JPH1055616A - 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 converting the initial value of the scramble with the key signal. SOLUTION: A key signal inputting part 2 is structured with a specific key provided so that a key signal is outputted 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 based on the initial value imparted by the key signal. Means 6 for converting scramble initial value makes a conversion to the scramble initial value as specified by the key signal, generating a M group pseudo random signal in the scramble circuit 5 corresponding to each initial value. Thus, illegal copying is prevented by scrambling on the basis of a key signal and converting the scramble initial value 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. And a multiplexing means for newly creating a scrambled means for scrambling an original signal based on a key signal to output a scrambled signal, and changing an initial value of scrambling of the scrambled means by the key signal. And a scramble initial value 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 and output based on the scrambled data and a key signal which changes the initial value of the scramble are recorded.

Further, the disc cutting apparatus of the present invention comprises a key signal detecting means for detecting a key signal which has been scrambled by changing an initial value of the input signal from the input signal, and detecting the initial value based on the key signal. A descrambling means for changing the scrambled input signal back to the original state, and generating cutting data from the descrambled signal descrambled by the descrambling means, based on the cutting data. This is to create a master disk.

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 the key signal by pressing the keyboard. This key signal is supplied to the scramble initial value conversion means. In the scramble initial value conversion means, this key signal is converted into a plurality of scramble initial values specified by the key signal. 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. That is, in the multi-stage shift register, 1 is put in the last stage, 1 is put in the j-th stage and the corresponding stage designated by the key signal, and 0 is put in the other stages, and the predetermined stage is fed back. As a result, the bit stream as the input signal 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.

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 the descramble initial value 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 descrambling means.

In the descrambling initial value conversion means, an M-sequence generating operation similar to scrambling is performed.
That is, the key signal is converted into a descramble initial value specified by the key signal. The key signal whose descramble initial value has been converted is supplied to descramble means. The order of the term to be fed back in the polynomial is determined by designating a term corresponding to the key signal of the M-sequence generating polynomial in the descrambling means, and the pseudo-random signal of the M-sequence is generated in the descrambling means. In other words, in the multi-stage shift register, 1 is inserted in the j-th stage and the corresponding stage designated by the key signal, and 0 is inserted in the other stages, and a predetermined stage is fed back, so that a scrambled signal is obtained. A descramble is applied. In this way, the scrambled bit stream of the main signal is descrambled by a pseudo-random function (M-sequence generating polynomial) having an initial value specified by the key signal. Is subtracted, and the original code is decoded. 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 a laser beam modulated with the data signal to the master disk by the cutting machine, and the disk serving as the master is Created.

[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 initial value conversion means 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 initial value converting means 6 provides different scramble initial values corresponding to the plurality of stages of shift registers, converts the scramble initial value into a scramble initial value designated by a key signal supplied from the key signal input means 2, Has a function of generating an M-sequence pseudo-random signal. The scramble initial value conversion means 6 may be provided integrally with the scramble circuit 5, or may be provided separately.

The authoring data generation unit 7 sectorizes the scrambled signal scrambled by the scramble circuit 5 into a predetermined size, inserts a key signal when adding a header signal to the scrambled signal, and converts the authoring data. Has the function of generating.

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 part 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 initial value of scrambling is changed are recorded.

The cutting machine system 13 includes a key signal separator 14, a descramble initial value converter 15, a descramble circuit 16, a cutting data generator 17, a laser modulator 18, and a master disc generator 19. Having. 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. One key signal separated by the key signal separation unit 14 is supplied to a descramble initial value conversion unit 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 obtained by changing an initial value of scrambling with respect to the input signal from the input signal. The descrambling 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 a descrambling means for changing the initial value based on the key signal and descrambling the input signal which has been scrambled so as to return the input signal to its original state. A shift register having a plurality of stages, 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 shift register of the stage specified by the key signal. The descramble initial value converting means 15 provides different descramble initial values corresponding to the plurality of stages of shift registers, and converts the same into the descramble initial value specified by the key signal supplied from the key signal separation unit 14. , M for descrambling means
It has a function of generating a series of pseudo-random signals. The descramble initial value conversion means 15 may be provided integrally with the descramble circuit 16, or may be provided separately.

The cutting data generation unit 17 performs a scramble process for sectorizing the signal data that has been returned after being subjected to the descrambling, adding an error detection signal, and removing an offset of a DC component of the signal. And performs the 8/16 modulation by adding an error correction code process, and inserts 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 corresponding to the data modulated in this manner and exposing a 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.

The video encoding circuit 23 is an MPEG encoding circuit.
2 so that the input signal is DCT (D
iscrete Cosine Transform)
A DCT transformation circuit for transforming, a quantization circuit for quantizing the DCT-transformed coefficient, an inverse quantization circuit for inversely quantizing the quantized transform coefficient, and an inverse D
An inverse DCT transform circuit for performing CT transform, 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 motion compensated input 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 has a predetermined key so that a key signal is output by the holder of the original signal supplied to the authoring system 3. The scramble circuit 5, as shown in FIG.
An n-stage shift register 41 having a final stage for feedback;
The stage (j) specified by the key signal of the stage shift register 41
An exclusive OR circuit 42 which receives the output of the last stage (n) for feedback and an input, and an exclusive OR circuit 42
And an input signal Bm, and an exclusive OR circuit 43 that feeds back the output scrambled signal Am to the first stage (1) of the n-stage shift register 41. The input signal Bm is a signal output from the multiplex circuit 26, and the scrambled signal Am is
This is the signal output from. Here, the key signal has a function of designating an initial value to be given to the n-stage shift register 41 of the scramble circuit 5. Also, the key signal at this time has a meaning only as a symbol to the outside, and the entity is configured to be specified inside the device in the authoring system. This makes it more difficult to steal the key signal from the outside. The scramble circuit 5 generates an M-sequence pseudo-random signal based on the initial value. Equation 1 shows this scramble polynomial.

[0040]

## EQU1 ## a (n-1) X^**(N-1) + a (n-2) X
^**(N-2) + ... + a1X ^**1 + a0X^**0

Each term of the polynomial represented by the equation (1) corresponds to a particular part of the n-stage shift register shown in FIG. That is,
The first term corresponds to the n-th stage, the second term corresponds to the n-th stage,..., The n-th term corresponds to the second stage, and the n-th term corresponds to the first stage. That is, the second to n-th terms are specified by the key signal. Then, the scramble initial values of the stages of the coefficients a (n-1) to a0 of the term designated by the key signal among the coefficients a (n-1) to a0 of each term are converted.

Here, assuming that the output of the stage (j) designated by the key signal of the n-stage shift register shown in FIG. 4 is Am-j and the output of the last stage (n) for feedback is Am-n, Scrambled signal Am output from scramble circuit 5
Is as shown in Equation 2 below.

[0043]

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

The scramble initial value conversion means 6 provides a different scramble initial value for the n-stage shift register 41, converts it into a scramble initial value designated by a key signal, and converts the scramble circuit into a scramble circuit corresponding to each initial value. 5 to generate an M-sequence pseudo-random signal.
The initial value of the scramble is determined by the coefficients a (n-1) to a0
First, the n-th stage corresponding to the coefficient a (n-1) of the first term is set to "1", and the other coefficients a (n-2) to a0 are related to the term specified by the key signal. The corresponding other stages are configured so that the M-sequence function is specified by appropriately designating "1" and "0", and the scramble initial value changes according to the key signal. Here, the number of “1” s to be placed in other stages corresponding to the coefficients a (n−2) to a0 is plural. Also, to change the initial value in relation to the term specified by the key signal,
For example, a term specified by a key signal and "1" and "0" are repeated every other or every other term from this term.
At this time, corresponding to the term specified by the key signal,
Or try to change multiple numbers. The initial value corresponding to the key signal is constituted by a variable element such as a register or a memory, for example, so as to be fixedly specified by hardware in advance in order to keep the contents confidential. By doing so, it is possible to set the initial value from the outside using a personal computer, etc., and even if the contents of the key signal are leaked, the contents can be changed and set as soon as possible, and the system adaptability can be taken. Can be strengthened.

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 is composed of a fixed part of 24 bits and a stream ID (identification) part of 8 bits. In MPEG2-PS, a stream ID is defined so that up to 16 channels of video and 32 channels of audio can be obtained at the maximum. The “packet length” following this indicates the data length of the packet following this field. The 2-bit control code following the packet length is MPEG
1 is used for identification.

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 descramble circuit 16 has a final stage for feedback, and the scrambled signal A
an n-stage shift register 50 having m as an input, an exclusive OR circuit 51 having as inputs the stage (j) designated by the key signal of the n-stage shift register 50 and the output of the final stage for feedback (27); , The output of the exclusive OR circuit 51 and the scrambled signal Am as input, and the output signal Cm
And an exclusive OR circuit 52 that outputs The scrambled signal Am is output from the scrambled signal separation circuit 3.
2 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 expressed by Equation 1 corresponds to each stage of the n-stage shift register shown in FIG. As shown in FIG. 4, the first term is n-th stage, the second term is the n-th stage, the third term is the n-th stage,... The term corresponds to the first stage. That is, the second to n-th terms are the ones whose initial values are specified by the key signal. Then, it is configured such that the descramble initial value is converted in relation to the term specified by the key signal among the coefficients a (n−1) to a0 of each term. Here, the output of the stage (j) designated by the key signal of the n-stage shift register shown in FIG.
j, if the output of the last stage (n) for feedback is Am-n,
Output signal Cm output from descramble circuit 16
Becomes 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 descramble coefficient conversion means 15 calculates n
A different descramble initial value is provided corresponding to the shift register 50 of the stage, converted into a descramble initial value designated by a key signal, and
It is configured to generate a sequence of pseudo-random signals. The initial value of the descramble is calculated by the coefficient a (n−
1) to a0, the n-th stage corresponding to the coefficient a (n−1) of the first term is set to “1”, and the other coefficients a (n−2) are related to the term specified by the key signal. ) To a0, the M-sequence function is specified by designating "1" and "0" as appropriate, and the descramble initial value is changed according to the key signal.

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 detecting code adding circuit 34 adds an error detecting code (EDC), and the scrambling circuit 35 generates a DC component (DC) generated by signal recording. In order to reduce the offset, for example, the data of the even-numbered samples is rearranged with a delay of two CIRC units. Error correction code (ECC) processing circuit 36
Performs error correction code (ECC) processing on the data signal. This error correction code processing is performed by CIRC (Cro
ss Interleaved ReedSolomo
n Code).

The sectorized bit stream, which has been subjected to the ECC processing, is subjected to modulation suitable for a signal on the disk by an 8/16 modulation circuit 37, and additional information is added by a synchronization signal insertion circuit 38. It has a configuration in which a synchronization signal including the synchronization signal is inserted at the head of a signal block. The 8/16 modulation circuit 37 is configured to divide the original signal into 8 bits and perform EFMplus modulation for making the recording signal correspond 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 presses down the keyboard and inputs it to the key signal input section 2. The key signal from the key signal input unit 2 is converted to a scramble initial value conversion means 6
Supplied to The scramble initial value conversion means 6 converts the data into a scramble initial value specified by the key signal. Then, by designating a term corresponding to the key signal of the M-sequence generating polynomial expressed by the equation (1), the term of the order in which the initial value is converted in the polynomial is determined. Occur.
That is, in the n-stage shift register 41 shown in FIG.
First, among the coefficients a (n-1) to a0 of each term of the M-sequence generating polynomial, the n-th stage corresponding to the coefficient a (n-1) of the first term is set to "1", and the term specified by the key signal In relation to the above, the other stages corresponding to the other coefficients a (n−2) to a0 are appropriately designated “1” and “0” to specify the M-sequence function, and the scramble initial state is determined according to the key signal. The value changes. In this way, the bit stream of the main signal is scrambled with a pseudo-random function (M-sequence generating polynomial) having an initial value 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, the header signal and key signal insertion circuit 28
In step (1), a key signal used for scrambling is included in a part of the header signal for descrambling when cutting the master disc.

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 initial value 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 initial value conversion means 15, an M-sequence generating operation similar to scrambling is performed. That is, in the n-stage shift register 50 shown in FIG. 5, the coefficients a (n-1) to a0 of each term of the M-sequence generating polynomial
First, the n-th stage corresponding to the coefficient a (n-1) of the first term is set to "1", and the other coefficients a (n-2) to a0 are related to the term specified by the key signal. By specifying “1” and “0” for the other corresponding stages as appropriate, the M-sequence function is specified, and the initial descramble value changes according to the key signal. Thus, the bit stream of the scrambled signal Am is descrambled by a pseudo-random function (M-sequence generating polynomial) having an initial value specified 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. ECC processing is performed in the error correction code circuit 36, and the data signal is supplied to the next 8/16 modulation circuit 37. 8/1
In the 6-modulation circuit 37, the original signal is divided every 8 bits, and the EFMplu which makes the recording signal correspond to 16 bits.
s modulation 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.

The signal having undergone various signal processing and having the synchronization signal inserted therein is supplied to the 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.

As described above, in the above example, the initial value for the shift register for scrambling and descrambling is defined by the key signal. This is because when using key signals, it is conceivable to prepare a large number of key signals to increase the security of the system so that the key signals are not stolen and pirated easily. Then, if the conventional key signal is made to correspond to the scramble / descramble circuit, a large number of scramble circuits and descramble circuits must be prepared in the authoring system and the cutting machine system, and the circuit scale increases. This hinders the downsizing of the device and the resulting cost reduction.

In the above example, when the initial value is selected as the key signal, the initial value corresponding to the key signal is changed so that the key signal can have many variations as a means against theft of the key signal. If a large number are prepared, only one type of scramble circuit and descramble circuit corresponding to this need be prepared, so that the circuit scale can be reduced, and the size and cost of the device can be reduced. As described above, not only piracy is prevented, but also piracy can be prevented while reducing the size and cost of the apparatus.

On the other hand, when there is a margin in circuit scale and cost and a higher piracy prevention capability is required,
Instead of using a single initial value, a scramble circuit, and a descramble circuit as in the above example, a plurality of initial values, a scramble circuit, and a descramble circuit may be used in combination. This allows
It can be an advanced piracy prevention measure that is more difficult to break through. In this case, the key signal has a function of setting an initial value, a scramble circuit, and a descramble circuit. By doing so, it is possible to read an initial value and a specific combination of a scramble circuit and a descramble circuit from the key signal, and thereby scramble and descramble the key signal. Can be realized.

Also, if the key signal for descrambling is determined once at the beginning, the setting on the descrambling side can be performed, and it is not necessary to know each signal block thereafter. For this reason, the authoring system side of the key signal used in scrambling, when passing the data signal, put the key signal in a fixed format in the first part of the transfer data signal indicating that the data signal is to be transferred, Thereafter, the head portion of the data signal is set, and at this time, all data signals including the header signal (not including the key signal) are scrambled uniformly. In this case, the descrambler reads the key signal first, detects the head of the data signal, and simply descrambles all data signals based on the read key signal to reproduce a necessary complete packet data signal. .

By doing so, it is not necessary to extract the key signal after detecting the header signal portion,
The circuit of the whole system can be simplified, and it is not necessary to set or insert a new key signal in the header signal part. Therefore, anti-piracy measures can be easily implemented even in data systems where signals and the like cannot be easily added in existing systems. Can be made to correspond. The key signal in this case includes a function of designating the initial value, the scrambling circuit and the descrambling circuit in the above-described example, and combining them.

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 each key signal can be understood. Even if a key signal is not specified for each signal block, an initial value of the descramble on the cutting machine side may be set once, and the descramble may be performed using the initial value of the descramble.

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 scrambled in advance with the initial value based on the key signal of the signal data by the authoring system, and the key signal is read from the signal data by the disk cutting system for creating a master disk. After creating a master disk according to the normal procedure after descrambling and returning to normal data based on the above, even if you illegally copy the signal data and bring it to the cutting factory to create a pirated version, the disk cutting system will be brought in Since the signal data that has been scrambled is always passed through the descrambling process, signal data that has not been properly scrambled is descrambled because its data content is randomly descrambled. Iwa It becomes impossible to create a pirated that.

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.

[0079]

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 scrambling means for scrambling an original signal based on a key signal and outputting a scrambled signal, and a scramble initial value for changing an initial value of scrambling of the scramble means by the key signal. Since the conversion means is provided, the original signal can be subjected to complicated scrambling using the scramble initial value specified by the key signal.Thus, a person who is not a person who knows the key signal and the scramble initial value properly, Third parties other than the original signal holder can descramble. Since the scrambled signal is not copied, a normal signal cannot be recorded even if the scrambled signal is copied, and an irregularly scrambled signal is recorded, so that a so-called pirated disc can be prevented. Play.

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 initial value conversion means provides different initial values respectively corresponding to a plurality of stages of shift registers, converts the initial values into scramble initial values designated by a key signal, and outputs the M-sequence to the scramble means. Since the pseudo-random signal is generated, there is an effect that complicated scrambling can be applied to the original signal with a simple configuration.

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 a plurality of initial values such that the last stage of the shift register is 1 and the other stages are 1 and 0, and the initial value of the scramble specified by the key signal is provided. And the scrambling means generates an M-sequence pseudo-random signal, so that it is possible to increase the difficulty of scrambling and to apply complex scrambling to the original signal.

Further, according to the recording medium of the present invention, when a plurality of material signals are respectively coded and the coded 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 that changes the initial value of the scramble are recorded, a third party other than the original signal holder can scramble. Since it cannot be unraveled, even if this scrambled signal is copied, a normal signal cannot be recorded, and an irregularly scrambled signal is recorded. It has the effect of being able to.

Further, according to the disk cutting apparatus of the present invention, key signal detecting means for detecting a scrambled key signal by changing an initial value of the input signal from the input signal, and an initial signal based on the key signal. A descrambling means for changing the value and restoring the scrambled input signal to an original signal, and generating cutting data from the descrambled signal descrambled by the descrambling means to generate cutting data. Since the master disk is created based on the key signal, the scrambled input signal is descrambled based on the key signal to return to the original normal signal, and then the master disk is cut. Can be but not scrambled fraud The key signal cannot be detected from the input signal in the first place, and furthermore, only a random abnormal signal can be reproduced by descrambling this signal, so that a so-called pirated disk can be prevented. It works.

[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 disc 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 disc 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 of one embodiment of the disc cutting device according to 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 initial value conversion means, 7 authoring data generation section, 8 signal data and key signal output circuit, 9 Disk output unit, 10
Tape output unit, 11 Hard disk output unit, 12
Online data output unit, 13 cutting machine system, 14 key signal separation unit, 15 descramble initial value conversion means, 16 descramble circuit, 1
7 cutting data generator, 18 laser modulator,
Reference Signs List 19 master disk creation section, 20 video signal input section, 21 audio signal input section, 22 auxiliary data signal input section, 23 encoding circuit, 24 encoding circuit, 2
5 Encoding circuit, 26 Multiplex circuit, 27
Sectorizing circuit, 28 header signal and key signal inserting circuit, 30 synchronization detecting circuit, 31 key signal extracting circuit, 32 scrambled signal separating circuit, 33 sectorizing circuit, 34 error detecting code adding circuit, 35 scrambling circuit, 36 error correcting code processing Circuit, 378
/ 16 modulation circuit, 38 synchronization signal insertion circuit, 39 laser modulator, 40 laser beam generator, MS master disk, 41 n-stage shift register, 42 exclusive OR circuit, 43 exclusive OR circuit, 50
n-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 initial value converter for changing an initial value of the scramble of the scrambler by the key signal are provided. A signal processing device characterized by the above-mentioned. 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 initial value conversion means provides different initial values for the plurality of stages of shift registers, A signal processing device, wherein the signal is converted into a scramble initial value designated by a signal, and the scramble means generates an M-sequence pseudo-random signal. 3. The signal processing device according to claim 1, wherein the scrambler receives the original signal as input, and based on an output of a shift register of a plurality of stages and at least a shift register of a stage specified 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 sets the last stage of the shift register to 1, and the other stages to 1 and 0. A plurality of initial values to be converted into scramble initial values designated by the key signal, and the scrambling means generates an M-sequence pseudo-random signal. 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 an initial value of the scramble are changed. A recording medium characterized by recording the key signal and the key signal. 5. A key signal detecting means for detecting a scrambled key signal by changing an initial value of the input signal from an input signal; and changing the initial value based on the key signal and scrambling the key signal. A descrambling means for descrambling the input signal, and generating cutting data from the descrambled signal descrambled by the descrambling means, based on the cutting data. A disc cutting device characterized in that a disc is created.