KR100513327B1 - Apparatus and method for modulating and demodulating wobble signal on optical disc - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modulator / method and a demodulator / method of an optical disc wobble signal, comprising: first and second MSK wobble signals modulated and recorded as physical address information on an optical disc such as a recordable CD (CD) or DVD (DVD); By adjusting the second frequencies f ₁ and f ₂ to be correlated with each other, a peak point of the wobble signal is formed at each time point when the frequencies change, and the signal level at the peak point is the original address information. While modulating and recording so as to have a direct correlation with the bit data of the MSK, demodulating the MSK wobble signal, monitoring the level transition period of the peak detection signal of the wobble signal, detecting a wobble data bit clock having a certain period, and On the falling edge of the bit clock, the wobble PLL circuit is not used by detecting and outputting original wobble data based on the level value of the peak detection signal. And, very useful inventors also being able to omit the configuration of the algorithm, and the hardware for the modulation frequency and the phase discriminator,

Description

Modulator / Method and Demodulator / Method of Optical Disc Wobble Signals {Apparatus and method for modulating and demodulating wobble signal on optical disc}

The present invention relates to an optical disc wobble signal modulator / method and a demodulator / method for demodulating a wobble signal recorded as physical address information on an optical disc such as a recordable CD (CD) or DVD (DVD). .

In general, a recordable optical disc, for example, an optical disc such as a DVD-RAM or a DVD-RW (Re-Writable), has a recording surface of an optical disc for controlling a spindle servo operation or providing a clock for recording and reproducing data. Physical address information must be recorded in advance on the screen. A wobble addressing method for recording the physical address information as a wobble signal on an optical disc will now be described.

First, the wobble addressing method using the Complementary Allocated Pit Addressing (CAPA) method is used in the case of the DVD-RAM, and the wobble addressing method using the Land Pre-Pit Addressing method in the case of the DVD-RW. A method and the like have been used. In recent years, a wobble addressing method using a minimum shift keying (MSK) modulation method has been proposed.

Meanwhile, in the MSK modulation scheme, as shown in FIG. 1, an in-phase message of wobble data ( m _I ) and a quadrature message ( m _Q : Quadrature) to be recorded as physical address information on an optical disc. By the combination of message of wobble data, two different frequencies (f ₁ , f ₂ ) and two phases (P ₁ , P ₂ ) are determined, respectively, by the two different frequencies and two phases. Four different waveforms of wobble signals are generated, wherein the two different frequencies, for example, the first frequency f ₁ , have a frequency value higher than the center frequency fc and the second frequency ( f ₂ ) has a frequency value lower than the center frequency f _c ,

The two different phases, for example, the first phase P ₁ have a zero phase, and the second phase P ₂ has a 180 degree phase π. As described above, four different waveforms generated according to the first and second frequencies and the first and second phases, that is, , , , And The MSK wobble signal having? Is expressed by the following equation.

-Formula (1)

Here, T _b represents the wobble data bit duration. For example, as shown in FIG. 2, when the wobble data to be recorded on the optical disc is bit string data of '11010000', the in-phase the combination of the message (m _I) and quadrature phase messages (m _Q) is always so should be (m _I, m _Q), (m _I, m _Q) of the first bit '1', the second bit ' Combination with 1 'results in (1,1), and ( m _I , m _Q ) for the second bit' 1 'becomes (0,1) in combination with the third bit' 0 '. .

Since ( m _I , m _Q ) for the third bit '0' becomes (1,0) by combination with the fourth bit '1', eventually ( m _I , m _Q ) becomes (1 , 1), (1,0), (0,1), (0,0), and the pulse signal corresponding thereto is different from two different frequencies as shown in FIG. You will have four different waveforms with two phases.

Therefore, the MSK wobble signal S _MSK (t) has a smoothly continuous pulse waveform by summing the pulse signals, so that the wobble signal can be recorded more accurately on the optical disc.

On the other hand, in the demodulation device for demodulating the MSK wobble signal read out from the optical disc, as shown in Fig. 3, the analog mixers 10 and 11, the interval integrators 12 and 13, the phase determiners 14 and 15, and logic are shown. A circuit 16 is included. In the analog mixers 10 and 11, the wobble signal read out from the optical disc includes the first and second encoding frequencies ( , ), The wobble signal of the corresponding frequency is extracted, and the interval integrators 12 and 13 integrate the extracted wobble signal of the corresponding frequency in a predetermined section, and in the phase determiner 14 and 15, The integral value is compared with a preset reference value (Threshold = 0) to determine a phase.

The logic circuit 16 then interleaves the determined phase to restore and output the binary sequence bit string data, that is, the original wobble data. Therefore, the MSK wobble signal recorded in the pulse waveform which is naturally continuous by the MSK modulation method is demodulated and output as wobble data without high frequency noise by the demodulation device configured as described above.

However, when the rotational speed of the optical disk is changed by the spindle servo operation in the optical disk device, since the frequency of the wobble signal read out from the optical disk is variable, the first and second encodings applied to the analog mixer 20 respectively. Frequency must be varied, which requires a complex hardware configuration and demodulation algorithm.

Accordingly, the present invention was created to solve the above problems, and includes first and second frequencies of MSK wobble signals (modulated and recorded as physical address information on optical discs such as recordable CDs or DVDs). f ₁ , f ₂ ) are adjusted to be coherence with each other so that a peak point of the wobble signal is formed at each time point when the frequency changes, and the signal level at the peak point is equal to the bit data of the original address information. It is an object of the present invention to provide an apparatus and method for modulating and recording an optical disc wobble signal to have a direct correlation.

In the MSK wobble signal demodulation, the level transition period of the peak detection signal of the wobble signal is monitored to detect a wobble data bit clock having a constant period, and the level of the peak detection signal at the falling edge of the bit clock of the wobble data. SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for demodulating an optical disc wobble signal for detecting and outputting original wobble data based on a value.

In a method of modulating an optical disc wobble signal according to the present invention for achieving the above object, in the method for modulating and recording wobble data to be recorded as physical address information of the optical disc by a minimum shift keying method, Combining the wobble data into an in-phase message (m _I ) and a quadrature message (m _Q ); And a first frequency f ₁ and a second frequency f ₂ , and a first phase p ₁ and a second phase p of the wobble signal corresponding to the combined in-phase and quadrature messages. ₂ ), wherein the first frequency and the second frequency, Wow (T _b = wobble data bit width), and determining the value satisfying k, p = natural number and kp = 1, and k = 2n + 1 (odd 3 or more). Features,

An apparatus for modulating an optical disc wobble signal according to the present invention is an apparatus for modulating and recording wobble data to be recorded as physical address information of an optical disc by a minimum shift keying method, wherein the wobble data is in-phase message (m). Combination means for combining _I ) and quadrature messages m _Q ; According to the combined in-phase and quadrature messages, the first frequency f ₁ and the second frequency f ₂ , and the first phase p ₁ and the second phase p ₂ of the wobble signal corresponding thereto. ), Wherein the first frequency and the second frequency, Wow Determining means for determining a value satisfying k, p = natural number and kp = 1, and k = 2n + 1 (odd or more odd) while being T _b = wobble data bit width; And recording means for modulating and recording a wobble signal having four types of waveforms based on the determined first and second frequencies and the first and second phases,

In addition, the demodulation method of the optical disc wobble signal according to the present invention includes a step of performing A / D conversion of a digital wobble signal after band-pass filtering the analog wobble signal read out from the optical disc; Detecting a peak point of the A / D-converted digital wobble signal and outputting a peak detection signal level shifted from the peak point; Monitoring a level transition period of the peak detection signal to detect a wobble data bit clock having a predetermined period; And detecting and outputting the original wobble data based on the level value of the peak detection signal at the falling edge of the bit clock of the detected wobble data.

The wobble signal demodulation device for an optical disc according to the present invention comprises: filter means for band-pass filtering an analog wobble signal read out from the optical disc; A / D conversion means for A / D converting the band pass filtered analog wobble signal into a digital wobble signal; Slope detection means for detecting a slope change of the A / D converted digital wobble signal; Peak detection means for generating and outputting a peak detection signal that transitions to a low level when the slope is switched from negative to positive and when it is switched from positive to negative; Clock detecting means for monitoring a level transition period of the peak detection signal to detect and output a wobble data bit clock having a predetermined period; And bit detection means for detecting and outputting the original wobble data on the falling edge of the detected wobble data bit clock based on the level value of the peak detection signal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, preferred embodiments of an optical disc wobble signal modulator / method and a demodulator / method according to the present invention will be described in detail with reference to the accompanying drawings.

4 shows a configuration of an apparatus for modulating an optical disc wobble signal according to the present invention. The modulator includes an in-phase and quadrature message combiner 20, a frequency and phase determiner 21, and an MSK wobble signal recorder 22. The in-phase and quadrature message combiner At 20, as described above, the in-phase message m _I and the quadrature message m _Q of the wobble data to be recorded as the physical address information of the optical disc are always combined into ( m _I , m _Q ). .

On the other hand, in the frequency and phase determination unit 21, a combination value of ( m _I , m _Q ), that is, (1,1), (1,0), (0,1), (0,0) Depending on which one determines two different frequencies f ₁ , f ₂ and two phases P ₁ , P ₂ , four different waveforms, i.e. , , , And The MSK wobble signal is generated, wherein the first and second frequencies are determined to be values satisfying the following equation.

--- Equation (2)

--- Equation (3)

Here, K and P are natural numbers and K-P = 1 is satisfied.

That is, the frequency and phase determiner 21 determines the first and second frequencies f ₁ and f ₂ as values satisfying equations (2) and (3) defined by the MSK modulation scheme, respectively. However, if the values of K and P are natural and at the same time determine to have a value satisfying KP = 1, the minimum value of the MSK wobble signal is satisfied when the condition (K, P is a natural number, KP = 1) is satisfied. Alternatively, the maximum peak point is always formed at the time when the first frequency and the second frequency are changed.

For example, when the first frequency and the second frequency satisfy K = 3, P = 2, and KP = 1 , The case is determined in detail as follows.

First, as shown in FIG. 5, when the wobble data to be recorded on the optical disc is '00110' bit string data, the combination of the in-phase message m _I and the quadrature message m _Q is always ( m _I). , m _Q ), so that ( m _I , m _Q ) for the first bit '0' becomes (0,0) by combining with the second bit '0' and the second bit '0' For ( m _I , m _Q ) is (1,0) by combination with the third bit '1'.

Thus, by ( m _I , m _Q = 0,0) for the first bit '0', the second frequency f ₂ has a 180 degree phase π. Is generated, and has a first frequency (f ₁ ) and a zero phase by ( m _I , m _Q = 1,0) for the second bit '0'. Pulse signal is generated.

In addition, by ( m _I , m _Q = 1,1) for the third bit '1', a second frequency f ₂ and a zero phase are obtained. Is generated, and ( m _I , m _Q = 0,1) for the fourth bit '1' has a first frequency f ₁ and a 180 degree phase π. Pulse signal is generated.

That is, when the values of K and P are natural numbers and have a value satisfying K-P = 1, the MSK wobble signal has a minimum / maximum peak point when the first frequency and the second frequency are changed.

On the other hand, as shown in Fig. 6, the demodulation device for demodulating the MSK wobble signal modulated and recorded as described above includes a band pass filter 30, an A / D converter 31, a slope detector 32, and a peak detector ( 33, wobble PLL circuit 34, component indicator 35, frequency and phase detector 36, and address decoder 37, which can be read from the optical disc in the band pass filter 30. The analog wobble signal of the push-pull signal is filtered to a predetermined frequency band to remove high frequency noise components and the like, and the A / D converter 31 converts the band pass filtered analog wobble signal into a digital wobble signal. Will be converted to.

The slope detector 32 monitors and detects the slope of the A / D-converted digital wobble signal, and the peak detector 32 minimizes the point where the detected slope is changed from negative to positive. The peak point is detected, the point where the detected slope is changed from positive to negative is detected as the maximum peak point, and the corresponding peak detection signal is output.

The wobble PLL circuit 34 outputs a wobble PLL signal synchronized with the peak detection signal, wherein the wobble PLL signal is the lowest frequency, that is, the lowest frequency among the plurality of frequencies included in the peak detection signal. It is synchronized to a pulse signal with a long period.

In the meantime, the component indicator 35 repeatedly outputs a component indication signal CI that is transitioned to a high / low level at the rising edge of the wobble PLL signal.

For example, as shown in FIG. 7, the MSK wobble signal output through the band pass filter 30 and the A / D converter 31 has two different frequencies f1 and f2 and two phases. In the case of the pulse signal ① having four waveforms , , , In the case where the peak detector 33 detects the point of time when the slope of the MSK wobble signal is switched from negative to positive and the point of time of positive to negative switching as the minimum / maximum peak points, respectively, and the minimum / maximum peak point. At this point, the peak detection signal (2) which is shifted to the high / low level is output.

On the other hand, the wobble PLL circuit 34 outputs a wobble PLL signal ③ in which high / low levels are repeated by 50% in synchronization with the second frequency f2 of the peak detection signal, and the component indicator In (35), the component indication signal (4), which transitions to the high / low level at the rising edge of the wobble PLL signal, is generated and outputted, wherein the component indication signal, the peak detection signal, and the wobble PLL signal are respectively input. In the frequency and phase detector 36, as shown in Fig. 8, the peaks for each section ⓐ, ⓑ, ⓒ, ⓓ, ... corresponding to one wobble data bit width T _b . Comparing and calculating the detection signal PD and the wobble PLL signal PLL by an exclusive logical sum XOR And compare and integrate the peak detection signal PD and the indication signal CI with an exclusive logical sum XOR. )

Then, the integral value AB is detected and confirmed to be any one of a plurality of preset reference values, for example, Th1 = 0, Th2 = 33, Th3 = 50, Th4 = 66, and Th5 = 100. .

therefore. In the section ⓐ shown in FIG. 7, an integral value (A) obtained by comparing and integrating the peak detection signal PD and the wobble PLL signal PLL by an exclusive logical sum XOR is equal to Th5 = 100 when 100 is viewed as maximum. Since the values are close to each other, the second frequency and the 180-degree phase are detected with reference to the demodulation table shown in FIG. 8, and in the section ⓑ, an exclusive logical sum of the peak detection signal PD and the wobble PLL signal PLL ( Since the integral value A compared and integrated by XOR becomes a value close to Th3 = 50 when the maximum value is 100, the peak detection signal PD is detected while the first frequency is detected with reference to the demodulation table. ) And the component indication signal (CI) compared with the exclusive logic sum (XOR), the integral value (B) becomes close to Th2 = 33 when the maximum is 100, and thus the zero phase is detected. .

In the period ⓒ, the integral value A obtained by comparing and integrating the peak detection signal PD with the wobble PLL signal PLL by an exclusive logical sum XOR is a value close to Th1 = 0 when 100 is viewed as maximum. Therefore, the second frequency and the zero phase are detected with reference to the demodulation table. In the section ⓓ, the peak detection signal PD and the wobble PLL signal PLL are integrally integrated with an exclusive logical sum XOR. Since the integral value A becomes close to Th3 = 50 when the maximum is 100, the first frequency is detected with reference to the demodulation table, and the peak detection signal PD and the component indication signal ( Since the integral value B obtained by comparing CI) with the exclusive OR (XOR) becomes a value close to Th4 = 66 when the maximum is 100, the 180 degree phase is detected.

Accordingly, the frequency and phase detector 36 simply detects the frequency and phase for each MSK wobble signal section corresponding to one wobble data bit width T _b through the above-described process, and the frequency and phase information. Is output to the address decoder 37.

On the other hand, in the address decoder 37, based on the detected frequency and phase, it is possible to detect the combined ( m _I , m _Q ) values inversely when the MSK wobble signal is modulated. As shown in the figure, when the second frequency and the 180 degree phase are detected in the period ⓐ, since the value of ( m _I , m _Q ) becomes (0,0), the bit value of the wobble data is '0'. Is demodulated by

When the first frequency and zero phase are detected in the section ⓑ, the ( m _I , m _Q ) value becomes (1,0), so that the bit value of the wobble data is set to '0'. When the second frequency and zero phase are detected in the section ⓒ, the value of ( m _I , m _Q ) becomes (1,1), so that the bit value of the wobble data is '1'. When the first frequency and the 180-degree phase is detected in the section ⓓ, the value of ( m _I , m _Q ) becomes (0,1), and thus the bit value of the wobble data is set to '1'. As it is demodulated, the bit string of the original wobble data '0011 ..' is finally demodulated sequentially.

On the other hand, the optical disc wobble signal demodulation apparatus and method as described above use a peak detection signal level shifted at the peak point of the wobble signal and a wobble PLL circuit synchronized with the peak detection signal when demodulating the MSK wobble signal. By simply extracting the modulation frequency and phase information of the MSK wobble signal, and demodulating the MSK wobble signal based on the frequency and phase information, the hardware configuration for demodulating the MSK wobble signal can be simplified, as well as the optical disc. The stable wobble signal demodulation operation is possible even when the frequency of the wobble signal read out from the variable varies.

However, this requires a wobble PLL circuit. In addition, an algorithm and hardware configuration for determining the modulation frequency and phase are required. Hereinafter, the wobble PLL circuit is deleted, and the configuration of the algorithm and hardware for discriminating modulation frequency and phase can be omitted. A more detailed modulator / method and demodulator / method for

First, in the frequency and phase determination unit 21 described above with reference to FIG. 4, equations (2) and equations defining first and second frequencies f ₁ and f ₂ in the MSK modulation scheme are described. (3) is determined to satisfy each value, and the values of K and P are determined to be both natural and at the same time satisfying KP = 1, wherein the first frequency (f ₁ ) and the second frequency (f) are determined. ₂ ) each , (n is a natural number).

That is, it is determined that k value of the first frequency is 3 or more odd k = 2n + 1 and p value of the second frequency satisfies 2 or more even 2n smaller than k.

For example, when the k value of the first frequency is '3' and the p value of the second frequency is '2', the first frequency and the second frequency are: , In this case, the analog wobble signals 41 and 42 according to the first frequency are opposite to each other at the start peak and the end peak, as shown in FIG. The analog wobble signals 43 and 44 have the same start peak and end peak.

Accordingly, since the same operation is performed as the precoding by the exclusive logical sum (XOR) that compares the current data with the next data to '1' and the same data to '0', the waveforms of the analog wobble signals are free. The coded data is modulated as it is, resulting in a direct correlation with the original wobble bit data.

That is, since the start peak and the end peak of the analog wobble signal by the first frequency are mutually opposite to each other, the original wobble bit data '1' is modulated as it is, and the start peak and the end peak of the analog wobble signal by the second frequency are Since are equal to each other, the original wobble bit data '0' is modulated as it is.

On the other hand, as shown in FIG. 10, the demodulation device for demodulating the MSK wobble signal modulated and recorded as described above includes a band pass filter 50, an A / D converter 51, a slope detector 52, and a peak detector ( 53, a clock detector 54, a bit detector 55, a sync detector 56, and an address decoder 57, which can be configured to include a push-pull read from an optical disc in the band pass filter 50. The analog wobble signal of the Push-Pull signal is filtered to a predetermined frequency band to remove high frequency noise components and the like, and the A / D converter 51 converts the band pass filtered analog wobble signal into a digital wobble signal. .

The slope detector 52 monitors and detects the slope of the A / D-converted digital wobble signal, and the peak detector 53 minimizes the point where the detected slope is changed from negative to positive. The peak point is detected, the point where the detected slope is changed from positive to negative is detected as the maximum peak point, and the corresponding peak detection signal is output.

For example, as shown in FIG. 11, when the original wobble bit data '0100111011' is calculated by using an exclusive logical OR (XOR) and precoded, the precoded data becomes '110100110', and the first When modulating the analog wobble signal by the frequency and the second frequency, the levels of the start peak and the end peak are opposite to each other or have the same pulse waveform.

Accordingly, the peak detection signal detected and output by the peak detector 53 has two kinds of periods in which the periods of the level transition points are different from each other. In this case, the clock detector 54 determines the level transition points. Each cycle is detected, and a bit clock signal having a constant cycle which is the least common multiple of two different cycles is detected and output.

On the other hand, as shown in Fig. 11, the constant clock bit clock is a clock signal having the same period as the bit transition point of the original wobble bit data. In the bit detector 55, the bit clock signal falls. At the edge, the level value of the peak detection signal detected and output from the peak detector 53 is detected and confirmed.

At this time, the bit detector 55, at the falling edge of the detected bit clock signal, if the level value of the peak detection signal is Low (0), if the high (W1), the wobble data of '1' Detection output.

Accordingly, since the decoded data detected and output by the bit detector 55 is demodulated to the same value of '0100111011' as the original wobble data sequence as shown in FIG. 11, as described above, the wobble PLL circuit It is not necessary to use and it is also possible to omit the configuration of the algorithm and hardware for the modulation frequency and phase discrimination.

Or more, preferred embodiments of the present invention described above, which is posted for the purpose of illustration, those skilled in the art to improve the various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below Changes, substitutions or additions will be possible.

The optical disc wobble signal modulator / method and demodulator / method according to the present invention constructed and constructed as described above are MSK wobble signals modulated and recorded as physical address information on an optical disc such as a recordable CD (CD) or DVD (DVD). The first and second frequencies of f ₁ and f ₂ are adjusted to be coherent with each other so that a peak point of the wobble signal is formed at each time point of change of frequency, but the signal level at the peak point is While modulating and recording so as to have a direct correlation with the bit data of the original address information, while demodulating the MSK wobble signal, the level transition period of the peak detection signal of the wobble signal is monitored to detect a wobble data bit clock having a certain period, On the falling edge of the bit clock of the wobble data, the wobble P is detected by detecting and outputting the original wobble data based on the level value of the peak detection signal. It is a very useful invention that eliminates the need for an LL circuit and also eliminates the configuration of algorithms and hardware for modulation frequency and phase discrimination.

1 is a table illustrating equations and conditions applied to a general MSK wobble signal modulation method.

2 is a waveform diagram of an MSK wobble signal modulated by a general MSK wobble signal modulation method.

3 illustrates a configuration of a demodulation device of a general MSK wobble signal.

4 illustrates a configuration of an apparatus for modulating an optical disc wobble signal according to the present invention.

5 is a waveform diagram of an MSK wobble signal modulated by the optical disc wobble signal modulation method according to the present invention.

6 shows a configuration of an apparatus for demodulating an optical disc wobble signal according to the present invention.

7 shows each signal and wobble data detected and demodulated by the optical disc wobble signal demodulation method according to the present invention;

8 is a table showing reference information applied to a method for demodulating an optical disc wobble signal according to the present invention.

FIG. 9 is a waveform diagram of an analog wobble signal with respect to a first frequency and a second frequency determined by an apparatus and method for modulating an optical disc wobble signal according to another embodiment of the present invention.

FIG. 10 shows a configuration of an apparatus for demodulating an optical disc wobble signal according to another embodiment of the present invention.

11 illustrates each signal and wobble data detected and demodulated by the optical disc wobble signal demodulation method according to another embodiment of the present invention.

※ Explanation of code for main part of drawing

10,11: analog mixer 12,13: interval integrator

14,15: phase determination unit 16: logic circuit

20: I / Q message combination unit 21: frequency and phase determination unit

22: wobble signal recording unit 30, 50: band pass filter

31,51: A / D converter 32,52: Slope detector

33,53: peak detector 34: wobble PLL circuit

35 component indicator 36 frequency and phase detector

37,57: address decoder 54: clock detector

55: bit detector 56: synchronous detector

Claims (13)

A method of modulating and recording wobble data to be recorded as physical address information of an optical disc by a minimum shift keying method, Combining the wobble data into an in-phase message (ml) and a quadrature message (mq); and According to any one of (1,1), (1,0), (0,1), and (0,0), which are four combination values (ml, mq) in which the in-phase and quadrature messages are combined, Four different waveforms, cos (2pf2t + 0) and cos, are determined by determining two different first and second frequencies f1 and f2, and a first phase p1 and a second phase p2. Generate an MSK wobble signal with (2pf1t + 0), cos (2pf1t + p), and cos (2pf2t + p), The first frequency and the second frequency are f1 = k / 2Tb and f2 = p / 2Tb (Tb = wobble data bit width or period of the second frequency), and k, p = natural numbers and kp = 1, and k = 2n. And modulating and recording the data by determining a value satisfying +1 (odd 3 or more). The method of claim 1, The wobble signal modulated and recorded by the second step has a minimum or maximum peak point at the time when the frequency changes, and a signal level at the peak point is directly related to the original wobble bit data. Modulation method of an optical disc wobble signal. An apparatus for modulating and recording wobble data to be recorded as physical address information of an optical disc by a minimum shift keying method, Combining means for combining the wobble data into an in-phase message ml and a quadrature message mq; According to any one of (1,1), (1,0), (0,1), and (0,0), which are four combination values (ml, mq) in which the in-phase and quadrature messages are combined, Four different waveforms, cos (2pf2t + 0) and cos, are determined by determining two different first and second frequencies f1 and f2, and a first phase p1 and a second phase p2. Generate an MSK wobble signal with (2pf1t + 0), cos (2pf1t + p), and cos (2pf2t + p), The first frequency and the second frequency are f1 = k / 2Tb and f2 = p / 2Tb (Tb = wobble data bit width or period of the second frequency), Determining means for determining a value that satisfies k, p = natural number and k-p = 1, k = 2n + 1 (odd 3 or more); And And recording means for modulating and recording wobble signals having four types of waveforms based on the determined first and second frequencies and the first and second phases. . The method of claim 3, The wobble signal modulated and recorded by the recording means has a minimum or maximum peak point when the frequency changes, and the signal level at the peak point is directly related to the original wobble bit data. Optical disk wobble signal modulator. Performing a band pass filtering of the analog wobble signal read out from the optical disc, and then performing A / D conversion to a digital wobble signal; Detecting a peak point of the A / D converted digital wobble signal and outputting a peak detection signal level shifted from the peak point; Monitoring a level transition period of the peak detection signal to detect a wobble data bit clock having a predetermined period; and And detecting and outputting '1' wobble data when the level value of the peak detection signal is low when the level value of the peak detection signal is low on the falling edge of the detected wobble data bit clock. A wobble signal demodulation method for an optical disc. The method of claim 5, In the third step, the wobble signal of the optical disc is monitored by monitoring the level transition period of the peak detection signal and detecting and outputting a clock corresponding to a period of the least common multiple for two different types of cycles as a wobble data bit clock. Demodulation method. delete Filter means for band-pass filtering the analog wobble signal read out from the optical disc; Conversion means for A / D conversion of the band pass filtered analog wobble signal into a digital wobble signal; Slope detection means for detecting a slope change of the A / D converted digital wobble signal; Peak detection means for generating and outputting a peak detection signal that transitions to a low level when the slope is switched from negative to positive and when it is switched from positive to negative; Clock detection means for monitoring a level transition period of the peak detection signal to detect and output a wobble data bit clock having a predetermined period; and And a bit detecting means for detecting and outputting wobble data of '0' if the level value of the peak detection signal is low and '1' if the level value of the peak detection signal is low on the falling edge of the bit clock of the detected wobble data. An optical disk wobble signal demodulation device, characterized in that the configuration. The method of claim 8, The clock detecting means monitors the level transition period of the peak detection signal, and detects and outputs a clock corresponding to a period of the least common multiple for two different types of cycles as a wobble data bit clock. Signal demodulator. delete A method of modulating and recording wobble data to be recorded as physical address information of an optical disc by a minimum shift keying method, comprising: a first frequency f1, a second frequency f2, and a first phase p1; The second phase (p2) is determined and the MSK wobble signal with four different waveforms, cos (2pf2t + 0), cos (2pf1t + 0), cos (2pf1t + p), and cos (2pf2t + p) Create, Let the first frequency and the second frequency to f1 = k / 2Tb and f2 = p / 2Tb (Tb = wobble data bit width or period of the second frequency), K and p are natural numbers, and k-p = 1 and k = 2n + 1 (odd 3 or more), And a difference between the first phase and the second phase is 180 degrees. The method of claim 11, N = 1 for the first frequency and p = 2 for the second frequency, The first phase and the second phase are determined, wherein the first phase is zero, the second phase is 180 degrees, or the first phase is 180 degrees, the second phase is wobble, characterized in that (zero) Signal modulation method. In an optical disc on which physical address information is recorded, An optical disc as claimed in claim 11, wherein said physical address information is recorded by one of the methods of claims 11 to 12.