JPH08331543A - Digital television broadcast system - Google Patents

Abstract

PURPOSE: To view even a scrambled program to a degree of grasping the content of the program without subjecting it to descrambling. CONSTITUTION: An HDTV signal is converted into an encode signal with three stages of resolution by compression layer encoders 12-14, and an MPEG 2 system layer circuit 15 applies hierarchical processing to the signal and the result is broadcast. In the system above, scramble processing circuits 152, 154 in the MPEG 2 system layer circuit 15 apply scrambling to the higher layer encode signal, and descramble processing circuits 332, 334 in the MPEG 2 system layer circuit 133 apply descramble processing to the encode signal scrambled by the receiver side and decoded for display, and the low layer encode signal of SNR hierarchical processing is decoded for display without descramble processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital television broadcasting system which scrambles digital television signals and broadcasts the signals, and more particularly to a pay broadcasting technology.

[0002]

2. Description of the Related Art In recent years, digital signal processing technology for video and audio has made remarkable progress, and along with that, system technology development has been actively carried out in various countries around the world toward the realization of digital television broadcasting and further the integration of broadcasting and communication. Has been done in. Among these, one of the most important technologies is video / audio compression technology.

Regarding compression technology, MPEG, JPE
G, H. 261 was the main place, but ISO / I
EC13818-1 (Moving Picture Coding Experts
Group (ISO / IEC JTC1 / SC29 / WG1
The method proposed in 1)) is being studied for global standardization of broadcasting, communication, and storage media.

[0004] ISO / IEC13818-1 is not only a video compression system, but a part that individually compresses video, audio, and data of a program on the transmitting side to generate / multiplex a bitstream for broadcasting, and a receiver side. The system is also solidified for the specifications of the control part for receiving specified programs.

With the above digital signal processing technology, digital television pay broadcasting has been studied, but the paying technology is the most problematic here. As a conventional technique for dealing with this problem, a scramble system characterized by performing randomization without changing the code length in a compression layer compliant with the MPEG standard has been proposed. However, since MPEG uses variable length quantization, it is very difficult to scramble without changing the code length.

Therefore, Matsushita is a method in which PN is applied to fixed length codes such as the quantization scale and DCT direct current components, and PN is applied to the variable length codes such as motion vectors and DCT alternating current components to the codes in the codebook. Image Research Institute, Denki Sangyo Co., Ltd., became the Institute of Electronics, Information and Communication Engineers, December 1992
Proposing in May.

In the case of this system, when the video that is compressed and decoded without being descrambled is seen, almost no contents can be recognized. Therefore, by distributing the descramble device to the subscriber who paid the fee, the pay broadcasting is realized. be able to.

However, this method has a drawback that it is very difficult to encode and decode. Furthermore, because the program content cannot be recognized without descrambling,
It is difficult to show the program contents to anyone other than the subscribers.

[0009] That is, if the resolution can be provided so that the program content can be understood, the program can be appealed to non-subscribers, and the desire to subscribe can be stimulated by having the program liked. It is considered that such a method that the program content cannot be recognized does not fit the realistic broadcasting service form.

[0010]

As described above, in the digital television broadcasting system, the conventional scrambled broadcasting system is very difficult to encode and decode, and when it is used for paying, it becomes difficult to encode. Almost no content can be seen when viewing the compressed and decoded video without scrambling, so it is difficult to appeal the program to non-subscribers, and it does not lead to motivation to subscribe.

The present invention has been made to solve the above problems, and even when a scrambled program is selected and decoded without descrambling, the program can be viewed to such an extent that the content of the program can be grasped. It is an object to provide a digital television broadcasting system.

[0012]

In order to achieve the above object, the present invention is a digital television broadcasting system for converting a digital television signal into a plurality of encoded signals having different resolutions and broadcasting in a hierarchical manner. And a scramble processing means for scrambling only the encoded signal on the higher layer side of the plurality of encoded signals, and a descramble process for the scrambled encoded signal on the higher layer side provided on the receiving side. And a descramble processing unit for performing a decoding process on the output of the descramble processing unit for an encoded signal on the higher layer side, and a decoding process for the encoded signal on the lower layer side without performing the descrambling process. And

[0013]

In the digital television broadcasting system having the above configuration, only the encoded signal on the higher layer side of the layered encoded signal is scrambled for broadcasting, so that the encoded signal on the higher layer side is received by the receiving side. Although the broadcast service cannot be received without descrambling, the encoded signal on the lower layer side is not scrambled, so that it can be viewed by decoding and the program content can be grasped.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings. (Embodiment 1) FIG. 1 is a block circuit diagram showing the overall configuration of a digital television broadcasting system according to the present invention.
TR indicates a transmitter and RE indicates a receiver.

In the transmitter TR, H is applied to the input terminal 11.
A DTV (High Definition TV) digital video signal (hereinafter referred to as an HDTV signal) is supplied. This signal is an HDTV compression layer encoder (hereinafter, simply H
It will be referred to as a DTV encoder) 12.

The HDTV encoder 12 is specifically constructed as shown in FIG. This configuration is ISO / IE
It is the spatial layering model shown in C13818-2. The input HDTV signal is downsampled to 1/2 by the downsampling circuit 121, and an SDTV (Standard Definition TV) compression layer encoder (hereinafter, simply referred to as SDTV encoder) 13 which will be described later.
To the subtractor 123, and the difference from the video signal of one frame before is taken. The calculation result is DCT-transformed by the DCT circuit 124, and then the quantization circuit 1
Quantized by 25. The quantized video signal is variable-length coded by the variable-length coding circuit 1213, and then M
Packetization circuit 15 of PEG2 system layer circuit 15
Sent to 1.

On the other hand, the video signal quantized by the quantization circuit 125 is dequantized by the dequantization circuit 1210,
After inverse DCT conversion by the inverse DCT circuit 1211, it is added with the video signal of one frame before by the adder 1212. The addition result is delayed by one frame in the frame memory 129, multiplied by a predetermined coefficient in the multiplier 128, and then supplied to the adder 127.

On the other hand, the HDTV encoder 12 has S
A video signal compressed by the DTV encoder 13 (hereinafter referred to as SDTV compressed signal) is supplied. This S
The DTV compressed signal is upsampled by the upsampling circuit 122 by a factor of 2, and then multiplied by a predetermined coefficient by a multiplier 126 and supplied to the adder 127. The addition result of the adder 127 is sent to the subtractor 123 and the adder 1212 as a video signal of one frame before.

Here, the coefficients given to the multipliers 126 and 128 are set to 1 in total, and at the same time, the output of the subtractor 123 is set to be the smallest. In this way, spatial hierarchy is performed.

Next, the lower layer will be described with reference to FIG. FIG. 3 shows an SNR layered model defined in ISO / IEC13818-2, which is based on the SDTV encoder 13 and LDTV (Low Definition T).
V) It corresponds to a compression layer encoder (hereinafter, simply referred to as an LDTV encoder) 14.

In FIG. 3, first, the SDTV signal obtained by the HDTV encoder 12 is input to the motion vector detection circuit 131 of the SDTV encoder 13 and the subtractor 141 of the LDTV encoder 14.

In the SDTV encoder 13, the motion vector detection circuit 131 simultaneously inputs the video signals delayed by one frame in the frame memory 132 to detect the motion vector, and the motion vector detection signal is sent to the motion compensation circuit 133. To be The motion compensation circuit 133 simultaneously inputs the video signal delayed by one frame from the frame memory 132 and performs motion compensation according to the motion vector detection signal.

The motion-compensated video signal is sent to the subtractor 141 of the LDTV encoder 14 via the switch circuit 134. The switch circuit 134 is normally set to the ON state, and the SDT from the HDTV encoder 12 is
When the V signal is intra-frame coded, it is controlled to be turned off.

In the LDTV encoder 14, the subtractor 141 obtains a difference value between the current SDTV signal from the HDTV encoder 12 and the motion-compensated video signal of one frame before from the SDTV encoder 13 (in the case of intra-frame coding, Outputs the current SDTV signal as it is).

This difference value is DCT-transformed by the DCT circuit 142, roughly quantized by the coarse quantization circuit 143, variable-length coded by the variable-length coding circuit 144, and LDTV.
The compressed signal is sent to the packetizing circuit 153 of the MPEG2 system layer circuit 15. The output of the coarse quantization circuit 143 is also supplied to the SDTV encoder 13.

In the SDTV encoder 13, the coarse inverse quantization circuit 135 performs inverse coarse quantization on the coarse quantized signal from the LDTV encoder 14, and its output is supplied to the subtractor 136 and the adder 137.

The subtractor 136 subtracts the coarse inverse-quantized signal obtained by the coarse inverse quantization circuit 135 from the current signal obtained by the DCT 142 and including the high-precision information before coarse quantization, so that only the high-precision information is obtained. To extract. The high-definition signal thus obtained is quantized by the high-definition quantization circuit 138, variable-length coded by the variable-length coding circuit 139, and the packetization circuit 152 of the MPEG2 system layer circuit 15 as an SDTV compressed signal. Sent to.

The output of the high-definition quantization circuit 138 is dequantized by the high-definition dequantization circuit 1310 and added to the adder 13.
Sent to 7. This adder 137 is a coarse inverse quantization circuit 13
Inverse coarse quantized signal obtained in 5 and high definition inverse quantization circuit 13
The high-definition dequantized signal obtained in 10 is added, and the addition result is subjected to the inverse DCT conversion in the inverse DCT circuit 1311 and input to the adder 1312.

The adder 1312 adds the motion-compensated video signal of one frame before to the inverse DCT conversion output when the switch circuit 134 is in the ON state (other than when the video signal of one frame before is intra-frame coding). The addition output is input to the frame memory 132. The frame memory 132 delays the input video signal by one frame, and its output is supplied to the motion vector detection circuit 131 and the motion compensation circuit 133 as described above.
At the same time, it is sent to the HDTV encoder 12.

HDTV, SDTV, L with the above configuration
The encoder outputs of the DTV are packetized circuits 151, 153, 1 of the MPEG2 system layer circuit 15, respectively.
It is packetized by 55. At this time, in the packet circuits 151, 153, and 155, in order to distinguish the packet signals, the packet ID (Identi
fier) is attached.

The HDTV packet signal and the SDTV packet signal output from the packetizing circuits 151 and 153 are scrambled by the scramble processing circuits 152 and 154, respectively, and then the LDTV packet signal (scramble processing) output from the packetizing circuit 155. (Not performed) and time-multiplexed by a multiplexing circuit (MPX) 156, and SNR (Signal Noise Ratio) layer coding is performed. This multiplexed output is subjected to FEC processing as an MPEG2 system layer processing output by a FEC (Forward Error Correction) encoder 16 and modulated by a modulator 17 to be a broadcast output.

Next, when the receiver RE receives the transmission signal from the transmitter TR, this reception signal is demodulated by the demodulation circuit 3
1, the FEC decoder 32 performs the FEC decoding process, and the MPEG2 system layer circuit 33
Is input to

In the MPEG2 system layer circuit 33, the demultiplexing circuit (DEMAX) 331 demultiplexes the input time-division signal based on the packet ID attached on the transmitting side. The HDTV packet signal and the SDTV packet signal (the high-frequency signal (SNR layer-encoded high-frequency signal (low-layer signal in the case of spatial layering)) separated here are descrambled by descrambling processing circuits 332 and 334, respectively, and then depacketized. The circuit 333 restores the HDTV compressed signal and the SDTV compressed signal, and the HDTV compressed layer decoder (hereinafter simply referred to as HDTV decoder) 36 and the SDTV compressed layer decoder (hereinafter simply referred to as SDTV decoder) via the switch circuits 34 and 35, respectively. ) 37.

Here, the switch circuits 34 and 35 are turned on only when reception of the HDTV signal and the SDTV signal is permitted, respectively. Also, the LDTV packet signal (low-frequency signal (SNR layer-encoded low-band signal (high-layer signal in spatial layering)) separated by the demultiplexing circuit 331 is directly input to the depacketizing circuit 336 and depacketized into an LDTV compressed signal. It This LDTV compressed signal is LD
It is sent to a TV compression layer decoder (hereinafter, simply referred to as an LDTV decoder) 38.

The compressed signals of the respective layers obtained in this way are transmitted to the corresponding decoders 36, 37, 3 of the respective layers.
8 is input. 4 and 5 show specific configurations of the decoders of the respective layers.

First, FIG. 4 shows the LDTV decoder 38 of FIG.
The SNR hierarchical decoding will be described by showing a specific configuration of a portion corresponding to the SDTV decoder 37. LD
In the TV decoder 38, the depacketizing circuit 3 described above is used.
The LDTV compressed signal (low-frequency component of the spatial layered signal) obtained at 36 is input to the variable length decoding circuit 381 and subjected to decoding processing, and coarse dequantization is performed in the coarse dequantization circuit 382. The output of the inverse quantization circuit 382 is input to the inverse DCT circuit 383. It is also sent to the adder 373 of the SDTV decoder 37.

The inverse DCT circuit 383 performs an inverse DCT conversion in accordance with the coefficient obtained by the inverse quantization. The converted output is added by the adder 384 to the signal of one frame before and the original LDTV signal is returned. . This LDTV signal is input to the frame memory 386 and subjected to 1-frame delay processing. The output of the frame memory 386 is subjected to motion compensation by a motion compensation circuit 387 according to a motion compensation processing signal (not shown), and an adder 384 via a switch circuit 385.
Is input to

Here, the switch circuit 385 is normally set to the ON state, and when the output signal of the inverse DCT circuit 383 is the intra-frame coded signal, it is controlled to be switched to the OFF state.
The signal obtained from the motion compensation circuit 387 is not applied to the adder 384.

LDTV decoded as described above
The signal is output from the adder 384 to the LDTV display device 41. In the LDTV display device 41, although not shown in detail, the horizontal pixel thinning circuit and the vertical line thinning circuit perform pixel thinning processing and line thinning processing on the LDTV signal, and unnecessary horizontal and vertical high frequency components by the horizontal and vertical filters. After the removal of the, the SIF resolution (about half of the horizontal and vertical of R601) is displayed.

Next, the structure of the SDTV decoder 37 will be described. When the descrambling is permitted and the switch circuit 35 is set to the ON state, the depacket circuit 335
The SDTV compressed signal (high-frequency component of the spatially layered signal) obtained in step (4) is input to the SDTV decoder 37, decoded by the variable length decoding circuit 371, and then the high-definition dequantization circuit 37.
In step 2, the inverse quantization process is performed and the result is input to the adder 373 and added to the coarsely quantized signal obtained by the LDTV decoder 38.

At this time, when the switch circuit 35 is set to the off state and the SDTV compressed signal cannot be obtained, the output of the adder 373 is only the output of the coarse inverse quantization circuit 382, and only the low frequency component is output. It becomes a signal containing.

The output of the adder 373 thus obtained is subjected to inverse DCT conversion by the inverse DCT circuit 374 and then added with the signal of one frame before by the adder 375 to obtain the original SDT.
Returned to V signal. This SDTV signal is input to the frame memory 377 and subjected to 1-frame delay processing. The output of the frame memory 377 is subjected to motion compensation in accordance with a motion compensation processing signal (not shown) in the motion compensation circuit 378, and is input to the adder 374 via the switch circuit 376.

Here, the switch circuit 376 is normally set to the on state, and when the output signal of the inverse DCT circuit 383 is the intra-frame coded signal, it is controlled to be switched to the off state.
The signal obtained from the motion compensation circuit 378 is not applied to the adder 376.

SDTV decoded as described above
The signal is output from the adder 375 to the SDTV display device 40, and R601 level display is performed. However, when the descramble permission is not obtained, only the SNR hierarchical low-frequency signal is output to the SDTV display device 40.

The output of the frame memory 377 is HDT.
Although it is output to the V decoder 36, if the descramble permission is not obtained, only the SNR hierarchical low frequency signal is output to the HDTV decoder 36.

Next, the structure of the HDTV decoder 36 will be described with reference to FIG. First, when descrambling is permitted and the switch circuit 34 is set to the ON state, the HDTV compressed signal (high frequency component of the spatial layered signal) obtained by the depacket circuit 333 is input to the HDTV decoder 36, and variable length decoding is performed. Decoding processing is performed by the circuit 361. The decoded signal is subjected to inverse quantization processing in the inverse quantization circuit 363, subjected to inverse DCT processing in the inverse DCT circuit 364, then input to the adder 365, and input via the switch circuit 366. It is added to the video signal before the frame.

The video signal one frame before is SDT.
The signal sent from the frame memory 377 of the V decoder 37 is upsampled by the upsampling circuit 362 to double, and the multiplier 367 multiplies the coefficient sent from the transmission side, while the output of the adder 365 is obtained. The frame memory 368 delays one frame, and the motion compensation circuit 3
In 69, motion compensation is performed based on the motion vector signal sent from the transmission side, the multiplier 3610 multiplies the coefficient sent from the transmission side, and the output signals of the multipliers 367 and 3610 are added in the adder 3611. This is the signal obtained by adding.

Here, the switch circuit 366 is normally set to the ON state, and when the signal obtained by the inverse DCT circuit 364 is an intra-frame coded signal, it is controlled to be switched to the OFF state and the signal is supplied to the adder 365. It is designed to shut off.

The HDTV signal (R
The horizontal / vertical signal twice that of 601) is output to and displayed on the HDTV display device 39. At this time, when the descramble circuit 332 cannot obtain the descramble permission and the switch circuit 34 does not supply the signal, the resolution of the HDTV display device 39 remains at about R601, and the descramble circuit 334 further descrambles the signal. When the permission is not obtained and the signal is not supplied from the switch circuit 35, the resolution of the HDTV display device 39 becomes about SIF (half horizontal / vertical resolution of R601).

That is, in the digital television broadcasting system having the above-mentioned configuration, the transmission side performs scramble processing on the high layer encoded signals (HDTV, SDTV) and does not perform scramble processing on the low layer encoded signals (LDTV). On the receiving side, the display can be performed by selectively performing the descrambling process in the high layer signal decoding process, and the display can be performed without the descrambling process in the low layer signal decoding process.

In MPEG, a layer called a system layer is prepared as a layer for multiplexing the above compression layers. In this layer, a flag for paying is prepared, and scrambling can be controlled using the flag. However, if this method is used as it is, even if the scrambled signal is reproduced with the scrambled signal, the content is completely unknown.

Therefore, according to the present invention, the lower layer is not scrambled on the receiving side by the method of scrambling only the upper layer of the layered video included in the system layer protocol and not the lower layer. Normal data can be played back and displayed from the data. However, this video is actually a video with almost no band, and the content is such that it can be confirmed.

Therefore, in the HDTV display device 39, the descramble processing permission is not obtained for both the spatial layered high layer signal and the SNR layered high layer signal (there is no charge contract). Can be confirmed, but only low resolution images can be confirmed for free. If only the high-level signal of the spatial layering is not descrambled and is not supplied, R601
An image with a degree of resolution will be obtained.

Further, as an applied system, in the case of a receiver capable of decoding processing of all layers, the decoding processing of each compression layer must be performed as shown in FIG. The signal can be displayed. Therefore, if the above-described display processing on the LDTV is performed, the HDTV as shown in FIG.
It is possible to display an unscrambled screen with a screen size of about 1/16 of the screen. Similarly, SDTV descrambling is permitted, and if possible, it has a resolution of about R601 with a screen size of about 1/4 of the screen of HDTV as shown in FIG. 6 (b). It is also possible to display another screen on the HDTV screen. It should be noted that the method of hierarchical encoding processing on the transmitter TR side is not limited to the above-mentioned embodiment, and it goes without saying that another method may be used.

[0055]

As described above, according to the present invention, even when a scrambled program is selected and decoded without descrambling, the digital television can be viewed to such an extent that the content of the program can be grasped. A broadcasting system can be provided.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration of an embodiment of a digital television broadcasting system according to the present invention.

FIG. 2 is a block circuit diagram showing a specific configuration of an HDTV compression layer encoder that performs a spatial layering process of the embodiment.

FIG. 3 is an SDTV that performs SNR layering processing of the same embodiment.
3 is a block circuit diagram showing a specific configuration of an LDTV compression layer encoder. FIG.

FIG. 4 is an SDTV that performs SNR layering processing of the same embodiment.
3 is a block circuit diagram showing a specific configuration of an LDTV compression layer decoder. FIG.

FIG. 5 is a block circuit diagram showing a specific configuration of an HDTV compression layer decoder that performs a spatial layering process of the embodiment.

FIG. 6 is an HDT of the same embodiment when descrambling is not permitted.
It is a figure which shows the example of V display.

[Explanation of symbols]

11 ... HDTV signal input terminal, 12 ... HDTV compression layer encoder, 121 ... Down-sampling circuit, 122 ...
Upsampling circuit, 123 ... Subtractor, 124 ... DCT
Circuit, 125 ... Quantization circuit, 126 ... Multiplier, 127 ...
Adder, 128 ... Multiplier, 129 ... Frame memory, 1
210 ... Inverse quantization circuit, 1211 ... Inverse DCT circuit, 12
12 ... Adder, 1213 ... Variable length coding circuit, 13 ... S
DTV compression layer encoder, 131 ... Motion vector detection circuit, 132 ... Frame memory, 133 ... Motion compensation circuit, 134 ... Switch circuit, 135 ... Coarse dequantization circuit,
136 ... Subtractor, 137 ... Adder, 138 ... High-definition quantization circuit, 139 ... Variable-length coding circuit, 1310 ... High-definition dequantization circuit, 1311 ... Inverse DCT circuit, 1312 ... Adder, 14 ... LDTV compression Layer encoder, 141 ...
Subtractor, 142 ... DCT circuit, 143 ... Coarse quantization circuit,
144 ... Variable length coding circuit, 15 ... MPEG2 system layer circuit, 151, 153, 155 ... Packetization circuit, 152, 154 ... Scramble processing circuit, 156 ...
Multiplexing circuit (MPX), 16 ... FEC encoder 17 ... Modulator 31 ... Demodulation circuit 32 ... FEC decoder 33 ... MPEG2 system layer circuit, 331 ... Multiplexing / separating circuit (DEMAX), 332, 334 ... Descramble circuit, 333 335 ... 336 ... Depacketization circuit, 34, 35 ... Switch circuit, 36 ... HDTV compression layer decoder, 361 ... Variable length decoding circuit, 362 ... Upsampling circuit, 363 ... Dequantization circuit, 364 ... Inverse D
CT circuit, 365 ... Adder, 366 ... Switch circuit, 3
67 ... Multiplier, 368 ... Frame memory, 369 ... Motion compensation circuit, 3610 ... Multiplier, 3611 ... Adder, 37
SDTV compression layer decoder, 371 variable length decoding circuit, 372 high definition inverse quantization circuit, 373 adder, 3
74 ... Inverse DCT circuit, 375 ... Adder, 376 ... Switch circuit, 377 ... Frame memory, 378 ... Motion compensation circuit, 38 ... LDTV compression layer decoder, 381 ... Variable length decoding circuit, 382 ... Coarse dequantization circuit, 383 … Inverse DC
T circuit, 384 ... Adder, 385 ... Switch circuit, 38
6 ... Frame memory, 387 ... Motion compensation circuit, 39 ... H
DTV display device, 40 ... SDTV display device, 41 ... LD
TV display device.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H04N 5/455 H04N 7/133 Z 7/015 7/30

Claims (19)

[Claims] 1. In a digital television broadcasting system for converting a digital television signal into a plurality of encoded signals having different resolutions and layering and broadcasting, a digital signal is provided on a transmitting side, and a higher layer side of the plurality of encoded signals is provided. Scramble processing means for performing scrambling processing only on the encoded signal of the above and descrambling processing means provided on the receiving side for performing descramble processing on the scrambled encoded signal on the higher layer side. A digital television broadcasting system characterized in that the output of the descramble processing means is decoded for a signal, and the encoded signal on the lower hierarchy side is decoded without being descrambled. 2. A transmitter of a digital television broadcasting system, which converts a digital television signal into a plurality of encoded signals having different resolutions and broadcasts in a layered manner, wherein the encoded signal on the higher layer side among the plurality of encoded signals. A transmitter for a digital television broadcasting system, characterized in that it comprises scrambling means for performing scrambling only on (1), and does not scramble the encoded signal on the lower hierarchy side. 3. In a receiver of a digital television broadcasting system for converting a digital television signal into a plurality of encoded signals having different resolutions, and layering and broadcasting the encoded signal, a higher layer side encoded signal scrambled on the transmitting side. Is provided with a descramble processing means for performing descrambling processing only, and the output of the descramble processing means is decoded for the encoded signal on the higher layer side, and the decoded signal for the encoded signal on the lower layer side is processed without descramble processing. A receiver for a digital television broadcasting system, characterized in that. 4. The low-layer encoded signal is decoded only when display permission of the higher-layer television signal scrambled on the transmitting side has not been obtained. Receiver of the digital television broadcasting system of. 5. The digital television according to claim 4, further comprising up-sampling means for up-sampling the low hierarchy television signal obtained by the decoding process, and the output of this means is used for display output. Receiver of broadcasting system. 6. A down-sampling means for down-sampling a low-layer television signal obtained by the decoding process is further provided, and the output of this means is used as a display output and is displayed on a part of the display screen. The receiver of the digital television broadcasting system according to claim 4. 7. The receiving apparatus for a digital television broadcasting system according to claim 4, wherein the low-layer television signal obtained by the decoding process is output as it is and is displayed on a part of the display screen. 8. An ISO / IEC13818-1 (Mov
ing Picture Coding Expert
s Group (ISO / IEC JTC1 / SC29
/ WG11)) and the spatial layering and SNR layering proposed in 3
In a digital television broadcasting system that converts into an encoded signal having a step resolution and broadcasts in a layered manner, at least one of a spatial layered encoded signal which is provided on the transmitting side and has the highest layer and an SNR layered high layered encoded signal. Scramble processing means for performing scramble processing on only one side, and descramble processing means provided on the receiving side for performing descramble processing on the scrambled signal of the spatial layer encoded signal and the SNR layered higher layer encoded signal. A high-layer side encoded signal which has been subjected to scramble processing, decodes the output of the descramble processing means, and has a high-layer side encoded signal which has not been subjected to scramble processing and an SNR layered low layer encoded signal. Descramble for signals Digital television broadcasting system, characterized in that the decoding process without processing. 9. ISO / IEC13818-1 (Mov
ing Picture Coding Expert
s Group (ISO / IEC JTC1 / SC29
/ WG11)) and the spatial layering and SNR layering proposed in 3
In a transmitting device of a digital television broadcasting system that converts into an encoded signal having a step resolution and broadcasts in a layered manner, at least one of a spatial layered encoded signal that is the highest layer and an SNR layered high layered encoded signal is used. A transmitter for a digital television broadcasting system, comprising scramble processing means for performing scramble processing, wherein at least SNR hierarchical lower layer encoded signals are not subjected to scramble processing. 10. ISO / IEC 13818-1 (Mo
Ving Picture Coding Exper
ts Group (ISO / IEC JTC1 / SC2
9 / WG11)) proposed spatial layering and SNR
Combined with layering, a digital television signal is converted into an encoded signal having three levels of resolution, and in a receiver of a digital television broadcasting system for layering and broadcasting, the spatial layered encoded signal and SNR layering are the highest layers. Of the high-layer encoded signals of, the descramble processing means for performing descramble processing only on the signal scrambled on the transmitting side is provided, and the scramble-processed higher-layer encoded signal is output from the descramble processing means. Receiver for a digital television broadcasting system, characterized in that a high-layer-side encoded signal not subjected to scrambling processing and a SNR-layered low-layer encoded signal are decoded without being descrambled. . 11. If the display permission of the spatial layered high layer encoded signal and the SNR layered high layer encoded signal scrambled by the transmitting side is not obtained,
11. The receiving apparatus of the digital television broadcasting system according to claim 10, wherein at least only the SNR hierarchical low hierarchy encoded signal is decoded. 12. If the display permission of the spatially layered high layer encoded signal scrambled at the transmitting side is not obtained, the SNR layered high layer and low layer encoded signals are both decoded and combined. 11. The receiving device of the digital television broadcasting system according to claim 10, wherein the receiving device outputs the information as a display output. 13. The digital television broadcasting system according to claim 11, further comprising up-sampling means for up-sampling the SNR hierarchical low-hierarchy television signal obtained by said decoding processing, and the output of this means is used for display output. Receiver. 14. An up-sampling means for synthesizing and up-sampling SNR hierarchized high-layer and low-layer television signals obtained by the decoding process, and the output of this means is used as a display output.
A receiver for the digital television broadcasting system described. 15. The apparatus further comprises downsampling means for downsampling the SNR hierarchical low hierarchy encoded signal obtained by the decoding processing, wherein the output of this means is used as a display output and is displayed on a part of the display screen. The receiver of the digital television broadcasting system according to claim 11. 16. The SN obtained by the decoding process
13. The digital television broadcast according to claim 12, wherein the R-layered high-layer and low-layer television signals are combined and directly output as a display without being upsampled or downsampled and displayed on a part of the display screen. The receiver of the system. 17. A digital television broadcasting system for converting a digital television signal into a plurality of encoded signals having different resolutions, and layering and broadcasting the same, wherein the transmitting side has a higher hierarchical side among the plurality of encoded signals. The scramble processing is applied only to the encoded signal of, the descramble processing is applied to the scrambled encoded signal of the higher layer on the receiving side, and the descramble processing output is decoded for the encoded signal of the higher layer. A transmission / reception method for a digital television broadcasting system, characterized in that the encoded signal on the layer side is decoded without being descrambled. 18. Used in a digital television broadcasting system for converting a digital television signal into a plurality of encoded signals having different resolutions, and layering and broadcasting the encoded signal. A transmission method for a digital television broadcasting system, in which only the scramble processing is performed, and the encoded signal on the lower hierarchy side is not scrambled. 19. A high-layer side encoded signal used in a digital television broadcasting system for converting a digital television signal into a plurality of encoded signals having different resolutions and layering and broadcasting, and scrambled at a transmitting side. A digital television characterized in that only the descramble processing is performed, the descramble processing output is decoded for the higher layer side encoded signal, and the lower layer side encoded signal is decoded without being descrambled. Receiving method of broadcasting system.