KR20030083042A - Apparatus and method for demodulating wobble signal on optical disc - Google Patents

Abstract

PURPOSE: A wobble signal demodulating method for an optical disc and a device thereof are provided to precisely and speedily demodulate wobble signals of ADIP units in which MSK(Minimum Shirt Keying) wobble and saw-tooth wave wobble are combined by using a simple digital elements. CONSTITUTION: A wobble signal demodulating device for an optical disc includes a second wide band pass filter(50) disposed on an independent path from a first wide band pass filter(20), a low pass filter(51) formed of a simple R-C circuit, an A/D converter(52) and a level detector(52). The second wide band pass filter filters analogue wobble signals inputted via an independent path from the first wide band pass filter to a frequency band corresponding to the saw-tooth wobble frequency(Wc=fwob,2*fwob) to output the saw-tooth wobble signals after removing the MSK wobble components. The output wobble signals are analogue signals having different level and waveform. The low pass filter automatically controls the offset for the levels of the saw-tooth wobble signals output from the second wide band pass filter according to the charging/discharging operation of the R-C circuit. The level detector outputs a positive or negative saturation value corresponding to plus or minus 5V for the saw-tooth wobble signals corresponding to 'Data 0'/'reference' or 'Data1'. For saw-tooth wobble signals corresponding to 'Monotone' and 'Sync-0,1,2,3', BV(Band Value) corresponding to 0V level is output.

Description

Apparatus and method for demodulating wobble signal on optical disc}

The present invention relates to an optical disc wobble signal demodulation device and method for demodulating a wobble signal recorded as physical address information on an optical disc such as a recordable CD (CD) or a 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 physical address on a recording surface of the optical disc in order to search for a random access or a recording position of data. Although information must be recorded in advance, a wobble addressing method for recording the physical address information as a wobble signal on an optical disc will now be described.

First, in the case of the DVD-RAM, a CAPA (Complementary Allocated Pit Addressing) method is used to record address information of each sector in a pre-pit form at the head of each sector for physical addressing. Although there is an advantage in that addressing for each sector is possible, address information is recorded in units of sectors in the data recording area in which the actual data is to be recorded, which in turn reduces the data recording capacity in which the actual data is to be recorded.

On the other hand, in the case of the next generation high-density optical disk, a wobble addressing method using a minimum shift keying (MSK) wobble modulation method has recently been proposed. The MSK wobble modulation method has a minimum wobble length (NWL) as shown in FIG. Monotone Wobble (MW) with Nominal Wobble Length and MSK Mark Wobble (MM) with 3 NWL.

In addition, as shown in FIG. 1, the monotone wobbles of the minimum wobble lengths NWL1, NWL2, NWL6, and NWL7 and the wobble of the minimum wobble length NWL4 constituting the MSK mark wobble are opposite in phase, and have MSK marks. The wobble of the minimum wobble length NWL3 constituting the wobble and the wobble of the minimum wobble length NWL5 constituting the MSK mark wobble also have opposite phases.

In addition, the monotone wobbles of the minimum wobble lengths NWL1, NWL2, NWL6, and NWL7 and the wobble of the minimum wobble length NWL4 constituting the MSK mark wobble have the same wobble frequency f _wob and the MSK mark wobble The wobble of the minimum wobble lengths NWL3 and NWL5 constituting has a frequency (1.5 X f _wob ) higher than the wobble frequency f _wob .

As described above, the MSK wobble modulation scheme is composed of a combination of four wobbles having different frequencies and phases. Recently, in the wobble addressing scheme using MSK wobble modulation, a portion of the monotone wobble of FIG. As shown in Fig. 2, a method of transforming into saw-tooth wobble to express specific information has been proposed.

On the other hand, in the sawtooth wave wobble, for example, information of "0" and "1" can be represented by two or more minimum wobble lengths NWL2 and NWL3 by successive wobbles having the same phase and sawtooth shape. For example, sawtooth-shaped wobble corresponding to “0” and “1” have opposite phases.

In the MSK wobble modulation addressing method to which the sawtooth wave is added, as shown in FIG. 3, eight types of Address In Pre-Groove Word (ADIP) units, that is, a monotone unit and a data start indication information unit, are illustrated. Reference address, synchronization signal units Sync 0 to 3, and data units Data 0 and 1 represent physical address information.

Meanwhile, each of the units has a total of 56 minimum wobble lengths (NWL 0 to 55), and the first to third minimum wobble lengths (NWL 0 to 2) of the units are each composed of MSK mark wobbles. At this time, the 1st to 3rd minimum wobble lengths NWL 0 to 2 and the 15th to 17th minimum wobble lengths NWL 14 to 16 of the data unit Data 0 indicating "0" are MSK mark wobbles. The 19th to 55th minimum wobble lengths NWL 18 to 54 are configured as sawtooth wobble corresponding to "0", and monotone wobble is formed at the remaining minimum wobble length other than that.

On the other hand, the 1st to 3rd minimum wobble lengths NWL 0 to 2 and the 13th to 15th minimum wobble lengths NWL 12 to 14 of the data unit Data 1 indicating "1" are MSK mark wobbles. The 19th to 55th minimum wobble lengths NWL 18 to 54 are configured as sawtooth wobble corresponding to " 1 ", and monotone wobble is formed at the remaining minimum wobble lengths other than that.

On the other hand, in the demodulation apparatus of the optical disc wobble signal for reading out the above-described MSK wobble and sawtooth wobble from the optical disc and demodulating the information into physical address information, as shown in FIG. Analog mixer 10 for mixing (f _msk , f _stw ), analog segment integrator 11 for integrating the MSK wobble and sawtooth wobble according to the reset pulse, and MSK wobble respectively. The first and second samples & holders 12 and 13 for sampling the interval integration values of the signal and the sawtooth wobble signal, respectively, for accumulating for a predetermined time period, for example, for a total of 56 minimum wobble lengths (NWL 0 to 5) intervals. ) Is configured to include.

The MSK wobble determination unit 14 for determining and outputting a sequence of "0" or "1" corresponding to the MSK wobble signal according to the cumulative integral value of the MSK wobble signal output from the first sample & holder 12. And a sawtooth wobble determination unit for determining and outputting a sequence of "0" or "1" corresponding to the sawtooth wobble signal according to the cumulative integral value of the sawtooth wobble signal output from the second sample & holder 17 17) and corresponding to the MSK wobble signal and the sawtooth wave wobble signal according to the sum of the cumulative integral values mixed by the analog mixer 15 after being output from the first and second samples & holders 12 and 13, respectively. The MSK & sawtooth wobble decision unit 16 for determining and outputting a sequence of " 0 " or " 1 " is included.

Therefore, in the demodulation device of the optical disc wobble signal, the cumulative integration corresponding to the MSK wobble signal and the sawtooth wobble signal, respectively, using the analog mixer 10, the interval integrator 11, and the samples & holders 12 and 13, respectively. A value is detected, and a sequence of “0” or “1” corresponding to the cumulative integral value is determined and output by using the wobble determination units 14, 16, and 17. As described above, the physical address information for the eight types of ADIP units having a total of 56 minimum wobble lengths (NWL 0 to 55) combined with the MSK wobble and the sawtooth wave is demodulated and output.

However, this requires analog components such as an analog mixer, an interval integrator, and a sample & holder, so that the demodulator is complicated / large in size, and in order to demodulate the sawtooth wobble signal, one ADIP unit is required. Since a total of 56 minimum wobble lengths NWL 0 to 55 must be sequentially integrated, demodulation time becomes long.

Accordingly, the present invention was created to solve the above problems, and an optical disc wobble for quickly and accurately demodulating wobble signals of an ADIP unit having a combination of MSK mark wobble and sawtooth wobble, using simple digital construction means. It is an object of the present invention to provide an apparatus and method for demodulating a signal.

1 illustrates a waveform of a typical MSK wobble signal,

2 shows waveforms of a typical saw-tooth wobble signal,

FIG. 3 illustrates types of ADIP units represented by general MSK wobble signals and saw-tooth wobble signals.

FIG. 4 shows a part of an analog demodulation device for a general optical disc wobble signal.

5 illustrates a configuration of an apparatus for demodulating an optical disc wobble signal according to the present invention,

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

7 and 8 illustrate respective signals and saw-tooth wobble data detected and demodulated by the optical disc wobble signal demodulation method according to the present invention;

9 illustrates a configuration of an apparatus for demodulating an optical disc wobble signal according to another embodiment of the present invention.

10 and 11 show respective signal waveforms of the sawtooth wave wobble signal detected by the optical disc wobble signal demodulation device according to another embodiment of the present invention;

12 is a flowchart illustrating a method of demodulating an optical disc wobble signal according to another embodiment of the present invention;

13 illustrates MSK binary sequences applied to an optical disc wobble signal demodulation method according to another embodiment of the present invention.

14A and 14B illustrate binary sequences of ADIP units detected by the method for demodulating an optical disc wobble signal according to another embodiment of the present invention,

FIG. 15 is a table showing the structure of an ADIP word applied to an optical disc wobble signal demodulation method according to another embodiment of the present invention.

※ Explanation of code for main part of drawing

10,15: analog mixer 11: analog section integrator

12,13: Sample & Holder 14,16,17: Wobble Determination

20,27,50: Bandpass filter 21,52: A / D converter

22: slope detector 23: peak detector

24: clock detector 25: bit detector

26: sequence determination unit 28, 53: level detector

29: address decoder 30: sync detector

51: low pass filter

In accordance with another aspect of the present invention, a method for demodulating an optical disc wobble signal includes: an MSK wobble sequence corresponding to an MSK wobble signal included in an analog wobble signal read from an optical disc, and a sawtooth wave wobble included in the analog wobble signal. Detecting and generating a sawtooth wobble sequence corresponding to the signal, respectively; And demodulating the original wobble data sequence with reference to the respective detected and generated MSK wobble sequences and the sawtooth wobble sequence, wherein the sawtooth wobble sequence is input through a path independent of the MSK wobble sequence. Characterized in that the detection is generated by the analog wobble signal,

In addition, the apparatus for demodulating an optical disc wobble signal according to the present invention comprises: first sequence generating means for generating an MSK wobble sequence for an analog wobble signal read out from the optical disc; Second sequence generating means for generating a sawtooth wobble sequence for the analog wobble signal; And a demodulation means for demodulating the original wobble data sequence with reference to the MSK wobble sequence and the sawtooth wave wobble sequence, wherein the second sequence generation means is provided through a path independent of the first sequence generation means. A sawtooth wobble sequence for the input analog wobble signal is generated.

First, the apparatus and method for demodulating an optical disc wobble signal according to the present invention are described in detail in Korean Patent Application No. 02-007943, filed February 14, 2002, filed by the present applicant. Sawtooth wave as described above with reference to FIGS. 1 to 3 while demodulating the MSK wobble signal of an optical disc that has been pre-coded and modulated according to a modulation method by using a peak detection method. Simple demodulation of the wobble signal using a band pass filter (BPF), a level detector, and the like, which is proposed in the present invention, a preferred embodiment of the apparatus and method for demodulating an optical disc wobble signal according to the present invention will be described below. An example will be described in detail with reference to the accompanying drawings.

Fig. 5 shows a configuration of an apparatus for demodulating an optical disc wobble signal according to the present invention. The demodulation device includes first and second band pass filters 20 and 27, an A / D converter 21, a slope detector 22, a peak detector 23, a clock detector 24, and a bit detector 25. And a sequence determiner 26, a level detector 28, an address decoder 29, and a synchronization detector 30. The first bandpass filter 20 includes a push-pull read from an optical disc. Analog wobble signal of the (Push-Pull) signal, for example, the MSK wobble recorded in accordance with the wobble signal modulation method described in detail in Korean Patent Application No. 02-007943, and described above with reference to Figs. An analog wobble signal of an ADIP unit having a combination of sawtooth wave wobbles is filtered to a frequency band corresponding to the MSK wobble frequency (Wc = f _wob , 1.5 * f _wob ) to remove high frequency noise components, and the A / In the D converter 21, the bandpass filtered analog wobble signal is converted into a digital signal. The wobble signal is converted.

The slope detector 22 monitors and detects a slope of the A / D-converted digital wobble signal, and the peak detector 23 converts the detected slope from negative to positive. The point is detected as the minimum peak point, and the point at which 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. 6, when the original bit data '0100111011' is calculated by using an exclusive logical OR (XOR) and precoded, the precoded data becomes '110100110', which is the first frequency. In the case of modulating the analog wobble signal by the second frequency and the second frequency, the start peak and the end peak have opposite pulse levels.

Therefore, the peak detection signal output by the peak detector 23 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 24 provides the period of the level transition points. Are respectively detected, and a bit clock signal having a constant period which becomes the least common multiple of two different types of cycles is detected and output.

On the other hand, as shown in Fig. 6, the bit clock of the predetermined period becomes a clock signal having the same period as the bit transition point of the original wobble bit data. In the bit detector 25, the bit clock signal falls. At the edge, the level value of the peak detection signal detected and output from the peak detector 23 is detected and confirmed.

At this time, the bit detector 25, at the falling edge of the detected bit clock signal, the wobble data of '0' if the level value of the peak detection signal is Low, and '1' if the high (High) Detection output.

Accordingly, the wobble data sequence decoded and output by the address decoder 29 and demodulated as address information is demodulated to the same value of '0100111011' as the original MSK wobble data sequence as shown in FIG.

Meanwhile, the sawtooth wobble signal described above with reference to FIGS. 1 to 3, for example, as shown in FIG. 7, When a sawtooth wobble signal corresponding to "0" having a frequency and a phase of "0" is read from the optical disc, the sawtooth wobble signal has a second band after the high frequency component is removed by the first bandpass filter 20. It is output to the pass filter 27.

At this time, the sawtooth wave wobble signal corresponding to "1", for example, as shown in FIG. The sawtooth wobble signal corresponding to "1" having a frequency and phase of? Is also output to the second bandpass filter 27 after the high frequency component is removed by the first bandpass filter 20, and thus, the sawtooth wave The wobble signal of substantially the same waveform from which the component was removed is output to the said second bandpass filter.

That is, since the high frequency component of the sawtooth wave which distinguishes "0" and "1" is removed by the first bandpass filter 20, the wobble signal having almost the same waveform is transmitted to the second bandpass filter 27. Is output.

However, in the second band pass filter 27, the filter is performed at the frequency band corresponding to the sawtooth wobble frequency (Wc = f _wob , 2 * f _wob ) and a 90 degree phase shift is performed. Of the sawtooth wave wobble signal Of the sawtooth wave wobble signal corresponding to " 0 " 7 and 8, waveforms having different phases are output to the level detector 28.

Meanwhile, in the level detector 28, the sawtooth wave wobble output from the second band pass filter 27 at the rising / falling edge of the peak detection signal detected and output by the peak detector 23. The level of the signal is detected and confirmed.

At this time, when the level of the sawtooth wobble signal output through the second band pass filter 27 is a high level, a "1" corresponding to a high level is output to the sequence determiner 26 so as to output the sequence determiner. At 26, it is possible to determine that the sawtooth wobble signal is wobble data corresponding to "0".

On the other hand, when the level of the sawtooth wobble signal output through the second band pass filter 27 is at the low level, the sequence determiner 26 outputs "0" corresponding to the low level to the sequence determiner 26. In (26), it is possible to determine that the sawtooth wobble signal is wobble data corresponding to "1".

Accordingly, the sequence determiner 26 sends the address decoder 29 to the address decoder 29 based on the sawtooth wobble sequence detected and output from the level detector 28 and the MSK wobble sequence output from the bit detector 25. The wobble data sequence to be output is determined.

On the other hand, in the sync detector 30, a bit clock of a predetermined period output from the bit detector 25, for example, a 56-bit sync unit described above with reference to FIGS. When the sync pattern is detected with reference to the bit clock, but the sync pattern is not detected correctly, for example, some defects exist in the optical disc, and thus the sync pattern is not normally detected. In this case, the synchronization detection error signal is output to the sequence determiner 26.

When the synchronization detection error signal is input, the sequence determiner 26 determines that an error has occurred in the MSK wobble sequence input at that time, and at this time, the detection output from the level detector 28 is detected. The sawtooth wobble sequence is selected and determined as the wobble data sequence to be output to the address decoder 29.

That is, the sequence determination unit 26 selects and determines the MSK wobble sequence output from the bit detector 25 and outputs the synchronization detection error signal from the synchronization detector 30 while outputting the MSK wobble sequence to the address decoder 29. Is input, when the sawtooth wobble sequence output from the level detector 28 is selected and output to the address decoder 29 at that time, it is incorrectly detected in the state where a synchronization detection error has occurred as described above. It is possible to prevent the demodulated output of the prepared MSK wobble sequence from the original wobble data, so that accurate wobble data can be demodulated.

In addition, the sequence determiner 26 checks only some of the "0" sequences or "1" sequences continuously detected and output from the level detector 28, so that the sawtooth wobble signal is "1" or "0". It is possible to quickly determine whether this is true.

9 illustrates a configuration of another embodiment of an optical disc wobble signal demodulation device according to the present invention. The demodulation device includes a first band pass filter 20, as described above with reference to FIG. A / D converter 21, slope detector 22, peak detector 23, clock detector 24, bit detector 25, sequence determiner 26, level detector 28, address decoder 29 And a synchronous detector 30 and a low pass filter composed of a second band pass filter 50 disposed on a path independent from the first band pass filter 20, and a simple RC circuit. 51, and an A / D converter 52 and a level detector 53 are included.

Accordingly, in the second band pass filter 50, an analog wobble signal input through a path independent of the first band pass filter 20 corresponds to a sawtooth wobble frequency (Wc = f _wob , 2 * f). _wob ) Sawtooth wobble signal from which the MSK wobble component has been removed is output by band filtering to the frequency band.

In this case, the sawtooth wobble signal output through the second band pass filter, for example, the sawtooth wobble signal corresponding to 'Data 0' and 'Data 1', respectively, have different levels and waveforms. It is output as an analog sawtooth wave wobble signal.

In the low pass filter 51, an offset with respect to the level of the sawtooth wobble signal output through the second band pass filter 50 by the charge / discharge operation of the capacitor C included in the RC circuit ( Offset) is automatically adjusted and the level of the offset adjusted signal is integrated.

As a result, as shown in FIG. 10, the sawtooth wobble signal corresponding to 'Data 0' gradually saturates from a voltage level of 0 V to a voltage level of + 5 V after about 5 sawtooth wobble passes, and the +5 V On the other hand, the sawtooth wobble signal corresponding to 'Data 1' is gradually saturated from 0 V voltage level to -5 V voltage level after about 5 sawtooth wobble signals have passed. Maintain the voltage level.

Meanwhile, as shown in FIG. 3, 37 identical sawtooth wobble represented by '0' are included in the ADIP unit corresponding to 'Data 0' and 'Reference', and the ADIP unit corresponding to 'Data 1' is included in the ADIP unit corresponding to 'Data 1'. Since 37 identical sawtooth wobble represented by '1' are repeatedly included, a period in which the voltage level gradually decreases or increases during the passage of about 5 sawtooth wobble as described above is a voltage level of + 5 V or-5 V. Since it is relatively much shorter than the section to be saturated, the level detector 53 can then normally detect a state where the voltage level is saturated to + 5V or -5V.

In addition, as illustrated in FIG. 3, ADIP units that do not include the sawtooth wobble, that is, the sawtooth wobble signal corresponding to 'Monotone' and 'Sync_0,1,2,3', are configured as the second bandpass filter ( 50) and the low pass filter 51 have a voltage level of 0V.

Therefore, the sawtooth wobble signal corresponding to 'Data 0' and 'Reference' is output at a voltage level of + 5 V, and the sawtooth wobble signal corresponding to 'Data 1' is output at a voltage level of-5 V, and ' The sawtooth wobble signals corresponding to Monotone 'and' Sync_0,1,2,3 'are output at a 0 V voltage level.

On the other hand, the A / D converter 52 performs A / D conversion and outputs the analog sawtooth wave wobble signal output as described above. In the level detector 53, as described above with reference to FIG. At the rising / falling edge of the peak detection signal output from the peak detector 23, the level of the A / D converted sawtooth wobble signal is detected and outputted accordingly. .

That is, in the level detector 53, as shown in FIG. 11, in the case of the sawtooth wobble signal corresponding to 'Data 0' and 'Reference', a PSV (Positive Saturation Value) corresponding to a voltage level of +5 V is provided. In the case of the sawtooth wobble signal corresponding to 'Data 1', a negative saturation value (NSV) corresponding to a −5 V voltage level is output. In addition, in the case of the sawtooth wobble signals corresponding to 'Monotone' and 'Sync_0,1,2,3', a BV (Band Value) corresponding to a 0 V voltage level is output.

Accordingly, the sequence determination unit 26 refers to the voltage level values detected and output from the level detector 58, that is, the voltage level values of PSV (+ 5V), NSV (-5V), and BV (0V). Further, it is confirmed whether or not the MSK sequence detected and outputted from the bit detector 25 is correctly detected. Further, in the address decoder 29, according to the data bits output from the sequence determiner 26, the physical address is determined. It outputs the information ADIP word, which will be described in detail below.

FIG. 12 is a flowchart illustrating another embodiment of the method for demodulating an optical disc wobble signal according to the present invention. In the sequence determiner 26, 56 MSK data bits continuously output from the bit detector 25 are shown. After sequentially storing them, as shown in FIG. 13, one of the matching ADIP units is detected (S30) by comparing with the eight types of ADIP units.

In addition, in the sequence determiner 26, when the ADIP unit detected as described above is an ADIP unit corresponding to 'Sync 0, 1, 2, 3' or 'Monotone' (S31), the level detector 53 When the voltage level value of the sawtooth wobble output from the sawtooth wobble is a voltage level value (BV) close to 0 V (S32), the detected corresponding ADIP unit ('Sync 0) Packet data corresponding to '1,2,3' or 'Monotone' is detected and output to the address decoder 29 (S33).

On the other hand, when the ADIP unit detected as described above is an ADIP unit corresponding to 'Reference' or 'Data 0' (S34), the sequence determiner 26 outputs the sawtooth wobble output from the level detector 53. When the voltage level value of the sawtooth wobble is a voltage level value PSV close to + 5 V (S35), the detected corresponding ADIP unit ('Reference' or 'Data 0') is checked. The packet data corresponding thereto is detected and output to the address decoder 29 (S33).

When the ADIP unit detected as described above is an ADIP unit corresponding to 'Data 1' (S36), the sequence determiner 26 determines the voltage level value of the sawtooth wave wobble output from the level detector 53. In this case, when the voltage level value of the sawtooth wobble is a voltage level value (NSV) close to −5 V (S37), packet data corresponding to the detected corresponding ADIP unit ('Data 1') is detected. In operation S33, the signal is output to the address decoder 29.

On the other hand, the sequence determiner 26 determines that a wobble signal detection error has occurred due to a defect of an optical disc when the detected ADIP units do not match all eight types of ADIP units. At this time, the current packet data position is checked (S38).

That is, as shown in FIGS. 14A and 14B, when 56 data bits detected and output from the bit detector 25 do not coincide with all eight types of ADIP units, the above process is normally performed. The previous packet data detected is confirmed. For example, the previous packet data normally detected is data corresponding to the 10th (ADIP unit number 9) of 83 ADIP units as shown in FIG. 15. In the case of the unit data_x, the packet data corresponding to the ADIP type to be detected currently is determined as the data unit data_x corresponding to the 11th (ADIP unit number 10), and the corresponding packet data (Pseudo Packet Data) is determined. ) Is output to the address decoder 29 (S39).

Meanwhile, the address decoder 29 sequentially stores the 83 packet data detected or generated as described above (S40), and then refers to the 83 packet data to store one ADIP word as physical address information ( ADIP Word = 83 ADIP Units) to perform a series of operations (S41).

Meanwhile, in the sequence determiner and the address decoder, valid sync units (Sync 0, Sync 1, Sync 2, Sync 3), as shown in FIG. 13, are generated and temporarily stored in the lyrics packet data as described above. Is detected continuously, ignores the generation and processing operation of the ADIP word, which is physical address information, and newly generates and processes the ADIP word with reference to the packet data to be detected or generated after the valid synchronization units are detected. The operation will be performed again.

Accordingly, the ADIP units can be detected and output with reference to the sawtooth wobble signal more accurately, and it is possible to prevent the incorrect physical address information from being output by randomly generated lyrics packet data.

In the address decoder 29, when the lyrics packet data is generated as described above, particularly when the lyrics packet data corresponding to the data unit Data_x is generated, a dictionary of 'Data 0' or 'Data 1' is used. Only the lyrics packet data corresponding to any one of the ADIP units set in, for example, the lyrics packet data of the ADIP unit corresponding to 'Data 0' is repeatedly generated.

In this case, as described above, the lyrics packet data corresponding to the data unit has a probability of 50%, and various methods for improving the accuracy of the lyrics packet data corresponding to the data unit higher than 50%. May be further applied, and after generating a separate identification flag for identifying a detection error instead of generating the lyrics data, various compensation methods for compensating the detection error may be additionally applied.

In addition, the sequence determiner 26 and the address decoder 29 may be integrated into one component to perform the same functions and operations as described above.

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 apparatus and method for demodulating an optical disc wobble signal according to the present invention constructed and configured as described above includes an MSK wobble sequence corresponding to an MSK wobble signal included in an analog wobble signal read out from an optical disc, and a sawtooth wave wobble included in the analog wobble signal. MSK wobble by detecting and generating the sawtooth wobble sequence corresponding to the signal in parallel or independently, respectively, and demodulating and outputting the original wobble data sequence to the physical address information of the optical disc with reference to the MSK wobble sequence and the sawtooth wobble sequence. It is a very useful invention that can quickly and accurately demodulate the wobble signals of an ADIP unit having a combination of a and a sawtooth wave wobble using simple digital construction means.

Claims (24)

First sequence generating means for generating an MSK wobble sequence for the analog wobble signal read out from the optical disc; Second sequence generating means for generating a sawtooth wobble sequence for the analog wobble signal; A demodulation means for demodulating the original wobble data sequence with reference to the MSK wobble sequence and the sawtooth wobble sequence; And said second sequence generating means generates a sawtooth wave wobble sequence for an analog wobble signal input through a path independent of said first sequence generating means. The method of claim 1, In the second sequence generating means, A band pass filter for band pass filtering the analog wobble signal; A low pass filter for low pass filtering the band pass filtered wobble signal; An A / D converter for A / D converting the low pass filtered wobble signal; And And a level detector for detecting the level of the A / D converted digital wobble signal. The method of claim 2, And the band pass filter demodulates the analog wobble signal into a frequency band of (Wc = f _wob , 2 * f _wob ). The method of claim 2, And the low pass filter comprises an R-C circuit for offset-adjusting the level of the band pass filtered wobble signal and integrating and outputting the voltage level of the wobble signal. The method of claim 2, The level detector detects the level of the A / D converted wobble signal at the rising / falling edge of the peak detection signal detected by the first sequence generating means, and outputs three different types of sequences. And a demodulation device for an optical disc wobble signal. The method of claim 5, The level detector may distinguish between a case where the sawtooth wobble is an ADIP unit of 'Sync 0,1,2,3 or Monotone', an ADIP unit of 'Reference or Data 0', and a case of 'Data 1', respectively. And demodulating and outputting three different voltage level values. The method of claim 6, The demodulation means checks and determines the ADIP unit detected by the 56 data bits outputted from the first sequence generating means by the three voltage level values outputted from the level detector. The demodulation device for an optical disc wobble signal, characterized by outputting the formed ADIP word as physical address information. The method of claim 7, wherein The demodulation means further includes a level value close to zero voltage from the level detector while the ADIP unit detected by the 56 data bits is an ADIP unit of 'Sync 0,1,2,3 or Monotone'. And outputting a packet data corresponding to the corresponding ADIP unit when the BV is output. The method of claim 7, wherein The demodulation means, if the ADIP unit detected by the 56 data bits is an ADIP unit of 'Reference or Data 0' and the level value PSV of the reference highest voltage is output from the level detector, the corresponding ADIP An apparatus for demodulating an optical disc wobble signal, characterized by detecting packet data corresponding to a unit. The method of claim 7, wherein The demodulation means, when the ADIP unit detected by the 56 data bits is an ADIP unit of 'Data 1' and outputs a level value NSV of the reference lowest voltage from the level detector, An apparatus for demodulating an optical disc wobble signal, characterized by detecting corresponding packet data. The method of claim 7, wherein The demodulation means includes at least one or more packets previously detected when the ADIP unit corresponding to the 56 data bits is not detected or the voltage level value corresponding to the ADIP unit is not detected from the level detector. And demodulating the pseudo packet data of the ADIP unit to be detected at present with reference to the data. The method of claim 7, wherein The demodulation means sets an identification flag for indicating a detection error when an ADIP unit corresponding to the 56 data bits is not detected or when a voltage level value corresponding to the ADIP unit is not detected from the level detector. And demodulating the optical disc wobble signal. The method of claim 7, wherein The demodulation means, when generating the ADIP word consisting of the 83 ADIP units, when packet data corresponding to the synchronization units Sync 0, 1, 2, 3 are sequentially detected or generated, the synchronization unit And demodulating and outputting a new ADIP word. Detecting and generating an MSK wobble sequence corresponding to the MSK wobble signal included in the analog wobble signal read out from the optical disc and a sawtooth wobble sequence corresponding to the sawtooth wobble signal included in the analog wobble signal; And And demodulating the original wobble data sequence by referring to the MSK wobble sequence and the sawtooth wobble sequence respectively detected and generated, The sawtooth wobble sequence is detected and generated by an analog wobble signal input through a path independent of the MSK wobble sequence. The method of claim 14, The first step, A first step of band-pass filtering the analog wobble signal input through the path independent of the MSK wobble sequence to a frequency band of (Wc = f _wob , 2 * f _wob ); Low pass filtering the band pass filtered wobble signal; A lower three step of A / D converting the low pass filtered wobble signal; And And detecting the level of the A / D-converted digital wobble signal, and outputting the same as three different types of sawtooth wobble sequences. The method of claim 15, In the second sub-step, the low pass filter composed of an RC circuit is used to offset-adjust the level of the bandpass filtered wobble signal and then integrally output the voltage level of the wobble signal. Demodulation device. The method of claim 15, The lower four steps include detecting and confirming the level of the low pass filtered and A / D converted wobble signal at the rising / falling edge of the peak detection signal detected in the process of detecting and outputting the MSK wobble sequence. There are three different types that can be distinguished from the case of 'Sync 0,1,2,3 or Monotone', the case of 'Reference or Data 0' ADIP unit, and the case of 'Data 1'. And demodulating and outputting a voltage level value. The method of claim 17, In step 2, after confirming and determining the ADIP unit detected by 56 data bits in the MSK wobble sequence by the three voltage level values, an ADIP word composed of 83 ADIP units is output as physical address information. And demodulating the optical disc wobble signal. The method of claim 18, In the second step, the ADIP unit detected by the 56 data bits is an ADIP unit of 'Sync 0, 1, 2, 3 or Monotone', and the zero voltage among the three voltage level values is determined. And detecting the packet data corresponding to the ADIP unit when a close level value BV is output. The method of claim 18, In the second step, the ADIP unit detected by the 56 data bits is an ADIP unit of 'Reference or Data 0' and the level value PSV of the reference highest voltage among the three voltage level values is output. And demodulating packet data corresponding to the corresponding ADIP unit. The method of claim 18, In the second step, when the ADIP unit detected by the 56 data bits is an ADIP unit of 'Data 1' and the level value NSV of the reference lowest voltage among the three voltage level values is output, And demodulating packet data corresponding to the ADIP unit. The method of claim 18, In step 2, at least one previously detected when the ADIP unit corresponding to the 56 data bits is not detected or the voltage level value corresponding to the ADIP unit is not detected among the three voltage level values. A method of demodulating an optical disc wobble signal, characterized by generating pseudo packet data of an ADIP unit to be detected currently with reference to at least one packet data. The method of claim 18, In step 2, when the ADIP unit corresponding to the 56 data bits is not detected or the voltage level value corresponding to the ADIP unit is not detected from the level detector, an identification flag for indicating a detection error is set. And demodulating the optical disc wobble signal. The method of claim 18, In the second step, when generating the ADIP word consisting of the 83 ADIP units, when the packet data corresponding to the synchronization units Sync 0, 1, 2, 3 are sequentially detected or generated, the synchronization unit And demodulating and generating a new ADIP word.