CN1732515B - Swing information detection method - Google Patents

Abstract

The invention is composed of the following tracks of the recording medium: a carrier region that continuously oscillates with a carrier oscillation of a specific carrier period; and an address area wobbled in a special wave wobble having a period different from that of the carrier wobble and determining a phase corresponding to data 0 and data 1 of the information stored by the wobble.

Description

Wobble Information Detection Method

technical field

The present invention relates to phase-change, write-once, magneto-optical and other recording media, a method for detecting the wobble period and a method for detecting wobble information of the recording medium, a wobble information detection circuit for detecting wobble information from the recording medium, and an information recording and reproducing device.

Background technique

Tracks are formed in recording areas on recording media (optical discs) such as DVD+R discs and DVD+RW discs. This track functions as a guide groove for a spot of laser light irradiated for recording and reproducing information.

Wobbles (meanders) are formed on this track, and since a signal detected from the wobble has a substantially constant period, the detected wobble signal is mainly used as rotational speed information.

In addition, by modulating the wobble, information other than the rotational speed information described above can also be stored in the track. The most common type of information stored by wobble is address information indicating an absolute position on a recording medium.

In addition, the characteristics of the recording medium, that is, the size of the recording medium, or the recording type indicating whether the recording medium is a write-once type or a rewritable type, or recording characteristics, that is, information such as parameters such as optimal recording power or recording waveform, or the name of the manufacturer wait.

Next, each wobble format of a CD-type recording medium (CD-R disc, CD-RW disc, etc.) and a DVD+-type recording medium (DVD+R disc, DVD+RW disc, etc.) will be described.

- CD-like recording media: Biphase modulation is performed on address information and the like, and the track is wobbled by frequency modulation based on this (for example, refer to Japanese Patent Application Laid-Open No. 9-212871).

Specifically, in CD-like recording media, two frequencies of 22.05 kHz±1 kHz are assigned to data 0 and data 1, and information is recorded using wobbles of about 10 cycles for 1 bit. In addition, the clock signal is detected from 22.05 kHz which is the center frequency by setting the probability of occurrence of data 0 and data 1 to be substantially equal.

- DVD+-like recording media: address information is phase-modulated, and the track is wobbled based on this.

In DVD+ type recording media, a clock signal is detected by extracting carrier components from carrier wobbles that occupy most of the carrier region. In the address information, information is stored in the address area by setting a wobble of the same phase as the carrier wobble as data 0 and a (reversed) wobble with a phase difference of “180” degrees from the carrier wobble as data 1 .

However, the wobbling of the conventional CD-type recording medium and DVD+-type recording medium has the following problems.

In the wobble format of recording media such as CDs, a clock signal of 22.05 kHz is extracted, and since the frequency difference between data 0 and data 1 is very small as ±1 kHz, the S/N of the signal is low and the recording quality of information is poor. In addition, there are disadvantages that it is difficult to determine the correctness of the frequency change point, and the accuracy of the absolute position is poor.

On the other hand, in a wobble format of a recording medium such as DVD+, the S/N of a signal can be improved by using phase modulation. In addition, absolute position accuracy can also be ensured by setting the carrier area, which becomes a new format.

However, the synchronization wobble and the information wobble have the same modulation method, and the synchronization signal and the information signal are distinguished by the difference in phase-inverted wobble length, so it takes time to pull in synchronization. In addition, since information is recorded with the same cycle and only phase modulation, the incorporation of wobble components of adjacent tracks is significantly reflected in the deterioration of the information signal, and it is difficult to simultaneously ensure the reliability of the detected information and the recording quality, and advance further High density of narrow track pitch.

Contents of the invention

A general object of the present invention is to provide an improved and useful recording medium, a method for detecting a wobble period, a method for detecting wobble information, a circuit for detecting wobble information, and an information recording and reproducing apparatus which solve the problems of the prior art.

A more detailed object of the present invention is to propose a wobble format capable of ensuring future densification, high reliability, and stability in recording media, and to detect the wobble period and information of the format.

In order to achieve this object, in the recording medium of the present invention, the structure of the track is divided into: the first area, which wobbles continuously through the first wobble of a specific carrier cycle; and the second area, which wobbles with the second wobble, and the second The wobble has a cycle different from the first wobble and a phase is determined corresponding to data 0 and data 1 of information stored by the wobble.

Furthermore, in order to achieve this object, in the wobble cycle detection method of the present invention, the wobble signal obtained from the wobble of the track written on the recording medium is multiplied by a multiplier, and the wobble signal obtained by the phase is multiplied. The signal obtained by the multiplication is input to a band-pass filter whose passing band is set to be approximately twice the frequency of the carrier, and the period of the output signal of the band-pass filter is twice the period of the carrier of the wobble signal.

In addition, in order to achieve the object, the wobble information detection method of the present invention includes: a carrier wave processing step of extracting the frequency component of the first wobble from the first area of the recording medium; a special wave processing step of extracting the frequency component of the first wobble from the second area of the recording medium extracting a phase information component of the second wobble; and an information detecting step of detecting information stored by wobbling from the phase information component extracted by the special wave processing step based on the frequency component extracted by the carrier wave processing step.

Furthermore, in order to achieve the object, the wobble information detection circuit of the present invention includes: a wobble cycle detection circuit for detecting the cycle of a carrier wave from a wobble signal obtained from the wobble of a track engraved on a recording medium; a clock signal generation circuit based on the a period of the carrier wave detected by the wobble period detection circuit, generating a second clock signal with twice the period of the carrier wave; and a special wave wobble detection circuit, based on the second clock signal, representing the position of the second wobble of the second region or phase.

In addition, in order to achieve this object, the information recording and reproducing apparatus of the present invention is equipped with a wobble information detection circuit, based on the information detected by the wobble information detection circuit, the target position of the recording medium is accessed, and the recording medium is accessed. Information recording and reproduction.

The recording medium, the wobble period detection method, the wobble information detection method, the wobble information detection circuit, and the information recording and reproducing device of the present invention propose a method that can ensure future high density, high reliability, and stable wobble in the recording medium format, and the period and information of the wobble of the format can be detected at the same time.

The present invention provides a method for detecting wobble information for a recording medium in which a track as a guide groove is divided into: a carrier area, which wobbles continuously through a first wobble groove of a specific carrier period; and an address area, which has a second wobble groove , the second wobble slot has an integer multiple of the carrier cycle and a period different from that of the first wobble slot, and the second wobble slot corresponds to data 0 and data 1 of information stored by the wobble slot determining a phase, the second wobbled groove and an occurrence position of the second wobbled groove wobbled by the information,

It is characterized in that the swing information detection method includes:

a carrier wave processing step of extracting a frequency component of a first wobble groove from a carrier region of said recording medium; a special wave processing step of extracting a phase information component of a second wobble groove from an address region of said recording medium; and an information detection step , detecting information stored by wobbling the groove from the phase information component extracted by the special wave processing step based on the fractional-integer frequency component extracted by the carrier wave processing step.

The present invention also provides a method for detecting wobble information, which is used for the following recording medium: the track as the guide groove is divided into: the carrier area, which is continuously wobbled by the first wobble groove of a specific carrier period; and the address area, which has the second wobble groove , the second wobble slot has an integer multiple of the carrier cycle and a period different from that of the first wobble slot, and the second wobble slot corresponds to data 0 and data 1 of information stored by the wobble slot determining a phase, the second wobbled groove and an occurrence position of the second wobbled groove wobbled by the information,

It is characterized in that the swing information detection method includes:

The carrier wave processing step extracts the frequency component of the first wobble groove from the carrier region of the recording medium, and generates a clock that is at least twice the period of the specific carrier wave; the special wave processing step extracts the frequency component of the first wobble groove from the address of the recording medium extracting a phase information component of the second wobbled groove based on a clock at least twice the specified carrier period in the region; and an information detecting step of detecting the phase information component stored through the wobbled groove from the phase information component extracted by the special wave processing step Information.

Description of drawings

Other objects, features, and advantages of the present invention will be further clarified by reading the following description while referring to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of a general recording medium also applicable to one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a phenomenon in which the amplitude of a wobble signal varies in a recording medium according to an embodiment of the present invention.

Fig. 3 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the first to fourth embodiments of the present invention.

FIG. 4 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the first to fourth embodiments of the present invention.

FIG. 5 is a diagram showing an example of a wobble shape that distinguishes bit 0 representing data 0 and bit 1 representing data 1 in the recording medium according to the embodiment of the present invention.

6 is a waveform diagram showing an example of a wobble waveform that is an integer multiple of the period of carrier wobble as an example of special wave wobble of a recording medium according to an embodiment of the present invention.

7 is a waveform diagram showing a wobble waveform in a case where the period of the special wave wobble of the recording medium is twice that of the carrier wobble and the length is changed in the embodiment of the present invention.

Fig. 8 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the eighth embodiment to the tenth embodiment of the present invention.

Fig. 9 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the eighth to tenth embodiments of the present invention.

Fig. 10 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the eighth embodiment to the tenth embodiment of the present invention.

Fig. 11 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the fourteenth embodiment of the present invention.

12 is a diagram collectively showing waveforms of wobbles provided in the carrier area, address area, and synchronization area of the recording medium according to the embodiment of the present invention.

13 is a diagram showing the shape of the wobble in the recording medium and the waveform of the signal detected by the wobble according to the eleventh and twelfth embodiments of the present invention.

14 is a block diagram showing the structure of a wobble period detection circuit for realizing the wobble period detection method according to the twenty-fourth embodiment of the present invention and the structure of a wobble period detection circuit in the background art thereof.

FIG. 15 is a waveform diagram showing signal waveforms of a wobble signal input to the multiplier 32 shown in FIG. 14 and an output signal thereof.

Fig. 16 is an explanatory diagram showing the track format of the recording medium according to the thirteenth embodiment and the fourteenth embodiment of the present invention.

Fig. 17 is a diagram showing wobble shapes in two synchronous periods of the recording medium according to the embodiment of the present invention.

Fig. 18 is a diagram showing the track format of the recording medium and the wobble shapes in two synchronous periods according to the thirteenth embodiment and the fourteenth embodiment of the present invention.

Fig. 19 is an explanatory diagram showing specific examples of wobble modulation in recording media according to the nineteenth to twenty-first embodiments of the present invention.

Fig. 20 is similarly an explanatory diagram showing specific examples of wobble modulation in the recording media of the nineteenth to twenty-first embodiments of the present invention.

Fig. 21 is similarly an explanatory diagram showing specific examples of wobble modulation in the recording media of the nineteenth to twenty-first embodiments of the present invention.

Fig. 22 is a block diagram showing the configuration of wobble information detection circuits according to the 30th to 35th embodiments of the present invention.

23 is a waveform diagram showing output waveforms of each circuit in the case of reproducing the recording medium in the wobble format of type 1 shown in FIG. 12 in the wobble information detection circuit shown in FIG. 22 .

FIG. 24 is a waveform diagram showing waveforms of output signals of each part when modulated using SIN wave signals under conditions of phase 0° and phase 180° in the wobble information detection circuit shown in FIG. 22 .

Fig. 25 is an explanatory diagram of the format of recording media according to the fifteenth embodiment and the sixteenth embodiment of the present invention.

Fig. 26 is a diagram for explaining the simplest method of checking the phase state by the wobble information detection circuits of the thirty-second embodiment and the thirty-third embodiment.

Fig. 27 is a waveform diagram showing an example of the wobble shape of the format of the recording medium according to the eighteenth embodiment of the present invention.

FIG. 28 is a waveform diagram showing signal waveforms when the wobble shape of type A in FIG. 27 is demodulated.

Fig. 29 is a block diagram showing the configuration of an information recording and reproducing apparatus according to a thirty-sixth embodiment and a thirty-seventh embodiment of the present invention.

FIG. 30 is an explanatory diagram of detection of a wobble signal from the light receiving element 94 of FIG. 29 to the arithmetic circuit 102 .

FIG. 31 is a block diagram conceptualizing the wobble information detection circuit shown in FIG. 22 .

Detailed ways

Hereinafter, the best mode for carrying out the present invention will be specifically described based on the drawings.

FIG. 1 is a diagram showing the structure of a general recording medium applied to one embodiment of the present invention.

The recording medium 1 is an optical disc such as a DVD+R disc or a DVD+RW disc, and as shown in FIG. 1( a ), tracks 2 are formed concentrically or spirally on the recording surface. The track 2 is composed of grooves 3 and lands 4 as shown in FIG. 1( b ).

This track 2 is prepared in advance by a recording medium forming device, and the recording device performs recording and reproduction of information along the track 2 of the recording medium.

In addition, as the rotation information in the recording medium, the groove 3 of the track 2 wobbles (meanders) when rotating at a constant linear velocity or a constant angular velocity so that a certain frequency (a certain period) can be detected. This swinging part is called the swing.

In CD-R discs, CD-RW discs, DVD+R discs, and DVD+RW discs, the wobble of the track 2 is set to a substantially constant frequency, and a portion with a slightly changed frequency or phase is provided to record information such as an address.

In addition, as shown in FIG. 1( a ), the shape of the wobble is usually wavy, but any carrier component can be extracted. For example, it may be a saw shape, a triangular wave shape, or a trapezoid shape.

By changing the frequency and phase of the wobble as described above, information can be actively communicated in the field of communication. In order to allow multiple channels to be used in communication, the reference frequency used by the transmitter and receiver is fixed, so it is possible to create a carrier component using the output of an oscillator with little frequency fluctuation.

Of course, the carrier component is sometimes extracted from the transmitted signal, but for fine adjustment, the frequency does not change during communication. Furthermore, the characteristics of the communication path include random frequency band interference (noise), but the same frequency band as the frequency band used for communication does not constantly mix in the interference.

On the other hand, these points are different in recording media such as optical discs. The recording medium is controlled to maintain a constant rotation, but only a motor with low rotation stability is used to reduce the weight and size of the propulsion device. Therefore, the recording medium usually rotates unstable and the linear velocity varies.

Therefore, it is necessary to extract the reference carrier component from the wobble on the recording medium, and it is necessary to be able to demodulate the information following the change of the linear velocity of the rotational fluctuation.

Another big difference is that the oscillating carrier frequency has constant noise added. In order to increase the recording density of the tracks on the recording medium to the limit, the space between the tracks is narrowed. Since it is narrower than the diameter of the light spot, the end of the light spot covers the wobble of the adjacent track. Consequently, wobble components from adjacent tracks get mixed in (this is called 'crosstalk'). This refers to the incorporation of interference in the same frequency band as the signal to be demodulated. In this case, the detected wobble signal fluctuates in amplitude due to this influence.

FIG. 2 is an explanatory diagram of a phenomenon in which the amplitude of a wobble signal fluctuates in a recording medium. As shown in FIG. 2(a), in the case where the wobble of the track (referred to as 'target track') 2a on which the spot SP is irradiated, and the wobbles of adjacent adjacent tracks 2b and 2c adjacent thereto are in phase (in phase), The signals cancel each other out, so the amplitude of the wobble signal of the wobble detected by the irradiation of the spot SP decreases.

On the other hand, as shown in FIG. 2(b), in the case where the wobble of the track 2d on which the spot SP is irradiated and the wobbles of the neighboring tracks 2e and 2f adjacent thereto are in antiphase (antiphase), they reinforce each other, so The amplitude of the wobble signal of the wobble detected by the irradiation of the light spot SP increases.

That is, there is no concept of crosstalk in the communication field, and transmission close to the theoretical limit calculated by setting interference noise as random is possible, but only very low signal quality can be obtained in a system using wobble of the recording medium.

For example, in the DVD+R/RW format of an optical disk, high information detection stability is required even with such low quality, and a two-phase phase modulation method is adopted.

However, in a synchronization signal or the like in which the phase is reversed by “180” degrees as the wobble for synchronization, only the reversed portion has a wobble signal characteristic opposite to that of the nearby carrier wobble.

Since most of the wobble is the carrier wobble, the crosstalk component can also be considered as the carrier component. Specifically, when the carrier wobble portion of the target track is out of phase with the adjacent wobble, most of the detected wobble signals have large amplitudes. However, only the phase-inverted wobbles for synchronization are in-phase, so they cancel each other out and the amplitude decreases.

Therefore, by phase modulation of the carrier cycle, due to the bad influence of crosstalk, the variation of the demodulation result is large, and the S/N is deteriorated. In the DVD+ type, not only synchronous information but also address information and recording medium information are stored by this phase modulation method, so the information demodulation performance is slightly lowered. However, since the synchronization information has a constant cycle, interpolation is possible even if the demodulation performance is slightly lowered.

That is, a particularly strong modulation scheme is required for crosstalk, which is not considered a problem in the communication field.

3 and 4 are explanatory views showing the format of wobbles formed on the track of the recording medium according to the first to fourth embodiments of the present invention.

As shown in common with FIG. 3 and FIG. 4 , the recording medium of the first embodiment to the fourth embodiment forms a carrier area (hereinafter also referred to as a 'first area') 10 on the track, which occupies most of the area in the track, and A part of the address area (hereinafter also referred to as 'second area') 11 .

The carrier region 10 continuously oscillates by detecting a carrier wobble (hereinafter also referred to as "first wobble") 14 of a wobble signal of a certain period and a certain phase.

Since a stable wobble signal can be detected in this carrier region 10, it is used for clock generation. In the detection of wobble, not only the above-mentioned crosstalk but also recorded information components recorded by the user become noise, so frequency separation thereof is required.

Because it depends on the detection circuit method or the frequency characteristics of the recorded information, it cannot be specified, but generally the cycle of the carrier wave is about 20 to 200 times the reference clock cycle of the recorded information.

Also, if it is too long (low frequency) above this, the control frequency band of the servo system of the required position control detection point (light spot) on the track will be close to the control frequency band, so the wobble detection cannot be performed.

In order to record address information, the address area 11 needs two wobble shapes representing "0" (hereinafter also referred to as "data 0") and "1" (hereinafter also referred to as "data 1").

In the recording medium of the first embodiment, the address area 11 is wobbled by a special wave wobble (hereinafter also referred to as "second wobble") which is detected to have the same characteristics as the carrier wobble (hereinafter also referred to as "first wobble"). )14 The detected carrier wobble signal (hereinafter also referred to as "the first wobble signal") has different periods, and the special wave wobble signal (hereinafter also referred to as "Second Wobble Signal").

In the recording medium of the second embodiment, as shown in FIG. 3, the address area 11 is wobbled by a special wave wobble 12 detected to have a period different from a carrier wobble signal detected by a carrier wobble 14, and has a stored The special wave wobble signal of the phase corresponding to the data 0 of the information. Or oscillate by special wave wobble 13 which detects a special wave wobble signal having a period different from the carrier wobble signal detected by carrier wobble 14 and having a phase corresponding to data 1 of the stored information.

That is, the address area 11 is wobbled by special wave wobbles 12 and 13 detected to have a period different from the first wobble signal detected by the carrier wobble 14, and the data 0 and data 1 of the stored information have a difference of 180, respectively. degrees of phase wobble signal. In this way, in the case where the phases of the special wave oscillating by 180 degrees are different according to the information (in the case of assigning the phases with the difference of 180 degrees respectively), it is easiest to assign the phase 0 degree to the data 0 and the phase 180 degrees to the data 1, of course, respectively 90 degrees may be assigned to data 0, and 270 degrees may be assigned to data 1.

In addition, as shown in FIG. 4, the address area 11 can also be wobbled by combining a carrier wobble 14 and a special wave wobble detection having a cycle different from the carrier wobble signal detected by the carrier wobble 14, and by storing information Data 0 and Data 1 respectively have wobble signals with a phase difference of 180 degrees. In this figure, the case of detecting the special wave wobble 12 of the special wave wobble signal having the phase corresponding to the stored information data 0 is shown.

In addition, in the recording medium of the third embodiment, the occurrence positions are different by the special wave wobble 12 corresponding to the data 0 and the special wave wobble 13 corresponding to the data 1 of the information.

Furthermore, in the recording medium of the fourth embodiment, by the special wave wobble 12 corresponding to the data 0 and the special wave wobble 13 corresponding to the data 1 of the above-mentioned information, the generation positions are relatively made to differ by the respective periodic portions.

Furthermore, in the recording medium of the fifth embodiment, the cycle of the special wave wobble is set to an integer multiple of the cycle of the carrier wave. Thus, the period of the special wave wobble signal detected by the special wave wobble is an integer multiple of the period of the carrier wobble signal detected by the carrier wobble.

Furthermore, in the recording medium of the sixth embodiment, the period of the special wave wobble is set to be twice the period of the carrier wobble. Therefore, the period of the special wave wobble signal detected by the special wave wobble is twice the period of the carrier wobble signal detected by the carrier wobble.

Furthermore, in the recording medium of the seventh embodiment, the length of the special wave wobble is set to be twice the period of the carrier wobble. Therefore, the length of the special wave wobble signal detected by the special wave wobble is twice the length of the carrier wobble signal detected by the carrier wobble.

FIG. 5 is a diagram showing an example of a wobble shape that distinguishes bit (Bit) 0 representing data 0 and bit (Bit) 1 representing data 1.

Fig. 5(a) is a diagram showing relative positions on the basis of the carrier wobble period on the track by #0 to #8.

FIG. 5( b ) shows an example of the wobble shape of bit 0 representing data 0 and bit 1 representing data 1 when information is provided on the wobble position of a special wave.

FIG. 5( c ) shows an example of the wobble shape of bit 0 representing data 0 and bit 1 representing data 1 in the case where information is provided on the wobble phase of a special wave.

FIG. 5( d ) shows an example of the wobble shape of bit 0 representing data 0 and bit 1 representing data 1 in the case where information is provided for both the position and phase of the wobble of a special wave.

Here, as the special wave wobble, it means having twice the period of the carrier wobble (period twice the period of the carrier wobble signal), and having twice the length of the carrier wobble (twice the length of the carrier wobble signal). A case of swinging shapes.

First, the wobble shape in the case where information is provided for the wobble position of the special wave shown in FIG. , #4, #5, #6, #7, and #8 are configured with carrier wobbles, and special wave wobbles 20 that are continuous in phase with the carrier wobbles are arranged at positions #2 and #3 of the track. In addition, when it is bit (Bit) 1 of data 1, the carrier wobble is arranged at positions #0, #1, #2, #3, #6, #7, and #8 of the track, and the carrier wobble and phase are continuous The special wave swing 20 is configured in the #4 and #5 positions of the track.

In this way, the phase of the special wave wobble is continuous with the carrier wobble in both the case of bit 0 and bit 1, but since the two occur at different positions, respective information can be detected. Here, it shows the situation where bit 0 and bit 1 change the occurrence position. More simply, bit 0 and bit 1 can be distinguished by configuring special wave wobbles and unconfigured wobbles at positions #2 and #3 of the track. .

For example, the timing at which the phase of the particular wave wobbles is at "90" degrees can be distinguished by discriminating the wobble signal voltage. However, by changing the occurrence position of the special wave oscillation, the amount of information increases, so the accuracy is further increased.

Next, the wobble shape of the case where information is provided for the phase of the special wave wobble shown in FIG. , #5, #6, #7, and #8 are configured with carrier wobbles, and special wave wobbles 20 that are continuous in phase with the carrier wobbles are arranged at positions #2 and #3 of the track. In addition, when it is bit 1 of data 1, the carrier wobble is also arranged at the positions of #0, #1, #4, #5, #6, #7, and #8 of the track, and there will be a phase difference of 20 from the special wave wobble. Special wave wobbles 21 with a phase of "180" degrees are arranged at positions #2 and #3 of the track. That is, the wobble in the recording medium of the first example, the second example, the third example, the fifth example, the sixth example, and the seventh example is shown.

In this way, in the case of bit 0 and bit 1, the occurrence position of the special wave wobble is set to be the same, but the relationship between bit 0 and bit 1 is reversed by changing the phase of both by "180" degrees, so that High-quality information detection can be performed in a detection circuit described later.

Next, the wobble shape of the case where the position and phase of the special wave wobble shown in Fig. 5(d) provides information. Carrier wobbles are placed at positions #4, #5, #6, #7, and #8, and special wave wobbles 20 that are continuous in phase with the carrier wobbles are placed at positions #2 and #3 on the track. In addition, when it is bit 1 of data 1, the carrier wobble is arranged at the position of #0, #1, #2, #3, #6, #7, #8 of the track, and there will be a phase difference of 20 from the special wave wobble" The special wave wobble 21 with a phase of 180" degrees is arranged at positions #4 and #5 of the track. That is, the wobble in the recording medium of the first example, the third example, the fourth example, the fifth example, the sixth example, and the seventh example is shown.

In this way, by combining both the position and the phase, #2 to #5 of the track are used, so the amount of information increases, and the reliability can be improved by carefully designing the demodulation circuit.

As described above, all 4 cycles of carrier wobble can be used for 2 cycles of special wave wobble, but in this case, the ratio of special wave wobble to the whole increases, and the special wave wobble component in crosstalk increases. In the effect of using the special wave wobble of 2 times the period, it is important to reduce the special wave wobble as much as possible because the crosstalk component accounts for most of the carrier component. However, if the special wave oscillation interval is sufficiently long, the defects will be reduced, so two cycles of the special wave oscillation may be used.

Next, the length of the period in the recording medium of the fifth embodiment will be further described.

FIG. 6 is a waveform diagram showing an example of a wobble waveform that is an integer multiple of the period of the carrier wobble as an example of the special wave wobble.

FIG. 6( a ) shows the wobble shape of the special wave wobble 22 having a period twice (two periods) the period of the carrier wobble 14 .

FIG. 6( b ) shows the wobble shape of the special wave wobble 23 having a period three times (three periods) the period of the carrier wobble 14 .

FIG. 6( c ) shows the wobble shape of the special wave wobble 24 having a period four times (four periods) the period of the carrier wobble 14 .

In addition, FIG. 7 is a waveform diagram showing a wobble waveform in a case where the wobble period of the special wave is changed to be twice as long as the carrier wobble.

FIG. 7( a ) shows a wobble shape of a special wave wobble 25 having a wobble that is 1 cycle long of the carrier wobble 14 , which is twice (2) the period of the carrier wobble 14 .

FIG. 7( b ) shows a wobble shape of a special wave wobble 26 that is a wobble that is twice (2) times the period of the carrier wobble 14 and has two cycles of the carrier wobble 14 .

FIG. 7( c ) shows a wobble shape of a special wave wobble 27 which is a wobble long with three periods of the carrier wobble 14 , which is twice (2) times the period of the carrier wobble 14 .

FIG. 7( d ) shows a wobble shape of a special wave wobble 28 having a wobble that is four cycles long of the carrier wobble 14 , which is twice (2) times the period of the carrier wobble 14 .

In this way, when the period of the special wave wobble is an integer multiple of the period of the carrier wobble, the influence of crosstalk can be avoided by the special wave wobble, and the reference clock for demodulation can be easily generated from the clock generated by the carrier wobble.

In addition, one cycle of the special wave wobble may be allocated to one bit of information, but it may be equal to or greater than two cycles as described above. However, in addition to the above defects, the length of adding 1 bit of information reduces the amount of information that can be stored in the wobble, so it should be shortened as much as possible. Therefore, it is most effective to have a period twice as long as the period of the carrier wobble (2 times the period) and to be twice as long.

Next, in the recording medium of the eighth embodiment, a synchronization area including a synchronization wobble distinguishable from the carrier wobble and the special wave wobble is formed on the track.

Furthermore, in the recording medium of the ninth embodiment, the synchronization wobble has the same period as the carrier wobble and has a phase difference of 180 degrees from the carrier wobble.

Furthermore, in the recording medium according to the tenth embodiment, the sync area is arranged immediately before the address area on the track.

Furthermore, in the recording medium of the eleventh embodiment, the carrier area is arranged immediately before the synchronization area.

Furthermore, in the recording medium of the twelfth embodiment, the length of the carrier area arranged immediately before the synchronization area is set to be five times or more long than the cycle of the carrier wobble.

Furthermore, in the recording medium of the thirteenth embodiment, the synchronization areas are arranged at regular intervals in the track, and the address areas are arranged intermittently and closely to the synchronization areas.

Furthermore, in the recording medium of the fourteenth embodiment, the length of the synchronization wobble of the synchronization area located near the address area and the synchronization wobble of the synchronization area separately arranged from the address area are lengths are different.

8 to 10 are explanatory diagrams showing the formats of wobbles formed on the tracks of recording media according to the eighth to tenth embodiments of the present invention, and the same reference numerals are assigned to the parts common to those in FIG. 3 and FIG. 4 .

In the recording media of the eighth embodiment to the tenth embodiment, the carrier area (first area) 10, a part of the address area (second area) 11, which is compatible with the carrier area 10, is formed on the track, which occupies most of the track. Synchronization area 15 (hereinafter also referred to as "third area") of synchronization wobble (hereinafter also referred to as "third wobble") that distinguishes between carrier wobble of wobble and special wave wobble of wobble in address area 11 .

The synchronization wobble signal detected from the synchronization wobble in the synchronization area 15 is used as a synchronization signal indicating the location (position) of the address area 11 .

Therefore, the synchronization wobble included in the synchronization area 15 preferably has a shape different from the carrier wobble or special wave wobble, and can be distinguished from these wobbles.

For example, as shown in FIG. 8, the synchronization wobble 16 in the recording media of the eighth embodiment to the tenth embodiment is preferably set to have the same period as the carrier wobble 14, have the length of one period of the carrier wobble 14, and have the same period as the carrier wobble 14. A waveform with a phase difference of 180 degrees by 14 wobbles. In this case, the synchronization wobble 16 is arranged at the front in the synchronization area 11, and the carrier wobble 14 is arranged continuously thereafter.

In addition, it is also possible to change the generation position of the aforementioned wobble 16 for synchronization. For example, as shown in FIG. 9 , a synchronization wobble 16 may be arranged in the carrier wobble 14 in the synchronization area 11 . The figure shows the case where the special wobble 12 is used in the address area 12 of the figure.

In addition, as shown in FIG. 10( c ), the synchronous wobble 16 may be as long as two cycles of the carrier wobble. In any case, it is sufficient as long as the carrier wobble can be distinguished from the synchronization wobble.

Fig. 11 is an explanatory diagram showing the format of wobbles formed on the track of the recording medium according to the fourteenth embodiment of the present invention.

In the case where two kinds of synchronization wobbles are required in the recording medium of the fourteenth embodiment, as shown in FIG. 11( d) and FIG. A wobble 16' is sufficient for long synchronization of 4 periods of wobble. In particular, if they are distinguished by having the same period but different lengths, the demodulation circuit can also be shared, and at the same time, it is easy to accurately grasp the positional relationship with the address area. Regarding the special wave wobble in FIG. 11, as shown in FIG. 11(d) and FIG. 11(e), waveforms in the recording media of the second and fourth embodiments are shown.

12 is a diagram collectively showing waveforms of wobbles provided in the carrier area, the address area, and the synchronization area.

13 is a diagram showing the shape of the wobble in the recording medium of the eleventh embodiment and the twelfth embodiment and the waveform of a signal detected from the wobble.

FIG. 13(b) shows the shape of the carrier wobble 14 inserted in the 3-cycle carrier field between the synchronization wobble 16 in the synchronization field and the special wave wobble 13 (or 12) in the address field.

13(c) shows the shape of the carrier wobble 14 inserted in the 3-cycle carrier region between the synchronization wobble 16 in the sync region and the special wave wobble 12 (or 13) in the address region.

In order to extract the carrier wobble signal (carrier component) of the carrier wobble from the wobble shown in Fig. 13, the output of the BPF is binarized by a band-pass filter (BPF) that cuts unnecessary noise, and sent to the clock generation unit , but the signal is messed up in the modulation part of the swing. Although it also depends on the characteristics of BPF, confusion occurs during the number of carriers.

14 is a block diagram showing the structure of a wobble period detection circuit for realizing the wobble period detection method according to the twenty-fourth embodiment of the present invention and the structure of a wobble period detection circuit in the background art thereof.

As shown in Figure 14(a), in a general wobble period detection circuit, a wobble signal is input to a band-pass filter (BPF) 30 whose wobble frequency (fw) is the pass frequency band, and the output signal is converted from a binary The binarization circuit (COMP) 31 binarizes and sends to the subsequent PLL circuit. In this PLL circuit, high-frequency components are removed to generate a clock signal synchronized with the wobble signal. In terms of the characteristics of the BPF 30, when a phase-modulated or frequency-modulated signal such as the address area shown in FIG. The post-stage PLL circuit has a bad influence.

In the case of the wobble shown in (ii) of FIG. 13(c) (in the case of inserting a wobble of 3 cycles of carrier wobble between the synchronization wobble of the synchronization area and the special wave wobble of the address area), due to the synchronization wobble Since the output from the BFP30, which is close to the special wave wobble, is continuously disturbed, which indicates the period of the carrier wave wobble, the operation of the PLL circuit is unstable, and the synchronization of the clock signal to the wobble signal is easily broken.

Therefore, in the case of general BPF30, since the cycle is restored after 3 cycles in the carrier wobble, by inserting at least 5 cycles of the carrier region between the sync region and the address region, the signal indicating the cycle of the carrier wobble can be temporarily restored. Stabilizes the operation of the PLL circuit.

FIG. 15 is a waveform diagram showing signal waveforms of a wobble signal input to the multiplier 32 shown in FIG. 14 and an output signal thereof.

As shown in FIG. 14(b), in the wobble period detection circuit implementing the wobble period detection method of the twenty-fourth embodiment, the wobble signal (the wobble signal shown in FIG. 15(a) and FIG. 15(b) respectively) is also input into the multiplication The two input terminals of device 32. That is, the wobble signal is multiplied by the multiplier 32, but as a result of the multiplication, a signal with no disturbance in the phase modulation portion of the carrier wobble cycle may be extracted (see FIG. 15(c)).

However, since the frequency is twice the frequency of the wobble signal, the pass band of the BPF33 and the operating frequency of the PLL circuit are doubled, and the frequency divided by 2 is used as the clock of the carrier wobble component. If this is used, the instability factor of the clock signal which is a problem due to the continuity of the synchronization area and the address area is reduced, and there is no need to insert a long carrier area between the synchronization area and the address area.

In the recording medium of the thirteenth embodiment, the synchronization areas are arranged at regular intervals in a track, and the address areas are arranged intermittently and closely to the synchronization areas.

In addition, in the recording medium of the fourteenth embodiment, the length of the synchronization wobble of the synchronization area located in the vicinity of the address area and the length of the synchronization wobble of the synchronization area arranged separately from the address area are length is different.

Fig. 16 is an explanatory diagram showing the track format of the recording medium according to the thirteenth and fourteenth embodiments.

On the track of the recording medium of the thirteenth embodiment and the fourteenth embodiment, as shown in Figure 16 (b), the synchronization area (only shown as the "synchronization" area) 15 is arranged at a certain interval, and the synchronization area 15 discontinuously and close to the configuration address area (the area denoted as 'AD' in the figure) 11 .

In addition, as shown in FIG. 16( a ), the synchronization area 15 and the address area 11 may always be arranged close to each other.

For example, in the usual formats of recording media such as DVD+R discs and DVD+RW discs, as shown in FIG. 16(a), the sync area 15 and the address area 11 are arranged as a set close to each other. Of course, the address area 11 is mainly input with address information, but if there is surplus information, information such as characteristics of the recording medium can also be input, so it needs to be inserted as frequently as possible.

However, as described above, only a signal of a disordered cycle is detected by the wobble cycle detection circuit from a set of the synchronization area 15 and the address area 11 . Therefore, in order to extract a stable clock signal from the wobble of the carrier, the frequency of insertion into the address region is not increased too much.

It has already been explained that the cycle of the synchronization area and the address area is disturbed, but of course, in the case where the synchronization area in which the phase is modulated by only one period of wobble is arranged alone, the disturbance of the binarized signal representing the wobble cycle is also small, and almost All are removed in the clock generation circuit of the subsequent stage, so there is no adverse effect on the clock. If the synchronization area is frequently configured, the time to see the synchronization area for the first time is also short, and as will be described later, the phase comparison between the SIN wave signal (fw) and the SIN wave signal (fw/2) can be frequently performed, so early The wobble shift is found so that a corrective process can be performed. Therefore, it is preferable to insert only the synchronization area frequently independently of the address area.

Fig. 17 is a diagram showing wobble shapes in two types of synchronization areas.

In addition, as shown in FIG. 16(b), as a synchronous area (referred to as "synchronous area A" in the figure) 15 passing through the address area 11 as a group, and sandwiched in the carrier area 10 and separated from the address area 11 separately 17 shows an example in which the number of phase modulation wobbles is changed.

The number 'x' of '#x' described in FIG. 17(a) is the number per cycle of the carrier wobble with the leading wobble of the synchronization area 15 being the 0th. In order to determine the correct wobble position by the synchronization area 15 arranged in a group with the address area 11, phase modulation of one cycle of the carrier wobble of '#0', that is, modulation of one wobble is preferable.

However, in order to prevent erroneous detection due to noise in the separate synchronization area 15', and to clearly indicate the division of address information, two cycles of carrier wobbles of '#0' and '#1' different from the synchronization area 15 are used The phase modulation of , that is, the modulation of 2 wobbles.

Fig. 18 is a diagram showing the track format of the recording medium according to the thirteenth embodiment and the fourteenth embodiment and the wobble shapes in two types of sync areas.

FIG. 18(a) shows an example in which the address area 11 and the synchronization area 15 are arranged adjacently in a group. 18(b) shows an example in which synchronization areas 15 are arranged at regular intervals and address areas 11 are arranged intermittently.

In FIG. 18(b), the address area 11 is configured for each of the two synchronous areas 15 and 15', but of course it is not limited to this, as long as it is based on the amount of information stored in the address area, or the synchronous lead-in of the synchronous area is used. Velocity, or the segmentation of the information stored in the wobble, determines the proportion of the synchronization area that is individually configured.

For example, if the purpose is to increase the synchronization pull-in speed or to check the wobble shift, it is better to configure the address area with a frequency of 10 or less in the synchronization area. Also, if it is segmented based on the information stored in the wobble, it is preferable to insert every 50 to 100.

The synchronization wobble of the previous synchronization area 15 in the address area 11 shown in FIG. 18(b) performs phase modulation of one cycle of carrier wobble, and the synchronization wobble of the separately arranged synchronization area 15' performs phase modulation of four cycles of carrier wobble. modulation.

For example, if the purpose is to increase the synchronization pull-in speed or to check the wobble shift, it is preferable to arrange the cycle area in the number of 10 or less groups between the address areas. The insertion frequency of this address area is determined by the amount of necessary information, but is preferably about 50 to 100. This is because considering the safety of a circuit that extracts a clock from a carrier region in a general-purpose circuit design, the total length of the synchronization field and the address field needs to be approximately 10 times larger.

Conversely, the carrier area accounts for about 90% of the total wobble to ensure stable operation of the clock. At the same time, if the memory synchronization area is further increased, it can be said that the limit is about 10%, so it is set to be less than or equal to 10 groups.

Of course, it must be a pattern in which the synchronization area is short, has 1 to 2 wobbles, and does not greatly affect the operation of the clock generation circuit. The division of data in information such as the general address of the synchronization area is several tens of bits.

The synchronization wobble 16 of the synchronization area 15 preceding the address area (AD area) 11 shown in FIG. 'Perform phase modulation of 4 cycles of carrier wobble 14.

Then, the recording medium of the nineteenth embodiment is formed on the track: the carrier area, which is continuously oscillated by the carrier wobble of a specific carrier period; having 4 times as long as a specific carrier cycle; and an address area which is 2 times as long as a specific carrier cycle and which is assigned data 0 and data 1 corresponding to information stored by wobbling The synchronization area is arranged before or near the address area.

In the recording medium of the twentieth embodiment, the number of wobbles between the synchronization cycle areas is set to 60 or more based on the carrier.

The recording medium of the 21st embodiment is formed on the track: the carrier region continuously oscillates through the carrier wobble of a specific carrier cycle; 4 times as long as the carrier period of the specified carrier period; and an address area, including a period twice as long as a specific carrier period and 2 times as long, and data 0 and data 1 corresponding to the information stored by wobbling set relative occurrence positions At a position that is twice the carrier period, a special wave swing with a phase difference of 180 degrees is assigned to it, and has a length of 4 times the specific carrier period, and the synchronization is configured in the previous or near the address area. area.

19 to 21 are explanatory diagrams showing specific examples of wobble modulation in the recording media of the nineteenth to twenty-first embodiments. In particular, FIG. 20 is an explanatory diagram showing a specific example of wobble modulation in the recording medium of the nineteenth embodiment, and FIG. 21 is an explanatory diagram showing a specific example of wobble modulation in the recording medium of the twenty-first embodiment.

As shown in FIG. 19(a), a part of the carrier area (#4, #5) is inserted between the synchronization area (#0 to #3) and the address area (#6, #7). The case where this synchronization area is independently arranged is called block synchronization (BlockSync), and as shown in FIG. 19( b ), this synchronization uses wobble to perform phase modulation with a length of 4 cycles of carrier wobble.

In addition, the synchronization wobble of the synchronization area arranged near the address area is as long as one cycle of the carrier wobble, and a special wave wobble with a cycle twice the carrier wobble is used in the address area, and data 0 is allocated as shown in Figure 19(c) As shown in the wobble, data 1 is assigned the wobble shown in FIG. 19(d).

In FIG. 20 and FIG. 21, the format of the case where there is no carrier area between the synchronization area and the address area is shown.

As shown in FIG. 20(a), the synchronization area (#0 to #3) is adjacent to the address area (#4, #5), and a part of the carrier area (#4, #5) is inserted. The block synchronization (BlockSync) of this sync area is the same as that in FIG. 19(b). In addition, the synchronization wobble in the synchronization area is a carrier wobble that is set as long as one cycle of the carrier wobble, and a special wave wobble with twice the cycle of the carrier is used in the address area, and the data 0 is allocated as shown in FIG. 20(c). As for the wobble, data 1 is assigned a wobble as shown in FIG. 20(d). In addition, as shown in FIG. 21, #4 to #7 are assigned to the address area, and for data 0, as shown in FIG. 21(c), special wave swings are assigned to #4 and #5. As shown in d), it is also possible to assign a special wave oscillating phase different from the special wave oscillating phase to #6 and #7.

Furthermore, in the recording medium of the twenty-second embodiment, the number of wobbles between the synchronization areas is set to 80 or more based on the carrier wobble.

Furthermore, in the recording medium of the 23rd embodiment, the synchronization wobble of the synchronization area is set to be 1 cycle long and 4 cycle long of the cycle of the carrier wobble, and the wobble is arranged immediately before or near the address area. The wobble for synchronization in the synchronization area is set to be as long as one cycle of the cycle of the carrier wobble, and is set to be as long as four cycles of the cycle of the carrier wobble.

Next, the operation of the wobble information detection circuit of the 30th to 35th embodiments and the processing of the wobble information detection methods of the 25th to 29th embodiments in the wobble information detection circuit will be described.

Fig. 22 is a block diagram showing the configuration of the wobble information detection circuits of the 30th to 35th embodiments.

23 is a waveform diagram showing output waveforms of each circuit in the case of reproducing the recording medium in the wobble format of Type 1 shown in FIG. 12 in the wobble information detection circuit shown in FIG. 22 .

In the wobble information detection method of the twenty-fifth embodiment, in the wobble information detection circuit shown in FIG. 22 , the carrier wobble is extracted from the carrier region of the recording medium in the first to fourteenth embodiments and embodiments described later. the carrier wave processing step of the frequency component of the frequency component; the special wave processing step of extracting the phase information component of the special wave wobble from the address area of the recording medium; and based on the frequency component extracted by the carrier wave processing step, from the special wave processing step An information detection step for detecting information stored by the wobble in the phase information component extracted by the step.

In the wobble information detection method of the twenty-sixth embodiment, in the wobble information detection circuit shown in FIG. 22, the carrier wobble is extracted from the carrier region of the recording medium in the eighth embodiment to the fourteenth embodiment and the embodiments described later. The carrier wave processing step of the frequency component; the special wave processing step of extracting the phase information component of the special wave wobble from the address area of the recording medium; the synchronization processing of extracting the phase information component of the wobble for synchronization from the synchronization area of the recording medium steps; and an information detecting step of detecting information stored by phase information components respectively extracted from said special wave processing step and said synchronization processing step based on frequency components extracted by said carrier wave processing step.

In the wobble information detection method of the twenty-seventh embodiment, in the wobble information detection circuit shown in FIG. 22, the carrier wobble is extracted from the carrier region of the recording medium in the eighth embodiment to the fourteenth embodiment and the embodiments described later. The frequency component of the frequency component, and the carrier processing step of generating at least 2 times the specified carrier cycle clock; from the address area of the recording medium, extracting a special wave swing based on at least 2 times the specific carrier cycle clock a special wave processing order of the phase information component of the special wave processing order; and an information detection step of detecting information stored by the wobble from the phase information component extracted by the special wave processing order.

In the wobble information detection method of the twenty-eighth embodiment, in the wobble information detection circuit shown in FIG. 22, the carrier wobble is extracted from the carrier area of the recording medium in the eighth to fourteenth embodiments and the embodiments described later. The frequency component of the frequency component, and the carrier processing step of generating the clock of the specific carrier period and 2 times of the specific carrier period; from the address area of the recording medium, based on at least 2 times of the specific carrier period The special wave processing sequence of extracting the phase information component of the special wave wobble from the clock of the special wave; the synchronization processing step of extracting the phase information component of the wobble for synchronization based on the clock of the specific carrier cycle from the synchronization area of the recording medium; and based on An information detection step of detecting information stored by wobble from the phase information component extracted by the phase information component extracted by the synchronization processing step in the address area specifying the position.

In the wobble information detection method of the twenty-ninth embodiment, in the wobble information detection circuit shown in FIG. 22 , the first solution of detecting the phase or frequency of the wobble signal based on the clock of the specific carrier period in the address area is simultaneously executed. modulation, and a second demodulation based on the phase or frequency of the wobble signal detected by a clock that is 2 times the period of the specific carrier, and based on these two demodulation results to judge the data 0 and data 1 of the information stored by the wobble.

As shown in FIG. 22, a wobble cycle detection circuit 40 composed of a bandpass filter (BPF) 41 passing only the carrier component and a binarization circuit (COMP) 42 extracts the carrier component of the wobble signal. As the wobble period detection circuit, a wobble period detection circuit realizing the wobble period detection method of the twenty-fourth embodiment can also be used.

This carrier component signal is input to a clock generation circuit 50 mainly composed of a phase-locked loop circuit (PLL circuit) 51, high frequency and low frequency components are removed, and an fw signal (first clock signal) that tracks the wobble frequency of the carrier component is generated, A fw/2 signal (second clock signal) having a frequency (double cycle) of 1/2 of the fw signal is generated by the 1/2 frequency generating circuit 52 .

The wobble signal is ideally a signal with a constant period, but due to jitter (temporal vibration caused by noise or rotation fluctuation of the recording medium), the period of the carrier component changes subtly. This is passed through the clock generating circuit 50 to remove high-frequency components, and is made to track the variation of the linear velocity.

On the other hand, the wobble signal is sent to the synchronization signal detection circuit 60 and the address signal detection circuit 70 after the low-frequency noise in the wobble signal is removed by the high-pass filter (HPF) 70 .

The synchronization signal detection circuit 60 mainly detects a modulation section of a cycle of carrier wobbles such as carrier wobbles included in the carrier field and synchronization wobbles included in the synchronization field.

It can also be used for demodulation of the part of the carrier cycle contained in the address field.

In addition, the address signal detection circuit 70 mainly detects a modulator twice the carrier period, such as a special wave wobble in the address area, and does not use only address information.

For example, if the fourth wobble in the fourth region described later is twice the period of the carrier, it can also be detected. It can also be detected if the synchronization wobble of the synchronization period is twice the period of the carrier wobble. In addition, when the wobble of the special wave is twice the cycle of the carrier wobble, the clock generation circuit 50 generates a clock signal with a cycle twice the carrier wobble, but in the case of other integer multiples, the clock signal of the integer multiple is generated. clock signal and set as the second clock signal.

In addition, the clock generating circuit 50 may have a function of discriminating and adjusting the phase and polarity of the second clock signal, or may be separately mounted.

When additionally mounted, the polarity discriminating circuit shown in FIG. 22 discriminates the phase of the second clock signal based on the demodulation result of the synchronization signal or the fourth wobble. Based on this result, the polarity or phase of the output of the second clock signal from the clock generation circuit 50 is adjusted, or the processing polarity is adjusted in accordance with the address information processing (not shown) at the subsequent stage.

In the synchronization signal detection circuit 60, unnecessary high-frequency noise is removed by a low-pass filter (LPF) 61, and at the same time, a SIN wave signal (fw signal) of the same cycle is generated in the SIN circuit 62 based on the first clock signal, and is generated by The multiplier 63 multiplies the output signal from the LPF 61 and the SIN wave signal (fw). (f) of FIG. 23 shows the signal waveform.

23( a ) to 23 ( g ) show waveforms of each part when demodulation is performed by the synchronization signal detection circuit from the SIN wave signal (fw) of the wobbled carrier period.

The wobble number shown in Fig. 23(a) written as #x is the number whose wobble is the 0th number per carrier cycle in terms of description, and the expected wobble number in Fig. 23(h) considers demodulation The delay of the circuit is a number counted by setting the position where the front end wobble of the synchronization area should be detected as the 0th.

In addition, a thick line indicates a frequency or phase modulation unit, and in the address area, a solid line indicates Data_0, and a dotted line indicates Data_1.

When explaining the flow of signals, the multiplication result of the wobble signal and the SIN wave signal (fw) is integrated by the integrator (∫) 64 every carrier period, and the integrated result is sampled by the sample-and-hold circuit (S/H) 65 , to keep the time of the carrier cycle.

In this case, the output of S/H65 is a synchronous signal when it is on the - side. In the second wobble of 2 times the period, the integration result is 0.

The reset signal (Reset) of the integrator 63 and the sampling signal (Sample) of the S/H65 operate at the timing indicated by ○ in the output signal of the S/H65 (see FIG. 23(f)). These are generally generated in the clock generation circuit 50 , but the timing may be processed in the address position signal generation circuit 81 at a time. In #0 of the wobble signal, there is a phase inversion portion of the synchronization portion, so based on the synchronization signal, in the address position signal generating circuit 81, an address position signal for a specific position is output to #6 and #7 where wobble generation for synchronization occurs. .

On the other hand, the address signal detection circuit 70 also performs substantially the same operation as that of the synchronization signal detection circuit 60 .

However, the cycle of the SIN wave is the cycle of the second clock signal. The explanation of the waveform here is as shown in Fig. 23(h) to Fig. 23(1).

In this case, in the wobble position, there are special wave wobbles of twice the cycle of address information at #6 and #7, and the output signal of S/H75 also changes with a delay of one cycle of the carrier wave. The phase of the wobble becomes positive or negative, indicating that it can be detected. Since 0 is detected in the carrier wobble or the synchronization wobble of the period of the carrier wobble, when the position of the special wave wobble of the position signal is not identified, not only positive or negative but also 0 is required to be discriminated. There is no problem in an unrecorded area with good signal quality, but it is not good for discrimination in a recorded area with a lot of noise components. Therefore, it is preferable to use the position signal to perform positive or negative judgment of the position where the special wave wobble exists.

The wobble information detection circuit shown in FIG. 22 is a demodulation circuit using a synchronous detection method, but it may be realized by a delay detection method known in the communication field.

In addition, in the above description, the method of multiplying the SIN wave signal analogously has been described, but instead of the SIN wave, the multiplication may be performed using rectangular waves of 1 and -1. In addition, it is also possible to digitize the wobble signal by an analog-to-digital converter, and use data stored in ROM, etc. to process the generation of the SIN wave. Preferably, the quantization speed at this time is greater than or equal to 8 times the swing period, and the resolution is greater than or equal to 5 bits.

FIG. 31 is a block diagram conceptualizing the wobble information detection circuit shown in FIG. 22 .

Special wave processing by the carrier wave processing system 110 having the combined functions of the wobble cycle detecting circuit 40 and the clock generating circuit 50 of FIG. The system 112 performs functions respectively to extract an information signal from the wobble signal and to reproduce information stored in the wobble of the recording medium. The synchronization processing system 11 does not have to use the reference signal obtained by the carrier processing system 110 to perform data detection by the special wave processing system 112, and may also use the function of the synchronization processing system 11 by processing the data.

In the waveform shown in FIG. 23, the general phase demodulation method is also described. When demodulating with the first clock signal (fw signal) of the carrier cycle, the phase and frequency of the carrier component can be detected. However, this is only the case where the crosstalk of the carrier component is also detected. Since most of the crosstalk is the carrier component, the wobble signals mutually amplify or weaken each other due to being in-phase or anti-phase with the wobble phase of the target track, but this is reflected as a deviation in the demodulation result. Looking at the waveform demodulated by the second clock signal (fw/2 signal) twice the period of one carrier, the demodulation result is 0 for the swing of the carrier component regardless of its phase. That is, the crosstalk of the carrier component does not affect the demodulation of the second clock signal.

It is proved mathematically as follows.

Set the wobble waveform to f(T). These conditions are considered as the following four.

(I)f(T)=sin(2T): The swing of the carrier cycle

(II) f(T)=sin(2T)±0.2*sin(2T): carrier cycle swing + crosstalk (carrier component)

(III) f(T)=sin(T): 2 times the swing of the carrier period

(IV) f(T)=sin(T)±0.2*sin(2T): 2 times the swing of the carrier period + crosstalk (carrier component)

For these waveforms, integrate after multiplying by sin(2T) in the case of demodulation of the carrier periodic component (I, II), and multiply by sin in the case of demodulation of the carrier periodic component (III, IV). (T) and then integrated, so that the demodulation results can be obtained respectively. During the integration period, both are 0 to 2π, which is 2 cycles of the carrier, that is, 1 cycle of the second swing.

By comparing the results of (I) and (II) and (III) and (IV), differences in the presence or absence of crosstalk were investigated.

In the demodulation of (I), when 2T=x is used using the variable substitution method, T=x/2, dt=dx/2, and the following formulas 1 and 2 are obtained.

[Equation 1]

∫ _(0→2π) f(T)*sin(2T)dT

＝∫ _(0→2π) sin^2(2T)dT

＝1/2*∫ _(0→4π) sin^2(x)dx

[Equation 2]

∫ _(0→4π) sin^2(x)dx

＝[-sin(x)*cos(x)] _(0→4π) +∫ _(0→4π) cos^2(x)dx

＝[-sin(2x)] _(0→4π) +∫ _(0→4π) (1-sin^2(x))dx

＝∫ _(0→4π) dx-∫ _(0→4π) sin^2(x)dx

The next formula 3 is obtained by formula 1 and formula 2. That is formula 4. Thus, formula 5 is obtained.

[Equation 3]

∫ _(0→4π) sin^2(x)dx＝2π

[Equation 4]

∫ _(0→2π) sin^2(2T)dT＝π

[Equation 5]

∫ _(0→2π) f(T)*sin(2T)dT=π

In the case of the demodulation of (II), Formula 7 is obtained from the next Formula 6 and the above Formula 4.

[Equation 6]

∫ _(0→2π) f(T)*sin(2T)dT

＝∫ _(0→2π) ((sin(2T)±0.2*sin(2T))*sin(2T))dT

＝∫ _(0→2π) sin^2(2T)dT±0.2*∫ _(0→2π) sin^2(2T)dT

[Equation 7]

∫ _(0→2π) f(T)*sin(2T)dT＝π±0.2π

Comparing the demodulation results of (I) and (II), it can be seen that the influence of the crosstalk of the carrier wobble component appears in the demodulation result.

On the other hand, the demodulation of the double period of the carrier wobble is as follows.

In the demodulation of (III), the following formula 8 is obtained. In addition, Expression 9 is obtained from the calculation process of Expression 3 above. Thus, Expression 10 is obtained.

[Equation 8]

∫ _(0→2π) f(T)*sin(2T)dT

＝∫ _(0→2π) sin^(2T)dT

[Equation 9]

∫ _(0→2π) sin^(2T)dT=π

[Equation 10]

∫ _(0→2π) f(T)*sin(2T)dT=π

In the demodulation of (IV), the following formula 11 is obtained. In addition, Expression 12 is obtained from Expression 9 above. In addition, Expression 13 is obtained. Thus, Expression 14 is obtained. Then, Expression 15 is obtained from Expression 12 and Expression 14.

[Equation 11]

∫ _(0→2π) f(T)*sin(T)dT

＝∫ _(0→2π) ((sin(T)±0.2*sin(2T))*sin(T))dT

＝∫ _(0→2π) sin^2(T)dT±0.2*∫ _(0→2π) sin^2(T)*sin(T)dT

[Equation 12]

∫ _(0→2π) sin^(T)dT=π

[Equation 13]

∫ _(0→2π) sin(2T)*sin(T)dT

＝2*∫ _(0→2π) sin^2(T)*cos(T)dT

＝2*[sin^2(T)*sin(T)] _(0→2π) -4*∫ _(0→2π) sin^2(T)*cos(T)dT

[Equation 14]

∫ _(0→2π) sin(2T)*sin(T)dT＝0

[Equation 15]

∫ _(0→2π) f(T)*sin(T)dT＝π

Comparing the demodulation results of (III) and (IV), it can be seen that the results are the same and are not affected by crosstalk. Therefore, by storing information at twice the cycle of carrier wobble, information can be demodulated without being affected by amplitude fluctuations due to crosstalk.

As described above, in the address signal detection circuit 70, demodulation is performed using the SIN wave signal (fw/2 signal) generated from the second clock signal having a period twice the carrier wobble. The second clock signal must be synchronized with the first clock signal of the cycle of the carrier wave used in the synchronous signal detection circuit 60, but its phase can be either 0 degrees or 180 degrees.

FIG. 24 is a waveform diagram showing waveforms of output signals of each part when demodulation is performed using SIN wave signals under the conditions of phase 0° and phase 18° in the wobble information detection circuit shown in FIG. 22 .

24( d ) to 14( g ) show a phase of 0 degrees, and FIGS. 24( h ) to 24( k ) show the case of a phase of 180 degrees.

When comparing the two, the polarity of the waveform after the output signal of the multiplier is reversed. That is, the waveform polarity of the output signal from the integrator in the case of the phase 0 degrees shown in FIG. 24(f), and the waveform polarity of the output signal from the integrator in the case of the phase 180 degrees shown in FIG. 24(i) Inversion, the S/H output signal as a demodulation result is in the case of the phase 0 degrees shown in FIG. 24 (g) and the phase 180 degrees shown in FIG. 24 (k), the polarity of the waveform is also reversed. change.

In this way, the polarity of the demodulation result is changed according to the synchronization state of the first clock signal and the second clock signal, that is, the SIN wave signal (fw signal) and the SIN wave signal (fw/2 signal).

Since the output signal from S/H is 0 outside the double-period part of the address area, polarity inversion cannot be judged only by the output signal of the address information detection circuit. Therefore, the phase states of the SIN wave signal (fw signal) and the SIN wave signal (fw/2 signal) must be kept in a certain predetermined state. This certain predetermined state means, for example, that the start of wobble #0 can be synchronized with the rising or falling edge of the second clock signal, that is, the SIN wave signal (fw/2 signal), or that the start of wobble #0 can be , the rising edge and falling edge change alternately each time (repeated (toggle) state).

Next, the recording media of the fifteenth and sixteenth embodiments will be described.

Fig. 25 is an explanatory diagram of the format of the recording medium of the fifteenth embodiment and the sixteenth embodiment.

25(a) to 25(c) show the arrangement positions and detection waveforms of wobbles when the number of wobbles between address areas is an odd number of carrier wobbles.

25(d) to 25(f) show the arrangement positions and detection waveforms of wobbles when the number of wobbles between address areas is an even number of carrier wobbles.

In the recording medium of the fifteenth embodiment, the number of wobbles between address areas is specified as an even number based on the carrier wobble, so that the second clock signal, that is, the SIN wave signal (fw/2 signal) is constant in wobble #0. Phase is fixed.

As shown in FIG. 25(d), when the number of wobbles between address areas is an even number, as shown in FIG. 25(f), the same SIN wave signal (fw/2 signal) phase (a1, a2, a3 shown by the arrows in the figure), so the polarity of the wobble information signal is also determined to be unique.

On the other hand, in the recording medium of the sixteenth embodiment, the number of wobbles between address areas is specified as an odd number based on the carrier wobble, and the polarity of information stored in the address areas is alternated in each consecutive address area. to reverse the record.

As shown in FIG. 25(a), when the number of wobbles between address regions is an odd number, as shown in FIG. 25(c), every time wobble #0 comes, the SIN generated based on the second clock signal The phase inversion of wave signal (fw/2 signal) (shown by arrows b1, b2, b3 in the figure).

When demodulating in this state, the polarity of the detected address demodulation data changes alternately, and the demodulation data bit (Bit) must be inverted every other data in the signal processing circuit of the subsequent stage to restore the memory Information in swing. Alternatively, the SIN wave signal (fw/2 signal) may be inverted for each address area.

However, complex processing is required at the time of demodulation anyway. Therefore, it is preferable that the data stored on the recording medium is divided into the wobble information sequence in units of the number of information bits (Bit) that can be stored in one address area in advance, and that every other divided data 1 is bit-inverted. Thus, since the number of wobbles between address areas is an odd number, there is no problem even if the polarity of the SIN wave signal (fw/2 signal) is inverted for each address area.

Furthermore, in the recording medium of the seventeenth embodiment, the number of wobbles between the synchronization areas is set to 10 times or more the sum of the length of the address area and the length of the synchronization area based on the carrier wobble.

In the demodulation of this embodiment, the phases of the SIN wave signal (fw signal) and the SIN wave signal (fw/2 signal) should be frequently checked for early detection of wobble shift regardless of the number of wobbles between address areas.

This is because, as described above, the output signal of the address information detection circuit is 0 outside the address area, so the polarity cannot be determined.

Fig. 26 is a diagram for explaining the simplest method of checking the phase state in the wobble information detection circuits of the thirty-second embodiment and the thirty-third embodiment.

The synchronization signal (output signal of S/H) is detected using the synchronization signal detection circuit 60 . If the level of the binarized signal of the SIN wave signal (fw/2 signal) is detected at the timing of the synchronization signal, the phase of the SIN wave signal (fw/2 signal) in wobble #0 can be detected.

Of course, if the phase relationship between the SIN wave signal (fw/2) and the second clock signal is determined, the second clock signal may be used instead of the binarized signal.

Since the positional relationship between the synchronization area and the address area is determined in terms of the format, the same polarity check can be performed around the address area delayed by several wobbles based on the timing of the synchronization signal.

Ideally, the polarity check of the SIN wave signal (fw/2 signal) described above is maintained once when the demodulation is started, so it is not necessary to check every time in the synchronization area.

However, in actual operation, due to disturbances such as scratches on the recording medium, the synchronous state of the wobble and the clock may be broken for a short time, and the number of wobbles between address areas may deviate. This is called a wobble shift, and when this wobble shift occurs, the phase relationship between the SIN wave signal (fw signal) and the SIN wave signal (fw/2 signal) deviates. Thus, the polarity should be checked each time in each synchronization area.

Next, in the recording medium of the eighteenth embodiment, in the fourth area at a position separated from the wobble cycle with respect to the synchronization area, twice the cycle of the carrier wobble whose phase and position are fixed regardless of the information stored by the wobble is arranged. period, and a fourth swing that is twice as long.

That is, a wobble portion of twice the period of a carrier wave whose phase and position are fixed regardless of the data of the wobble information is arranged.

Fig. 27 is a waveform diagram showing an example of the wobble shape of the format of the recording medium in the eighteenth embodiment.

Type (Type) A shown in FIG. 27(c) is arranged in front of the special wave wobble 12 having a period twice the carrier wobble of #6 and #7 in the address area, and the connection configuration has nothing to do with the wobble information. A portion 12' of a special wave oscillation 12 with twice the period of the carrier oscillation.

For Type B shown in Fig. 27(d), a synchronization wobble 16 with one cycle of carrier wobble placed in #0 in the synchronization area is connected to a cycle twice the carrier wobble regardless of the wobble information. Part 12' of the special wave swing 12'.

Type (Type) 1 shown in FIG. 27(b) is shown in FIG. 12 and is the swing shape used in the description.

In the method of checking the phase of the SIN wave signal (fw/2 signal) for each synchronization area, the occurrence of wobble shift can be detected in the case of 1 wobble shift, but if 2 wobble shift is compared The result is again correct and undetectable.

Therefore, by using the synchronization area as a reference, the position and phase of the wobble (special wave wobble) which is twice the period of the carrier wobble which has no relation to the wobble information are fixed at the same time, so that wobble can be judged even when wobble shift occurs. polarity of the information and can detect the correct swing information. As shown in type A and type B, the position of the additional 2 times period part is preferably in the vicinity of the synchronization area and the address area, and it is preferably as long as about 1 to 2 wobbles of the carrier wobble, so as not to affect the extraction of the carrier wobble component .

FIG. 28 is a waveform diagram showing signal waveforms when the wobble shape of type A in FIG. 27 is demodulated. The thick solid line in the figure is the case of data 0 (Data_0), and the thick line of dotted line is the case of data 1 (Data_1).

The swing numbers and expected swing numbers are the same as described. The demodulation of the SIN wave signal (fw signal) is the same as above except that the output signal of the S/H in the newly added double-period part is 0 level, and no further description will be made in particular.

28(h) to 28(d) show waveforms of output signals of various parts of the wobble information detection circuit in FIG. 22 when the phase of the SIN wave signal (fw/2 signal) is 0 degrees.

28(1) to 28(o) show waveforms of output signals of various parts of the wobble information detection circuit of FIG. 22 when the phase of the SIN wave signal (fw/2 signal) is 180 degrees.

Usually the phase is 0 degrees, but it is considered to be 180 degrees due to the wobble shift.

Originally, when the phase is 0 degrees, the S/H output signal in the address area becomes a signal level on the positive side as shown by the thick line in FIG. 25(k).

However, if the phase is 180 degrees, it becomes the opposite negative side level and the polarity is reversed, and the S/H output signal of the address area becomes the negative side signal level as shown by the thick line in Fig. 25(o). . In this case, if the inversion cannot be detected, it becomes false detection.

However, the demodulation result of the double-period part irrespective of the added wobble information, the signal level is determined to be the negative side when the phase is 0 degrees, and the signal level is determined to be the positive side when the phase is 180 degrees, so it shows a SIN wave Phase inversion of the signal (fw/2 signal).

Also, when two wobbles are shifted, the signal of the SIN wave signal (fw/2 signal) is 0 degrees, but the position of the expected wobble number and the wobble demodulation data deviates.

However, since a known data bit (a demodulation result of a double-period portion not related to the wobble information) is detected at the leading end of the demodulated data, it may be used as a trigger to demodulate the wobble information. Therefore, it is possible to detect the signal level of the double-period part irrelevant to the wobble information, and judge the polarity and position of the demodulation result of the wobble information part.

Fig. 29 is a block diagram showing the structure of an information recording and reproducing apparatus according to a thirty-sixth embodiment and a thirty-seventh embodiment of the present invention.

This information recording and reproducing apparatus is divided into an optical pickup 90 equipped with an optical system, a motor 100 for moving the optical pickup 90 and rotating the recording medium 107, and various circuits. The optical pickup 90 is equipped with a laser light source 91, an optical component for guiding the light beam generated by the laser light source 91 to each element, an objective lens 92 for converging the light spot of the light beam on the recording medium 107, and an objective lens 92 for tracking the light spot to a required position. On the other hand, an actuator 93 and a light receiving element 94 for controlling the position of the objective lens 92 .

In addition, the following parts are present in the circuit.

It has: a laser drive circuit 101, which determines the current and waveform for making the laser light source 91 emit light based on the recording information; an arithmetic circuit 102, which includes photoelectric conversion, wobble signals, RF signals, servo signal operation of the signal; and the RF processing circuit 103 detects reproduction information based on the RF signal. This reproduced information is sent to a demodulation circuit (not shown because it is well known) and converted into user data.

The wobble information detection circuit 104 corresponds to the above wobble information detection circuit, receives a wobble signal, and detects information stored in wobbles such as address information and a clock signal. The servo signal is subjected to various calculations by the servo signal detection circuit 105, the position information of the light spot is extracted by the servo processing circuit 106, and the motor 100, the optical pickup 90 or the actuator 93 is operated to make the light spot follow the required position.

FIG. 30 is an explanatory diagram of detection of a wobble signal from the light receiving element 94 of FIG. 29 to the arithmetic circuit 102 .

As shown in FIG. 30(b), the surface of the light receiving element is divided into at least two (regions 94a and 94b shown in A and B in the figure), and this dividing line 110 is parallel to the track 2 shown in FIG. 30(a). Then, the difference between the two output signals from the two light receiving elements A49a and B94b is calculated by the arithmetic circuit 102 to detect a wobble signal.

In the format of the recording medium of the embodiment of the present invention, a SIN wave signal (fw signal) for detecting the carrier period of the synchronization area (third area) and a SIN wave signal (fw signal) for detecting the carrier wave of the address area (second area) are used. A SIN wave signal (fw/2 signal) of 2 times the period (1/2 frequency) detects the synchronization signal and the information signal.

These SIN wave signals may be clock signals generated from carrier components obtained from wobble signals, or may be created based on the clock signals. In the case of synchronizing the double-period SIN wave signal (fw/2 signal) used for the detection of the address area with the wobble signal, it is considered that the double-period SIN wave signal (fw /2 signal) can have a phase of 0 degrees and 180 degrees. It has a characteristic that the polarity of the information (data) demodulated from the address area is determined by the phase state.

That is, if the phase states of the wobble signal and the double-period SIN wave signal (fw/2 signal) are kept in a predetermined state, the polarity of data cannot be determined, and accurate information detection cannot be performed. Therefore, in a normal state, the phases of the wobble signal and the double-period SIN wave signal (fw/2 signal) are kept in a predetermined state.

In addition, there may be cases where the wobble signal cannot be detected even for a short period of time due to small scratches on the recording medium or sudden large detection circuit noise.

In such a case, the number of wobble signals and the number of clock signals that should be detected within a certain period of time sometimes do not match.

For example, when the interval of the synchronization field is 60 wobbles, the clock signal is slightly earlier when the wobble cannot be detected, and the clock signal detected in the next synchronization field is the 59th time. A mismatch between the number of wobble signals and the number of clock signals that should be detected within such a certain period of time is called wobble shift.

Of course, when there is a large scratch on the recording medium, the tracking servo system and the like are separated from the original access position, so it is necessary to restart from the generation of the clock, so it is out of the scope of discussion. Therefore, in this embodiment, the tracking servo system is normal, and although the original track is continued to be accessed, it can be handled when the number of wobbles and the number of clocks are different. In addition, the synchronization signal inserted in each information segment is also defined.

According to the recording medium, the wobble period detection method, the wobble information detection method, the wobble information detection circuit, and the information recording and reproducing device of the present embodiment, as a wobble format that ensures a high S/N ratio and high positional accuracy of the information demodulation signal, Not only the normal state, but also the wobble shift can be easily restored and stable information detection can be performed.

Thus, according to the recording medium of the first embodiment, information can be detected with high quality, and information can be restored with high reliability.

Furthermore, according to the recording medium of the second embodiment, since the demodulated signal with the highest signal S/N is obtained, it is possible to restore highly reliable information.

Furthermore, according to the recording medium of the third embodiment, information is included in the phase and the generation position, a demodulated signal of high quality is obtained, and information with high reliability can be restored. Furthermore, the amount of information can be increased without increasing the special wave swing component in the crosstalk.

Furthermore, according to the recording medium of the fourth embodiment, a demodulated signal with the highest signal S/N ratio can be obtained, so that highly reliable information can be restored.

Furthermore, according to the recording medium of the fifth embodiment, it is possible to clearly separate the frequency band from the recording information signal (higher frequency than the carrier wave) which is a noise component to the wobble signal, so that a good wobble signal can be detected. In addition, a clock signal used for demodulation can be easily obtained from the carrier component.

Furthermore, according to the recording medium of the sixth embodiment, the amount of information stored in the wobble can be ensured to be large, and at the same time, the frequency band separation from the recording information signal can be performed.

Furthermore, according to the recording medium of the seventh embodiment, the special wave wobble signal is always completed within one cycle unit, and since there is no DC component, the detection circuit becomes easy.

Furthermore, according to the recording medium of the eighth embodiment, new information, that is, synchronous information can be stored in the wobble by the wobble for synchronization without adversely affecting the reproduction of the recorded information.

Furthermore, according to the recording medium of the ninth embodiment, it is preferable to easily distinguish from the special wave wobble, and at the same time, the configuration of the detection circuit is substantially the same as that for the detection of the special wave wobble, and furthermore, there is no adverse effect on the detection of the special wave wobble.

Furthermore, according to the recording medium of the tenth embodiment, the position where the special wave wobbles can be accurately set, and high-quality and reliable information detection can be performed.

Furthermore, according to the recording medium of the eleventh embodiment, since the synchronous signal is pulled in at a long distance from the special wave wobble and is easily distinguished, it can be pulled in at a high speed. In addition, since the disturbed wobble period signal is restored in the interposed carrier region after the synchronization field passes, the clock signal generated from the wobble period signal can be stably maintained.

Furthermore, according to the recording medium of the twelfth embodiment, after the wobble period signal extracted by the bandpass filter is disturbed in the synchronization area, a sufficiently recovered carrier area is ensured, and a clock signal generated from the wobble period signal can be stably maintained.

Furthermore, according to the recording medium of the thirteenth embodiment, storage of information can be performed without greatly affecting the extraction of carrier components for clock generation. Furthermore, detection of wobble displacement can be performed frequently.

Furthermore, according to the recording medium of the fourteenth embodiment, the occurrence position of the special wave wobble can be easily identified, and the division of information can be easily found.

Furthermore, according to the recording medium of the fifteenth embodiment, the phase of the reference signal (second clock) used for demodulation is always fixed, and the polarity of the demodulated signal is uniquely determined.

In addition, according to the recording medium of the sixteenth embodiment, the phase of the reference signal (second clock) used for demodulation is shifted by 180 degrees for every second area, and the data on the recording medium (media) is processed in consideration of inversion of the demodulated data. The data does not require data processing such as inversion processing of the reference signal on the demodulation circuit, or data processing such as alternately inverting the demodulated data, and information detection can be easily performed.

Furthermore, according to the recording medium of the seventeenth embodiment, the rate of carrier cycle disturbance in the demodulation section can be sufficiently reduced, and a stable reference signal for demodulation can be obtained.

Furthermore, according to the recording medium of the eighteenth embodiment, even if a wobble shift of 2 wobbles or more occurs, correct demodulated data can be restored without misdetection of data due to wrong polarity.

Furthermore, according to the recording medium of the nineteenth embodiment, synchronous pull-in can be performed at high speed, and the reliability of information can be improved.

Furthermore, according to the recording medium of the twentieth embodiment, the stability of the demodulated reference signal (clock) can be ensured.

Furthermore, according to the recording medium of the twenty-first embodiment, synchronous pull-in can be performed at high speed, and the reliability of information can be improved.

Furthermore, according to the recording medium of the twenty-second embodiment, the stability of the demodulated reference signal (clock) can be ensured.

Furthermore, according to the recording medium of the twenty-third embodiment, the difference between the two kinds of wobbles for synchronization can be easily distinguished, and high-speed and accurate synchronization pull-in can be performed.

Furthermore, according to the wobble period detection method of the twenty-fourth embodiment, even in the region where the phase differs from the carrier by 180 degrees, the clock can be stably maintained without disturbing the wobble period signal. In addition, since the second area and the third area can be approached, the position of the second area will not be mistaken due to deviation of the wobble number due to interference or the like.

Furthermore, according to the wobble information detection method of the twenty-fifth embodiment, the information stored in the wobble of the recording medium of the first and second embodiments can be detected.

Furthermore, according to the wobble information detection method of the twenty-sixth embodiment, the information stored in the wobble of the recording medium of the third and fourth embodiments can be detected.

Furthermore, according to the wobble information detection method of the twenty-seventh embodiment, it is possible to detect information stored in the wobble of the recording medium of the above-mentioned embodiments.

Furthermore, according to the wobble information detection method of the twenty-eighth embodiment, it is possible to detect information stored in the wobble of the recording medium in the eighth embodiment or later.

Furthermore, according to the wobble information detecting method of the twenty-ninth embodiment, it is possible to detect high-quality and highly reliable wobble information from the recording media of the third and fourth embodiments.

Furthermore, according to the wobble information detecting circuit of the 30th embodiment, it is possible to detect the information stored in the wobble of the recording medium of each of the above-mentioned embodiments.

Furthermore, according to the wobble information detection circuit of the thirty-first embodiment, it is possible to detect information stored in the wobble of the recording medium in the eighth and subsequent embodiments.

Furthermore, according to the wobble information detection circuits of the 32nd and 34th embodiments, the phase and polarity of the reference signal of twice the period used for demodulation of the address area can be uniquely determined, and the demodulated data can be held for the required polarity.

Furthermore, according to the wobble information detection circuits of the thirty-third embodiment and the thirty-fifth embodiment, even when wobble shift occurs, correct demodulated data can be restored without wrongly detecting data due to wrong polarity.

Furthermore, according to the information recording and reproducing apparatus of the thirty-sixth embodiment, good demodulation of wobble information can be performed, and stable access performance can be obtained due to high reliability of address information and the like.

Furthermore, according to the information recording and reproducing apparatus of the thirty-seventh embodiment, high-quality wobble information and smooth synchronous pull-in to the recording medium can be performed, so high-speed, high-density, stable recording and reproduction can be performed on the recording medium.

The industrial applicability of the present invention lies in that the recording medium of the present invention can be applied to recording media other than the optical disc. In addition, the wobble period detection method, wobble information detection method, wobble information detection circuit, and information recording and reproducing apparatus of the present invention can also be applied to personal computers such as desktop personal computers and notebook personal computers.

Claims (15)

1. A method for detecting wobble information, which is used for the following recording medium: the track as the guide groove is divided into: a carrier region, which continuously wobbles through the first wobble groove of a specific carrier period; and an address region, which has a second wobble groove, The second wobble slot has an integer multiple of the carrier cycle and a cycle different from that of the first wobble slot, and the second wobble slot is determined corresponding to data 0 and data 1 of information stored by the wobble slot phase, the second wobbled groove and the occurrence position of the second wobbled groove are wobbled by the information, It is characterized in that the swing information detection method includes: a carrier wave processing step of extracting a frequency component of a first wobble groove from a carrier region of said recording medium; a special wave processing step of extracting a phase information component of a second wobble groove from an address region of said recording medium; and an information detection step , detecting information stored by wobbling the groove from the phase information component extracted by the special wave processing step based on the fractional-integer frequency component extracted by the carrier wave processing step. 2. The method for detecting wobble information according to claim 1, wherein the period of the second wobble slot is twice the period of the carrier. 3. The method for detecting wobble information according to claim 1, wherein the number of wobble slots between the address areas is an even number based on the carrier. 4. The wobble information detection method according to claim 1, wherein the number of wobble slots between the address areas is an odd number based on the carrier wave, and the polarity of the information stored in the address areas is between each consecutive address. The area is alternately reversed and recorded. 5. The method for detecting wobble information according to claim 2, wherein the length of the second wobble slot is twice the period of the carrier wave. 6. The wobble information detection method according to claim 1, wherein a synchronous area is formed on the track of the guide groove of the recording medium, including a third wobble that can be distinguished from the first wobble groove and the second wobble groove. groove. 7. The wobble information detection method according to claim 6, wherein the third wobble groove has a carrier cycle and has a shape 180 degrees out of phase with the first wobble groove. 8. The method for detecting wobble information according to claim 6, wherein the synchronization area is arranged before the address area. 9. The method for detecting wobble information according to claim 6, wherein the carrier region is configured before the synchronization region. 10. The wobble information detection method according to claim 9, characterized in that the length of the carrier region arranged before the synchronization region is greater than or equal to 5 times the carrier period. 11. The method for detecting wobble information according to claim 6, wherein the synchronization areas are arranged at regular intervals, and the address areas are arranged intermittently and close to the synchronization areas. 12. The method for detecting wobble information according to claim 11, wherein the length of the third wobble groove in the synchronization area located near the address area is the same as the length of the third wobble groove in the synchronization area separately from the address area. The swing slots are of different lengths. 13. The wobble information detection method according to claim 6, wherein the number of wobble slots between the synchronization areas is greater than or equal to 10 times the sum of the length of the address area and the length of the synchronization area based on the carrier. 14. The wobble information detection method according to claim 6, wherein in the fourth area at a position away from the synchronization area by a predetermined carrier period, there are arranged, The fourth wobble groove having a period twice as long as the carrier period and a length twice as long as the phase and the generation position are fixed. 15. A wobble information detection method for the following recording medium: the track as the guide groove is divided into: a carrier region, which continuously wobbles through the first wobble groove of a specific carrier period; and an address region, which has a second wobble groove, The second wobble slot has an integer multiple of the carrier cycle and a cycle different from that of the first wobble slot, and the second wobble slot is determined corresponding to data 0 and data 1 of information stored by the wobble slot phase, the second wobbled groove and the occurrence position of the second wobbled groove are wobbled by the information, It is characterized in that the swing information detection method includes: The carrier wave processing step extracts the frequency component of the first wobble groove from the carrier region of the recording medium, and generates a clock that is at least twice the period of the specific carrier wave; the special wave processing step extracts the frequency component of the first wobble groove from the address of the recording medium extracting a phase information component of the second wobbled groove based on a clock at least twice the specified carrier period in the region; and an information detecting step of detecting the phase information component stored through the wobbled groove from the phase information component extracted by the special wave processing step Information.

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