KR100677089B1 - Method of PID addressing using wobble signal and detecting method thereof, encoding circuit of wobble address and detecting circuit thereof and recording medium - Google Patents

Abstract

위상차를 갖는 인접 두 그루브 트랙간의 워블 신호를 이용하여 변조된 어드레스 정보가 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, each groove track is divided into an odd groove track and an even groove track to phase modulate address information indicating physical identification information by using wobble signals having a predetermined angle phase difference between two adjacent groove track units. 90 by recording on groove tracks

By using the wobble signal between two adjacent groove tracks having a phase difference, the modulated address information is recorded to be a quadrature phase shift keying (QPSK) signal so that more data can be recorded, and a section in which the wobble signal disappears does not occur. It is advantageous to recover the wobble clock signal.

Description

Method of PID addressing using wobble signal and detecting method including, encoding circuit of wobble address and detecting circuit according to recording 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 signal, a detection method thereof, a wobble address encoding circuit, a detection circuit thereof, and a recording medium in 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 header part. It is composed of a PA (postamble) area and the like for adjusting the initial state for the modulation of 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 is a problem that more information is needed to accurately determine whether or not it is a 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.

According to another aspect of the present invention, an address signal that is phase-modulated by using a wobble phase difference between adjacent groove tracks by using a change in both wall surfaces of a groove track (or a land track) is obtained for each groove track. This method provides a method of addressing a PID such that a signal becomes a quadrature phase shift keying (QPSK) signal when the address signals of two adjacent groove tracks are summed.                         

A further object of the present invention is a method of detecting address information from a recording medium in which address information indicating physical identification information in each groove track (or land track) is phase-modulated using a wobble having a predetermined angle phase difference between adjacent groove tracks. To provide.

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 provide a recording medium in which address information indicating physical identification information in each groove track (or land track) is phase-modulated by using a wobble having a predetermined angle phase difference between adjacent groove tracks.

In order to achieve the above objects, a PID addressing method using a wobble signal according to the present invention is a method for addressing physical identification information (PID) using a wobble signal on an optical recording / reproducing medium: a groove track or a land track. Phase modulating and recording wobble address information indicating physical identification information using a wobble signal for any one, wherein the wobble address information has a predetermined phase relationship so that the wobble address information can be read in a track in which wobble address information is not recorded. And recording using wobble signals.

A wobble address detection method according to the present invention is an optical recording / reproducing system having a light detecting element, wherein the wobble address detection method indicates physical identification information using wobble signals having a predetermined phase relation with respect to either a groove track or a land track. A method of detecting a wobble address from an optical recording / reproducing medium in which wobble address information is phase modulated, comprising: multiplying a difference signal of a detection signal of a photodetecting element divided into two radial directions and a wobble signal having a predetermined angle phase difference from each other; Providing first and second output signals each having an original signal and a harmonic component, and restoring groove address information and land address information from the original signal after removing the harmonic components from the first and second output signals. It is characterized by.

A wobble address encoding circuit according to the present invention is a circuit for encoding an address using a wobble signal for an optical recording / reproducing system, comprising: a second wobble signal having a predetermined phase relationship between a first wobble signal and a first wobble signal; An address indicating physical identification information by using a first wobble signal for one track in a unit of adjacent odd and even two tracks divided by the provider track and the even track for the provider and the groove or land track provided. And a phase modulator for phase modulating the information and phase modulating the address information using the second wobble signal for the other tracks.

The wobble address detection circuit according to the present invention is an optical recording / reproducing system provided with a light detecting element, and has a predetermined phase relationship with each other in units of two adjacent tracks divided into odd and even tracks for either a groove or a land track. A circuit for detecting a wobble address from an optical recording / reproducing medium in which address information indicating physical identification information is phase-modulated by using wobble signals having a signal, comprising: a difference of detection signals of the photodetecting device divided into two in the radial direction A wobble clock decompressor for detecting a first wobble clock signal using a signal (push-pull signal) and providing a second wobble clock signal having a predetermined phase relationship with the detected first wobble clock signal; And a phase demodulator for recovering address information from the push-pull signal using the two wobble clock signals. Doing.

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: divided into odd numbers and even tracks, and physical identification information is obtained using wobble signals having a predetermined phase relationship. The wobble address information is characterized in that it has groove tracks that are phase-modulated and recorded, and land tracks having wobble address information that is quadrature phase-modulated by wobble address information of two adjacent groove tracks.

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 addressing structure using a wobble as shown in FIG.

4 is a diagram showing a PID structure using wobble recorded on both wall surfaces of a groove track according to an embodiment of the present invention. The present invention is an example of a disc that needs to separately access a physical position on a land / groove. For example, a disc using a land / groove recording method, which is applied when the angular velocity between adjacent tracks is constant such as ZCLV (Zoned Constant Linear Velocity) or CAV (Constant Angular Velocity). Since the changes are always the same, one-beam can be used for mastering.

위상을 가진 워블 신호를, "1"일 때는 180

의 반대 위상을 가진 워블 신호를 기록한다. 이때, 그루브 트랙을 기수 그루브 트랙과 우수 그루브 트랙으로 구분하고, 워블 클럭의 위상을 일 실시예로서 기수 그루브 트랙에 대해서는 0

의 위상을 가진 캐리어를 사용하고, 우수 그루브 트랙에 대해서는 90

위상이 틀어진 캐리어를 사용한다. 다른 예로서, 우수 그루브 트랙에 대해서 0

의 위상을 가진 캐리어를 사용하고, 기수 그루브 트랙에 대해서는 90

위상이 틀어진 캐리어를 사용할 수 있다.Phase modulation is used to modulate address data on the groove track. 0 when the address data bit is "0"

Wobble signal with phase, 180 when "1"

Record the wobble signal with the opposite phase of. At this time, the groove track is divided into an odd groove track and an even groove track, and the phase of the wobble clock is set to 0 for the odd groove track.

Use a carrier with a phase of 90 for an excellent groove track

Use a carrier out of phase. As another example, zero for even groove tracks.

Use a carrier with a phase of 90 and for a radix groove track

A carrier out of phase can be used.

In addition, when one beam is used, the address of the groove is recorded on both walls of the groove track. In the case of land, the address of the adjacent groove and the number of sectors per track of the region are used when the ZCLV is applied. Addressing can be done indirectly. In the case of using ZLCV, the number of sectors per track is determined so that the current sector address can be known by knowing the sector address of the adjacent track.

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.

In this way, the signal read from the land track is the sum of the two, that is, the in-phase component (hereinafter referred to as the in-phase component), and the address information of the even groove track is modulated and the quadrature component (hereinafter, referred to as orthogonal) Component) is a quadrature phase shift keying (QPSK) modulated signal, which is a signal obtained by modulating and combining the address information of an odd groove track, and a BPSK (Bi-Phase Shift Keying) modulated signal is recorded for each groove.

In other words. The wobble signal of the odd groove track can be expressed as follows.

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

The wobble signal of the land track can be represented 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 the groove 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 성분 은 버리고 원 성분을 검출해낸다. The wobble signal of the odd groove track represented by Equation 1 is represented by the carrier sin (

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

t)를 승산해서 승산된 결과를 저역 필터링해서 고조파 성분을 버리고 원 성분만을 검출한다. The wobble signal of the even groove track represented by Equation 2 is represented by carrier cos (

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

t)를 승산해서 승산된 결과를 저역 필터링해서 고조파 성분을 버리고 원 성분만을 검출하면 기수 그루브 어드레스가 검출되고, 동시에 랜드 트랙의 워블 신호는 캐리어 cos(

t)를 승산해서 승산된 결과를 저역 필터링해서 고조파 성분을 버리고 원 성분만을 검출하면 우수 그루브 어드레스가 검출된다. The wobble signal of the QPSK modulated land track represented by Equation 3 is expressed by the carrier sin (

Multiplying t) by multiplying the multiplied result by discarding the harmonic components and detecting only the original components, the odd groove address is detected.

If the result of multiplying by t) is multiplied by low pass filtering to discard harmonic components and only original components are detected, even groove addresses are detected.

In other words, address detection in the groove track is equal to the decoding of the bi-phase modulated signal. However, the land track will be somewhat different. The address detected in the land track varies depending on whether it is an odd land track or an even land track. In other words, for the disc's radial direction, the innermost groove track is called the first radix groove track, the next groove track is called the first storm groove track, and the land track between the first radix groove track and the first rain groove track is first. If you define the first nose land track and the next land track the first storm land track, the nose land track detects the low address in the frostbite component, that is, the address of the inner rider groove, while in the storm land track, The high address, that is, the address of the odd groove located outside, is detected. However, as for the orthogonal components in the odd land track and the even land track, the address of the even groove between the odd land track and the even land track is detected.

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

t), cos(

t))을 이용하면 랜드 어드레스를 검출할 수 있다. The wobble shape of the left and right walls of the land track is different, and these two different wobbles

Since the wobble signal read from the land track becomes a QPSK signal naturally because of the phase difference of

t), cos (

t)), the land address 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 detecting a magnitude of a signal at a predetermined period without multiplying a carrier by a phase modulated signal and then 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. 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. Therefore, the defect size that can be corrected by increasing the ECC processing unit as much as possible will be reduced. It is desirable to keep the size of the correctable defect required in the 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 the shorter the period, the frequency of the wobble signal. 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 is easily performed by recording a burst signal having only a carrier of a predetermined period or by recording a carrier signal as a pilot tone to detect a wobble carrier. Since various methods are devised, especially in the case of a wobble PID, since it is technically difficult to insert a carrier in a pilot tone method, it is preferable to insert a burst signal having only a certain period of wobble carrier signal. 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. Of course, after demodulating the address data according to the structure of the present invention, it is possible to distinguish whether the current track is an odd track, an even track, a land track, or a groove track. In the case of groove tracks, this determines whether the data is restored to a carrier having a phase of 0 degrees or a carrier of phase of 90 degrees. By comparing the address information detected in the branch components, it is possible to determine the information (base / excellent land track) for the track currently being read or written.

Even if the address information is not normally demodulated and read, when the current track position can be determined to be an excellent track, an odd track, a land, or a groove, it is possible to know whether the address is misread and increase the reading speed. There is this.

As shown in Fig. 9A, the sector mark of the odd track of the even groove track or the even land track is composed of the mirror area, the track mark and the VFO signal, and the sector mark of the odd groove track or the odd land track is equal to the sector mark of the even track. Unlike FIG. 9B, the mirror area is arranged 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 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.

FIG. 10 is a circuit diagram according to an embodiment of a wobble address encoding circuit according to the present invention, and includes a wobble signal generator 100, a phase shifter 102, a selector 104, and a PSK modulator 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.

The selector 104 selects the wobble signal generated by the wobble signal generator 100 in the odd groove track according to the odd / high groove track signal (O / E groove), and is provided from the phase shifter 102 in the even groove track. Select the wobble signal whose phase is shifted.

의 위상을 갖는 캐리어 즉, sin(

t)가 승산된 BPSK 변조된 신호가 기록되고, 우수 그루브 트랙에는 어드레스 데이터와 90

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 groove address data of " 1 " or " -1 " by the wobble signal selected by the selector 104, so that the address groove and zero are assigned to the odd groove track.

A carrier with a phase of sin,

The BPSK modulated signal multiplied by t) is recorded, and the even groove track has 90% of the address 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 by two divisions 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, if the odd groove track is an original signal (odd groove address data) and a harmonic component multiplied by two, as shown in Equation 4, the original signal (odd groove address data) is shown in Equation 6 if it is a land track. ) And doubled harmonic components are generated. Here, if the odd land track, the odd groove groove address data in the radial direction is detected, and if it is the even land track, the odd odd groove address data in the radial direction is detected.

위상이 시프트된 워블 클럭 신호를 승산하면 DC항으로 된 원 신호와 체배된 고조파 성분이 발생한다. 즉, 우수 그루브 트랙이면 수학식 5에 도시된 바와 같이 원 신호(우수 그루브 어드레스 데이터)와 2체배된 고조파 성분이 발생되고, 랜드 트랙이면 수학식 6에 도시된 바와 같이 원 신호(우수 그루브 어드레스 데이터)와 2체배된 고조파 성분이 발생된다. Multiplier 212 is a low pass filtered push-pull signal provided from band pass 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, an even groove track generates a harmonic component doubled by the original signal (good groove address data) as shown in Equation 5, and a land signal (good groove address data) as shown in Equation 6 in the case of a land track. ) And doubled 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, an odd groove address is provided from the low pass filter 214 in the odd groove track, an even groove address is provided from the low pass filter 216 in the even groove track, and low pass filters 214 and 216 in the land track. Provides land addresses of in-phase components and orthogonal components.

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

t)를 승산한 결과이고, 도 12a의 (e)에 도시된 신호는 승산기(210)로부터 출력되는 도 12a의 (b)에 도시된 QPSK 변조된 랜드 트랙 신호와 sin(

t)를 승산한 결과로부터 검출되는 동상 성분이고, 도 12a의 (f)에 도시된 신호는 승산기(212)로부터 출력되는 도 12a의 (b)에 도시된 QPSK 변조된 랜드 트랙 신호와 cos(

t)를 승산한 결과로부터 검출되는 직교 성분이다. 도 12b의 (g)에 도시된 신호는 승산기(212)로부터 출력되는 도 12a의 (c)에 도시된 우수 그루브 트랙에서 읽은 신호와 sin(

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

is a result of multiplying by t), and the signal shown in (e) of FIG. 12A is the sins (QPSK modulated land track signal shown in (b) of FIG. 12A output from multiplier 210).

The in-phase component detected from the result of multiplying t), and the signal shown in (f) of FIG. 12A are cos () with the QPSK modulated land track signal shown in (b) of FIG. 12A output from multiplier 212.

It is an orthogonal component detected from the result of multiplying t). The signal shown in (g) of FIG. 12B is the signal read from the even groove track shown in (c) of FIG. 12A output from the multiplier 212 and sin (

It is the result of multiplying t).

In addition, the address information of the odd groove track provided through the low pass filter 214 is as shown in FIG. 12B, and in-phase provided simultaneously from the low pass filter 214 and the low pass filter 216. The land address information of the component and the land address information of the orthogonal component are as shown in (i) and (j) of FIG. 12B, and the address information of the even groove track provided from the low pass filter 216 is shown in FIG. as shown in k).

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

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. Through this method, a plurality of address information can be read while one sector is read, so that even if any one address information (groove or land address information) cannot be read, it can be read from the read address information and the information on the other disk. You can also infer missing address 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 갖는 인접한 기수 그루브와 우수 그루브 트랙간의 워블 신호를 이용하여 변조된 두 그루브 트랙의 어드레스 정보를 더하여 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 is 90

More data can be recorded by adding the address information of two groove tracks modulated using a wobble signal between adjacent odd grooves and even groove tracks having a phase difference to become a QPSK signal, and the period of the wobble signal may be short, There is an advantage in restoring the wobble clock signal because the section in which the signal disappears does not occur.

Claims (59)

A method of addressing physical identification information (PID) using a wobble signal on an optical recording / reproducing medium: (a) phase modulating and recording wobble address information indicating physical identification information using a wobble signal for either the groove track or the land track, The wobble address information is recorded using wobble signals having a phase difference by a predetermined angle so that the wobble address information can be read from a track on which wobble address information is not recorded. The wobble address information is not only address information of a corresponding groove track but also address information of an adjacent land track. Method further comprising a. The phase relationship of the wobble signal has a phase difference of 90 degrees with respect to the even groove track and the odd groove track, so that a signal read from the land track is a quadrature phase shift keying (QPSK) signal. And configured to be. The address information of claim 1, wherein in the step (a), each groove track is divided into an odd groove track and an even groove track, and address information indicating physical identification information using wobble signals having a predetermined angle phase difference between two adjacent groove track units. Phase modulating and recording each phase in the groove track. 4. The method of claim 3, wherein the phase modulation is Bi-Phase Shift Keying (BPSK) for each groove track, and the combined modulated address information of the two adjacent groove tracks is QPSK. 4. The method according to claim 3, wherein the wobble address information is recorded including address information of the adjacent land track as well as address information of the corresponding groove track. The method of claim 1, wherein (b) recording information for each phase in the initial phase of the wobble signal in a predetermined unit. The method of claim 1, wherein the address information is repeatedly recorded three or more times in a minimum recording unit. 2. The method of claim 1, wherein the address information is phase modulated by 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 a wobble carrier having address information. PID data and error detection code. 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. A method of recording information on an optical recording / reproducing medium: (a) recording data on the optical recording / reproducing medium by a quadrature phase modulation scheme using carrier signals having a predetermined phase relationship. 19. The method of claim 18, wherein the quadrature phase modulation method uses a wobble change of a groove track and records wobble address data using a wobble carrier signal having a phase difference of 90 degrees with respect to the even groove track and the odd groove track. Characterized in that the method. In an optical recording / reproducing system provided with an optical detection element, optical recording in which phase-modulated wobble address information indicating physical identification information is used by using wobble signals having a predetermined phase relationship with respect to either a groove track or a land track. In a method of detecting a wobble address from a playback medium: (a) multiplying the difference signal of the detection signal of the photodetecting element divided into two in the radial direction and the wobble signals having a predetermined phase relationship with each other to provide first and second output signals each having an original signal and a harmonic component; step; And (b) recovering groove address information and land address information from the original signal after removing the harmonic components from the first and second output signals. 21. The method of claim 20, wherein in the step (b), the odd groove groove address is restored from the BPSK (Bi-Phase Shift Keying) modulated wobble signal in the odd groove groove track for the groove track divided into the odd and even groove tracks. And recovering the even groove address from the BPSK modulated wobble signal on the track, and recovering the land address by detecting in-phase and quadrature components from the quadrature phase shift keying (QPSK) modulated wobble signal. In a circuit for encoding an address using a wobble signal for an optical recording / reproducing system: A provider for providing a second wobble signal out of phase with the first wobble signal by a predetermined angle; And Address information indicating physical identification information is obtained by using the first wobble signal for one track in the unit of adjacent odd and even two tracks divided into odd and even tracks for one track of a groove or land track. A phase modulator for phase modulating and phase modulating address information using the second wobble signal for another track; Wherein the wobble address information further includes address information of the adjacent land track as well as address information of the corresponding groove track. 23. The circuit of claim 22, wherein the phase modulation is phase shift keying (BPSK) modulation for each groove track. The method of claim 22, wherein the provider A wobble signal generator for generating a first wobble signal of a predetermined frequency; And Phase of the first wobble signal is 90

And a phase shifter to shift to provide a second wobble signal whose phase is shifted. 23. The apparatus of claim 22, wherein the phase modulator phase modulates address information indicating physical identification information using the first wobble signal for an odd groove track for each groove track divided into an odd groove track and an even groove track. And phase-modulating address information on the even groove track using the second wobble signal. 23. The apparatus of claim 22, wherein the phase modulator phase modulates address information indicating physical identification information using a first wobble signal for an even groove track for each groove track divided into an odd groove track and an even groove track. And a groove track phase modulates address information using the second wobble signal. 23. The circuit of claim 22, wherein the signal read from the land track is a quadrature phase shift keying (QPSK) signal. 23. The circuit of claim 22, wherein the address information further includes land address information of adjacent tracks as well as groove address information of a corresponding track. 23. The circuit according to claim 22, wherein the address information is repeatedly recorded three or more times in the minimum recording unit. 24. The method of claim 22, wherein the address information is phase modulated by 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 a wobble carrier having address information. A circuit comprising the PID data and an error detection code. 31. The circuit of claim 30, 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. 31. The circuit according to claim 30, 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. 31. The circuit of claim 30, wherein the wobble sync has a structure that can be detected even after being modulated or demodulated. 31. The circuit of claim 30, wherein the wobble sync is in a pseudo random sequence. 35. The circuit of claim 34, wherein the wobble sync is in Barker Code. The circuit according to claim 22, wherein, when mastering the recording medium, a sector mark is recorded at the head of the minimum recording unit of each track. 37. The method of claim 36, 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. 38. 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. And a sector mark of the track is a mirror area, a mirror area, and a VFO signal. 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 having an optical detection element, a physical identification is made by using wobble signals having a predetermined phase relationship with each other in units of adjacent tracks divided into odd tracks and even tracks for either grooves or land tracks. A circuit for detecting a wobble address from an optical recording / reproducing medium in which address information indicating information is phase modulated: 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 address information from the push-pull signal using the first and second wobble clock signals. 41. The method of claim 40, wherein the wobble clock decompressor A 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 shifting to provide a second wobble clock signal whose phase is shifted. 41. The apparatus of claim 40, wherein the phase demodulator is 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; And And a second low pass filter for low-pass filtering the output of the second multiplier to detect only original signal components. 43. The apparatus of claim 42, wherein an odd groove track is demodulated from a bi-phase shift keying (BPSK) modulated wobble signal through the first or second low pass filter for an odd groove track, and the second groove for a even groove track. Or a good groove address demodulated from a BPSK modulated wobble signal through a first low pass filter, and demodulating from a quadrature phase shift keying (QPSK) modulated wobble signal through the first and second low pass filters if the track is a land track. And land addresses of the in-phase component and the quadrature component are provided. In a recording medium having a groove / land recording method and capable of recording / playback: Groove tracks, which are divided into odd and even tracks, in which wobble address information indicating physical identification information is phase-modulated and recorded using wobble signals having a phase difference by a predetermined angle; And Land tracks having wobble address information orthogonally phase modulated by wobble address information of two adjacent groove tracks, Wherein the wobble address information further includes address information of a corresponding land track as well as address information of an adjacent land track. 45. The method of claim 44, wherein the phase relationship of the wobble signal has a phase difference of 90 degrees with respect to the even groove track and the odd groove track, and a BPSK (Bi-Phase Shift Keying) modulated address for each groove track using one beam. A recording medium, wherein information is recorded. 45. The recording medium of claim 44, wherein the wobble address information further includes address information of an adjacent land track as well as address information of a corresponding groove track. 45. The recording medium of claim 44, further comprising an area including information for adjusting the initial phase of the wobble signal in a predetermined unit of each groove track. 48. The recording medium of claim 47, wherein the area is comprised of a mirror area. 45. The recording medium of claim 44, wherein the wobble address information is repeatedly recorded three or more times in a minimum recording unit. 45. The method of claim 44, wherein the wobble 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 a wobble carrier having address information. A recording medium comprising modulated PID data and an error detection code. 51. The recording medium of claim 50, 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. 51. The recording medium of claim 50, 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. 51. The recording medium of claim 50, wherein the wobble sync has a structure that can be detected even after being modulated or demodulated. 51. The recording medium of claim 50, wherein the wobble sync is in a pseudo random sequence. 55. The recording medium of claim 54, wherein the wobble sync is made of a Barker code. 45. The recording medium of claim 44, wherein a sector mark is arranged at the head of the minimum recording unit of each track. 57. The method of claim 56, 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. 59. The sector mark of each even groove and land track is a mirror area, a track mark having information for distinguishing whether the card is an odd / excellent track, or a VFO signal having phase synchronization information. A sector mark of a track comprises a mirror area, a mirror area, and a VFO signal. 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.

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