)

Tpid <8Tw) is preferred.

7A to 7C are diagrams illustrating an example of the content of a wobble PID according to the PID addressing structure illustrated in FIG. 4, wherein one PID unit is used to determine a start position of a wobble PID signal as illustrated in FIG. 7A. Wobble sync with synchronization information, Wobble Carrier composed of pure wobble signals without PID data, PID data phase modulated with Wobble Carrier with address information, Error detection code (EDC) It is. Here, the positions of the wobble sync and the wobble carrier may be interchanged.

At least three address data (PID data) are preferably repeated in one sector as shown in FIG. 7B. This is for the three address data to increase the robustness against miscorrection or misdetection. Therefore, a configuration in which the same type of PID unit including an address is repeated three times in one sector period is preferable.

In addition, at the head of the sector, as shown in Fig. 7C, a sector mark indicating the start of a physical sector is disposed, and each sector mark has a track mark having information about a mirror area and a track currently located for one wobble clock period. (Marked TM), it consists of a VFO signal for synchronizing the recording PLL before the start of the sector. Here, the mirror area is an area that does not have any signal or information on the path through which the recording / reproducing beam on the disk passes, and reflects the incident beam with a constant reflectance, and has a refractive effect due to a pit, a recording mark, or a land / groove structure. Since does not occur, the magnitude of the output signal read from the mirror area is maximized.

The wobble PID structure of the present invention detects the start of address information (PID data) before each address information and prevents the phase of the wobble carrier from being prevented from propagating a problem such as a temporary PLL failure or a shift in clock phase to the next address information. It is desirable to have synchronization information that can be detected. In particular, it is preferable that not only the synchronization information can be detected in a state where data is modulated, but also the synchronization information can be detected even after data demodulation. Accordingly, the synchronization information for the address information of the present invention exists in the form of a wobble sync using a Barker Code, which is a kind of pseudo random sequence, and a method of constructing and detecting the Barker code and the synchronization signal. Is disclosed in U.S. Patent No. 5,511,099 filed under the name of "Passband Sync Block Recovery" by the same applicant, and the detailed description thereof will be omitted.

In addition, in the case of data modulated by the QPSK method, carrier detection may be performed by recording a burst signal having only a certain period of carriers or recording a carrier signal as a pilot tone to detect a wobble carrier. Various methods for facilitating the method are required. In particular, in the case of a wobble PID, it is preferable to insert a burst signal having only a certain period of wobble carrier signal because of technical difficulties in inserting a carrier by a pilot tone method. This is suitable for a system with little change in frequency in the case of the pilot tone method, but maintains the phase characteristics of the band pass filter for extracting the pilot tone uniformly in a system in which frequency fluctuation occurs with a mechanical device. The problem arises because it is difficult to detect the correct phase.

FIG. 8 is a view schematically showing the shape of a sector mark at the head of each sector and the first sector mark of each track in the track structure shown in FIG. 6, which transitions from a groove track to a land track or a land track to a groove track; The first sector mark (called a zero sector mark or a reference sector mark) located at the beginning of the track and at the beginning of the track is shown. Sector marks are located not only on groove tracks but also on land tracks, and the structure of sector marks is arranged differently depending on whether it is an odd track or even track, and the first sector mark of the track is different from other sector marks.

Each of these sector marks serves to determine whether the track to be read or written is an excellent track or an odd track, and to determine the starting position of a land or groove track.

As shown in Fig. 9A, the sector mark of the odd track of the even groove track or the even land track is a mirror area, the track mark and the VFO signal, and the sector mark of the odd groove track or the odd land track is the sector mark of the even track. Unlike FIG. 9B, the mirror area is disposed in place of the track mark, that is, the mirror area, the mirror area, and the VFO signal are arranged in this order. The sector mark of the even track shown in FIG. 9A and the sector mark of the odd track shown in FIG. 9B may be interchanged, and there may be further modifications.

On the other hand, the first sector mark of the even track for recording the information on the sector as a reference indicating the start position of each track is shown in FIG. 9C in front of the structure of the sector mark of the even track (FIG. 9A). As a structure in which track marks are further arranged, that is, they are arranged in the order of a mirror area, a track mark, a mirror area, a track mark, and a VFO.

The first sector mark of the rider track is a structure in which the mirror area and the track mark are further disposed before the structure of the sector mark of the rider track (Fig. 9B), that is, the mirror area, the track mark, the mirror area, and the mirror, as shown in Fig. 9D. Areas are arranged in order of VFO signals. The first sector mark of the even track shown in FIG. 9C and the first sector mark of the odd track shown in FIG. 9D may be interchanged, and there may be further modifications.

Fig. 9E shows a sector mark and a PID structure when each track has m sectors. The sector marks are arranged not only on the groove track but also on the land track, and the PID unit is repeatedly arranged three times in each groove track. have.

Next, the generation and detection of the wobble signal using the change of the wall surface on both sides of the groove proposed by the present invention will be described.

10 is a circuit diagram according to an embodiment of a wobble address encoding circuit according to the present invention, and is largely comprised of a wobble signal generator 100, a phase shifter 102, and PSK modulators 104 and 106.

시프트해서 위상이 시프트된 워블 신호를 생성한다.In FIG. 10, the wobble signal generator 100 generates a wobble signal having a predetermined wobble frequency fw, and the phase shifter 102 sets the phase of the wobble signal generated by the wobble signal generator 100 to 90 degrees.

Shift to generate a wobble signal shifted in phase.

의 위상을 갖는 캐리어 즉, sin(

t)가 승산된 BPSK 변조된 신호가 기록된다.The PSK modulator 104, which may be configured as a multiplier, multiplies the groove address data of " 1 " or " -1 " by the wobble signal generated by the wobble signal generator 100 to generate groove address data for one wall surface of the groove track. And 0

A carrier with a phase of sin,

The BPSK modulated signal multiplied by t) is recorded.

의 위상을 갖는 캐리어 즉, cos(

t)가 승산된 BPSK 변조된 신호가 기록된다.The PSK modulator 106, which may be configured as a multiplier, multiplies the land address data of " 1 " or " -1 " by the phase shifted wobble signal provided by the phase shifter 102 to land address relative to the other wall surface of the groove. 90 with data

Carrier with a phase of cos (

The BPSK modulated signal multiplied by t) is recorded.

FIG. 11 is a circuit diagram according to an embodiment of a wobble address detection circuit according to the present invention, and includes a photodetector 200, a subtractor 202, a band pass filter (denoted 204: BPF), and a phase locked loop (PLL). ) Circuit 206, multipliers 210, 212, low pass filters 214, 216 (denoted LPF).

The subtractor 202 detects a difference signal (push-pull signal) of the output signal of the photodetecting element 200 divided in two in the radial direction, which may be constituted by a photodiode. Here, the address information is detected from the push pull signal.

시프트해서 위상이 시프트된 워블 클럭 신호를 제공한다.The band pass filter 204 band filters the push-pull signal, and the PLL circuit 206 detects the wobble clock signal from the output of the band pass filter 204. The phase shifter 208 sets the phase of the wobble clock signal detected by the PLL circuit 206 to 90 degrees.

Shift to provide a wobble clock signal whose phase is shifted.

위상에 대해서는 불명확한 모호성(Ambiguity) 문제를 해결하기 위해서 위상 동기 신호가 필요하다. 따라서, 도 7a에 도시된 워블 싱크, 워블 캐리어 신호 및 도 8에 도시된 섹터 마크에 기록된 VFO 신호를 이용하게 된다.In the wobble clock recovery, the BPSK signal or the QPSK signal does not basically have a section in which the signal becomes zero. Therefore, when the PLL circuit 206 full-wave rectifies the push-pull signal to obtain a double speed clock signal, it is almost complete. The clock signal can be detected. The PLL circuit 206 recovers the wobble clock signal at twice the speed and divides the wobble clock signal into two divisions again to detect the wobble clock signal. However, 180 times the 2x clock signal

For phases, phase-locked signals are needed to solve the ambiguity problem. Therefore, the wobble sync, wobble carrier signal shown in FIG. 7A and the VFO signal recorded in the sector mark shown in FIG. 8 are used.

The multiplier 210 multiplies the band-filtered push-pull signal provided from the band pass filter 204 and the wobble clock signal provided from the PLL circuit 206 to generate a harmonic component multiplied by the original signal of the DC term. That is, in the groove track, as shown in Equation 4, the harmonic component twice as large as the original signal (groove address data of the in-phase component) is generated.

위상이 시프트된 워블 클럭신호를 승산하면 DC항으로 된 원 신호와 체배된 고조파 성분이 발생한다. 즉, 랜드 트랙이면 수학식 5에 도시된 바와 같이 원 신호(직교 성분의 랜드 어드레스 데이터)와 2배의 고조파 성분이 발생된다.Multiplier 212 is a band-filtered push-pull signal provided from bandpass filter 204 and 90 provided from phase shifter 208.

Multiplying the phase shifted wobble clock signal generates a harmonic component multiplied by the original signal of the DC term. That is, in the case of the land track, as shown in equation (5), the original signal (land address data of orthogonal components) and twice the harmonic components are generated.

The low pass filter 214 filters the harmonic components from the output of the multiplier 210 to detect the remaining original signal components (phase components). The low pass filter 216 filters the harmonic components from the output of the multiplier 212 to detect the remaining original signal components. That is, groove address information is provided from the low pass filter 214 in the groove track, and land address information is provided from the low pass filter 216 in the land track.

Here, for the wobble signal as shown in FIG. 5 according to the structure shown in FIG. 4, the signal shown in FIG. 12A (a) is detected from the push-pull signal of the subtractor 202 as a signal read from the groove track. 12A (b) is detected from the push-pull signal of the subtractor 202 as a signal read from the land track, and the signal shown in (c) of FIG. 12A is a subtractor 202 as a signal read from the groove track. Is detected from the push-pull signal.

t)를 승산한 결과이고, 도 12a의 (e)에 도시된 신호는 승산기(212)로부터 출력되는 도 12a의 (a)에 도시된 BPSK 변조된 그루브 트랙에서 읽은 신호와 cos(

t)를 승산한 결과이다.The signal shown in (d) of FIG. 12A is the signal read from the BPSK modulated groove track shown in (a) of FIG. 12A output from multiplier 210 and sin (

is a result of multiplying t), and the signal shown in (e) of FIG. 12A is cos () with the signal read from the BPSK modulated groove track shown in (a) of FIG. 12A output from multiplier 212.

It is the result of multiplying t).

t)를 승산한 결과이고, 도 12a의 (g)에 도시된 신호는 승산기(212)로부터 출력되는 도 12a의 (b)에 도시된 BPSK 변조된 랜드 트랙에서 읽은 신호와 cos(

t)를 승산한 결과이다.The signal shown in (f) of FIG. 12A is the signal read from the BPSK modulated land track shown in (B) of FIG. 12A output from multiplier 210 and sin (

is a result of multiplying t), and the signal shown in (g) of FIG. 12A is cos () with the signal read from the BPSK modulated land track shown in (B) of FIG. 12A output from multiplier 212.

It is the result of multiplying t).

t)를 승산한 결과이고, 도 12b의 (i)에 도시된 신호는 승산기(212)로부터 출력되는 도 12a의 (c)에 도시된 BPSK 변조된 그루브 트랙에서 읽은 신호와 cos(

t)를 승산한 결과이다.The signal shown in (h) of FIG. 12B is the signal read from the BPSK modulated groove track shown in (c) of FIG. 12A output from multiplier 210 and sin (

is a result of multiplying t), and the signal shown in (i) of FIG. 12B is cos (a signal read from the BPSK modulated groove track shown in (c) of FIG. 12A output from multiplier 212.

It is the result of multiplying t).

Further, groove address information detected from the groove track provided through the low pass filter 214 for removing harmonic components from the output of the multiplier 210 shown in FIG. 12A (d) is shown in FIG. 12B (j). The land address information detected from the groove track provided from the low pass filter 216 which removes harmonic components from the output of the multiplier 212 shown in FIG. 12A (e) is shown in FIG. 12B (k). As shown in.

Land address information detected from the land track provided via the low pass filter 216 for removing harmonic components from the output of the multiplier 212 shown in (g) of FIG. 12A is shown in (l) of FIG. 12B. The groove address information detected from the land track provided from the low pass filter 214 which removes harmonic components from the output of the multiplier 210 shown in Fig. 12A (f) is shown in Fig. 12B (m). As it is.

The present invention can be effectively applied to a high density optical recording / reproducing system.

의 위상을 가지는 캐리어로 변조된 그루브 어드레스를 기록하고 최내주의 그루브 바로 다음 랜드와의 경계 위치의 벽면에는 90

의 위상차를 가지는 캐리어로 변조된 랜드 어드레스를 기록하는 경우 항상 그루브 트랙에서는 랜드 트랙의 어드레스(섹터 번호)가 큰 값을 갖게 되고 랜드 트랙에서는 그루브 트랙의 어드레스(섹터 번호)가 큰 값을 갖게 된다. 아울러 랜드 어드레스는 직교 성분 신호 성분에서 추출되고 그루브 어드레스는 동상 성분 신호 성분에서 발생하기 때문이 이 둘의 관계를 이용하면 현재 랜드 트랙을 읽고 있는지 그루브 트랙을 읽고 있는지가 분명히 구분되어질 수가 있다.Further, the land track and groove track can be discriminated by the PID addressing structure of the present invention. That is, address information indicating a sector number is sequentially assigned from the inside of the disk to the groove and the land boundary wall, and 0 is set on the inner circumferential side wall with respect to the groove of the innermost circumference.

Record the groove address modulated by a carrier with a phase of 90 and write it on the wall at the boundary position with the land immediately after the groove of the innermost circumference.

When recording a land address modulated by a carrier having a phase difference of, a land track address (sector number) has a large value in a groove track, and a groove track address (sector number) has a large value in a land track. In addition, since the land address is extracted from the orthogonal component signal component and the groove address is generated from the in-phase component signal component, the relationship between the two can clearly distinguish between reading the current land track and the groove track.

In addition, not only one piece of address information is recorded for one area, for example, an address of an adjacent land track may be recorded, instead of only the address of the sector in an area corresponding to one sector of the groove track. have. In this case, the address of the adjacent track may vary depending on the length of the corresponding sector and the characteristics of the modulated signal. In this way, a plurality of addresses can be read while one sector is read, so that even if any one of the address information (groove or land address information) becomes unreadable, the address cannot be read from the information on the other disk and the information on the other disk. You can also infer information.

As described above, the present invention can solve the overhead problem of the conventional PID addressing method using the uneven type prepit, and solve the problem of being unable to be applied to the land / groove recording method of the conventional wobble address method. It works.

위상차를 주어서 변조된 워블 어드레스 정보를 각 트랙에서 이를 읽으면 QPSK 신호가 되도록 기록함으로써 보다 많은 데이터를 기록할 수 있고, 워블 신호의 주기가 짧아도 되고, 워블 신호가 없어지는 구간이 발생하지 않기 때문에 워블 클럭 신호를 복원하는 데 유리한 장점이 있다.In addition, the present invention provides a wobble signal having a predetermined phase relationship, that is, the phase of the wobble between adjacent tracks.

The wobble clock can be recorded by reading the wobble address information modulated by the phase difference in each track so that it becomes a QPSK signal, allowing more data to be recorded, the wobble signal period being shorter, and no wobble signal disappearing section. There is an advantage in recovering the signal.

Claims (56)

A method of addressing physical identification information using wobble on an optical recording / reproducing medium: Phase modulation of the first address information indicating the physical identification information is performed on one of the wall surfaces on either side of one track of the groove or the land track by using the first wobble signal, and on the other wall surface, the first wobble signal is different from the first wobble signal. Phase modulating and recording second address information using a second wobble signal out of phase by a predetermined angle; Wherein each of the first and second address information further includes address information of a corresponding track as well as address information of a corresponding track. The phase relationship of the wobble signal has a phase difference of 90 degrees with respect to both wall surfaces of the groove track, and the signal read from each track is configured to be a quadrature phase shift keying (QPSK). Characterized in that the method. A groove address as first address information is recorded as one in-phase component signal of QPSK on one wall of the groove track, and second address information as a quadrature component signal of QPSK on the other wall of the groove track. An in-land address is recorded. 2. The land address as the first address information is recorded on one wall of the groove track as an in-phase component signal of QPSK, and the second address information is a quadrature component signal of QPSK on the other wall of the groove track. And an in-groove address is recorded. delete The method of claim 1, wherein (b) recording information for each phase to adjust the initial phase of the wobble signal in a predetermined unit. The method of claim 1, wherein each of the first and second address information is repeatedly recorded three or more times in a minimum recording unit. 2. The method of claim 1, wherein each of the first and second address information includes a wobble sync having synchronization information for determining a start position of a wobble PID signal, a wobble carrier composed of pure wobble signals not including PID data, and address information. And a PID data and an error detection code which are phase-modulated with a wobble carrier. 9. The method of claim 8, wherein the period of the PID data is set to be at least 1.5 times and less than 8 times the period of the wobble signal. 9. The method of claim 8, wherein the period of the wobble signal is set to be larger than 50 times and smaller than 450 times than the period of channel data actually recorded on the optical recording / reproducing medium. 10. The method of claim 8, wherein the wobble sync has a structure that can be detected even after being modulated or demodulated. 9. The method of claim 8, wherein the wobble sync is in a pseudo random sequence. 13. The method of claim 12, wherein the wobble sync is in Barker Code. The method of claim 1, wherein (b) recording a sector mark at the head of the minimum recording unit of each track. 15. The method of claim 14, wherein the sector mark has a separate structure according to even / oddity tracks in the groove track and the land track, and the first sector mark of each track has a structure separate from the remaining sector marks. How to. The sector mark of each even groove and land track is a mirror area, a track mark having information for distinguishing whether the odd / excellent track is a VFO signal having phase synchronization information, and each odd groove and land. A sector mark of a track is a mirror area, a mirror area, and a VFO signal. 16. The first sector mark of each even groove and land track is a mirror area, a track mark, a mirror area, a track mark, and a VFO signal, and the first sector mark of each odd groove and land track is a mirror area. And a track mark, a mirror area, a mirror area, and a VFO signal. In an optical recording / reproducing system provided with a light detecting element, first address information indicating physical identification information is phase-modulated by using a first wobble signal on either wall of either side of a track of a groove or a land track. And a second wobble signal having a predetermined phase relationship with the first wobble signal on the other wall surface to detect the wobble address from an optical recording / reproducing medium in which the second address information is phase modulated. : (a) a first signal and a second having a harmonic component by multiplying the difference signal of the detection signal of the photodetecting device divided into two in the radial direction by the first and second wobble signals having a predetermined phase relationship with each other; Providing an output signal; And (b) removing first harmonic components from said first and second output signals and restoring first address information and second address information from an original signal component having a phase component. 19. The method of claim 18, wherein the method is and (c) determining the land / groove track using the correlation of the land track restored in the step (b) and the size of the address data on the groove track. In a circuit for encoding an address using a wobble for an optical recording / reproducing system: A provider for generating a first wobble signal and providing a second wobble signal out of phase with the generated first wobble signal by a predetermined angle; And Phase-modulate first address information indicating physical identification information on one of the wall surfaces on either side of one track of a groove or land track, and use the second wobble signal on the other wall surface. A phase modulator to phase modulate the second address information, Wherein each of the first and second address information further includes address information of a corresponding track as well as address information of a corresponding track. The phase relationship of the wobble signal has a phase difference of 90 degrees with respect to both wall surfaces of the groove tracks, so that address information is modulated with BPSK (Phase Shift Keying) on both wall surfaces of each groove track. Is a quadrature phase shift keying (QPSK) signal. The method of claim 20, wherein the provider A wobble generator generating a first wobble signal having a predetermined frequency; And Phase of the first wobble signal is 90

And a phase shifter to shift to provide a second wobble signal that is phase shifted. 21. The apparatus of claim 20, wherein the phase modulator is A first multiplier for multiplying the groove address data and the first wobble signal to provide a wobble signal in which the groove address, which is the first address information, is modulated in the in-phase component of the QPSK signal; And And a second multiplier for multiplying the land address data by the second wobble signal to provide a wobble signal in which the land address, which is the second address information, is modulated in an orthogonal component among the QPSK signals. 21. The apparatus of claim 20, wherein the phase modulator is A first multiplier configured to multiply the land address data by the first wobble signal to provide a wobble signal in which the land address, which is the first address information, is modulated from an in-phase component among the QPSK signals; And And a second multiplier for multiplying the groove address data by the second wobble signal to provide a wobble signal in which the groove address, which is the second address information, is modulated in an orthogonal component among the QPSK signals. delete 21. The circuit according to claim 20, wherein the address information is repeatedly recorded three or more times in the minimum recording unit. 21. The method of claim 20, wherein each of the first and second address information includes a wobble sync having synchronization information for determining a start position of a wobble PID signal, a wobble carrier composed of a pure wobble signal not including PID data, and address information. And a PID data and an error detection code which are phase-modulated with a wobble carrier. 28. The circuit of claim 27, wherein the period of the PID data is set to be at least 1.5 times and less than 8 times the period of the wobble signal. 28. The circuit according to claim 27, wherein the period of the wobble signal is set to be larger than 50 times and smaller than 450 times than the period of the channel data actually recorded on the optical recording / reproducing medium. 28. The circuit of claim 27, wherein the wobble sync has a structure that can be detected even after being modulated or demodulated. 28. The circuit of claim 27, wherein the wobble sync is in a pseudo random sequence. 32. The circuit of claim 31 wherein the wobble sync is in Barker Code. 21. The circuit according to claim 20, wherein, when mastering the recording medium, a sector mark is recorded at the head of the minimum recording unit of each track. 34. The structure of claim 33, wherein the sector mark has a separate structure according to the even / odd track in the groove track and the land track, and the first sector mark of each track has a structure separate from the remaining sector marks. Circuit. 35. The sector mark of each even groove and land track is a mirror area, a track mark having information for distinguishing whether the odd / excellent track is a VFO signal, and a VFO signal having phase synchronization information. And a sector mark of the track is a mirror area, a mirror area, and a VFO signal. 35. The first sector mark of each even groove and land track is a mirror area, a track mark, a mirror area, a track mark, a VFO signal, and the first sector mark of each odd groove and land track is a mirror area. And a track mark, a mirror area, a mirror area, and a VFO signal. In an optical recording / reproducing system provided with a light detecting element, first address information indicating physical identification information is phase-modulated by using a first wobble signal on either wall of either side of a track of a groove or a land track. And a circuit for detecting a wobble address from an optical recording / reproducing medium in which the second address information is phase modulated on the other wall by using a second wobble signal that is out of phase with the first wobble signal by a predetermined angle. : A first wobble clock signal is detected using a difference signal (push-pull signal) of the detection signal of the photodetecting element divided into two in the radial direction, and a second phase having a predetermined phase relationship with the detected first wobble clock signal A wobble clock recoverer providing a wobble clock signal; And And a phase demodulator for recovering groove and land address information, which are first and second address information, from the push-pull signal using the first and second wobble clock signals. 38. The system of claim 37, wherein the wobble clock recoverer A phase locked loop (PLL) circuit for detecting a first wobble clock signal from the push-pull signal; And Phase of the first wobble clock signal is 90

And a phase shifter shifted to provide a phase shifted second wobble clock signal. 38. The apparatus of claim 37, wherein the phase demodulator A first multiplier configured to multiply the first wobble clock signal by the push-pull signal to provide a first output signal of an original signal component and a harmonic component; A second multiplier configured to multiply the second wobble clock signal by the push-pull signal to provide a second output signal of an original signal component and a harmonic component; A first low pass filter for low-pass filtering the output of the first multiplier to detect only original signal components having first address information; And And a second low pass filter for low pass filtering the output of the second multiplier to detect only the original signal component having the second address information. In a recording medium having a groove / land recording method and capable of recording / playback: The first address information indicating the physical identification information is phase-modulated on one of the wall surfaces on either side of one track of the groove or the land track, and the other wall surface is different from the first wobble signal. The second address information is phase modulated with a second wobble signal having a phase difference by a predetermined angle, Wherein each of the first and second address information further includes address information of a corresponding track as well as address information of a corresponding track. The phase relationship of the wobble signal has a phase difference of 90 degrees with respect to both wall surfaces of the groove tracks, so that address information is modulated with BPSK (Phase Shift Keying) on both wall surfaces of each groove track. And the signal read from is configured to be a quadrature phase shift keying (QPSK) signal. delete 41. The recording medium of claim 40, wherein the land / groove track can be determined by using a correlation between the land track and the size of the address data on the groove track. 41. The recording medium of claim 40, wherein each groove track further has an information area for adjusting the initial phase of the wobble signal in a predetermined unit. 45. The recording medium of claim 44, wherein the information area is comprised of a mirror. 41. The recording medium of claim 40, wherein the wobble address information is repeatedly recorded three or more times in a minimum recording unit. 41. The method of claim 40, wherein the wobble address information is phased as a wobble carrier having synchronization information for determining a start position of a wobble PID signal, a wobble carrier composed of a pure wobble signal not including PID data, and a wobble carrier having address information. A recording medium comprising modulated PID data and an error detection code. 48. The recording medium of claim 47, wherein the period of the PID data is set to be at least 1.5 times and less than 8 times the period of the wobble signal. 48. The recording medium of claim 47, wherein the period of the wobble signal is set to be larger than 50 times and smaller than 450 times than the period of data actually recorded on the optical recording / reproducing medium. 48. The recording medium of claim 47, wherein the wobble sync has a structure that can be detected even after being modulated or demodulated. 48. The recording medium of claim 47, wherein the wobble sync is in a pseudo random sequence. 52. The recording medium of claim 51, wherein the wobble sync is made of a Barker code. A recording medium according to claim 40, wherein a sector mark is arranged at the head of the minimum recording unit of each track. 54. The method of claim 53, wherein the sector mark has a separate structure according to the even / odd track in the groove track and the land track, and the first sector mark of each track has a structure separate from the remaining sector marks. Recording medium. The sector mark of each of the even grooves and land tracks is a mirror area, a track mark having information for distinguishing whether the odd / excellent track is a VFO signal, and a phase fogging information, each odd groove and land. A sector mark of a track comprises a mirror area, a mirror area, and a VFO signal. 55. The first sector mark of each even groove and land track is a mirror area, a track mark, a mirror area, a track mark, and a VFO signal, wherein the first sector mark of each odd groove and land track is a mirror area. And a track mark, a mirror area, a mirror area, and a VFO signal.

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