JP2004164758A - Optical disk exclusive for reproducing, reproducing device, reproducing method, reproducing program, and recording medium recorded with the program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk such as a DVD capable of recording BCA data by a phase pit and reading the BCA data appropriately. <P>SOLUTION: The DVD 100 has a BCA region 103 in which control information is recorded inside of a read-in region 104, length of a rotation direction being equal to a stripe shape of the BCA of control data being the BCA data recorded in the BCA region is recorded by arranging phase pits being same as single phase pits or multi-pits in a plurality of tracks. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording format of information recorded on an optical disc.
[0002]
[Prior art]
In recent years, a so-called DVD (Digital Versatile Disc) has been widely used as a disc-shaped information recording medium on which high-density information can be recorded.
[0003]
Usually, an optical disc such as a DVD records control information for controlling reproduction of the content information in addition to content information such as music and video. Such an optical disc records control information. It has a dedicated area.
[0004]
Conventionally, such a reproduction control area includes innermost peripherals such as codes indicating standards and versions supported by the optical disk, physical information of the disk, the final address of the data area, and copyright protection technology in the data. It has an area for recording data to provide each information when reading data recorded on the optical disk without performing tracking, and the data is phase-encoded into a typical format of this area. (Phase Encoded) and a format for recording in pits, and a format for converting data into a barcode and recording.
[0005]
The former method of phase encoding the data and recording the data in pits is generally used for a read-only optical disk that records data using phase pits. Is referred to as a PEP (Phase Encoded Part) region.
[0006]
On the other hand, the latter format in which the data is converted into a barcode and the area is recorded on a stripe is generally a phase-change disk in which data is recorded as a difference in reflectance between a crystalline state and an amorphous state. It is used for a rewritable optical disk composed of a recording film that can be rewritten a number of times, and an area recorded according to the recording format is referred to as a BCA (Burst Cutting Area) area (for example, see Patent Document 1). ).
[Patent Document 1]
JP 2001-243634 A
[0007]
[Problems to be solved by the invention]
However, when a reproduction-only optical disk having a PEP area and a rewritable optical disk having a BCA area are reproduced by one reproduction apparatus, the reproduction processing for each recording format is different. It was necessary to have a corresponding regeneration mechanism.
[0008]
The present invention has been made in view of the above-described problems, and as an example of the problem, BCA data is recorded by phase pits, and the BCA data can be accurately read. An object of the present invention is to provide an optical disk such as a reproducible DVD.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the content information area in which the content information is recorded and the control information for controlling the reproduction of the content information are arranged such that the phase pit is rotated in each track in the rotation direction And a control information area recorded by arranging the band-like phase pits of each track in the same radial direction in any of the optical discs. Has a configuration in which each bit is formed by at least one of the number of pits in the rotation direction of the phase pit or the pit width of each pit and the arrangement of the phase pits in the radial direction, and the control information is recorded. I have.
[0010]
According to a fourth aspect of the present invention, the content information area in which the content information is recorded and the control information for controlling the reproduction of the content information form a phase pit for each track in a belt shape in the rotation direction. A control information area recorded by arranging strip-shaped phase pits for each track in the same direction in any radial direction of the optical disc; and in the control information area, each bit has the phase. A reproducing apparatus for reproducing an optical recording medium on which the control information is formed by forming at least one of the number of pits in the rotation direction of the pits or the pit width of each pit and the arrangement of the phase pits in the radial direction, Reading means for reading each pit data from the optical recording disk based on the reflectance of the phase pit; Process carried out, it has a data processing means for obtaining bid data, a generation unit that generates the control information based on the obtained bit data, the configuration with.
[0011]
Further, in the invention according to claim 7, the content information area in which the content information is recorded and the control information for controlling the reproduction of the content information form a phase pit for each track in a belt shape in the rotation direction. A control information area recorded by arranging strip-shaped phase pits for each track in the same direction in any radial direction of the optical disc; and in the control information area, each bit has the phase. A reproduction method for reproducing an optical recording medium on which the control information is formed by forming at least one of the number of pits in the rotation direction of the pits or the pit width of each pit and the arrangement of the phase pits in the radial direction, A reading step of reading each pit data from the optical recording disk based on the reflectance of the phase pit; Process carried out, it has a data processing step of obtaining bid data, a generation step of generating the control information based on the obtained bit data, a structure including the.
[0012]
Further, according to a tenth aspect of the present invention, the content information area in which the content information is recorded and the control information for controlling the reproduction of the content information form a phase pit for each track in a belt shape in the rotation direction. A control information area recorded by arranging strip-shaped phase pits for each track in the same direction in any radial direction of the optical disc; and in the control information area, each bit has the phase. A reproduction program for reproducing, by a computer, an optical recording medium formed by at least one of the number of pits in the rotation direction of pits or the pit width of each pit and the arrangement of the phase pits in the radial direction and recording the control information. Reading the respective pit data from the optical recording disk based on the reflectivity of the phase pits. An output unit, a data processing unit that performs a binarization process on each of the read pit data to obtain bid data, and a generation unit that generates the control information based on the obtained bit data. have.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a preferred embodiment of the present invention will be described with reference to the drawings.
[0014]
The embodiment described below is an embodiment in which the present invention is applied to a DVD which is an optical disc and a reproducing apparatus therefor.
[0015]
(I) BCA area
First, before describing a specific embodiment, a BCA area which is a premise of the embodiment of the present application will be described with reference to FIG.
[0016]
The following BCA area will be described using a DVD-RW that is a rewriting DVD.
[0017]
FIG. 1 is a diagram for explaining the correspondence between the reproduction signal recorded in the BCA area and the BCA data.
[0018]
As described above, the BCA area is generally used for a rewritable optical disk including a recording film that can be rewritten a number of times, such as a phase-change disk that performs data recording as a difference in reflectance between a crystalline state and an amorphous state. The data to be recorded in the BCA area is converted into barcode data, and the data is recorded so that the area is on a stripe.
[0019]
For example, as shown in FIG. 1A, the BCA area irradiates a laser for recording data based on a modulation signal modulated according to specific identification information in a pulse shape in accordance with the pattern shape of the BCA data. As shown in FIG. 1B, data is recorded by collectively destroying and removing the reflective film of the optical disk in a stripe shape, and as shown in FIG. With the remaining portion, stripe-shaped BCA data is formed.
[0020]
When the optical disk having the stripe-shaped BCA data pattern is reproduced by the optical head of the optical information recording / reproducing apparatus 200, the reflection film has disappeared in the BCA data, so that as shown in FIG. The modulated signal has a waveform that is intermittently missing, and as shown in FIG. 1E, by applying a filtering process to the missing portion of this waveform, the reproduction information as shown in FIG. 1F is detected. Information recorded on an optical recording medium can be obtained.
[0021]
The BCA area is provided at the innermost periphery of the DVD, similarly to the PEP area described above, and control information relating to reproduction control of content information such as tracking control, read power, and discrimination of tracks (land or group) is included in the BCA area. It is to be recorded.
[0022]
By thus forming the BCA area and leaving the film structure at the time of sputtering, the control information recorded in the BCA area can be retained without being erased even after initialization.
[0023]
(II) Embodiment of a read-only optical disk and its playback device
Next, an example of a read-only optical disk and a reproducing apparatus thereof according to the present invention, which are formulated based on the above-described recording areas, will be described with reference to FIGS.
[0024]
[Reproduction-only optical disk (DVD)]
First, the physical structure of a read-only optical disk (DVD) will be described with reference to FIG.
[0025]
The optical disc of the present embodiment has a BCA area, not a PEP area, formed in a control information area of a read-only DVD. Specifically, a plurality of phase pits formed in the rotation direction are formed. The bar code is formed by the arrangement of the phase pits in the radial direction.
[0026]
FIG. 2 is a diagram showing a physical structure of an optical disk (DVD) according to the embodiment of the present invention.
[0027]
As shown in FIG. 2, a read-only DVD (hereinafter, simply referred to as a DVD) 100 according to the present embodiment includes a clamp hole 101 for fixing the DVD 100 to a reproduction device described later, and a clamp hole 101 for fixing the DVD 100 from the inside. An unrecorded area 102, a BCA area 103 for recording control information as described above, a lead-in area 104 for recording control information different from the control information recorded in the BCA area 103, and content management information are recorded. It is composed of a recording area 105 and a lead-out area 106 in which various information for ending information recording or information reproduction is recorded.
[0028]
Note that, for example, the BCA area 103 of the present embodiment constitutes a control information area according to the present invention, and the recording area 105 of the present embodiment constitutes a content information area according to the present invention.
[0029]
The clamp hole 101 is for fixing the DVD 100 to a rotating shaft of a spindle motor (not shown) of the reproducing apparatus described later, and the unrecorded area 102 is for recording any data to fix the DVD 100. Not in the area.
[0030]
The BCA area 103 has a predetermined physical pit structure, which realizes a barcode format and records the above-described control information.
[0031]
The details of the physical pit structure of the BCA area 103 will be described later.
[0032]
The BCA area 103 is provided in a range of about 1.2 mm from the inside of the lead-in area 104. The BCA area 103 has a push-pull method, the reflection polarity when detecting a phase pit, and the like. In addition, tracking control information relating to tracking control such as a tracking method, disc information as various kinds of information of the DVD 100, and copyright information (copy protection information) of the DVD 100 itself are recorded.
[0033]
In the lead-in area 104, control information different from the control information recorded in the BCA area 103 is recorded. Specifically, the start and end addresses of the data of the content information and the DVD 100 Information such as content management information such as copyright information in the content information to be recorded is recorded.
[0034]
Information to be actually recorded, for example, content information (reproduction information) such as audio information and video information is recorded in the recording area 105.
[0035]
The copyright information includes, for example, the name of the copyright holder, copy control information indicating whether or not copying of each piece of content information to be recorded is prohibited, and so-called scramble processing performed on the recorded content information. This means usage rule information such as information for canceling the scramble processing at the time of execution.
[0036]
Next, the BCA area 103 of the present embodiment will be described with reference to FIGS.
[0037]
FIG. 3 is a diagram for explaining a physical structure when BCA data is formed by phase pits in the present embodiment, and FIG. 4 is a detailed diagram of a phase pit forming one BCA data.
[0038]
As described above, the BCA data needs to have a stripe shape, and it is necessary to form a low reflection in the relevant portion at the time of reproduction by burning off the reflective film.
[0039]
In the present embodiment, phase pits are recorded at track pitch (Track Pitch) intervals so as to have the stripe shape shown in FIG. 3, and BCA is performed by the phase pits in the rotation direction of the DVD 100 and the phase pits arranged in the radial direction. It has the same function as data.
[0040]
Specifically, as shown in FIG. 4, the length (7 μm to 17 μm) in the rotation direction equivalent to the stripe shape of the BCA data is a single phase pit or a plurality of phase pits (hereinafter, referred to as multi-pits). The radial length (about 1.2 mm) of the stripe shape of the BCA data is represented by arranging similar phase pits in a plurality of tracks.
[0041]
As described above, the BCA data is formed by the arrangement of the plurality of phase pits and the track pitch, and the reproduced signal shown in FIG. 4, that is, the bit data is configured.
[0042]
When the BCA data is reproduced using such phase pits, unlike the case where the BCA data is formed by the above-described reflective film, the BCA data does not have a signal level in the non-reflection light state. Reflection will occur.
[0043]
However, in the BCA data generated by the phase pits, reflected light does not occur from the mirror surface portion and the reflection is low, so if the apparatus configuration of the reproducing apparatus 200 described later is provided, the Reproduction can be performed by a reproduction circuit basically similar to the BCA data reproduction circuit.
[0044]
When the BCA data is formed by a single phase pit, the reproduced signal is a signal similar to the BCA data. Therefore, when the BCA data is formed by multi-pits, the reproduced signal is the same as the BCA data. I can't get a signal.
[0045]
However, since the average reflectance of the BCA data is lower than the reflectance of the mirror surface portion, the average reflectance of the portion is calculated by the filter 206 or the one-shot multivibrator, as described later, A similar reproduced signal is obtained based on the average reflectance.
[0046]
(Playback device)
Next, the reproducing apparatus according to the present embodiment will be described with reference to FIGS.
[0047]
In the present embodiment, the description will be made using the above-described DVD dedicated to reproduction and the DVD using a BCA area in which control information is recorded by multi-pits.
[0048]
FIG. 5 is a block diagram showing the configuration of the playback apparatus according to the present embodiment, and FIG. 6 is a view for explaining data processing by filter processing and binarization processing. FIG. 7 is a flowchart showing the operation of reading the control information.
[0049]
As shown in FIG. 5, the playback apparatus 200 includes a pickup 201 for the DVD 100 stored in the playback apparatus 200 to acquire pit data using a semiconductor laser, and an amplifier 202 for generating a playback signal based on the acquired pit data. And a demodulation unit 203 that performs a preset demodulation process on the reproduction signal to generate a demodulation signal, and obtains predetermined information from the demodulation signal and performs decoding described later to convert audio information and video information. A decoding unit 204 that decodes and obtains the information, a decoder 205 that converts the decoded audio information and video information into information of a predetermined format and outputs the information to the outside, and a filter 206 that cuts high-frequency components of the input pit data. , A slicer 207 for binarizing pit data from which high-frequency components have been cut, A BCA data decoder 208 that decodes the BCA data into BCA data, and a control unit 209 that performs overall control of the above components while transmitting and receiving necessary control information via a bus, and generates control information based on the BCA data. Have.
[0050]
Note that, for example, the pickup 201 of the present embodiment constitutes a reading unit according to the present invention, and the slicer 207 constitutes a data processing unit and a binarizing processing unit according to the present invention. Further, for example, the filter 206 of the present embodiment constitutes the data processing unit and the filter 206 according to the present invention, and the control unit 209 of the present embodiment constitutes the data processing unit and the obtaining unit according to the present invention.
[0051]
The pickup 201 emits a light beam having a constant intensity for reproduction, and receives reflected light with respect to the phase pit by a light receiving unit (not shown), and pit data (SUM) corresponding to a change in the intensity of the received reflected light. ) Is generated and output to the amplifier 202 and the filter 206.
[0052]
In the pickup 201, switching of the pit data to the amplifier 202 or the filter 206 is controlled based on the control of the control unit 209. Specifically, the pickup 201 irradiates the BCA area 103. , The pit data is output to the filter 206.
[0053]
Since the BCA area 103 is an area which is first read out by the pickup 201 after the DVD 100 is stored in a storage unit (not shown), normally, pit data is output to the slicer 207 in the initial setting. I have.
[0054]
The amplifier 202 performs predetermined amplification processing and waveform shaping processing on the pit data detected by the pickup 201, generates a reproduction signal, and outputs the reproduction signal to the demodulation unit 203.
[0055]
The demodulation unit 203 is supplied with a reproduction signal that has been subjected to a predetermined process by the amplifier 202. The demodulation unit 203 performs a predetermined demodulation process on the reproduction signal and outputs audio information. In addition, encrypted information in which video information is encrypted and content management information are generated.
[0056]
The demodulation unit 203 outputs the generated encryption information to the decryption unit 204 and outputs the generated content management information to the control unit 209 or the outside.
[0057]
The encryption information generated by the demodulation unit 203 is input to the decryption unit 204. The decryption unit 204 performs a predetermined decryption process on the encryption information and performs encryption processing. The decrypted content information is decoded and output to the decoder 205.
[0058]
The decoder 205 receives decoded content information, that is, audio information and video information having a predetermined format. The decoder 205 outputs the input audio information and video information having a predetermined format. Is demodulated to the original data format and output to the outside.
[0059]
The pit data (reproduced signal) detected by the pickup 201 as shown in FIG. 6A is input to the filter 206. As shown in FIG. The high frequency component is cut from the input pit data and output to the slicer 207.
[0060]
The pit data from which the high-frequency component has been cut is input to the slicer 207. As shown in FIG. 6C, the slicer 207 is determined in advance with respect to the input pit data. The binarization processing is performed based on the obtained level (slice level), bit data is obtained, and the obtained bit data is output to the BCA data decoder 208.
[0061]
The bit data output from the slicer 207 is input to the BCA data decoder 208. The BCA data decoder 208 performs a predetermined demodulation process and an error correction process on the input bit data. To obtain the BCA data, and output the BCA data to the control.
[0062]
The control unit 209 mainly includes a central processing unit (hereinafter, referred to as a CPU) and a memory, and performs control of each unit at the time of reproducing the content information and control of BCA data acquisition processing to be described later. ing.
[0063]
In particular, the control unit 209 receives the BCA data acquired by the BCA data decoder 208. The control unit 209 performs the setting of each unit when the DVD 100 is reproduced based on the input BCA data. And control.
[0064]
The operation of the acquisition process for acquiring the BCA data will be described later in detail.
[0065]
As described above, in the present embodiment, since the signal level is different between the mirror surface portion in the BCA area 103 and the portion where the pit data exists, the filtering process and the binarization process are performed on the detected pit data, so that the bit Data can be obtained.
[0066]
Next, a process of acquiring BCA data during a reproducing operation according to the present embodiment will be described with reference to FIG.
[0067]
FIG. 7 is a flowchart illustrating the operation of the BCA data acquisition process according to the present embodiment.
[0068]
First, when the DVD 100 is input to a storage unit (not shown), the control unit 209 causes the pickup 201 to start emitting a light beam from the innermost circumference to the outer circumference of the DVD 100, and outputs pit data to the filter 206 (step 209). S11).
[0069]
Next, when the pit data is input, the filter 206 cuts high-frequency components having frequencies equal to or higher than a predetermined frequency and outputs the cut signals to the slicer 207 (step S12).
[0070]
Next, the slicer 207 performs a binarization process on the pit data from which the high frequency component has been cut based on a predetermined signal level, generates bit data, and outputs the bit data to the BCA data decoder 208 (step S13). ).
[0071]
Finally, when the bit data is input, the BCA data decoder 208 obtains the BCA data based on the input bit data, outputs the obtained BCA data to the control unit 209, and ends the operation (step S10). S14).
[0072]
The control unit 209 performs setting of each unit and control of each unit based on the input BCA data.
[0073]
As described above, according to the present embodiment, the recording area 105 in which the content information is recorded and the control information for controlling the reproduction of the content information cause the phase pits to be formed in a band in the rotation direction for each track. A BCA area 103 recorded by arranging the band-shaped phase pits in the same direction in any radial direction of the optical disc; and in the BCA area 103, each bit is a pit in the rotation direction of the phase pit. It has a configuration in which control information is recorded by being formed by an arrangement of numbers and phase pits in the radial direction.
[0074]
With this configuration, in this embodiment, in the BCA area 103, each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction, and control information is recorded.
[0075]
In general, BCA data can also be recorded on a read-only DVD by using the above-mentioned reflective film. However, since a structure different from the phase pit structure of other recording areas is required, in this case, This will increase costs.
[0076]
In the present embodiment, with the above-described configuration, when the DVD 100 having the BCA area 103 is reproduced, the data recorded in the BCA area 103 is applied to the track from which the pickup 201 reads data by using a reflective film. A shape similar to the BCA data generated by the above can be formed.
[0077]
Therefore, the phase pit data recorded in the BCA area 103 can be read out as BCA data by the reproducing mechanism for reproducing the BCA data, and the rewritable DVD and the reproduction-only DVD are reproduced only by the reproducing mechanism for reproducing the BCA data. Both of the DVDs 100 can be easily and accurately reproduced.
[0078]
Further, in the present embodiment, a pickup 201 for reading each pit data from the DVD 100 based on the reflectance of the phase pit, a filter 206 for performing a predetermined waveform processing on each read pit data, And a BCA data decoder 208 that generates control information based on the binarized bit data.
[0079]
With this configuration, in the present embodiment, each bit is formed by the arrangement of at least one of the number of pits in the rotation direction of the phase pit or the pit width of each pit and the arrangement of the phase pits in the radial direction, and control information is recorded. The data recorded in the area 103 is subjected to preset waveform processing and binarization processing to generate BCA data.
[0080]
Therefore, the data recorded in the BCA area 103 can be formed in the same shape as the BCA data generated by the reflection film, and the phase recorded in the BCA area 103 by a reproducing mechanism for reproducing the BCA data can be formed. The pit data can be read as BCA data, and the BCA data is reproduced without the need to use a reproduction mechanism corresponding to the read-only DVD 100, that is, a reproduction mechanism for reproducing the PEP data recorded in the PEP area. DVDs for both rewritable DVDs and read-only DVDs can be played back only by the playback mechanism for this purpose.
[0081]
In the present embodiment, in the BCA area, each pit width of the phase pits in the line direction is formed to be 1/4 or less of 1 bit length, or the total width of the pits is formed to be 1/4 or less of 1 bit length. The control information is recorded by each set bit.
[0082]
As described above, when a BCA region is normally formed by a reflective film, the BCA data is recorded by destroying and removing the reflective film. Since the BCA data is easily peeled, the bit length of one bit of the BCA data is formed to be 1/4 or less.
[0083]
Specifically, when a recording film is formed of a phase-change material such as a rewritable DVD, the reproduction control area for recording control data usually has an average value with respect to the recording film before recording control information such as BCA data. The reflectance shows about 20%.
[0084]
Therefore, when recording the control information on the recording film, the area indicating 1 bit data is halved, and the 1 bit data is determined by the combination of the presence and absence of the recording film at the front and rear of the area in the rotation direction. With this configuration, the average reflectance for the recording film on which the control information is recorded remains at about 10%, and the average reflectance is reduced, which adversely affects focusing when reading and writing information. .
[0085]
Therefore, in a rewritable DVD having a recording film formed of a phase change material, when recording control information by BCA data, it is necessary to form 1-bit data in order to easily and stably set the focus. The area where the film is destroyed is formed to 1/4 or less of 1 bit, and the average reflectance is set to 15% or more.
[0086]
In the present embodiment, with the above configuration, each pit width of the phase pit in the line direction is formed to be 1/4 or less of 1 bit length, or the entire width of the number of pits is formed to be 1/4 or less of 1 bit length. Therefore, the compatibility of the BCA data can be ensured, and both the rewritable DVD and the read-only DVD can be reproduced only by the reproducing mechanism for reproducing the BCA data.
[0087]
In the reproducing apparatus 200 of the present embodiment, the BCA data in the BCA area 103 of the DVD 100 is formed based on a plurality of pit structures in the circumferential direction of the DVD 100. When the pits are formed by pits, the detected pit data is directly input to the slicer 207 from the pickup 201 as shown in FIG.
[0088]
In this case, as shown in FIG. 9, the slicer 207 performs a binarization process on the input pit data based on a predetermined signal level (slice level).
[0089]
In addition, the playback device of the present embodiment is configured to generate bit data based on a plurality of pit data and a mirror portion by a filter, but input a plurality of pit data constituting the bit data directly to the slicer, After the binarization processing, one pulse data serving as a base of bit data may be generated for each of a plurality of pits.
[0090]
In this case, a one-shot vibrator is provided in the reproducing apparatus in place of the filter of the above-described embodiment, and other configurations are the same as those of the above-described embodiment.
[0091]
Specifically, as shown in FIG. 10, the reproducing device 400 includes a pickup 201, an amplifier 202, a demodulation unit 203, a decoding unit 204, a decoder 205, and a binary Slicer 207 for performing binarization processing, one-shot multivibrator 401 for performing predetermined processing based on binarized pit data, and BCA data decoder 208 for decoding binarized pit data into BCA data And a control unit 209 that performs overall control of the above components while transmitting and receiving necessary control information via a bus, and generates control information based on BCA data.
[0092]
The slicer 207 receives pit data directly detected from the pickup 201. The slicer 207 receives the pit data from the input pit data as shown in FIGS. Then, binarization processing is performed based on a predetermined signal level (slice level), and the binarized pit data is output to the one-shot multivibrator 401.
[0093]
Further, the one-shot multivibrator 401 generates a pulse as a basis of 1-bit bit data based on the input pit data, and outputs the generated pulse to the BCA data decoder 208.
[0094]
Specifically, as shown in FIG. 11C, the one-shot multivibrator generates a pulse having a length of a plurality of pit portions when pit data is input.
[0095]
With such a configuration, it is possible to obtain the same effect as the above-described embodiment.
[0096]
Further, in the present embodiment, the BCA data is acquired by the reproducing apparatus 200. However, a recording medium in which the reproducing program for performing the above-described reproducing operation is recorded in the reproducing apparatus 200, and the reproducing program is read and executed. The above-described reproduction operation may be realized by providing a computer that performs the above-described reproduction.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining the correspondence between a reproduction signal recorded in a BCA area and BCA data.
FIG. 2 is a diagram showing a physical structure of an optical disc (DVD) according to the embodiment of the present application.
FIG. 3 is a diagram for explaining a physical structure when a BCA is formed by phase pits in one embodiment.
FIG. 4 is a detailed view of a phase pit forming one BCA data in one embodiment.
FIG. 5 is a block diagram illustrating a configuration of a playback device according to an embodiment of the present application.
FIG. 6 is a diagram for describing data processing by filter processing and binarization processing according to one embodiment.
FIG. 7 is a flowchart illustrating an operation of reading control information recorded in a BCA area according to an embodiment.
FIG. 8 is a block diagram illustrating a configuration of a playback device according to another embodiment of the present application.
FIG. 9 is a diagram illustrating data processing by binarization processing according to another embodiment.
FIG. 10 is a block diagram illustrating a configuration of a playback device according to another embodiment of the present application.
FIG. 11 is a diagram for describing data processing by binarization processing and pulse generation processing according to another embodiment.
[Explanation of symbols]
100… DVD
103… BCA area
105… recording area
200, 300, 400 ... playback device
206… Filter
207… Slicer
208… BCA data decoder
209… control unit
401… one shot vibrator

Claims (14)

A content information area in which content information is recorded;
The control information for controlling the reproduction of the content information causes the phase pits to be formed in a band in the rotation direction for each track, and the band-shaped phase pits for each track to be the same in any radial direction of the optical disc. A control information area recorded by being arranged;
Is provided,
In the control information area, each bit is formed by at least one of the number of pits in the rotation direction of the phase pit or the pit width of each pit and the arrangement of the phase pits in the radial direction, and the control information is recorded. A read-only optical disc characterized by the above-mentioned. The read-only optical disc according to claim 1,
The read-only optical disc, wherein the control information is recorded in a barcode format in the control information area. The read-only optical disk according to claim 1 or 2,
The read-only optical disk, wherein the control area is a BCA (Burst Cutting Area) area. The read-only optical disc according to claim 1,
In the control information area, each pit width in the rotation direction of the phase pit is at least one-fourth of a 1-bit length or the entire width of the number of pits is one-fourth or less of a one-bit length. A read-only optical disc, wherein the control information is recorded by each bit formed by the above-mentioned. A content information area in which content information is recorded;
The control information for controlling the reproduction of the content information is such that phase pits are formed in a band in the rotation direction for each track, and the band-shaped phase pits for each track are made the same in any radial direction of the optical disc. A control information area recorded by arranging the bits, wherein each bit has at least one of the number of pits in the rotation direction of the phase pits and the pit width of each pit in the radial direction. A reproducing apparatus for reproducing an optical recording medium on which the control information is recorded formed by the arrangement of the phase pits,
Reading means for reading each pit data from the optical recording disk based on the amount of reflected light from the phase pits,
Data processing means for performing binarization processing on each of the read pit data to obtain bid data;
Generating means for generating the control information based on the obtained bit data,
A playback device comprising: The playback device according to claim 5,
Wherein each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction,
The data processing means,
A filter for performing a predetermined waveform processing on each of the pit data read by the reading means,
A binarization processing means for performing a binarization process on the waveform-processed data;
A playback device comprising: The playback device according to claim 5,
Wherein each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction,
The data processing means,
Binarization processing means for performing a value processing on each of the pit data read by the reading means;
Acquiring means for acquiring bit data based on the number of data of each binarized pit data and the value of the pit data;
A playback device comprising: A content information area in which content information is recorded;
The control information for controlling the reproduction of the content information is such that phase pits are formed in a band in the rotation direction for each track, and the band-shaped phase pits for each track are made the same in any radial direction of the optical disc. A control information area recorded by arranging the bits, wherein each bit has at least one of the number of pits in the rotation direction of the phase pits and the pit width of each pit in the radial direction. A reproduction method for reproducing an optical recording medium on which the control information is recorded formed by the arrangement of the phase pits,
A reading step of reading each pit data from the optical recording disk based on the amount of reflected light from the phase pit,
A data processing step of performing a binarization process on each of the read pit data to obtain bid data;
A generation step of generating the control information based on the obtained bit data,
A reproduction method characterized by including: The reproduction method according to claim 8,
Wherein each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction,
The data processing step includes:
A waveform processing step of performing predetermined waveform processing on each of the pit data read by the reading step;
A binarization processing step of performing a binarization processing on the waveform-processed data;
A reproduction method characterized by including: The reproduction method according to claim 8,
Wherein each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction,
The data processing step includes:
A binarization processing step of performing a value processing on each of the pit data read in the reading step;
An acquisition step of acquiring bit data based on the number of data of each binarized pit data and the value of the pit data;
A reproduction method characterized by including: A content information area in which content information is recorded;
The control information for controlling the reproduction of the content information is such that phase pits are formed in a band in the rotation direction for each track, and the band-shaped phase pits for each track are made the same in any radial direction of the optical disc. A control information area recorded by arranging the bits, wherein each bit has at least one of the number of pits in the rotation direction of the phase pits and the pit width of each pit in the radial direction. A reproduction program for reproducing, by a computer, an optical recording disk formed by the arrangement of the phase pits and recording the control information,
Reading means for reading the pit data from the optical recording disk based on the amount of reflected light from the phase pits,
Data processing means for performing a binarization process on each of the read pit data to obtain bid data;
Generating means for generating the control information based on the obtained bit data,
A reproduction program characterized by functioning as: The playback program according to claim 11,
Wherein each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction,
Waveform processing means for performing predetermined waveform processing on the read pit data by the computer,
A binarization processing unit that performs a binarization process on the waveform-processed data to obtain bit data;
A reproduction program characterized by functioning as: The playback program according to claim 11,
Wherein each bit is formed by the number of pits in the rotation direction of the phase pits and the arrangement of the phase pits in the radial direction,
Said computer,
Binarization processing means for performing a value conversion process on each of the pit data read in the reading step;
Acquiring means for acquiring bit data based on the number of data of each binarized pit data and the value of the pit data;
A reproduction program characterized by functioning as: 14. A recording medium, wherein the reproduction program according to any one of the items 11 to 13 is recorded in a computer-readable manner.

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