CN1831995B - Optical disk,apparatus and method for manufacturing optical disks, recording or reproducing data from optical disks - Google Patents

Abstract

Described herewith is 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, etc.

Description

The apparatus and method of CD, record or reproduction data of optical disk

The application is that application number is 200410032470.2, 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, can various data be recorded on the CD,, and can not had no adverse effect to reproducing by bootlegging with pit string form data recorded string so that reproduce through 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 be recorded as to key information this seed data etc., can various data be recorded on the CD thus, so that reproduce through the optical pick-up that reproduces serial data; And can not had no adverse effect to reproducing by bootlegging with pit string form data recorded string.

Under the situation of traditional C D CD (CD), the data recorded string through handling, must modulate (eight to 14 modulation) then through EFM, thus the data of recording audio data and so on.

On the other hand, in the boot section of CD inner region, form a management record data district, 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 ability 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 through peel off the pressing mold that diaphragm and aluminium mirror coating produce from object optical disc, the title data that then 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 the 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 write down 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 can the version information recorded with " pit/no pit " be recorded on the pirated CDs so, on pirated CDs, not write down key information with pit width version record.Therefore, through 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.At length say, 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 above that.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 stated, 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 this apparatus and method through 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 through 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 have no 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; Said 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 have no 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 through 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; Compact disc substrate is made machine, is used to make compact disc substrate, and on said substrate, the form that changes with physical arrangement writes down encrypted numerical data and key information; Reflectance coating forms the unit, is used on the substrate of CD, forming reflectance coating; 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; Compact disc substrate manufacturing machine is made compact disc substrate, and on said substrate, the form that changes with physical arrangement writes down encrypted numerical data and key information; Reflectance coating forms the unit and on the substrate of CD, forms reflectance coating; 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 through 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; Compact disc substrate is made machine, is used to make compact disc substrate, and on said substrate, the form that changes with physical arrangement writes down encrypted numerical data and key information; Reflectance coating forms the unit, is used on the substrate of CD, forming reflectance coating; 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 through handling in applied chemistry on the original disc of exposure, thereby changes physical arrangement above that; 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 the precalculated position on the CD is assembled and be radiated to modulated laser beam.

The 6th aspect of the present invention is provided for making the optic disc producing mehtod of CD (this CD has the numerical data through record, can read through the irradiation of laser beam), and comprising: 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 above that with the physical arrangement version through encrypted digital data and key information; Reflectance coating forms step, is used on compact disc substrate, forming 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 forms, thereby reproduces numerical data through the incoming laser beam from its reflectance coating reflection; 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, said 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 through 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; Through handling and reproducing signal reproduction additional data, in reproducing, to have no to reproducing adverse influence with pit or indicia patterns form data recorded.

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; Thereby reproduced additional data rather than unlawfully reproduced CD; Write down such as additional datas such as CD authentication codes, through handling and reproducing signal reproduction additional data, in reproducing, to have no reproducing adverse influence with pit or indicia patterns form data recorded.

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 above that, 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, thereby to be benchmark according to pit or mark with the center of track reproduce the subdata of record to the deviation in the inside/outside district of CD with reference to reproducing signal, and from as the CD of above-mentioned structure can reproduce master data as pit string or mark string; Likewise, 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 master data with pit string and mark string form record with the folded light beam that is radiated at the laser beam on the CD; Reproduce with pit and the subdata of mark 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 be from the optical disc replay two kinds of data of advocating peace, said CD has the various data recorded that are used to forbid bootlegging; Therefore can reproduce with the optical pick-up that is used to reproduce, and be difficult to bootlegging with form data recorded such as pit string.

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, shows the cutting machine that provides for optical disk manufacturing device shown in Figure 1.

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, shows the working condition of the system controller that provides for the transcriber that is used to reproduce CD shown in Figure 4.

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 said 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 through 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, shows the key modulation circuit that provides for optical disc apparatus shown in Figure 12.

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 said optical disc apparatus is used for reproducing from optical disc data, and said CD is through using optical disc apparatus shown in Figure 12 to produce.

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

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

Embodiment

(1-1) in one embodiment structure

Below, with reference to accompanying drawing, with the apparatus and method of describing in detail according to one embodiment of the invention manufacturing CD, 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 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 with the male-female hole on said substrate writes down the digital audio and video signals SC and the second key information signal KY2 through 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 made public under modulated laser beam.

Through 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 through 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 through 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 said 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 accomplishing as stated (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, the 25 generation 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 stated, under the exposure of laser beam, on original disc 26, write down the digital audio and video signals SC and the second key information signal KY2 through double-encryption with cutting machine 3.The data handling procedure that modulation circuit 31 usefulness CD CDs are special-purpose 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 sub-code data comprises TOC (contents table) the subcode generator that is provided by the subcode maker, not shown subcode maker in the accompanying drawing.

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.The used principle of the principle of FM modulation and the address information of recording disk (for example, MD (compact disk)) is identical, and it describes omission in detail.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 3 pairs of boot sections works of cutting machine cut.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 driving main shaft motors 38, so as with the frequency adjustment of FG signal to predetermined frequencies.As stated, 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 comprises electricity-sound-optical element or like with photomodulator 35.Photomodulator 34 changes the direction of propagation by recording laser source 33 emitted laser bundles according to the key information modulation signal KYD that modulation circuit 32 provides.In other words, photomodulator 34 penetrates the laser beam L2 of emission angle varied somewhat 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 stated, 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 on original disc 26, forms spiral trajectory.Corresponding to EFM signal SD, on track, form pit continuously.As stated, 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 made public 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 that forms such as plastic materials such as polycarbonate 4.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 said 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, available CD-R unit has similar structure on CD-R record cell 7 and the market, except the CD-R unit is made into to visit the draw-out area.

Fig. 3 A schematically shows the CD CD of accomplishing as stated 8.Shown in Fig. 3 A, 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 of pit record TOC information.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, through 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 through offering cutting machine from the reproducing signal that CD CD 8 obtains.As a result, the information of the TOC information that is recorded in boot section LI, data field and the information of draw-out area have all been offered cutting machine, 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 through 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 through physics.The second key information signal KY2 that will be recorded in the form of position deviation probably on the LI of boot section in this case, 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 not decipher, so can not reproduce to the encrypted result of the first key information signal KY1.Therefore, pirated CDs is of no use, through the use of said method, has stoped the manufacturing of pirated CDs.

As stated, according to embodiments of the invention, the method through transmitting CD with physics mode with directly reproducing signal is offered any method in the method for 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 receives the control of system controller 64.Spindle Motor 51 rotates CD CD 8.Servo circuit 52 control Spindle Motors 51 and optical pick-up 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.

ECC circuit 56 is proofreaied and correct the error in the output of EFM demodulator circuit 55 according to the ECC (error correction codes) that coding during writing down increases.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 offers DSP62 to it, 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 deciphered, and said encryption is the output signal that is applied to ECC circuit 1 56 through the as above use of the determined second key information signal KY2.The information that will therefrom decrypt second encryption (by second encryption circuit encrypts shown in Figure 1) 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 deciphered first encryption (first encrypted circuit 22 by shown in Figure 1 is encrypted).

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

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

In the processing of accomplishing 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 through A/D converter 61 from the push-pull signal PP of optical pick-up 53, and handle by DSP62, thereby to decoding as the second key information signal KY2 information recorded.Then, in step ST-3, will offer the output terminal of DSP62, and keep and to be worth through the second key information signal KY2 of decoding.

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

At CD CD 8 is under the situation of normal CD (not being pirated CDs), and the first and second key information signal KY1 and KY2 are by decoding correctly.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.Through obtaining under the situation of pirated CDs with the method for 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, need not 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 above that; Reflectance coating forms the unit, is used on compact disc substrate, forming 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 appearing the optical disk manufacturing device of following effect.At length say; 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, and directly offer cutting machine, can not obtain pirated CDs through the reproducing signal that CD reproduced out with manufacturing installation manufacturing of the present invention through physics.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 through 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 on compact disc substrate, forming 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 appearing the optic disc producing mehtod of following effect.At length say; 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 through 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 through 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 appearing the CD of following effect.At length say; According to a ninth aspect of the present invention; Because 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 according to a plurality of key informations; So not only transmit and to invent the CD of the 9th aspect by copy through 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; This method is reproduced data from CD (CD is with physical arrangement version record numerical data, the sense data so that pass through its reflectance coating of laser beam irradiation), 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 appearing the optical disc replay method of following effect.At length say, 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 receives pirate protection through 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, on the CD CD, has write down digital audio and video signals.

At length say, as shown in Figure 7, use such as plastics such as polycarbonate, through the pressing mold injection molding, 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.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; Through 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 in reference to the accordatura sub-code information absolute time of signal reproduction position frequently, and laser beam L is shone on the reflection record film 4 through 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, the pit that repeats for the per second that as above forms distributes 75CD frame (Fig. 7 A) with the island, and is 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 up 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 2 last times of CD CD to intensity 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 the 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.

Say that at length optical pick-up 13A and 13B along the radial motion of CD CD 2, thereby are close to the ground illuminating laser beam through 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 said 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 said 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, is included in the subcode information among the binary signal DBD thereby reproduce.In addition, CD authentication code generation circuit 20 produces the temporal information of dividing (AMIN) and second (ASEC) selectively, and these temporal informations absolute time of self-contained branch, second and the frame in subcode of origin are respectively represented.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 the 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 by minute being recorded in the data on the CD CD 2, and value do, for example, from 0 to 74.Second (ASEC) temporal information will stipulate by second by minute position to be divided into unit of (AMIN) regulation more accurately, and value does, 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, and 1 CD authentication code ED is outputed to " 1 " address by minute (AMIN) and second (ASEC) temporal information decision.Therefore, for each second, ROM (read-only memory) 20B produces 1 CD authentication code ED.

In order to produce CD authentication code ED as stated 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 on the CD CD, has 10 pit edge 1 corresponding to CD authentication code ED 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), through 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; According to the testing result of frame synchronization, to contrast with the timing of the binary signal DBD that will handle by subcode testing circuit 20A, said 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, and 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).At length saying, is 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 on CD CD 2, forms, 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.

Say that at length as shown in Figure 9, through 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 the 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 said 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 said signal waveform; Timing in the scanning pit edge; Because reflectivity changes partly at the respective edges place, so for the variation of reflectivity, signal level departs from partly.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, handle reproducing signal RF so that use, even the signal waveform of reproducing signal RF changes as described above with the same reliability of 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 corresponding to each pit edge partly, 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 confirms whether CD CD 2 is the bootlegging CD.If confirm 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 are kept watch on binary signal BD, and from binary signal BD, sub-code information are decoded.Subcode testing circuit 42 is kept watch on 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; Through 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 anti-phase of digital reproduction signal and polarity reversing signal is 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; From anti-polarity circuit 48 signal is provided then, is equivalent to take place the logic level of the M-series random number data MZ of circuit 46 from M-series.At length say, 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 with M-series random number data MS modulation 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 the 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 from the logical value of reproducing data RX, to select, and said reproduction data RX reproduces when being each second (7350 frame) of the temporal information that in subcode information, is provided with 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 through 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

Through using above-mentioned composition, in the manufacture process of CD CD 2 according to the present invention, form female CD through original key light dish device, make compact disc substrate 3 through 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, and when the laser beam L that makes beam intensity greater than predetermined value shines 2 last times of CD CD, 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 that form with pit that repeats and island writes down.

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

At length say; In optical disc apparatus 1; Convert binary signal BD through binarization circuit 16 to from the reproducing signal RF that optical pick-up 13A obtains; Reproduce channel clock CK through PLL circuit 17 from binary signal BD, binary signal BD is postponed by delay circuit 22, and time delay is according to the mistiming between the time of scanning same position when the time of a position of optical pick-up 13A scanning with 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; Through 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; As optical pick-up 13B during through the edge of pit, edge detect circuit 23 detects regularly, with reference to testing result regularly; Modulation circuit 24 is followed the output signal of gating from XOR circuit 21C; And output signal shaping is become the pulse obtain as the gating result, and makes it have narrow width, thus resulting switching signal MD make from optical pick-up 13B off and on the beam intensity of emitted laser bundle improve.

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 stated on the CD CD 2 of sign M; Though the shake of reproducing signal RF increases; But because the reflectance varies of introducing as stated is atomic little; Reflectance varies does not have negative effect to the information reproduction with pit string form record, stable with 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 through logic level 1 wherein and 0, thereby has write down the 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 receives noise, recording disk authentication code ED consistently.

Though the digital audio and video signals D1 (also recording disk is differentiated as stated) with the form of pit string record on CD CD 2 is to reproduce through 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 above that.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, so 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 through 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 through 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 through 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 stated 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.

At length say; When reproduction is recorded in the 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 reference to the M-series random number data MS that writes down together through the frame synchronization that detects.

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 signals or is made the digital signal of polarity anti-phase with reference to M-series random number data MZ; Thereby the reproduction data RX of reproduction multi-value data form, it representes the logic level of CD authentication code ED.

When reproducing CD CD 2, totalizer 53 selectively adds up with totalizer 52 and reproduces 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.(because CD authentication code ED receives the serial interference of M-during writing down) can very stably be reproduced CD authentication code ED when CD authentication code ED decodes according to total signal.

(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, through 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, has no negative effect for the reproduction with the digital audio and video signals of pit string form record.

Because with reference to subcode, 1 of CD authentication code is defined as 1 second, and 1 of regulation CD authentication code has 10 pit edge that supply record at least, when reproducing, reproduce the CD authentication code consistently, have no The noise.

Because supply record with M-series random data modulation CD authentication code, be not easy between noise and CD authentication code itself, to differentiate so the CD authentication code is recorded into.Therefore be difficult to seek and the optical analysis discs authentication code.In addition, reproduce the CD authentication code consistently and when reproducing, have no 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 from noise, differentiating.

Because selector switch 49 is selectively handled digital reproduction signal to produce the CD authentication code through 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 forming this type 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 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 through 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, can bright various modulation such as 1-7 modulation, 8-16 modulation and the 2-7 of being applied to of this law 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, can the present invention 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, can the present invention 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.

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

Say that at length in optical disc apparatus 1, rotating shaft motor 4 makes original disc 2 rotations, remain on the FG signal generating circuit output FG signal of rotating shaft motor 4 bottoms, 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 make public.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 is synchronously shifted to outskirt from the inner region of CD 2 with object lens 13 boths through the threading device (not shown) and the rotation of CD step by step.

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, on CD 2, forms helical trajectory.In addition, in the processing that forms this track, therefore optical disc apparatus 1, forms pit string along track in order according to the on/off state of EFM signal S2 control laser beam L1 through light deflector 8A.In addition, optical disc apparatus 1 skew laser beam L2 is through 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 through control; Make its tracking that identical characteristic arranged with traditional C D CD player; From serving as the optical disc replay data that make on the basis with this original disc, that is, the reproduction of record data does not receive 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 order 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 in predetermined CD disk format, produces EFM signal S2.Say that at length modulation circuit 9 is added to correction codes on the output data S1 and sub-code data SC of encrypted circuit 15 outputs, 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)s.

Figure 13 is the more detailed block diagram of key modulation circuit 10.In key modulation circuit 10, 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 order latchs EFM signal S2, and the continuous logic level of definite signal S2, therefore from EFM signal S2, detects synchronizing pattern.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 keep watch on EFM signal S2 and according to EFM signal S2 antithetical phrase code decoding.In addition, subcode testing circuit 22 is kept watch on the temporal information and the output 1-that are included in the subcode of decoding and is detected 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 exported the data by its preservation according to the count value CT of counter 23, and it is used as the address.The count value CT of counter 23 and synchronizing pattern are that unit changes with per second 98 frames periodically synchronously.Therefore 98 types of data of data selector 24 outputs are synchronously exported with the synchronizing pattern as the address that obtains from count value CT singly.The count value of counter 23 detects pulse SECP second according to 1-and changes on several seconds intercycle property ground, thus data selector 24 several seconds intercycle property repeat to export this 98 types of data.

In this embodiment, the output through in the several seconds, repeating the 1-bit data (said one digit number according to be to each regulation in 98 types of 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, the probability that logic level 1 and 0 occurs is identical.As a result, circuit 25 output random number data MS take place in M-series, and it is the scale-of-two serial pseudo random number synchronous with clock CK, therefore in a frame period, repeats identical figure, 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.At length say; 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, serving as that the scanning start edge of each pit is corresponding to the rising edge of EFM signal S2 on the CD made of basis with original disc 2.The result; In a time interval; Trigger circuit 28 are preserved the logic level of the latched data MS1 of institute, and the said time interval is when in order from XOR circuit 27 output data MS1 (as clock period in the reference cycle that is used to form each pit the time) and when latch output data MS1, (start the timing of each pit and accomplish the formation of a pit at least to its regulation) time interval between twice.

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 ability 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 like the method and are shaped, and have therefore made female CD.Make pressing mold with female CD then.In addition, use with the identical method of original CD CD manufacture process and make CD with pressing mold.

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 along track singly 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 of voice data is deciphered to the skew record in the inside/outside district of CD according to each pit.

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, on the light beam receiving element, receives this light beam with so-called push-pull method, therefore produces push-pull signal PP; 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 said 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 synchronously through demodulating data, 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 is reproduced data with 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 keep watch on binary signal BD and demodulation subcode from binary signal BD.In addition, subcode testing circuit 52 is kept watch on the temporal information and the output 1-that are included in the demodulation sub-code information and is detected pulse SECP second, and when temporal information changed one second, its signal level rose.

Pit detection circuit 54 latchs binary signal BD in order by the timing of channel clock CCK and continuous two is compared through latching the BD signal each other, 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 centers on the center output center detection signal CTP of each pit with identical method detection pit decline timing and according to the testing result of respective dimple rise time.

Sync detection circuit 55 reference channel clock CCK in order latchs binary signal BD, and the continuous logic level of definite binary signal BD, therefore detects synchronizing pattern.The result; 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 began regularly, the signal level that pulse is set only rose 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; Pass through the inner ROM (read-only memory) of accessed according to channel clock CCK 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 in optical disc apparatus 1, carrying out, 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 polarity anti-phase and the output polarity reversing signal of digital reproduction signal.

The timing of detection signal PT on the edge of; Latch cicuit 59 latchs M-series random number data MX; And in a time, keep the latched data MX of institute; The said time be when XOR circuit in key modulation circuit 10 during deal with data MX as said with reference to Figure 13, that is, and the time interval when beginning to form pit and when accomplishing the formation of pit between two time.

Selector switch 60 is according to selecting digital signal that directly gets into from A/D change-over circuit 57 or the reversed polarity digital signal that gets into from anti-polarity circuit 58 from the logic level of the output data MZ of latch cicuit 59 outputs, and the signal of output warp selection.In other words, the digital signal that selector switch is selected and output directly gets into 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 said key information is transferred with M-series random number data MS through 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 receives from the binary data of binary circuit 64 outputs in the rise time that pulse FSET is set in order, transmits 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 and is kept at the pre-determined bit 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 in 2 last times of original disc, in optical disc apparatus 1, the voice data D1 that records machine 3 outputs from digital audiotape gets into coding circuit 15 and there with predetermined key information KY coding.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 order, thereby on object optical disc, from the inner region to the outskirt, form helical trajectory.Therefore will be through the voice data D1 of coding 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, possibly provide voice data D1 to cause and do not have key information KY not reproduce through coding, same, 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, in practical application, can reproduce voice data with enough degree of accuracy with pit string form record.

At length say; 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, circuit 25 generation random number data MS take place in M-series, 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, makes logic level 1 and 0 with much at one probability appearance from the modulated output data of XOR circuit 27.

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 like the method.And according to this logic level, the focus point that makes laser beam L3 through light deflector 8B is to the skew of the inside/outside district of CD 2, therefore according to the inside/outside district of CD 2 skew recording key information KY.

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 the pit of random offset writes down from the track center extremely difficulty look for.More correctly, promptly use microexamination optical disc data record surface, can only see as if, 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, squinted to interior and the outskirt at regulation center in order to make pit, and 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.Therefore be difficult to whether inspection has key information KY to exist from the waveform of these signals.

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 can easily detect the skew of pit according to its position of data M S1 skew, 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, in EFM demodulator circuit 38, handles 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 through 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 possibly detect, the skew to the inside/outside district of the CD with simple structure 2 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.

At length say, in key testing circuit 42, convert offset detection signal HPP to digital signal by channel clock, make the polarity anti-phase by polarity switching 58 then by A/D change-over circuit 57.

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

At length say; 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 value AX (it is the result that scale-of-two is differentiated) through adding up 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 through 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.

Going up under the situation of reproducing audio data from the CD (only so reproducing pit string) of bootlegging, with not reproducing 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 the optical pick-up that supplies 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 the optical pick-up that supplies 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 of encrypting with this key information with the form record of pit string so that prevent bootlegging effectively.

In addition, because before the record key, with binary level it is modulated, 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.

At length say, 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, through 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.Result as test finds, 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, differentiate through scale-of-two through the value that adds up though make in totalizer, thereby reproduce key information that 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 stated, 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 pit string form data recorded string 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 like the subdata of key information and so on; So can write down various data,, but can not carry out bootlegging according to the method for reproducing so that produce various data with the optical pick-up that is used to reproduce pit string form data recorded string.

Claims (22)

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 said homophony system signal laser beam irradiation at CD, thereby on said CD, forms pit string and mark string;

Son-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 said laser beam being shifted to the inside/outside district according to said sub-modulation signal.

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

Pick-up unit regularly is used to detect the timing at the edge of said 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 from said subdata, producing said sub-modulation signal according to said binary number series and said detected timing.

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

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

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

6. optical disc apparatus as claimed in claim 1 is characterized in that said son-modulation signal occurrence device produces sub-modulation signal, so that has and be no less than corresponding to said 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 said homophony system signal, through said CD illuminating laser beam is formed the step of pit string or mark string on said CD;

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

According to said son-modulation signal, the step that makes the point of irradiation of said laser beam be partial to the inside/outside district of said 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 said pit and mark and the timing of predetermined binary number series, from said subdata, produces said son-modulation signal.

9. the method at the CD identifying recording layer as claimed in claim 8 is characterized in that, said 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 said subdata, through said master data is encrypted, produces said 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 said homophony system signal, so that in the cycle that integral multiple determined of a predetermined basic cycle, changes said intensity of laser beam.

12. the method at the CD identifying recording layer as claimed in claim 7 is characterized in that, produces said son-modulation signal, so that of said subdata is corresponding to being no less than 20 said 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 said pit or the length of mark and the interval between said pit or the mark that form along said track, on said CD, write down master data;

According to the skew of said pit or mark inside/outskirt, on said CD, write down son-data from said track center; And

Setting from said track within the said CD of mind-set/the said pit of outskirt or the skew of mark, make it to be not more than 1/50 of orbit interval.

14. CD as claimed in claim 13 is characterized in that, corresponding to said son-data and the serial computing result of predetermined binary number, said pit or mark squint.

15. CD as claimed in claim 14 is characterized in that, said 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 said CD, with said son-data said master data is encrypted.

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

18. 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 said CD or mark string, changes the signal level of said reproducing signal;

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

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

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

19. optical disc reproducing apparatus as claimed in claim 18 is characterized in that, said son-demodulating equipment comprises:

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

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

The integral result treating apparatus, it detects said subdata through handling said integral result.

20. optical disc reproducing apparatus as claimed in claim 19 is characterized in that, said binary number series is M-series random number.

21. optical disc reproducing apparatus as claimed in claim 18 is characterized in that, through with said subdata encryption being deciphered, said principal solution transfers device to export said master data.

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

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

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

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