CN1881424A - Apparatus and method for manufacturing optical disks, apparatus and method for recording data on optical disks, apparatus and method for reproducing data from optical disks, and optical disk - Google Patents

Abstract

Described herewith is an optical disk manufacturing apparatus for reading recorded digital data from an optical disk, comprising an encryption unit for encrypting entered digital data according to a plurality of key information; an optical disk substrate manufacturing unit for manufacturing an optical disk substrate on which the encrypted digital data and key information are recorded in the form of physical form changes; a reflection film forming unit for forming a reflection film on the optical disk substrate ; and a key information recording unit for recording key information on the optical disk substrate on which the reflection film is formed. The reflection factor of the optical disk is changed locally, thereby giving a jitter to the position information of each pit edge, and desired data is recorded additionally according to this jitter. Pits, etc. are disposed so as to be deviated from the track center towards the inner/outer region of the optical disk , thereby recording such sub-data as key information KY, etc.

Description

CD and the apparatus and method that are used to make CD, record or reproduce data of optical disk

The application is that application number is 200610074118.4, the applying date is on October 8th, 1999, denomination of invention is divided an application for the application for a patent for invention of " CD and the apparatus and method that are used to make CD, record or reproduce data of optical disk ".

Technical field

The present invention relates to a kind ofly be used to make the apparatus and method of CD, a kind of being used for data are recorded in the apparatus and method on the CD, a kind of being used for from the apparatus and method of optical disc replay data, and CD.For example, the present invention's pen recorder and transcriber that can be used for CD CD (COMPACTDISK), CD CD player, be used for the CD of recording audio data and can be used for CD.

Background technology

The present invention changes the reflectivity of CD partly, gives shake of locating information of each pit edge thus, thus with required data addition record on CD.As a result, various data can be recorded on the CD,, and can the serial data with pit string form record not reproduced without any adverse effect by bootlegging so that reproduce by the optical pick-up that reproduces serial data.

In addition, the present invention is to inside/outside area change position (bit) of CD etc., thereby this seed data is recorded as is key information etc., various data can be recorded on the CD thus, so that reproduce by the optical pick-up that reproduces serial data, and can the serial data with pit string form record not reproduced without any adverse effect by bootlegging.

Under the situation of traditional C D CD (CD), the serial data that write down through handling, must have been modulated (eight to 14 modulation), the data of recording audio data and so on thus then through EFM.

On the other hand, form a management record data district in the boot section of CD inner region, the TOC (TABLEOFCONTENTS, contents table) that is recorded on this recording areas is used for reproducing selectively required music performance data etc.

Aforesaid CD CD with various record data provides the recording areas that is used for IFPI (photographic industry alliance) code on the inner region of boot section, wherein, write down by the targeted customer use such as sound signal and TOC signals such as (contents table).In this district, also have such as title codes such as factory's title, CD numberings, according to these, the history of energy visual inspection CD CD.

Simultaneously, will be organized on each CD CD such as title datas such as fabricator's name, factory's title, number for chips, history that thus can visual inspection CD CD, and differentiate the bootlegging CD of making from original disc with this title data.Yet owing to write down so that the title data of visual inspection, so title data has produced a problem, promptly the optical pick-up of CD CD player can not easily reproduce data.In order to address this problem, need a kind of specific reproduction device that is used to reproduce title data, this device can be differentiated title data from the CD of bootlegging.

For example, if can duplicate by peel off the pressing mold that diaphragm and aluminium mirror coating produce from object optical disc, then the title data that will write down is with common pit form record, and can visual inspection.And this can not protect the CD CD not by the reason of bootlegging just.

In order to address the above problem, for example, Japanese patent application publication No. 9-67843 has disclosed a kind of method, and this method changes the output of recording laser, is recorded in pit width on the CD with change, thus with intrinsic code record on CD.

For example, first example is a well-known method, and this method is encrypted the tracer signal on the CD according to the described method of above-mentioned patented claim, and the key information that will decipher usefulness is recorded as the variation of pit width.Comprise that one reproduces device, can detect the above-mentioned key information that is recorded thus, and according to detected key information to password to decipher.Because on pirated CDs, there is not recording key information, thereby can not be to password to decipher, the content of CD can not normal reproduction.Therefore, if transcriber such as above-mentioned structure, then pirated CDs become useless, thereby can stop pirated copy basically.

The method that two kinds of well-known manufacturing pirated CDs are arranged now; A kind of method is to offer record cell same as before from the reproducing signal of CD; Another kind method is to transmit the physical arrangement of CD same as before.Make the pirated CDs that reproducing signal is offered same as before record cell if use the CD of making according to above-mentioned first example, though the information that the version with " pit/no pit " can be write down is recorded on the pirated CDs so, does not write down the key information with pit width version record on pirated CDs.Therefore, by adopting the method for above-mentioned first example, might stop manufacturing reproducing signal to be offered same as before the pirated CDs of record cell.Yet if will be used for making the pirated CDs of the physical arrangement that transmits CD same as before according to the CD that above-mentioned first example is made, the key information that writes down with the pit width version also records on the pirated CDs.Therefore, can not stop manufacturing is the shortcoming of the first routine method based on the pirated CDs that physics transmits.

Now, second example is the well-known method that addresses this problem.In second example, be not form recording key information, but the form that changes with the rate of penetrating write down this information with physical arrangement.In detail, in zone, form a groove, intense laser beam is shone on the reflectance coating in this district, thereby change reflection characteristic such as the CD draw-out area, and the record information identical with a bit string.

If with the form recording key information of reflectance varies, then key information is the form record that changes with the reflection characteristic of reflectance coating.Because key information is not with the form of physical arrangement (hole) record, so when transmitting the manufacturing pirated CDs according to physics, key information will not duplicate thereon.Therefore, this method has been remedied the weak point of first example, might stop employing to make pirated CDs by the physics transfer approach.

But second example also has shortcoming, if make CD by the method that will offer record cell from the reproducing signal of CD same as before, the key information that then is recorded on the draw-out area is duplicated same as before.

The whole bag of tricks of the prevention pirated CDs of being advised as mentioned above, is only effective to a kind of method in two kinds of methods of the manufacturing pirated CDs of being advised here.In addition, if make pirated CDs according to the top method of not described, these methods are invalid fully.

Summary of the invention

In this case, the purpose of this invention is to provide the apparatus and method that are used to make CD, can not make pirated CDs with these apparatus and method by the method that reproducing signal is directly offered the method for record cell and physically transmit compact disk structure, thereby get rid of traditional pirate weak point of reproducing; And the method that the CD of using this anti-piracy reproduction is provided and is provided for the CD of using this anti-piracy reproduction is reproduced.

In addition, also might get rid of bootlegging by using these data, to reproduce with the optical pick-up of reproducing audio data if can write down various data, and aspect the reproduction of the voice data of pit string, be difficult to bootlegging and without any adverse influence.

Thereby another object of the present invention provides a kind of CD, a kind of video disc recording unit, a kind of compact disk recording method, a kind of optical disc reproducing apparatus and a kind of reproducting method, described method can write down various data of forbidding bootlegging, thereby can reproduce with the optical pick-up that reproduces the voice data that writes down with the pit string form, and as with pit string the reproduction of voice data of format record aspect, be difficult to bootlegging and without any adverse influence.

In order to solve above-mentioned traditional problem, according to a first aspect of the invention, (this CD has the numerical data that has write down to be used to make CD, can read by the irradiation of laser beam) optical disk manufacturing device comprise: ciphering unit is used for according to a plurality of key informations input digital data being encrypted; The compact disc substrate maker is used to make compact disc substrate, and on described substrate, the form that changes with physical arrangement writes down encrypted numerical data and key information; Reflectance coating forms the unit, is used for forming reflectance coating on the substrate of CD; And key information recording unit, be used for that recording key information on the compact disc substrate of reflectance coating is being arranged.

According to a first aspect of the invention, ciphering unit is encrypted input digital data according to a plurality of key informations; The compact disc substrate maker is made compact disc substrate, and on described substrate, the form that changes with physical arrangement writes down encrypted numerical data and key information; Reflectance coating forms the unit and form reflectance coating on the substrate of CD; And key information recording unit is having recording key information on the compact disc substrate of reflectance coating.

According to a first aspect of the invention, (this CD has the numerical data that has write down to be provided for making CD, can read by the irradiation of laser beam) optical disk manufacturing device comprise: ciphering unit is used for according to a plurality of key informations input digital data being encrypted; The compact disc substrate maker is used to make compact disc substrate, and on described substrate, the form that changes with physical arrangement writes down encrypted numerical data and key information; Reflectance coating forms the unit, is used for forming reflectance coating on the substrate of CD; And key information recording unit, be used for that recording key information on the compact disc substrate of reflectance coating is being arranged.

Second aspect of the present invention provides above-mentioned optical disk manufacturing device, and wherein, compact disc substrate manufacturing cell comprises: exposing unit is used for according to encrypted numerical data and key information laser beam being focused at and makes the original disc exposure on the CD; Pressing mold forms the unit, is used for forming pressing mold by handling in applied chemistry on the original disc of exposure, thereby changes physical arrangement thereon; And reproduction units, the physical arrangement that is used to be transmitted on the pressing mold changes, thereby produces a plurality of compact disc substrates.

The 3rd aspect of the present invention provides above-mentioned optical disk manufacturing device, and wherein, exposing unit comprises: the laser beam intensity modulating unit is used for according to encrypted modulates digital data intensity of laser beam; And laser beam converged position change unit, be used for converged position according to key information change laser beam.

The 4th aspect of the present invention provides above-mentioned optical disk manufacturing device, and wherein, the laser beam intensity change unit comprises: modulating unit is used for producing modulation signal according to encrypted numerical data; The optical modulation unit is used for the on/off according to modulation signal control laser beam.

The 5th aspect of the present invention provides above-mentioned optical disk manufacturing device, and wherein, key information recording unit comprises: the laser beam generation unit that is used to produce laser beam; The light intensity modulation unit is used for according to the key information modulating lasering beam; And convergence unit, be used for modulated laser beam assembled and be radiated at the precalculated position on the CD.

The 6th aspect of the present invention is provided for making CD, and (this CD has the numerical data through record, can read by the irradiation of laser beam) optic disc producing mehtod, comprise: encrypting step is used for according to a plurality of key informations input digital data being encrypted; The compact disc substrate manufacturing step is used to make compact disc substrate, write down thereon with the physical arrangement version through encrypted digital data and key information; Reflectance coating forms step, is used for forming on compact disc substrate reflectance coating; And the key information recording step, be used for recording key information on the substrate that forms reflectance coating.

The 7th aspect of the present invention provides above-mentioned optic disc producing mehtod, and wherein, the compact disc substrate manufacturing step comprises: step of exposure is used for according to encrypted numerical data and key information laser beam being focused at CD, so that the original disc exposure; Pressing mold forms step, is used for handling to change the physical arrangement on it in applied chemistry on the original disc of exposure; And the reproduction step, the physical arrangement that is used to be transmitted on the pressing mold changes, thereby produces a plurality of compact disc substrates.

The 8th aspect of the present invention provides above-mentioned optic disc producing mehtod, and wherein, the key information recording step comprises: the laser generation step that is used to produce laser beam; Modulation step is used for according to the key information modulating lasering beam; And laser irradiation step, be used on compact disc substrate, assembling and illuminating laser beam.

The 9th aspect of the present invention provides a kind of CD, it has the numerical data with physical arrangement version record, so form, thereby reproduce numerical data by incoming laser beam from the reflection of its reflectance coating, wherein, digital signal is encrypted according to a plurality of key informations, one in a plurality of key informations form that changes with physical arrangement is recorded on the CD, and a reflectance varies form with reflectance coating to a plurality of key informations of major general is recorded on the CD.

The of the present invention ten aspect provides a kind of optical disc replay method, be used to reproduce and have the CD that writes down encrypted numerical data, wherein, described method comprises: first reproduces step, is used to reproduce with the physical arrangement version be recorded in first key information on the CD; Second reproduces step, is used to reproduce with the reflectance varies form be recorded in second key information on the CD; And decryption step, be used to reproduce the numerical data that is recorded on the CD and pass through to use of the numerical data deciphering of first and second key informations reproducing.

The of the present invention ten aspect is applied to a kind of optical disc apparatus or compact disk recording method, result and tracer signal according to rim detection, the beam intensity that shines the recording laser bundle on the CD raises off and on, change the reflectivity of CD partly, therefore when the folded light beam reception result passes through predetermined reference intensity, changed regularly.

In the present invention who is applied to a kind of CD, reflectivity changes partly, thereby the folded light beam reception result that obtains from scanning laser beam on pit and mark has shake, changes the data that record is additional according to local reflectance.

When the folded light beam reception result by predetermined reference intensity changes, intermittence ground raises and shines the beam intensity of the recording laser bundle on the CD, change the reflectivity and the timing of CD partly, thereby reproduced additional data rather than unlawfully reproduced CD, write down such as additional datas such as CD authentication codes, by handling and reproducing signal reproduces additional data, with in the data reproduction of pit or indicia patterns form record without any to the reproduction adverse influence.

In the present invention who is applied to a kind of CD, reflectivity changes partly, thereby the folded light beam reception result that obtains from scanning laser beam on pit and mark has shake, change according to local reflectance, the data that record is additional, thereby reproduced additional data rather than unlawfully reproduced CD, write down such as additional datas such as CD authentication codes, by handling and reproducing signal reproduces additional data, with in the data reproduction of pit or indicia patterns form record without any to the reproduction adverse influence.

In addition, according to other invention of the present invention, when being applied to a kind of optical disc apparatus or compact disk recording method, produce homophony system signal according to master data, make laser beam irradiation on CD according to homophony system signal, thereby form pit string or mark string thereon, thereby produce sub-modulation signal and make the point of irradiation of laser beam be partial to the inside/outside district of CD according to sub-modulation signal.

In addition, according to the present invention, when being applied to a kind of CD, if according to the length of pit or mark with along the record master data of the time interval between trajectory direction pit or the mark, so just according to pit or mark inside from the center of track/the deviation recording sub-data of outskirt.

In addition, according to the present invention, when being applied to a kind of optical disc apparatus, the output bias detection signal is handled with reference to reproducing signal then, thus the subsignal that reproduces with pit or mark from the center of track be benchmark inwardly/the form record of the deviation of outskirt.

According to structure according to optical disc apparatus of the present invention, if produce homophony system signal and form pit string or mark string with laser radiation according to homophony system signal according to master data, produce sub-modulation signal and according to the point of irradiation of this sub-modulation signal according to subdata towards the direction in the inside/outside district of CD skew laser beam, therefore can be used in the selection recording sub-data of the deviation in the inside/outside district so, not disturb reproduction with the master data of the form record of pit or mark.Subdata is recorded as prevent bootlegging and reproduces together to forbid illegal reproduction or the like with the data of the optical pick-up that reproduces master data and other various distribution.

According to structure according to CD of the present invention, if according to the length of pit or mark with along the record master data of the time interval between trajectory direction pit or the mark, is the deviation recording sub-data of benchmark to the inside/outside district of CD according to pit or mark with the center of track, can correctly reproduce master data with pit or mark to the selection of the deviation in the inside/outside district of CD so.In addition, can recording sub-data and be difficult to unlawfully reproduce, reproduce together to forbid illegal reproduction or the like with the data of the optical pick-up that reproduces master data and other various distribution.

In addition, according to structure according to optical disc reproducing apparatus of the present invention, if output bias signal and handle with reference to reproducing signal, thereby be benchmark reproduces subdata from record to the deviation in the inside/outside district of CD with the center of track according to pit or mark, and from as the CD of above-mentioned structure can reproduce master data as pit string or mark string, similarly, with can be from same optical disc replay towards the subdata of the form record of the pit in the inside/outside district of CD and mark deviation.The level basis of deviation detection signal changes towards the pit in the inside/outside district of CD and the deviation of mark.

In addition, composition according to optical disc replay method, if reproduce the master data that writes down with pit string and mark string form with the folded light beam that is radiated at the laser beam on the CD, reproduce with pit and mark subdata with the folded light beam of identical laser beam to the form record of the deviation in the inside/outside district of CD, so can from optical disc replay advocate peace the son two kinds of data, described CD has the data of the various records that are used to forbid bootlegging, therefore can reproduce with the optical pick-up that is used to reproduce with the data of forms such as pit string record, and be difficult to bootlegging.

Description of drawings

Fig. 1 is a block scheme, illustration be used to make the device of CD according to an embodiment of the invention.

Fig. 2 is a block scheme, and the cutting machine that provides for optical disk manufacturing device shown in Figure 1 is provided.

Fig. 3 A to the 3D illustration CD according to an embodiment of the invention; A is the skeleton view of CD; B is the synoptic diagram of boot section; C is the synoptic diagram of data field; And D is the synoptic diagram of draw-out area.

Fig. 4 is a block scheme, illustration according to the transcriber that is used to reproduce CD of the embodiment of the invention.

Fig. 5 is a process flow diagram, and the working condition of the system controller that provides for the transcriber that is used to reproduce CD shown in Figure 4 is provided.

Fig. 6 is a block scheme, shows the optical disc apparatus that is used to handle the CD CD according to one embodiment of the invention.

Fig. 7 A is the sectional view and the timing diagram of CD CD to 7E, and described CD CD is handled by optical disc apparatus shown in Figure 6.

Fig. 8 A-1 is the work timing figure of CD shown in Figure 6 to 8J-2.

Fig. 9 is a block scheme, shows delay circuit, edge detect circuit and the modulation circuit of optical disc apparatus shown in Figure 6.

Figure 10 is a block scheme, shows a CD player, and it is used to reproduce the CD CD by using optical disc apparatus shown in Figure 6 to write down.

Figure 11 is a block scheme, shows the CD authentication code reproducing circuit of CD player shown in Figure 10.

Figure 12 is a block scheme, shows the optical disc apparatus that is used to produce CD according to one embodiment of the invention.

Figure 13 is a block scheme, and the key modulation circuit that provides for optical disc apparatus shown in Figure 12 is provided.

Figure 14 is the work timing figure of key modulation circuit shown in Figure 13.

Figure 15 is the block scheme of optical disc apparatus, and described optical disc apparatus is used for reproducing from optical disc data, and described CD is by using optical disc apparatus shown in Figure 12 to produce.

Figure 16 is a block scheme, and the key modulation circuit that provides for optical disc apparatus shown in Figure 15 is provided.

Figure 17 is the work timing figure of key modulation circuit shown in Figure 16.

Embodiment

(1-1) structure in one embodiment

Below, with reference to the accompanying drawings, will describe the apparatus and method of making CD according to one embodiment of the invention in detail, and CD.

At first, with reference to figure 1, describe according to an embodiment of the invention, be used to make the apparatus and method of CD.In the present embodiment, the device that is used to make CD is the device that is used to make CD CD (CD).In Fig. 1, digital audio tape recorder is reproduced the digital audio and video signals SA that comes out offer first encrypted circuit 22 from tape, and digitized audio message SA is encrypted according to the first key information signal KY1 that the first key information generation circuit 24 provides.To offer second encrypted circuit 23 from the encrypted digital audio and video signals SB of first encrypted circuit 22, and signal SB be encrypted according to the second key information signal that the second key information generation circuit 25 provides.Will be from second encrypted circuit 23 offer compact disc substrate manufacturing cell 2 through the digital audio and video signals SC of double-encryption with from the second key information signal KY2 of the second key information generation circuit 25, to make compact disc substrate, the form record of cheating with male-female on described substrate is through the digital audio and video signals SC and the second key information signal KY2 of double-encryption.

In the cutting machine 3 that provides for compact disc substrate manufacturing cell 2, the second key information signal KY2 that the digital audio and video signals SC and the second key information generation circuit 25 through double-encryption that provides with second encrypted circuit 23 provides comes modulating lasering beam, and original disc 26 is exposed under modulated laser beam.

By developing and electroplating unit 27,, thereby obtain pressing mold 28 through the original disc 26 process developing process and the electroplating technologies of exposure.Pressing mold 28 is arranged on the injector 29, and the plastic material that is formed compact disc substrate 4 by 29 pairs of injectors such as polycarbonate etc. carries out mold pressing.With the form of minimum male-female (pit), will be recorded on the above-mentioned compact disc substrate 4 through the digital audio and video signals SC and the key information signal KY2 of double-encryption.

Then, form unit 41 by reflectance coating and on compact disc substrate 4, form reflectance coating, thereby obtain the CD 5 of semi-manufacture.On semi-manufacture CD 5, with the form in male-female hole, record is through the digital audio and video signals SC of double-encryption with from the second key information signal KY2 of the second key information generation circuit 25, and the reflectance coating that is used in reflection lasering beam is formed at the opposite of pit.But, be not recorded on the semi-manufacture CD 5 from the first key information signal KY1 of the first key information generation circuit 24.Therefore, can not reproduce music,, can not in statu quo decipher by the encryption that first encrypted circuit 22 carries out because when installing to semi-manufacture CD 5 in the CD player through record.

At last, semi-manufacture CD 5 is installed in the CD-R record cell 7.In CD-R record cell 7, to offer computing machine 6 from the first key information signal KY1 of the first key information generation circuit 24, order in response to computing machine 6, accept a visit in the district that does not have user data (draw-out area), and addition record is from the first key information signal KY1 of the first key information generation circuit 24.By the information signal of CD-R record cell 7 addition records is that described reflectance coating forms the unit by reflectance coating and forms with the form record of the reflectance varies of reflectance coating.

On the CD CD of finishing as mentioned above (finished product CD) 8, write down the second key information signal KY2, from first key information signal KY1 of the first key information generation circuit 24 and the reproducing audio signal that obtains from digital audio tape recorder 21 from the second key information generation circuit 25.When reproducing music data of being recorded on the CD CD 8 etc. with following optical disc reproducing apparatus, might obtain the first key information signal KY1 and the second key information signal KY2 from CD CD 8, can decipher double-encryption, and the user can be under as the equal state of traditional C D CD music appreciating.

First encrypted circuit 22 is according to the DES code, and the first key information signal KY1 that generates according to the first key information generation circuit 24 encrypts digital audio and video signals SA, and generates encrypted digital audio and video signals SB.Here, the DES code is the abbreviation of data encryption standards.This is widely used a kind of encryption method.Equally, second encrypted circuit 23 is according to the DES code, and the second key information signal KY2 that generates according to the second key information generation circuit 25 deciphers digital audio and video signals SB, and generates the digital audio and video signals SC through double-encryption.

When cutting one new CD, the first key information generation circuit 24 and the second key information generation circuit 25 produce the first key information signal KY1 and the second key information signal KY2.The circuit that becomes known for producing this key information signal comprises: for example, and a LFSR (linear feedback shift register).

Next, with reference to figure 2, the structure of cutting machine 3 shown in Figure 1 is described.As mentioned above, under the exposure of laser beam, usefulness cutting machine 3 writes down the digital audio and video signals SC and the second key information signal KY2 through double-encryption on original disc 26.The data handling procedure of modulation circuit 31 usefulness CD CD special uses is handled the digital audio and video signals SC through double-encryption, thereby produces EFM signal SD, and it is outputed to photomodulator 35.In more detail, will handle through staggered then through the digital audio and video signals SC and the error correction signal addition of double-encryption, the EFM modulation produces EFM signal SD.Modulation circuit 31 inserts sub-code data in the subcode district of EFM signal SD, and wherein TOC (contents table) the subcode generator that is provided by the subcode maker, not shown subcode maker in the accompanying drawing are provided sub-code data.

32 pairs second key information signals of modulation circuit KY2 carries out FM-modulation, and with it as analog wave key information modulation signal KYD, output to photomodulator 34.(for example, MD (compact disk) the used principle of) address information is identical, and it describes omission in detail for the principle of FM modulation and recording disk.In the FM modulation, embed a clock signal or a similar signal, so that for example can from key information modulation signal KYD, recover key information signal KY2.

Modulation circuit 32 is by system controller setting not shown in the figures, so it is only just worked when the do cutting of 3 pairs of boot sections of cutting machine.Therefore, the time durations in cutting machine 3 cutting data districts and draw-out area, key information modulation signal KYD keeps constant voltage, and photomodulator 34 modulation signal not.

Spindle Motor 38 makes original disc 26 rotations.Spindle servo circuit 39 control Spindle Motors.In fact, at each predetermined rotation angle place, the FG signal that output signal level rises.The FG signal is by FG signal generator (not shown) output that is positioned at Spindle Motor 38 bottoms.Spindle servo circuit 39 drive shaft motors 38 are so that arrive predetermined frequency with the frequency adjustment of FG signal.As mentioned above, original disc 26 is with predetermined rotating speed rotation.

Recording laser source 33 is transmitted into photomodulator 34 and photomodulator 35 with laser beam L1.Recording laser source 33 comprises: for example, and gas laser.Photomodulator 34 and photomodulator 35 comprise electricity-sound-optical element or like.The key information modulation signal KYD that photomodulator 34 provides according to modulation circuit 32 changes the direction of propagation by recording laser source 33 emitted laser bundles.In other words, photomodulator 34 penetrates the laser beam L2 of emission angle varied slightly according to the level of key information modulation signal KYD.Generally this modulation to the laser beam emission angle is used for AOD (acoustooptic deflector).

The direction of propagation is added on the photomodulator 35 by the laser beam L2 that key information modulation signal KYD changes, and the EFM that provides corresponding to modulation circuit 31 (eight to 14 modulation) signal SD, by photomodulator 35 it is carried out on, and emission becomes laser beam L3.

Catoptron 36 is along such light path direction reflection lasering beam L3, and its reflection angle is for example spent for 26 one-tenth 90 with original disc.Object lens 37 will be focused on the record surface of original disc 26 from the folded light beam of catoptron 36.So that the form that convergent beam point occurrence positions departs from, the variation (corresponding to key information modulation signal KYD) of the direction of propagation of catoptron 36 laser light reflected bundle L3 is recorded on the CD.

Threading device (not shown) radially with the synchronous rotation of original disc 26, mobile mirror 36 and object lens 37 length by length.As mentioned above, the converged position of laser beam L3 moves step by step, for example, moves to outskirt from the inner region of original disc 26, thereby form spiral trajectory on original disc 26.Corresponding to EFM signal SD, on track, form pit continuously.As mentioned above, because modulate the direction of propagation of 34 couples of laser beam L2 of photomodulator and L3, make the center that is formed on the pit string on the boot section corresponding to key information modulation signal KYD, relevant path is made lateral excursion.

Original disc 26 is exposed in the laser beam L3 that is modulated by the digital audio and video signals SC and the second key information signal KY2 through double-encryption.

As shown in Figure 1, original disc 26 process developing process and the electroplating technologies through exposure form pressing mold 28.Pressing mold 28 is arranged on the injector 29, forms by the compact disc substrate 4 that forms such as plastic materials such as polycarbonate.On compact disc substrate 4, form reflectance coating, obtain on the semi-manufacture CD 5.At last, semi-manufacture CD 5 is installed in the CD-R record cell 7.In CD-R record cell 7, in response to the order of computing machine 6, visit does not have the zone (draw-out area) of user data, and addition record is from the first key information signal KY1 of the first key information generation circuit 24.Addition record is that described reflectance coating forms machine 41 by reflectance coating and forms with the form record of the reflectance varies of reflectance coating at the information signal of CD-R record cell.

Basically, CD-R record cell 7 has similar structure to CD-R available on the market unit, except the CD-R unit is made into to visit the draw-out area.

Fig. 3 A schematically shows the CD CD of finishing as mentioned above 8.As shown in Figure 3A, CD CD 8 is divided into three districts.Innermost circumferential area is boot section (importing) LI, and zone line is data field DA, and outmost zone is draw-out area (drawing) LO.

On the LI of boot section, record is used to visit the TOC information and the second key information signal KY2 of CD CD 8.Fig. 3 B illustration when with the microscopic examination boot section resulting synoptic diagram, wherein, with the form record TOC information of pit.The center of each pit is the center of off-track slightly, writes down the second key information signal KY2 with the form that departs from.

Data field DA is used to write down the digital audio and video signals SC through double-encryption.When with microscopic examination this when zone, can find that through the digital audio and video signals SC of double-encryption be with the form record of pit, for example, shown in Fig. 3 C.Because the second key information signal KY2 is not write down in the data field, so the position non-migration of each pit.

On the LO of draw-out area, by the CD-R record cell 7 records first key information signal KY1.When with microscopic examination this when zone, can find that the first key information signal KY1 is with the form record of reflectance varies, for example, shown in Fig. 3 D.Much less, this information does not write down as physical change (recessed-protruding).

For example, suppose that a pirated CDs fabricator obtains the as above CD CD 8 of manufacturing, attempt to make pirated CDs by offering cutting machine from the reproducing signal that CD CD 8 obtains.As a result, all offered cutting machine with being recorded in the TOC information of boot section LI, the information of data field and the information of draw-out area, and be recorded on the pirated CDs.Yet the second key information signal KY2 that the form that departs from each groove position is recorded on the LI of boot section does not occur in reproducing signal, therefore is not recorded on the pirated CDs.Owing to use the pirated CDs of making in the above described manner not decipher, so impossible reproducing music signal etc. to the second key information signal KY2.Therefore, pirated CDs is of no use, and the use by said method, has stoped the manufacturing of pirated CDs.

Next, suppose that a pirated CDs fabricator obtains the as above CD CD 8 of manufacturing, attempt to transmit the method for pit and make pirated CDs by physics.In this case, the second key information signal KY2 that will be recorded in the form of position deviation probably on the LI of boot section in statu quo is sent on the pirated CDs.But the first key information signal KY1 that is recorded in draw-out area LO is with the form of reflectance varies record, thereby does not cause the male-female of physics.Therefore, the first key information signal KY1 is not sent on the pirated CDs.Owing to use the pirated CDs of making in the above described manner can not the encrypted result of the first key information signal KY1 be decrypted, so can not reproduce.Therefore, pirated CDs is of no use, by the use of said method, has stoped the manufacturing of pirated CDs.

As mentioned above, according to embodiments of the invention, any method by in method that transmits CD with physics mode and the method that directly reproducing signal is offered cutting machine might prevent the manufacturing of pirated CDs.

Below, with reference to figure 4, the transcriber 50 of the CD CD that is used to reproduce as above manufacturing is described.

Transcriber 50 shown in Figure 4 is subjected to the control of system controller 64.Spindle Motor 51 rotates CD CD 8.Servo circuit 52 control Spindle Motor 51 and optical pick-ups 53, the operation of being scheduled to thus.The reproduction RF signal that optical pick-up 53 is produced offers binarization circuit 54.To offer A/D converter 61 from the push-pull signal PP of optical pick-up 53.

The binarization circuit is compared the reproduction RF signal that is provided with predetermined cut-off level, thereby produces a binary signal.Binary signal is offered EFM demodulator circuit 55.EFM demodulator circuit 55 demodulates EFM from binary signal, thereby produces 8 signals, and 8 signals that produced are offered ECC (error correction circuit) circuit 56.

The ECC (error correction codes) that ECC circuit 56 increases according to coding during writing down proofreaies and correct the error in the output of EFM demodulator circuit 55.This error be because, for example, the defective of CD CD 8 causes.

On the other hand, A/D converter 61 makes push-pull signal digitizing (quantification), and it is offered DSP62, as digital reproduction signal DRF.Because push-pull signal PP is proportional to the position deviation at pit relevant path center, so push-pull signal comprises the information that is registered as the second key information signal KY2.DPS62 carries out the digital signal processing processor, and it handles digital reproduction signal DRF according to being recorded in inner program, and demodulation is carried out in the FM modulation of being modulated by modulation circuit 32, thereby tries to achieve the second key information signal KY2.

57 pairs of encryptions of first password processing circuit are decrypted, and described encryption is the output signal that is applied to ECC circuit 156 by the as above use of the determined second key information signal KY2.Second information of encrypting (by second encryption circuit encrypts shown in Figure 1) that will therefrom decrypt one after the other offers second cryptographic processing circuit 58.Simultaneously, will also offer storer 63 from the signal of ECC circuit 56.System controller 64 control stores 63 are stored in the first key information signal KY1 in the storer 63.As a result, the first key information signal KY1 that is stored in the storer 63 is offered second password processing circuit 58, therefore second password processing circuit 58 can be decrypted first encryption (being encrypted by first encrypted circuit 22 shown in Figure 1).

Owing to as mentioned above coded signal is decrypted, institute so that digital audio and video signals SA in the output place recovery of second password processing circuit 58.Resulting as mentioned above digital audio and video signals SA converts simulated audio signal to by D/A converter 59, and delivers to output terminal 60, offers loudspeaker or similarly is used for the device of sounding.

Finish above-mentioned decryption oprerations by system controller 64.System controller 64 is so constructed, and when having loaded a new CD 8, by the operation shown in the transcriber 50 execution process flow diagram as shown in Figure 5, thereby realizes decryption processing consistently at every turn.

In the processing of finishing by system controller shown in Figure 5 64, at first, in step ST-1, system controller 64 provides each parts of ordering system, comprise servo circuit 52, instruction moves to the boot section LI of CD 8 from optical pick-up emitted light beams focus.Secondly, in step ST-2, quantize by A/D converter 61 from the push-pull signal PP of optical pick-up 53, and handle by DSP62, thereby to the information decoding as second key information signal KY2 record.Then, in step ST-3, will offer the output terminal of DSP62 through the second key information signal KY2 of decoding, and keep this value.

In step ST-4, system controller 64 orders move to draw-out area LO with optical pick-up emitted light beams focus.Then, in step ST-5, the first key information signal KY1 that system controller 64 instructions will be read is stored in the storer 63.As mentioned above, obtained the first key information signal KY1 and the second key information signal KY2, then, system controller 64 control total systems so that reproduce data from CD CD 8, are sounded.

As mentioned above, system controller 64 control total systems so that playback record is at the key information of boot section LI and draw-out area LO, and to password to decipher, produce sound then.As a result, can prevent from when loudspeaker produces big noise sound, encryption not to be decrypted.

At CD CD 8 is that the first and second key information signal KY1 and KY2 are correctly decoded under the situation of normal CD (not being pirated CDs).As a result, first and second password processing circuits 57 and 58 can obtain deciphering needed information.Therefore, the output of second password processing circuit 58 is offered D/A converter 59, convert the output of D/A converter 59 to for example music signal, the user can appreciate the music that is recorded on the CD CD 8 thus.

Reproduce the device of making CD by the present invention obtain CD and once more reproducing signal is offered cutting machine in order to the situation of making pirated CDs under, pirated CDs is not with the second key information signal KY2 of the position deviation form record of pit.Therefore, when attempting to reproduce pirated CDs with optical disc reproducing apparatus shown in Figure 4, the user can not be from pirated CDs music appreciating so.Obtaining under the situation of pirated CDs by the method with the physical arrangement that transmits CD as previously mentioned, the user can not music appreciating.

In the above-mentioned example of present embodiment, be that the present invention is not limited only to this situation with the position deviation form record of pit though described the second key information signal KY2; For example, can write down the second key information signal KY2 with the form that pit width changes a little.In this case, for optical disc reproducing apparatus, do not need to be used to detect the optical detection system of push-pull signal, this has simplified the structure of optical disc reproducing apparatus and has reduced cost.

(1-2) effect of the foregoing description

According to of the present invention first to the 5th aspect, comprising because be used to make the optical disk manufacturing device of CD (CD has the numerical data through record that will be read by the irradiation of laser beam): ciphering unit is used for according to a plurality of key informations input signal being encrypted; Compact disc substrate manufacturing cell is used to make compact disc substrate, and the form that changes with physical arrangement writes down encrypted numerical data and key information thereon; Reflectance coating forms the unit, is used for forming on compact disc substrate reflectance coating; And key information recording unit, be used for having recording key information on the compact disc substrate of reflectance coating; So can obtain presenting the optical disk manufacturing device of following effect.In detail, according to of the present invention first to the 5th aspect, because come recording key information with two kinds of diverse ways (being the reflectance varies of physical arrangement variation and reflectance coating), so not only transmit and can not the CD with manufacturing installation manufacturing of the present invention be reproduced by physics, and directly offer cutting machine by the reproducing signal that CD reproduced out with manufacturing installation manufacturing of the present invention, can not obtain pirated CDs.Therefore, according to the optical disk manufacturing device of of the present invention first to the 5th aspect, made the CD of protection copyright owner rights and interests.

According to the of the present invention the 6th to the 8th aspect, because being used to make the optic disc producing mehtod of CD (CD has the numerical data through record that will read by illuminating laser beam) comprising: encrypting step is used for according to the signal encryption of a plurality of key informations to input; The compact disc substrate manufacturing step is used to make compact disc substrate, and the form that changes with physical arrangement is recorded in encrypted numerical data and key information on the compact disc substrate; Reflectance coating forms step, is used for forming on compact disc substrate reflectance coating; And the key information recording step, be used for having recording key information on the compact disc substrate of reflectance coating; So obtain presenting the optic disc producing mehtod of following effect.In detail, according to the of the present invention the 6th to the 8th aspect, not only transmit and can not the CD with optic disc producing mehtod manufacturing of the present invention be reproduced by physics, and utilize following method can not obtain pirated CDs, in described method, directly offer cutting machine with reproducing the reproducing signal that comes out on the CD of optic disc producing mehtod manufacturing of the present invention.The optic disc producing mehtod of the 6th to the 8th aspect according to the present invention has been made the CD of protecting copyright owner's rights and interests.

According to a ninth aspect of the present invention, because CD has the numerical data with physical arrangement version record, and by its reflectance coating reflection incoming laser beam, reproduce numerical data, wherein, digital signal is encrypted according to a plurality of key informations, and one in a plurality of key informations form that changes with physical arrangement is recorded on the CD, and a reflectance varies form with reflectance coating to a plurality of key informations of major general is recorded on the CD, thereby obtains presenting the CD of following effect.In detail, according to a ninth aspect of the present invention, because according to a plurality of key informations to being recorded in the digital data encrypt on the CD, one in a plurality of key informations form that changes with physical arrangement is recorded on the CD, and a reflectance varies form with reflectance coating to a plurality of key informations of major general is recorded on the CD, so not only transmit and to duplicate the CD of ninth aspect present invention by physics, and utilize following method can not obtain pirated CDs, in described method, will directly offer cutting machine from the reproducing signal that optical disc replay of the present invention comes out.Therefore, the optic disc producing mehtod of the 9th aspect according to the present invention can be made the CD of protecting copyright owner's rights and interests.

According to a tenth aspect of the present invention, because the invention provides a kind of optical disc replay method, (CD is with physical arrangement version record numerical data from CD for this method, the sense data so that pass through its reflectance coating of laser beam irradiation) reproduces data in, wherein, digital signal is encrypted according to a plurality of key informations, one in a plurality of key informations form that changes with physical arrangement is recorded on the CD, and a reflectance varies form with reflectance coating to a plurality of key informations of major general is recorded on the CD, so obtain presenting the optical disc replay method of following effect.In detail, according to a tenth aspect of the present invention, can obtain being used for to being recorded in correct deciphering of data on the CD and the optical disc replay method that reproduces, even CD is subjected to pirate protection by encryption.

(2-1) structure among another embodiment

Fig. 6 is the block scheme of optical disc apparatus according to an embodiment of the invention.Optical disc apparatus 1 is recording disk authentication code ED on CD CD 2, in CD CD manufacture process, with the form of pit string, has write down digital audio and video signals on the CD CD.

In detail, as shown in Figure 7, use,, use the method identical to make the compact disc substrate 3 (being shown in Fig. 7 D) of CD CD 2 with making common CD CD by the pressing mold injection molding such as plastics such as polycarbonate.In injection molded process, on the information recording surface of compact disc substrate 3, form recessed-protruding fine structure corresponding to pit and island (LAND).As have shown in the zoomed-in view (Fig. 7 E) of arrow a; by methods such as for example hydatogenesiss, on the information recording surface of the compact disc substrate 3 of CD CD 2, be formed for the reflection record film 4 of reflection lasering beam; be formed for protecting the diaphragm 5 of reflection record film 4 then, to prevent corrosion.

With the used same procedure of common CD CD, on CD CD 2, with the pit of repetition and the form on island, record is used to specify the sub-code information absolute time that sound signal is reproduced the position, and laser beam L is shone on the reflection record film 4 by compact disc substrate 3, and the reception folded light beam, thereby reproduced sound signal that is recorded on the CD CD 2 etc.

With the used same procedure of common CD CD, for distributing 75CD frame (Fig. 7 A) in pit and island that the per second that as above forms repeats, and be each CD frame (Fig. 7 B) distribution 98EFM frame (Fig. 7 B).In addition, each EFM frame being divided into 588 channel clocks, is that the one 22 channel clock distributes a frame synchronization.The basic cycle that is made of pit and island structure is 1 cycle of 1 channel clock.Pit and island structure carry out repetition with the integral multiple length of this basic cycle, and frame synchronization was made up of the cycle of 11T.

In this embodiment, form reflectance coating 4, so that obtain the membrane structure identical with the information recording surface of CD-R.Therefore, when shining intensity on the CD CD 2 greater than the laser beam L of a certain intensity, on the position of laser beam irradiation, the reflectivity of reflection record film 4 is irreversibly changed, and with the form of the Strength Changes of folded light beam, variation that can the detection of reflected rate.

In optical disc apparatus 1 (Fig. 6), comprise the system, control circuit 10 control whole operation of microcomputer, and on CD CD people recording disk authentication code ED.

In optical disc apparatus 1, under the control of servo circuit 12, Spindle Motor 11 makes CD CD 2 with constant linear velocity rotation.

Optical pick-up 13A detects reproducing signal RF from CD CD 2 prior to optical pick-up 13B, and optical pick-up 13B is according to the result of the detected reproducing signal RF of optical pick-up 13A then, recording disk authentication code ED on CD CD 2.

In detail, optical pick-up 13A and 13B along the radial motion of CD CD 2, thereby are close to the ground illuminating laser beam by screw device connection at a moment on identical track.The reception result of the folded light beam that obtains according to illuminating laser beam on CD CD 2, optical pick-up 13A and 13B are in independently under the tracking Control and focus control, therefore, just in time after optical pick-up 13A scanning, optical pick-up 13B scans identical position.

Optical pick-up 13A receives folded light beam in predetermined element, and detects reproducing signal RF, and the signal level of described reproducing signal changes and changes corresponding to the beam intensity of the folded light beam on the receiving plane of receiving element.Under the control of APC (automated power control) circuit 14, the beam intensity of optical pick-up 13B rising laser beam under predetermined timing, thus change the reflectivity of the reflection record film 4 of CD CD 2 partly.

Amplifying circuit 15 amplifies the reproducing signal RF that is provided by optical pick-up 13A with predetermined gain, and with its output.Binarization circuit 16 makes the reproducing signal RF binarization that is provided by amplifying circuit 15 according to the predetermined reference level, and output binary signal BD.The PLL circuit reproduces channel clock CK from binary signal BD.

Delay circuit 22 makes constant time lag a period of time of binary signal BD, and exports delayed timing, and the described time period is the time of scanning same position from the time of a position of optical pick-up 13A scanning to optical pick-up 13B.

CD authentication code generation circuit 20 comprises subcode testing circuit 20A and ROM (read-only memory) (ROM) 20B.Subcode testing circuit 20A handles the binary signal DBD that has postponed the schedule time by delay circuit 22, thereby reproduces the subcode information that is included among the binary signal DBD.In addition, CD authentication code generation circuit 20 produces the temporal information of dividing (AMIN) and second (ASEC) selectively, these temporal informations respectively origin self-contained in subcode minute, second and the absolute time of frame represent.At that time, subcode testing circuit 20A also produces the reset pulse that is synchronized with second (ASEC) temporal information, and it is outputed to change-over circuit 21.

Here, the branch (AMIN) of Data Position and the temporal information of second (ASEC) are sub-code informations as the standard code of CD CD 2 on the expression CD CD.In other words, divide (AMIN) temporal information to represent, and value is by the data that minute are recorded on the CD CD 2, for example, from 0 to 74.Second (ASEC) temporal information will be carried out more accurate regulation by second by minute position to be divided into unit of (AMIN) regulation, and value is, for example, and from 0 to 59.

ROM (read-only memory) 20B preserves CD authentication code ED, and produces data, and these data are to preserve according to a branch (AMIN) and second (ASEC) temporal information from subcode testing circuit 20A.Here, CD authentication code ED is included in the id information that is provided with regularly in each CD, the information of manufacturing works, the data of manufacturing and the information that is used to control the permission reproduction, and further comprise synchronizing signal and the error correction codes that is used to indicate CD authentication code ED starting.ROM (read-only memory) 20B preserves CD authentication code ED as bit data, 1 CD authentication code ED is outputed to " 1 " address that is determined by minute (AMIN) and second (ASEC) temporal information.Therefore, for each second, ROM (read-only memory) 20B produces 1 CD authentication code ED.

In order to produce CD authentication code ED as mentioned above and with its output, in CD CD 2, shown in the comparison between Fig. 7 and Fig. 8, comprised the 75CD frame in 1 second, the 1CD frame comprises 98EFM frame (Fig. 8 (A-1) is to (A-3)), CD authentication code generation circuit 20 produces 1 CD authentication code ED (Fig. 8 D), and its unit is 7350 (7350=75 * 98) EFM frame, and with its output.Thereby CD authentication code generation circuit 20 produces and output CD authentication code ED, so that has 10 pit edge 1 corresponding to CD authentication code ED on the CD CD at least.

Change-over circuit 21 with reference to synchronizing pattern to CD authentication code ED scrambling, and with its output.Therefore be difficult to find CD authentication code ED.

In other words, in change-over circuit 21, synchronizing pattern testing circuit 21A detects synchronizing pattern, and this synchronizing pattern repeatedly appears among the binary signal DBD that is provided by delay circuit 22.At that time, the signal level of binary signal DBD is switched corresponding to the pit string that is formed on the CD CD, is distributing on the initial frame synchronization of every frame signal level rising a period of time 11T, signal level decline a period of time 11T then.

Therefore, reference channel clock CK (Fig. 8 B), by the application of multi-link trigger circuit, synchronizing pattern testing circuit 21A decision in succession and the signal level of the binary signal DBD that comes, thereby detect frame synchronization.In the present embodiment, synchronizing pattern testing circuit 21A produces frame pulse FP (Fig. 8 C), its signal level rises during period of time T, testing result according to frame synchronization, contrast with the timing of the binary signal DBD that will be handled by subcode testing circuit 20A, described period of time T is 1 channel clock before frame synchronization is initial.

Circuit 21B takes place and comprises a plurality of cascaded flip-flops and XOR circuit in M-series, it is according to the reset pulse from subcode testing circuit 20A, by the timing that changes corresponding to (ASEC) time second, in a plurality of triggers each is provided with initial value, with frame pulse the content adjoining land will be set then and synchronously transmit, and it will be fed back to predetermined intergrade, therefore produce M-series random number data MS, wherein, logic level 1 occurs with identical probability with 0.

XOR circuit 21C receives M-series of signals MS and CD authentication code ED, and produces the XOR signal, and this signal will be used as switching signal MD (Fig. 8 E).In detail, be that XOR circuit 21C produces switching signal MD according to the logic level of M-series of signals MS under 0 the situation in the logic of CD authentication code ED.On the other hand, be that XOR circuit 21C produces the opposite switching signal MD of logic level that has with M-series of signals MS under 1 the situation in the logic level of CD authentication code ED.Therefore, XOR circuit 21C modulates CD authentication code ED according to M-series random number.

According to the binary signal DBD that is provided by delay circuit 22, edge detect circuit 23 detects the timing of each pit edge that forms on CD CD 2, and with its output.Modulation circuit 24 is gating switching signal MD in the timing at this edge, thereby the control signal MX that is used in APC circuit 14 raises.Therefore the beam intensity of laser beam raises one and measures, so change the reflectivity of CD CD 2 partly.

In detail, as shown in Figure 9, by using the predetermined level of cascaded triggering device 22A to 22O, delay circuit 22 channel clock CK synchronously transmit binary signal BD continuously, have therefore postponed binary signal BD, and with delayed signal output.The progression of trigger 22A to 22O is set, causes because of transmitting to become time delay that binary signal gives binary signal BD to equal to scan time cycle time of same position to optical pick-up 13B from the time of a position of optical pick-up 13A scanning.

Edge detect circuit 23 offers the trigger 22A that works according to channel clock with the input signal of trigger 22O, and the I/O of trigger 23A is provided to "AND" circuit 23B.The input end of "AND" circuit 23B is arranged to reverse input end, so that when the logic level of two input ends is differing from each other, the logic level of output terminal is raise.When the logic level transition of binary signal BD, edge detect circuit 23 detects regularly, and the output signal of output "AND" circuit 23B, and this output signal is the testing result as edge detection signal EP (Fig. 8 F).

Modulation circuit 24 offers "AND" circuit 24A with edge detection signal EP and switching signal MD, thus according to edge detection signal EP gating switching signal MD, and produce switching signal MXA (Fig. 8 G), the logic level of switching signal MXA is raising on regularly corresponding to the pit edge of the logic level of switching signal MD.

D-trigger 24B according to channel clock CK work removes the gridge noise from modulation signal MXA, and output removes the signal MXA of denoising, univibrator (MM) 24C is to the pulse width shaping of the pulse signal of D-trigger 24B output, and output modulating pulse MX (Fig. 8 H).

APC circuit 14 (Fig. 6) is corresponding to beam intensity modulating pulse MX, and optical pick-up 13B emitted laser beam intensity is switched and recording beam intensity from used beam intensity again.Here, recording beam intensity is meant the beam intensity of the reflectivity of the reflectance coating that is enough to change CD CD 2.

The result, scan the timing at the edge of pit P at optical pick-up 13B emitted laser bundle, corresponding to CD authentication code ED according to random number data MS modulation, the beam intensity of optical disc apparatus 1 rising laser beam, form mark M in case across topped respective edges with recording disk authentication code ED (Fig. 8 I-1 and 8I-2) additionally.Therefore, in CD CD 2, do not having under the situation of recording disk authentication code ED additionally, obtain the reproducing signal RF of signal waveform, in described signal waveform, at the timing of these pit edge of scanning, signal level meet with average level approx (Fig. 8 J-1).On the other hand, under the situation of aforesaid additionally recording disk authentication code ED, obtain the reproducing signal RF of signal waveform, in described signal waveform, timing in the scanning pit edge, owing to change partly, so for the variation of reflectivity, signal level departs from partly at respective edges place reflectivity.Correspondingly, the variation of reflectivity makes shake increase (Fig. 8 J-2).According to from the detected shake of reproducing signal RF, recording disk authentication code ED on the CD CD 2, and, reproduce CD authentication code ED with reference to the signal level variation of reproducing signal RF.

In optical disc apparatus 1, setting is by the beam intensity of the laser beam of APC circuit 14 raisings, and the pulse width that modulating pulse MX is set, the time cycle that is raised beam intensity of this pulse-width controlled laser beam, so that use the reliability processing reproducing signal RF same, even the signal waveform of reproducing signal RF changes as described above with the traditional reproducting method that produces sound signal.In other words, with the nargin of enough phase places and amplitude reproducing signal RF is carried out scale-of-two and differentiate, thereby correctly produce channel clock CK.

Figure 10 is the block scheme that is used to reproduce the CD CD player of CD CD 2.In CD CD player 30, under the control of servo circuit 33, Spindle Motor 32 makes CD CD 2 with constant linear velocity rotation.

Optical pick-up 34 with laser beam irradiation to CD CD 2, and on predetermined receiving element, receive folded light beam, produce reproducing signal RF then, wherein the signal level of reproducing signal changes corresponding to the beam intensity of the folded light beam on the reception area on the receiving element.The signal level of reproducing signal RF changes corresponding to being recorded in each pit on the CD CD 2.At that time, according to the CD authentication code ED of record, the reflectivity of CD CD 2 changes partly corresponding to each pit edge, and corresponding to the reflectance varies owing to CD authentication code ED, therefore the signal level of reproducing signal RF changes slightly.

Binarization circuit 35 makes reproducing signal RF become scale-of-two with reference to the predetermined reference level, produces binary signal BD thus.

The PLL circuit is worked with reference to binary signal BD, therefore reproduces the channel clock CCK of reproducing signal RF.

EFM demodulator circuit 37 reference channel clock CCK, adjoining land latchs binary signal BD, thereby reproduces the data corresponding to EFM restituted signal S2.In addition, 37 pairs of EFM demodulator circuits reproduce data and carry out the EFM demodulation, and reference frame will be divided into 8-position section through demodulating data synchronously then, and to the 8-position signal deinterleave that each produced, and it is outputed to ECC (error correction codes) circuit 38.

According to the error correction codes in the output data that is added to EFM demodulator circuit 37, ECC circuit 38 makes output data through treatment for correcting, therefore reproduces and outputting audio data D1.

D/A switch circuit (D/A) 39 makes the voice data D1 from the ECC circuit handle through D/A switch, and output simulated audio signal S4.At this moment, under the control of system, control circuit 40, when detecting CD CD 2 and be the CD CD that illegally duplicates, D/A switch circuit 39 stops the output of sound signal S4.

System, control circuit 40 comprises the computing machine that is used to control 30 work of CD CD player.According to the CD authentication code ED from CD authentication code reproducing circuit 41, system, control circuit 40 determines whether CD CD 2 is the bootlegging CD.If determine the whether CD of bootlegging of CD CD, then system, control circuit 40 control D/A switch circuit 39 make it to stop the output of sound signal S4.

CD authentication code reproducing circuit 41 is decoded to CD authentication code ED from reproducing signal RF, and with its output.

Figure 11 is the detailed block scheme of CD authentication code reproducing circuit 41.In CD authentication code reproducing circuit 41, subcode testing circuit 42 reference channel clocks monitor binary signal BD, and from binary signal BD sub-code information are decoded.Subcode testing circuit 42 monitors the temporal information that is included in the decoding subcode, and produces 1 second detection pulse SECP, and whenever temporal information change 1 second, this signal level that detects pulse rose.

With reference to figure 9, the structural similarity of the structure of edge detect circuit 44 and above-mentioned edge detect circuit 23, it detects the change point of each pit from binary signal BD, and produces edge detection signal EP.

Synchronizing pattern testing circuit 45 reference channel clock CCK adjoining lands latch binary signal BD, and differentiate continuous logic level, therefore detect sync level and produce frame pulse FP.

Circuit 46 takes place and detected pulse SECP to the initialization of ROM (read-only memory) address with reference to 1 second in M-series, then according to frame pulse FP, by the ROM (read-only memory) in the address addressing machine one by one, therefore produce M-series random number data MZ, it is equivalent to the M-series random number data MS by optical disc apparatus 1 generation.

As a result, be equivalent to the processing in the optical disc apparatus 1, in CD authentication code reproducing circuit 41, produce and reproduce the needed various reference signals of CD authentication code ED.

In CD authentication code reproducing circuit 41, reference channel clock CCK, reproducing signal RF handle through mould/number conversion in mould/number conversion circuit 47, produce 8-bit digital reproducing signal.Anti-polarity circuit (1) 48 makes the polarity of digital reproduction signal anti-phase and polarity reversing signal exported.

The digital reproduction signal that selector switch 49 is selected by mould/number conversion circuit 47 directly provides, the polarity of digital reproduction signal is anti-phase, provide signal from anti-polarity circuit 48 then, be equivalent to take place the logic level of the M-series random number data MZ of circuit 46 from M-series.In detail, if the logic level of M-series random number data MZ is 1, the digital reproduction signal that selector switch 49 selects output directly to provide.On the other hand, if the logic level of M-series random number data MZ is 0, the digital reproduction signal that selector switch 40 selections have reversed polarity.Therefore selector switch 49 has reproduced the CD authentication code ED that modulates with M-series random number data MS according to many-Value Data, thereby produces the reproduction data RX of many-Value Data.

16-bit digital totalizer 52 will be reproduced data RX and from the output data AX addition of totalizer (ACU) 53, and the output total value.Totalizer 53 comprises the 16-bit memory, is used to preserve the output data of totalizer 52, and comprises the totalizer that adds up with totalizer 52, because make the data of preservation feed back to totalizer 52.At length, totalizer 53 usefulness 1 second detect pulse SECP and remove the data of preserving, and synchronously write down output data from totalizer 52 with output signal EP from edge detect circuit 44 then.Therefore, totalizer 52 adds up corresponding to the logical value of pit edge, it is to select from the logical value of reproducing data RX, and described reproduction data RX reproduces when being each second (7350 frame) of the temporal information that is provided with in subcode information by selector switch 49, thereby produces accumulated value AX.

At timing is that according to the predetermined reference value, binarization circuit 54 made the output data AX from totalizer 53 become scale-of-two, and binary data output when detection pulse SECP rose in 1 second.Therefore the reproduction data RX of the CD authentication code ED that is reproduced by selector switch 49 converts scale-of-two CD authentication code ED to.

In the ECC circuit, the use of the error correction codes by being added to CD authentication code ED makes CD authentication code ED through correction processing, so that the output error correction codes.(2-2) working condition of another embodiment

By using above-mentioned composition, in the manufacture process of CD CD 2 according to the present invention, form female CD by original key light dish device, make compact disc substrate 3 by using the pressing mold of making by female CD.In addition, on compact disc substrate 3, also be additionally formed reflection record film 4 and diaphragm 5, thereby made CD CD 2 (Fig. 7).The pit and the island of the integral multiple with the fundamental length that corresponds respectively to predetermined basic cycle T are repeated, and digital video signal etc. are recorded on the CD CD 2.

Here, CD CD 2 has a reflection record film 4, it has the membrane structure identical with the information recording film of CD-R, when the laser beam L that makes beam intensity greater than predetermined value shines on the CD CD 2, the reflectivity of reflection record film 4 irreversibly changes on the position of laser beam irradiation, and subdata additionally is recorded on the master data, and it is with the form record on pit that repeats and island.

In optical disc apparatus 1 (Fig. 6), CD authentication code ED is recorded in as above on the CD CD of making, so that CD authentication code ED does not have negative influence to the reproduction with the digital audio and video signals of the form record on the pit that repeats and island.

In detail, in optical disc apparatus 1, convert binary signal BD by binarization circuit 16 to from the reproducing signal RF that optical pick-up 13A obtains, reproduce channel clock CK by PLL circuit 17 from binary signal BD, binary signal BD is postponed by delay circuit 22, and time delay is according to when time of a position of optical pick-up 13A scanning with scan mistiming between time of same position as the optical pick-up 13B that is used for recording disk authentication code ED.

In optical disc apparatus 1, by subcode testing circuit 20A always the binary signal DBD of self-dalay circuit 22 detect subcode, according to branch (AMIN) and second (ASEC) information of being included in the subcode, by visit ROM (read-only memory) 20B, under extremely low bit rate, synchronously produce CD authentication code ED (be low to moderate per 1 second 1) with subcode.

Simultaneously, in synchronizing pattern testing circuit 21A, detect synchronizing pattern from binary signal DBD, according to the test pattern that the synchronizing pattern among the circuit 21B takes place in M-series, produce M-series random number data MS, wherein, when regularly being synchronized with synchronizing pattern, logic level 1 occurs with identical probability with 0.

Still in CD dress system 1, according to M-series random number data MS, XOR circuit 21C modulation CD authentication code ED, thereby CD authentication code ED is become be difficult to seek.

Still in CD dress system 1, when optical pick-up 13B passes through the edge of pit, edge detect circuit 23 detects regularly, with reference to the timing testing result, modulation circuit 24 is followed the output signal of gating from XOR circuit 21C, and output signal is shaped to the pulse that obtains as the gating result, and makes it have narrow width, thereby resulting switching signal MD makes the beam intensity raising of emitted laser bundle off and on from optical pick-up 13B.

As a result, according to control signal MX, on the position that the beam intensity corresponding to laser beam rises, change the reflectivity of the reflection record film 4 of CD CD 2 partly.At this moment, in the time at the edge of optical pick-up 13B scanning pit, therefore gating makes the beam intensity of laser beam rise from the output signal of XOR circuit 21C, and form sign M corresponding to the output signal of XOR circuit 21C, so topped edge across each pit.

Forming as mentioned above on the CD CD 2 of sign M, though the shake of reproducing signal RF increases, but because the reflectance varies of introducing is atomic little as mentioned above, reflectance varies does not have negative effect to the information reproduction with pit string form record, and is stable and correctly produce clock and correctly reproduce record data.

Under the situation of CD CD 2, in XOR circuit 21C, CD authentication code ED is disturbed in the application of the M-series that occurs with equal probabilities by logic level 1 wherein and 0, thereby write down CD authentication code ED through disturbing, when on oscillograph, observing the signal waveform of reproducing signal RF, the information of CD authentication code ED occurs as noise, is difficult to find CD authentication code ED.In addition, be difficult to reproduce CD authentication code ED.

Except above-mentioned, because 1 CD authentication code ED is defined as 1 second time cycle, that is because in total 7350 (7350=75 * 98) EFM frame 1 be that dispersed ground writes down, even reproducing signal is subjected to noise, recording disk authentication code ED consistently.

Though the digital audio and video signals D1 (also recording disk is differentiated as mentioned above) with the form of pit string record on CD CD 2 is to reproduce by traditional bootlegging method, can not reproduce CD authentication code ED.

Make the CD of bootlegging fully the same with the CD CD, just need be with identical sign form recording disk authentication code ED, to do like this, just must use a kind of optical disc recording medium, it has the reflection record film, and before writes down the digital audio and video signals D1 of pit string form thereon.Must use one the unit of analog structure to be arranged in addition with optical disc apparatus 1.As a result, CD authentication code ED becomes and is difficult to reproduce.

When laser beam irradiation is arrived the CD CD of as above making 2 (Figure 10), in CD CD player 30, detect reproducing signal RF, its signal level changes with the beam intensity institute of the folded light beam that shines the laser beam on the CD CD 2 the corresponding time, therefore the signal level of reproducing signal changed with pit and corresponding time of island structure institute, also change corresponding to the reflectivity of CD CD 2, thus by binarization circuit 35 with reproducing signal RF binarization.Then, 37 couples of binary signal BD of EFM demodulator circuit carry out scale-of-two-discriminating, manage through separating the mediation staggered place then, and carry out correction processing by ECC circuit 38.Correspondingly, reproduce digital audio and video signals.

At this moment, because the existence of sign, signal level near each pit edge has small change, because sign is to form by the reflection that changes partly on the CD CD 2, differentiate correctly that on the enough correct level of reality binary signal to produce clock, correctly reproduces according to the clock that is produced.As a result, use the common CD CD player CD CD 2 of correctly replaying, though on CD CD 2 recording disk authentication code ED.

When reproducing digital audio and video signals as mentioned above the time, CD authentication code reproducing circuit 41 reproduces the CD authentication code ED from CD CD 2 simultaneously.If fail correctly to reproduce CD authentication code ED, think that then this CD is illegal copy, control D/A switch circuit 39 at once and stop the D/A switch processing.

In detail, when reproduction is recorded in CD authentication code ED (Figure 11) on the CD CD 2, synchronizing pattern testing circuit 45 detects frame synchronization, circuit 46 takes place and produces M-series random number data MZ in M-series, and it is corresponding to being used for the M-series random number data MS that reference frame synchronization after testing writes down together.

In addition, edge detect circuit 44 detects regularly when laser beam is passed pit edge, and when subcode took place with second, subcode testing circuit 42 detected regularly.

Mould/number conversion circuit 47 converts reproducing signal RF to digital reproduction signal, selector switch 49 is selected digital reproduction signal or is made the anti-phase digital signal of polarity with reference to M-series random number data MZ, thereby the reproduction data RX of reproduction multi-value data form, it represents the logic level of CD authentication code ED.

When reproducing CD CD 2, totalizer 53 and totalizer 52 selectively add up and reproduce data RX, it corresponding to when subcode carries out step by step by each pit of second.Thereby the SN ratio that is got by CD authentication code ED reproduction result improves.Binarization circuit 54 makes accumulation result become scale-of-two, therefore makes CD authentication code ED decoding, and CD authentication code ED passes through the correction processing of being undertaken by ECC circuit 55 and offers system, control circuit 40 then.

When reproducing CD authentication code ED, though the variation of edge reflections rate is less, the CD authentication code ED that obtains is as the resultant signal that obtains from many pit edge.Can carry out fully on CD, not having the negative effect of random noise to CD authentication code ED with decoding consistently.Avoided the negative effect that level fluctuation caused of whole reproducing signal effectively.When CD authentication code ED decodes according to total signal, (be subjected to the interference of M-series because of CD authentication code ED during writing down) and can very stably reproduce CD authentication code ED.

(2-3) effect of another embodiment

According to aforesaid composition, make laser beam irradiation to the CD CD, the reflectivity that therefore changes the CD CD partly is to form shake, by using shake recording disk authentication code.So the recording disk authentication code causes the optical pick-up that reproduces digital audio and video signals to reproduce it, rather than bootlegging, for the reproduction of the digital audio and video signals of pit string form record without any negative effect.

Because with reference to subcode, 1 of CD authentication code is defined as 1 second, and 1 pit edge that have 10 for record at least of regulation CD authentication code, when reproducing, reproduce the CD authentication code consistently, without any The noise.

Because for record, be not easy between noise and CD authentication code itself, to differentiate so the CD authentication code is recorded into M-series random data modulation CD authentication code.Therefore be difficult to seek and the optical analysis discs authentication code.In addition, reproduce consistently the CD authentication code when reproducing without any The noise.

Because detect the signal level of reproducing signal, so that the CD authentication code is decoded, in the CD CD player, to the noise that signal level adds up and is blended in the CD authentication code to remove, can replay consistently is recorded as the difficult CD authentication code of differentiating from noise.

Because selector switch 49 is selectively handled digital reproduction signal to produce the CD authentication code by using M-series random data MZ, can replay consistently is recorded as the CD authentication code that can not seek and analyze.

(3) another embodiment

Though describe the situation that the CD-R membrane structure is applied to the reflection record film in the above-described embodiments, the present invention is not limited only to this situation; For example, membrane structure that can application phase change type CD can additionally be recorded in this data type on the traditional C D CD, and if possible irradiation has the laser beam of sufficiently high intensity off and on.

Form sign so that horizontal lid pit edge though described in the above-described embodiments, the present invention is not limited only to this situation; For example, can obtain and the resulting identical effect of the foregoing description form this class sign near edge.

Reset by second though described M-series in the above-described embodiments, the present invention is not limited only to this situation; For example, can M-series be resetted and obtain and the resulting identical effect of the foregoing description with each CD frame.

Though write down the CD authentication code in the above-described embodiments, the present invention is not limited only to this situation; For example, can write down the needed various data of deciphering,, encrypt needed key information, if or write down key information and selected or the needed data of decoding if write down if write down the digital audio and video signals of encrypting according to the length on pit and island.

Though in the above-described embodiments the CD authentication code is recorded on the CD CD, the present invention is not limited only to this situation; For example, counting that can record-playback in using the CD CD player.

Though differentiate that through scale-of-two the present invention is not limited only to this situation to reproduce the CD authentication code by the accumulated value of totalizer in the above-described embodiments; For example, accumulated value is differentiated through the many-value that is used to reproduce.

Though write down the EFM modulation digital audio signal in the above-described embodiments, the present invention is not limited only to this situation; For example, bright various modulation such as 1-7 modulation, 8-16 modulation and the 2-7 of being applied to of this law can be modulated.

Though write down the data of the form on pit and island in the above-described embodiments, the present invention is not limited only to this situation; For example, the present invention can be widely applied to the required data of record mark and gap form.

Though the present invention is applied to CD CD and peripherals thereof with recorde audio signal in the above-described embodiments, the present invention is not limited only to this situation; For example, the present invention can be widely applied to various CDs such as video disc and peripherals thereof.

(4-1) structure of another embodiment

Figure 12 is the block scheme of another embodiment optical disc apparatus of the present invention.

By laser beam is exposed on original disc 2, optical disc apparatus 1 recording audio data D1.Obtain voice data D1 from the digital audio frequency recording device.

In detail, in optical disc apparatus 1, rotating shaft motor 4 makes original disc 2 rotations, remains on the FG signal generating circuit output FG signal of rotating shaft motor 4 bottoms, and on each predetermined angle of rotation, this signal level rises.According to laser beam on original disc exposure position and therefore with reference to the FG signal, the rotational speed of rotating shaft servo circuit 5 control rotating shaft motors 4 is with predetermined rotational speed rotating disc 2.

The laser diode 7 that is used to write down comprises gas laser element etc., and it shines laser beam L1 on the CD 2 that will expose.Photomodulator 8A comprises, for example, and the electroacoustic optical element.According to EFM (8-14 modulation) the signal S2 from modulator 9 outputs, photomodulator 8A makes laser beam modulate and export modulated laser beam L2 through on-off.

Light deflector 8B comprises, for example, and the electroacoustic optical element.According to the key modulation signal KS from 10 outputs of key modulator, light deflector 8B makes from the laser beam L2 deflection of light deflector 8A output, thereby changes the direction of illumination of laser beam L2 to the inside/outside district of CD 2.

Catoptron 12 bends from the path of the laser beam L3 of light deflector 10 outputs, thereby to CD 2 outgoing laser beam L3.Object lens 13 will be from catoptron 12 laser light reflected beam convergences on the record surface of CD 2.Catoptron 12 and object lens 13 boths synchronously shift to outskirt from the inner region of CD 2 step by step by the threading device (not shown) and the rotation of CD.

As a result, the focus point that optical disc apparatus 1 can make laser beam L3 step by step is displaced to outskirt from the inner region of CD 2, therefore, forms helical trajectory on CD 2.In addition, in the processing that forms this track, therefore optical disc apparatus 1, forms pit string along track in turn according to the on/off state of EFM signal S2 control laser beam L1 by light deflector 8A.In addition, optical disc apparatus 1 skew laser beam L2 is by the point of irradiation of light deflector 8B.Therefore make each pit be displaced to the inside/outside district of CD according to key modulation signal KS.

Therefore, in optical disc apparatus 1, form each pit in order to reduce deviation to the inside/outside district of CD 2, therefore follow the tracks of by control, make its tracking that identical characteristic be arranged with traditional C D CD player, from the optical disc replay data of making based on this original disc, that is, the reproduction of record data is not subjected to the interference of any pit string.More specifically, in this embodiment, also be not more than 1/50 of track pitch when the maximum deviation even each pit is compressed to the deviation in CD inside/outside district.

Digital audio taperecorder 3 outputs to encrypted circuit 15 with voice data D1.Encrypted circuit 15 is encrypted this voice data according to DES (data encryption standards) code and with reference to key information KY, then the result is exported.

Subcode generator 16 produces sub-code data SC in turn and the data SC that is produced is exported with the predetermined form that is used for the CD CD.Modulation circuit 9 is handled from the output data S1 of encrypted circuit 15 outputs, and subcode SC, therefore produces EFM signal S2 in predetermined CD disk format.In detail, modulation circuit 9 is added to correction codes on the output data S1 and sub-code data SC of encrypted circuit 15 outputs, and the alternation sum modulating data is to produce EFM signal S2 then.

As a result, in optical disc apparatus 1, can encrypt and record voice data D1 with the form of pit string on the original disc 2.

Key modulation circuit 10 key information KY produce key modulation signal KS and the result are exported.As a result, in optical disc apparatus 1, according to exporting to each recording key information KY of the inside/outside district of CD skew and with the result.In this optical disc apparatus 1, by generation key informations such as ROM (read-only memory).

Figure 13 is the more detailed block diagram of key modulation circuit 10.In key modulation circuit 10, as shown in figure 14, with EFM signal S2 (Figure 14 A) input PLL circuit (phaselocked loop) 20 and there from EFM signal S2 reproduction clock CK (Figure 14 B).

Sync detection circuit 21 reference clock signal CK in turn latchs EFM signal S2, and the continuous logic level of definite signal S2, therefore detects synchronizing pattern from EFM signal S2.Sync detection circuit 21 output frame clock FCK, its logic level rises when each synchronizing pattern.As a result, in the form of CD CD, make synchronizing pattern be positioned at the initial of each frame, comprise 588 channel clocks.As a result, sync detection circuit 21 output frame clock FCK, its logic level is that unit rises with 588 clocks.

Subcode testing circuit 22 reference clock CK monitor EFM signal S2 and according to EFM signal S2 antithetical phrase code decoding.In addition, subcode testing circuit 22 monitors that the temporal information and the output 1-that are included in the subcode of decoding detect pulse SECP second, and its signal level rises when temporal information changes 1 second.As a result, in the form of CD CD, stipulating had 98 frames in 1 second, thus subcode testing circuit 22 output to detect pulse SECP so that its signal level in 1 second be that unit rises with 98 pulses of frame clock (FCK).

Counter 23 is the multi-stage counters that are used for frame clock FCK.If 1-detects pulse SECP rising second, Counter Value CT is resetted.Counter 23 consists of ring counter, and it circulated count value CT in several seconds.Count value CT and frame clock FCK synchronously change.

Data selector 24 is according to the data of the count value CT of counter 23 output by its preservation, used as being the address.The count value CT of counter 23 and synchronizing pattern are that unit changes with per second 98 frames periodically synchronously.Therefore data selector 24 outputs 98 class data are synchronously exported singly with the synchronizing pattern as the address that obtains from count value CT.The count value of counter 23 detects pulse SECP second according to 1-and changes on several seconds intercycle ground, thus data selector 24 the several seconds intercycle repeat to export this 98 class data.

In this embodiment, the output by in the several seconds, repeating the 1-bit data (described one digit number according to be to each regulation in the 98 class data), data selector 24 is synchronously exported the 98-bit data with synchronizing pattern.In addition, each among the key information KY of regulation 54-position is for each pre-determined bit of 98-bit data and stipulate that remaining 44 each is meaningless position.In the present embodiment, be that the data KZ that fixes is defined as this nonsignificant data with value.

Circuit 25 takes place and comprises a plurality of flip-flop circuits and the XOR circuit that is connected in series respectively in M-series.According to frame clock FCK, M-series takes place in circuit 25 each in these flip-flop circuits initial value to be set.In addition, M-series generation circuit 25 so will be provided with data and synchronously transmit with clock CK singly, and produce M-series random number data MS, because data value is fed back between predetermined level, so in this data M S, logic level 1 is identical with 0 probability that occurs.As a result, circuit 25 output random number data MS take place in M-series, and it is and the pseudo random number of the synchronous scale-of-two series of clock CK, therefore repeat identical figure in a frame period, and it is 588 clock period.

XOR circuit (X) 27 receives random number data MS and from the output data KD of data selector 24, the signal MS1 of the XOR of output data MS and KD (Figure 14 C) then.In detail, if from the logical value of the data KD of data selector 24 output is 0, XOR circuit 27 output random number data MS then, if be 1 from the logic level of the data KD of data selector 24 outputs, then XOR circuit 27 outputs have the random number data MS of reverse logic level.As a result, XOR circuit 27 can be formed the key information KY of output data KD and export modulated key information with the random number modulation.

Flip-flop circuit 28 latchs from the output signal MS1 of XOR circuit 27 and output through latched data MS1 (Figure 14 D) with reference to the rising edge of EFM signal S2.In this embodiment and since make CD 2 according to EFM signal S2 to laser beam lithography, based on original disc 2 manufacturing CD on, the scanning start edge of each pit is corresponding to the rising edge of EFM signal S2.The result, in a time interval, trigger circuit 28 are preserved the logic level of the latched data MS1 of institute, and the described time interval is when in turn from XOR circuit 27 output data MS1 (as clock period in the reference cycle that is used to form each pit the time) and (start the timing of each pit and finish the formation of a pit at least) time interval between twice when latching output data MS1 to its regulation.

Amplifier circuit 29 is driving amplifiers, is used to drive light deflector 8B and amplifies from the output signal of trigger 28 and will output to light deflector 8B as key modulation signal KS through amplifying signal.As a result, amplifying circuit 29 energy step-by-steps are to the point of irradiation of the inside/outside district of original disc 2 skew laser beam.In amplifying circuit 29, gain is set so that the restriction site skew makes it maximum and is no more than 1/50 of track pitch.Therefore can prevent that optical disc apparatus 1 fails when reproducing the record data of pit string form.

In the present embodiment, therefore, development and processing are used for electronics with the original disc 2 that is exposed to laser beam as the method and are shaped, and have therefore made female CD.Make pressing mold with female CD then.In addition, use the method identical to make CD with pressing mold with original CD CD manufacture process.

As a result, in the present embodiment, can make CD, thus the voice data D1 that encrypts with the pit string form of record and with each pit P to the skew recording key information KY in the inside/outside district of CD (Figure 14 E-2).In other words, in common CD CD, S2 forms pit P at the track center singly along track according to the EFM signal, and according to the length of each pit and the time interval recording audio data between the pit (Figure 14 E-1).Otherwise, under the situation of the CD of present embodiment, the voice data that writes down is encrypted according to the length of each pit and the time interval between pit, is used for the key information KY that the encryption to voice data is decrypted according to each pit to the skew record in the inside/outside district of CD.

Figure 15 is the block scheme of optical disc apparatus 30, is used to reproduce the data from the CD of as above making 31.In this optical disc apparatus 30, under the control of servo circuit 33, rotating shaft motor 32 is with constant linear velocity rotating disc device 31.

Optical pick-up 34 receives reflection lasering beam with laser beam irradiation to CD 31 and on predetermined receiving element, export reproducing signal RF then, and its signal level changes according to the beam intensity of the reflection lasering beam on receiving element.The signal level of reproducing signal RF changes according to each pit that is recorded on the CD 31.

In addition, reflection lasering beam is handled in optical detection 34, receives this light beam with so-called push-pull method on the light beam receiving element, therefore produces push-pull signal PP, and on the interior outskirt of CD 31, this signal changes with respect to laser beam irradiation point according to each groove position.Optical detection apparatus 34 output focus error signals, its signal level changes according to the amount of focusing error.

In servo circuit 33, this push-pull signal PP is used for restricted band, thereby produces tracking error signal, and the leave the right or normal track skew at mark center changes its signal level according to laser beam.And, with the tracking of this tracking error signal control optical pick-up 34.The focusing of servo circuit 33 usefulness focus error signals control optical detection 34.

Therefore the low frequency component of Hi-pass filter (HPF) 35 excision push-pull signals removes the leave the right or normal track skew at mark center of laser beam irradiation point from push-pull signal PP, the leave the right or normal track skew at mark center changes the signal level of described push-pull signal according to laser beam.As a result, Hi-pass filter (HPF) detects offset detection signal HPP, and the leave the right or normal track skew at mark center changes its signal level according to each pit.

Binary circuit 36 makes reproducing signal RF binarization on the predetermined reference level, therefore produces binary signal BD.

PLL circuit 37 is worked with reference to this binary signal BD, has therefore reproduced the channel clock CCK of reproducing signal RF.

EFM demodulator circuit 38 reference channel clock CCK adjoining lands latch binary signal BD, therefore reproduce the data corresponding to EFM restituted signal S2.In addition, EFM demodulator circuit 38, after these reproduction data of demodulation become EFM, reference frame will be divided into the unit of 8-position through demodulating data synchronously, output to ECC (error correction codes) circuit 39 to 8-position signal deinterleave that each produced and with the result.

According to the error correction codes in the output data that is added to EFM demodulator circuit 37, the error that ECC circuit 39 is proofreaied and correct in output data is reproduced encrypted voice data then and data are reproduced in output.。

Password processing circuit 40 is according to by key testing circuit 42 detected key information KY voice data being deciphered and exported through decrypted data.

D/A switch circuit (D/A) 41 will convert simulated data and output analog audio data S4 from the digital audio-frequency data D1 of password processing circuit 40 to.

Key testing circuit 42 reference channel clock CCK and binary signal BD handle offset detection signal HPP, therefore reproduce key information KY and will reproduce data to output to password processing circuit 40.

Figure 16 is the more detailed block diagram of key testing circuit 42.In key testing circuit 42, subcode testing circuit 52 reference channel clock CCK monitor binary signal BD and demodulation subcode from binary signal BD.In addition, subcode testing circuit 52 monitors that the temporal information and the output 1-that are included in the demodulation sub-code information detect pulse SECP second, and when temporal information changed one second, its signal level rose.

Pit detection circuit 54 latchs binary signal BD in turn by the timing of channel clock CCK and continuous two is compared mutually through latching the BD signal, therefore detects the pit rise time according to comparative result.Pit detection circuit 54 is according to comparative result output edge detection signal PT when pit rises regularly.Pit detection circuit 54 also detects the center output center detection signal CTP that pit descends regularly and centers on each pit according to the testing result of respective dimple rise time with identical method.

Sync detection circuit 55 reference channel clock CCK in turn latchs binary signal BD, and the continuous logic level of definite binary signal BD, therefore detects synchronizing pattern.The result, as shown in figure 17, sync detection circuit 55 produces one and pulse FSET (Figure 17 A3,17B and 17D) and a quenching pulse FCLR (Figure 17 C) is set and exports these pulses, when synchronizing pattern begins regularly, the signal level that pulse is set only rises a clock period, and the signal level of quenching pulse ratio is provided with pulse FSET and postpones a clock period and just rise.

The result, because in scale-of-two reproducing signal BD, with 588 clock period is that unit and per second detect synchronizing pattern (Figure 17 A1 and 17A2) for 98 times, uses this synchronizing pattern, and sync detection circuit 55 can synchronously be exported quenching pulse FCLR and pulse FSET is set.

M-series take place circuit 56 with reference to quenching pulse FCLR to each address initialization, visit inner ROM (read-only memory) according to channel clock CCK by the address then, thereby, produce M-series random number data MX corresponding to the M-series random number data MS that in optical disc apparatus 1, produces.

As a result, corresponding to the processing of carrying out in optical disc apparatus 1, key testing circuit 42 can reproduce the necessary reference signal of various reproduction key information KY.

In key testing circuit 42, mould/number (A/D) change-over circuit 57 reference channel clock CCK convert simulation migration detection signal HPP to digital HPP signal, export 8-bit digital reproducing signal then.Anti-polarity circuit (1) 58 makes the anti-phase and output polarity reversing signal of the polarity of digital reproduction signal.

Timing at edge detection signal PT, latch cicuit 59 latchs M-series random number data MX, and in a time, keep the latched data MX of institute, the described time be when XOR circuit in key modulation circuit 10 during deal with data MX as described in reference Figure 13, that is the time interval between two time when beginning to form pit and when finishing the formation of pit.

Selector switch 60 is according to selecting digital signal that directly enters from A/D change-over circuit 57 or the reversed polarity digital signal that enters from anti-polarity circuit 58 from the logic level of the output data MZ of latch cicuit 59 outputs, and the signal of output through selecting.In other words, the digital signal that selector switch is selected and output directly enters when the logic level of data M Z is 1 is selected when the logic level of data M Z is 0 and output reversed polarity digital signal.As a result, selector switch 60 reproduces the logic level of key information KY (KD) and the data RX that output is reproduced with many-Value Data, and described key information is transferred with M-series random number data MS by using many-Value Data.

Totalizer 62 is 16-bit digital totalizers and makes the output data AX addition of reproducing data RX and exporting from totalizer (ACU) 63, and the output total value.Totalizer 63 comprises the 16-bit memory, is used to preserve the output data from totalizer 62.Totalizer 63 feeds back to totalizer 62 with the output data of its preservation, thereby forms the totalizer that adds up with totalizer 62.In other words, totalizer 63 usefulness quenching pulse FCLR are to its zero clearing, synchronously add up from the output data of totalizer 62 with output signal CTP from pit detection circuit 54 then.

As a result, combination totalizer 62 and totalizer 63, make they according to M-series random number data MS to adding deduct in the detected off-set value of each pit centres.Repeat this adding/subtract processing for each frame period.

According to the predetermined reference value, binary circuit 64 makes the output data AX from totalizer 63 become scale-of-two, and the data of output binarization.As a result, binary circuit 64 can use the many-Value Data that is reproduced by selector switch 60 to convert binary data to from the data RX that key information KY reproduces.

Shift register (SR) 65 is 98-bit shift register.Shift register (SR) 65 received from the binary data of binary circuit 64 outputs in turn in the rise time that pulse FSET is set, and transmitted these data then.

Flip-flop circuit (F/F) 55 is obtained from the data of shift register 65 outputs with position-parallel state in 1-detects time interval of pulse SECP second and is preserved this data.As a result, the flip-flop circuit in key testing circuit 42 66 can be preserved the data KD that comprises key information KY and fixed value data KZ.Key testing circuit 42 is optionally exported the pre-determined bit that is kept in the flip-flop circuit 66, therefore key information KY is offered password processing circuit 40 and the voice data deciphering to encrypting.

(4-2) working condition of another embodiment

In above-mentioned structure, in the present embodiment, in the manufacture process of CD 31, optical disc apparatus 1 makes laser beam lithography on original disc 2, develops and handles this original disc and be used for the electronics shaping, has therefore made female CD.Make pressing mold and CD with this mother's CD then.

When making laser beam lithography on original disc 2, in optical disc apparatus 1, the voice data D1 that records machine 3 outputs from digital audiotape enters coding circuit 15 and uses predetermined key information KY coding there.As a result, voice data D1 is handled cause not that this key information KY can not reproduce.After this, in modulation circuit 9, use and the identical method of traditional C D CD, convert voice data D1 to EFM signal S2.

In optical disc apparatus 1, the on/off state of EFM signal S2 control laser beam L1, and make in check laser beam L2 converge to outskirt from the inner region of original disc 2 in turn, thereby on object optical disc, from the inner region to the outskirt, form helical trajectory.Therefore with encoded voice data D1 with the form of pit string along track record.

With voice data D1 during with the form of pit string record, the key modulation circuit 10 in optical disc apparatus 1 can be modulated key information KY and make it to be not easy deciphering, thereby produces key modulation signal KS when so.And this key modulation signal KS drives light deflector 8B and the focus of laser beam is shifted to the inside/outside district of original disc 2.According to of the skew of each pit, therefore write down key information KY to the inside/outside district of CD 2.

Therefore, in the present embodiment, may provide encoded voice data D1 to cause does not have key information KY not reproduce, same, and key information KY is recorded on the medium together.

The position deviation of each pit that restriction as above forms is no more than 1/50 of track pitch, therefore promptly uses microscope also to be not easy to discern the skew of pit.This causes the offset of analyzing each pit very difficult, illegally puts again so can protect CD make it effectively.

In addition because that difference is moved in the position is minimum, can be correctly aspect phase place and amplitude with enough nargin reproduction reproducing signals.Therefore can correctly reproduce voice data D1 with pit string form record.Sometimes this pit can influence the control of tracking to the skew in the inside/outside district of CD, but the precision of tracking is never disturbed in the like this little skew of pit in the present embodiment.Therefore, can reproduce the voice data that writes down with the pit string form with enough degree of accuracy in actual applications.

In detail, because regulation had 98 frames in one second on the CD CD, when to each frame regulation one digit number according to the time, key information KY (Figure 13) is set in data selector 24, the data KZ that therefore will comprise 44 meaningless fixed bits is added among the key information KY that comprises 54-position DES code.

Key information is set, therefore from data selector 24 outputs one to frame regulation so that according to detected synchronizing pattern in sync detection circuit 21 and in subcode testing circuit 22 detected SECP, it was circulated by second.

Simultaneously, M-series generation circuit 25 produces random number data MS, and it is a scale-of-two series, and wherein logic level 1 occurs with identical probability with clock synchronization ground with 0, and repeats in frame according to the FCK of indication detection synchronizing pattern.

When XOR circuit 27 obtains XOR between key information KY (KD) and random number data MS, export key information KY (KD) from data selector 24, and modulate with random number data MS.At this moment, because this random number data MS is a scale-of-two series, wherein logic level 1 occurs with identical probability with 0, from the modulated output data of XOR circuit 27 logic level 1 and 0 is occurred with much at one probability.

In key modulation circuit 10, when EFM signal S2 rises, latch therefore in each pit on being formed on original disc selectively one of the regulation output data by trigger 28 with the output data MS1 that produces as the method.And according to this logic level, therefore the focus point that makes laser beam L3 by light deflector 8B is offset recording key information KY according to the inside/outside district to CD 2 to the skew of the inside/outside district of CD 2.

In the present embodiment, the key information KY (KD) that is unit with the single position of every frame from data selector output also modulates this key information KY (KD) with random number data MS, therefore make the skew of pit P opsition dependent.Thereby on CD, pit P is brokenly to the skew of the inside/outside district of CD 2.

Thereby, in the present embodiment, with the position of a plurality of the recording key information KY (KD) of distribution, therefore to this key information KY (KD) that writes down from the pit of track center random offset extremely difficulty look for.More correctly, promptly use microexamination optical disc data record surface, can only see seeming, therefore look for very difficulty of this key information KY with eye through noise-modulated bit string.As a result, in this case, because of regulation key information KY is 588 channel clocks, when distribution, one of key information KY is come record to be no less than 50 pits at least.

In addition, this moment, logic level 1 occurred with identical probability with 0 in random number data MS, and in order to make the interior and outskirt skew of pit to the regulation center, it is also with much at one probability formation.And, because the offset of each pit is minimum, when the various signals that obtain from optical pick-up being observed, think that the skew of pit only is the mixing of noise with microscope.Whether therefore be difficult to check from the waveform of these signals has key information KY to exist.

On the other hand, the skew of each pit does not comprise the offset component of any direct current.In addition, because output data MS1 is latched in the trigger circuit 28, and each pit is offset its position according to data M S1, can easily detect the skew of pit, promptly uses the SN that extremely reduces to detect.Obtain the high band component and obtain SN from the push-pull signal PP that is used for detecting tracking error.As a result, when when simple structure is reproduced key information KY with the traditional optical acoustic pickup, can prevent bootlegging to CD.

More specifically, just as in traditional CD CD player, the CD of as above making 30 allows reproducing signal RF binarization in binarization circuit 36, handles in EFM demodulator circuit 38 then.In addition, in ensuing ECC electricity 39, the error in signal RF is proofreaied and correct, thereby reproduced encrypted voice data.In the password processing circuit of following 40, according to the key information KY that obtains respectively voice data is deciphered, therefore will can be rendered as sound by D/A change-over circuit 41 with the sound signal of pit string form record.

In optical disc apparatus 30, the frequency band of the push-pull signal PP that obtains by Hi-pass filter 35 restricted passage optical pick-ups 34, depart from-track-center detection signal HPP thereby may detect, the skew to the inside/outside district of the CD 2 with simple structure changes its signal level according to each pit.

In addition, in optical disc apparatus 30, handle offset detection signal HPP, therefore can reproduce key information KY by key testing circuit 42.

In detail, in key testing circuit 42, by channel clock offset detection signal HPP is converted to digital signal, make polarity anti-phase by polarity switching 58 then by A/D change-over circuit 57.

With this two classes digital signal according to output data MZ input summer 62 selectively.Corresponding to the pit of reference binary signal BD, produce data M Z as result by latch cicuit 59 latched random number data M S.Select with the digital signal of input summer 62 with reference to FCLR there through adding up with this mode, described FCLR is a synchronizing pattern after testing.

In detail, when record, to add deduct in the rise time of EFM signal S2 according to output signal from the output data of A/D change-over circuit 57, add up in totalizer 63 for each frame as the result's who adds and subtract the value AX through adding up (it is the result that scale-of-two is differentiated) from XOR circuit 27 (Figure 13).In addition, when the beginning synchronizing pattern, the value AX through adding up in totalizer 63 is delivered to shift register 65, thereby key information KY has been carried out demodulation.

The result, because the skew of each pit is so little and will so a frame be added up from the offset detection signal HPP that each pit obtains, even so that S/N after differentiating than scale-of-two with high S/N, can reproduce key information KY than the discriminating of extremely low also process scale-of-two.Therefore can reproduce key information certainly, when it being recorded as when being not easy to look for.

In key testing circuit 42, when circuit 42 added up the signal level of offset detection signal HPP, corresponding to the center of each pit, totalizer 63 was obtained the data from totalizer 62.As a result, the signal level to offset detection signal HPP in stable timing adds up, thereby key testing circuit 42 more improves aspect accuracy of detection.

Also can carry out by the on/off state of use from the bootlegging of above-mentioned original disc 2 from the binary signal BD control laser beam of binary circuit 36.Yet in this bootlegging, record leaves the right or normal track with the position of each pit, and relevant key information KY is very difficult for the skew at mark center.In the present embodiment, make bootlegging original disc 31 become very difficulty.

Go up under the situation of reproducing audio data at the CD (only so reproducing pit string) from bootlegging, will not reproduce the key information that writes down from the skew at track center according to pit, therefore output is only as the sound signal of encrypting noise.Therefore, can not normally reproduce the music of record, useless thereby the CD of bootlegging becomes, thereby stoped bootlegging.

Therefore, in the present embodiment, can recording key information so that reproduce with optical pick-up for reproducing audio data, reproducing aspect the voice data of pit string form record, can not illegally write down and not have any negative effect.

(4-3) effect of another effective embodiment

Structure according to aforesaid optical disc apparatus, owing to be form recording key information with the pit string of the inside/outside district of mind-set CD from track skew, can recording key information so that reproduce with optical pick-up for reproducing audio data, reproducing aspect the voice data of pit string form record, can not illegally write down and do not have any negative effect.As a result, can be with the voice data encrypted with this key information with the form record of pit string so that prevent bootlegging effectively.

In addition, because with binary level it was modulated before the record key, this key information that writes down with the pit string form from the track off-centring is difficult to look for, and this has stoped bootlegging effectively.

In addition, owing to having been used, binary level causes logic level 1 and 0 M-series random number with the equal probabilities appearance, output signal from optical pick-up looks like the noise mixing, thereby is not easy to look for the key information that is write down and prevents bootlegging effectively.

Present embodiment also makes a regulation to key information have at least 50 pits to become possibility, and these pits are set make their off-track centers slightly, thus the key information of reproducing recorded reliably.

In detail, with reference to binary level with signal level integration to the offset detection signal.The key information that therefore can reproduce the off-track center slightly of making it and write down.

In addition and since with each pit from the offset-limited at track center to being no more than 1/50 of track pitch, be difficult to look for key information with the pit form record that departs from so slightly.

(5) another embodiment

In the above-described embodiments, though to of frame regulation key, the present invention is not limited only to this situation; For example, can stipulate a plurality of secret key bits and in addition to a frame, can be to of a plurality of frames regulation key informations.And, replace the regulation of reference audio Frame to this key information, can be with reference to of pit number regulation key information.

In the above-described embodiments, by to of frame regulation key information, though be with distribution be no less than of 50 pit recording key information, the present invention is not limited only to this situation; For example, can change pit number on demand to a regulation.As found that of test, if of regulation key information is no less than 20 pits, can the S/N that is enough to satisfy practical application than the time recording key information.

In the above-described embodiments, though used additional meaningless fixed bit to come recording key information, the present invention is not limited only to this situation; For example, can be in the key information that will write down additive error correction codes and/or copyright data etc.

In the above-described embodiments, though be with the required data of the form of pit string record and to be used for the required key information of data decryption also be that the present invention is not limited only to this situation with the form record of pit from the skew of the track mind-set/interior outskirt of CD; For example, the data of other kind, such as the authentication data that is used for reproduction is enabled and forbids, can replacement key information.

In the above-described embodiments, though make the process of the value through adding up scale-of-two discriminating in totalizer, thus key information reproduced, and the present invention is not limited only to this situation; For example, accumulated value is differentiated through too much-value.In this case, can be with the many-Value Data of pit record from the track off-centring.

In the above-described embodiments, though before the recording digital audio signal they are modulated to the EFM signal, the present invention is not limited only to this situation; For example, can modulate digital audio and video signals, such as 1-7,8-1,2-7 modulation with various modulation.

In the above-described embodiments, though at the whole surface recording key information of CD, the present invention is not limited only to this situation; For example, record in limited district only is such as the boot section.

In the above-described embodiments, though write down needed data with the form of pit string, the present invention is not limited only to this situation; For example, can write down needed data with the form of mark string.

Though the present invention is applied to be used for the CD of recording audio data and its peripheral unit, thus recorde audio signal, and the present invention is not limited only to this situation; For example, the present invention can be applied to various types of CDs, such as video disc and its peripheral unit.

As mentioned above, according to the optical disc apparatus of present embodiment, during in using said method any, the value of every kind of pirated CDs can reduce widely, thereby can prevent the popular of this pirated CDs.

In addition, according to the present invention, owing to change the reflectivity of CD partly, give each marginal position information one shake, and come the required data of addition record with shake,, the reproduction with the serial data of pit string form record is not had adverse influence so can write down such as data such as CD authentication codes, so that reproduce data, but not by bootlegging with the optical pick-up that reproduces serial data.

In addition, according to the present invention, since with pit from the track center of CD inwardly/the form record of outskirt skew is as the subdata of key information and so on, so can write down various data, so that the optical pick-up with the serial data that is used to reproduce pit string form record produces various data, but can not carry out bootlegging according to the method for reproducing.

Claims (23)

1. an optical disc apparatus is characterized in that, comprising:

Homophony system signal generation apparatus is used for according to master data, produces homophony system signal;

Laser beam irradiation device is used for according to described homophony system signal laser beam irradiation at CD, thereby forms pit string and mark string on described CD;

Modulation signal occurrence device is used for producing son-modulation signal according to subdata; And

Depart from device, be used for the point of irradiation of described laser beam being shifted to the inside/outside district according to described sub-modulation signal.

2. optical disc apparatus as claimed in claim 1 is characterized in that, described son-modulation generating means comprises:

Pick-up unit regularly is used to detect the timing at the edge of described pit or mark, and exports detected timing;

Binary number series generating means is used to produce predetermined binary number series; With

Modulating device is used for producing described sub-modulation signal according to described binary number series and described detected timing from described subdata.

3. optical disc apparatus as claimed in claim 2 is characterized in that, described binary number series is M-series random number.

4. optical disc apparatus as claimed in claim 1 is characterized in that, by with described subdata described master data being encrypted, described homophony system signal generation apparatus produces described homophony system signal.

5. optical disc apparatus as claimed in claim 1 is characterized in that, described homophony system signal generation apparatus produces described homophony system signal, so that in the cycle that integral multiple determined of predetermined basic cycle, changes described intensity of laser beam.

6. optical disc apparatus as claimed in claim 1 is characterized in that described son-modulation signal occurrence device produces sub-modulation signal, so that has and be no less than corresponding to described subdata of 20 pits or mark.

7. the method at the CD identifying recording layer is characterized in that, said method comprising the steps of:

Produce the step of homophony system signal according to master data;

According to described homophony system signal, by described CD illuminating laser beam is formed the step of pit string or mark string on described CD;

Produce the step of son-modulation signal according to subdata; And

According to described son-modulation signal, the step that makes the point of irradiation of described laser beam be partial to the inside/outside district of described CD.

8. the method at the CD identifying recording layer as claimed in claim 7 is characterized in that, according to corresponding to the edge of described pit and mark and the timing of predetermined binary number series, produces described son-modulation signal from described subdata.

9. the method at the CD identifying recording layer as claimed in claim 8 is characterized in that, described binary number series is M-series random number.

10. the method at the CD identifying recording layer as claimed in claim 7 is characterized in that, according to described subdata, by described master data is encrypted, produces described homophony system signal.

11. the method that is used at the CD identifying recording layer as claimed in claim 7 is characterized in that, produces described homophony system signal, so that in the cycle that integral multiple determined of a predetermined basic cycle, changes described intensity of laser beam.

12. the method at the CD identifying recording layer as claimed in claim 7 is characterized in that, produces described son-modulation signal, so that of described subdata is corresponding to being no less than 20 described pits and mark.

13. a CD has along the pit string or the mark string of spiral or concentric tracks formation, it is characterized in that,

According to the described pit or the length of mark and the interval between described pit or the mark that form along described track, on described CD, write down master data; And

The skew of inside/outskirt from described track center is write down son-data on described CD according to described pit or mark.

14. CD as claimed in claim 13 is characterized in that, corresponding to the computing result of described son-data with the binary number series of being scheduled to, is offset described pit or mark.

15. CD as claimed in claim 14 is characterized in that, described binary number series is M-series random number.

16. CD as claimed in claim 13 is characterized in that, with Maurer Data Record before on the described CD, with described son-data described master data is encrypted.

17. CD as claimed in claim 13 is characterized in that, for an assignment of described son-data is no less than 20 described pits or mark.

18. CD as claimed in claim 13 is characterized in that, is provided with from described track within the described CD of mind-set/the described pit of outskirt or the skew of mark, makes it to be not more than 1/50 of orbit interval.

19. an optical disc reproducing apparatus is characterized in that, comprising:

The reproducing signal pick-up unit is used for detecting reproducing signal from the folded light beam that shines the laser beam on the CD, according to pit string that forms on the described CD or mark string, changes the signal level of described reproducing signal;

Principal solution is transferred device, is used for reproducing the master data with described pit string or mark string form record by making described reproducing signal through scale-of-two-discriminating;

Depart from pick-up unit, be used for the output offset detection signal, its level according to described pit or mark from described track within the described CD of mind-set/skew of outskirt changes; And

Son-modulating device, it is by handling described offset detection signal with reference to described reproducing signal, reproduce according to described pit or mark from described track within the described CD of mind-set/subdata that the skew of outskirt is write down.

20. optical disc reproducing apparatus as claimed in claim 19 is characterized in that, described son-demodulating equipment comprises:

Binary number series generating means is used to produce binary number series, and its position changes corresponding to described pit or mark;

Integrating gear is used for the logic level with reference to described binary number series, to the signal level integration of described offset detection signal; And

The integral result treating apparatus, it detects described subdata by handling described integral result.

21. optical disc reproducing apparatus as claimed in claim 20 is characterized in that, described binary number series is M-series random number.

22. optical disc reproducing apparatus as claimed in claim 19 is characterized in that, by with described subdata encryption being decrypted, described principal solution transfers device to export described master data.

23. an optical disc replay method is characterized in that, may further comprise the steps:

The folded light beam of the described laser beam on being radiated at described CD, reproduce step with the master data of described pit string or described mark string form record; And

Be used for reproducing according to described pit or mark within the described CD of described track mind-set/step of the subdata that the skew of outskirt is write down.

Images