KR20020081760A - Optical recording medium wobble signal recorded thereon, wobble signal recording apparatus and recording method thereof - Google Patents

Abstract

PURPOSE: An optical recording medium recorded with a wobble signal, a device and a method for recording the wobble signal are provided to easily extract header information with obtaining a stable clock signal. CONSTITUTION: In an optical recording medium recorded with a wobble signal carrying header information, a period of the wobble signal is a multiple of a unit period of a recording mark. A method for recording the wobble signal carrying header information at the optical recording medium includes the steps of preparing sine waves, each having a period which is a multiple of the unit period of the recording mark to record user data at an information track and is different from others; modulating the header information shown by binary data based on the sine waves; recording the obtained wobble signal.

Description

Optical recording medium recording wobble signal, wobble signal recording apparatus and recording method thereof

The present invention relates to an optical recording medium, and more particularly, to an optical recording medium having an information track on which a wobble signal is recorded, a wobble signal recording method, and a wobble signal recording apparatus.

In a recordable optical disc such as a DVD-RAM (Digital Versatile Disc-RAM), concentric or spiral information tracks (groove tracks / land tracks) are formed. In the information track, a wobble signal is recorded using a change in the amplitude direction. The wobble signal is one of means for recording an auxiliary clock signal for obtaining synchronization information during recording / reproducing. The wobble signal has a frequency of a band which does not affect the tracking servo mechanism provided in the recording / reproducing apparatus, and is used as an auxiliary clock signal to assist the system clock during recording / reproducing. The DVD Specifications for Rewritable Disc Version 2.0 stipulate that the servo band for radial tracking is about 10 kHz, and the frequency of the wobble signal is about 157 kHz at the standard line speed.

User data is recorded in the information track by the laser beam oscillated from the pickup apparatus. That is, the pickup apparatus must be able to move to a desired position on the information track in order to record or reproduce user data. For this purpose, addressing information is recorded on the optical disc. Here, the "addressing information" means "identification information given to each sector when the information track is divided into a plurality of sectors." The addressing information belongs to the header information.

There are two methods of recording header information on a conventional optical disk. The first method is to prepare a header area separately from the information track on which user data is recorded and to record the header information therein.

1 is a schematic diagram of a conventional optical disk.

1, an information track (land track and / or groove track) which is a user data area is formed in an optical disc, and a header area 1 in which header information is recorded pre-pit is provided. The header area is arranged in a predetermined area of the sector, and the pickup device provided in the recording / reproducing device can easily move to a desired position through the addressing information recorded in the header area. Furthermore, the sector number, sector type, information track, and the like can be recognized, and servo control can also be performed.

However, providing a separate header area not only complicates the optical disc manufacturing process but also requires additional circuitry to compensate for the wobble signal being not obtained properly while the pickup device passes through the header area.

The second method is a method of loading header information in the above-described wobble signal instead of providing a separate header area as shown in FIG. According to this, the wobble signal in which the header information is frequency shift keyed (FSK) is recorded in the information track. The pick-up apparatus can read the wobble signal and find out header information, that is, addressing information. However, since the header information is not a pure wobble signal of a single frequency, a separate phase locked loop (PLL) circuit is required to extract both the addressing information and the clock signal from the wobble signal whose frequency changes. In addition, since the frequency of the wobble signal is not fixed but changes, it is not easy to generate a stable clock signal therefrom.

Accordingly, an object of the present invention is to provide an optical recording medium on which a wobble signal is recorded, capable of extracting header information and obtaining a stable clock signal, a wobble signal recording method, a wobble signal recording apparatus, a wobble signal reproducing method, and a wobble. It is to provide a signal reproducing apparatus.

Another object of the present invention is an optical recording medium having a wobble signal recorded therein, which can easily extract header information and obtain a stable clock signal, a wobble signal recording method, a wobble signal recording apparatus, a wobble signal reproducing method, and a wobble signal. It is to provide a playback device.

1 is a schematic diagram of a conventional optical disk,

2 is a schematic diagram of an optical disk according to a preferred embodiment of the present invention;

3 is an example of an information track on which a wobble signal is recorded according to a preferred embodiment of the present invention;

4 is a reference diagram for explaining a relationship between a wobble signal and a recording mark of FIG. 3;

5 is , , , , A reference diagram showing a process of generating a wobble signal at

6 is a block diagram of a wobble signal recording apparatus according to a preferred embodiment of the present invention;

7 is an example of the wobble signal recording apparatus of FIG. 6;

8 is a block diagram for explaining the modulation scheme of the modulator 622 of FIG.

9 is a flowchart for explaining a wobble signal recording method according to a preferred embodiment of the present invention;

10 is an example of a wobble signal recorded by the wobble signal recording apparatus according to the present invention;

11 is a block diagram of a wobble signal reproducing apparatus according to an embodiment of the present invention;

12 is a schematic diagram of signals output from respective stages of the component circuit of the wobble signal reproducing apparatus of FIG. 11;

13 is a block diagram of a wobble signal reproducing apparatus according to another embodiment of the present invention;

14 is a schematic diagram of signals output from respective stages of the component circuit of the wobble signal reproducing apparatus of FIG.

According to the present invention, an optical recording medium on which a wobble signal carrying header information is recorded, wherein the period of the wobble signal is a multiple of a unit period of a recording mark.

The wobble signal is a continuous signal, and the header information is modulated on the basis of sine waves each having a different multiple with respect to a unit period of the recording mark.

In the modulation, when the header information is represented as binary data, a high level is obtained by repeating one period waveform of the sine wave more than or equal to the least common multiple of integers obtained by dividing the multiples by the unit period. Corresponding to the signal,

When the header information is displayed as binary data, the low level preferably corresponds to a signal in which one cycle of the remaining sinusoidal wave is repeated more than or equal to the least common multiple of integers obtained by dividing the multiples by the unit period. Do.

The above object is also a wobble signal carrying header information. An optical recording medium having an information track recorded thereon, wherein the wobble signal Is also achieved by the optical recording medium characterized by the following formulas (1) to (5).

(One)

(2)

(3)

(4)

(5) , ,

here, Is any non-zero real number, , , , Are each any natural number, Is Represents the maximum integer not exceeding the number inside. ( Is an integer) is binary data represented by 0 or 1, Is the unit length of the record mark, Means the least common multiple.

The above object is also provided in an optical recording medium having an information track on which a wobble signal containing header information is recorded, wherein the wobble signal is a unit cycle of a recording mark for recording the user data on the information track. And modulated based on a first sinusoidal wave having a second sinusoidal wave having a period twice the unit period,

In the modulation, when the header information is represented as binary data, the high level corresponds to a signal in which one period waveform of one of the first and second sinusoids is repeated at least twice, and the header information is represented as binary data. When displayed, the low level is also achieved by the optical record carrier, characterized in that the one periodic waveform of the other of the first and second sinusoids corresponds to a signal repeated at least twice.

According to another aspect of the present invention, the above object is a method of recording a wobble signal carrying header information on an optical recording medium, comprising: (a) a unit cycle of a recording mark for recording user data on the information track; Providing sinusoids each having different multiples in a cycle; (b) modulating the header information represented by binary data based on the sinusoids; And (c) recording the obtained wobble signal.

In step (b), frequency shift modulation is performed so that a continuous signal is generated.

(b1) the high level of the header information represented by the binary data corresponds to a signal in which one period waveform of the sine wave is repeated more than or equal to the least common multiple of integers obtained when the multiples are divided by the unit period. ,

The low level of the header information represented by the binary data corresponds to a signal in which one cycle of the remaining sinusoidal wave is repeated more than or equal to the number of times the least common multiple of integers obtained by dividing the multiples by the unit period.

Frequency-shift keying (FSK) the header information; And (b2) recording the wobble signal obtained by the frequency shift modulation.

In addition, the above object is a method of recording a wobble signal carrying header information on an optical recording medium, comprising: (a) a first sinusoidal wave having the unit cycle of a recording mark for recording user data on the information track; Providing a second sinusoid having a cycle twice the period; (b) a high level of the header information represented by binary data corresponds to a signal in which one period waveform of one of the first sinusoidal wave and the second sinusoidal wave is repeated at least twice, and the low level of the header information represented by binary data Modulating the remaining one periodic waveform of the first sinusoidal wave and the second sinusoidal wave corresponds to a signal repeated at least twice; And (c) recording the obtained wobble signal.

On the other hand, according to another field of the present invention, the above object is a recording apparatus for recording a wobble signal carrying header information on an optical recording medium, wherein a multiple of a unit period of a recording mark for recording user data on the information track is determined. A carrier signal generator for generating different sinusoids having a period; Using the sinusoids generated by the carrier signal generator, the high level of the header information represented by binary data is greater than the least common multiple of integers obtained by dividing the one cycle waveform of the one sinusoid by the multiples of the unit period. Or a low level of the header information represented by binary data, the number of times being equal to or greater than the least common multiple of integers obtained by dividing one period waveform of the remaining one sinusoid by the multiples of the unit period. A wobble signal generation unit configured to generate a wobble signal by modulating the header information so as to correspond to the repeated signal; And a recording unit for recording the wobble signal generated by the wobble signal generation unit.

In addition, the object is a wobble signal recording apparatus for recording a wobble signal carrying header information on an optical recording medium, comprising: a first sine wave having the unit period of a recording mark for recording user data on the information track, and the unit; A carrier signal generator configured to generate a second sinusoidal wave having a period twice the period; The high level of the header information represented by binary data corresponds to a signal in which one period waveform of one of the first sinusoidal wave and the second sinusoidal wave is repeated at least twice, and the low level of the header information represented by binary data corresponds to the second level. A wobble signal generation unit configured to generate a wobble signal by modulating the header information such that the remaining one periodic waveform of the first sinusoidal wave and the second sinusoidal wave corresponds to a signal repeated at least twice; And a recording unit for recording the wobble signal obtained from the wobble signal generation unit.

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

2 is a schematic diagram of an optical disk according to a preferred embodiment of the present invention.

Referring to Fig. 2, the optical disk according to the present embodiment is a recordable disk, in which information tracks of concentric circles (a) or spirals (b) are formed for recording user data. The information track includes a groove track and / or a land track. The information track is divided into a plurality of sectors and managed. A wobble signal carrying header information (or addressing information) is recorded in the information track included in each sector.

3 is an example of an information track on which a wobble signal is recorded according to a preferred embodiment of the present invention.

As shown in FIG. 3, the wobble signal is formed by adding a certain amount of offset to the left and right sides of the laser beam when forming a groove track using the laser beam during a mastering process of manufacturing a substrate of the optical disk. Record the change in shape on both sides of the groove track. The wobble signal according to the present invention is generated by modulating the header information represented by the digital bitstream into an analog signal. Here, the header information (or addressing information) may be represented as a bitstream encoded by a predetermined encoding scheme. In the present embodiment, it is represented as Bi-Phase Data according to Bi-Phase encoding. "0" and "1" of the encoded bitstream are again frequency shift keyed (FSK). Carrier signals used for frequency shift modulation are sinusoids having different frequencies. However, as shown, it can be seen that the wobble signal according to the present invention does not have a discontinuity even when the frequency shift is modulated by the digital bitstream "01" or "10" into an analog signal. The wobble signal shown in FIG. 3 is a case where the frequency of the sine wave corresponding to "1" is twice the frequency of the sine wave corresponding to "0". On the other hand, the wobble signal can be recorded by giving a shape change to only one wall surface of the groove track, unlike that shown in FIG.

4 is a reference diagram for explaining a relationship between a wobble signal and a recording mark of FIG. 3.

Referring to Fig. 4, a recording mark 4 used for recording user data on an information track is indicated. The recording mark 4 displayed on the first information track has an arrangement type and an interval between 3T, 3T, 3T, 3T, 4T, 4T, 4T, 4T, and 5T when the unit cycle is T. On the other hand, the wobble signal is represented by a sinusoidal wave having a period of 20T. That is, in the wobble signal according to the present invention, the frequency shift is modulated by using the first sinusoidal wave and the second sinusoidal wave whose header information has different frequencies, and the frequencies of the first sinusoidal wave and the second sinusoidal wave are recorded in the recording mark 4, respectively. Is divided by the unit period T of.

Wobble signal according to the present invention If is expressed as general formula, it is as follows.

(One)

(2)

(3)

(4)

(5) , ,

here, Is any non-zero real number, , , , Are each any natural number, Is Represents the maximum integer not exceeding the number inside. ( Is an integer) is input binary data (Bi-Phase Data) represented by 0 or 1, Is the unit length of the record mark, Means the least common multiple.

Referring to equations (1) to (5), the wobble signal It can be seen that is represented by the first sinusoidal wave and the second sinusoidal wave having a different frequency. silver Is 1, the frequency component of the first sinusoidal wave used, Is The frequency component of the second sinusoidal wave used when 0 is zero. Furthermore, Is , Since the least common multiple of, the first and second sinusoids With ingredients You will have the ingredients at the same time. Therefore, the frequencies of the first sinusoidal wave and the second sinusoidal wave Wobble signal at the point of dividing by an integer multiple of Will always have a value of zero. Accordingly, even when the first sinusoidal wave is converted from the second sinusoidal wave (or the second sinusoidal wave to the first sinusoidal wave), the discontinuity point does not exist.

Meanwhile, Is a natural number that represents the circumferential waveform of the first or second sinusoidal wave. By repeating it once, the envelope signal for the wobble signal is made to have a moderately long period. Since the envelope signal of the wobble signal has a moderately long period, the clock signal generated on the basis of the wobble signal has a moderately long period, thereby maintaining an optimal correlation with the servo control frequency and other signals used in the optical disk. Can be.

5 is , , , , It is a reference diagram showing a process of generating a wobble signal at.

Referring to FIG. 5, the input bi-phase data is [0101], and frequency shift modulation (FSK) obtained by using the first sinusoid and the second sinusoid when the bi-phase data is "1" and "0", respectively. ) Signals are shown respectively. Here, the horizontal axis showing each signal represents the time axis and the vertical axis represents the magnitude of the signal. When input bi-phase data is "1" Because of Thus, the period of the first sinusoidal wave is 0.3. When bi-phase data is "0" Because of Thus, the period of the second sinusoidal wave is 0.5. At the bottom is shown a wobble signal obtained by frequency shifting modulation of the bi-phase data using a first sinusoidal wave and a second sinusoidal wave. Although the illustrated wobble signal alternately displays 0 and 1, it can be seen that there is no discontinuity point. Here, the period of the wobble signal is , Since it is defined as 60T. In fact, in order for the first and second sinusoids to be alternated in a continuous manner, and LCM of If 15T is enough, 15T is repeated four times in this example. In other words, By allocating 4 to the value, this is to minimize the correlation between the wobble signal and the servo control signal. Meanwhile, Value and The value can be changed as necessary.

A method of generating a wobble signal carrying address information as header information based on the recordable DVD will be described in more detail as follows. Assuming that addressing information for 64 KB of user data is prepared, the channel bits after EFM + (Eight to Fourteen Plus) modulation are as shown in Equation (6). Here, EFM + is a data modulation method employed in DVD, and by converting 8-bit original data into 16-bit recording data, an improvement in recording density of about 7% can be obtained compared to EFM (Eight to Fourteen) modulation employed in CD. .

(6) 1488 channel bits × 26 × 32 = 1,238,016 channel bits

If the addressing information is recorded four times, the addressing information before bi-phase encoding is

<Sink> + 4 byte address + 2 byte parity

After bi-phase encoding, the addressing information is

12 bits + 64 bits + 32 bits = 108 bits

Therefore, the total number of bits obtained by repeatedly recording the addressing information four times is shown in Equation (7).

(7) 108 × 4 = 432 bits

In addition, the repetition frequency D of one cycle waveform of the wobble signal for expressing the period of the wobble signal and one bit of the bi-phase encoded addressing information is determined as follows.

The total number of bits (after modulation) of user data that can be recorded in the basic unit (sector in this embodiment) in which the addressing information is generated is called "A channel bit", and the total number of bits of addressing information (after modulation) is "B". Channel bit &quot;, the channel clock usable for one bit of the addressing information is shown in Equation (8).

(8) [A / (B × number of repetitions of one cycle of wobble signal D)] = period C of wobble signal

Where [] is the operation to find the maximum integer less than or equal to the number in [].

The repetition frequency D of the one-cycle waveform of the wobble signal is obtained by substituting the larger value of ω ₁ and ω ₂ in equations (1) to (5) by C in equation (8). For example, if ω ₁ = 2 ω ₂ and the circumferential waveform of the sinusoid of ω ₂ is repeated 32 times to display "0", Equation (8)

(9) [1,238,016 / (432 × 32)] = 89

Is obtained. Therefore, when the period of the sine wave of ω ₂ is 89T, the period of the sine wave of ω ₁ is 178T, and the circumference of the sine wave of ω ₁ can be repeated 16 times to display "1".

That is, the wobble signal according to an embodiment of the present invention displays the "1" of the addressing information by repeating the one cycle waveform of the sinusoid wave having the period of 178T 16 times, and the one cycle waveform of the sinusoid wave having the period of 89T is 32. It is obtained by frequency shift modulation repeatedly displaying "0" repeatedly. Furthermore, the decoding of the addressing information from the wobble signal thus obtained becomes possible.

On the other hand, the channel bits remaining after displaying the addressing information are obtained as follows.

(9) 1,238,016 channel bits-178 × 432 × 16 = 7,680 channel bits

Therefore, the remaining channel bits include a variable frequency oscillator (VFO) area for header information other than addressing information, for example, a phase locked loop (PLL) for a wobble signal, and a data linking area required for recording user data. Can be used as At this time, the information of the VFO area may be recorded using the minimum period of the wobble signal. In addition, conditions such as equation (10) can be set for the data linking region.

(10) (A + α) / minimum period of wobble signal = n, where n is a natural number

Substituting the appropriate number in equation (10) yields (7,680 + α) / 89 = natural number and the minimum α that satisfies this is 63. If α is 63, the one-period waveform of the wobble signal having the minimum period, which is assignable to the VFO area and the data linking area, is repeated (7,680 + 63) / 89 = 87 times.

6 is a block diagram of a wobble signal recording apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 6, the wobble signal recording apparatus is for recording a wobble signal carrying addressing information on an optical disc 600. The wobble signal recording apparatus includes a carrier signal generator 61, a wobble signal generator 62, and a recorder 63. Include.

The carrier signal generator 61 generates first and second sinusoids having different frequencies multiples of the recording periods of the unit period T at frequencies ω _{1 and} ω _{2 ,} respectively. The wobble signal generator 62 frequency shift modulates the address information using the first and second sinusoids generated by the carrier signal generator 61 to perform a wobble signal. Create Wobble signal The generation process of has been described above. The recording unit 63 records the wobble signal generated from the wobble signal generation unit 62 on the optical disc 600.

FIG. 7 is an example of the wobble signal recording apparatus of FIG. 6.

Referring to FIG. 7, the wobble signal recording apparatus includes a sine wave oscillator 610, a first clock divider circuit 611, and a second clock divider circuit 612 as a carrier signal generator 61. The sinusoidal oscillator 610 oscillates a sinusoidal wave having a predetermined frequency. In fact, the oscillation frequency of the sinusoidal oscillator 610 is significantly smaller than the frequencies of the first sinusoidal wave and the second sinusoidal wave described above. In this embodiment, the oscillation frequency is 26.16 MHz. However, the oscillation frequency of the sine wave oscillator 610 may be variously changed.

The first clock division circuit 611 counts the period of the sinusoidal wave input from the sinusoidal oscillator 610 to generate the first sinusoidal wave and the second sinusoidal wave as carrier signals. The second clock division circuit 612 also supplies the clock signal necessary for the encoding unit 621 in the same manner.

The encoder 621 included in the wobble signal generator 62 bi-phase encodes the addressing information based on the clock signal input from the second clock division circuit 612. Here, the encoding method of the encoding unit 621 may be changed as necessary. The modulator 622 modulates the wobble signal according to the present invention by frequency shifting the bi-phase data from the encoder 621 based on the first sinusoidal wave and the second sinusoidal wave input from the first clock division circuit 611. Create The recording unit 63 records the wobble signal obtained through the frequency shift modulation on the optical disk 700.

FIG. 8 is a block diagram for explaining the modulation method of the modulator 622 of FIG. 7 more clearly.

Referring to FIG. 8, the modulator 622 may convert the first sinusoid and the second sinusoid from the first clock division circuit 611 based on bi-phase data (encoded addressing information) from the encoder 621. By selectively receiving the signal, a wobble signal containing frequency-modulated addressing information is generated.

The wobble signal recording method according to the present invention according to the configuration as described above is as follows.

9 is a flowchart for explaining a wobble signal recording method according to a preferred embodiment of the present invention.

9, the carrier signal generator 61 of the wobble signal recording apparatus generates a first sinusoidal wave and a second sinusoidal wave (step 901).

The encoding unit 621 of the wobble signal generation unit 62 encodes the addressing information (step 902). In this embodiment, bi-phase encoded addressing information, that is, bi-phase data, is generated by bi-phase encoding.

The modulator 622 of the wobble signal generator 62 performs frequency shift modulation on the bi-phase data encoded and displayed in the bitstream using the first sinusoid and the second sinusoid (step 903).

The recording unit 63 records the wobble signal generated by the wobble signal generation unit 62 on the optical disc 600 (step 904).

10 is an example of a wobble signal recorded by the wobble signal recording apparatus according to the present invention.

The wobble signal shown in FIG. 10 is obtained by bi-phase encoding the addressing information and then performing frequency shift modulation to conform to Equations (1) to (5). As shown in FIG. 10, "1" of bi-phase data is displayed by repeating one cycle of the first sinusoidal wave having a period of 178T 16 times and "0" represents one of the second sinusoidal wave having a period of 89T. The periodic waveform is displayed repeatedly 32 times. Meanwhile, as described above, in addition to the addressing information, the VFO area and the user data link area may be recorded.

FIG. 11 is a block diagram of a wobble signal reproducing apparatus according to an embodiment of the present invention for reading addressing information by reading a wobble signal from an optical disc on which a wobble signal is recorded, and FIG. 12 is a wobble of FIG. It is a schematic diagram of signals output from each stage of the component circuit of the signal reproducing apparatus.

Referring to FIG. 11, the wobble signal reproducing apparatus includes an optical pickup unit 11, a recording clock signal generation unit 12, and an addressing information detection unit 13.

The optical pickup unit 11 detects the difference signal by the difference signal detector 110 and generates a wobble signal WBO as shown in FIG. 12 based on the detected difference signal.

The recording clock signal generation unit 12 receives the wobble signal WBO from the optical pickup unit 11 and passes the wobble signal WBO to the low pass filter 112, and then recovers the binary signal using the binarization circuit 113 and restores the binary signal. On the basis of this, the PLL unit 114 generates a write clock signal (Write Clock). The recording clock signal is a clock signal for recording user data on the information track, and its period is the recording mark unit period T. The clock signal in this embodiment has a frequency of 26.16 MHz.

The addressing information detection unit 13 receives the wobble signal WBO from the optical pickup unit 11 and extracts the addressing information and the data clock signal, and the low pass filter 111 and the peak-bottom for this purpose. The holder 115, the differential amplifier 116, the binarization circuit 117, the PLL unit 118, the synchronization circuit 119, and the decoder 120 are provided. The low pass filter 111 receives the wobble signal WBO and outputs a signal LPF 10 as shown in FIG. 12. At this time, the cut-off frequency of the low pass filter 111 is adjusted to the frequency of the first sinusoidal wave having a period of 178T. The peak-bottom holder 115 outputs the envelope signals PKenv and BTenv as shown in FIG. 12, respectively, which are obtained by taking the peak-hold / bottom-hold of the signal LPF 10 input from the low pass filter 111. The differential amplifier 116 receives the envelope signals PKenv and BTenv and outputs the signal WBENV as shown in FIG. 12, which is differentially amplified, and the binarization circuit 117 binarizes the differential amplification signal WBENV, as shown in FIG. Output the binary signal WBSLO as shown. Next, the PLL unit 118 receives the binary signal WBSLO and outputs a bi-phase clock signal as shown in FIG. 12, while the synchronization circuit 119 synchronizes the binary signal WBSLO and the bi-phase clock signal. . In this embodiment, the synchronization circuit 119 is implemented as a D-flip-flop. The bi-phase decoder 120 receives and decodes the bi-phase data and the bi-phase clock signal as shown in FIG. 12 and outputs the addressing information and the data clock signal as shown in FIG. The data clock signal is a clock signal for decoding the wobble signal and has an integer multiple of the above-described recording clock signal period T.

13 is a block diagram of a wobble signal reproducing apparatus according to another embodiment of the present invention, and FIG. 14 is a schematic diagram of signals output from respective stages of the component circuit of the wobble signal reproducing apparatus of FIG.

Referring to FIG. 13, the wobble signal reproducing apparatus includes an optical pickup unit 14, a recording clock signal generator 15, and an addressing information detector 16.

The optical pickup unit 14 detects the difference signal by the difference signal detector 130 and generates a wobble signal WBO as shown in FIG. 14 based on the detected difference signal.

The recording clock signal generation unit 15 receives the wobble signal WBO from the optical pickup unit 14 and passes it through the low pass filter 132 to obtain the signal LPF 20 as shown in FIG. Is recovered to the binary signal RWBSLO as shown in FIG. Next, the PLL unit 134 is used to generate a write clock signal based on the restored binary signal RWBSLO. The recording clock signal is a clock signal for recording user data on the information track, and its period is the recording mark unit period T.

The addressing information detector 16 receives the binary signal RWBSLO from the binarization circuit 133 and extracts addressing information (Address Data) and a data clock signal (Data Clock). For this, the edge detector 131, the counter 133, Data / clock reproducing circuit 134 and decoder 135. The edge detector 131 detects the edge of the binary signal RWBSLO, outputs the edge detection signal Wedge as shown in FIG. 14, and the counter 133 counts the period of the binary signal RWBSLO, as shown in FIG. 14. Output the same counting value Wcnt. As shown in FIG. 14, the data / clock regeneration circuit 134 shows &quot; 1 &quot; when the average value of the predetermined period (178T x 16 or 89T x 32) with respect to the counting value Wcnt is 178T at +/-. Outputs &quot; 0 &quot; Here, ε indicates an error (noise), so the magnitude of the value is preferably determined experimentally. The decoder 135 decodes the bi-phase data and the bi-phase clock signal, respectively, and outputs addressing information and a data clock. The data clock signal is a clock signal for decoding the wobble signal and has an integer multiple of the above-described recording clock signal period T.

As described above, according to the present invention, there is provided an optical recording medium on which a wobble signal is recorded which can easily extract header information and obtain a stable clock signal, a wobble signal recording method, and a wobble signal recording apparatus.

Claims (22)

An optical recording medium having a wobble signal including header information recorded thereon, And a period of the wobble signal is a multiple of a unit period of a recording mark. The method of claim 1, And the wobble signal is a continuous signal. The method according to claim 1 or 2, And the header information is modulated based on sine waves each having a different multiple of a unit cycle of the recording mark. The method of claim 3, In the modulation of the header information, when the header information is represented as binary data, the high level is one or more times the same common waveform of the sine wave than the least common multiple of integers obtained by dividing the multiples by the unit period. Corresponding to a signal obtained repeatedly, When the header information is displayed as binary data, the low level corresponds to a signal in which one cycle of the remaining sinusoidal wave is repeated more than or equal to the least common multiple of integers obtained by dividing the multiples by the unit period. Optical recording medium. The method of claim 4, wherein The header information is bi-phase encoded bi-phase data. The method according to claim 4 or 5, The header information is provided so as to correspond to each of a plurality of sectors, and is repeatedly loaded a plurality of times on a wobble signal recorded in an information track included in a corresponding sector. Wobble signal with header information An optical recording medium having an information track recorded thereon, The wobble signal Is represented by the following formulas (1) to (5). (One) (2) (3) (4) (5) , , here, Is any non-zero real number, , , , Are each any natural number, Is Represents the maximum integer not exceeding the number inside. ( Is an integer) is binary data represented by 0 or 1, Is the unit length of the record mark, Means the least common multiple. The method of claim 7, wherein And wherein the header information is bi-phase encoded bi-phase data. The method of claim 7, wherein The header information is provided so as to correspond to each of a plurality of sectors, and is repeatedly loaded a plurality of times on a wobble signal recorded on an information track included in a corresponding sector. An optical recording medium having an information track in which a wobble signal carrying header information is recorded, The wobble signal is modulated based on a first sinusoidal wave having a unit cycle of a recording mark for recording user data on the information track and a second sinusoidal wave having a double multiple of the unit cycle. In the modulation, when the header information is represented as binary data, the high level corresponds to a signal in which one period waveform of any one of the first and second sinusoids is repeated at least twice, And when the header information is displayed as binary data, the low level corresponds to a signal in which one cycle of the other one of the first and second sinusoids is repeated at least twice. The method of claim 10, The header information is bi-phase encoded bi-phase data. The method according to claim 10 or 11, wherein The header information is provided so as to correspond to each of a plurality of sectors, and is repeatedly loaded a plurality of times on a wobble signal recorded on an information track included in a corresponding sector. A method of recording a wobble signal carrying header information on an optical recording medium, (a) providing sine waves each having different multiples of a unit cycle of a recording mark for recording user data in the information track; (b) modulating the header information represented by binary data based on the sinusoids; And (c) recording the obtained wobble signal. The method of claim 13, In step (b), A wobble signal recording method according to claim 1, wherein frequency shifting modulation is performed to generate a continuous signal. The method of claim 14, In step (b), (b1) the high level of the header information represented by the binary data corresponds to a signal in which one period waveform of the sine wave is repeated more than or equal to the least common multiple of integers obtained when the multiples are divided by the unit period. , The low level of the header information represented by the binary data corresponds to a signal in which one cycle of the remaining sinusoidal wave is repeated more than or equal to the number of times the least common multiple of integers obtained by dividing the multiples by the unit period. Frequency-shift keying (FSK) the header information; And (b2) recording a wobble signal obtained by frequency shift modulation. The method of claim 13, And said binary data is bi-phase encoded bi-phase data. A method of recording a wobble signal carrying header information on an optical recording medium, (a) providing a first sinusoidal wave having a unit cycle of a recording mark for recording user data on the information track and a second sinusoidal wave having a double multiple of the unit cycle; (b) a high level of the header information represented by binary data corresponds to a signal in which one period waveform of one of the first sinusoidal wave and the second sinusoidal wave is repeated at least twice, and the low level of the header information represented by binary data Modulating the remaining one periodic waveform of the first sinusoidal wave and the second sinusoidal wave corresponds to a signal repeated at least twice; And (c) recording the obtained wobble signal. The method of claim 17, And said binary data is bi-phase encoded bi-phase data. A recording apparatus for recording a wobble signal carrying header information on an optical recording medium, A carrier signal generator for generating different sinusoids having a multiple of a unit cycle of a recording mark for recording user data on the information track; Using the sinusoids generated by the carrier signal generator, the high level of the header information represented by binary data is greater than the least common multiple of integers obtained by dividing the one cycle waveform of the one sinusoid by the multiples of the unit period. Or a low level of the header information represented by binary data, the number of times being equal to or greater than the least common multiple of integers obtained by dividing one period waveform of the remaining one sinusoid by the multiples of the unit period. A wobble signal generation unit configured to generate a wobble signal by modulating the header information so as to correspond to the repeated signal; And And a recording unit for recording the wobble signal generated by the wobble signal generation unit. The method of claim 19, And an encoding unit configured to bi-phase encode the header information. And the wobble signal generating unit modulates header information modulated by the encoding unit. A wobble signal recording apparatus for recording a wobble signal carrying header information on an optical recording medium, A carrier signal generator for generating a first sinusoidal wave having a unit cycle of a recording mark for recording user data on the information track and a second sinusoidal wave having a double multiple of the unit cycle; The high level of the header information represented by binary data corresponds to a signal in which one period waveform of one of the first sinusoidal wave and the second sinusoidal wave is repeated at least twice, and the low level of the header information represented by binary data corresponds to the second level. A wobble signal generation unit configured to generate a wobble signal by modulating the header information such that the remaining one periodic waveform of the first sinusoidal wave and the second sinusoidal wave corresponds to a signal repeated at least twice; And And a recording unit for recording the wobble signal obtained from the wobble signal generation unit. The method of claim 21, And an encoding unit configured to bi-phase encode the header information. And the wobble signal generating unit modulates the bi-phase encoded header information by the encoding unit.