JPH1055615A - Signal processor, recording medium and disk cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent illegal copying by scrambling the original signal based on a key signal, outputting the scrambled signal, and changing the coefficient of the scramble with the key signal. SOLUTION: A key signal inputting part 2 is structured so that one specific character of the alphabet is outputted as the key signal by the holder of the original signal supplied to an authoring system 3. A scramble circuit 5 generates for example an M group pseudo random signal represented by formula I from an input signal imparted by the key signal. Scramble coefficient converting means 6, providing twenty-six different scramble coefficients corresponding to the twenty-six characters of the alphabet, makes a conversion to the scramble coefficient as specified by the key signal to form a pseudo random signal in the scramble circuit 5. Thus, illegal copying is prevented by scrambling on the basis of a key signal and changing the scramble coefficient again with the key signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a DVD, for example.
The present invention relates to a signal processing device for creating data to be recorded on a (digital video disc), a recording medium on which the data is recorded, and a disc cutting device for creating a master disc based on the data.

[0002]

2. Description of the Related Art FIG. 6 shows a DVD using an encoder for simultaneously encoding video data and audio data.
1 shows a configuration example of an editing system (authoring system). This authoring system uses a digital VTR6
0, an encoder 61, and a computer 62.

A digital VTR 60 is a video reproducing unit 60A for reproducing digital video data from a video tape TP (Tape 1) recorded in a digital system.
And audio tape TP recorded in digital format
(Tape 2) and an audio reproducing unit 60B for reproducing digital audio data.

An encoder 61 encodes video data Dv and audio data Da reproduced from the digital VTR 60 under the control of a computer 62, and further multiplexes the encoded video data and encoded audio data. Output as a series of bit streams.

[0005] Video data Dv and audio data Da are encoded using MPEG2 (Moving Pic).
This is an encoding for data compression by the “Two Experts Group 2”, which is performed according to each algorithm described in the video encoding program and the audio encoding program stored in the main storage device of the computer 62, respectively, and the encoded video is encoded. The multiplexing of the data and the encoded audio data is performed according to an algorithm described in a multiplexing program also stored in the main storage device of the computer 62.

As described above, in this authoring system, the video data Dv and the audio data Dv as reproduction data from the digital VTR 60 or the like.
a, and converts the video data Dv and the audio data Da to respective predetermined data rates.

The creation of data in such an authoring system is performed in a studio or the like. The data created by the authoring system is recorded on a recording medium, brought to a factory where a cutting machine is located, and both are formatted in a predetermined format. And recording on a recording medium such as a DVD to produce a master disk.

[0008]

However, in the conventional authoring system, a third party reproduces signal data from a recording medium such as a disk or a tape on which regular signal data recorded by a genuine maker is recorded. Even if the reproduced data is copied to a recording medium to create unauthorized data, and the recording medium on which the copied data is recorded is brought into a factory, the factory side may copy the authentic data and the copied illegal data. Because it is indistinguishable, a master disc is created with illegal data on a cutting machine, and so-called pirated discs are manufactured on this master disc, thereby preventing the production of pirated copies of such illegal data. There was an inconvenience that you could not

Conventionally, no countermeasures have been taken against piracy, but the following two countermeasures against copying have been taken. The first countermeasure is to detect a trace at the time of cutting by inverting a specific bit (for example, LSB) of a signal portion during the cutting by the cutting machine so as to leave a trace at the time of cutting in the signal portion. Is used to determine whether the signal to be handled is a copied signal or an original signal. Note that the inversion of this specific bit is of such a degree that it cannot be discriminated by humans, has no effect on the image, and is used only for judging whether the signal is a copy or an original. However, such a determination can be made only by a playback device that can detect the inversion of a specific bit, so that a signal can be played back by a normal player or the like without any problem, which is insufficient as a countermeasure against piracy. .

A second copy countermeasure is a copy restriction based on the SCMS (Single Copy Management System) system adopted in a DAT (Digital Audio Tape) system or the like, and by setting a digital copy inhibition bit only once. In this case, copying is permitted only once. However, such a method can be copied only once, which is also insufficient as a countermeasure against piracy.

The present invention has been made in view of the above points, and has been made in view of the above circumstances. A signal processing apparatus for reproducing a disc on which an original signal is recorded and preventing a pirate from illegally cutting the disc based on the reproduced data, It is intended to provide a medium and a disk cutting device.

[0012]

According to the present invention, there is provided a signal processing apparatus comprising: an encoding means for encoding a plurality of material signals; and a multiplexing means for multiplexing the plurality of material signals encoded by the encoding means to obtain an original signal. A scrambler for scrambling an original signal based on a key signal and outputting a scrambled signal, and a scrambler for changing a scramble coefficient of the scrambler by the key signal. And a coefficient conversion means.

In the recording medium of the present invention, when a plurality of material signals are encoded, and when the plurality of encoded material signals are multiplexed and an original signal is newly created, the original signal is converted to a key signal. The scrambled signal which is scrambled based on the scrambled signal and a key signal whose scramble coefficient is changed are recorded.

Further, the disc cutting apparatus of the present invention comprises a key signal detecting means for detecting a key signal which is scrambled by changing a coefficient with respect to the input signal from the input signal, and changing the coefficient based on the key signal. A descrambling means for descrambling the scrambled input signal, generating cutting data from the descrambled signal descrambled by the descrambling means, and generating a master disc based on the cutting data. Is created.

According to the signal processing device of the present invention, the following operations are performed. In the signal processing device, original signal data is supplied to an encoding unit and a multiplexing unit. Specifically, a video signal is supplied to the video encoding unit, an audio signal is supplied to the audio encoding unit, and an auxiliary data signal is supplied to the auxiliary data encoding unit. In the video encoding means, the video signal is subjected to moving image compression encoding. The audio signal is audio-encoded by the audio encoding means. The auxiliary data signal is encoded by the auxiliary data encoding means. The signal encoded by each encoding means is supplied to the multiplexing means. In the multiplexing means, each signal is switched to a packet of data such as video, audio, auxiliary data and the like, time-division multiplexed and converted into one bit stream.

On the other hand, the holder of the original signal inputs one letter of the first alphabet of his name by pressing down the keyboard. The key signal corresponding to one alphabetic character is supplied to the scramble coefficient conversion means. In the scramble coefficient conversion means, this key signal is converted into a numerical value by setting the letter a of the alphabet to 1 and sequentially increasing it by one to make z to 26.
Is converted to a scramble coefficient of Then, by designating a term corresponding to the key signal of the M-sequence generating polynomial, the term of the order to be returned in the polynomial is determined, and a pseudo random signal of the M-sequence is generated in the scrambling means. In this case, it is necessary to determine the initial value of the shift register stage. For example, in a 27-stage shift register, 1 is inserted into the j-th stage specified by the key signal, and 0 is set in all other stages. The bit stream as an input signal is scrambled by feeding back a predetermined stage in a state in which is inserted. In this way, the bit stream of the main signal is scrambled by a pseudo random function (M-sequence generating polynomial) having a coefficient specified by the key signal.

Further, according to the recording medium of the present invention, the following operations are performed. In the above-described signal processing device, a header including a synchronization signal for facilitating synchronization of a signal from the scrambled bit stream and smoothly performing various operations in a subsequent stage such as a disc cutting device. A signal is inserted at the head of a signal block in units of each signal called a sector. At this time, a key signal used for scrambling is included in a part of the header signal for descrambling when cutting the master disc. In the bit stream, signal data and a key signal are recorded on a recording medium as complete packet data meaning final data after editing.

Further, according to the disk cutting device of the present invention, the following operations are performed. In the disc cutting apparatus, complete packet data recorded and output on the recording medium described above is supplied as an input signal. After the synchronization signal is detected from the input signal, the detected synchronization signal is supplied to key signal detection means. In the key signal detecting means, a header signal portion is extracted based on the detected synchronization signal, and a key signal used in scrambling is extracted.
The extracted key signal is supplied to descrambling coefficient conversion means.

The signal portion of the scrambled area is separated from the input bit stream. Only the separated scrambled signal is supplied to the descrambler.

In the descrambling coefficient conversion means,
An M-sequence generating operation similar to scrambling is performed. That is, the key signal is set to 1
The key signal is converted to a designated descramble coefficient of 1 to 26 by increasing the number z by 26. The key signal whose descrambling coefficient has been converted is supplied to descrambling means. By designating a term corresponding to the key signal of the M-sequence generating polynomial in the descrambling means, the term of the order to be returned in the polynomial is determined, and the descrambling means generates an M-sequence pseudo-random signal. In other words, in the 27-stage shift register, 1 is placed in the j-th stage designated by the key signal, and all other stages are filled with 0, and the predetermined stage is fed back, so that the descrambling of the scrambled signal is performed. Can be hung. In this way, the scrambled bit stream of the main signal is descrambled by a pseudo random function (M-sequence generating polynomial) having a coefficient specified by the key signal, and an M-sequence pseudo-random signal component is obtained from the scrambled signal. Subtraction results in the decoding of the original code. The data thus decoded becomes the original data to be cut on the disc.

In this manner, cutting data is generated from the reproduced original data signal, and the cutting is performed by irradiating the master disk with the laser beam modulated with the data by the cutting machine to produce the master disk. Is done.

[0022]

The present embodiment will be described below. First, the configurations of the authoring system and the cutting machine system according to the present embodiment will be described with reference to FIG. This system has a signal data input unit 1, a key signal input unit 2, an authoring system 3 and a cutting machine system 13. The signal data input unit 1 is, for example, a reproducing device for reproducing signal data as a plurality of materials or a transmission line for transmitting the signal data, and has a function of supplying the signal data. The key signal input unit 2 is, for example, a keyboard and has a function of supplying a key signal.

The authoring system 3 has an encoding and multiplexing unit 4, a scramble circuit 5, a scramble coefficient conversion unit 6, an authoring data generation unit 7, and a signal data and key signal output circuit 8. The encoding and multiplexing unit 4 performs encoding for compressing a plurality of signal data supplied from the signal data input unit 1 and multiplexes the plurality of encoded signal data, It has the function of outputting original signal data. Here, the encoding and multiplexing unit 4 constitutes an encoding unit and a multiplexing unit. The scrambling circuit 5 has a function of generating an M-sequence pseudo-random signal and scrambling the original signal data with the M-sequence pseudo-random signal.

Here, the scramble circuit 5 constitutes a scramble means, which receives an original signal as an input, and inputs the original signal to a plurality of stages of shift registers and to at least an input of the shift register based on an output of the shift register of the stage designated by the key signal. And an exclusive OR circuit that outputs a signal to be fed back. The scramble coefficient conversion means 6 provides different scramble coefficients respectively corresponding to the plurality of stages of shift registers, and uses a hardware or software method so that the scramble coefficient specified by the key signal supplied from the key signal input means 2 is obtained. It has a function of converting the connection and causing the scrambling means to generate an M-sequence pseudo-random signal. The scramble coefficient conversion means 6 may be provided integrally with the scramble circuit 5, or may be provided separately.

The authoring data generator 7 sectorizes the scrambled signal scrambled by the scrambler circuit 5 into a predetermined size, inserts a key signal when adding a header signal to the scrambled signal, and generates authoring data. It has a function to do.

The signal data and key signal output circuit 8
It has a function of recording signal data to which a key signal output from the key signal input unit 2 supplied from the authoring data generation unit 7 is added to a predetermined recording medium and outputting the data.
The signal data and key signal output circuit 8 includes a disk output unit 9, a tape output unit 10, and a hard disk output unit 1.
1 and an online data output unit 12. The disk output unit 9, the tape output unit 10, the hard disk output unit 11, and the online data output unit 12 are switched according to the type of medium on which each output signal is recorded. The disk output unit 9 is used when the recording medium is a disk, and is composed of a disk recording device. Tape output unit 10
Is used when the recording medium is a tape, and is composed of a tape recording device. The hard disk output unit 11 is used when the recording medium is a hard disk, and includes a hard disk device. The online data output unit 12 is used when the transfer medium is online data, and includes an interface and an online cable.

As described above, when each of the recording media encodes a plurality of material signals and multiplexes the plurality of encoded material signals to newly create an original signal,
A scrambled signal output by scrambling the original signal based on the key signal and a key signal whose scramble coefficient is changed are recorded.

The cutting machine system 13 includes a key signal separation unit 14 and a descrambling coefficient conversion unit 1.
5, a descramble circuit 16, a cutting data generator 17, a laser modulator 18, and a master disk generator 19. The key signal separating unit 14 has a function of separating and extracting a key signal from signal data and a key signal recorded on a recording medium. Key signal separation unit 1
One of the key signals separated at 4 is supplied to a descramble coefficient conversion means 15, and the other scrambled signal data is supplied to a descramble circuit 16. Here, the key signal separating section 14 constitutes a key signal detecting means for detecting a key signal by changing a scramble coefficient for the input signal from the input signal. Descramble circuit 16
Has a function of returning the scramble applied to the signal data by the scramble circuit 5 of the authoring system 3. That is, the descramble circuit 16 is configured to perform an operation opposite to that of the scramble circuit 5.

Here, the descrambling circuit 16 constitutes descrambling means for descrambling such that the scrambled input signal is restored by changing the coefficient based on the key signal, and receives the scrambled signal as an input. The shift register includes a plurality of stages of shift registers and an exclusive OR circuit that outputs a signal that is fed back to an input of the shift register based on at least an output of the stage of the shift register specified by the key signal. The descrambling coefficient conversion means 15 provides different descrambling coefficients for the plurality of stages of shift registers,
Has a function of converting to a descrambling coefficient specified by a key signal supplied from the PC and generating a pseudorandom signal of M series in the descrambling means. The descrambling coefficient conversion means 15 may be provided integrally with the descrambling circuit 16, or may be provided separately.

The cutting data generation unit 17 sectorizes the signal data returned after being descrambled, adds an error detection signal and error correction means, performs 8/16 modulation processing, and performs signal processing. Has a function of removing a DC component offset and inserting a synchronization signal. The laser modulator 18 has a function of modulating the laser light output with the data signal thus processed. The master disk creation unit 19 has a function of generating a laser beam according to the data modulated in this way and exposing the photoresist on the master disk to cut a signal onto the disk.

As described above, the cutting machine system includes the key signal detecting means and the descramble means, generates cutting data from the descrambled signal descrambled by the descramble means, and generates the cutting data based on the cutting data. It has the function of creating a master disk.

Next, detailed configurations of the authoring system 3 and the cutting machine system shown in FIG. 1 will be described with reference to FIGS. 2 and 3, respectively. First, FIG.
Now, the configuration of the authoring system 3 will be described.
2, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Signal data input unit 1
Has an image signal input unit 20, an audio signal input unit 21, and an auxiliary data signal input unit 22. Video signal input unit 2
0 is, for example, a digital VTR 6 as shown in FIG.
The video playback unit 60A is configured to output a playback video signal by playing back a helical track. Similarly, the audio signal input unit 21 includes an audio reproducing unit 60B of the digital VTR 60, and reproduces a helical track to output a reproduced audio signal. The auxiliary data signal input unit 22 is also connected to the digital VTR 60
An auxiliary data signal is output by reproducing a longitudinal track such as a control signal.

Encoding and multiplexing circuit 4
Is an encoding circuit 23 for encoding a video signal, an encoding circuit 24 for encoding an audio signal, an encoding circuit 25 for encoding an auxiliary data signal, and an encoding circuit 23 for encoding an encoded audio signal, an audio signal, and an auxiliary data signal. And a multiplexing circuit 26 for multiplexing. Encoding circuit 23, encoding circuit 24 and encoding circuit 2
5 is MPEG2 (Moving Picture E)
Encoding for data compression by xparts Group 2) is performed. The MPEG standard includes MPEG1 which is a compression encoding standard for storage media such as CD-ROM.
And MPEG, a compression encoding standard for a wide range of applications, including MPEG1 applications
However, in the present embodiment, MPEG2, which is optimal for compressing a moving image of a DVD, is used.

Video encoding circuit 23, MPEG2
The input signal is converted to a DCT (Di
a DCT transform circuit for performing a Cosine Transform, a quantization circuit for quantizing the DCT-transformed coefficient, an inverse quantization circuit for inversely quantizing the quantized transform coefficient, and a dequantized transform coefficient. Inverse DC
An inverse DCT conversion circuit for performing T conversion, a motion compensation circuit for performing motion compensation on the inverse DCT-transformed signal, an adder for adding the motion-compensated signal to the inverse DCT-transformed signal, And a subtracter for subtracting the output signal.

The audio encoding circuit 24 includes a filter bank for converting a time sample of an input signal into frequency component sub-bands, a bit allocation circuit for bit-allocating the input signal by a psychoacoustic model, and a sub-band for this frequency component. And a bit stream forming circuit for quantizing.

The multiplex circuit 26 includes an encode circuit 23, an encode circuit 24, and an encode circuit 25.
The video, audio and auxiliary data bit streams encoded in step (1) are integrated into a single unit including synchronization and multiplexed. The multiplexing method includes a program stream (Prog) constituting one program (program).
ram stream, MPEG2-PS) and a transport stream (transport stream, MPEG2) capable of simultaneously configuring a plurality of programs.
-TS). In the present embodiment, M
PEG2-PS is used. In this way, the configuration is such that a bit stream of main signal data is generated.

Multiplexing by packets is performed, for example, for video,
When multiplexing signal data such as audio and auxiliary data, each of video, audio, auxiliary data and the like is divided into streams (bit strings) of an appropriate length called packets, and additional information such as a header signal described below is added. In addition, the data packet is appropriately switched to data packets such as video, audio, and auxiliary data, and time-division-divided into a single bit stream. Each of these packets is provided with information for identifying a data attribute such as video, audio, and auxiliary data, which is referred to as a header signal described later, at the beginning.

The packet length depends on the specifications of the storage medium or the transmission network. For example, there is a long one such as an optical disk, and each packet length may be a fixed length or a variable length. In MPEG2-PS (program stream), a layer called a pack layer is provided above data such as video, audio, and auxiliary data, and is usually handled in a unit called a pack in which a plurality of packets are bundled.

On the other hand, the key signal input section 2 allows the holder of the original signal supplied to the authoring system 3 to output the first alphabet of one's own name as a key signal so as to output 26 characters of the alphabet. It has a key. As shown in FIG. 4, the scramble circuit 5 includes a 27-stage shift register 41 having stages corresponding to 26 letters of the alphabet and a final stage for feedback, and a stage designated by a key signal of the 27-stage shift register 41 (j ) And the output of the feedback last stage (27) as an input, and the output of the exclusive OR circuit 42 and the input signal Bm as input and shift the output scrambled signal Am by 27 stages. Register 4
Exclusive OR circuit 43 returning to the first stage (1) of 1
And The input signal Bm is a signal output from the multiplex circuit 26, and the scrambled signal Am is a signal output from the scramble circuit 5. The scramble circuit 5 generates an M-sequence pseudo-random signal.
Equation 1 shows this scramble polynomial.

[0040]

[Equation 1] X ^** 26 + z * X ^** 25 + y * X ^** 24 +
・ + B * X ^** 1 + a * X ^** 0

Each term of the polynomial represented by Equation 1 corresponds to a particular part of the 27-stage shift register shown in FIG. That is, the first term is 27 steps, the second term is 26 steps, and the third term is 2nd step.
... Item 26 corresponds to the second stage, and item 27 corresponds to the first stage. That is, the second to twenty-seventh items are items specified by the key signal. The scramble coefficient is converted into the coefficient z to a of the term designated by the key signal among the coefficients z to a of each term.

Here, the output of the stage (j) designated by the key signal of the 27-stage shift register shown in FIG.
Assuming that the output of the last stage (27) for feedback is Am-n, the scrambled signal A output from the scramble circuit 5
m is as shown in the following Expression 2.

[0043]

Am = (BmAm-jAm-n) Here, □ indicates the additive (exclusive or) by mod2.

The scramble coefficient conversion means 6 provides 26 different scramble coefficients corresponding to the 26 letters of the alphabet corresponding to the shift register 41 of 27 stages, converts them into scramble coefficients designated by the key signal, 5 to generate an M-sequence pseudo-random signal. The scramble coefficient is sequentially increased by 1 from 26 characters of the alphabet, with a being 1, 1, b being 2, and c being 3, and z being digitized as 26, and the scramble coefficient changes according to the key signal. It is configured as follows.

The authoring data generator 7 has a sectorizing circuit 27 and a header signal and key signal inserting circuit 28. The sectorizing circuit 27 divides the scrambled bit stream into sector length units, which are signal processing units. The header signal and key signal insertion circuit 28 has a configuration in which a header signal including a synchronization signal and additional information is inserted at the head of the signal block into a bit stream divided into sectors.
Examples of the additional information include a signal indicating an attribute for identifying a video signal and an audio signal. The header signal and key signal insertion circuit 28 inserts the key signal used for scrambling into a part of the header signal. The reason why the authoring data is generated in this way is to facilitate synchronization of the signal from the bit stream and to smoothly perform the processing operation in the subsequent stage such as the cutting machine system.

The data structure of the multiplexed bit stream thus configured is MPEG2-PS (Progr.
am Stream), and its data structure and bit stream have a hierarchical structure as follows. This bit stream has a large number of 1-bit flags and the like, and is a byte stream that is byte-aligned for each sector unit such as a header signal. Information indicating the length is preceded by a data portion that is not a fixed length. It is configured so that unnecessary parts can be skipped.

The data structure of the multiplexed bit stream (MP
EG2-PS) has a lower layer (packet layer) and an upper layer (pack layer). The upper layer (pack layer) is configured as follows. 1
One program is sometimes called a sequence,
Begins with the first pack header and ends with the end code. The pack is generally composed of a plurality of packets, and the pack at the head of the program has an information group called a system header which describes an overview of the entire stream as parameter information. This system header is required to be added to the first pack, but is optional in the second and subsequent packs.

The lower layer (packet layer) is configured as follows. MPEG packet is P
ES (Peckeized Element St)
remPacket), and the structure is MPEG
Since the header part is complicated because it is used in common with 2-TS, it is easy to understand hierarchically. 32
The “packet start code of bits” includes a fixed portion of 24 bits and a stream ID (identification) portion of 8 bits.
In MPEG2-PS, up to 16 channels of video,
The stream ID is defined so that up to 32 audio channels can be used. "Packet length" following this
Indicates the data length of the packet following this field.
The 2-bit control code following the packet length is used for discrimination from MPEG1.

The authoring data generated in this way is supplied to the signal data and key signal output circuit 8, and is output from the disk output unit 9, the tape output unit 10, the hard disk output unit 11, or the online data output unit 12. It is recorded on the corresponding recording medium at the selected output unit. Such signal data and data output from the key signal output circuit 8 and recorded on each recording medium are called complete packet data.

Next, the configuration of the cutting machine system will be described with reference to FIG. The key signal separation unit 14
It has a synchronization detection circuit 30, a key signal separation circuit 31, and a scrambled signal separation circuit 32. Synchronous detection circuit 3
0 has a configuration for detecting a header signal and detecting a synchronization signal included in the header signal. The process of detecting a header from a bit stream is described below. The data structure of MPEG2 video data has a six-layer hierarchy including a sequence layer, a GOP layer, a picture layer, a slice layer, a macroblock (MB) layer, and a block layer. Regarding image type,
Pictures include I-pictures, (intra-frame coded images),
There are three types of P-pictures (inter-frame forward predictive coded images) and B-pictures (bidirectional predictive coded images), and these are PSC (Picture)
Coding Type).

The process of synchronization detection will be described below. Synchronization detection is performed for each access unit. For example, one frame is an access unit for a video signal and one audio frame for an audio signal. The synchronization method of MPEG2 is
Information such as a time stamp indicating when synchronization detection, reproduction, and decoding should be performed is added to each access unit of other data such as a video signal, an audio signal, and an auxiliary data signal.
This time stamp includes SCR (System Cl)
The time reference is given by information such as an ock reference (system time reference value). The time stamp includes PTS (time management information of reproduction output).
And DTS (decoding time management information).

The key signal extraction circuit 31 extracts a key signal from the header signal. The key signal is extracted by, for example, detecting the head of the key signal by counting a specific number of bytes with a counter from the head of the header signal or the synchronization signal, and reading the number of bytes of the key signal from the head. Can be extracted. Further, the scrambled signal separation circuit 32 is configured to separate the bit stream into signal portions in a scrambled region.

As shown in FIG. 5, the descrambling circuit 16 has a stage corresponding to 26 letters of the alphabet and a final stage for feedback, and includes a 27-stage shift register 50 and a 27-stage shift register 50 to which the scrambled signal Am is input. An exclusive OR circuit 51 to which the output of the stage (j) specified by the key signal of the stage shift register 50 and the output of the final stage for feedback (27) are input, and the output of the exclusive OR circuit 51 and the scrambled signal And an exclusive OR circuit 52 that outputs an output signal Cm with Am as an input. The scrambled signal Am is a signal output from the scrambled signal separation circuit 32, and the output signal Cm is a signal output from the descramble circuit 16. The descrambling circuit 16 is configured to generate an M-sequence pseudo-random signal, subtract the M-sequence pseudo-random signal from the scrambled signal Am, and decode it into the original code. This descramble polynomial uses the same equation (1) as that used for scrambling.

Each term of the polynomial represented by the equation 1 corresponds to a particular part of the 27-stage shift register shown in FIG. As shown in FIG. 4, the first term is 27th stage, the second term is 26th stage,
The third term corresponds to the 25th step,... The 26th term corresponds to the second step, and the 27th term corresponds to the first step. That is, the second to twenty-seventh items are items specified by the key signal. Then, the descramble coefficient is converted into the coefficients z to a of the terms specified by the key signal among the coefficients z to a of each term. Here, assuming that the output of the stage (j) designated by the key signal of the 27-stage shift register shown in FIG. 5 is Am-j and the output of the last stage for feedback (27) is Am-n, the descrambling circuit The output signal Cm output from 16 is as shown in the following Expression 3.

[0055]

Cm = (Am Am-j Am-n) = (Bm Am-j Am-n Am-j Am-n) = Bm where □ is the addition (mod Crucibu or).

The descrambling coefficient conversion means 15
26 different descrambling coefficients corresponding to the 26 letters of the alphabet are provided corresponding to the seven-stage shift register 50, and converted into a descrambling coefficient designated by a key signal. It is configured to generate a signal. The descrambling coefficient is sequentially increased by 1 from 26 letters of the alphabet in accordance with the scrambling coefficient by setting a to 1, 1, b to 2, and c to 3, and... It is configured that the descrambling coefficient changes accordingly.

The cutting data generating unit 17 includes a sectorizing circuit 33, an error detection code (EDC) adding circuit 3
4, a scramble circuit 35, an error correction code (ECC) processing circuit 36, an 8/16 modulation circuit 37, and a synchronization signal insertion circuit 38. The sectorizing circuit 33 divides the input bit stream into sectors of a signal processing unit, the error detection circuit 34 adds an error detection code (EDC), and the error correction code (ECC) processing circuit 34 corrects an error in the data signal. Perform code (ECC) processing. This error correction code processing is performed in a form in which a Reed-Solomon product code is combined in an interleave manner, and is a CIRC (Cross Interleaved).
Ved Reed Solomon Code). The scramble circuit 35 is configured, for example, to delay and rearrange even-numbered sample data by two CIRC units so as to reduce an offset of a direct current component (DC) generated by signal recording.

The sectorized bit stream that has been subjected to the ECC processing is then subjected to modulation suitable for the signal on the disk by the 8/16 modulation circuit 37, and then includes additional information by the synchronous insertion circuit 38. It has a configuration to insert a synchronization signal at the beginning of a signal block. 8/16 modulation circuit 37
Is configured to perform EFMplus modulation in which an original signal is divided into 8 bits and a recording signal corresponds to 16 bits.

The laser converter 18 has a laser modulator 39. The laser modulator 39 modulates the laser light output of the cutting laser light. The master disk creation section 19 has a laser beam generator 40 and a master disk MS. The laser beam generator 40 is composed of a high-power laser oscillator. Master disk MS is DV
This is a master disk for D plate making. Although not shown, the master disk MS is configured to be rotationally driven by a rotational driving unit such as a stepping motor during cutting.

According to the authoring system and the cutting machine system configured as described above, the following operations are performed. In the authoring system shown in FIG. 2, original signal data is supplied from a signal data input unit 1 to an encoding and multiplexing circuit 4. Specifically, a video signal is supplied from the video signal input unit 20 to the encoding circuit 23, an audio signal is supplied from the audio signal input unit 21 to the encoding circuit 24, and the auxiliary data is input from the auxiliary data signal input unit 22 to the encoding circuit 25. Signals are supplied respectively. In the encoding circuit 23, the video signal is subjected to moving image compression encoding according to the MPEG2 standard. The audio signal in the encoding circuit 24 is MPEG
Audio encoding is performed according to two standards. In the encoding circuit 25, the auxiliary data signal is subjected to predetermined encoding. The signals encoded by the encoding circuits 23, 24 and 25 are supplied to a multiplex circuit 26.
In the multiplex circuit 26, each signal is switched to a packet of data such as video, audio, auxiliary data, etc., time-division multiplexed, and converted into one bit stream.

On the other hand, the holder of the original signal inputs one letter of the first alphabet of his / her name into the key signal input section 2 by pressing the keyboard. Key signal input section 2
Is supplied to the scramble coefficient conversion means 6 from. In the scramble coefficient conversion means 6, the key signal is converted into a numerical value with the alphabet a set to 1 and z increased to 26 sequentially by one, and the key signal is converted into designated scramble coefficients of 1 to 26. Then, by designating a term corresponding to the key signal of the M-sequence generating polynomial represented by the equation (1), the term of the order to be fed back out of the polynomial is determined, and an M-sequence pseudo-random signal is generated in the scramble circuit 5. That is, in the 27-stage shift register 41 shown in FIG. 4, 1 is input to the j-th stage specified by the key signal, and all the other stages are set to 0, and the predetermined stage is fed back, so that the input signal as the input signal is obtained. The bit stream is scrambled. In this way, the bit stream of the main signal is scrambled by a pseudo random function (M-sequence generating polynomial) having a coefficient specified by the key signal.

Thereafter, the scrambled bit stream is supplied to the sectorizing circuit 27. In the sectorizing circuit 27, the bit stream is divided into sector units forming a signal block. Thereafter, the bit stream is supplied to a header signal and key signal insertion circuit 28. In order to facilitate synchronization of signals from the scrambled bit stream and to smoothly perform various operations in a later stage of a cutting machine system or the like, a synchronization signal is added to a header signal and a key signal insertion circuit 28. Is inserted at the head of the signal block in units of signals of each sector. At this time, in the header signal and key signal insertion circuit 28, a key signal used for scrambling is included in a part of the header signal for descrambling when cutting the master disk.

The bit stream generated as the authoring data is supplied to the signal data and key signal output circuit 8 as complete packet data meaning the final data after editing. The disk on which the signal data and the key signal are recorded is output from the disk output unit 9 in accordance with the recording medium selected in the signal data and key signal output circuit 8. The tape on which the signal data and the key signal are recorded is output from the tape output unit 10. A hard disk on which signal data and key signals are recorded is output from the hard disk output unit 11. Online data output unit 1
From 2, the signal data and the key signal are sent out on the online transmission cable.

In the cutting machine system shown in FIG. 3, complete packet data recorded and output on the recording medium described above is supplied to the synchronization detecting circuit 30. The synchronization signal is detected by the synchronization detection circuit 30, and the detected synchronization signal is supplied to the key signal extraction circuit 31. In the key signal extraction circuit 31, a header signal portion is extracted based on the detected synchronization signal, and a key signal used for scrambling is extracted. The extracted key signal is supplied to the descramble coefficient conversion circuit 15.

The bit stream whose synchronization is detected is supplied to the scrambled signal separation circuit 32. The scrambled signal separation circuit 32 separates the scrambled main signal bit stream from the input complete packet data bit stream. The separated scrambled bit stream is supplied to the descramble circuit 16.

In the descrambling coefficient conversion means 15, an M-sequence generating operation similar to scrambling is performed.
In other words, the key signal is converted into a numerical value of 1 to 26, and the key signal is converted to a designated descramble coefficient of 1 to 26, where a is 1 in the alphabet, z is sequentially increased by 1, and z is 26. The key signal whose descramble coefficient has been converted is supplied to the descramble circuit 16. Then, in the descrambling circuit 16, the term corresponding to the key signal of the M-sequence generating polynomial expressed by the equation (1) is designated, so that the term of the order to be fed back out of the polynomial is determined. A pseudo random signal is generated. That is, in the 27-stage shift register 50 shown in FIG. 5, 1 is inserted into the j-th stage specified by the key signal, and all the other stages are filled with 0, and the predetermined stage is fed back to obtain a scrambled signal. It is scrambled. In this manner, the descramble is applied to the bit stream of the main signal by the pseudo random function (M-sequence generating polynomial) having the coefficient designated by the key signal. Then, the M-sequence pseudo-random signal is subtracted from the scrambled signal Am, and the original code is decoded. The data thus decoded becomes the original data to be cut on the disc.

The original data signal thus reproduced is divided into sector units by the sectorizing circuit 33 and supplied to the error detection code (EDC) adding circuit 34. In the error detection code adding circuit 34, an error detection code (EDC) is added to the data signal. The data signal to which the error detection code (EDC) is added is supplied to the scramble circuit 35. In the scramble circuit 35, the data signal is scrambled to reduce a DC component. The scrambled data signal is supplied to an error correction code (ECC) processing circuit 36. In the error correction code processing circuit 36, ECC processing is performed, and the result is supplied to the next 8/16 modulation circuit 37. In the 8/16 modulation circuit 37, the original signal is divided every 8 bits, and EFMplus modulation for making the recording signal correspond to 16 bits is performed. The bit stream subjected to the 8/16 modulation is supplied to the synchronization signal insertion circuit 38.

In the synchronizing signal insertion circuit 38, a synchronizing signal including additional information in a sector unit is inserted at the head of the signal block for the data signal.

A signal into which various signal processings have been performed and a synchronization signal has been inserted is supplied to a laser modulator 39. In the laser modulator 39, the input signal is modulated for emission of laser for cutting. The signal modulated for laser emission is supplied to a laser beam generator 40. In the laser beam generator 40, the high-power laser oscillator emits laser light to the master disk MS to perform cutting,
A disc which is a master for DVD plate making is created. A large number of commercial disks can be created by stamping using the master disk thus created.

In the above example, the key signal is used by being inserted into the header signal on the data stream, and at the time of data transfer, it is first known to the other party as a memo or title data, so that Instead of specifying a key signal for each signal block, a descrambling coefficient on the cutting machine side may be set once, and descrambling may be performed using the descrambling coefficient.

On the other hand, when a key signal is inserted in each header signal as in the above example, the key signal can be changed appropriately for each signal block. Therefore, since the data signal changes the key signal for each block, it is more difficult to execute the descrambling unless the key signal is read appropriately, and the security can be further improved, and the key signal is stolen at some time. Even if it has, it is possible to sufficiently prevent fraud.

As described above, in the above example, the data layer is pre-scrambled based on the key signal unique to the copyright holder of the signal data by the authoring system, and the key signal is converted from the signal data by the disk cutting system for creating a master disk. After reading and descrambled based on it to return to normal data, create a master disk according to the normal procedure, but even if you try to illegally copy the signal data and bring it to the cutting factory to create a pirated copy, the disk cutting system Since it is assumed that the signal data brought in is scrambled, the descrambling process is always performed, so for signal data that has not been properly scrambled, the data contents are randomly descrambled. Lost , It is not possible to create a so-called pirated.

In the case where the key signal cannot be specified in the disc cutting system, an alarm signal may be generated to stop the process from going on.

[0074]

According to the signal processing apparatus of the present invention, an encoding means for encoding a plurality of material signals, respectively, and a plurality of material signals encoded by the encoding means are multiplexed to newly create an original signal. A scrambler for scrambling an original signal based on a key signal and outputting a scrambled signal, and a scramble coefficient converter for changing a scramble coefficient of the scrambler according to the key signal. Since the original signal can be scrambled by using the scramble coefficient unique to the holder of the original signal by the key signal, a person who is not a person who knows the key signal and the scramble coefficient properly,
In other words, a third party other than the owner of the original signal cannot decrypt the scrambled signal, so that even if the scrambled signal is copied, a normal signal cannot be recorded, and an irregular signal scrambled at random. Is recorded, so that it is possible to prevent so-called pirated discs.

According to the signal processing device of the present invention,
In the above, the scrambling means receives the original signal as input, and outputs a signal that is fed back to the input of the shift register based on at least the output of the shift register of the plurality of stages and the shift register of the stage specified by the key signal. An OR circuit, wherein the scramble coefficient conversion means provides different scramble coefficients respectively corresponding to the plurality of stages of shift registers, converts the scramble coefficients into scramble coefficients designated by a key signal, and provides the scramble means with an M-sequence pseudo random number. Since the signal is generated, it is possible to scramble the original signal with a simple configuration.

According to the signal processing device of the present invention,
In the above description, the scramble means receives the original signal as input, and has a 27-stage shift register and at least one of the 26 letters of the alphabet designated by the key signal.
An exclusive OR circuit that outputs a signal that is fed back to the input of the shift register based on the output of the shift register of the stage corresponding to the character. Since 26 different scramble coefficients corresponding to the 26 characters are provided and converted into a scramble coefficient designated by a key signal and a scramble means generates an M-sequence pseudo-random signal, the difficulty of scrambling is increased. Thus, it is possible to scramble the original signal.

Further, according to the recording medium of the present invention, when a plurality of material signals are respectively encoded and the encoded plurality of material signals are multiplexed and an original signal is newly created, the original signal is reproduced. Since the scrambled signal output by scrambling based on the key signal and the key signal whose scrambling coefficient is changed are recorded, a third party other than the original signal holder descrambles. Therefore, even if the scrambled signal is copied, a normal signal cannot be recorded, and an irregularly scrambled signal is recorded, so that a so-called pirated disk can be prevented. This has the effect.

Further, according to the disk cutting apparatus of the present invention, key signal detecting means for detecting a key signal obtained by changing a coefficient with respect to the input signal and scrambling the input signal, and generating a coefficient based on the key signal And a descrambler for descrambling the scrambled input signal to restore the original signal, generating cutting data from the descrambled signal descrambled by the descrambler, based on the cutting data. Since the master disk is created, the scrambled input signal must be descrambled based on the key signal and returned to the original normal signal before cutting the master disk. But unscrambled fraud can be entered. The key signal cannot be detected in the first place, and only a random abnormal signal can be reproduced by descrambling the signal, so that the so-called piracy of the disc can be prevented. To play.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an authoring system and a cutting machine system according to an embodiment of a signal processing device and a cutting device according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of an authoring system according to an embodiment of the signal processing device of the present invention.

FIG. 3 is a diagram showing a configuration of a cutting machine system according to an embodiment of the cutting device of the present invention.

FIG. 4 is a diagram showing a circuit diagram of a scramble circuit according to an embodiment of the signal processing device of the present invention.

FIG. 5 is a diagram showing a circuit diagram of a descramble circuit according to an embodiment of the cutting device of the present invention.

FIG. 6 is a diagram showing a configuration of a conventional authoring system.

[Explanation of symbols]

1 signal data input section, 2 key signal input section, 3 authoring system, 4 encode and multiplex section, 5 scramble circuit, 6 scramble coefficient conversion means, 7 authoring data generation section, 8 signal data and key signal output circuit, 9 disk Output unit, 10
Tape output section, 11 hard disk output section, 12 online data output section, 13 cutting machine system, 14 key signal separation section, 15 descramble coefficient conversion means, 16 descramble circuit, 17
Cutting data generator, 18 Laser modulator, 19
Master disc creation unit, 20 video signal input unit, 21
Audio signal input section, 22 auxiliary data signal input section, 23
Encoding circuit, 24 encoding circuit, 25 encoding circuit, 26 multiplex circuit, 27 sectorizing circuit, 28 header signal and key signal inserting circuit, 30
Synchronization detection circuit, 31 key signal extraction circuit, 32 scrambled signal separation circuit, 33 sectorization circuit, 3
4 Error detection code (EDC) addition circuit, 35 scramble circuit, 36 error correction code (ECC) processing circuit, 37
8/16 modulation circuit, 38 synchronization signal insertion circuit, 39
Laser modulator, 40 laser beam generator, MS master disk, 4127-stage shift register, 42 exclusive OR circuit, 43 exclusive OR circuit,
50 27-stage shift register, 51 exclusive OR circuit, 52 exclusive OR circuit

Claims (5)

[Claims] A signal having encoding means for encoding a plurality of material signals, respectively, and multiplexing means for multiplexing the plurality of material signals encoded by the encoding means to newly create an original signal. In the processing device, a scrambler for scrambling the original signal based on a key signal and outputting a scrambled signal, and a scramble coefficient converter for changing a scramble coefficient of the scrambler with the key signal are provided. Characteristic signal processing device. 2. The signal processing apparatus according to claim 1, wherein the scrambler receives the original signal as an input, and based on an output of a shift register of a plurality of stages and at least an output of a shift register of a stage designated by the key signal. An exclusive OR circuit that outputs a signal that is fed back to the input of the shift register.The scramble coefficient conversion means provides different scramble coefficients corresponding to the plurality of stages of shift registers, and provides the key signal. A scramble coefficient designated by the formula (1), and the scramble means generates an M-sequence pseudo-random signal. 3. The signal processing apparatus according to claim 1, wherein the scrambler receives the original signal as input, and includes a 27-stage shift register and at least one of 26 letters of the alphabet specified by the key signal. An exclusive OR circuit that outputs a signal that feeds back to the input of the shift register based on the output of the shift register of the stage corresponding to the character, wherein the scramble coefficient conversion means corresponds to the shift register of the plurality of stages. Then, 26 different scramble coefficients corresponding to the 26 letters of the alphabet are provided, converted into scramble coefficients designated by the key signal, and the scramble means generates an M-sequence pseudo-random signal. Characteristic device. 4. A plurality of material signals are respectively encoded,
When an original signal is newly created by multiplexing a plurality of encoded material signals, a scrambled signal output by scrambling the original signal based on a key signal, and a coefficient of the scramble are changed. A recording medium characterized by recording the above key signal. 5. Key signal detecting means for detecting, from an input signal, a key signal that has been scrambled by changing a coefficient of the input signal, and the input signal scrambled by changing a coefficient based on the key signal. A descrambling means for descrambling, wherein cutting data is generated from a descrambled signal descrambled by the descrambling means, and a master disc is created based on the cutting data. A disk cutting device characterized by performing.