JP3580041B2 - Signal recording method, signal transmission method and apparatus, and signal reception method and apparatus - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a signal recording method for recording a digital signal on a recording medium, a signal transmission method and device for transmitting a digital signal, and a signal reception method and device for receiving a transmitted digital signal.
[0002]
[Prior art]
Conventionally, when signals such as digital video signals, digital audio signals, and computer program data (hereinafter, simply referred to as digital signals) are recorded on a recording medium or transmitted to an information transmission medium, for example, An error detection code and an error correction code are added to these digital signals.
[0003]
For this reason, for example, when reproducing a recording medium on which the digital signal is recorded, the error detection processing using the error detection code and the error correction code are performed on the signal read from the recording medium. The digital signal is reproduced by performing an error correction process. Similarly, when a digital signal is received via a transmission medium, an error detection process using the error detection code and an error correction process using the error correction code are performed on the signal supplied via the transmission medium. By performing the above processing, the digital signal is received.
[0004]
[Problems to be solved by the invention]
In recent years, as a recording medium on which digital signals such as digital video signals and digital audio signals and computer program data are recorded, optical recording media, specifically, so-called compact discs (CDs) for music are used. ) And CD-ROMs using the CD standard disc as a read-only memory for data have become widespread throughout the world. Recently, a so-called digital video disc (DVD) has also been used as a next-generation recording medium. Standardization is in progress.
[0005]
Here, a signal recorded on a recording medium such as a CD, a CD-ROM, or a DVD as described above is read, and all of the digital signals are reproduced by performing the above-described error correction processing and the like. The digital signal copied to a recordable / reproducible recording medium and then copied to the hard disk or the like is supplied to an encoding system such as a CD, a CD-ROM, or a DVD, and a new another CD, CD-ROM, DVD, or the like is provided. , It is possible to produce a CD, CD-ROM, DVD, or the like in which a digital signal exactly the same as the original digital signal is copied.
[0006]
When new recording media are produced one after another in this way, it is not possible to distinguish whether the digital signal recorded on the recording medium is the original original digital signal or the digital signal copied illegally. Will be. Of course, this problem occurs not only in the disk-shaped recording medium such as the CD and the CD-ROM, but also in a tape-shaped recording medium and other recording media.
[0007]
Therefore, it is possible to specify whether the signal recorded on the recording medium is the original digital signal or the copied digital signal (that is, the history can be known), and further, regarding the recording medium on which the digital signal is illegally copied, It is hoped that it can be made unreproducible. The same applies to a signal transmitted via a transmission medium, and it is possible to specify whether the signal supplied via the transmission medium is an original digital signal or a copied digital signal. It is desirable to be able to prevent transmission.
[0008]
In a predetermined area of the recording medium, information indicating that the original digital signal is recorded on the recording medium or that the copied digital signal is recorded is recorded. Although this has been done in the past, there is still no method that can identify whether the digital signal itself is an original digital signal or a copied digital signal. Similarly, there is no method that can specify whether the digital signal itself via the transmission medium is an original digital signal or a copied digital signal.
[0009]
Accordingly, the present invention has been made in view of such circumstances, and can specify whether a signal recorded on a recording medium or transmitted to a transmission medium is an original digital signal or a copied digital signal. It is another object of the present invention to provide a signal recording method, a signal transmitting method and an apparatus, and a signal receiving method and an apparatus capable of making reproduction impossible or preventing transmission when an illegal copy is made.
[0010]
On the other hand, conventionally, when the digital signal is recorded on, for example, a recording medium or transmitted to an information transmission medium, another different information (hereinafter, simply referred to as digital information) is recorded or simultaneously with or accompanying the digital signal. In the case of transmission, in general, the area given to the digital signal and the area given to the digital information are often separated on a recording format or a transmission format.
[0011]
That is, when the digital signal and the digital information are simultaneously recorded, for example, on a recording medium, an area in which the digital signal is stored is separated from an area in which the digital information is stored. Similarly, when the digital signal and the digital information are transmitted simultaneously on a transmission medium, a region where the digital signal is transmitted (for example, a time region or a frequency region) is separated from a region where the digital information is transmitted. It has been made.
[0012]
Here, as described above, even if the storage area for the digital signal and the storage area for the digital information are separated, the digital signal and the digital information are both treated as the same digital data. Therefore, when these digital signals and digital information are actually recorded on a recording medium or transmitted to a transmission medium, processing such as adding a common error detection code and error correction code to these digital signals and digital information is performed. Is made. Therefore, when reproducing the digital signal and digital information recorded on the recording medium and receiving the digital signal and digital information transmitted on the transmission medium, the common error detection code and error correction code are used. , An error detection and error correction process is performed, thereby enabling the reproduction and reception of the digital signal and the digital information.
[0013]
By the way, in recent years, it has been desired to be able to record a large amount of data such as the digital video signal and the digital audio signal on one or a small number of recording media, and to transmit the data at high speed and in real time. That is, for example, when a digital signal having continuous contents such as a movie is divided and recorded on a large number of recording media, when watching the movie, it is necessary to exchange the plurality of recording media to reproduce the movie. Therefore, it is desired to record the digital signal on a small number (preferably one) of recording media. Similarly, in the case of transmitting these digital signals, for example, if the transmission speed of the digital signals is low, an unnatural moving image or sound may be interrupted, so that high-speed and real-time It is desired to be able to transmit.
[0014]
However, the recording capacity of the recording medium is limited, and the transmission capacity and transmission speed of the transmission medium are also limited. For this reason, recording or transmitting digital information simultaneously with a digital signal as described above is not desirable in terms of the recording capacity, transmission capacity, and transmission speed. However, if the digital information is particularly important information, it must be recorded or transmitted.
[0015]
Accordingly, the present invention has been made in view of such circumstances, and when recording and transmitting other digital information together with digital signals such as digital video signals and digital audio signals, the recording capacity, transmission capacity, and transmission speed Another object of the present invention is to provide a signal recording method, a signal transmitting method and a signal transmitting method, and a signal receiving method and a signal transmitting apparatus capable of recording or transmitting the digital information with less influence on the signal.
[0016]
[Means for Solving the Problems]
According to the signal recording method of the present invention, an error correction code is added to a predetermined area of a digital signal, a part of the predetermined area of the error correction code is replaced with specific information, and a part of the predetermined area is specified. The above-mentioned problem is solved by recording on a recording medium a digital signal to which an error correction code replaced with the above information is added.
[0018]
Further, the signal transmission method and apparatus of the present invention add an error correction code to a predetermined area to a digital signal, replace a part of the predetermined area of the error correction code with specific information, and The above-mentioned problem is solved by transmitting a digital signal to which an error correction code partially replaced with specific information is added.
[0019]
In addition, the signal receiving method and apparatus of the present invention receive a digital signal to which an error correction code in which a part of a predetermined area is replaced with specific information is added, and decode the error correction code before decoding the error correction code. The above-mentioned problem is solved by extracting and specific information.
[0020]
That is, according to the present invention, specific information can be recorded or transmitted together with the digital signal by replacing a part of the error correction code of the digital signal. By extracting, the specific information can be extracted. Therefore, if the specific information is information indicating either the original or the copy, the signal recorded on the recording medium or transmitted to the transmission medium is the original digital signal or the copied digital signal. Can be specified, and when an illegal copy is made, the reproduction can be disabled or the transmission can be prevented.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0022]
First, together with, for example, a digital video signal, a digital audio signal, or computer program data (hereinafter simply referred to as a digital signal), another different specific digital information (hereinafter, particularly referred to as identification information) is added to these digital signals. A method of recording the identification information together with the digital signal from the recording medium will be described.
[0023]
FIG. 1 shows an example of a data format of a sector which is one unit when the digital signal is recorded on a recording medium.
[0024]
That is, in FIG. 1, the above-mentioned sector includes two frames in the horizontal direction and 14 frames in the vertical direction, and is composed of 28 frames as a whole. Note that the frame shown in FIG. 1 is a unit into which a synchronization signal (sync) is inserted. In the example of FIG. 1, a 2-byte synchronization signal is arranged at the beginning, followed by an 85-byte data area. Are arranged to constitute the one frame.
[0025]
In the sector, the first 20 bytes of the data area are used as a header, and predetermined data (user data) is arranged in an area of 2 kbytes (2048 bytes) following the header. The user data is the digital video signal, digital audio signal, computer program data, or the like. In this sector, a 4-byte EDC (Error Detection Code), which is a code for detecting an error in the 2 k-byte user data, is arranged.
[0026]
Further, among the sectors, an 8-bit parity C1 and a 14-bit parity C2 are arranged at the right ends of two frames arranged in the horizontal direction in the drawing. These are error correction codes, each of which is set for 170 bytes of data of two frames. The C1 sequence is set for two frames of data in the horizontal direction (horizontal direction) in the figure. On the other hand, the C2 sequence is encoded in a form interleaved with the C1 sequence. That is, the C2 sequence is set for 170-byte data from the upper left to the lower right (in a diagonal direction) of the drawing.
[0027]
Here, in the embodiment of the present invention, the identification information is added to the digital signal by replacing a part of the parity of the sector. However, when a part of the parity is replaced, the replacement is performed within the range of the error correction capability by the parity so as not to affect the data reproduction regardless of the presence / absence of the identification information. More specifically, identification information for a total of 14 bytes, ie, 1 byte per sequence (per frame) of the parity C2, is added to one sector. That is, since the parity C2 normally has a correction capability of 7 bytes per line, even if the identification information of 1 byte per line is added as described above, no problem occurs in normal reproduction. .
[0028]
On the other hand, when reproducing the recording medium on which the sector data in which the identification information is added to the parity is recorded as described above, at the same time as performing the error correction processing using the parity and extracting the user data, The added identification information is also extracted.
[0029]
For this reason, in the embodiment of the present invention, the identification information can be recorded together with the digital signal without increasing the total recording information amount of the recording medium, and the identification information can be reproduced. Has become.
[0030]
If a plurality of sectors to which the above-described identification information is added are prepared (that is, the redundancy is increased) and the recording medium is repeatedly recorded or dispersedly recorded, for example, the identification information due to a defect of the recording medium or the like can be obtained. Can be prevented from being lost. Here, when the recording medium is, for example, a disk-shaped recording medium, a plurality of sectors to which the identification information is added as described above are recorded on, for example, a track for one round, or the inner and outer tracks are recorded. Or can be recorded separately. When the disc-shaped recording medium has two or more recording layers, a plurality of sectors to which the identification information has been added can be recorded separately for each recording layer. Further, as a measure for preventing the loss of the identification information, an error correction code can be added to the identification information itself. When the error correction code is added to the identification information in this way, when the number of bytes given for the identification information is, for example, the 14 bytes, for example, 10 bytes are allocated to the identification information itself, and the remaining bytes are assigned. Four bytes can be assigned to the error correction code. Further, it is also possible to add an error correction code to the identification information itself and disperse and record it on a disk-shaped recording medium. In this case, for example, when it is assumed that 10 sectors can be recorded for one round of the track, for example, of the 140 bytes allocated to each identification information of the 10 sectors, for example, 100 bytes are allocated to the identification information, and the remaining 40 bytes are allocated to the identification information. It is possible to allocate bytes for the error correction code. Since the sector to which the identification information is added has a lower error correction capability than the case where the identification information is not added, the user data area of the sector to which the identification information is added should not contain useful information. It is also possible to reduce the impact on data security. Examples of the identification information include copy history information of a medium, transmission history information of transmission contents, and encryption key information, which will be described later.
[0031]
Next, FIG. 2 shows a signal recording apparatus according to a first specific example of the present invention, in which the above-described identification information can be added to a digital signal and recorded on a recording medium by replacing a part of the parity as described above. The configuration is shown.
[0032]
In FIG. 2, a digital signal such as the digital audio signal, digital video signal, or computer data is supplied to an input terminal 11. In addition, the terminal 10 is supplied with the specific digital information recorded on the recording medium in addition to the digital signal, that is, the identification information. The digital signal is sent to the sectoring circuit 13 via the interface circuit 12, and the identification information is sent to the identification information replacing circuit 23 described later via the interface circuit 12.
[0033]
The sectoring circuit 13 divides the digital signal into units of a predetermined data amount, for example, a unit of 2048 bytes as shown in FIG. 1, and stores sector data obtained by the sectorization and a sector address corresponding to the sector. Is output.
[0034]
The sector data and the sector address are sent to the scramble processing circuit 14. The scramble processing circuit 14 performs scramble processing on the sector data using the sector address. In the scramble processing circuit 14, as the scramble processing using the sector address, the input data is randomized so that the same byte pattern does not appear continuously, that is, the same pattern is removed, and the signal is appropriately processed. Randomization processing is performed to enable reading and writing. The configuration and operation of the scramble processing circuit 14 will be described later.
[0035]
The data scrambled (or randomized) by the scramble processing circuit 14 and the sector address are sent to the header addition circuit 15. The header adding circuit 15 arranges header data including information such as the sector address at the head of each sector and adds the EDC, which is an error detection code. The output data of the header adding circuit 15 is sent to the error correction coding circuit 16.
[0036]
The error correction coding circuit 16 performs data delay and parity calculation on the data in sector units, and adds parity C1 and C2 error correction codes. The output data of the error correction encoding circuit 16 is sent to the identification information replacing circuit 23. The identification information is also supplied from the interface circuit 12 to the identification information replacement circuit 23 as described above.
[0037]
The identification information replacement circuit 23 replaces a part of the parity C2 of the sector supplied from the error correction encoding circuit 16 with the identification information as described above with reference to FIG.
[0038]
The modulation circuit 17 at the next stage modulates the output data of the identification information replacement circuit 23 according to a predetermined modulation method. That is, for example, a modulation process is performed to convert the 8-bit data supplied from the identification information replacing circuit 23 into 16-channel bit modulation data. The modulation data output from the modulation circuit 17 is sent to the synchronization adding circuit 18.
[0039]
The synchronization adding circuit 18 adds a synchronizing signal having a so-called out-of-rule pattern that breaks the modulation rule of the predetermined modulation method in the modulation circuit 17 to the modulation data in a predetermined data amount unit. send.
[0040]
The driver 19 amplifies the output of the synchronization adding circuit 18 to a predetermined level, and sends the amplified signal to the recording head 20.
[0041]
The recording head 20 performs, for example, optical or magneto-optical recording using a laser beam. At the time of the recording, the recording head 20 emits a laser beam in accordance with the modulated recording signal from the driver 19 and a spindle motor 22. For example, by irradiating the laser beam onto the disk-shaped recording medium 21 which is driven to rotate at a constant linear velocity, pits corresponding to the recording signal are formed.
[0042]
As described above, in the signal recording apparatus according to the first embodiment of the present invention, the total amount of recorded information on the disk-shaped recording medium 21 is increased, and the recording speed is not affected, and the digital signal and the digital signal are combined. It is possible to record identification information.
[0043]
In the example shown in FIG. 2, the scramble processing circuit 14 is provided at a stage preceding the header adding circuit, but may be inserted at a stage following the header adding circuit 15. When the scramble processing circuit 14 is provided in the subsequent stage of the header addition circuit 15, the digital signal to which the header has been added by the scramble processing circuit 14 is subjected to the same scramble processing as described above, and then the data is processed. This is sent to the error correction coding circuit 16. In the configuration example of FIG. 2 described above, for example, if the output of the identification information replacing circuit 23 is stored in a memory or the like and repeatedly read and sent to the modulation circuit 17, as described above, the identification information Can be recorded on the disk-shaped recording medium 21. Further, in the configuration of FIG. 2, it is also possible to add an error correction code to the identification information as described above. In this case, for example, the identification information output from the interface circuit 12 is sent to the error correction encoding circuit 16, and the error correction encoding circuit 16 adds an error correction code to the identification information. Is sent to the identification information replacing circuit 23 together with the sector data to which the error correction code is added. At this time, the identification information replacement circuit 23 replaces a part of the parity C2 of the sector data with the identification information to which the error correction code is added.
[0044]
The sector to which the identification information has been added can also be recorded in, for example, an area inaccessible to the user, for example, a track represented as a negative address that cannot be reproduced by a normal reproducing apparatus. This makes it possible to increase the confidentiality of the identification information against tampering.
[0045]
Next, FIG. 3 shows a configuration of a signal reproducing apparatus according to a second specific example of the present invention for reproducing data from the disc-shaped recording medium 21 recorded by the signal recording apparatus according to the first specific example. Show.
[0046]
In FIG. 3, the disk-shaped recording medium 21 is driven to rotate by a spindle motor 111, and the recorded contents are read from the digital-shaped recording medium 21 by a reproducing head 112 such as an optical pickup.
[0047]
The signal read by the reproduction head 112 is converted into binary digital data by a binarization circuit 113 and sent to a sync separation circuit 114. In the synchronization separation circuit 114, the synchronization signal added by the synchronization addition circuit 18 in FIG. 2 is separated. The digital data output from the sync separation circuit 114 is sent to a demodulation circuit 115, where demodulation processing corresponding to the modulation processing in the modulation circuit 17 in FIG. 2 is performed. This demodulation processing is specifically processing for converting 16 channel bits to 8-bit data. The digital data from the demodulation circuit 115 is sent to an error correction decoding circuit 116 and an identification information extraction circuit 130 described later.
[0048]
The error correction decoding circuit 116 performs a decoding process as a reverse process of the coding in the error correction coding circuit 16 in FIG. That is, the error correction decoding circuit 116 performs a process of correcting an error caused by a defect of the disc-shaped recording medium 21 or a reading error of the reproducing head 112.
[0049]
Here, the data supplied to the error correction decoding circuit 116 includes the identification information in the parity C2 as shown in FIG. However, by performing the error correction decoding process in the error correction decoding circuit 116, the identification information is lost. Therefore, the output data from the error correction decoding circuit 116 includes the upper identification information. Will not be.
[0050]
The output data of the error correction decoding circuit 116 is decomposed into sectors by a sector decomposing circuit 117, and a header at the head of each sector is separated by a header decomposing circuit 118. These sector decomposition circuit 117 and header decomposition circuit 118 correspond to the sectorization circuit 13 and header addition circuit 15 of FIG.
[0051]
The output data of the header disassembling circuit 118 is sent to the descrambling processing circuit 119. The descrambling circuit 119 performs a descrambling process on the output data of the header decomposing circuit 118 as a reverse process of the scrambling process in the scramble processing circuit 14 of FIG. The output data of the descramble processing circuit 14 is output from the terminal 121 via the interface circuit 120 as the digital signal.
[0052]
On the other hand, the identification information extraction circuit 130 extracts the identification information from the output data of the demodulation circuit 115 (data before decoding processing for error correction). That is, the identification information extracting circuit 130 extracts the identification information recorded on the disk-shaped recording medium 21 while being added to the parity of the sector.
[0053]
The extracted identification information is sent to the interface 120 and output from the terminal 122 via the interface 120.
[0054]
Thus, in the signal reproducing apparatus according to the second embodiment of the present invention, the digital signal can be reproduced from the disk-shaped recording medium 21 on which the sector data as shown in FIG. Can also be played.
[0055]
As described above, when a plurality of sectors to which the identification information has been added are recorded on the disk-shaped recording medium 21, only one of the sectors is identified by the signal reproducing apparatus of FIG. , It is possible to prevent loss of identification information due to a defect of the recording medium or the like. Further, as described above, when an error correction code is added to the identification information itself, the identification information extraction circuit 130 converts the identification information to which the error correction code has been added from the output data of the demodulation circuit 115. The identification information extracted and added with the error correction code is sent to, for example, the error correction decoding circuit 116. At this time, the error correction decoding circuit 116 performs an error correction process on the identification information to which the error correction code is added simultaneously with the error correction process on the output data from the demodulation circuit 115. The identification information obtained by the processing in the error correction decoding circuit 116 is sent to the interface circuit 120. Further, when the sector to which the identification information is added is recorded as a region inaccessible by the user, for example, on a track or the like represented as the negative address, the signal reproducing apparatus of FIG. Can also be reproduced.
[0056]
By the way, the signal recording device of FIG. 2 and the signal reproducing device of FIG. 3 have a one-to-one correspondence, and the signal recording device of FIG. The identification information is recorded with the identification information added thereto, while the signal reproducing apparatus shown in FIG. 3 also extracts the identification information when reproducing the digital signal from the disk-shaped recording medium 21.
[0057]
However, when the disc-shaped recording medium 21 is reproduced by a normal signal reproducing device that does not include the identification information extracting circuit 130 like the signal reproducing device of the second specific example of the present invention shown in FIG. On the other hand, the data output from the error correction decoding circuit of the ordinary signal reproducing apparatus does not include the identification information, so that only the digital signal is output from the interface circuit. Therefore, for example, a digital signal obtained by reproducing the disc-shaped recording medium 21 by a normal signal reproducing device not provided with the identification information extracting circuit 130 is used, for example, in the first concrete example of the present invention shown in FIG. If a normal signal recording device which does not include the identification information replacing circuit 23 as in the signal recording device of FIG. 1 is copied to another disk-shaped recording medium, a digital signal without the identification information is added to the disk-shaped recording medium. Only the signal will be recorded.
[0058]
For this reason, if it is detected whether or not the identification information has been added to the digital signal reproduced from the disc-shaped recording medium, the digital signal recorded on the disc-shaped recording medium will Whether or not the signal has been recorded by the signal recording device of the first specific example of the present invention, and the disc-shaped recording medium recorded by the signal recording device of the first specific example of the present invention can be reproduced by the above-mentioned ordinary signal reproducing device. It is possible to determine whether or not the digital signal reproduced and reproduced by the ordinary signal reproducing device is further copied by the ordinary signal recording device. Further, if it becomes possible to determine the digital signal recorded on the disc-shaped recording medium in this way, for example, only the disc-shaped recording medium recorded by the signal recording device of the first specific example of the present invention can be reproduced. Conversely, it is also possible to make it impossible to reproduce the disc-shaped recording medium recorded by the ordinary signal recording device.
[0059]
The identification information recorded on the disc-shaped recording medium by the signal recording device of the first specific example of the present invention is, for example, information indicating that the digital signal is an original signal or a copied signal. If the recording history information such as information indicating that the disc-shaped recording medium is used, by detecting the content of the history information added to the digital signal reproduced from the disc-shaped recording medium, the disc-shaped recording It is possible to specify whether the digital signal recorded on the medium is the original signal or the copied signal, and it is also possible to specify how many times the signal is copied. If it is possible to specify whether the digital signal recorded on the disc-shaped recording medium is the original signal or the copied signal, for example, only the original signal can be reproduced, or the copied signal can be reproduced. It is possible to make it impossible or to limit the number of times of copying.
[0060]
Hereinafter, data is read from the disk-shaped recording medium 21, and information is extracted from the parity C2 included in the read data from the position where the identification information is added as shown in FIG. Based on the extracted information, it is specified whether the data read from the disc-shaped recording medium 21 is an original digital signal or a copied signal. For example, when the data is an original signal, reproduction is performed. Conversely, a signal reproducing apparatus according to a third specific example for preventing reproduction when the signal is not the original signal, that is, when the signal is a copied signal, will be described with reference to FIG. In the configuration of FIG. 4, components that perform the same operations as in FIG. 3 are denoted by the same reference numerals as those in FIG. 4, and detailed description of the operations is omitted.
[0061]
In FIG. 4, when the disc-shaped recording medium 21 is recorded by the signal recording device of the first specific example of the present invention shown in FIG. The identification information is added to the read data. However, the identification information at this time is information indicating that when the digital signal is an original signal, and is information indicating that when the digital signal is a copied signal. On the other hand, when the disc-shaped recording medium 21 is not recorded by the signal recording device of the first specific example of the present invention, that is, recorded by the ordinary signal recording device. In this case, the disc-shaped recording medium recorded by the signal recording device according to the first embodiment of the present invention is reproduced by the normal signal reproducing device, and the digital signal reproduced by the normal signal reproducing device is further processed by the normal signal reproducing device. If the data is copied by a normal signal recording device, the identification information is not added to the digital signal read from the disk-shaped recording medium 21.
[0062]
The identification information extraction circuit 130 of the signal reproducing apparatus according to the third specific example shown in FIG. 4 includes the identification information as shown in FIG. 1 among the parities C2 included in the output data of the demodulation circuit 115. The information is extracted from the position where is added, and the extracted information is sent to the comparison circuit 133. When the identification information extraction circuit 130 cannot extract information from the position of the parity C2 to which the identification information is added, for example, it outputs information indicating that or outputs no information. You can also
[0063]
Further, the comparison circuit 133 is also supplied with the reference identification information from the reference identification information extraction circuit 131. This reference identification information is prepared in advance in the ROM 132, and has the same content as the identification information added to the original digital signal, for example. That is, the reference identification information extraction circuit 131 performs read control of the ROM 132 and sends the reference identification information read from the ROM 132 to the comparison circuit 133.
[0064]
The comparison circuit 133 compares the output information from the identification information extraction circuit 130 with the reference identification information from the reference identification information extraction circuit 131, and sends the comparison result to the CPU 134.
[0065]
The CPU 134 determines whether or not the comparison result between the output information of the identification information extraction circuit 130 and the reference identification information from the reference identification information extraction circuit 131 is the same. Controls the interface circuit 120 to prevent the reproduction information (digital signal) from being output to the outside, and to output the reproduction information (digital signal) to the outside if they match. That is, the fact that the output information of the identification information extraction circuit 130 does not match the reference identification information means that the digital signal recorded on the disk-shaped recording medium 21 is, for example, the present invention shown in FIG. Means a signal copied by the signal recording device of the first specific example, or a signal recorded or copied by the ordinary signal recording device instead of the signal recording device of the first specific example of the present invention. ing. Therefore, in the signal reproducing apparatus of the third specific example, as described above, when the comparison results do not match, the CPU 134 stops the output from the interface circuit 120, thereby reproducing the digital signal. I try to prevent that. On the other hand, the fact that the output information of the identification information extraction circuit 130 matches the reference identification information means that the digital signal recorded on the disk-shaped recording medium 21 is an original signal. . Therefore, in the signal reproducing apparatus, when the comparison results match, the CPU 134 causes the interface circuit 120 to output a digital signal.
[0066]
By performing the above, according to the signal recording device and the signal reproducing device of the present invention, it is possible to reproduce only the disc-shaped recording medium on which the original digital signal is recorded. It is possible to prevent the disk-shaped recording medium on which the signal is recorded from being reproduced and to prevent the illegally copied digital signal from being further copied.
[0067]
In the above-described example, an example has been described in which only the disc-shaped recording medium to which the identification information indicating the original digital signal is added can be reproduced. However, when the identification information is the recording history information as described above, For example, it is also possible to copy only once and to prohibit the second and subsequent copies. When the first copy is performed as described above, the content of the identification information added to the digital signal in the signal recording apparatus of the first specific example of the present invention shown in FIG. Is replaced with information indicating the first copy. Further, in the signal reproducing apparatus according to the third specific example of the present invention for reproducing the disk-shaped recording medium 21 on which the identification information indicating the first copy is recorded, the reference identification information prepared in the ROM 132 is The CPU 134 corresponds to the identification information indicating the original signal and the identification information indicating the first copy, and the CPU 134 sets the interface only when the comparison result between the identification information and the reference identification information matches. The circuit 120 is controlled to output a digital signal. When the first copy is performed, the content of the identification information added to the digital signal in the signal recording device of the first specific example of the present invention shown in FIG. Instead of the signal shown, the signal is changed to the one indicating the first copy. To realize this, the identification information is reproduced in the signal reproducing apparatus of FIG. 4 for reproducing the original signal. It is necessary to output the identification information extracted by the extraction circuit 130 to the outside via the interface circuit 120 as in the signal reproducing apparatus of FIG. 3 and to send the identification information to the signal recording apparatus of FIG. In this way, the signal recording device of FIG. 2 to which the identification information indicating the original signal is supplied from the signal reproducing device indicates that the identification information indicating the original signal is the first copy. The identification information is changed and added to the digital signal by the identification information replacement circuit 23. As described above, in the signal recording apparatus shown in FIG. 2, the portion for changing the identification information may be either the interface circuit 12 or the identification information replacement circuit 23. As described above, if the record history information is used as the identification information, the number of copies can be set to an arbitrary number, not limited to one, and the number of copies can be made. It is also possible to know the history.
[0068]
In the above-described signal reproducing apparatus according to the third specific example of the present invention, the reference identification information is set in the ROM 132 inside the apparatus. However, the reference identification information is provided for each disk-shaped recording medium. Can be If the reference identification information for proving authenticity (originality) is changed for each disk-shaped recording medium in this manner, the security against the falsification of the identification information can be improved.
[0069]
As an area for recording such reference identification information, for example, a TOC (table of contents) area of a disk-shaped recording medium as shown in FIG. 5 can be mentioned.
[0070]
In FIG. 5, the disc-shaped recording medium 21 has a center hole 102 at the center, and the TOC (table of contents), which is a program management area, extends from the inner periphery to the outer periphery of the disc-shaped recording medium 101. A lead-in area 103 serving as an area, a program area 104 in which program data is recorded, and a program end area, a so-called lead-out area 105, are formed. In the optical disk for reproducing audio signals and video signals, audio and video data are recorded in the program area 104, and time information of the audio and video data is managed in the lead-in area 103. That is, in the disc-shaped recording medium 21 shown in FIG. 5, the reference identification information can be recorded in the lead-in area 103 serving as the TOC area.
[0071]
When the reference identification information is recorded in the TOC area of the disc-shaped recording medium 21 as described above, the signal recording device of the present invention has a configuration like the signal recording device of the fourth specific example shown in FIG. In FIG. 6, the same reference numerals as those in FIG. 2 denote constituent elements that operate in the same manner as in FIG. 2, and a detailed description of their operations will be omitted.
[0072]
In the signal recording device of the fourth specific example shown in FIG. 6, the interface circuit 24 sends the identification information supplied to the terminal 10 to the identification information replacement circuit 23, and uses the identification information as the TOC as the reference identification information. It is also sent to the data generation circuit 25. The TOC data generation circuit 25 adds the reference identification information to the data to be recorded in the TOC area and outputs the data. The data output from the TOC data generation circuit 25 is sent to the driver 19 and is recorded in the TOC area of the disk-shaped recording medium 21 via the recording head 20.
[0073]
On the other hand, as described above, the signal reproducing device in the case where the reference identification information is recorded in the TOC area of the disc-shaped recording medium 21 has a configuration like the fifth specific example shown in FIG. In FIG. 7, the same reference numerals as those in FIG. 4 denote the same components as those in FIG. 4, and a detailed description of the operations will be omitted.
[0074]
In the signal reproducing apparatus of the fifth specific example shown in FIG. 7, the digital data read from the TOC area and binarized by the binarization circuit 113 is sent to the reference identification information extraction circuit 135. The reference identification information extraction circuit 135 extracts the reference identification information from the digital data of the binarization circuit 113 and sends the same to the comparison circuit 133. This allows the comparison circuit 133 to compare the information extracted by the identification information extraction circuit 130 with the reference identification information. The subsequent operation is the same as in FIG.
[0075]
As described above, when the reference identification information is recorded on the disc-shaped recording medium 21, the storage location information indicating the position where the reference identification information is recorded is recorded on the recording medium 21. It is also possible. That is, the storage location information in this case indicates the position on the recording medium 21 where the reference identification information is recorded, for example, in sector units. The recording position of the storage location information can be, for example, the TOC area or another predetermined position. For example, when the storage location information is recorded in the TOC area, the TOC information is stored in the lead-in area 103 of the recording medium 21. Record as part of The storage location information can be recorded in a location other than the recording medium 21. When the storage location information is recorded as described above, the storage location information is first read at the time of signal reproduction, and the reference identification information is extracted based on the read storage location information. Therefore, in order to retrieve the reference identification information, the storage location information must be read first, and as a result, it is possible to improve the security against falsification of the reference identification information.
[0076]
Further, the reference identification information is recorded, for example, in a normal sector on the recording medium 21, that is, in a sector of the program area 104, or on the recording medium 21, in addition to the case of recording in the TOC area as described above. It is also possible to record in a recording format such as a bar code, track wobbling, ultraviolet light, or the like. It is also possible to store the reference identification information in a location other than the recording medium 21. For example, in a signal reproducing apparatus, for example, an EEPROM normally provided for storing a device-specific serial number, an ID number, and the like. Or an IC card connected to or incorporated in the signal reproducing device or an information storage device such as a so-called PCMCIA (Personal Computer Memory Card International Association), or a modem / LAN via a communication interface. It may be supplied from a communication device or supplied from an external device by remote control receiving means from a keyboard or a remote control transmitting device. By doing so, it is possible to improve the security against falsification of the reference identification information.
[0077]
In FIG. 7, the identification information extracted by the identification information extraction circuit 130 can be sent to the descrambling processing circuit 119. That is, when the data recorded on the recording medium 21 is scrambled by the identification information, the descrambling process is performed using the identification information. The specific configuration and operation of the scramble process using the identification information and the corresponding descrambling process will be described later.
[0078]
Next, the configuration and operation of the scramble processing circuit 14 provided in the signal recording device of the first specific example of the present invention shown in FIG. 2 and the fourth specific example of the present invention shown in FIG. 6 will be described. I do. This scrambling process is a process that is usually performed.
[0079]
As the scramble processing circuit 14 used in the signal recording apparatus shown in FIGS. 2 and 6, for example, as shown in FIG. 8, a so-called parallel block synchronous type scrambler using a 15-bit shift register is used. Can be. To the data input terminal 35 of the scrambler, data from the sectoring circuit 13 is input in an order in which LSB (least significant bit) comes earlier in time, that is, in a so-called LSB first order. The 15-bit scramble shift register 41 sequentially shifts the bits of each register based on the bit clock from the terminal 34, and uses an exclusive OR (ExOR) circuit 42 to generate a generator polynomial x ^Fifteen Feedback according to + x + 1 is applied, and a preset value (or an initial value) selected from a table as shown in FIG. 9 is set in the 15-bit shift register 41.
[0080]
The selection number in the preset value table in FIG. 9 corresponds to, for example, the value of the lower 4 bits of the sector address. Therefore, the preset value can be switched in sector units by the lower 4 bits of the sector address. I have. That is, in the configuration of FIG. 8, the sector address is supplied from the sectoring circuit 13 to the terminal 30 of the scramble processing circuit 14, and this sector address is sent to the subsequent header adding circuit 15 via the terminal 31 and , To the sector address detection circuit 32. The sector address detection circuit 32 detects the lower 4 bits of the sector address and supplies the 4 bits to the register 33. Specifically, the register 22 is a table in which the preset values shown in FIG. 9 are stored, and 4 bits supplied from the sector address detection circuit 32 store any preset value from the preset value table. It is supplied as a selection signal for selection. A 16-bit preset value extracted from the register 33 corresponding to the 4 bits from the sector address detection circuit 32 is sent to the shift register 41.
[0081]
The output data from the shift register 41 and the input data from the terminal 35 are subjected to an exclusive OR operation by an exclusive OR circuit 43, taken out from a terminal 44, and taken out from the terminal 44. 15
[0082]
Here, in the above description of the signal reproducing devices according to the third and fifth specific examples of the present invention, the CPU 134 in these devices controls the output of the digital signal in the interface circuit 120, for example, the original digital signal. In this example, only the disk-shaped recording medium 21 on which the digital signal has been recorded can be reproduced, and the disc-shaped recording medium 21 on which the copied digital signal has been recorded cannot be reproduced. Alternatively, it is also possible to realize that the reproduction of the copied digital signal as described above is disabled by changing the preset value (initial value) according to the identification information.
[0083]
That is, if the scrambling processing circuit of the signal recording apparatus of the present invention changes the scrambling processing parameter based on the identification information to encrypt the output data of the sectorizing circuit 13, the signal reproducing apparatus When the identification information cannot be extracted, the encryption cannot be decrypted, so that the digital signal cannot be reproduced.
[0084]
As described above, the configuration for changing the parameters of the scrambling process based on the identification information is as in the signal recording device of the sixth specific example shown in FIG. In FIG. 10, the same components as those in FIG. 2 operate in the same manner as those in FIG. 2, and the detailed description of the operations is omitted.
[0085]
In FIG. 10, the identification information output from the interface circuit 12 is sent to the identification information replacement circuit 23 and also to the scramble processing circuit 26. The scramble processing circuit 26 changes the parameters of the scramble processing, that is, the generator polynomial or the preset value (initial value) based on the identification information, and performs encryption processing on the output data of the sectorization circuit 13. A specific configuration for changing the parameters of the scrambling process based on the identification information will be described later.
[0086]
On the other hand, the configuration for reproducing the disk-shaped recording medium 21 on which the data subjected to the encryption processing by the scramble processing circuit 26 as described above is recorded is the same as that of the signal reproducing apparatus of the seventh specific example shown in FIG. It becomes such a configuration. In FIG. 11, the same reference numerals as those in FIG. 3 denote constituent elements that operate in the same manner as in FIG. 3, and a detailed description of their operations will be omitted.
[0087]
In FIG. 11, the identification information extracted from the output data of the demodulation circuit 115 by the identification information extraction circuit 130 is sent to a descramble processing circuit 122. In the descrambling circuit 122, the encrypted data output from the header disassembling circuit 118 is subjected to a descrambling process as a reverse process of the scrambling process in the scramble processing circuit 26 in FIG. Thus, the encryption performed by the scramble processing circuit 26 of the signal recording device of FIG. 10 is decrypted. The output data of the descramble processing circuit 122 is output from the terminal 121 as the digital signal via the interface circuit 120 as described above.
[0088]
Next, a specific configuration and operation of the scramble processing circuit 26 of the signal recording device of FIG. 10 will be described.
[0089]
FIG. 12 shows a configuration of a first modified example of the scramble processing circuit 26. In FIG. 12, the same reference numerals as those in FIG. 8 denote the same components that operate in the same manner as in FIG. 8, and a detailed description of the operations will be omitted.
[0090]
The scramble processing circuit 26 of the first modification shown in FIG. 12 changes the preset value (initial value) of the parameters of the scramble processing in accordance with the identification information. By performing a logical operation on the four bits from the address detection circuit 32 based on the identification information, the preset value selected from the register 33 is changed.
[0091]
In FIG. 12, terminal 50 is supplied with identification information from the interface circuit 12. This identification information is supplied to the identification information detection circuit 51. The identification information detection circuit 51 takes out 4 bits of the identification information, for example, when the identification information is composed of 4 bits or more, the lower 4 bits, for example. The four bits extracted from the identification information are sent to the logical operation circuit 52. The logical operation circuit 52 is also supplied with 4 bits from the sector address detection circuit 32. The logical operation circuit 52 performs a logical operation using the four bits from the identification information detection circuit 51 on the four bits from the sector address detection circuit 32, and divides the four bits obtained by this operation into the register 33.
[0092]
That is, in the scramble processing circuit 26 of the first modified example shown in FIG. 12, the four bits from the sector address detection circuit 32 used when selecting a preset value from the preset value table of the register 33 are identified by the identification. By performing a logical operation on the four bits of the information, the preset value selected from the preset value table is changed. Thereby, in the scramble processing circuit 26 of the first modified example shown in FIG. 12, it becomes possible to change the parameters of the scramble processing according to the identification information. As the logical operation in the logical operation circuit 52, an exclusive OR (ExOR), a logical product (AND), a logical OR (OR), a shift operation, or the like can be used.
[0093]
Next, FIG. 13 shows a configuration of a second modified example of the scramble processing circuit 26. In FIG. 13, the same components as those in FIG. 12 operate in the same manner as those in FIG. 12, and the detailed description of the operations is omitted.
[0094]
The scramble processing circuit 26 according to the second modification shown in FIG. 13 changes the preset value of the parameters of the scramble processing according to the identification information. The preset value is changed by performing a logical operation on the 16-bit preset value using 16-bit identification information.
[0095]
In FIG. 13, identification information composed of 16 bits per word is supplied to the terminal 50 from the interface circuit 12. This identification information is supplied to the identification information detection circuit 53. The identification information detection circuit 53 supplies 16 bits of the identification information to the logical operation circuit 54. The logical operation circuit 54 is also supplied with a preset value selected by the 4 bits of the sector address detection circuit 32 from the preset value table of the register 33. The logical operation circuit 54 performs a logical operation using the 16 bits supplied from the identification information detection circuit 53 on the 16-bit preset value supplied from the register 33, and obtains 16 bits obtained by this operation. The bit is output as a preset value to the shift register 41.
[0096]
That is, in the scramble processing circuit 26 of the second modification shown in FIG. 13, the preset selected from the register 33 by the 4 bits of the sector address detection circuit 32 is logically operated by 16 bits of the identification information. To change the preset value. Thereby, in the scramble processing circuit 26 of the second modification shown in FIG. 13, it is possible to change the parameters of the scramble processing according to the identification information. As the logical operation in the logical operation circuit 54, an exclusive OR, a logical product, a logical sum, a shift operation, or the like can be used.
[0097]
Next, FIG. 14 shows a configuration of a third modification of the scramble processing circuit 26. In FIG. 14, the same reference numerals as those in FIG. 13 denote the components operating in the same manner as in FIG. 13, and a detailed description of their operations will be omitted.
[0098]
The scramble processing circuit 26 of the third modification shown in FIG. 14 changes the preset value among the parameters of the scramble processing according to the identification information. The preset value table itself in which 16 words of 16-bit preset values of one word shown in FIG. 9 are collected is logically operated using identification information of 16 words and 16 words. I try to make it.
[0099]
In FIG. 14, the terminal 50 is supplied with identification information consisting of 16 bits per word and 16 bits from the interface circuit 12. This identification information is supplied to the identification information detection circuit 55. The identification information detection circuit 55 supplies 16 words of the identification information to the logical operation circuit 56. The logical operation circuit 56 is also supplied with a preset value for 16 words constituting the preset value table of the register 57. The logical operation circuit 56 performs a logical operation on the 16-word preset value supplied from the register 57 using the 16-word identification information supplied from the identification information detection circuit 55, and obtains the result by this operation. The data for 16 words obtained is stored in the register 57 again. From this register 57, a preset value selected from the re-stored preset value table is output based on the 4 bits of the sector address detection circuit 32, and sent to the shift register 41.
[0100]
That is, in the scramble processing circuit 26 of the third modification shown in FIG. 14, the preset value table stored in the register 57 is logically operated by the identification information, thereby changing the preset value table itself. I am trying to do it. Thereby, in the scramble processing circuit 26 of the third modification shown in FIG. 14, it is possible to change the parameters of the scramble processing according to the identification information. As the logical operation in the logical operation circuit 56, an exclusive OR, a logical product, a logical sum, a shift operation, or the like can be used.
[0101]
Next, FIG. 15 shows a configuration of a fourth modified example of the scramble processing circuit 26. In FIG. 15, the same reference numerals as those in FIG. 12 denote the components operating in the same manner as in FIG. 12, and a detailed description of their operations will be omitted.
[0102]
The scramble processing circuit 26 of the fourth modified example shown in FIG. 15 changes the generator polynomial among the parameters of the scramble processing according to the identification information. Specifically, based on the identification information, By selecting each selected terminal of the changeover switch 46, the generator polynomial is changed.
[0103]
That is, in the scramble processing circuit 26 of the fourth modification shown in FIG. 15, the terminal 50 is supplied with the identification information from the interface circuit 12. This identification information is supplied to the identification information detection circuit 58. The identification information detection circuit 58 extracts the lower 4 bits, for example, when the identification information is composed of 4 bits of the identification information and 4 bits or more. The four bits extracted from the identification information are output as a changeover control signal for the changeover switch 46. Each selected terminal of the changeover switch 46 is supplied with each bit output of the 15-bit shift register 41. The changeover switch 46 is supplied with four bits from the identification information detection circuit 58 as a changeover control signal, and the output of the selected terminal selected according to the changeover control signal is sent to the exclusive OR circuit 42. .
[0104]
As described above, in the scramble processing circuit 26 of the fourth modified example shown in FIG. 15, the switching control signal of the changeover switch 46 is set to 4 bits of the identification information, so that the generator polynomial x ^Fifteen + X ⁿ The n of +1 can be changed. That is, it is possible to change the parameters of the scrambling process according to the identification information.
[0105]
Next, FIG. 16 shows a configuration of a fifth modification of the scramble processing circuit 26. In FIG. 16, the same reference numerals as those in FIG. 15 denote the same components that operate in the same manner as in FIG. 15, and a detailed description of the operations will be omitted.
[0106]
The scramble processing circuit 26 of the fifth modification shown in FIG. 16 changes the generator polynomial and the preset value among the parameters of the scramble processing according to the identification information. As in FIG. 15, the selected polynomial is changed by selecting each selected terminal of the changeover switch 46 based on the identification information, and the 4 bits from the sector address detection circuit 32 are logically operated based on the identification information to make the register 33 The preset value selected from is changed.
[0107]
That is, in the scramble processing circuit 26 of the fifth modification shown in FIG. 16, the terminal 50 is supplied with the identification information from the interface circuit 12. This identification information is supplied to the identification information detection circuit 59. The identification information detection circuit 59 extracts the lower 4 bits, for example, when the identification information is composed of 4 bits of the identification information and 4 bits or more. The four bits extracted from the identification information are sent to the logical operation circuit 60. The logical operation circuit 60 is also supplied with 4 bits from the sector address detection circuit 32. The logical operation circuit 60 performs a logical operation on the four bits from the sector address detection circuit 32 using the four bits from the identification information detection circuit 59, and divides the four bits obtained by this operation into the register 33. In FIG. 16, the four bits extracted from the identification information detection circuit 59 are also output as a switching control signal for the changeover switch 46 as described above. The output of the selected terminal selected according to the switching control signal is sent to the exclusive OR circuit 42.
[0108]
As described above, in the scramble processing circuit 26 of the fifth modification shown in FIG. 16, the four bits from the sector address detection circuit 32 used when selecting a preset value from the preset value table of the register 33 are used. By performing a logical operation on the 4 bits of the identification information, the preset value selected from the preset value table is changed, and the switching control signal of the changeover switch 46 is changed to 4 bits of the identification information. , Generator polynomial x ^Fifteen + X ⁿ +1 of n is changed. Thereby, in the scramble processing circuit 26 of the fifth modified example shown in FIG. 16, it is possible to change the generation polynomial of the parameter of the scramble processing and the preset value according to the identification information.
[0109]
Next, FIG. 17 shows a configuration of a sixth modification of the scramble processing circuit 26. In FIG. 17, components that operate in the same manner as in FIG. 16 are denoted by the same reference symbols as in FIG. 16, and detailed description of their operations is omitted.
[0110]
The scramble processing circuit 26 of the sixth modification shown in FIG. 17 changes the generator polynomial and the preset value among the scramble processing parameters according to the identification information. The selected polynomial is changed by selecting each selected terminal of the changeover switch 46 in the same manner as in FIG. 16 described above based on the 4 bits extracted from the identification information of, and the 16-bit preset value output from the register 33 is changed to 16 bits The preset value is changed by performing a logical operation based on the identification information.
[0111]
In FIG. 17, the terminal 50 is supplied with identification information composed of 16 bits per word from the interface circuit 12. This identification information is supplied to the identification information detection circuit 62. The identification information detection circuit 62 supplies the 16 bits of the identification information to the logical operation circuit 63. The logical operation circuit 63 is also supplied with the preset value selected by the 4 bits of the sector address detection circuit 32 from the preset value table of the register 33. The logical operation circuit 63 performs a logical operation on the 16-bit preset value supplied from the register 33 using the 16 bits supplied from the identification information detection circuit 62, and obtains a 16-bit value obtained by this operation. The bit is output as a preset value to the shift register 41. In FIG. 17, the four bits extracted from the identification information detection circuit 62 are also output as a changeover control signal for the changeover switch 46. The output of the selected terminal selected according to the switching control signal is sent to the exclusive OR circuit 42.
[0112]
As described above, in the scramble processing circuit 26 of the sixth modification shown in FIG. 17, the preset selected from the register 33 by the 4 bits of the sector address detection circuit 32 is logically operated by the 16 bits of the identification information. By doing so, the preset value is changed, and the switching control signal of the changeover switch 46 is set to 4 bits of the identification information, whereby the generation polynomial x ^Fifteen + X ⁿ +1 of n is changed. Thereby, in the scramble processing circuit 26 of the sixth modification shown in FIG. 17, it is possible to change the generator polynomial of the parameter of the scramble processing and the preset value according to the identification information.
[0113]
Next, FIG. 18 shows a configuration of a seventh modification of the scramble processing circuit 26. In FIG. 18, the same reference numerals as those in FIG. 17 denote the components operating in the same manner as in FIG. 17, and a detailed description of their operations will be omitted.
[0114]
The scramble processing circuit 26 of the seventh modification shown in FIG. 18 changes the generator polynomial and the preset value among the parameters of the scramble processing according to the identification information. The selection polynomial is changed by selecting each of the selected terminals of the changeover switch 46 in the same manner as in FIG. 17 described above based on the four bits extracted from the identification information of FIG. The preset value table composed of words is changed by performing a logical operation on the identification information composed of 16 words.
[0115]
In FIG. 18, the terminal 50 is supplied with identification information composed of 16 words from the interface circuit 12. This identification information is supplied to the identification information detection circuit 64. The identification information detection circuit 64 supplies 16 words of the identification information to the logical operation circuit 65. The logical operation circuit 65 is also supplied with a preset value for 16 words constituting a preset value table of the register 66. The logical operation circuit 65 performs a logical operation on the 16-word preset value supplied from the register 66 using the 16-word identification information supplied from the identification information detection circuit 64, and obtains the result by this operation. The data of 16 words obtained is stored in the register 66 again. The preset value selected from the re-stored preset value table is output from the register 66 based on the 4 bits of the sector address detection circuit 32 and sent to the shift register 41. In FIG. 18, the four bits extracted from the identification information detection circuit 64 are also output as a switching control signal for the changeover switch 46. The output of the selected terminal selected according to the switching control signal is sent to the exclusive OR circuit 42.
[0116]
As described above, the scramble processing circuit 26 of the seventh modified example shown in FIG. 18 performs a logical operation on the preset value table stored in the register 66 based on the identification information, thereby obtaining the preset value table itself. Is changed, and the switching control signal of the changeover switch 46 is set to 4 bits of the identification information, whereby the generator polynomial x ^Fifteen + X ⁿ +1 of n is changed. Thus, in the scramble processing circuit 26 of the seventh modification shown in FIG. 18, it is possible to change the generator polynomial and preset value of the parameter of the scramble processing according to the identification information.
[0117]
The configuration for changing the generator polynomial among the modifications of the above-described scramble processing circuit is not limited to the above-described structures shown in FIGS. 15 to 18. May be used.
[0118]
As described above, the scramble processing circuit 26 encrypts the sector data from the sectoring circuit 13 based on the identification information, and stores the encrypted data in the disk-shaped recording medium 21. In the case of recording, in the signal reproducing apparatus according to the seventh embodiment of the present invention shown in FIG. 11, the identification information extracted by the identification information extracting circuit 130 is sent to the decryption means, that is, the descrambling processing circuit 119. The descrambling processing circuit 119 performs an encryption / decryption process using the identification information.
[0119]
As described above, when the encryption using the identification information is performed at the time of signal recording, if the identification information cannot be taken out at the time of signal reproduction, the encryption / decryption means cannot correctly decrypt the encrypted data. . That is, since the above-mentioned identification information cannot be taken out by the ordinary signal reproducing apparatus, the above-mentioned encryption cannot be decrypted and the reproduction becomes impossible. Therefore, the recording medium cannot be copied illegally. Further, for example, even if the encrypted recording data is directly taken out from the recording medium and copied directly to another recording medium, it cannot be reproduced by a normal signal reproducing device. This also prevents piracy, as it loses value and the meaning of duplication is lost.
[0120]
Next, in each of the specific examples described above, the configuration for recording and reproducing signals on and from the recording medium has been described. For example, signals such as telephone lines, optical cables, When transmitting and receiving signals using a transmission medium, it is possible to add identification information to the transmitted / received signals in the same manner as described above. By adding identification information to a transmission / reception signal in this manner, the same effect as described above can be obtained.
[0121]
Here, as a specific configuration example of the present invention in the case of performing the transmission and reception of the signal, for example, the configuration of performing transmission and reception by radio waves as shown in FIGS. 19 and 20 can be considered. FIG. 19 shows the configuration of a signal transmitting apparatus as an eighth specific example of the present invention, and FIG. 20 shows the configuration of a signal receiving apparatus as a ninth specific example of the present invention.
[0122]
In the signal transmission device according to the eighth embodiment of the present invention shown in FIG. 19, a terminal 200 is supplied with a digital video signal and a digital audio signal. The signal supplied to the terminal 200 is sent to the encoding circuit 201. The encoding circuit 201 has, for example, a configuration from the above-described interface circuit 12 to the error correction encoding circuit 16 in FIG. 2, and the encoding device 201 is provided with an identification information replacement circuit 202 similar to that described above. I have. This identification information replacement circuit 202 adds identification information to the signal which has been error-correction-coded as described above. The signal to which the identification information is added is output from the encoding circuit 201. The coded signal from the coding circuit 201 is sent to a modulation circuit 203, where the coded signal is subjected to a predetermined digital modulation, and then sent to a mixer circuit 204 including, for example, a linear multiplier. The transmission carrier frequency signal from the transmission frequency generation circuit 205 is supplied to the mixer circuit 204. Therefore, in the mixer circuit 204, the transmission carrier frequency signal is modulated by the signal from the modulation circuit 203. The transmission signal in the transmission frequency band output from the mixer circuit 204 is amplified to a predetermined level by the transmission amplifier and transmitted via the antenna 207.
[0123]
On the other hand, in the signal receiving apparatus according to the ninth embodiment of the present invention shown in FIG. 20, the signal received by the antenna 300 is amplified by the receiving amplifier 301 to a predetermined level. The output signal of the receiving amplifier 301 is sent to the mixer circuit 302. The mixer circuit 302 is also supplied with a reception frequency signal whose phase has been synchronized with the carrier from the reception frequency generation circuit 303. Therefore, in this mixer circuit 302, a modulated signal of the carrier, that is, a reception signal is extracted by synchronous detection. The output signal of the mixer 302 is sent to a demodulation circuit 304, where a process of demodulating the modulation performed by the modulation circuit 203 of the transmission system is performed. The signal extracted by the demodulation processing is sent to a decoding circuit 305, and the decoding circuit 305 performs a decoding processing corresponding to the encoding in the encoding circuit 201 of the modulation system. The decoding circuit 305 is provided with an identification information extraction circuit 306 similar to that described above, and the identification information is extracted in the same manner as described above. After that, the signal decoded by the decoding circuit 305 is output from the terminal 307.
[0124]
Further, as a specific configuration example in the case of transmitting and receiving a signal via a transmission line such as a telephone line or an optical cable, for example, a configuration as shown in FIG. 21 can be considered. To the terminal 400 in FIG. 21, a signal output from the modulation circuit 17 in FIG. 2, for example, to which identification information is added as described above, is supplied. The signal supplied to the terminal 400 is transmitted from the transmission interface 401 on the transmission side to the transmission path 402, and the signal transmitted via the transmission path 402 is transmitted to the terminal 404 via the transmission interface 403 on the reception side. The signal supplied to the terminal 404 is sent to, for example, the configuration after the demodulation circuit 115 in FIG.
[0125]
In addition, as the identification information used in each of the specific examples described above, in addition to the history information indicating whether the digital signal is an original digital signal or a copied digital signal as described above, the encryption key information, a manufacturer ID, It is also possible to use maker ID, formatter ID, copy management information such as copy inhibition / permission, and the like.
[0126]
Further, a compression-encoded signal can be used as the digital signal. When a digital video signal is compression-coded, for example, compression coding according to the MPEG2 standard, which is standardized by MPEG (Moving Picture Image Coding Experts Group: a study organization of moving image coding for storage), can be performed. . In the case of compression encoding of a digital audio signal, compression encoding or the like, which is called ARTAC (Adaptive Transform Acoustic Coding) in consideration of human auditory characteristics, can be performed. When the digital signal is compression-coded as described above, the signal recording device or the signal transmission device of each of the above-described embodiments of the present invention is provided with a compression-coding means. The apparatus and the signal receiving apparatus are provided with a decompression decoding means for decompressing the compression encoding.
[0127]
Further, the digital video signal may be a signal of an image such as a still image, a graphics image, or a character, in addition to a signal of a normal moving image.
[0128]
Examples of the disc-shaped recording medium include an optical disc on which recording is performed by pits, an optical disc on which recording can be performed only once, a rewritable magneto-optical disc, a phase change optical disc, an organic dye optical disc, and an ultraviolet laser beam. Various optical disks, such as an optical disk having a multi-layered recording film, can be used. In addition, as the recording medium, a tape-shaped recording medium such as a video tape, a semiconductor storage medium such as a so-called IC card or various memory elements, or a magnetic disk medium such as a hard disk or a flexible disk can be used.
[0129]
【The invention's effect】
In the present invention, when recording or transmitting another specific information together with a digital signal such as a digital video signal or a digital audio signal, a predetermined part of an error correction code for the digital signal is replaced with the specific information. By recording or transmitting the specific information, the specific information can be recorded or transmitted with less influence on the recording capacity, the transmission capacity, and the transmission speed.
[0130]
Also, in the present invention, by replacing a predetermined part of the error correction code for the digital signal with the specific information and recording or transmitting the signal, the signal recorded on the recording medium or transmitted to the transmission medium is converted into the original digital signal. It is possible to specify whether the signal is a signal or a copied digital signal. Further, when an illegal copy is made, it is possible to disable reproduction or prevent transmission.
[Brief description of the drawings]
FIG. 1 is a diagram used for describing sector data to which identification information is added.
FIG. 2 is a block circuit diagram showing a schematic configuration of a signal recording device according to a first specific example of the present invention.
FIG. 3 is a block circuit diagram showing a schematic configuration of a signal reproducing apparatus according to a second specific example of the present invention.
FIG. 4 is a block circuit diagram showing a schematic configuration of a signal reproducing device according to a third specific example of the present invention.
FIG. 5 is a diagram used to describe a recording area on an optical disc as an example of a recording medium.
FIG. 6 is a block circuit diagram illustrating a schematic configuration of a signal recording device according to a fourth specific example of the present invention.
FIG. 7 is a block circuit diagram showing a schematic configuration of a signal reproducing apparatus according to a fifth specific example of the present invention.
FIG. 8 is a block circuit diagram showing a configuration example of a scramble processing circuit provided in the signal recording devices of the first and fourth specific examples of the present invention.
FIG. 9 is a diagram showing a preset value table provided in the scramble processing circuit.
FIG. 10 is a block circuit diagram showing a schematic configuration of a signal recording device according to a sixth specific example of the present invention.
FIG. 11 is a block circuit diagram showing a schematic configuration of a signal reproducing apparatus according to a seventh specific example of the present invention.
FIG. 12 is a block circuit diagram showing a configuration of a first modification of the scramble processing circuit provided in the signal recording device according to the sixth specific example of the present invention.
FIG. 13 is a block circuit diagram showing a configuration of a second modification of the scramble processing circuit provided in the signal recording device according to the sixth specific example of the present invention.
FIG. 14 is a block circuit diagram showing a configuration of a third modification of the scramble processing circuit provided in the signal recording device according to the sixth specific example of the present invention.
FIG. 15 is a block circuit diagram showing a configuration of a fourth modification of the scramble processing circuit provided in the signal recording device according to the sixth specific example of the present invention.
FIG. 16 is a block circuit diagram showing a configuration of a fifth modification of the scramble processing circuit provided in the signal recording device according to the sixth specific example of the present invention.
FIG. 17 is a block circuit diagram showing a configuration of a sixth modification of the scramble processing circuit provided in the signal recording device of the sixth specific example of the present invention.
FIG. 18 is a block circuit diagram showing a configuration of a seventh modification of the scramble processing circuit provided in the signal recording device according to the sixth specific example of the present invention.
FIG. 19 is a block circuit diagram illustrating a schematic configuration of a signal transmission device according to an eighth specific example of the present invention.
FIG. 20 is a block circuit diagram illustrating a schematic configuration of a signal receiving device according to a ninth specific example of the present invention.
FIG. 21 is a block circuit diagram illustrating a configuration example of a main part of transmission and reception via a transmission path.
[Explanation of symbols]
Reference Signs List 11 interface circuit, 13 sectorization circuit, 14, 26 scramble processing circuit, 15 header addition circuit, 16 error correction coding circuit, 17 modulation circuit, 18 synchronization addition circuit, 19 driver, 20 recording head, 21 disk recording medium, 22, 111 spindle motor, 23 identification information replacement circuit, 32 sector address detection circuit, 33, 57, 61, 66 register, 41 shift register, 42, 43 exclusive OR circuit, 51, 53, 55, 58, 59, 62, 64 identification information detection circuit, 52, 54, 56, 60, 61, 63, 65 logic operation circuit, 112 reproduction head, 113 binarization circuit, 114 synchronization separation circuit, 115 demodulation circuit, 116, error correction decoding Circuit, 117 sector decomposition circuit, 118 header decomposition circuit, 119, 11 2 descramble processing circuit, 120 interface circuit, 130 identification information extraction circuit, 131, 135 reference identification information extraction circuit,
132 ROM, 133 comparison circuit, 134 CPU

Claims (9)

Adding an error correction code to a predetermined area with respect to the digital signal,
Replace a part of the predetermined area of the error correction code with specific information,
A signal recording method characterized by recording a digital signal to which an error correction code obtained by replacing a part of the predetermined area with specific information is added to a recording medium. 2. The signal recording method according to claim 1, wherein an error correction code is added to the specific information. 3. The signal recording method according to claim 2, wherein the specific information and the error correction code for the specific information are distributed and recorded in a plurality of predetermined units. Adding an error correction code to a predetermined area with respect to the digital signal,
Replace a part of the predetermined area of the error correction code with specific information,
A signal transmission method comprising transmitting a digital signal to which an error correction code obtained by replacing a part of the predetermined area with specific information is added. Receiving a digital signal to which an error correction code in which a part of a predetermined area is replaced with specific information is added,
A signal receiving method, wherein the error correction code and the specific information are extracted before decoding the error correction code. 6. The signal receiving method according to claim 5, wherein the encryption performed on the digital signal is decrypted by using the specific information. The extracted specific information is compared with reference information prepared in advance, and reception is performed when the specific information and the reference information match, and reception is prohibited when the specific information does not match. The signal receiving method according to claim 5, wherein Error correction encoding means for adding an error correction code to a predetermined region with respect to the digital signal;
Specific information replacing means for replacing a part of a predetermined area of the error correction code with specific information,
A signal transmitting device for transmitting a digital signal to which an error correction code obtained by replacing a part of the predetermined area with specific information is added. Receiving means for receiving a digital signal to which an error correction code obtained by replacing a part of a predetermined area with specific information ,
Error correction decoding means for decoding the error correction code of the digital signal to which the error correction code is added,
A signal receiving apparatus comprising: a specific information extracting unit configured to extract the error correction code and the specific information before decoding the error correction code by the error correction decoding unit.

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