JPH08172616A - Scramble transmission method, scrambler, scrambled signal reproduction method, descrambler and scrambled signal reprodcing device - Google Patents

Abstract

PURPOSE: To obtain the scramble transmission method and the scrambler in which a displeasure feeling of a reproduced image of a reproduction device inhibiting descrambling is avoided. CONSTITUTION: A scrambler 11 applies scramble processing to transmission data, and generates an effect control signal instructing the reproduction method to a receiver side inhibiting descrambling and sends the signal with a scramble key. A descrambler 12 applies permission discrimination of descrambling and when permitted, the data are descrambled to reproduce a scramble signal and when no release is allowed, a scramble signal is reproduced according to the effect control signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scramble transmission method, a scramble apparatus, a scramble signal reproducing method, a descramble apparatus and a scramble signal reproducing apparatus for stirring a signal to limit reproduction of the signal.

[0002]

2. Description of the Related Art Conventionally, there is a scramble transmission technique in which a person who can reproduce the signal is limited by agitating the signal when transmitting or storing the signal and giving this decoding procedure to only those permitted. This scramble transmission technique is mainly used for controlling access to programs in pay broadcasting or the like, or preventing unauthorized copying for copyright protection in storage media such as VTRs and disks.

As described above, as a conventional scramble transmission technique, there is pay television broadcasting by a broadcasting satellite, and scramble broadcasting is performed for analog video signals. In addition, for analog video signals, there is also a system in which a specific analog signal is superimposed to cause the recording device to malfunction, thereby preventing unauthorized duplication.
However, these scramble transmission techniques are for analog video signals.

A scrambler using a conventional scramble transmission technique for digital signals is disclosed in, for example, Japanese Patent Laid-Open No. 6-90451. A block diagram of this conventional scrambler is shown in FIG. In FIG. 7, 27 is a scramble position detector, 28 is a random number generator, and 29 is an exclusive OR circuit.

The operation of the conventional scrambler having the above components will be described below. In FIG. 7, the input signal is an MPEG (Moving P).
image Expert Group: A video signal compliant with the International Standardization Organization ISO and International Electrotechnical Commission IEC joint working group) standard. For the MPEG standard, for example, ISO / IEC IS 1117
2 (1993), ISO / IEC CD 13818 and other standards and drafts.

Here, first, an outline of a video signal based on the MPEG standard will be described below with reference to FIG. As shown in FIG. 2, the data structure is composed of a sequence layer (layer), the sequence layer represents one moving image sequence, and the header portion indicates the sequence start code and the quantization width of each coefficient component of DCT. It includes various parameters such as a quantization matrix signal and data, and includes one or more GOPs (Group of Pictures (Group of Pictures)).
of picture)), and includes encoded data of a picture (image) group.

The GOP layer is composed of frames of arbitrary length, and has a GOP start code (Start-coa).
de) and a header portion and encoded data of one or more pictures. Also, the above-mentioned picture layer includes a picture start code (Start-code).
e) includes a header portion including encoded data of one or more slices, and the slice layer includes a header portion including a slice start code (Start-code) and one or more macro blocks. , And can include any macroblock. During this slice, q
_Scale signal is included.

Further, the macroblock will be described.
This macroblock is data in an area of 16 × 16 pixels, and a block of 8 × 8 pixels, which is a basic encoding processing unit, has four luminances and some 8 × 8 pixel blocks indicating color differences existing in the area. , Most of which are variable length codes, in which the motion vector signal, DC
DC component of T coefficient and DCT coefficient (First D
CT coefficient and Subsequence
nt DCT coefficient, DCT_coefficient) and q_scale
The code etc. which show a signal etc. are included.

FIG. 7 shows the above signals as input signals.
The operation will be described by returning to. The scramble position detection unit 27 includes a q_scale signal in the input signal, a sign bit indicating positive / negative in the motion vector, a DC component of the DCT coefficient,
A sign bit indicating whether the DCT coefficient is positive or negative is detected and sent to the random number generator 28 as a scramble timing signal. At this time, which code is to be detected is selected by the scramble mode signal. The random number generator 28 outputs the random number determined by the scramble key to the exclusive OR circuit 29 each time the scramble timing signal is input from the scramble position detector 27. In the exclusive OR circuit 29, a random number is exclusive ORed with the bit at the detected position to obtain a scrambled signal.

In the conventional scrambler configured as described above, when a specific code in the data is scrambled and the variable length code is the object of scrambling, the scramble is performed. By limiting the sign bit to show the sign so that the sign pattern can be read as a code later,
When the scrambled signal is descrambled on the receiving side, only the scrambled specific code is reproduced with a randomized value, and the rest of the data is reproduced correctly.

As described above, the conventional scramble apparatus realizes the scramble effect control so that the contents can be understood to some extent even on the receiver that does not have the descramble permission.

[0012]

However, in the conventional scramble apparatus as described above, the scrambled signal is reproduced as it is in the reproducing apparatus which does not have the descramble permission, so that not only the unscrambled signal is reproduced. However, the scrambled and randomized signal is also reproduced at the same time, and in some cases, the scrambled image reproduced due to the influence causes a discomfort to the viewer. It was

In view of the above points, the present invention provides a scramble transmission method capable of making a scrambled image in a reproducing device which does not have a descramble permission uncomfortable while maintaining security against illegal decoding. The purpose is to provide the device.

[0014]

In order to achieve the above object, a scramble transmission method according to a first aspect of the present invention is a scramble transmission in which a signal to be transmitted is scrambled, and the scrambled signal is received and reproduced. In the method, as the scrambling process, an effect control signal for instructing a reproduction method is generated for the receiving side that is not permitted to descramble the scrambled signal, and the descrambling process is performed as the reproduction process. When disapproval is detected, the scrambled signal is reproduced based on the effect control signal.

A scrambled signal reproducing method according to a seventh aspect is a method for reproducing a scrambled signal obtained by scrambling a video signal conforming to the MPEG standard, wherein q
The _scale signal is set to a predetermined value for reproduction processing regardless of the value in the scrambled signal.

A scramble signal reproducing method according to claim 8 is a scramble signal reproducing method in which a video signal conforming to the MPEG standard is scrambled, and the quantization matrix is irrespective of the value in the scramble signal. , Set to a predetermined value and perform reproduction processing.

A scramble signal reproducing method according to a ninth aspect is a scramble signal reproducing method in which a video signal conforming to the MPEG standard is scrambled, and the pixel value of each pixel to be reproduced is within a predetermined range. A certain signal is converted into a representative value in each range.

A scrambler according to a tenth aspect of the present invention is
An effect control signal generating means for generating an effect control signal for instructing a reproducing method is provided for a receiving side that does not permit descrambling of the scrambled signal.

The scrambler according to claim 11 is
The scrambler according to claim 10 further includes a stirring processing unit that stirs transmission data. The descramble device according to claim 16, further comprising: a scramble release permission determination unit and a conversion unit, and the scrambled signal when the conversion unit determines that the scramble release permission determination unit determines that the scramble release is not permitted. The signal that defines the inverse quantization process is converted into a predetermined value.

A scramble signal reproducing device according to a twenty-third aspect of the invention is provided with a scramble cancellation permission judging means and a reproduction processing means, and when the scrambling cancellation permission judging means judges that the scramble cancellation is not permitted in the reproduction processing means. The data in the scrambled signal is regenerated by setting the signal for controlling the reproduction level in the scrambled signal to a predetermined value without performing the descrambling process.

According to a twenty-fourth aspect of the present invention, there is provided a scramble signal reproducing apparatus according to the twenty-third aspect, further comprising a scramble canceling means and a data reproducing means, wherein the data reproducing means is descramble permission. If it is determined that the descrambling means performs the descrambling process, and is configured to reproduce the data in the scrambled signal, if the scramble release permission determining means determines that the scramble release is not permitted, The data in the scrambled signal is reproduced by using a signal for controlling the reproduction level in the data in the scrambled signal as a predetermined value without performing the descramble processing.

[0022]

According to the method of the first aspect, the effect control signal is transmitted from the transmitting side, and the effect control signal instructs the method of reproducing the scramble signal in the receiver without the descramble permission.

According to the method of claim 7, on the reproducing side, q_
The scale is set and reproduced, and the reproduction level of the randomized data is adjusted to such an extent that there is no discomfort. Claim 8
According to the above method, the reproduction level of the randomized data is adjusted for each frequency component of the DCT coefficient to such an extent that there is no discomfort.

According to the method of claim 9, the reproduced image is multi-valued to a value represented by each threshold value, and the randomized image is adjusted to an uncomfortable level. Claim 1
According to the configuration of claim 0 and claim 11, an effect control signal for instructing a method of reproducing a scramble signal in a receiver without descramble permission is generated, and this effect control signal is added to the scramble signal.

According to the structure of claim 16, the reproduction level of the signal which gives an unpleasant feeling in the scrambled video is reduced to reduce the influence of the randomized signal on the video. According to the configurations of claims 23 and 24, the effect control processing and the data reproduction processing are integrated so that the effect control processing is simultaneously performed at the time of data reproduction, and the data reproduction system performs MP processing.
A process for generating a signal for controlling a buffer and the like for preventing a break in the data reproducing system, which is necessary in the case of a decoder for EG video data, is omitted.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scramble transmission method and device (scramble transmission device) of an embodiment of the present invention will be described below.
This will be described with reference to the drawings.

FIG. 1 is a block diagram of a scramble transmission apparatus including a scramble apparatus, a descramble apparatus and a scramble signal reproducing apparatus for realizing the scramble transmission method of this embodiment.

In FIG. 1, 1 is an effect control signal generation processing section as an effect control signal generating means, 2 is a scramble processing section as an agitation processing section, 3 is an effect control signal reception processing section as an effect control signal receiving means, Reference numeral 4 is a descramble processing unit as conversion means, 5 is a scramble release permission determination processing unit as scramble release permission determination means, and 6 is M.
A video decoder for reproducing a bit stream compliant with the PEG standard, 7 a code decoding / descramble processing unit as a data reproduction processing unit, 8 a video reproduction processing unit, 9 an effect control signal reception processing unit, 10 descrambling It is a scramble cancellation permission determination processing unit as permission determination means.

Reference numeral 11 is a scrambler as a scrambler, which comprises an effect control signal generation processor 1 and a scrambler 2. Reference numeral 12 denotes a descrambling device that constitutes a reproduction processing means, and includes an effect control signal reception processing unit 3, a descrambling processing unit 4, and a scramble cancellation permission determination processing unit 5. Thirteen
Is a scramble signal reproducing device which constitutes a reproducing processing means together with the descrambling device 12, and includes a code decoding / descramble processing unit 7, an effect control signal reception processing unit 9, a scramble release permission determination processing unit 10 and a video reproduction processing unit 8. It has and.

The operation of the scramble transmission apparatus of this embodiment having the above configuration will be described below.
First, the operation of the scrambler 11 will be described.

Here, the transmitted data is video signal data (video data) in conformity with the MPEG standard.
The video data is input to the scrambler 11 as input data.
It is input to the inside scramble processing unit 2 and scrambled. FIG. 3 is a configuration diagram of the scramble processing unit 2. In FIG. 3, 14 is a scramble position detecting unit, and 1
Reference numeral 5 is a random number generator, and 16 is an exclusive OR circuit. The input data is input to the scramble position detection unit 14 and the exclusive OR circuit 16. Scramble position detector 14
Reads each code in the bitstream and
A sign bit indicating whether the _coefficient code is positive or negative is detected, and a scramble timing signal is sent to the random number generator 15. The random number generator 15 generates a random number sequence on the basis of the scramble key, one bit each time the scramble timing signal is received, and outputs it to the exclusive OR circuit 16, and when the scramble timing signal is not input, The value 0 is output. Exclusive OR circuit 16
Then, DCT_coefficient in the transmission data
A random number is exclusive-ORed with the sign bit of the code to generate a scrambled signal. Further, the scramble position detection unit 14 reads the value of q_scale and sends the minimum value read so far to the effect control signal generation processing unit 1. In the effect control signal generation processing unit 1, the scramble effect control selection signal and q_sc from the scramble processing unit 2 are sent.
Ale minimum value is received, a scramble effect control signal is generated, and scramble information is generated together with a scramble key. FIG. 4 is an explanatory diagram of scramble information signals. That is, the effect control signal generation processing unit 1 generates an effect control flag and a set value for each mode. The effect control flag is a 3-bit signal and the least significant bit is q_scal.
2 indicates that effect control for setting e is performed, the second bit indicates effect control for setting quantizer_matrix, and the most significant bit indicates effect control for performing binarization processing. After the effect control flag, The set values are shown in order. The effect control selection signal is the mosaic processing-1, mosaic processing-2, harmonic emphasis processing, and binarization processing 4
Effect control signal generation processing unit 1 as a signal indicating one mode
Is input to In mosaic processing-1, q_scale
The flag indicating the effect control is set to 1, and the set value of q_scale is set to 1. At that time, q from the scramble processing unit 2
If the _scale minimum value signal is 5 or less,
Quantization matrix effect control flag is set to 1 and qua
A pattern in which all the values other than the 1st row and 1st column component of nizer_matrix are 1 is set. In the mosaic processing-2, the quantization matrix effect control flag is set to 1, the 1st row and 1st column component is set to 8, the value of the 1st row and 2nd column component is set to 255, and all other components are set to 1. In the harmonic enhancement processing, the flag indicating the q_scale effect control is set to 1 and
The set value of q_scale is set to 63. In the case of the binarization processing effect control, the flag indicating the binarization processing is set to 1 and its set value is set at random. The scramble key is encrypted and transmitted. The encryption means can be performed by a known means for encrypting data. And
In the scramble information, it is expressed together with the scramble key decryption key number code indicating which key can be used to decrypt the encrypted scramble key. Then, a recognition code indicating that these signals are scrambled signals is arranged at the head of 24 bits to be scramble-related information.

Through the above processing, the scrambler 1
In 1, a scramble signal, a scramble key and a scramble effect control signal are generated. The generated signal is
It is transmitted to the descramble device 12 or the scramble signal reproducing device 13 of the reproducing processing means on the receiving side. As a transmission method at this time, a known method such as radio wave transmission or wired transmission can be used. Also, each signal may be multiplexed and transmitted, or may be transmitted by different means.

Next, the descrambling device 1 in FIG.
2 and reproduction of transmission data by the video decoder 6 will be described. In the descrambler 12, the effect control signal is transmitted to the effect control signal reception processing section 3, the scramble signal is transmitted to the descramble processing section 4, and the scramble key information is transmitted to the scramble release permission determination processing section 5. The scramble release permission determination processing unit 5 stores some keys for decrypting the encrypted scramble key. Next, the decryption key number code of the sent scramble key is read, and when the key indicated by that number is stored, the scramble key is decrypted assuming that the descramble permission is given, and sent to the descramble processing unit 4. . When the key of the scramble key decryption number is not stored, it is determined that the scramble release is not permitted, and the scramble release disable signal is sent to the descramble processing unit 4. In the effect control signal reception processing unit 3, q_scale and quantizer_mat
In the case of the rix effect control, the set value is transmitted to the descramble processing unit 4, and in the case of the binarization processing, the set value is output to the external video decoder 6.

FIG. 5 is a block diagram of the descrambling processing unit 4. Reference numeral 17 is a scramble position detecting device, 18 is a buffer for temporarily storing an input signal, 19 is a switch, and 20 is q_scale / equipped with a quantization matrix setting value storage means.
Quantization matrix code output device, 21 is a random number generator,
Reference numerals 22 and 23 are exclusive OR circuits. In the descramble processing unit 4, when the scramble release permission signal from the scramble release permission determination processing unit 5 is permitted, and the scramble key is decrypted and transmitted, the scramble position detection device 17 causes the switch 19 to always store the switch 18 in the buffer 18. A signal to be connected to the output side is sent, and a signal of logical value 0 is always sent to the exclusive OR circuit 22. Then, a sign bit indicating whether the DCT_coefficient is positive or negative in the scramble signal is detected, and the bit is detected by the exclusive OR circuit 2
A scramble timing signal is sent to the random number generator 21 at the timing when the data passes 3. The random number generator 21 outputs a random number by the same generation method as the random number generator 15 of FIG. 3, and when the scramble key is input, the random number generator 1
A random number sequence of the same sequence as 5 is generated. Upon receiving the scramble timing signal from the scramble position detecting device 17, the random number generator 21 sequentially outputs 1 bit in the random number sequence, and the exclusive OR circuit 23 performs an exclusive OR operation on the scramble signal. Therefore, the same value as the scrambled value is subjected to the exclusive OR operation, and the scramble is released. The descrambled signal is input to the video decoder 6 and reproduced. When the scramble cancellation permission signal has a value indicating non-permission, the effect control signal from the effect control signal reception processing unit 3 is received, and q
_Scale and the setting value of the quantization matrix to q_s
Cale / quantization matrix code output device 20 is set. When the least significant bit of the effect control flag is 1, the q_scale signal in the scrambled signal is detected, and the switch 19 outputs a 5-bit section q_scale / quantization matrix code output at the timing when the signal is output from the buffer 18. A signal for connecting to the device 20 side is sent, and a signal indicating q_scale timing is sent to the q_scale / quantization matrix code output device 20. In the q_scale / quantization matrix code output device 20, q previously set according to the signal.
Output the _scale value. Also, the effect control flag 2
When the 1st bit is 1, load_ in the scrambled signal
inra_quantizer_matrix and l
oad_nonintra_quantizer_ma
When each trix is detected and the value is 1, the 512-bit signal from the signal immediately after that is output from the buffer 18 to the switch 19 by q_.
At the same time as sending a signal for connection to the scale / quantization matrix code output device 20 side, a quantization matrix output signal is sent to the q_scale / quantization matrix code output device 20. Also, the load in the scrambled signal
_Inra_quantizer_matrix and load_nonintra_quantizer_m
When the value of atrix is 0, the output of the buffer 18 is stopped in the 512-bit section at the timing when the signal is input to the exclusive OR circuit 22 and the signal immediately after that is output from the buffer 18, and the same as that. At the timing, the quantization matrix output signal is sent to the q_scale / quantization matrix code output device 20. q_scal
Upon receiving the quantization matrix output signal, the e / quantization matrix code output device 20 outputs the previously set quantization matrix value to the switch 19. Random number generator 2
1 always outputs a logical value of 0 except when the scramble timing signal is input. Therefore, when the scramble release permission signal is not permitted, the scramble position detection device 17 does not output the scramble timing signal, and the exclusive OR circuit 23 outputs the output from the exclusive OR circuit 22 as it is, It is output to the video decoder 6. The video decoder 6 reproduces the signal from the descramble processing unit 4, and when the effect control signal reception processing unit 3 receives the binarized signal, the reproduced signal is converted into the binarized signal. Binarization processing is performed according to the set threshold value to obtain a reproduced image.

With the above processing, if the scramble cancellation is permitted, the scramble is canceled and the reproduction processing is performed, and if the scramble cancellation is not permitted, the descrambler 12
The setting value shown in the effect control signal is embedded therein and sent to the video decoder 6 for reproduction.

Next, the operation of the scramble signal reproducing device 13 will be described. Similar to the scramble release permission determination processing unit 5, the scramble release permission determination processing unit 10 stores some keys for decrypting the encrypted scramble key. Next, the sent scramble key decryption key number code is read, and when the key indicated by that number is stored, the scramble key is decrypted assuming that there is scramble cancellation permission, and the code decoding / descramble processing unit 7 Send to. When the scramble key decryption key is not stored, it is determined that the scramble release is not permitted, and the scramble release disable signal is sent to the code decoding / descramble processing unit 7 and the video reproduction processing unit 8. Further, the effect control signal reception processing unit 9 receives the effect control signal and sends the respective set values to the video reproduction processing unit 8. The code decoding / descramble processing unit 7 MPs each code of the scrambled signal.
According to the EG protocol, conversion processing is performed into each value such as DCT coefficient and motion vector. At this time, when the scramble release permission determination signal and the scramble key are received from the scramble release permission determination processing unit 10, DCT_coeffic
The scrambling process performed on the sign bit of the ient code is released. FIG. 6 shows a configuration of a processing unit that performs a descrambling process in the code decoding / descramble processing unit 7. In FIG. 6, 24 is DCT_co.
A lookup table (LUT) for decoding an efficient code, 25 is a random number generator, and 26 is an exclusive OR circuit as data reproducing means. Here, the look-up table 24 and the random number generator 25 constitute a descrambler. Code decoding /
DCT_coefficie in the descrambling unit 7
The nt code is input to the lookup table 24,
The decryption result is output. At that time, the exclusive OR circuit 26 is arranged at the bit indicating the sign bit indicating positive or negative in the decoding result, and the output of the random number generator 25 is subjected to the exclusive OR operation. The random number generator 25 generates a random number sequence in accordance with the same rules as the random number generator 15, and receives the scramble key to generate the same random number sequence as in the case of the scramble process, and the output thereof is the scramble signal. The scrambling is released by performing an exclusive OR operation on the. The descrambling-decoded decoding result is subjected to processing necessary for reproduction such as inverse DCT conversion in the video reproduction processing unit 8,
It is converted into a signal of each pixel and reproduced. In addition, when the code decoding / descramble processing unit 7 receives a signal indicating that cancellation is not permitted from the scramble cancellation permission determination processing unit 10, MP
According to the EG standard convention, each code is decoded and sent to the video reproduction processing section 8. When the video reproduction processing unit 8 receives the cancellation non-permission signal from the scramble cancellation permission determination processing unit 10, the q_sca from the effect control signal reception processing unit 9 is received.
Each of le, the quantization matrix, and each setting value of the binarization processing is received. When receiving the set values of q_scale and the quantization matrix, the video reproduction processing unit 8 performs the code decoding / descramble processing of the q_scale and the quantization matrix when reproducing the code result from the code decoding / descramble processing unit 7. Regardless of the code result from the unit 7, the reproduction processing is performed assuming that each set value is from the effect control signal reception processing unit 9. When the set value of the binarization process is received, the value of each pixel after the reproduction process is binarized according to the set value.

By the above processing, if the scramble descrambling permission is given, the scramble is descrambling to further reproduce the video, and if the scramble descrambling permission is not permitted,
The scrambled video is reproduced based on the value set according to the effect control signal.

As described above, the operation of the scrambler 11 of this embodiment can generate a signal for scramble effect control for performing two types of mosaic processing and scramble effect control emphasizing harmonics. At this time, in the mosaic processing-1, by setting the value of q_scale to 1 which is the minimum value, the value when dequantizing the AC component of the DCT coefficient is made extremely smaller than the actual value. The AC component in the playback image will be suppressed, and DC
A mosaic scrambled image having the size of a block for performing T can be provided to the reproducing side.

Further, q_scal in the data to be transmitted
The value of e is detected, and the minimum value in the data is 5 or less,
When the value is close to the set value of the scramble effect control, the mosaic effect can be guaranteed by further setting all the values indicating the AC components in the quantization matrix to the minimum values.

Further, in the mosaic processing-2, the size of the mosaic can be changed, and by setting the value of q_scale to the maximum value, the scramble effect control emphasizing the harmonic components can be performed.

Further, since scrambling is performed by exclusive-ORing a random number with the sign bit of the DCT_coefficient code, an illegal decryption attempts the scramble key even if the processing by the effect control signal is eliminated. Unless you find it
Furthermore, in the mosaic processing, the reproduction level of the randomized signal due to scrambling is extremely reduced, so that the discomfort caused by reproducing the randomized signal can be reduced.

The descrambling device 12 of this embodiment is also used.
In the case where descramble processing is not permitted on the descramble processing side, a bit stream having a setting value of scramble effect control is generated by the operation of, so that the video decoder 6 connected thereafter simply generates MPEG standard video data. Even if the reproduction processing is performed, the effect control by q_scale and the quantization matrix can be realized, and regarding the binarization processing, if the binarization processing means is provided after the processing of the video decoder 6, In particular, it is possible to realize the one that reproduces the effect control without using the dedicated video decoder 6.

Further, by the operation of the scramble signal reproducing device 13 of the present embodiment, when the scramble effect control image is reproduced as in the configuration of the descramble processing device 12 and the image decoder 6, each set value of the effect control is set. It is not necessary to regenerate the generated bitstream, which simplifies the processing and also enables the detection processing of each code of the bitstream to be shared between the descrambling processing and the code reproduction. Can be reduced.

In the above embodiment, the effect control modes are set to three modes and the set values for realizing them are set to the specified values. However, other effect control modes are prepared and Each value may be set to an appropriate one.

Also, regarding the method of expressing the effect control signal, in the present embodiment, each set value is expressed as it is, but each set value may be coded into another pattern to be generated.
Further, although the binarization processing is performed as the scramble effect control mode, a multivalued processing may be performed in which a plurality of threshold values are provided and representative values are provided in respective value ranges.

Further, as the scrambler 11, in the present embodiment, the signal conforming to the MPEG standard is constituted as the transmission data, but these processes are incorporated in the device which encodes the video data conforming to the MPEG standard. It may be configured.

Further, although the descrambling device 12 and the scramble signal reproducing device 13 are shown to be provided with the effect control signal reception processing units 3 and 9, when only one effect control process is prepared for operation, The effect control signal reception process may be omitted, and if scrambling cancellation permission is not given, a device may be configured to automatically perform fixed effect control process. In that case, the effect control signal reception processing units 3 and 9 in the present embodiment can be configured by replacing the effect control signal reception processing units 3 and 9 with a set value storage unit that stores a fixed set value of the effect control mode. That is, as an operation, instead of the effect control reception processing units 3 and 9 receiving the effect control signal and outputting the set value, a fixed set value stored in advance may be output.

In this embodiment, the transmission data is MPE.
Although the video signal data conforming to G is used, a specific parameter is set to a certain value or a specific process is performed at the time of reproduction in order to control the scramble effect even when transmitting audio data or other data. By specifying that, the scramble effect control can be realized similarly. Further, in the present embodiment, the transmission data is agitated and the scramble effect control signal is further generated. However, only the scramble effect control signal is generated, and the reproduction side determines that the scramble effect permission signal is not permitted. In this case, if the reproduction process is performed in accordance with the scramble effect control signal, the security against illegal decryption is lower than that of the present embodiment, but the device can be simplified without the scramble processing unit.

When such a configuration is installed in a recording device, that is, when outputting data, it is assumed that the scrambler 11 does not have the scramble processing unit 2 and the input data is output as it is, and the data is output. In the case of recording, the scramble release permission determination process in the descrambler 12 is used as a copy permission determination process, and when it is not permitted, the same process as that of the embodiment is performed, and then the data recording means is arranged at the position of the video decoder 6. Then, when the data without the permission of copying is recorded, only the data converted according to the effect control signal can be recorded. Therefore, in an apparatus that only reproduces, the effect control signal is ignored and reproduction processing is performed, and by applying the above processing only to an apparatus that performs recording, it is possible to prevent unauthorized duplication.

[0050]

As described above, according to the present invention, when the signal to be transmitted is scrambled and scrambled, and the scrambled signal is received and reproduced, the receiving side is scrambled as scramble processing. If descrambling of the signal is not permitted, an effect control signal is generated that indicates the playback method on the receiving side, and as the playback process, if the receiving side detects that descrambling is not permitted, scrambling is performed. The reproduced signal can be reproduced based on the effect control signal.

Therefore, the scramble effect control signal intended by the transmitting side can be reproduced even for the receiver who does not permit the descrambling. Further, by mounting these in a transmitting / receiving device for pay broadcasting, access control to data can be performed. Further, by using the scramble effect control signal as a control signal for prohibiting copying, it is possible to prevent illegal copying on a recording medium such as a VTR or a disc.

As a result, it is possible to make the scrambled image in the reproducing apparatus which does not have the descramble permission uncomfortable while maintaining the security against the illegal decoding. Therefore, its practical effect is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a scramble transmission device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a video signal compliant with the MPEG standard used in the embodiment.

FIG. 3 is a configuration diagram of a scramble processing unit of the scramble device of the same embodiment.

FIG. 4 is an explanatory diagram of scramble information generated by the scrambler according to the embodiment.

FIG. 5 is a configuration diagram of a descrambling processing unit of the descrambling device according to the embodiment.

FIG. 6 is a configuration diagram of a code decoding / descramble processing unit of the scramble signal reproducing device according to the embodiment.

FIG. 7 is a block diagram of a conventional scrambler.

[Explanation of symbols]

1 Effect Control Signal Generation Processing Unit 2 Scramble Processing Unit 3, 9 Effect Control Signal Reception Processing Unit 4 Descramble Processing Unit 5, 10 Scrambling Deletion Permission Determination Processing Unit 7 Code Decoding / Descrambling Processing Unit 11 Scrambler Device 12 Descrambler Device 13 Scramble signal reproducing device 20 q_scale / quantization matrix code output device 24 Look-up table 25 Random number generator 26 Exclusive OR circuit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location H04L 9/10 9/12 (72) Inventor Seiji Nakamura 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Within the corporation

Claims (27)

[Claims] 1. A scramble transmission method in which a signal to be transmitted is scrambled, the scrambled signal is received and reproduced, and the scrambled signal is not permitted to be descrambled. To the side, to generate an effect control signal for instructing the reproduction method, as the reproduction processing,
A scramble transmission method for reproducing a scrambled signal based on the effect control signal, when the non-permission of descramble is detected. 2. The scramble transmission method according to claim 1, wherein the transmission data is further scrambled as the scramble processing, and the scramble processing is canceled when the permission of descrambling is detected as the reproduction processing. 3. When the transmitted signal is a video signal conforming to the MPEG standard, and when non-permission of descrambling is detected as a reproduction process, the scrambled signal is converted into a q_scale value of the video signal. The scramble transmission method according to claim 1, wherein the effect control signal is set to a value instructed and reproduced. 4. If the transmitted signal is a video signal compliant with the MPEG standard, and if descrambling non-permission is detected as reproduction processing, the scrambled signal is used as a quantization matrix of the video signal. The scramble transmission method according to claim 1, wherein the value is set to a value indicated by the effect control signal and the reproduction is performed. 5. If the transmitted signal is a video signal that has been orthogonally transformed and coded, and if non-permission of descrambling is detected as reproduction processing, the scrambled signal is used as an instruction for an effect control signal. The scramble transmission method according to claim 1, wherein based on each pixel of the video signal having a pixel value between a predetermined threshold value, the pixel value is converted into each representative value and reproduced. 6. The scramble transmission method according to claim 2, wherein the sign bit of the AC component of the DCT coefficient is inverted as the stirring process. 7. A method of reproducing a scramble signal obtained by scrambling a video signal conforming to the MPEG standard, wherein the q_scale signal is set to a predetermined value regardless of the value in the scramble signal and is reproduced. Scramble signal reproduction method. 8. A method of reproducing a scrambled signal obtained by scrambling a video signal according to the MPEG standard, wherein a quantization matrix is set to a predetermined value regardless of the value in the scrambled signal, and the reproduction processing is performed. Scrambled signal reproduction method. 9. A method of reproducing a scrambled signal obtained by scrambling a video signal conforming to the MPEG standard, wherein a signal having a pixel value of each pixel to be reproduced within a predetermined range is represented by a representative value of each range. A scrambled signal reproducing method for converting into a. 10. A scrambler comprising effect control signal generation means for generating an effect control signal for instructing a reproduction method to a receiving side which does not permit descramble of a scrambled signal. 11. The scrambler according to claim 10, further comprising a stirring processing unit for stirring the transmission data. 12. The scrambler according to claim 10, wherein the effect control signal generating means is configured to generate a signal that defines an inverse quantization process when reproducing the data. 13. The transmission data is a video signal compliant with the MPEG standard, and the effect control signal generating means is q_sc.
A scrambler according to claim 12, configured to generate an ale value. 14. The scrambler according to claim 12, wherein the transmission data is a video signal conforming to the MPEG standard, and the effect control signal generating means is configured to generate a quantization matrix value. 15. The transmission data is a video signal conforming to the MPEG standard, and the effect control signal generating means is configured to generate a threshold value for multi-value processing.
The scrambler described in. 16. A dequantization process in a scrambled signal, comprising scramble cancellation permission determination means and conversion means, wherein the conversion means determines that the scramble cancellation permission determination means does not permit scramble cancellation. A descrambling device configured to convert a signal defining the signal into a predetermined value. 17. A scramble signal obtained by scrambling a video signal conforming to the MPEG standard is input,
17. The descrambling device according to claim 16, wherein the converting means is configured to convert the q_scale value into a preset value when the scrambling cancellation permission judging means judges that the scrambling cancellation is not permitted. 18. An effect control signal receiving means for receiving an effect control signal is provided, and a converting means is provided for q_scale based on the effect control signal received by the effect control signal receiving means.
18. The descrambling device according to claim 17, configured to set a value. 19. A q storing a set value of q_scale.
_Scale setting value storage means, the conversion means, q_
18. The descrambling device according to claim 17, wherein the scale value is set to the set value of q_scale stored in the q_scale set value storage means. 20. A scramble signal obtained by scrambling a video signal conforming to the MPEG standard is input,
17. The descrambling device according to claim 16, wherein the conversion means is configured to convert the quantization matrix signal into a preset value when the scramble release permission determination means determines that the scramble release is not permitted. 21. An effect control signal receiving means for receiving an effect control signal is provided, and the converting means is configured to set a quantization matrix value based on the effect control signal received by the effect control signal receiving means. Item 21. The descrambling device according to Item 20. 22. Quantization matrix setting value storage means for storing the setting values of the quantization matrix, comprising:
21. The descrambler according to claim 20, wherein the quantization matrix is configured to be converted into a set value stored in the quantization matrix set value storage means. 23. A scramble descrambling permission judging means and a reproduction processing means are provided, and when the scrambling cancellation permission judging means judges that the scramble cancellation is not permitted, the scrambling is performed without performing the scramble cancellation processing. A scrambled signal reproducing apparatus configured to reproduce a data in a scrambled signal by setting a signal for controlling a reproduction level in the processed signal to a predetermined value. 24. The reproduction processing means comprises a descrambling means and a data reproduction means, wherein the data reproduction means is
When the scramble cancellation permission judging means judges that the scramble cancellation is permitted, the scramble canceling means is configured to reproduce the data in the scrambled signal after the scramble canceling processing, and the scramble cancellation permission judging means is descrambled. If it is determined that the data is not permitted, the data in the scrambled signal is reproduced without using the descrambling process by setting the signal for controlling the reproduction level in the data in the scrambled signal as a predetermined value. 24. The scrambled signal reproducing device according to claim 23, configured to. 25. The input data is a scrambled signal obtained by scrambling a video signal conforming to the MPEG standard, and when the reproduction processing means determines that the scramble release permission determination means does not permit the scramble release, q_
24. The scramble signal reproducing apparatus according to claim 23, wherein the scramble signal reproducing apparatus is configured to perform reproduction processing by setting a scale value to a predetermined value. 26. The input data is a scrambled signal obtained by scrambling a video signal conforming to the MPEG standard, and the reproduction processing means performs quantization when the scramble release permission determining means determines that scramble release is not permitted. 24. The scrambled signal reproducing device according to claim 23, wherein the scrambled signal reproducing device is configured to reproduce the matrix with a predetermined value. 27. The input data is a scramble signal obtained by scrambling a video signal conforming to the MPEG standard, and the reproduction processing means reproduces when the scramble cancellation permission judging means judges that scrambling cancellation is not permitted. 24. The scrambled signal reproducing device according to claim 23, wherein the scrambled signal reproducing device is configured to perform multi-valued processing on pixel values based on a predetermined threshold value.