KR19980046875A - Optical disc preformatting method and apparatus and information recording method and apparatus - Google Patents

Abstract

The present invention relates to an optical disc preformatting apparatus for preformatting an auxiliary signal on an optical disc.

The optical disc preformatting device pre-formats an auxiliary signal for specifying the unit recording capacity of data in at least one bit at one cycle of the carrier signal and preformats it in the Vulsksk. The carrier signal is changed in phase according to the logic value of the auxiliary signal.

As a result, the track of the optical disc is divided into unit recording sections of small size. Accordingly, the optical disc preformatting method and apparatus can improve the recording density and random access characteristics of the optical disc.

Description

Optical disc preformatting method and apparatus and information recording method and apparatus

1 is a diagram schematically showing an optical disc in which an auxiliary signal is preformatted by the wobbling preformat method.

2 is a block diagram of a conventional auxiliary signal preformatting device for preformatting an auxiliary signal on an optical disc in a wobbling manner.

3 is an operational waveform diagram for each part shown in FIG.

4 is a block diagram of a conventional optical disc recording apparatus for recording user data on an optical disc on which an auxiliary signal is preformatted by a wobbling method.

5 is a detailed block diagram of the carrier signal detector shown in FIG.

6 is a detailed block diagram of the auxiliary signal decoder shown in FIG.

Fig. 7A or 6A is an operational waveform diagram for each part of the auxiliary signal decoder shown in Fig. 6;

7B is an operation waveform diagram of the reference signal generator and recording information processor shown in FIG.

8 is a block diagram of an auxiliary signal preformatting device according to an embodiment of the present invention.

9 is an operating waveform diagram of each part of the circuit shown in FIG.

10 is a block diagram of an optical disc recording apparatus according to an embodiment of the present invention.

11 is a detailed block diagram of an auxiliary signal decoder shown in FIG. 10;

12 is an operational waveform diagram for each part of the circuit shown in FIG.

13 is a detailed block diagram of the dual phase clock regenerator shown in FIG.

14 is an operating waveform diagram of each part of the circuit shown in FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optically accessed optical discs, and more particularly, to a method and apparatus for preformatting an auxiliary signal for guiding a driving device onto an optical disc. The present invention also relates to a method and apparatus for recording information on an optical disc on which an auxiliary signal is preformatted.

In general, the recording medium on which information is recorded must be preformatted according to a predetermined rule. The preformat signal is added to the recording medium in various forms so that the recording medium can be stably driven by the recording medium driving apparatus. To this end, the preformat signal includes information indicating a scanning state of the recording medium, an address indicating a physical location of storage areas of the recording medium, and the like. The address included in this preformat signal divides the storage area in the recording medium into a predetermined size and indicates the physical location of each of the divided storage areas. Accordingly, the recording medium recording apparatus must read the preformatted address and record data of a predetermined size specified by the preformatted address at a position designated by the preformatted address.

An optical disc, which is a kind of recording medium, is preformatted with an auxiliary signal including information indicating the scanning state of the optical disc and an address indicating the physical location of the storage areas. A variety of methods are used for preformatting the auxiliary signal depending on the type of optical disc. However, a wobbling preformat method capable of sufficiently maintaining the recording capacity of the optical disc has recently been in the spotlight. This wobbling preformat method preambles an auxiliary signal to the auxiliary pit by wobbling an auxiliary pit separate from a track on which user data is recorded according to a carrier signal of a predetermined period. To this end, the wobbling preformat method must modulate the auxiliary signal in order to load the auxiliary signal on the carrier signal. However, the conventional wobbling preformat method allocates a carrier signal of many cycles to the unit information of the auxiliary signal. For this reason, the conventional wobbling preformatting method cannot divide the track of the optical disc into unit recording sections within a certain length. This relatively long unit recording section reduces the recording density of the optical disc and slows down the random access speed. Furthermore, the auxiliary signal preformatted by the conventional wobbling preformatting method reduces the reliability at the time of recording / reproducing the optical disc. The above-described disadvantages of the conventional optical disc preformat method will be described in detail with reference to FIGS. 1 to 7.

Referring to FIG. 1, a CD preformatted with an auxiliary signal including information for tracking control, information for controlling the rotational speed of a disc, an address indicating a track on which the information is to be recorded, and an address indicating a physical position of the track. A recordable compact disc called -R is shown. In this compact disc, the auxiliary signal is preformatted on the track 12 of the normal valley, among the tracks 10 and 12 of the hill and groove. The auxiliary signal is preformatted on the track of the valley as the tracks 10 and 12 of the peak and valley are wobbled to a carrier signal of a constant period so that two adjacent edges maintain the same phase with respect to the track 12 of the valley.

The auxiliary signal of this wobbling method is preformatted on the optical disc by a preformatting device such as the second degree. In FIG. 2, the auxiliary signal preformatting apparatus includes first and second dividers 16 and 18 which commonly input clock signals of 44.1 KHz from the clock generator 14, and a second divider ( A frequency modulator 22 for inputting a carrier signal from 18 and a channel encoder 20 for inputting an auxiliary signal PFS from the input line 15. The first divider 16 divides the clock signal of 44.1 KHz from the clock generator 14 into seven to generate a dual phase clock PCLK of 6.3 KHz. The second divider 18 divides the clock signal of 44.1 KHz from the clock generator 14 into two to generate a carrier signal CIS of 22.05 KHz. The auxiliary signal PFS is composed of a synchronization signal SYNC for dividing tracks of the optical disc into frames and an identification code part PID indicating the physical position of the frames separated by the synchronization signal. The identification code unit PID includes an auxiliary address (not shown) indicating a physical position of a frame divided on a track of an optical disc and an error correction code (not shown) for error correction. The channel encoder 20 channel codes auxiliary frame data from the input line 15 to generate a channel bit stream (PCHB). The channel encoder 20 generates a dual phase signal DPS by performing dual phase modulation by the dual phase clock PCLK of 6.3 KHz from the first divider 16. The dual phase signal DPS is loaded on the carrier signal CIS by being frequency-modulated by the frequency modulator 22 which inputs the carrier signal CIS. The frequency modulated auxiliary signal (hereinafter referred to as carrier signal Pc) output from the frequency modulator 22 to the output line 17 is the same frequency band as the carrier signal generated in the second divider 18, that is, 22.05 KHz. It is distributed in the nearby frequency band. In accordance with this carrier signal Pc, both boundary sides adjacent to the tracks 10 and 12 of the hills and valleys shown in FIG. 1 are wobbled. The carrier signal Pc is restored and used by the optical disk recording apparatus when recording user information on the optical disk. Two bits of data in the channel bit stream (PCHB) are carried in a section corresponding to seven periods of the carrier signal (CIS). Accordingly, in order to preformat one-bit data to the wobbling pit (that is, the edge of the hill and the valley), a wobbling pit section corresponding to 3.5 cycles of the 3.5 cycle carrier signal is required.

Next, a conventional optical disk recording apparatus for recording user information on an optical disk on which an auxiliary signal is preformatted by a wobbling preformat method using frequency modulation will be described with reference to FIGS.

Referring to FIG. 4, a conventional optical disk recording apparatus includes an optical disk 24 installed to be rotated by a spindle motor 26, a servo unit 30 connected to an optical pickup 28, and a spindle motor ( The motor drive part 32 connected to 26 is provided. The optical pickup 28 irradiates one main light beam MB and two auxiliary light beams SB ₁ and SB ₂ to the track 12 of the valley of the optical disc 24 as shown in FIG. Information is recorded by MB, and the preformatted carrier signal is read by the auxiliary light beams SB ₁ and SB ₂ . To this end, the optical pickup 28 has a photodetector PD for detecting three light beams MB, SB ₁ , SB ₂ reflected by the optical disk 24. The servo unit 30 drives the actuator ACT in the optical pickup 28 based on the output signals of the photodetector PD to adjust the size of the light beams MB, SB ₁ and SB ₂ and the position on the track. do. On the other hand, the motor drive unit 32 adjusts the rotational speed of the spindle motor 26 in accordance with the signal from the servo unit 30.

The conventional optical disc recording apparatus includes a carrier signal detector 34 and an auxiliary signal decoder 36 connected in series to the photodetector PD of the optical pickup 28. The carrier signal detector 34 detects the carrier signal Pc preformatted on the track 12 of the valley of the optical disc 24 from the output signal of the photodetector PD. To this end, the carrier signal detector 34 performs the first band pass filter 46 for band filtering the first high frequency signal RFt ₁ and the second high frequency signal RFt _{2 as} shown in FIG. The second band pass filter 48 and the addition amplifier 50 which adds the output signals of both band pass filters 46 and 48 are comprised. The first high frequency signal RFt ₁ and the second high frequency signal RFt ₂ are obtained by converting the first auxiliary light beam SB ₁ and the second auxiliary light beam SB ₂ into an electrical signal by the photodetector PD. The adder amplifier 50 adds and amplifies the output signals of the first and second band pass filters 46 and 48 to detect the carrier signal Pc of a predetermined period.

The auxiliary signal decoder 36 then recovers the address signal PAdd indicating the physical position of the track 12 of the valley from the carrier signal Pc from the carrier signal detector 34. For this purpose, the auxiliary signal decoder 36 is composed of a dual phase clock regenerator 54, a synchronization detector 56 and a dual phase signal decoder 58 connected in parallel to the frequency demodulator 52 as shown in FIG. The frequency demodulator 52 frequency demodulates the recovered carrier signal Pc as shown in FIG. 7A from the add amplifier 50 shown in FIG. 5 to recover the dual phase modulated signal. The dual phase clock regenerator 54 restores the dual phase clock PCLK as shown in FIG. 7A from the dual phase modulated signal from the frequency demodulator 52, and synchronizes the restored dual phase clock PCLK. The detector 56 and the dual phase signal decoder 58 are supplied. In addition, the synchronization detector 56 separates the synchronization signal PYre as shown in FIG. 7A from the dual phase modulation signal by using the dual phase clock PCLK, and divides the synchronization signal PYre into the dual phase signal decoder 58. To feed. Then, the dual phase signal decoder 58 detects the identification code part PID from the dual phase modulated signal by the synchronization signal PYre, and includes the identification code part PID in the identification code part PID using the dual phase clock PCLK. The restored auxiliary address signal PAdd and the error correction code. The dual phase signal decoder 58 corrects an error generated at the auxiliary address PAdd restored by the restored error correction code, and generates an error signal indicating an error correction state. The restored auxiliary address signal PAdd is recorded on the track 12 of the valley of the optical disc 24 together with the user data as the identification code UID of the user information. The auxiliary address signal PAdd indicates the physical position of the frame section divided by the synchronization signal PYre and defines the unit data amount of the user information.

In addition, the conventional optical disc recording apparatus includes a reference signal generator 38 for generating a reference synchronization signal SYref and a reference clock SCLK, a recording information processor 40, and an optical pickup 28 as shown in FIG. 7B. Optical controller 42 connected between the laser diodes LD). The recording information processing unit 40 adds the auxiliary address signal PAdd from the auxiliary signal decoder 36 to the reference synchronization signal SYref from the reference signal generator 38 to form the identification code unit UID of the user data. In addition, the recording data is blocked into a user data block (UDB) of a constant size (i.e., frames separated by the auxiliary synchronization signal PYre). Then, the recording information processing unit 40 adds the user identification code unit UID in front of the user data block UDB to form the user data frame UDF as shown in FIG. 7B. The user data frame UDF is supplied to the laser diode LD through the optical controller 42 in accordance with the reference clock SCLK generated by the reference signal generator 38, thereby bending the optical disk bent by the carrier signal Pc ( The frame section on the track 12 of the valley of 24 is recorded as shown in FIG.

As described above, the auxiliary signal preformatted on the optical disc consumes a relatively long track section (i.e., 3.5 cycles of the carrier signal) per one bit of data, so that the track of the optical disc has a length within a certain limit. It could not be divided into unit recording intervals (ie, frames). As a result, the optical disc cannot record user data densely and slow down the random access speed of the optical disc drive. Furthermore, the auxiliary signal preformatted by the conventional wobbling preformatting method reduces the reliability at the time of recording / reproducing the optical disc.

Accordingly, an object of the present invention is to provide an optical disc preformatting method and apparatus capable of improving the recording density and random access performance of an optical disc.

Another object of the present invention is to provide a method and apparatus for reproducing an auxiliary signal preformatted on an optical disk by a phase modulation method.

Another object of the present invention is to provide an optical disc recording method and apparatus capable of densely and randomly recording user data on an optical disc.

In order to achieve the above object, the optical disc preformatting method according to the present invention pre-formats an auxiliary signal for specifying the unit recording capacity of data in at least one bit or more in one cycle of the carrier signal and preformats it on the optical disc.

The optical disc preformatting apparatus according to the present invention pre-formats an auxiliary signal for defining a unit recording capacity of data in at least one bit or more in one cycle of a carrier signal and preformats it on the optical disc.

An optical disc preformatting apparatus according to the present invention comprises an auxiliary structure comprising means for generating a carrier signal, a synchronization signal for dividing a track into unit recording sections, and an auxiliary address indicating the physical position of the unit recording sections separated by the synchronization signal. Phase modulating means for changing the phase of the carrier signal in accordance with the logic value of the signal.

The optical disc auxiliary signal reproducing method according to the present invention comprises a first step of reading a carrier signal from a preformatted optical disc with an auxiliary signal defining a unit recording capacity of data loaded on a carrier signal, and phase demodulating from the read carrier signal. And recovering the auxiliary signal.

An optical disc auxiliary signal reproducing apparatus according to the present invention is provided with a reading means for reading the carrier signal from an optical disk in which an auxiliary signal defining a unit recording capacity of data is loaded on a carrier signal, and from the carrier signal from the reading means. Phase demodulation means for recovering an auxiliary signal by performing phase demodulation.

In the optical disc recording method according to the present invention, an auxiliary signal consisting of a synchronization signal for dividing a track into unit recording sections and an auxiliary address indicating a physical position of the unit recording sections divided by the synchronization signal is carried on a carrier signal to carry the above-mentioned signal from the optical disc. A first step of detecting a carrier signal, a second step of recovering an auxiliary address by phase demodulating the detected carrier signal, and a third step of recording user data on the optical disc using the restored auxiliary address.

In the optical disc recording apparatus according to the present invention, an auxiliary signal comprising a synchronizing signal for dividing a track into unit recording sections and an auxiliary address indicating a physical position of the unit recording sections divided by the synchronizing signal is carried on a carrier signal to carry the carrier signal from the optical disc. Detecting means for detecting the signal, restoring means for phase demodulating the carrier signal detected by the detecting means, and restoring the auxiliary address; and recording means for recording the user data on the optical disc using the auxiliary address restored by the restoring means. Equipped.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 8, an auxiliary signal preformatting device according to an embodiment of the present invention for wobbling a boundary edge between adjacent peaks and valleys of an optical disc to preformat an auxiliary signal is shown. In FIG. 8, the auxiliary signal preformatting device includes a divider 62 and a channel encoder 64 connected in series with the oscillator 60. In FIG. The oscillator 60 generates a carrier signal CIS of a constant frequency (for example, 44.1 KHz) having a sine wave form. The divider 62 divides the carrier signal CIS from the oscillator 60 at a predetermined division ratio (for example, one division) and waveform-shapes it to generate a dual phase clock PCLK. Meanwhile, the channel encoder 64 inputs the dual phase clock PCLK from the divider 62 and the auxiliary signal PFS from the input line 61. This auxiliary signal is composed of a synchronization signal SYNC for dividing a track of an optical disc into a unit recording section (i.e., a frame) and an identification code portion (PID) indicating the physical position of the frames divided by this synchronization signal. The identification code unit PID includes an auxiliary address (not shown) indicating a physical position of a frame divided on a track of an optical disc and an error correction code (not shown) for error correction. The channel encoder 64 channel codes the auxiliary signal PFS to generate a channel bit stream PCHB. The channel encoder 64 generates a dual phase signal DPS by dual phase modulating the channel bit stream PCHB using the dual phase clock PCLK from the divider 62.

The auxiliary signal preformatting apparatus further includes a phase modulator 68 for inputting a carrier signal CIS from the oscillator 60 and a dual phase signal DPS from the channel encoder 64. The phase modulator 68 phase modulates the dual phase signal DSP using the carrier signal CIS to generate a carrier signal Pc. The carrier signal Pc has the same frequency as the carrier signal CIS as shown in FIG. 9, but has a phase delayed by 180 degrees according to the logic value of the dual phase signal. Accordingly, one bit data of the channel bit stream PCHB is loaded in one period of the carrier signal Pc. The carrier signal Pc generated in the phase modulator 66 is supplied to a formatter (not shown) via the output line 63. The formatter then preformats the auxiliary signal to the wobbling pit on the optical disc by wobbling both boundary edges of the mountain and valley tracks of the optical disc or one of the boundary edges according to the carrier signal Pc. This wobbling pit consumes a section corresponding to one period of the carrier signal Pc (that is, one period of the carrier signal CIS) to represent one bit of data of the channel bit stream PCHB. In addition, the phase-modulated auxiliary signal divides both the mountain and valley tracks of the optical disc or any one track into unit recording sections (i.e., frames) having a size of 1 / 3.5 as compared with the conventional frequency-modulated auxiliary signal. Accordingly, the phase modulated auxiliary signal can improve the recording density and random access performance of the optical disc. In addition, the phase-modulated auxiliary signal causes the optical disc drive device to record user data on the optical disc in a compact and random manner.

FIG. 10 shows an optical disc recording apparatus according to an embodiment of the present invention for recording user data on an optical disc having an auxiliary pit area that is wobbled according to a phase modulated carrier signal. 10, the optical disk recording apparatus includes an optical disk 24 installed to be rotated by the spindle motor 26, a servo unit 30 connected to the optical pickup 28, and a motor connected to the spindle motor 26. As shown in FIG. The drive part 32 is provided. The optical pickup 28 irradiates one main light beam MB and two auxiliary light beams SB ₁ and SB ₂ to the track 12 of the valley of the optical disc 24 as shown in FIG. The information is recorded by MB, and the auxiliary light beams SB ₁ and SB ₂ read the carrier signal Pc pre-formatted at the boundary between adjacent mountain and valley tracks. To this end, the optical pickup 28 is positioned between the laser diode LD and the photodetector PD to emit a laser light beam, and an object installed between the optical disc 24 and the beam splitter BS. A lens OL is provided. The objective lens OL condenses the laser light beam traveling from the beam splitter BS toward the optical disk 24. The beam splitter BS enables the laser light beam from the laser diode LD to be irradiated onto the surface of the optical disc 24 via the objective lens OL, and the reflected light beam reflected by the optical disc 24 is also detected by the sensor. Proceed toward the photodetector (PD) via a lens (SL). The sensor lens SL focuses the light beam traveling from the beam splitter BS toward the photodetector PD and adjusts the focus by astigmatism. The light beam generated by the laser diode LD is separated into three light beams MB, SB ₁ and SB ₂ by the diffraction grating GT. The light beams MB, SB ₁ and SB ₂ separated by the diffraction grating GT are formed by the objective lens OL via the beam splitter BS, as shown in FIG. It is focused to lie on top of the track 12. The light beams MB, SB ₁ and SB ₂ reflected by the track 12 of the valley of the optical disk 24 are photodetected by the sensor lens SL via the objective lens OL and the beam splitter BS. It collects on the surface of PD. The photodetector PD converts the auxiliary light beams SB ₁ and SB ₂ into electrical signals to generate first and second high frequency signals RFt ₁ and RFt ₂ . The servo unit 30 drives the actuator ACT in the optical pickup 28 by the first and second high frequency signals RFt ₁ and RFt ₂ from the photodetector PD to light beams MB, SB ₁ , and the like. Adjust the size of SB ₂ ) and the position on the track. On the other hand, the motor drive unit 32 adjusts the rotational speed of the spindle motor 26 in accordance with the signal from the servo unit 30.

The optical disc recording apparatus includes a carrier signal detector 34 and an auxiliary signal decoder 70 connected in series to the photodetector PD of the optical pickup 28. The carrier signal detector 34 processes the first and second high frequency signals RFt ₁ , RFt ₂ from the photodetector PD and pre-formatted the carrier signal Pc on the track 12 of the valley of the optical disc 24. ). To this end, the carrier signal detector 34 may be configured as shown in FIG. The carrier signal detected by the auxiliary detector 34 is a phase-modulated signal and contains a synchronization signal SYNC and an auxiliary identification code PID. The auxiliary signal decoder 70 is the physical position of the track 12 of the synchronous signal SYNC and the valley indicating the boundary of the unit recording section (that is, the frame) from the carrier signal Pc from the carrier signal detector 34. Restore the auxiliary address signal PAdd indicating. To this end, the adaptive auxiliary signal decoder 80 may be configured as shown in the eleventh degree, which will be described later.

The optical disc recording apparatus also includes a reference signal generator 38 for generating a reference synchronization signal SYref and a reference clock. An optical controller 42 is connected between the recording information processing unit 40 and the laser diode LD of the optical pickup 28. The recording information processing unit 40 generates a user identification code UID using the auxiliary address signal PAdd from the auxiliary signal decoder 70 and stores the recording data in a predetermined size (that is, the auxiliary synchronization signal PYre). Block is divided into user data blocks (UDBs). The record information processor 40 adds the user identification code UID and the user data block UDB to the reference synchronization signal from the reference signal generator 38 to form the user data frame UDF. The user data frame UDF is supplied to the light controller 42 in accordance with the reference clock generated by the reference signal generator 38. Then, the optical controller 42 interrupts the laser diode LD according to the logic value of the output signal from the recording information processing unit 40 so that the user data frame UDF is divided by the auxiliary synchronization signal PYre. It is recorded in a frame on the track 12 of the valley of the optical disc 24.

Finally, the optical disc recording apparatus further includes a control unit 44 connected in common to the servo unit 30, the motor drive unit 32, and the optical controller 42. The controller 44 controls whether the servo unit 30 and the motor driver 32 operate, and also controls the operation mode of the light controller 42. The controller 44 may input the auxiliary address PYre from the auxiliary signal decoder 70 and search for a position on the optical disc 24 to be accessed by the auxiliary address PYre. In addition, the controller 44 may track jump the optical pickup 28 toward the track 12 of another goal to be accessed.

FIG. 11 shows the auxiliary signal decoder 70 shown in FIG. 10 in detail. In FIG. 11, the auxiliary signal decoder 70 is commonly connected to a slicer 80 for inputting a carrier signal Pc detected from the carrier signal detector 34 of FIG. Integrator 82, dual phase clock regenerator 84, and phase decoder 86 are provided. The slicer 80 generates a pulse-shaped auxiliary carrier clock Pcp by level slicing the carrier signal Pc based on the integral signal from the integrator 82 and waveform shaping the level-sliced signal. The integrator 82 integrates the auxiliary carrier clock Pcp from the slicer 80 and supplies the integrated signal to the slicer 80 as a reference voltage. The dual phase clock regenerator 84 reproduces the dual phase clock PCLK from the subcarrier clock Pcp from the slicer 80 using a phase locked loop. To this end, the dual phase clock regenerator 84 may be configured as in the thirteenth degree, which will be described in detail later. The phase decoder 86 demodulates the dual phase signal DPS from the auxiliary carrier clock Pcp by using the dual phase clock PCLK from the dual phase clock regenerator 84. In detail, the phase decoder 86 restores the dual phase signal DPS by changing the output logic depending on whether the phase of the dual phase clock PCLK and the auxiliary carrier clock Pcp is equal to each other as shown in FIG. do.

In addition, the auxiliary signal decoder 70 commonly inputs the dual phase signal DPS from the inverter 88 and the phase decoder 86 which half-reduces the dual phase clock PCLK from the dual phase clock regenerator 84. A synchronization detector 90 and dual phase decoder 92 are further provided. The synchronization detector 90 detects the auxiliary synchronization signal PYre from the dual phase signal DSP by using the inverted dual phase clock PCLK from the inverter 88.

The dual phase signal decoder 92 recovers the channel bit stream PCHB from the dual phase signal DSP using the dual phase clock PCLK, and channel decodes the channel bit stream PCHB to provide the auxiliary signal PFS. ). The dual phase clock decoder 92 includes an auxiliary identification code section consisting of an auxiliary address signal PAdd and an error correction code EDC from the auxiliary signal PFS by the auxiliary synchronization signal PYre from the sync detector 90. PID) is detected. The dual phase signal decoder 92 corrects an error generated at the auxiliary address PAdd by the error correction code EDC and generates an error signal ES indicating an error correction state. The auxiliary address PAdd indicates the physical position of the frame by the auxiliary synchronization signal PYre and is supplied to the recording information processing unit 40 shown in FIG. The auxiliary synchronization signal PYre and the error signal ES are supplied to the controller 44 shown in FIG. 10 together with the auxiliary address signal PAdd as necessary.

FIG. 13 shows in detail the dual phase clock regenerator 84 shown in FIG. In FIG. 13, the dual phase clock generator 84 is a cyclic loop together with the phase comparator 100 for inputting the subcarrier clock Pcp from the slicer 80 shown in FIG. An integrator 102 and a Voltage Controlled Oscillator (hereinafter referred to as VCO) 104 are connected to form a VCO. The phase comparator 100 compares the phase of the oscillation signal DPCLK generated from the subcarrier clock Pcp and the VCO 104, and provides a specific logic (e.g., the phase difference) as shown in FIG. For example, the phase error signal Pe holding high logic) is detected. The integrator 102 then equalizes the phase error signal Pe from the phase detector 100 to remove the high frequency noise signal and supplies the leveled signal to the VCO 104. According to the output signal of the integrator 102, the VCO 104 generates an oscillation signal DPCLK having a frequency twice as high as the dual phase clock PCLK and supplies it to the phase comparator 100 and the divider 106. . Next, the divider 106 divides the oscillation signal from the VCO 104 into two to generate the dual phase clock PCLK. This dual phase clock PCLK is supplied to the phase decoder 86 and inverter 88 shown in FIG.

As described above, the optical disc preformatting apparatus according to the embodiment of the present invention is provided by dual phase modulating an auxiliary signal including a synchronization signal and an auxiliary address and changing a phase of a carrier signal according to a logic state of the dual phase modulated signal. One bit of an auxiliary signal may be loaded in one cycle of the carrier signal. Accordingly, the optical disc preformatting apparatus according to the embodiment of the present invention can divide the tracks of the peaks and valleys of the optical disc into small unit recording sections. Furthermore, the optical disk preformatting apparatus according to the embodiment of the present invention can improve the recording density and random access characteristics of the optical disk as well as increase the reliability. The optical disc recording apparatus according to the embodiment of the present invention can also densely record the user data optical disc by demodulating the auxiliary signal modulated from the optical disc, and at the same time improve the random access characteristics and reliability.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. For example, it will be understood by those skilled in the art that two-bit auxiliary signals can be loaded in one cycle of the carrier signal when the quadrature phase modulation of the dual phase modulated auxiliary signal is not performed by the dual phase modulation method. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (18)

An optical disc preformat method, characterized in that an auxiliary signal for defining a unit recording capacity of data is carried out at least one bit or more in one cycle of a carrier signal and preformatted on an optical disc. The method of claim 1, And the carrier signal is changed in phase according to a logic value of an auxiliary signal. The method of claim 2, And the carrier signal has two phases according to a logic value of an auxiliary signal. The method of claim 2, And the carrier signal has four phases according to a logic value of an auxiliary signal. The method of claim 1, And the carrier signal is generated by the auxiliary signal being dual phase modulated by a dual phase clock and the dual phase modulated auxiliary signal being phase modulated. An optical disc preformatting apparatus, characterized in that an auxiliary signal for specifying a unit recording capacity of data is loaded at least one bit or more in one cycle of a carrier signal and preformatted on an optical disc. The method of claim 6, And the carrier signal is changed in phase according to a logic value of an auxiliary signal. The method of claim 7, wherein And said carrier signal has two phases according to a logic value of an auxiliary signal. The method of claim 7, wherein And the carrier signal has four phases according to a logic value of an auxiliary signal. An optical disc preformatting apparatus for preformatting an optical disc by carrying an auxiliary signal comprising a synchronization signal for dividing a track of an optical disc into unit recording sections and an auxiliary address indicating a physical position of the unit recording sections separated by the synchronization signal on a carrier signal. To Carrier generating means for generating a carrier signal, And a phase modulating means for changing a phase of the carrier signal in accordance with a logic value of the auxiliary signal. The method of claim 10, Clock generating means for generating a dual phase clock; And a digital modulating means for modulating the auxiliary signal by the dual phase clock and supplying the modulated signal to the phase modulating means. The method of claim 11, And the digital modulating means channel-codes the auxiliary signal before dual phase modulation. A first step of reading a carrier signal from a preformatted optical disc by carrying an auxiliary signal defining a unit recording capacity of data on a carrier signal; And a second step of recovering an auxiliary signal by performing phase demodulation from the read carrier signal. The method of claim 13, Reproducing a dual phase clock from the phase demodulated signal; And a fourth step of performing dual phase decoding on the phase demodulated auxiliary signal using the dual phase clock. Reading means for reading the carrier signal from a preformatted optical disc with an auxiliary signal defining a unit recording capacity of data loaded on the carrier signal; And a phase demodulation means for reconstructing an auxiliary signal by phase demodulating from said carrier signal from said reading means. The method of claim 15, Dual phase clock reproducing means for reproducing a dual phase clock from the phase demodulated signal; And dual phase decoding means for dual phase decoding the auxiliary signal demodulated by the dual phase clock. A first step of detecting a carrier signal from an optical disc by carrying a carrier signal on a carrier signal comprising a synchronization signal for dividing a track into unit recording sections and an auxiliary address indicating a physical position of the unit recording sections separated by the synchronization signal; Wow, Phase demodulating the carrier signal to recover an auxiliary address; And a third step of recording user data on the optical disc by using the auxiliary address. An auxiliary signal consisting of a synchronization signal for dividing a track into unit recording sections and an auxiliary address indicating the physical position of the unit recording sections separated by the synchronization signal is loaded on a carrier signal to detect the carrier signal from an optical disc. Sudan, Restoring means for phase demodulating the carrier signal detected by the auxiliary signal detecting means to restore the auxiliary address; And recording means for recording the user data on the optical disk by using the auxiliary address restored by the recovery means.