JP2001135019A - Optical disk recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device capable of easily preventing an illegal copy with a simple means. SOLUTION: In the optical disk recording/reproducing device for recording/ reproducing the disk, in which the data is broken into h-byte unit (h: natural number), an identification address, and error detection code and an error correction code are added to constitute a sector, the sector is divided into i-byte unit data (i: natural number), a synchronizing signal is added to constitute a frame, and the frame data are modulated and recorded, a conversion means 107b for changing the contents or positions of additional information on the identification address, the error detection code, the error correction code and the synchronizing signal, etc., and an inverter means 107a for changing the contents or the positions of the additional information changed by the conversion means to the contents or positions of the additional information before the change are provided. Thus the data added with the additional information changed by the conversion means are recorded on the disk, or are changed by the inverter means to reproduce the recording data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus on which digital signals are recorded.

[0002]

2. Description of the Related Art A DVD (Digital Video Disc) is a medium having a capacity approximately seven times that of a CD (Compact Disc). As a medium for recording data on a DVD, there are a DVD-RAM, a DVD-R, and a DVD-RW. The recordable media can be said to be the most promising field in the future as seen in the growth of CD-Rs in recent years.

[0003] In the format of the information area of a DVD, a track is formed by continuous pits, the center of the track is the center of the pit, and the track has a continuous spiral shape.

[0004] The physical sectors on the disk are arranged as shown in FIG. In a track of a single layer as shown in the figure, there are no gaps in the physical sectors of the track, and from the beginning of the lead-in area 201 to the lead-out area 203.
Are placed continuously until the end. The physical sector number is
From the beginning of the lead-in area 201 to the lead-out area 2
The data area 202 continuously increases until the end of 03, and the data area 202 is allocated from the physical sector address 30000h (Hex).

The structure of the physical sector is usually formed in accordance with the processing order (the flow of the encoding process) as shown in FIG. As shown in the figure, the sectors are “data sector” 305 and “record sector” 30 according to the stage of signal processing.
7, and "physical sector" 308.

First, the formation of the data sector 305 is as follows.
IED data is added to ID data 301 (ID +
IED) data 302 is formed and then CPR_MA
I data and main data are added, and [(ID + IE
D) + CPR_MAI data + main data] 303 is formed. Further, an error detection code (EDC: ErrorD)
In addition, a data sector 304 before scrambling is formed by addition of a selection code, and scramble processing is performed on main data of the data sector 304 to form a data sector 305 after scrambling.

As shown in FIG. 8, the data sector 305 has 12 bytes of identification address information composed of data such as ID, and 2048 bytes of main data (160 bytes + 1
72 bytes × 10 + 168 bytes) and an error detection code (EDC: Error Detection Code)
e) It is composed of 2064 bytes (172 bytes × 12 rows) consisting of 4 bytes.

[0008] Further, as shown in FIG.
Sector information (Data FieldInformati)
on) 1 byte and sector number (Data Field)
Number) consists of 3 bytes and has sector information 4
05 is the format type (Sec
to Format Type 407, Tracking Method 408, Reflectivity 409, Area Type (Area Type) 411 representing data area and lead-in / lead-out area as shown in FIG. 6, read-only data Or, it is composed of a data type (Data Type) 412 indicating whether it is data for additional recording / rewriting, and a layer number (Layer Number) 413 indicating a layer of the disc. The sector number 406 is a serial number assigned to the data area, and the data area is allocated with 030000h at the top as shown in FIG. The EDC 404 is a check code attached to 2060 bytes of the data sector before scrambling. The EDC code 404 checks whether the scramble is correct or not, and after performing error correction, whether erroneous correction has been performed.

Next, as shown in the processing order of FIG. 7, an ECC block as shown in FIG. 9 is formed based on the 16 data sectors 306 scrambled as information fields. The ECC block, as shown in FIG.
Reed-Solomon RS (208, 192, 17) in which 172 bytes × 192 rows equal to 172 bytes × 12 rows × 16 data sectors are used as information fields and 16 bytes of outer code parity PO502 are added to each of 172 columns.
And an inner code of Reed-Solomon RS (182, 172, 11) in which 10 bytes of inner code parity PI501 are added to all 208 rows including outer code parity PO502.

[0010] The ECC block shown in FIG.
, The data is interleaved, modulated and recorded on the disk. After interleaving,
As shown in FIG. 10, 16 rows of the outer code parity PO are inserted one by one for every 12 rows of the data area, and a portion of 13 rows × 182 bytes in the ECC block after the row interleaving is configured as 16 recording sectors 307. Is done. The recording sector 307 is a sector after encoding the ECC block. One recording sector is configured by adding an outer code parity PO and an inner code parity PI to a data sector 305, and the outer code parity PO and the inner code parity PI are 1
It is formed in an ECC block formed for every six data sectors 305.

Next, for 13 rows × 182 bytes (2366 bytes) of one recording sector 307 shown in FIG.
By sequentially modulating each row from the 0th row while adding a 2SYNC code before the 1st and 91st columns, FIG.
A frame composed of one physical sector 308 as shown in FIG.

As shown in FIG. 1, one physical sector 308 is composed of 13 sets × 2 SYNC frames, and is composed of 2418 bytes before modulation. Further, one physical sector 308
Is subjected to 8/16 modulation for converting the data into 8-bit input data and 16 channel bit codes, and recorded on the disk.
The combinations of the SYNC codes are arranged as shown in the figure, and the beginning of the sector can be specified by SY0 (SYNC code 0), and each line can be specified by SY1 to SY4 and SY5, SY6, SY7 which are cyclically repeated. It has become. The error correction is formed by collecting 16 sectors, but the head of the block is the I which comes after SY0.
The D information is read and recognized by an address divisible by 16. Therefore, SY0, that is, the head of the sector has a high importance in decoding data. In addition, since a row can be specified in the sector structure as shown in the figure, if several rows are read, the position of SY0 can be predicted by using the periodicity.

As described above, since the physical sector on the disk is formed as described above, the DVD-RAM or DVD-RAM
When recording data on a medium such as R, it is necessary to record in a form that satisfies the above standards. As a result, the disk on which data is recorded by the recording device can be reproduced by a reproduction-only device.

In the reproducing apparatus, it is possible to reproduce the data by reversing the above-described processing of the configuration of the physical sector, assuming that the data is recorded on the disk in accordance with a predetermined specification. The data recorded on the disk is demodulated, and when a valid SYNC code is detected, the position of the sector is detected from the ID at the head of the sector, and the main data is demodulated. The demodulated data is subjected to error correction using parity and EDC error check after the interleave processing, and output as reproduction data.

[0015] As described above, if all processes are controlled in accordance with one unified standard, media recorded by any recording device can be reproduced by any reproducing device. It is also possible to reproduce illegally copied media and illegally copied data, and therefore, it was necessary to perform additional processing to prevent illegal copying and pirated discs. Conventionally, as a means for preventing illegal copying, various methods such as performing various processes such as authentication and embedding a digital watermark or the like in the disc itself so that a disc manufactured in an improper form cannot be reproduced. Was.

Japanese Unexamined Patent Publication No. Hei 8-286840 discloses that a data reproducing operation of a conventional information reproducing apparatus is performed by recognizing only a sector address, and a leading sector on an information recording medium is used. Only the address is set in accordance with the physical sector arrangement order, and the other sector addresses are recorded by changing the arrangement order and recording data.
At the time of reproduction, the information reproducing apparatus of the invention of the publication can recognize that the recording order is different and can normally reproduce the information. However, other information reproducing apparatuses other than the invention of the publication recognize that the recording order is different. There is disclosed a technology for preventing reproduction of an illegally copied information recording medium by making use of the fact that it cannot be normally reproduced.

[0017]

However, the above-mentioned physical method such as digital watermarking causes an increase in the manufacturing cost, and the method disclosed in the above-mentioned publication requires not only the sector addresses but also the arrangement order of interleaved addresses. Therefore, it is necessary to control the arrangement of both addresses, and there is a problem that the control device becomes complicated.

In view of the above problems, an object of the present invention is to provide
While converting a part of the data component based on one set standard by a simple means and recording it on a disc,
It is an object of the present invention to provide an optical disk recording / reproducing apparatus capable of reproducing only an apparatus having an inverse conversion function of the converted data and easily preventing illegal copying.

[0019]

The present invention employs the following means in order to solve the above-mentioned problems.

The first means is that data is h (h: natural number)
A sector is formed by adding a discriminating address, an error detection code, and an error correction code in units of bytes, and the sector is divided into data of i (i: natural number) bytes, and a frame is formed by adding a synchronization signal. In an optical disk recording / reproducing apparatus configured to record and reproduce a disk on which frame data is modulated and recorded, the content or position of additional information such as an identification address, an error detection code, an error correction code, and a synchronization signal is changed. Conversion means, and inverse conversion means for changing the content or position of the additional information changed by the conversion means to the content or position of the additional information before change, wherein the additional information changed by the conversion means is added. The recorded data is recorded on a disk or modified by the inverse conversion means to reproduce the recorded data.

The second means is to convert data into h (h: natural number)
The sector is divided into byte units, an identification address composed of sector information and a sector number, an error detection code, and an error correction code are added to form a sector. The sector is divided into data of i (i: natural number) bytes. In an optical disc recording / reproducing apparatus for recording and reproducing a disc on which a frame is formed by adding a synchronization signal and further modulating and recording frame data, the sector number including a leading sector number is changed from a predetermined value to another value. It has a conversion means for converting to a value,
Data to which an identification address having a sector number converted by the conversion means is added is recorded on a disk.

The third means is the second means, wherein the sector number of the optical disk on which data is recorded in the sector configuration to which the identification address having the sector number converted by the conversion means is added is set before the conversion. Inverting means for converting the data to the sector number value, and reproducing the recorded data by converting the data by the inverse converting means.

The fourth means is an identification address conversion circuit, which divides data into units of h (h: natural number) bytes and adds an identification address composed of sector information and a sector number, an error detection code, and an error correction code. To divide the data into i (i: natural number) byte units,
A frame is formed by adding a synchronization signal, and further used for an optical disk recording / reproducing apparatus for recording / reproducing a disk on which frame data is modulated and recorded. Is converted to another value.

The fifth means is to convert data into h (h: natural number)
A sector is formed by adding a discriminating address, an error detection code, and an error correction code in units of bytes, and the sector is divided into data of i (i: natural number) bytes, and a frame is formed by adding a synchronization signal. An optical disk recording / reproducing apparatus configured to record and reproduce a disk on which frame data is modulated and recorded, further comprising a conversion unit for converting a predetermined value of the error detection code from a predetermined value to another value, It is characterized in that data composed by adding the error detection code converted by the conversion means is recorded on a disk.

A sixth means is the fifth means, wherein the error detection code is converted from the error detection code before the conversion to the optical disk on which the data added with the error detection code converted by the conversion means is recorded. It has an inverse conversion means for converting into a value, and the recorded data is reproduced by conversion by the inverse conversion means.

The seventh means is an error detection code conversion circuit, which divides data into units of h (h: natural number) bytes and converts an identification address composed of sector information and a sector number, an error detection code, and an error correction code. A sector is formed by adding the data, divided into data of i (i: natural number) bytes,
A frame is formed by adding a synchronization signal, and further used in an optical disk recording / reproducing apparatus for recording / reproducing a disk on which frame data is modulated and recorded. When recording, the predetermined value of the error detection code is changed from a predetermined value. It is characterized in that it is converted to another value.

The eighth means is that data is h (h: natural number)
The sector is divided into bytes, and an identification address, an error detection code, and an error correction code added to the head position of the sector are added to form a sector, and the sector is i (i: natural number)
In an optical disc recording / reproducing apparatus that divides data into byte units, adds a synchronization signal to form a frame, and further records / reproduces a disk on which frame data is modulated and recorded, the position of the identification address is set in the sector. And a conversion means for changing the position of the identification address by the change means, and recording the data on the disk.

In a ninth aspect, in the eighth aspect, the position of the identification address is changed to the position before the change with respect to the optical disk on which the data to which the identification address whose position has been changed by the conversion means is recorded. It has an inverse conversion means for changing, and the recorded data is reproduced by the change by the inverse conversion means.

A tenth means is an identification address position changing circuit, which divides data into units of h (h: natural number) bytes, and stores an identification address, an error detection code, and an error correction code added to the head position of a sector. In addition, a sector is formed, the sector is divided into data in units of i (i: natural number) bytes, a synchronization signal is added to form a frame, and a disk on which the frame data is modulated and recorded is recorded. Used in an optical disk recording / reproducing apparatus for reproducing, wherein the position of the identification address is changed to another position in the sector at the time of recording.

The eleventh means divides the data into units of h (h: natural number) bytes, adds an identification address, an error detection code, and an error correction code to form a sector, and divides the sector into i (i: natural number) A) an optical disk recording / reproducing apparatus which divides the data into bytes and adds a synchronization signal to form a frame, and further records / reproduces a disk on which the frame data is modulated and recorded; And a conversion unit for converting the arrangement between the synchronization signals, and recording the data formed by converting the arrangement of the synchronization signal on the disk.

[0031] The twelfth means is the eleventh means,
In the optical disk on which the data to which the synchronizing signal whose arrangement has been changed by the converting means is added, there is provided an inverse converting means for changing the arrangement of the synchronizing signal to the arrangement before the change, and the change by the inverse converting means is provided. And reproducing the recorded data.

The thirteenth means is to divide the data into units of h (h: natural number) bytes as a synchronization signal conversion circuit, add an identification address, an error detection code, and an error correction code to form a sector. It is used in an optical disk recording / reproducing apparatus that divides data into units of i (i: natural number) bytes, adds a synchronization signal to form a frame, and further records / reproduces a disk on which frame data is modulated and recorded. In some cases, the arrangement between the synchronization signals in the sector is converted.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a block diagram showing the configuration of an optical disk recording / reproducing apparatus according to this embodiment.

In the figure, reference numeral 101 denotes an optical disk, 10
Reference numeral 2 denotes a pickup for recording / reproducing data on the optical disk 101, and reference numeral 103 denotes a spindle motor for rotating the disk. Reference numeral 104 denotes a servo for controlling the optical pickup 102 and the like. Reference numeral 105 denotes a read channel for performing waveform equalization processing, binarization, and synchronous clock generation of an analog reproduction signal read from the disk 101. 1
Reference numeral 06 denotes a decoder for performing processing such as demodulation and error correction of the read data, and reference numerals 109a and 109b denote RAMs for temporarily storing data. Reference numeral 108 denotes an ID detection circuit for detecting an ID portion from the read data, 107a and 1
07b is an ID for converting the ID according to a certain rule.
It is a conversion circuit. Reference numeral 110 denotes a decoding processing unit that performs a decoding process on data. Reference numeral 111 denotes an encoder that performs processing such as modulation and addition of an error correction code when writing data;
Reference numeral 4 denotes a laser driver. Reference numeral 112 denotes a modulation circuit that performs data modulation processing, and 113 denotes an encoding processing unit that performs encoding processing on data. Reference numeral 115 denotes an interface for controlling input / output of data with the host device, and reference numeral 116 denotes a microcomputer that controls the system.

Next, the operation of the optical disk recording / reproducing apparatus according to this embodiment will be described. First, the flow of recording on a normal disc will be described. Interface 1
The data input from 15 is subjected to scrambling processing and encoding processing such as addition and modulation of an error correction code via the RAM 109b in the encoder circuit 111. The processed data is used to control the optical pickup 102 via the laser driver 114 and
Record on 01. In the encoder circuit 111, data is configured in sector units along the flow of encoding as shown in the processing order of FIG. In a normal reproducing operation, data is read by the optical pickup 102, and binarization and generation of a synchronous clock are performed in the read channel 105. Further, in the decoder circuit 106, RAM1
The signal is demodulated, error-corrected, and descrambled through the interface 09a, and output to the interface 115. At this time, the processing is performed along the reverse of the encoding flow as shown in the processing order of FIG. The position of the row in one ECC block is recognized based on the SYNC code and the ID value read from the disk, and then error correction and descrambling are performed in ECC block units or sector units, so that the main data can be decoded. Will be Since the first physical sector number of data determined by the physical standard is assigned to 30000h, in order to enable reproduction by any reproducing apparatus, the first sector number must always be set in accordance with the physical standard during recording. 30,000
h.

Next, the ID conversion circuit 107 of this embodiment
The operation of the optical disk recording / reproducing apparatus including the a and 107b will be described.

As described above, when data is recorded on the optical disk 101, the data area is allocated from 30,000h, so the first sector number must be 30,000h. However, in the present embodiment, the ID conversion circuit 10
At step 7b, conversion is performed so that the value incremented by 1 is assigned, and recording is performed. Accordingly, the encoder processing unit 111 performs ID code addition and scramble processing via the RAM 109b, further performs error correction code addition to form a data sector, and converts a predetermined value of the sector number assigned to each sector into an ID conversion circuit. The value is incremented at 107b, modulated by the modulation circuit 112, and output. That is, after the encoding process, the sector data assigned to the top 30,000h is
The conversion is performed by the conversion circuit 107b so as to be assigned to 001h. The other addresses are similarly converted and recorded. If an optical disc recorded in this way is reproduced by setting the first sector number to 30000h in the reproducing circuit, the disc recorded as the first 30001h cannot be correctly reproduced. On the other hand, in the optical disc recording / reproducing apparatus according to the present embodiment, reproduction is enabled by using a circuit for performing a reverse conversion of the above-described conversion at the time of recording. That is, the sector number 3 found in the ID detected by the ID detection circuit 108 from the optical disc 101
0000h is converted by the ID conversion circuit 107a, and is decoded as the first 30000h. As a result, the data before the conversion recording can be normally reproduced. In addition, a conventional read-only disc (first 30
000h), it is only necessary to recognize the read-only medium from the sector information 405 and switch to decoding with the head sector number remaining at 30000h, and perform normal reproduction as in the conventional case. it can. As described above, by making a predetermined change to the sector number at the time of recording, it is possible to make it possible for only an apparatus including a special reproduction circuit to reproduce at the time of reproduction. As described above, since the discs recorded by the optical disc recording / reproducing apparatus of the present embodiment can be reproduced by only a limited number of apparatuses, it is possible to prevent unauthorized copying on recordable media.

In this embodiment, the ID conversion circuit 10
Although the circuit for recording the sector number by incrementing the sector number by one is used in 7b, the same configuration can be applied in any conversion for the purpose of encrypting a predetermined value of the sector number. When data is recorded on the optical disc 101, the sector number of the sector data is encrypted to give a value different from the first number 30000h. Therefore, the conventional reproducing circuit cannot read the sector number correctly, so that normal reproduction cannot be performed. On the other hand, in the apparatus according to the present embodiment, at the time of reproduction, the circuit that owns the key for decrypting calculates a predetermined value of the sector number before encryption, and performs decoding processing on the data using the calculated value. Playback can be performed.

As described above, according to the optical disk recording / reproducing apparatus according to the present embodiment, recording can be performed by converting a sector number including a leading sector number from a predetermined value to another value. Further, the optical disk recorded by the optical disk recording / reproducing apparatus according to the present embodiment cannot be easily reproduced by the conventional reproducing apparatus, so that illegal copying at the time of recording can be prevented. Further, the optical disk recording / reproducing apparatus according to the present embodiment can be easily configured only by adding only the ID conversion circuits 107a and 107b having the above functions to the conventional apparatus.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a block diagram showing the configuration of the optical disk recording / reproducing apparatus according to the present embodiment.

In FIG. 8, reference numerals 801a and 801b denote EDC conversion circuits for converting a predetermined value of EDC attached to a sector, and 802 denotes a demodulation circuit for detecting data ID and demodulating the data. The other reference numerals correspond to the same reference numerals shown in FIG.

Next, the EDC conversion circuit 801 of this embodiment
The operation of the optical disk recording / reproducing apparatus including the a and 801b will be described.

The EDC is originally data 206 in sector units.
This is a check code added to 0 bytes, and is used as an EDC error when scramble of data after error correction during reproduction is incorrect or erroneous correction. ED
By configuring so as not to output data to the interface 115 at the time of the C error, the error data can be prevented from being reproduced. In the present embodiment, when data is recorded on the optical disc 101, a predetermined value of EDC is converted and recorded. That is, the interface 11
Encoder processing unit 11 for the data input from
After performing an encoding process such as scrambling or adding an error correction code in step 3, the EDC conversion circuit 801b increments a predetermined value of the EDC added to the data in sector units by one and outputs it. In the modulation circuit 112, E
The sector data constituted by incrementing a predetermined value of DC by one is modulated and recorded. For this reason, when an ordinary reproducing apparatus reproduces the optical disk on which the converted EDC value is recorded, an EDC error occurs even if the scramble is correct and erroneous correction is not performed. On the other hand, according to the optical disk recording / reproducing apparatus according to the present embodiment, when reproducing the disk, the demodulation circuit 802 detects and demodulates the head of the sector, and the EDC conversion circuit 801b calculates the EDC value in the data sector demodulated. By decrementing by 1, it returns to the value before conversion and correct EDC
Allows you to check. As described above, since the discs recorded by the optical disc recording / reproducing apparatus of the present embodiment can be reproduced by only a limited number of apparatuses, it is possible to prevent unauthorized copying on recordable media.

In this embodiment, the method of incrementing the predetermined value of EDC by 1 has been described.
Since the purpose is to encrypt a predetermined value of C,
Whatever value is converted, the same can be realized. As described above, when data is recorded on the optical disc 101, a predetermined value of the EDC is encrypted and a different value is given to the EDC value. At the time of reproduction, the conventional reproduction circuit cannot read the EDC value correctly. However, normal reproduction cannot be performed. On the other hand, in the apparatus of the present embodiment, at the time of reproduction, the ED before being encrypted by the circuit having the key for decrypting the data is used.
The data can be decoded using the predetermined value of C, and the data can be normally reproduced.

As described above, according to the optical disk recording / reproducing apparatus of the present embodiment, recording can be performed by converting a predetermined value of the EDC code. Further, the optical disk recorded by the optical disk recording / reproducing apparatus according to the present embodiment cannot be easily reproduced by the conventional reproducing apparatus, so that illegal copying at the time of recording can be prevented. In addition, the EDC conversion circuits 801a and 801
By simply adding only 01b, the optical disk recording / reproducing apparatus according to the present embodiment can be easily configured.

Next, a third embodiment of the present invention will be described with reference to FIGS.

FIG. 3 is a block diagram showing the configuration of the optical disk recording / reproducing apparatus according to the present embodiment.

In the figure, reference numerals 901a and 901b denote ID position changing circuits for changing the position of the ID at the head position of the sector. The other reference numerals correspond to the same reference numerals shown in FIG.

FIG. 4 is a diagram showing the configuration of the data sector 305 whose ID position has been changed by the ID position changing circuit.

Next, the ID position changing circuit 90 of the present embodiment
The operation of the optical disc recording / reproducing apparatus including the optical discs 1a and 901b is described.

The ID is identification data information with 4 bytes added to the head of the sector as shown in FIG. In this embodiment, as shown in FIG. 4, the arrangement order of the components of the 12-byte identification information data added to the sector data is changed, and the ID value is changed to a position other than the head of the original sector for recording. I do. That is, at the time of recording, for the encoded sector data such as scramble and error correction code addition, the process is performed by changing the data arrangement, especially the ID position, only in the first row of the sector by the ID position change circuit 901b. Do. Therefore, when playing back an optical disk on which an ID position has been changed and recorded by a normal playback device, the sector information cannot be read because the ID value does not exist at the original ID position, and the normal playback is performed. I can't. On the other hand, according to the optical disk recording / reproducing apparatus according to the present embodiment, at the time of reproducing the disk, the head of the data detected from the optical disk has an I
The position is changed by the D position change circuit 901a so as to return to the original sector structure as shown in FIG. As a result, the decoding processing unit 110 performs processing on the data having the conventional sector structure, so that reproduction can be performed as usual. As described above, since the discs recorded by the optical disc recording / reproducing apparatus of the present embodiment can be reproduced only by a limited number of apparatuses, it is possible to prevent unauthorized copying on recordable media.

As described above, according to the optical disk recording / reproducing apparatus according to the present embodiment, the ID added to the sector data
Can be recorded by changing the position of. Further, the optical disk recorded by the optical disk recording / reproducing apparatus according to the present embodiment cannot be easily reproduced by the conventional reproducing apparatus, so that illegal copying at the time of recording can be prevented. Further, the optical disk recording / reproducing apparatus according to the present embodiment can be easily configured only by adding only the ID position changing circuits 901a and 901b having the above functions to the conventional apparatus.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a block diagram showing the configuration of the optical disk recording / reproducing apparatus according to this embodiment.

In the figure, 1001a and 1001b
Reference numeral 1001 denotes a SYNC conversion circuit for converting a SYNC pattern, and reference numeral 1002 denotes a SYNC detection circuit for detecting a SYNC pattern recorded on an optical disk. The other reference numerals correspond to the same reference numerals shown in FIG.

Next, the SYNC conversion circuits 1001a and 1001a
The operation of the optical disc recording / reproducing apparatus including the 01b will be described.

As shown in FIG. 11, the SYNC code is an element necessary for specifying the head and row of the sector data. In the present embodiment, when data is recorded on an optical disc, recording is performed by changing the pattern of the SYNC to be added. That is, the SYNC conversion circuit 1001b performs conversion, for example, by exchanging SY5 and SY6 so that the SYNC pattern added to the data in sector units differs from the original combination as shown in FIG. For this reason, when an optical disc on which a SYNC pattern is changed and recorded is reproduced by a normal reproducing apparatus, since the SYNC pattern does not exist at the original SYNC pattern position, even if SYNC is detected, the head of the sector is recognized. Even if it did, the line pattern could not be specified because the pattern of the code had changed. Further, when SY0 cannot be detected, the periodicity is changed due to a change in the code pattern, so that it is impossible to predict the position of SY0, and it is not possible to normally reproduce the optical disk. On the other hand, according to the optical disk recording / reproducing apparatus according to the present embodiment, at the time of reproducing a disk, the detected SYNC code is converted into a correct arrangement as shown in FIG. The reproduction can be performed normally in the same manner as described above.

As described above, discs recorded by the optical disc recording / reproducing apparatus of the present embodiment can be reproduced only in a limited number of apparatuses, so that unauthorized copying on recordable media can be prevented.

As described above, according to the optical disk recording / reproducing apparatus of the present embodiment, the SY added to the sector data
Recording can be performed by changing the pattern of the NC code. Further, the optical disk recorded by the optical disk recording / reproducing apparatus according to the present embodiment cannot be easily reproduced by the conventional reproducing apparatus, and therefore, illegal copying during recording can be prevented. In addition, the configuration can be simplified simply by adding only the SYNC conversion circuits 1001a and 1001b having the above functions to the conventional device.

As described above, in the first to fourth embodiments,
Although the effective means for preventing unauthorized copying in the optical disk recording / reproducing apparatus has been described, the present invention is not limited to the above-described embodiment, and the identification address, the error detection code, the error correction, The purpose of the present invention is to limit the devices that can be reproduced by converting the values and positions of constituent elements such as codes and additional codes such as synchronization signals into a form different from the original form and recording the same. Various modifications different from the above can be implemented. Further, in each of the embodiments described above, the means for preventing unauthorized copying is applied to the optical disc recording / reproducing apparatus. However, the present invention is not limited to the above-described embodiment, and various means may be used without departing from the gist of the invention. The present invention can be applied to an apparatus.

[0063]

As described above, according to the present invention, the contents or the position of the additional information of the data sector structure recorded on the optical disc are converted and recorded according to a specific rule, so that the conventional reproducing apparatus can normally operate. Since the reproduction cannot be performed and the reproduction can be performed only by the reproduction device having the reverse conversion function of the conversion, it is possible to prevent the occurrence of illegal copying or piracy at the time of recording on the disk.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disc recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a data sector 305 whose ID position has been changed by an ID position changing circuit 901b shown in FIG. 3;

FIG. 5 is a block diagram showing a configuration of an optical disc recording / reproducing device according to a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a track structure of a single layer of a disc.

FIG. 7 is a diagram showing a processing order (flow of an encoding process) for forming a physical sector.

FIG. 8 is a diagram showing a configuration of one data sector.

FIG. 9 is a diagram showing a configuration of one ECC block.

FIG. 10 is a diagram showing a configuration of a recording sector.

FIG. 11 is a diagram showing a configuration of one physical sector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Optical disk 102 Pickup 103 Spindle motor 104 Servo 105 Read channel 106 Decoder circuit 107a, 107b ID conversion circuit 108 ID detection circuit 109a, 109b RAM 110 Decoding processing part 111 Encoder 112 Modulation circuit 113 Encoding processing part 114 Laser driver 115 Interface 116 Microcomputer 201 Lead-in area 202 Data area 203 Lead-out area 401 ID 402 IED 403 CPR_MAI 404 EDC 405 Sector information 406 Sector number 407 Format type 408 Tracking method 409 Reflectivity 410 Reserved 411 Area type 412 Data type 413 Layer number 501 PI NPO PO Code 80 1a, 801b EDC conversion circuit 802 Demodulation circuit 901a, 901b ID position change circuit 1001a, 1001b SYNC conversion circuit 1002 SYNC detection circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) G11B 20/12 G11B 20/12 F term (reference) 5D044 BC06 CC04 DE03 DE32 DE38 DE68 GK17 GL01 GL02 5D066 DA02 DA11 5D090 AA01 BB04 CC01 CC04 CC14 DD03 GG21

Claims (13)

[Claims] 1. Data is divided into units of h (h: natural number) bytes, and an identification address, an error detection code, and an error correction code are added to form a sector.
In an optical disc recording / reproducing apparatus that divides data into units of (natural number) bytes, adds a synchronization signal to form a frame, and further records / reproduces a disk on which frame data is modulated and recorded, an identification address, an error detection code, Conversion means for changing the content or position of additional information such as an error correction code and a synchronization signal; and inverse conversion for changing the content or position of the additional information changed by the conversion means to the content or position of the additional information before change Means for recording on a disk data to which the additional information changed by the conversion means has been added, or reproducing the recorded data by changing the data by the inverse conversion means. 2. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address composed of sector information and a sector number, an error detection code, and an error correction code. In an optical disc recording / reproducing apparatus that divides data into units of i (i: natural number) bytes, adds a synchronization signal to form a frame, and records / reproduces a disk on which frame data is modulated and recorded, Converting means for converting the sector number including a number from a predetermined value to another value, and recording data added with an identification address having the sector number converted by the converting means on a disk. Optical disk recording and reproducing device. 3. The sector number value before conversion of an optical disk on which data is recorded in a sector configuration to which an identification address having a sector number converted by the conversion means is added. An optical disk recording / reproducing apparatus, comprising: an inverse conversion means for converting the data into an audio data; 4. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address composed of sector information and a sector number, an error detection code, and an error correction code to the data. This is used for an optical disk recording / reproducing apparatus that divides data into units of bytes, adds a synchronization signal to form a frame, and further records and reproduces a disk on which frame data is modulated and recorded. An identification address conversion circuit for converting the sector number including a sector number from a predetermined value to another value. 5. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address, an error detection code, and an error correction code to each sector.
An optical disc recording / reproducing apparatus which divides data into units of (natural number) bytes, adds a synchronization signal to form a frame, and further records / reproduces a disk on which frame data is modulated and recorded; An optical disk recording / reproducing apparatus having conversion means for converting a value from a predetermined value to another value, and recording, on a disk, data formed by adding an error detection code converted by the conversion means; . 6. The inverse conversion method according to claim 5, wherein the error detection code is converted into a value of the error detection code before conversion on an optical disk on which data to which the error detection code converted by the conversion unit is added is recorded. An optical disc recording / reproducing apparatus comprising a converting means, wherein the recording data is reproduced by converting the data by the inverse converting means. 7. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address composed of sector information and a sector number, an error detection code, and an error correction code, and i (i This is used for an optical disk recording / reproducing apparatus which divides data into units of bytes, adds a synchronization signal to form a frame, and further records and reproduces a disk on which frame data is modulated and recorded. An error detection code conversion circuit for converting a predetermined value of a detection code from a predetermined value to another value. 8. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address, an error detection code, and an error correction code added at the beginning of the sector, and forming the sector. In an optical disc recording / reproducing apparatus which divides data into units of i (i: natural number) bytes, adds a synchronization signal to form a frame, and records / reproduces a disk on which frame data is modulated and recorded, An optical disk recording / reproducing apparatus, comprising: converting means for changing the position of the identification address to another position in the sector, and recording data constituted by changing the position of the identification address by the changing means on the disk. 9. The reverse conversion means according to claim 8, wherein the position of the identification address is changed to the position before the change on the optical disk on which the data to which the identification address whose position has been changed by the conversion means is added. An optical disk recording / reproducing apparatus, characterized in that the recording / reproducing apparatus reproduces recorded data by changing the data by the inverse conversion means. 10. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address, an error detection code, and an error correction code to be added to a head position of the sector. It is used in an optical disk recording / reproducing apparatus that divides data into units of i (i: natural number) bytes, adds a synchronization signal to form a frame, and further records / reproduces a disk on which frame data is modulated and recorded. An identification address position changing circuit, which sometimes changes the position of the identification address to another position in the sector. 11. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address, an error detection code, and an error correction code to each sector.
(I: natural number) In an optical disc recording / reproducing apparatus which divides the data into byte units, adds a synchronization signal to form a frame, and records / reproduces a disk on which the frame data is modulated and recorded, An optical disk recording / reproducing apparatus, comprising: conversion means for converting the arrangement between the synchronization signals, and recording, on a disk, data obtained by converting the arrangement of the synchronization signals by the conversion means. 12. The inverse conversion unit according to claim 11, wherein the arrangement of the synchronization signal is changed to the arrangement before the change on the optical disk on which the data to which the synchronization signal whose arrangement has been changed by the conversion unit is added is recorded. An optical disk recording / reproducing apparatus, characterized in that the recording / reproducing apparatus reproduces recorded data by changing the data by the inverse conversion means. 13. A sector is formed by dividing data into units of h (h: natural number) bytes and adding an identification address, an error detection code, and an error correction code to each sector.
(I: natural number) This is used for an optical disk recording / reproducing apparatus which divides data into units of bytes, adds a synchronization signal to form a frame, and further records / reproduces a disk on which frame data is modulated and recorded. A synchronization signal conversion circuit for converting an arrangement between the synchronization signals in the sector.