JP3427353B2 - Optical disc, multi-session optical disc, method and apparatus for recording digital signal on optical disc - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, a multi-session optical disc, a method for recording a digital signal on the optical disc, and a recording apparatus, and more particularly to a measure for preventing a copy of the optical disc.

[0002]

2. Description of the Related Art Data recorded on a CD-ROM (compact disc read-only memory) is recorded on a CD.
-Preventing reading by a ROM reading device and copying the read data to a CD-R (compact disc recordable), CD-RW (compact disc recordable and writable), etc. by a writing device. As a conventional measure, CD-RO
For example, some pits of M are destroyed to provide a physically inaccessible area, or an error detection code or an error correction code is processed to intentionally generate an error.

[0003]

The conventional copy protection measures described above are not preferable because the CD-ROM is processed so as not to meet its standard. Further, conventional copy protection measures for a CD (compact disc) on which music or the like is recorded are considerably less than copy protection measures for a CD-ROM.

In view of the above points, the present invention provides an optical disc, a multi-session optical disc, in which copy protection is ensured without making the optical disc not conform to its standard.
An object of the present invention is to propose a recording method and a recording device for recording a digital signal on an optical disc.

The present invention also provides a multi-session optical disc capable of ensuring copy protection, a method of recording a digital signal on the optical disc, and a recording method, without making the multi-session optical disc capable of recording audio data not conform to the standard thereof. It is intended to propose a device.

[0006]

According to a first aspect of the present invention, in an optical disc provided with a large number of sectors each having a user data area, at least a part of sectors in which no information data is recorded in the user data area. Is an optical disc in which a synchronization pattern signal is recorded in the user data area of the.

According to the optical disc of the first aspect of the present invention, the sync pattern signal is recorded in the user data area of at least a part of the sectors in which no information data is recorded in the user data area. Since the sync pattern signal is frequently reproduced at the time of reproduction (reading) by the (reading device), an error occurs because the start timing of the sector is not clear, and the optical disk recording connected to the optical disk reproducing device (reading device) The error is transmitted to the device (writing device),
It becomes impossible to copy.

A second aspect of the present invention is a multi-session optical disc provided with a plurality of sessions each having a plurality of sectors each having a user data area, excluding a session including a sector in which information data is recorded in the user data area. It is a multi-session optical disc in which a synchronization pattern signal is recorded in a user data area of at least a part of sectors in a session.

A third aspect of the present invention scrambles a sector signal that does not include information data in the user data area in an input digital signal composed of a large number of sector signals each including a user data area and an error code, and scrambles the scrambled signal. A sync pattern signal is inserted in the user data area in the multiplied sector signal, the scrambled sector signal in which the sync pattern signal is inserted is descrambled, and the error code in the descrambled sector signal Is replaced with a new error code that has been recalculated, and the descrambled sector signal containing the new error code is scrambled to obtain an output digital signal, and the output digital signal is modulated,
This is a method for recording a digital signal on an optical disc, in which a laser beam is optically modulated by the modulated digital signal and the optical-modulated laser beam is irradiated onto the optical disc.

A fourth aspect of the present invention includes a sector signal in which information data exists in a user data area in an input digital signal having a plurality of session signals each including a plurality of sector signals each including a user data area and an error code. Scrambling at least part of the sector signal in the session signal excluding the session signal, inserting the sync pattern signal in the user data area in the scrambled sector signal, and inserting the sync pattern signal in the scramble The descrambled sector signal is descrambled, the error code in the descrambled sector signal is replaced with a new error code recalculated, and the descrambled sector signal including the new error code is replaced. Scramble to get the output digital signal, And modulation of the output digital signal, a laser beam is optically modulated by the modulated digital signal, a method of recording digital signals of the light modulated laser beam to the optical disk is irradiated on the optical disk.

A fifth aspect of the present invention scrambles a sector signal which does not include information data in the user data area in an input digital signal composed of a large number of sector signals each including a user data area and an error code, and scrambles the scrambled signal. A sync pattern signal is inserted in the user data area in the multiplied sector signal, the scrambled sector signal in which the sync pattern signal is inserted is descrambled, and the error code in the descrambled sector signal , The signal processing means for substituting the recalculated new error code, scrambling the descrambled sector signal containing the new error code to obtain the output digital signal, and the output from the signal processing means Modulating means for modulating a digital signal and laser light modulating means And a light modulating means for optically modulating the output signal, the optical light modulated laser light from the modulating means is a recording apparatus for digital signals to optical disc be irradiated on the optical disk.

A sixth aspect of the present invention includes a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a plurality of sector signals each including a user data area and an error code. The sector signal in the session signal excluding the session signal is scrambled, the sync pattern signal is inserted in the user data area in the scrambled sector signal, and the sync pattern signal is inserted and scrambled The sector signal is descrambled, and the error code in the descrambled sector signal is
A signal processing means for replacing the newly calculated error code with a new error code, scrambling the descrambled sector signal containing the new error code to obtain an output digital signal, and an output digital signal from the signal processing means And a light modulating means for optically modulating the laser light with the output signal of the modulating means, and the light modulated laser light from the light modulating means is irradiated onto the optical disc. A device for recording digital signals on an optical disc.

According to a seventh aspect of the present invention, in an optical disc provided with a large number of sectors each having a user data area, the user data area is synchronized with the user data area of at least a part of the sectors in which no information data is recorded. This is an optical disc on which a pattern signal and a dummy header signal following it are recorded.

An eighth aspect of the present invention is a multi-session optical disc provided with a plurality of sessions each having a plurality of sectors each having a user data area, excluding a session including a sector in which information data is recorded in the user data area. A multi-session optical disc in which a sync pattern signal and a dummy header signal following the sync pattern signal are recorded in a user data area of at least a part of sectors in a session.

A ninth aspect of the present invention scrambles a sector signal which does not include information data in the user data area in an input digital signal composed of a large number of sector signals each including a user data area and an error code, and scrambles the scrambled signal. A sync pattern signal and a dummy header signal following it are inserted in the user data area in the multiplied sector signal, and the scrambled sector signal with the sync pattern signal and the dummy header signal following is inserted into the user data area. Scramble, replace the error code in the descrambled sector signal with a new error code that has been recalculated, scramble the descrambled sector signal containing the new error code, and output digital The signal is obtained, the output digital signal is modulated, and the laser The optically modulated by the modulated digital signal, a method of recording digital signals of the light-modulated laser beam to the optical disc so as to irradiate onto the optical disc.

According to a tenth aspect of the present invention, in an input digital signal having a plurality of session signals each consisting of a plurality of sector signals each containing a user data area and an error code,
At least a part of the sector signals in the session signal except the session signal including the sector signal in which the information data exists in the user data area is scrambled, and the user data area in the scrambled sector signal is synchronized with the synchronization pattern signal and Insert a dummy header signal following this, descramble the scrambled sector signal in which the synchronization pattern signal and the dummy header signal following this are inserted, and determine the error code in the descrambled sector signal. , Replace the new error code recalculated respectively, scramble the descrambled sector signal containing the new error code to obtain the output digital signal, modulate the output digital signal, and Optical modulation with a modulated digital signal and its optical modulation The laser beam is a recording method of a digital signal to the optical disc so as to irradiate onto the optical disc.

The eleventh aspect of the present invention scrambles a sector signal that does not include information data in the user data area in an input digital signal composed of a large number of sector signals each including a user data area and an error code, and scrambles the scrambled signal. A sync pattern signal and a dummy header signal following the sync pattern signal are inserted in the user data area in the multiplied sector signal, and the scrambled sector signal with the sync pattern signal and the dummy header signal following is inserted into the user data area. Digital signal that is scrambled, replaces the error code in the descrambled sector signal with a new error code that has been recalculated, and scrambles the descrambled sector signal that contains the new error code. From the signal processing means for obtaining It has a modulating means for modulating the output digital signal and an optical modulating means for optically modulating the laser light with the output signal of the modulating means, and irradiates the optical disk with the optically modulated laser light from the optical modulating means. This is a device for recording a digital signal on the optical disc.

A twelfth aspect of the present invention is to provide an input digital signal having a plurality of session signals each of which comprises a plurality of sector signals each containing a user data area and an error code.
The sector signal in the session signal excluding the session signal including the sector signal in which the information data exists in the user data area is scrambled, and the user data area in the scrambled sector signal is synchronized with the sync pattern signal and the dummy following it. A header signal is inserted, the sync pattern signal and the subsequent dummy header signal are inserted, and the scrambled sector signal is descrambled, and the error code in the descrambled sector signal is calculated. A signal processing unit that replaces the corrected new error code, scrambles the descrambled sector signal containing the new error code to obtain an output digital signal, and modulates the output digital signal from the signal processing unit Modulation means and laser light output from the modulation means No. and a light modulating means for optically modulated by, the optical light modulated laser light from the modulating means is a recording apparatus for digital signals to an optical disk to irradiate onto the photosensitive layer on the optical disc.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, examples of an optical disc, a multi-session optical disc, a method of recording a digital signal on the optical disc, and a recording apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

First, with reference to FIG. 1, an example of a cutting machine as an apparatus for recording digital signals on an optical disc will be described. Reference numeral 9 denotes a glass master of an optical disc or a multi-session optical disc, on which a photoresist (photochemical reaction agent) is thinly applied, and a photoresist layer (photosensitive layer) is adhered and formed, though not shown. There is. A spindle motor 10 rotates a spindle (not shown) in which the glass master 9 is loaded. 11 is a spindle servo circuit that drives the spindle motor 10.
A spindle pulse obtained according to the rotation of the spindle motor 10 is supplied to the servo circuit 11, and a focused laser beam from the objective lens 8 is applied to a photoresist layer (not shown) on the glass master 9. The servo circuit 1 is formed so that a spiral track close to a circle with a constant linear velocity is formed.
1 servos the spindle motor 10.

Reference numeral 5 denotes a recording laser light generator (for example, He
-Cd laser generator), the laser light from this is supplied to the optical modulator 6, modulated by the signal from the 8-14 modulation circuit 4, and then enters the reflecting mirror 7, and its optical path is changed. For example, after being deflected by 90 °, it is incident on the objective lens 8 and focused, and the focused laser light is applied to the photoresist layer on the glass master 9. Although not shown,
An optical head including the reflecting mirror 7 and the objective lens 8 can be moved from the center side to the outer peripheral side on the radius of the glass master 9 by a head driving device (not shown). Further, this optical head is provided with focusing servo means.

The rotating optical glass master 9 is fixed so that the focused laser beam from the optical head scans the radius of the photoresist layer on the optical glass master 9 from the center side to the outer peripheral side. You may make it move linearly.

Reference numeral 1 denotes a master medium (master recording medium) reproducing device which reproduces, for example, a program data signal recorded on a master medium, for example, a master magnetic tape. The program data from the master media reproducing apparatus 1 is supplied to the microcomputer 2 and subjected to copy protection processing, and then supplied to the sub-master media recording / reproducing apparatus 3 so that the sub-master medium, for example, the sub-master magnetic disk. It is recorded on the tape, reproduced, and supplied to the 8-14 modulation circuit 4,
It is designed to be 4 modulated. Incidentally, the master media reproducing apparatus 1 and the sub-master media recording / reproducing apparatus 3
Are controlled by the microcomputer 2.

The master media of the master media player 1 may be an optical disk, a magneto-optical disk, a magnetic disk, a semiconductor memory, etc., in addition to the magnetic tape. Further, as the sub-master medium of the sub-master medium recording / reproducing apparatus 3, a recordable / reproducible optical disc, a magneto-optical disc, a magnetic disc, a semiconductor memory or the like can be used.

Further, instead of the glass master 9, a CD-R,
It is also possible to use a recordable optical disk such as a DVD-R, a CD-RW, a DVD-RW, or a magneto-optical disk.
An optical head, an optical head cooperating with a magnet, or the like is used according to the type of the disk.

Next, with reference to FIG. 2, an example of the track structure of the optical disc to which the copy protection processing is applied and the method of the copy protection processing will be described. 2A shows an example of the track structure of a CD-ROM, and FIG. 2B shows an example of the track structure of a multi-session optical disc.

First, an example of the track structure of the CD-ROM shown in FIG. 2A will be described. An additional data section is provided on the rear side (or the front side) of the valid data section in the data section which is composed of a number of consecutive sectors (blocks) between the lead-in and lead-out areas. The mode 1 sector of the CD-ROM is composed of a synchronization signal, a header, user data (area), an error detection code EDC and an error correction code ECC, as shown in FIG. 3A described later.

Incidentally, although not shown, a CD-ROM
In the sector of mode 2 form 1 (with error correction code), a subheader is added between the header and user data. The sub-header is added to the sector of CD-ROM mode 2 form 2 (no error code),
ECC is omitted.

As can be seen from FIG. 3A, the sector of the CD-ROM has a sync signal, but in the case of the CD audio sector, no sync signal is provided.

Program data is recorded in the user data area of each sector of the effective data section. No program data is recorded in the user data area of each sector of the additional data section. Then, one or more sync pattern signals are inserted into the user data area of at least one sector (all sectors are possible) of this additional data portion. One or a plurality of sync pattern signals and dummy header signals following each may be inserted in this user data area.

Next, an example of the multi-session optical disc structure shown in FIG. 2B will be described. A first session and a second session are provided, and a lead-in section and a lead-out section are provided before and after each of them. Program data (or audio data) is recorded in the user data area of each sector of the valid data portion of the first session.
Neither program data nor audio data is recorded in the user data area of each sector of the additional data section of the second session. Therefore, in at least some sectors (all sectors are acceptable) of the additional data part of the second session,
One or more synchronization pattern signals are inserted. One or a plurality of sync pattern signals and dummy header signals following each may be inserted in this user data area.

As an example of the synchronization pattern signal, a 12-byte "00FFFFFFFFFFFFFFFFFFF
F00 ”, but is not limited to this.

Next, referring to the flowchart of FIG.
The operation of the copy prevention processing (recording method) by the microcomputer 2 in the cutting machine as the recording apparatus of the digital signal on the optical disk in FIG. 1 will be described. The master media reproducing device 1 reproduces, for example, program data recorded on a master magnetic tape as a master medium, and the program data is supplied to the microcomputer 2.

In step ST-1, the microcomputer 2 determines, out of a large number of sectors of the program data, a sector into which the sync pattern signal is inserted in the user data area. FIG. 3A shows one of the sectors for which it has been decided to insert a synchronization pattern signal. An example of how to determine the sector is as described in the description of FIGS. 2A and 2B, but is not limited to that. Step ST-
After 1, the process proceeds to step ST-2.

In step ST-2, as shown in FIG. 3B, after scrambling the inside of the sector (excluding the sync signal), the process proceeds to step ST-3. Step ST-
In step 3, one or more sync pattern signals SP are inserted into the scrambled user data area, and then the process proceeds to step ST-4.

In step ST-4, as shown in FIG. 3D, the inside of the sector (excluding the sync signal) is descrambled, and then the process proceeds to step ST-5. Step ST
In -5, the error detection code EDC 'and the error correction code ECC' newly calculated based on the intra-sector signal are replaced with the original error detection code EDC and the error correction code ECC, and then the step Transition to ST-6. In step ST-6, the inside of the sector (excluding the sync signal) is scrambled, and the process ends.

As described above, in step ST-5, the error detection code EDC 'and the error correction code ECC' newly obtained by the new calculation based on the intra-sector signal are obtained.
Is replaced with the original error detection code EDC and error correction code ECC, so that no error occurs due to the error detection code and error correction code.

In the description of FIG. 3, the sync pattern signal is inserted into the user data area that does not include the information data in the sector, but the sync pattern signal and the dummy header signal following it are inserted into the user data area. You may do it.

According to the above-mentioned optical disc, the sync pattern signal (or the sync pattern signal and the dummy header signal following it) is recorded in the user data area of the sector in which the information data is not recorded in the user data area. In an optical disc recording device (writing device), the file system of data reproduced (read) by the optical disc reproducing device (reading device) is ignored, and the logical sector structure of the optical disc is used as it is for CD-R, CD-RW, or the like. Since copying, that is, writing is performed in many cases, the sync pattern signal in the user data area in the sector is immediately read after the sync signal in the sector is reproduced (read) by the optical disk reproducing device (reader). When played (read), the start position of the sector cannot be specified and Give up Seth, an error occurs, the optical disk reproducing apparatus the optical disc recording device connected to the (reading device) (writing device), this error is transmitted, the copy impossible.

[0040]

According to the first aspect of the present invention, in an optical disc provided with a large number of sectors each having a user data area, the user of at least a part of the sectors in which no information data is recorded in the user data area. Since the synchronization pattern signal is recorded in the data area, it is possible to obtain an optical disc in which copy protection is ensured without making the optical disc not conform to the standard.

According to a second aspect of the present invention, in a multi-session optical disc provided with a plurality of sessions each of which has a user data area and is composed of a large number of sectors,
The sync pattern signal is recorded in the user data area of at least a part of the sectors in the session excluding the session including the sector in which the information data is recorded in the user data area. It is possible to obtain a multi-session optical disc in which copy protection can be surely performed and audio data can be used as information data.

According to the third aspect of the present invention, a sector signal which does not include information data in the user data area is scrambled in an input digital signal composed of a large number of sector signals each including a user data area and an error code. A sync pattern signal is inserted in the user data area in the scrambled sector signal, the scrambled sector signal in which the sync pattern signal is inserted is descrambled, and the scrambled sector signal in the descrambled sector signal is inserted. Replace the error code with a new error code that has been recalculated, scramble the descrambled sector signal containing the new error code, obtain the output digital signal, modulate the output digital signal, The laser light is optically modulated by the modulated digital signal and Since the laser light be irradiated onto the optical disc, without having to not align the optical disk to the standard, it is possible to obtain a recording method of a digital signal to the optical disc to ensure copy protection.

According to the fourth aspect of the present invention, a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a plurality of sector signals each including a user data area and an error code. Scramble at least a part of the sector signals in the session signal excluding the session signal including, the sync pattern signal is inserted in the user data area in the scrambled sector signal, and the sync pattern signal is inserted. , Descrambles the scrambled sector signal, replaces the error code in the descrambled sector signal with a new recalculated error code, and descrambles the new error code Scrambled sector signal output digital signal , The output digital signal is modulated, the laser light is optically modulated by the modulated digital signal, and the light-modulated laser light is irradiated onto the optical disc, so the optical disc does not meet the standard. Without doing so, it is possible to obtain a method for recording a digital signal on an optical disc that ensures copy protection and is capable of audio data as information data.

According to the fifth aspect of the present invention, a sector signal which does not include information data in the user data area is scrambled in an input digital signal which is composed of a large number of sector signals each including a user data area and an error code. A sync pattern signal is inserted in the user data area in the scrambled sector signal, the scrambled sector signal in which the sync pattern signal is inserted is descrambled, and the scrambled sector signal in the descrambled sector signal is inserted. Replace the error code with a new error code that has been recalculated, scramble the descrambled sector signal containing the new error code to obtain an output digital signal, and from the signal processing means Modulating means for modulating the output digital signal of
Since the optical modulation means for optically modulating the laser light with the output signal of the modulation means is provided, and the light-modulated laser light from the optical modulation means is applied to the optical disk, the optical disk conforms to the standard. It is possible to obtain a recording device of a digital signal on an optical disc, which is surely copy-protected, without making a mismatch.

According to the sixth aspect of the present invention, a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a plurality of sector signals each including a user data area and an error code. Scramble the sector signal in the session signal excluding the session signal, including the sync signal, insert the sync pattern signal in the user data area in the scrambled sector signal, and insert the sync pattern signal in the scramble The descrambled sector signal is descrambled, the error code in the descrambled sector signal is replaced with a new error code recalculated, and the scrambled sector signal including the new error code is scrambled. Multiplying the signal to obtain the output digital signal And a modulation means for modulating the output digital signal from the signal processing means, and a light modulation means for optically modulating the laser light with the output signal of the modulation means, and the light-modulated laser from the light modulation means Since the optical disc is irradiated with light, it is possible to obtain a digital signal recording device for the optical disc capable of ensuring the copy protection and making the audio data as the information data without making the optical disc not conform to the standard.

According to the seventh aspect of the present invention, in an optical disc provided with a large number of sectors each having a user data area, the user data area of at least a part of the sectors in which no information data is recorded in the user data area. Since the sync pattern signal and the dummy header signal following the sync pattern signal are recorded on the optical disc, it is possible to obtain an optical disc with more reliable copy protection without making the optical disc incompatible with the standard.

According to the eighth aspect of the present invention, in a multi-session optical disc provided with a plurality of sessions each of which has a user data area and which is composed of a large number of sectors,
The sync pattern signal and the dummy header signal following the sync pattern signal are recorded in the user data area of at least a part of the sectors in the session except the session including the sector in which the information data is recorded in the user data area. It is possible to obtain a multi-session optical disc in which the copy protection is further ensured and the audio data can be used as the information data without making the standard not comply with the standard.

According to the ninth aspect of the present invention, a sector signal which does not include information data in the user data area is scrambled in an input digital signal composed of a large number of sector signals each including a user data area and an error code. A synchronization pattern signal and a dummy header signal following it are inserted into the user data area in the scrambled sector signal, and the scrambled sector signal with the synchronization pattern signal and the following dummy header signal inserted Is descrambled, the error code in the descrambled sector signal is replaced with a new error code that has been recalculated, and the descrambled sector signal including the new error code is scrambled, Obtain the output digital signal, modulate the output digital signal, Since the laser light is optically modulated by the modulated digital signal and the light-modulated laser light is applied to the optical disc, the optical disc is further protected against copying without preventing the optical disc from meeting the standard. It is possible to obtain a method of recording a digital signal to the digital camera.

According to the tenth aspect of the present invention, a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a plurality of sector signals each including a user data area and an error code. Scramble at least a part of sector signals in the session signal excluding the session signal including, and insert a sync pattern signal and a dummy header signal following the sync pattern signal in the user data area in the scrambled sector signal, The sync pattern signal and the dummy header signal following it are inserted, the descrambled sector signal is descrambled, and the error code in the descrambled sector signal is recalculated with a new error code. A desk that replaces and contains the new error code The scrambled sector signal is scrambled to obtain an output digital signal, the output digital signal is modulated, the laser light is optically modulated with the modulated digital signal, and the light-modulated laser light is irradiated onto the optical disc. Therefore, it is possible to obtain a method of recording a digital signal on an optical disc that can further ensure copy protection and enable audio data as information data without making the optical disc not conform to the standard.

According to the eleventh aspect of the present invention, a sector signal which does not include information data in the user data area is scrambled in an input digital signal composed of a large number of sector signals each including a user data area and an error code, and A scrambled sector signal in which a sync pattern signal and a dummy header signal following the sync pattern signal are inserted into the user data area in the scrambled sector signal, and the sync pattern signal and a dummy header signal subsequent to the sync pattern signal are inserted. Is descrambled, the error code in the descrambled sector signal is replaced with a new error code that has been recalculated, and the descrambled sector signal containing the new error code is scrambled and output. Signal processing means for obtaining a digital signal and its signal processing means And an optical modulator that optically modulates a laser beam with an output signal of the modulator, and the laser beam optically modulated by the optical modulator is placed on an optical disc. Because it irradiates,
Without making the optical disc not meet that standard,
It is possible to obtain a recording device for recording a digital signal on an optical disc, in which copy protection is further ensured.

According to the twelfth aspect of the present invention, a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a plurality of sector signals each including a user data area and an error code. Scramble the sector signal in the session signal excluding the session signal, including the sync pattern signal and the dummy header signal following it in the user data area in the scrambled sector signal, and the sync pattern signal and Subsequent dummy header signal is inserted, the scrambled sector signal is descrambled, the error code in the descrambled sector signal is replaced with a new error code recalculated, respectively, and The descrambled session containing the new error code. Signal processing means for scrambling the digital signal to obtain an output digital signal, modulating means for modulating the output digital signal from the signal processing means, and optical modulating means for optically modulating laser light with the output signal of the modulating means. Since the optical modulation means irradiates the light-modulated laser light onto the optical disk, the copy protection is further ensured without making the optical disk conform to the standard, and the audio data is used as the information data. It is possible to obtain a recording device for a digital signal on an optical disc capable of performing the above.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a cutting machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a track structure of an optical disc to which copy protection processing according to an embodiment of the present invention is applied.

FIG. 3 is a flowchart showing an example of a method of recording a digital signal on an optical disc master according to the embodiment of the present invention.

[Explanation of symbols]

1 master media playback device, 2 microcomputer, 3 sub-master media recording / playback device, 48
-14 modulation circuit, 5 recording laser light generator, 6 light modulator, 7 reflecting mirror, 8 objective lens, 9 glass master,
10 spindle motor, 11 spindle motor servo circuit.

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-9-115242 (JP, A) JP-A-7-235130 (JP, A) JP-A-2001-266478 (JP, A) JP-A-2000-11536 ( JP, A) International publication 00/21086 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/10

Claims (12)

(57) [Claims] 1. An optical disc provided with a large number of sectors each having a user data area, wherein a synchronization pattern signal is present in the user data area of at least some of the sectors in which no information data is recorded in the user data area. optical disk characterized by comprising recorded. 2. In a multi-session optical disc provided with a plurality of sessions each of which has a user data area and a plurality of sectors, the sectors in the session other than the session including the sector in which the information data is recorded in the user data area. A multi-session optical disc, wherein a sync pattern signal is recorded in a user data area of at least a part of sectors. 3. A scrambled sector signal of an input digital signal composed of a number of sector signals each containing a user data area and an error code, wherein the sector signal does not contain information data in the user data area. A sync pattern signal is inserted in a user data area in the data block, the scrambled sector signal in which the sync pattern signal is inserted is descrambled, and the error code in the descrambled sector signal is Replace with a new error code that was recalculated, scramble the descrambled sector signal containing the new error code to obtain an output digital signal, modulate the output digital signal, and modulate the laser light The modulated digital signal is optically modulated, and the optically modulated laser light is optically modulated. Recording method of a digital signal to an optical disk, which comprises irradiating the above. 4. A session excluding a session signal including a sector signal having information data in the user data area in an input digital signal having a plurality of session signals each including a user data area and a plurality of sector signals including an error code. At least a part of the sector signal in the signal is scrambled, a synchronization pattern signal is inserted in the user data area in the scrambled sector signal, and the above-mentioned scrambled portion in which the synchronization pattern signal is inserted The sector signal is descrambled, the error code in the descrambled sector signal is replaced with a new recalculated error code, and the descrambled sector signal including the new error code is scrambled. To obtain an output digital signal, Modulating the signal, a laser beam is optically modulated by a digital signal which is said modulated recording method of a digital signal to the optical disc and then irradiating the light modulated laser beam on the optical disk. 5. A scrambled sector signal is scrambled in a sector signal which does not include information data in the user data area in an input digital signal composed of a plurality of sector signals each including a user data area and an error code. A sync pattern signal is inserted in the user data area of the inside, and the scrambled sector signal in which the sync pattern signal is inserted is descrambled,
The error code in the descrambled sector signal is replaced with a new error code that has been recalculated, and the descrambled sector signal including the new error code is scrambled to obtain an output digital signal. A signal processing unit, a modulating unit that modulates an output digital signal from the signal processing unit, and an optical modulating unit that optically modulates laser light with an output signal of the modulating unit. An apparatus for recording a digital signal on an optical disk, which irradiates the optical disk with the generated laser light. 6. A session excluding a session signal including a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a user data area and a plurality of sector signals including an error code. The sector signal in the signal is scrambled, the sync pattern signal is inserted in the user data area in the scrambled sector signal, and the scrambled sector signal in which the sync pattern signal is inserted is descrambled. Scramble, replace the above error code in the descrambled sector signal with a new recalculated error code, scramble the descrambled sector signal containing the new error code, and output digital Signal processing means for obtaining a signal, and the signal processing means And a light modulating means for optically modulating the laser light with the output signal of the modulating means, and the laser light optically modulated by the light modulating means on the optical disc. A device for recording a digital signal on an optical disk, which is characterized by irradiation. 7. An optical disc provided with a large number of sectors each having a user data area, wherein a sync pattern signal and a sync pattern signal are provided in a user data area of at least a part of sectors in which no information data is recorded in the user data area. An optical disc having a subsequent dummy header signal recorded therein. 8. A multi-session optical disc provided with a plurality of sessions each having a large number of sectors each having a user data area, the sectors in the session excluding the session including the sector in which information data is recorded in the user data area. A multi-session optical disc, wherein a sync pattern signal and a dummy header signal following the sync pattern signal are recorded in a user data area of at least a part of the sectors. 9. A scrambled sector signal obtained by scrambling a sector signal which does not include information data in the user data area in an input digital signal composed of a plurality of sector signals each containing a user data area and an error code. insert the user data area in the sync pattern signal and dummy header signal subsequent thereto in, inserted in the synchronization pattern signal and subsequent dummy header signal, descrambles the sector signals which are multiplied with the scrambling, the The above error code in the descrambled sector signal is replaced with a new error code that has been recalculated, and the descrambled sector signal including the new error code is scrambled to obtain an output digital signal. Modulates the output digital signal, modulates the laser light A method for recording a digital signal on an optical disc, which comprises: optically modulating with a digital signal and irradiating the optical disc with the optically modulated laser beam. 10. A session excluding a session signal including a sector signal in which information data exists in the user data area in an input digital signal having a plurality of session signals each including a user data area and a plurality of sector signals including an error code. At least a part of the sector signal in the signal is scrambled, a sync pattern signal and a dummy header signal following the sync pattern signal are inserted into the user data area in the scrambled sector signal, and the sync pattern signal and the following The scrambled sector signal with the dummy header signal inserted is descrambled, and the error code in the descrambled sector signal is replaced with a new error code that has been recalculated. Descrambled seg containing various error codes Characterized in that the signal is scrambled to obtain an output digital signal, the output digital signal is modulated, the laser light is optically modulated with the modulated digital signal, and the light-modulated laser light is irradiated onto an optical disc. A method of recording a digital signal on an optical disc. 11. A scrambled sector signal in which a sector signal which does not include information data in a user data area in an input digital signal composed of a plurality of sector signals each including a user data area and an error code is scrambled. A sync pattern signal and a dummy header signal following the sync pattern signal are inserted in the user data area in the descrambling sector signal, in which the sync pattern signal and the dummy header signal subsequent to the sync pattern signal are inserted. A signal for replacing the above error code in the descrambled sector signal with a new recalculated error code and scrambling the descrambled sector signal containing the new error code to obtain an output digital signal. Processing means and digital signal output from the signal processing means And a light modulating means for optically modulating the laser light with the output signal of the modulating means, and the light modulated laser light from the light modulating means is irradiated onto the optical disc. A device for recording digital signals on an optical disc. 12. A session excluding a session signal including a sector signal having information data in the user data area in an input digital signal having a plurality of session signals each including a user data area and a plurality of sector signals including an error code. The sector signal in the signal is scrambled, the sync pattern signal and the dummy header signal subsequent thereto are inserted into the user data area in the scrambled sector signal, and the sync pattern signal and the dummy header signal subsequent thereto are inserted. The inserted, descrambled sector signal is descrambled, and the error code in the descrambled sector signal is
Signal processing means for substituting the recalculated new error code and scrambling the descrambled sector signal containing the new error code to obtain an output digital signal, and an output digital signal from the signal processing means And a light modulating means for optically modulating a laser beam with an output signal of the modulating means, and irradiating the optical disc with the light beam modulated by the light modulating means. A device for recording digital signals on an optical disc.