JPH02128589A - Multiplex transmission system and equipment and system therefor - Google Patents

Abstract

PURPOSE:To simplify the joint receiving system of a charged telecast utilizing a satellite by multiplexing descramble information upon either video signals or sound signals on a transmitting or receiving side and transmitting the video and sound signals after applying the same scramble to the video and sound signals and synthesizing the signals. CONSTITUTION:Sound signals inputted from a terminal 3 are inputted to a sound scrambler 8 after a keyword from a keyword generating section 5 is multiplexed upon the sound signals at a keyword multiplexing section 6. The scrambler 8 scrambles the sound signals based on a scramble code from the section 5. Video signals inputted from a terminal 2, on the other hand, are scrambled by means of a video scrambler 7 based on the scramble code from the section 5. The scrambled sound and video signals are outputted to a scramble signal output terminal 4 after the signals are synthesized at a synthesizing section 9. Since the same scramble code is used in such way, constitutions of the scramblers 7 and 8 on the transmitting side and a video and sound de-scramblers 16 and 17 on a receiving side can be simplified and a high- secrecy joint receiving system can be constituted to a charged telecast terminal subscribers.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a multiplex transmission system, and is particularly suitable for a pay TV broadcast system using a broadcasting satellite or a communication satellite, or a joint reception distribution system for pay TV broadcasting. The present invention relates to a multiplex transmission method and devices and systems therefor.

[Conventional technology]

Previously, the paid system for satellite broadcasting was introduced in October 1982.
As shown in pages 196 to 200 of "Revised Basic Knowledge of Broadcasting Satellites" published by Kenrokukan Publishing Co., Ltd. on January 1, the video signal and audio signal are scrambled and broadcast. On the receiving side, there are methods of restoring the signal by operating a descrambler in each home using a magnetic card or IC card on which descramble information is recorded, and a method of restoring the signal using pit stream output.

Regarding the conventional video signal scrambling method, as described in Japanese Patent Application Laid-open No. 153441/1982, the video signal is A/D converted on the transmitting side and then scrambled and D/A is applied.
The video signal is converted and transmitted, and the receiving side converts the received signal into A/
There is a method of obtaining a restored video signal by performing D conversion, descrambling, and D/A conversion.

Regarding the conventional joint reception system for satellite broadcasting,
As shown on pages 190 to 196 of "Revised Basic Knowledge of Broadcasting Satellites" published by Kenrokukan Publishing Co., Ltd. on October 1, 1999, satellite broadcast reception signals are demodulated and terrestrial broadcasting is performed. There is a method in which the re-modulated signal is re-modulated into the same signal format as the VHF band and UHF band, and then the re-modulated signal is put into an empty channel in the VHF band and UHF band and distributed to each home.

Regarding scrambling of PCM audio signals of conventional satellite broadcasting, see the appendix of "Satellite Broadcasting Receiver Part 1 Target Ratings" in Part 1 of the Satellite Broadcasting Reception Technology Investigation Committee Report published by the Radio Technology Association in June 1988. Bit interleave scrambling as shown in Figures 8 through 12 is currently used in satellite broadcasting.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not consider a simple scrambling method and a simple transmission method for video and audio signals of pay TV broadcasting using broadcasting satellites and communication satellites, and a joint reception system for pay TV broadcasting. First, there is the problem that there is no simple scrambling method or transmission method for video and audio signals that takes joint reception into consideration.Furthermore, in joint reception, each satellite broadcasting station uses different signal transmission methods and scrambling methods. There is a problem that the reception system becomes complicated as each descrambler and signal processing circuit is required, and furthermore, remodulation using vacant channels in the VHF band and UHF band in joint reception makes it difficult to receive high-quality PCM audio in one piece. There is a problem in that there is no bandwidth to put into the channel, and it is not possible to effectively use the band or use high quality audio.

The purpose of the present invention is to solve the above-mentioned problems, to provide various crumple systems and transmission systems for TV broadcasting and pay TV broadcasting using broadcasting satellites and communication satellites, as well as configurations of joint reception systems for these, and to provide simple satellite The goal is to realize a broadcasting system.

[Means to solve the problem]

The above purpose adopts a method in which descramble information (keywords) is multiplexed on either the video or audio signal on the transmission or retransmission side, the video and audio signals are scrambled in the same way, and the two are combined and transmitted. On the receiving side, a multiplex transmission method is used that extracts keywords multiplexed into video or audio signals and descrambles the video and audio signals. A scrambler using the above transmission method that performs unified scrambling after restoration with a unique descrambler or decoder, a remodulation center that remodulates the scrambled signal and distributes it to each home, and the above reception method in each home. This is achieved by configuring a joint reception system using a descrambler using .

[Effect]

The configuration of the scrambler can be simplified because a keyword is multiplexed on either the video or audio signal on the transmission or retransmission side, and the same scramble is applied to the video and audio signals using one scrambling code generated from the keyword. Furthermore, since the receiving side can descramble the video and audio signals by extracting the multiplexed keyword from either the video or audio signal and reproducing one descrambling code, the configuration of the descrambler can be simplified. In addition, in joint reception, the signal is restored by a descrambler and decoder specific to each broadcasting station at the remodulation center, and then scrambled using a scrambler using a unified scrambling method and distributed. Since the video and audio can be restored using one type of descrambler for the subscriber's broadcast, the descrambler in each home can be simplified, and a highly confidential joint reception system can be constructed for those who have not subscribed to pay television.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a multiplex transmission signal generator embodying the present invention. 1 is a multiplex transmission signal generator, 2 is a video signal input terminal, 3 is an audio signal input terminal, 4 is a scramble signal output terminal, and 5 generates descrambling information (keyword) and scrambling code for restoring the received signal. A keyword generator 6 is a keyword multiplexer that multiplexes a keyword onto a video signal or an audio signal, 7 is a video scrambler that scrambles the video signal using the scramble information from the keyword generator 5, and 8 is a scramble code from the keyword generator 5. 9 is an audio scrambler that scrambles the audio signal; and 9 is a synthesis unit that combines the scrambled video signal and the audio signal. Of the figures (c) and (b), those having similar operations are given the same numbers.

The operation shown in (α) in the same figure will be explained. A keyword generating section 5 generates a keyword and a scramble code corresponding to the keyword so that the received signal can be restored only for pay television subscribers. The keyword from the keyword generating section 5 is multiplexed with the audio signal input from the terminal 3 in the keyword multiplexing section 6, and is input into the audio scrambler 8. The audio scrambler 8 scrambles the audio signal based on the scrambling code from the keyword generator 5.

On the other hand, the video signal input from the terminal 2 is scrambled in the video scramble rough based on the scramble code from the keyword generator 5. The scrambled video signal and audio signal are combined by a combining section 9 and output to a scrambled signal output terminal 4.

Next, the operation shown in FIG. 3(b) will be explained. This multiplexes the keywords generated by the keyword generator 5 onto the video signal by the keyword multiplexer 6, and otherwise operates in the same manner as in FIG. 2(a).

As described above, according to this embodiment, it is possible to multiplex one piece of descrambling information onto either a video signal or an audio signal, and to scramble the video and audio signals with one scrambling code for that keyword. This has the effect of simplifying the configuration of the scrambler on the transmitting side of standard TV broadcasting, and makes it possible to scramble both video and audio signals.

FIG. 2 is a block diagram showing the configuration of a multiplex transmission signal reproducing apparatus embodying the present invention. 10 is a receiving side descrambler, 11 is a received signal input terminal, 12 is a restored video signal output terminal, 13 is a restored audio signal output terminal, 14 is a separation circuit that separates the video signal and audio signal from the received signal, and 15 is a A keyword reproduction section extracts and reproduces the multiplexed keywords, a video descrambler 16 restores a video signal based on the reproduced keywords, and an audio descrambler 17 restores an audio signal based on the reproduced keywords. Of the figures (α) and (b), those having similar operations are given the same numbers.

The operation in the same figure (CL) will be explained. This embodiment is a block diagram showing the configuration of a descrambler on the receiving side when a keyword is multiplexed with an audio signal and transmitted. Terminal 11
The received signal inputted to the is separated into a video signal and an audio signal by a separation circuit 14, and a keyword reproducing unit 15 extracts the multiplexed keyword from the audio signal and reproduces a descrambling code. A descramble code is sent to the rambler 17, the video descrambler 16 descrambles the video signal using the descramble code, the video signal is restored and output to the original signal, and the audio descrambler 17 descrambles the audio signal using the descramble code. It operates to restore and output the audio signal to the original signal, and outputs the restored video signal to the terminal 12 and the restored audio signal to the terminal 13.

Next, the operation shown in FIG. 3(b) will be explained. This embodiment is a block diagram showing the configuration of a descrambler on the receiving side when keywords are multiplexed on a video signal and transmitted, and a keyword reproducing unit 15 extracts keywords from the video signal and reproduces a descramble code. The signal is operated to be sent to the video descrambler 16 and the audio descrambler 17, and the restored video signal output is obtained from the terminal 12 and the restored audio signal output is obtained from the terminal 13, as shown in FIG.

As described above, according to this embodiment, a video signal and an audio signal can be restored using a descramble code extracted and reproduced from one keyword multiplexed in either the video signal or the audio signal, and This has the effect of simplifying the configuration of the receiving side descrambler for standard TV broadcasting.
It enables restoration of both video and audio signals.

FIG. 3 is a block diagram showing the configuration of a multiplex transmission signal generator according to an embodiment of the present invention, which implements the multiplex transmission system of the present invention. 18 is an A/D converter for A/D converting an analog input video signal; 19 beams P and F;

21 is a time-base compression circuit for time-base compression of video signal data, 23 is a time-base compression circuit for time-base compression of audio signal data, 24 is a roll-off filter, and 25 is a video signal data and audio signal. A synthesizer for time-division multiplexing data, 26 beams, P and F, a digital filter having characteristics, 27 a D/A converter for D/A converting the time-division multiplexed video and audio data, 28 beams, P, F. Components in the figure that have the same operational functions as those in FIG. 1 are given the same numbers.

The video signal input from terminal 2 is an analog video signal such as an NTSC signal, and the audio signal input from terminal 3 is a PC signal.
This is an M-encoded digital audio signal. terminal 2
The input analog video signal is converted into a digital video signal by an A/D converter 18, and is converted into a digital video signal by a digital filter 19 that has L, P, and F characteristics and passes only the video signal band (first band). The limited signal is subjected to time-base compression in the time-base compression circuit 21 and input to the synthesizer 25 .

- The digital audio signal input from the right terminal 3 is time-domain compressed by the time-domain compression circuit 23, and input to the synthesizer 25 through a roll-off filter 24 that rolls off the audio signal in a second band in which the time-domain is compressed. . The video signal and audio signal input to the synthesizer 25 are time-division multiplexed and synthesized in the synthesizer 25, and the band is limited so that only the band (third band) of the time-axis compressed video and audio signals passes through. The band is limited by the digital filter 26, and the D/
The signal is converted into an analog signal by the A converter 27 and passed through the third band, and the video and audio signals are time-division multiplexed to the terminal 4 through P, F, and 28, and the analog signal is output.

If this embodiment is applied to broadcasting using satellites, video and audio signals can be time-division multiplexed and transmitted.
As in broadcasting (frequency division multiplex transmission), when the C/N is low, the audio deteriorates first and is muted, leaving only the video.In contrast, in time division multiplex transmission, the video deteriorates first and the audio is muted, just like in terrestrial broadcasting. It is possible to realize the habitual phenomenon that .

FIG. 4 is a block diagram showing the configuration of a multiplex transmission signal reproducing apparatus according to an embodiment of the present invention, which implements the multiplex transmission system of the present invention.

In Fig. 4, 11 is a terminal for inputting the received signal;
4 is a separation unit that separates the video and audio signals from the input signal;
31 is an A/D converter for A/D converting the separated video signal, 32 is a time axis expansion circuit for time axis expansion of the digital video signal, and 34 is a circuit for determining whether the separated audio signal is higher or lower than a certain threshold value. 35 is a clock regeneration circuit for regenerating a clock for determining the transmission rate of digital audio in transmission and borrowing from the separated audio signal; 36; 2 is a time-base expansion circuit for time-base expansion of a digital audio signal, and the same reference numerals are given to components that operate in the same way as in FIG. 2.

The operation will be explained below. The signal input to the terminal 11 is a signal received from a transmission signal generated by the multiplex transmission signal generator shown in FIG. 3, and is a signal obtained by time-division multiplexing of video and audio signals. The signal input to the terminal 11 is separated into a video and audio signal by the separation unit 14, and the video signal is converted into a digital signal by the A/D converter 31, and the time axis is expanded by the time axis expansion circuit #It32 to restore the original signal band. (the first band) is returned to the video signal and output to the terminal 12, while the separated audio signal is output to the code discrimination circuit 34.
is input to the clock recovery circuit 35. Since the audio signal is originally sent by D/A converting the digital signal, the basic clock is regenerated in the clock regeneration circuit 35, and the level is compared to see if it is above or below a certain threshold voltage at that timing, and the logic LL I is performed. The sign of I+ or logic "0" is determined and converted into a digital audio signal.

This audio signal is subjected to time-axis expansion in a time-axis expansion circuit 36 and outputted back to the terminal 13 as the original signal.

According to this embodiment, a broadcasting receiver using a satellite can be constructed, and the same effects as the embodiment shown in FIG. 3 can be obtained.

FIG. 5 is a block diagram showing the configuration of a multiplex transmission signal generator according to an embodiment of the present invention, which implements the multiplex transmission system of the present invention. The embodiment shown in FIG. 5 will be described below.

In the figure, 20 is a scrambler that scrambles the video signal, 22 is a scrambler that scrambles the audio signal, and 2
9 is a clock generation circuit that generates a master clock; 30
This is a multiplication circuit that multiplies the master clock generated by the multiplier clock generation circuit 29, and those that operate in the same way as in FIGS. 1 and 3 are given the same numbers.

The operation will be explained below.

The signal input from terminal 2 is an analog video signal such as an NTSC signal, and the audio signal input from terminal 3 is a PCM encoded digital audio signal. The keywords generated from the keyword generation section 5 are transferred to the keyword multiplexing section 6.
It multiplexes it with the voice signal, generates a scrambling code for the keyword, and sends the scrambling code to the scramblers 20 and 22. The analog video signal input from the terminal 2 is converted into a digital video signal by the A/D converter 18, and the digital filter 1 has L, P, F characteristics and passes only the video signal band (first band).
9, and is scrambled by the scrambler 20 using the scramble code from the keyword generator 5. On the other hand, the digital audio signal inputted from the terminal 3 is multiplexed with keywords by the keyword multiplexing section 6, and then scrambled by the scrambler 22 using the scrambling code from the keyword generating section 5. The scrambled video signal and audio signal are time-domain compressed in time-domain compression circuits 21 and 23, respectively, and the video signal is sent to a synthesizer 25, and the audio signal is rolled off through a second band in which the audio signal is time-domain compressed. The signal is inputted through a filter 24 to a synthesizer 25, where the angle is 44 degrees.

Both signals are time multiplexed. The time-division multiplexed composite signal is band-limited so that only the third band of the time-axis compressed video and audio signals passes, or is band-limited by a digital filter 26 with P, F characteristics, and the composite signal is
/A converter 27 converts it into an analog signal, and further converts it into an analog signal.
The signal is outputted to the terminal 4 by passing the band, or by limiting the band by P, F, and 28.

FIG. 6 is a signal diagram showing an example of an output signal of the multiplex transmission signal generator of FIG. 5. Figure 6 (α) shows the composite signal obtained by time-division multiplexing the time-base compressed audio and video signals in the order of audio and video by not applying time-base compression or scrambling to the synchronization signal of the NTSG video signal. This is an example. In this case, terminal 2 in FIG. 5 has no synchronizing signal.
This can be realized by inputting a TSC analog video signal and time-division multiplexing the video and audio signals on a synchronization signal with the same synchronization pulse interval as the time axis compressed by the synthesizer 25.
If an NTSC analog video signal with a synchronization signal is input to the NTSC analog video signal, this can be achieved by operating the scrambler 20 to stop scrambling during the synchronization period. 6th
The example of the composite signal shown in FIG. 3B is one in which video and audio are time-division multiplexed in the order of time-division multiplexing in a synthesizer 25 that can be realized in the same manner as in the same figure. Figures 6(c) and 6(d) are examples of composite signals in which the synchronization signal is also scrambled;
(c) is an example in which audio and video are time-division multiplexed in the order, and (d) in the figure is an example in which the video and audio are time-division multiplexed in that order.

FIG. 7 is a signal band diagram showing the occupied frequency bands of the input and output composite signals of the multiplex transmission signal generator of FIG. 5;
Figure 7 (α) shows the NTSC video signal band of the BS;
b) represents the band of a PCM audio signal in the BS format, and (c) of the same figure represents an example of the signal band of the composite signal. Here the seventh
Suppose that video and audio signals having video signal bands and audio bands currently used in satellite broadcasting as shown in FIGS. (c) and (b) are input to the multiplex transmission signal generator shown in FIG. In FIG. 5, a clock generation circuit 29 generates a master clock CLK of 2.048 MHz corresponding to the transmission rate of BS audio, and a multiplier circuit 30 generates a first clock of 16.38 MHz, which is the master clock multiplied by eight times.
clock CLKI and 8,192M multiplied by 4 times.
7 second clock CLK2 and 10 multiplied by 5
．． The third clock of 24 MHz, CL K3, and the fourth clock of 20.48 MI (z) multiplied by 10 times
K4 is generated.

As shown in FIG. 5, the scrambler 22 is connected to CLK, A/
D converter 18 is CLKI, digital filter 19 and scrambler 20 are CLK2, time axis compression circuits 21 and 2
3, roll-off filter 24, and digital filter 26
is driven by CLK3, and the D/A converter 27 is driven by C and LK4 clocks, respectively. Further, the keyword multiplexing section 6 multiplexes the keyword, which is descramble information, onto the independent data of the BS audio. Figure 7 (α) input to terminal 2
The video signal in the band is A/D converted by the A/D converter 18 using the clock of CLKI, and the digital filter 19 operating on CLK2 cuts off at the frequency of 172 of CLK2 and has P, F characteristics. Band-limiting the video signal, C
The time axis compression circuit z1, which scrambles with the scrambler 20 operating on LK2 and compresses the time axis to 475, operates on CLK3.

The input audio signal is a BS format PCM audio signal with a transmission rate of 2.048 MHz, and keywords are multiplexed in the independent data area in the keyword multiplexing section 6, and the scrambler 24 operates with the master clock CLK.
The time axis compression circuit 23 that compresses the time axis to 115 uses CLK
The roll-off filter 24 is also a digital filter and operates at CLK3.

The video signal and audio signal obtained in this way are time-division multiplexed by a synthesizer 25, and a digital filter 26 operates on CLK3.
Bandwidth is limited so that only the necessary band, that is, the band shown in FIG. 7(Q), is passed. By compressing the time axis of the video signal to 415 and the audio signal to 115 in this way, the video and audio signals can be included in one horizontal synchronization period as shown in FIGS. 6(α) and (b).

As described above, this embodiment has the same effects as the embodiment shown in FIG. 3, and furthermore, since the keyword is multiplexed with the independent data of the BS format audio signal, the configuration of the apparatus is easy. Furthermore, in the current frequency division multiplexing system like BS broadcasting, the audio signal used to multiplex keywords deteriorates first when the input C/N is low, so the video must be scrambled.

Although the descrambling operation is not guaranteed, since the time division multiplexing method is used as in this embodiment, the video and audio can be sufficiently descrambled using the keyword multiplexed with the audio signal.

Also, the clock given to each component that requires a clock is 1
Since the clock can be generated and configured by multiplying two reference master clocks, the overall configuration can be simplified.

Further, according to this embodiment, NTSC video signals and PCM audio signals can be transmitted in a band of 5.12 MHz.

FIG. 8 is a block diagram showing the configuration of a multiplex transmission signal reproducing apparatus according to an embodiment of the present invention, which implements the multiplex transmission system of the present invention.

In FIG. 8, 37 is a separator that separates a video signal and an audio signal, 38 is a keyword extractor that extracts a keyword multiplexed into an audio signal, and 39 is a reproducing code for descrambling from the extracted keyword. Components that operate in the same way as the embodiments shown in FIGS. 2 and 4 are given the same numbers. The operation will be explained below.

The signals input from terminal 11 are NTSC video signals and BS
The signal generated by the multiplex transmission signal generator of the embodiment shown in FIG. 5, which time-division multiplexes audio signals of various formats and multiplexes keywords on the independent data of the audio signals and transmits the signals, is transmitted using a broadcasting satellite or a communication satellite. This is the received signal. The signal input to the terminal 11 is separated into a video signal and an audio signal by a separator 37. For example, in the case of a signal as shown in Figure 6 (α), the audio signal is read at the rising edge of the synchronization signal, stored in a storage circuit, etc., the burst signal of the video signal is checked, the video signal is read from that, and the video and audio signals are separated. do.

Further, the video signal that identifies the video signal section and the audio signal section is converted into a digital signal by the A/D converter 31, and the time axis is expanded to 574 by the time axis expansion circuit 32. On the other hand, the separated audio signal is passed through the code discrimination circuit 34 to the fourth
Similar to the embodiment shown in the figure, the signal is converted into a digital audio signal, the time axis is expanded five times by the time axis expansion circuit 36, and the signal is input to the keyword extraction section 38.

The keyword extraction section 38 extracts the multiplexed keyword from the independent data area, sends this keyword to the descramble code reproduction section 39, performs arithmetic processing, etc., and reproduces the descramble code. Video descrambler 16
Then, the transmitted descramble code and video signal are processed and restored to the original video signal, and the audio descrambler 17
Then, the original audio signal is similarly restored using the sent scrambling code.

According to this embodiment, the same effect as that of the embodiment explained in FIG. 4 can be obtained.

FIG. 9 is a block diagram showing the configuration of a multiplex transmission signal generator according to an embodiment of the present invention.

40 is a D/A converter that converts a digital video signal into an analog signal, 41 is a QPSK modulation circuit that QPSK modulates a PCM audio signal, 42 and 43 are modulation circuits, 44 is a 90° phase shifter, 45 is an oscillator, 46 is a VSB filter,
47 is an equalizer circuit having inverse Nyquist characteristics for the correction filter of the VSB filter on the receiving side;
8 is an adder, 49 is an output terminal, and the same numbers are given to components that operate in the same way as in the embodiments shown in FIGS. 1, 3, and 5. The operation will be explained below.

The video signal input to the terminal 2 is A/D converted by an A/D converter 18, passed through a digital filter 19, scrambled by a scrambler 20, and converted into an analog signal by a D/A converter 40. B input to terminal 3
The S format PCM audio signal is sent to the keyword multiplexing section 6.
The keywords generated by the keyword generator 5 are multiplexed into an independent data area, scrambled by a scrambler 22, passed through a roll-off filter, and inputted to a QPSK modulation circuit 41, where they are QPSK-modulated in the same way as in BS broadcasting. .

On the other hand, the oscillation signal oscillated by the oscillator 45 is transmitted to the modulation circuits 42 and 9.
The oscillation signal input to the 0'' phase shifter 44 and the 90'' phase shifter has its phase shifted by 90 degrees and is input to the modulation circuit 43. The video signal converted to an analog signal is sent to the modulation circuit 4.
AM modulated by the oscillation signal input at 2 and VS
The QPSK modulated audio signal is outputted as a residual sideband signal through the B filter 46, and then AM modulated by the 90° phase-shifted oscillation signal inputted to the modulation circuit 43, and the amplitude characteristics are corrected by the equalizer 47, and then output. The modulated double sideband audio signal is orthogonally multiplexed with the orthogonal component of the vestigial sideband video signal in the adder 48 and sent to a terminal 49.
is output to.

According to this embodiment, the band of the QPSK audio signal is 1.024.
M7, the video band is 4.2M7, and orthogonal multiplexing of AM modulation can be used, so signal transmission is possible in the current TV channel and CATV system with a signal transmission band of 6MHz, and high It has the effect of transmitting high-quality PCM audio and scrambling video and audio. Further, a simple configuration is possible as in the embodiment shown in FIG.

FIG. 10 is a block diagram showing the configuration of a multiplex transmission signal reproducing apparatus which is an embodiment of the present invention. The embodiment shown in FIG. 1O will be described below.

In FIG. 10, 50 is an input terminal into which a received signal generated and transmitted by the multiplex transmission signal generator of FIG. 52 is an A/D conversion circuit for A/D converting the detected video signal; 53 is a B, P, F, , 54 is a carrier wave regeneration circuit that extracts and reproduces a carrier wave from the passed audio signal band;
55 is an orthogonal synchronous detection circuit, and 56 is a QPSK demodulation circuit. Among the components of the embodiments shown in FIGS. 2, 4, and 8, those having similar operations are given the same numbers.

The signal input to the terminal 50 is a signal obtained by orthogonally multiplexing an audio signal onto the orthogonal component of an AM-modulated vestigial sideband video signal. One side of the signal input to the terminal 50 is a video signal that is subjected to AM detection in the AM detection circuit 51 and then sent to the A/D converter 5.
After being converted into a digital signal by 2, it is restored to the original video signal by a video descrambler 33, and the other is converted to a 1,024 MHz QPSK signal by B, P, F, 53.
A carrier wave reproducing circuit 54 reproduces an orthogonal carrier wave whose phase differs by 90 degrees from the carrier wave of the image from this signal, and an audio signal is generated from the reproduced carrier wave by a quadrature synchronous detection circuit 55. Perform synchronous detection.

The detected audio signal is a QPSK modulated signal, which is QPSK demodulated in a QPSK demodulation circuit 56 and P
Get commercial audio. The keyword extraction unit 38 extracts keywords from the independent data area of the BS format,
The descramble code reproduction section 39 reproduces the descramble code based on the keyword, and sends the descramble code to the video descrambler 33 and the audio descrambler 37 to restore the video and audio signals, respectively.
and 13.

According to this embodiment, signals transmitted in the current terrestrial TV broadcasting and CATV broadcasting bands can be received and high quality PCM audio can be received, and the descrambling of video and audio signals can be realized with a simple configuration. be.

FIG. 11 is a block diagram illustrating a multiplex transmission signal generating apparatus according to an embodiment of the present invention, showing the keyword multiplexing section 6 in detail in the embodiment of FIG. 1(,). The embodiment shown in FIG. 11 will be described below.

In FIG. 11, 57 is an input terminal for a digital audio signal, 58 is an audio signal output terminal after multiplexing a keyword, 59 is a PCM encoder, 60 is an error correction code addition circuit that generates and multiplexes an error correction code, and 61 is an error correction code addition circuit that generates and multiplexes an error correction code. A keyword adding circuit 62 multiplexes the keyword generated by the keyword generating section 5 onto the PCM audio signal, and an interleaving circuit 62 interleaves the audio signal in the BS format. The operation will be explained below.

PCM encoded by a PCM encoder 59,
An error correction code similar to the error correction code used in BS broadcasting is multiplexed at the same position on the bit interleave matrix in an error correction code addition circuit 60, and a keyword addition circuit 61 converts the keywords generated in the keyword generator 5 into audio signals. It is multiplexed into an independent data area in the BS format, and subjected to known interleaving similar to BS broadcasting in an interleaving circuit 62. Further, the keyword generating section 5 operates to generate a scrambling code for scrambling the video and audio signals corresponding to the keyword. Note that the independent data should not be scrambled.

FIG. 12 is a data layout diagram of the location embodiment of the present invention showing the details of the keywords added to the independent data area. An example of a data arrangement diagram consisting of a key code, which is the information necessary to generate the user code and descrambling code expressed, and allocated to the data 1 independent data. This is an example of a data allocation diagram in which an error correction code containing only keywords is assigned to independent data.

FIG. 13 shows the keyword reproducing unit 1 of the embodiment shown in FIG. 2(a).
FIG. 5 is a block diagram of a multiplex transmission signal reproducing apparatus according to an embodiment of the present invention, showing details of FIG.

In FIG. 13, 63 is an input terminal into which the audio signal separated by the separation unit 14 is input, 64 is an output terminal for the audio signal after keyword extraction, 65 is a deinterleave circuit,
66 is an error correction/interpolation circuit, and 67 is a keyword extraction circuit.

The audio signal input to the terminal 63 is deinterleaved in the same way as a BS receiver, and the deinterleave circuit 65 performs the same error correction/interleaving operation as in the BS receiver. 66, the keyword extraction circuit 67 extracts the independent data on the interleave matrix, and sends the extracted independent data, that is, the keyword, to the descramble code reproducing section 39.

It operates to reproduce the descrambling code from the code.

As described above, according to the implementation of FIGS. 11, 12, and 13,
Keywords can be multiplexed into the independent data area of a PCM audio signal in the BS format, and the sending side can multiplex keywords and the receiving side can extract keywords.
Since this can be carried out using a method similar to that used in S broadcast reception, a simple multiplex transmission signal generation and multiplex transmission signal reproducing device can be constructed.

Furthermore, when a keyword is divided into a user code and a key code and multiplexed into independent data as two pieces of information as shown in FIG. It is possible to make a key code for unscrambling correspond to each other, and it is possible to send different key codes to many recipients, which has the effect of increasing confidentiality. In addition, for those who have not paid their reception fee, we will provide them with a random key code, and by adding an error correction code for the keyword, we will prevent the keyword from being damaged due to disturbances that occur in the transmission system. Confidentiality in the method.

This has the effect of increasing reliability.

FIG. 14 is a block diagram of a multiplex transmission signal generating apparatus according to an embodiment of the present invention, showing in detail the keyword generating section 5 of the embodiment of FIG.

68 is a user code generation circuit that generates a user code that is unique to each receiver; 69 is a video scrambler 7;
, and a scramble code generation circuit that generates a scramble code to be sent to the audio scrambler 8; 70 is an arithmetic circuit;
1 is a keyword synthesis circuit for synthesizing a user code and a key code, 72 is a keyword output terminal, and 73 is a scramble code output terminal.

A user code generation circuit 68 generates a user code for each person who desires to receive pay broadcasting. Further, a scrambling code generation circuit 69 generates a certain scrambling code. When a certain user code is generated in the user code generation circuit 68, the user code and a certain scrambling code are subjected to certain arithmetic processing in the arithmetic circuit 70, a key code is generated and output, and the user code and the arithmetic operation are performed. The key code output from the circuit 70 is synthesized by a keyword synthesis circuit 71 and outputted to a terminal 72 as a keyword. Further, the scramble code generated by the scramble code generation circuit 69 is output to the terminal 73. Further, the user code is changed and the keyword output at that time is similarly outputted to the terminal 72, thereby sending the keyword to each person desiring to receive pay broadcasting. Furthermore, the output of the arithmetic circuit 7o, that is, the key code, is output as a random code to those who have not paid the fee for the paid broadcast, thereby preventing unfair reception of the pay broadcast.

According to this embodiment, a key code is generated by a certain calculation process using a large number of user codes and a certain scrambling code, so a large number of keywords can be created, and each recipient has one
Since the present invention can be operated to give two key codes, it is possible to configure a multiplex transmission signal generating device that has high confidentiality and can reliably send information in a descrambleable manner to those who have not paid their paid broadcast license fees.

FIG. 15 is a data arrangement diagram showing temporal changes in the relationship between keywords multiplexed to independent data and scrambling codes for scrambling video and audio signals according to an embodiment of the present invention.

In the keyword generating section 5 shown in FIG. 14, if the scrambling code generating circuit 69 generates the scrambling code S□ and scrambles the video and audio signals during a certain time period, the user code generating circuit 68 generates the scrambling code S□ from the user code U1 during this period. U. The key codes output from the arithmetic circuit 70 are from □ to K.
The keywords are generated as data up to n, and the keywords are synthesized by the keyword synthesis circuit 71 as shown in FIG. When the user code has been generated up to trn, the user code is generated again from Ul and keywords are generated in the same manner.

When a certain program ends and the next program starts in pay broadcasting, the scramble code is changed from 81 to 82 at certain time intervals.

Each key code can then be changed from its previous state.

According to this embodiment, each key code can be changed by changing the scrambling code at a certain time interval, so that confidentiality can be further improved.

In addition, by updating the scramble code for each program, a reception fee can be collected from those who wish to receive pay broadcasting for each program, giving broadcasters a variety of fee collection methods, and allowing receivers to avoid paying fees for broadcasts they do not want to watch. This has the effect of configuring a toll collection mechanism that does not need to be used.

FIGS. 16, 17, and 18 are block diagrams of a multiplex transmission signal generator according to an embodiment of the present invention, showing the arithmetic circuit 70 in more detail in the embodiment of FIG. 14.

74 is a FOR circuit that exclusively ORs two input signals;
Reference numeral 74 denotes a ROM which outputs its contents by specifying an address with an input signal, and components that operate in the same way as the components of the embodiment shown in FIG. 14 are given the same numbers.

In the embodiment shown in FIG. 16, the user code generated by the user code generation circuit 68 and the scramble code generated by the scramble code generation circuit 69 are exclusive-ORed by the FOR circuit 74, and the output is inputted to the ROM 75 as an address. The content is output as a key code and the rest operates in the same manner as the embodiment shown in FIG.

In the embodiment shown in FIG. 17, the user code is input to the ROM 75, and the contents of the ROM 75 and the scrambling code are
The circuit 75 operates to perform exclusive OR to generate a key code.

In the embodiment shown in FIG. 18, the scramble code is input to the ROM 75, and the contents of the ROM 2S and the user code are exclusively ORed in the FOR circuit 74 to generate a key code.

The embodiments shown in FIGS. 16, 17, and 18 have the same effect as the embodiment shown in FIG. 14, and the method of changing the scrambling code over time as shown in FIG. For example, the same effect as that described in the embodiment of FIG. 15 can be obtained.

FIG. 19 is a block diagram of the keyword extraction transmission signal generator in the embodiment of FIG. 13.

In FIG. 19, 76 is an input terminal to which the received and separated PCM audio is de-interleaved, error-corrected and interpolated audio signals are input, 77 is an output terminal to which the descrambling code is output, and 78 is the BS A key code extraction circuit extracts a keyword from independent data of a format audio signal, and extracts a key code corresponding to a user code that matches a specified user code, 79 is a unique user given to a person who wishes to receive pay broadcasting. This is a user code storage circuit that stores codes. Further, 39 is a descramble code reproducing section.

The signal input from the terminal 76 is sent to the key code extraction circuit 78.
, a keyword is extracted from the independent data area, a user code specific to the receiving side stored in the user code storage circuit 79 is read out, a user code that matches this user code is selected from the extracted keywords, and the user code corresponding to the user code is selected. Extract the key code and send it to the descramble code reproduction $39. The descramble code reproducing unit 39 operates to input the extracted key code and the stored user code, reproduce a descramble code from these, and output it to the terminal 77.

According to this embodiment, it is possible to reproduce the descramble code from the signal generated and transmitted by the multiplex transmission signal generator of the embodiment shown in FIG. There is.

20, 21, and 22 show a multiplex transmission signal reproducing apparatus according to an embodiment of the present invention in which the descramble code reproducing section 39 of the embodiment shown in FIG. This corresponds to the transmitter-side multiplex transmission signal generator shown in FIGS. 17 and 18.

In Figures 20, 21, and 22, 80 is a ROM
, 81 is an FO that performs exclusive OR of two input signals.
Components of the R circuit that operate in the same way as the components of the embodiment shown in FIG. 19 are given the same numbers.

In the embodiment shown in FIG. 20, the extracted key code is input to the ROM 80 as an address and stored as its contents. Early
The code is subjected to exclusive OR in a FOR circuit 81 and a descramble code is outputted to a terminal 77.

In the embodiment shown in FIG. 21, the stored user code is input to the ROM 80 as an address, and the contents and the extracted key code are exclusively ORed in the FOR circuit 81, and the obtained descramble code is output to the terminal 77.

In the embodiment shown in FIG. 22, the extracted key code and the stored user code are exclusively ORed in the FOR circuit 81, the result is inputted as an address to the ROM 80, and the contents are outputted to the terminal 77 as a descramble code.

According to the embodiments shown in FIGS. 20, 21, and 22,
There is an effect similar to that of the embodiment shown in FIG. 19.

FIG. 23 is a block diagram of a multiplex transmission signal generator according to an embodiment of the present invention, showing in detail the keyword generator 5 of the embodiment of FIG. 1.

In FIG. 23, 82 is a random code generation circuit that generates random codes, and components that operate in the same way as in the embodiment of FIG. 14 are given the same numbers. The operation will be explained below.

A random code generation circuit 82 generates a random code, a scramble code generation circuit 69 generates a certain scramble code, and a user code generation circuit 68 generates a certain scramble code.
generates a user code in the same manner as the embodiment shown in FIG. 14, and processes these three codes, the random code, the scramble code, and the user code, through the arithmetic port N70, and outputs one key code. This key code and user code are combined in a keyword synthesis circuit 71, and a keyword is output to a terminal 72 and a scramble code is output to a terminal 73.

According to this embodiment, a key code can be generated from three codes: a user code, a scramble code, and a random code, and a multiplexed transmission signal with higher secrecy than the embodiment shown in FIG. 14 can be generated. By applying this embodiment, it is possible to generate a multiplexed transmission signal with higher secrecy.

FIG. 24 is a block diagram of a multiplexed transmission signal reproducing apparatus according to an embodiment of the invention by Ann Beak, in which the keyword extraction circuit 67 and the descramble code reproducing section 39 of the embodiment of FIG. 13 are shown in detail. This corresponds to the multiple transmission signal reproducing device on the receiving side for the embodiment shown in FIG.

In FIG. 24, 83 is a receiving side random code generation circuit corresponding to the random code generation circuit 82 in FIG.
23 is an arithmetic circuit that performs an inverse operation corresponding to the arithmetic circuit 70 in FIG. 23, and components that operate in the same manner as in FIG. 19 are given the same numbers. The operation will be explained below.

The embodiment shown in FIG. 24 uses an extracted key code similar to the embodiment shown in FIG. The arithmetic circuit 84 operates to perform an inverse arithmetic operation to that of the arithmetic port N70 in FIG.

As described above, according to this embodiment, the signal generated by the multiplex transmission signal generator shown in FIG. 23 can be received and regenerated, and highly confidential transmission and reception can be realized.

FIG. 25(α) is a block diagram of the key word main transmission signal generator of the embodiment shown in FIG.
FIG. 4 is a block diagram of a multiplex transmission signal reproducing apparatus according to an embodiment of the present invention, showing in detail the keyword extracting circuit 67 and the descramble code reproducing section 39 of the embodiment of FIG. 3;

In FIG. 25, 85 is a key code generation circuit, 86 is a scramble pattern generator that selects one of a plurality of scramble patterns and generates it [1° 112 is a circuit that inputs the extracted key code as an address and descrambles its contents. This is a ROM that is output as a code, and components that operate in the same way as in FIGS. 13 and 14 are given the same numbers.

In FIG. 25 (α), one scramble pattern is selected and generated in the scramble pattern generation circuit 86. The scrambling code generation circuit 69 generates a scrambling code according to the selected scrambling pattern and outputs it to a terminal 73. Further, the user code generation circuit 68 generates each user code in the same way as in the embodiment shown in FIG.
5, and the key code generation circuit 85 generates a key code uniquely determined by the scramble pattern and the user code.

For example, FIG. 26 is a diagram showing a matrix for determining the key code Kxv based on the scramble pattern Sx and the user code Uy.
Such a matrix is stored in a storage circuit or the like, and a key code is determined and generated from the input scramble pattern and user code. The key code and user code generated in this manner are combined in the Keylard synthesis circuit 71 and operated to be outputted to the terminal 72 as a keyword.

FIG. 25(b) shows, as in the embodiment of FIG. 19, a key code is extracted using a user code unique to a receiver, a receiving device, or a certain receiving device and a certain channel, and the extracted key code is used as an address. A descramble code reproducing unit 39 is configured by a ROM 112 that uses data for an address as a descramble code, and an output terminal 77
It operates to output a descramble code.

According to this embodiment, the key code generation circuit 85 has a built-in matrix as shown in FIG. Also the 25th
It is possible to prevent an accurate descrambling code from being generated at the output terminal 77 in FIG. 7(b), thereby preventing improper reception. In addition, by changing the scramble pattern at certain time intervals to increase confidentiality, or by changing the scramble pattern for each program to update the key code, it is possible to collect paid broadcast license fees for each program, allowing for a variety of fee collection methods. It has the effect of

FIG. 27 is a block diagram showing the configuration of a joint reception system for television broadcasting using broadcasting satellites (BS) and communication satellites (CS) according to an embodiment of the present invention.

In FIG. 27, 87 is an antenna for receiving BSTV broadcasts and multiple CS broadcasts, 88 is a B5-C5 converter that converts the RF received signal into the first IF signal, 89 is a remodulation center in joint reception, and 90 is each A receiver representing each receiving terminal in the home; 91 is a tuning/demodulation circuit that tunes and selects a desired signal from the input first IF signal, demodulates the FM, and outputs a baseband signal; A restoration circuit that restores the scrambled and transmitted signal using a unique method, 93 a scrambling device that re-scrambles the restored baseband signal using a common reception unified scrambling method, and 94 a scrambler that re-scrambles the signal. A remodulation unit that remodulates the baseband signal of each channel into a certain frequency band; 95 is a distribution unit that distributes the remodulated signal to be sent to each terminal in each home; 96 is a tuning unit that performs tuning tuning for each terminal; 97 is a descrambling device for unscrambling common reception, 98 is a video output terminal, 9
9 is an audio output terminal.

The operation will be explained below.

TV broadcasts using broadcasting satellites or communication satellites can be transmitted using a paid system that is scrambled unique to the broadcasting station, normal BS broadcasting, or high-definition broadcasting. TV broadcast waves transmitted from broadcasting satellites and communication satellites are FM modulated waves in the 12 GHz band and are transmitted as circularly polarized waves, vertically polarized waves, and horizontally polarized waves, and the TV broadcast waves transmitted from each satellite are A B5-C5 converter 8 receives each 120H7 band RF signal with an antenna 87 composed of a parabolic antenna, a planar antenna, etc., and converts the frequency of each 120H7 band RF signal into a first IF signal.
8, the signal is converted into a first IF signal in the IGHz band. The converted 1st F signal is sent to multiple channel selection/demodulation ports I! At a91, the channel of each broadcasting station is selected, the frequency is converted to a second IF signal, FM demodulation is performed, and the baseband signal of each channel is output.

Baseband signals that have undergone signal processing such as scrambling and encoding specific to each broadcasting station are subjected to descrambling and decoding specific to each broadcasting station, and signal processing is performed so that it becomes a normal NTSC video signal or a PCM audio signal of the current BS format. In the restoration circuit 92, each unique baseband signal is restored. Furthermore, the restored signal is scrambled again using the common scrambling method of the joint reception system.The restored signal is again subjected to unified scrambling and signal processing, and then remodulated to VHF-UHF, for example. The signals are re-modulated to a band such as an empty channel or the BS first IF frequency band of the IG& band, frequency multiplexed, and distributed by a distribution section 95 to a receiver 90 that is a receiving terminal in each home.

The distributed signals are channel-selected by a channel selection section 96 in the receiver 90, and signal processed by a descrambling device 97, and video signals such as normal NTSC and analog and digital audio signals are sent to terminals 98. terminal 9
9 is output. The embodiment shown in FIG. 27 operates as described above.

According to this embodiment, the signal that has been scrambled or encoded unique to each broadcasting station at the remodulation center 89 is subjected to signal processing such as descrambling or decoding unique to each broadcasting station once in the restoration circuit 92 and then restored. By using the scrambling device 93 to perform unified scrambling and signal processing for the joint reception system and distribute the information, the receivers 90 in each home can perform unified signal processing such as descrambling and decoding, and each receiver 90 can perform descrambling and signal processing for the unified reception system. Device 9
7 can be configured as one barrel, the descrambling device 97 can be simplified, and the joint reception system can be prevented from becoming complicated.

In addition, a joint reception system is used as a unit to enter into a reception contract with a pay-TV broadcasting station, and each household wishing to receive pay-TV programs specifies the channels and programs they wish to view and pays the corresponding reception fee.
The remodulation center can control the provision of unscrambled keywords to those who have not paid the license fee, channels, and programs, and if the broadcasting station wants to collect the license fee directly from co-recipients on the side. It is also possible for each broadcasting station to directly control the remodulation center 89, and a joint reception system compatible with pay broadcasting can be constructed.

In addition, when receiving C8 broadcasting using communication satellites in addition to BS broadcasting using broadcasting satellites, the shape of the antenna is too large for each individual to install, making it difficult to install the antenna in urban areas. Although this will hinder the spread of TV broadcasting using BS and C8, mass introduction of the community reception system of this embodiment will also lead to the spread of TV broadcasting using BS and C8, revitalizing the satellite broadcasting market and promoting information transmission. Expansion of means and diversification of information can be promoted.

If the multiplex transmission signal generating device of the embodiment of the present invention of FIG. 3 is applied to the scrambling device 93 in the communal reception system of the embodiment of FIG. 27, the reception fee can be collected only from the receiver itself. It can support broadcasting systems that are free of charge to receivers, such as the current commercial terrestrial broadcasting system, and can simplify the configuration of a community reception system.

Furthermore, if the multiplex transmission signal generator of the embodiment of the present invention shown in FIG. 5 is applied to the scrambling device 93 and AM modulation is performed in the remodulator 94, video and high quality PCM audio can also be transmitted in the MHz band per channel. Furthermore, since the data can be scrambled, a paid TV broadcasting joint reception system can be easily constructed.

Furthermore, if the multiplex transmission signal generating device of this embodiment shown in FIG. 9 is applied to the scrambler 93, it is possible to fit the video signal and high quality PCM audio signal into the 6 MHz transmission band, which is the same as the current transmission band of terrestrial broadcasting and CATV broadcasting. Possible, paid method T
A V broadcast joint reception system can be easily configured, and the oscillation frequency of the oscillator 45 in FIG.
By shifting the frequency by Hz and causing the oscillation, the configuration of the re-modulating section 94 can be simplified by simply combining the respective outputs of the scrambling device 93 in the re-modulating section 94. Among the plurality of scrambling devices 93, some scrambling devices 93 use the multiplex transmission signal generator of the embodiment shown in FIG. 5, some scramble devices 93 use the multiplex transmission signal generator of the embodiment of FIG. The scrambling device 93 can be configured with a combined method using the multiplex transmission signal device of the embodiment shown in FIG. 3, and can be selected appropriately depending on the signal from the broadcasting station or problems with the equipment of the community reception system. Various configurations of the system TV broadcasting joint reception system are possible.

FIG. 28 shows in detail a receiver 90 in a community reception system according to an embodiment of the present invention. In FIG. 101 is a tuner circuit that tunes the desired signal from the input signal and converts the IF signal frequency; 102 is a tuning circuit that selects the desired channel from the input signal; 103 is a demodulation circuit that demodulates the IF multiplied signal and outputs a baseband signal. , 104 is a descrambler configured using the multiplex transmission signal reproducing apparatus shown in the embodiment of FIG. 8, 105 is a video signal processing circuit, 106 is an audio signal processing circuit, and 107 is a first
A descrambler configured using the multiplex transmission signal reproducing device shown in the embodiment shown in FIG. A switch 110 for selectively switching the video signal is a switch for selectively switching the output audio signals of the descramblers 104 and 107, and those having the same operation as in FIG. 27 are given the same numbers. The operation will be explained below.

FIG. 28(α) shows a receiver that receives signals distributed and transmitted when the present transmission signal generator is used in the community reception system of FIG. 27.

The channel selection circuit 102 selects a desired channel from the input re-modulation signal, and the tuner circuit 101 uses the generated tuning voltage.
The tuner circuit 101 performs tuning and frequency conversion to output an IF multiplied signal, and the demodulation circuit 103 demodulates the signal.
Descrambled in a descrambler 104,
The separated video and audio signals are output, subjected to signal processing by a video signal processing circuit 105 and an audio signal processing circuit 106, and then output.

FIG. 28(b) shows a receiver that receives signals distributed and transmitted when the scrambling device 93 is constructed using the multiplex transmission signal generator of the embodiment shown in FIG.

The channel selection circuit 102 selects a desired channel from the input re-modulated signal, and the generated tuning voltage is sent to the tuner circuit 101.
The tuner circuit 101 performs tuning and frequency conversion to output an IF multiplied signal, and the descrambler 107 performs orthogonal detection and descrambling, and similarly performs video signal processing and audio signal processing.

FIG. 28 (,) shows a receiver that receives signals distributed and transmitted in the case where the scrambling device 93 is constructed using the multiplex transmission signal generator of the embodiment shown in FIGS. 5 and 9. Represents the configuration. A channel is similarly selected based on the input re-modulated signal, tuned by the tuner circuit 101, frequency converted, and an IF multiplied signal is output. It is stored in advance whether the channel selected by the channel selection circuit 102 is a channel using a time division multiplex scrambling method as in the embodiment shown in FIG. 5 or a channel using an orthogonal multiplex scrambling method as shown in FIG.
Pass through the descrambler 104 or descrambler 10
Switch 108.1 sends a switching control signal that determines whether
09 and 110, and switches appropriately according to each channel.

As described above, according to this embodiment, in a paid TV broadcasting joint reception system, all channels can be handled by a unified descrambler, so that the receiver configuration can be greatly simplified.

J%, Figure 29 shows a broadcasting satellite (BS) according to an embodiment of the present invention.
1 is a block diagram illustrating the configuration of a joint reception system for television broadcasting using satellites and communication satellites (CS).

113 is a scramble controller that controls the scramble device 93, and components that operate in the same way as in FIG. 27 are given the same numbers. The operation will be explained below.

In FIG. 29, the scrambling controller 113 in the remodulation center 89 allocates user codes among the keywords that are descrambling information to each channel of each receiver, controls the keyword generating section 5 of each scrambling device 93, A random key code is inserted into the receiving channel of the unpaid recipient, and the scramble code is controlled to change over time.

As described above, this embodiment has the same effects as the embodiment shown in FIG. 27, and the user code can be assigned and controlled for each channel of each receiver, making it possible to easily control the system.

FIG. 30 is a block diagram of a receiver 90 according to an embodiment of the present invention, showing in detail the receiver 90 in the joint reception system of FIG. 29 according to an embodiment of the present invention.

In FIG. 30, 111 is a user code control circuit, and components that operate in the same way as in the embodiment of FIG. 28 are given the same numbers. The operation will be explained below.

In FIG. 30, the tuning circuit 102 that has selected a certain channel generates a channel signal that gives the tuning voltage and the number of that channel, and the user code control circuit 11
Send to 1. The user code control circuit 111 takes out the user code of the selected channel of the receiver from the storage section, sends it to the descramblers 104 and 107, and performs control so that a descramble code can be generated. Figure 30 (α).

The other operations in (b) and (Q) are shown in (a) in FIG.

It operates similarly to the embodiments (b) and (Q).

FIG. 31(α) is a block diagram of a joint reception system according to an embodiment of the present invention, showing in detail the relationship between the keyword generator 5 and the scramble controller 113 in the embodiment of FIG. 1, and FIG. 31(b) 13 is a block diagram of a community reception system according to an embodiment of the present invention, showing in detail the relationship between the keyword extraction circuit 67 and the user code control circuit 111 in implementation J of FIG. 13. FIG.

In FIG. 31, components that operate in the same way as in FIGS. 13, 14, 29, and 30 are given the same numbers. The operation will be explained below.

In FIG. 31 (α), the scramble controller 11
3 changes the scrambling code in the scrambling code generating circuit 69 over time and also controls the arithmetic circuit 70 to give a random key code to the user code for which the reception fee has not been paid.

In FIG. 31(b), the user code control circuit 111
operates to identify a designated channel by the channel signal from the channel selection circuit 102, generate a pre-stored user code, and write it into the user code storage circuit 79.

As described above, this embodiment has the same effects as the embodiments shown in FIGS. 29 and 30.

FIG. 32 shows a receiver according to an embodiment of the present invention in which the user code control circuit 111 of the receiver 90 according to the embodiment of the present invention shown in FIG. 30 is shown in more detail.

In FIG. 32, 114 is a removable external storage medium that stores the user code assigned to each channel of each receiver, 115 is a readout circuit that reads the user code from the external storage medium, and 116 is a readout circuit that reads the user code from the external storage medium. A reading circuit 115. reads out the channel signal from the channel selection circuit 102. This is a control circuit that controls the user code storage circuit 79, and components that operate in the same way as in FIG. 19 are given the same numbers. The operation will be explained below.

The control circuit 116 that receives the channel signal from the channel selection circuit 102 is connected to the external storage medium 1 that stores the user code.
The reading circuit 1 reads out the user code from 14.
The reading circuit 115 that controls the 15 and reads out the user code sends the user code to the user storage circuit 79, and the control circuit 116 issues a user code write command to the user code storage circuit 79 and stores the user code in the user code storage circuit 79. Operate as expected.

According to this embodiment, in the user code control circuit 111, a magnetic card, an IC card,
By using external storage media such as ROM cards,
Other receivers 90 can also receive the broadcast, and this card can be issued after collecting a reception fee in place of a reception contract, which has the effect of smoothly operating a joint reception system for paid TV broadcasts.

〔Effect of the invention〕

According to the present invention, there is an effect that a joint reception system for pay TV broadcasting using broadcasting satellites, communication satellites, etc. can be constructed with a simple system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a multiplex transmission signal generating device as an embodiment of the present invention, FIG. 2 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention, and FIG. FIG. 3 is a block diagram of a multiplex transmission signal generating device as an embodiment of the present invention, FIG. 4 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention. A block diagram of a multiplex transmission signal generator as an example, FIG. 6 is a signal diagram of an example of an output transmission signal of the multiplex transmission signal generator of FIG. 5, and FIG. 7 is an input/output of the multiplex transmission signal generator of FIG. 5. A signal band diagram of an example of a signal band, FIG. 8 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention, FIG. 9 is a block diagram of a multiplex transmission signal generator as an embodiment of the present invention, FIG. 1O is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention, FIG. 11 is a block diagram of a multiplex transmission signal generator as an embodiment of the present invention, and FIG. 12 is a block diagram of a multiplex transmission signal generator as an embodiment of the present invention. A data allocation diagram showing a keyword multiplexing system as an embodiment, FIG. 13 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention, and FIG. 14 shows a multiplex transmission signal generation as an embodiment of the present invention. A block diagram of the device, FIG. 15 is a data allocation diagram showing a keyword multiplexing method according to an embodiment of the present invention, FIG. 16 is a block diagram of a multiplex transmission signal generator as an embodiment of the present invention, and FIG. A block diagram of a multiplex transmission signal generator as an embodiment of the present invention, FIG. 18 is a block diagram 1 of a multiplex transmission signal generator as an embodiment of the present invention, and FIG. 19 is a block diagram as an embodiment of the present invention. FIG. 20 is a block diagram of a multiplex transmission signal reproducing apparatus as an embodiment of the present invention, and FIG. 21 is a block diagram of a multiplex transmission signal reproducing apparatus as an embodiment of the present invention. 22 is a block diagram of a multiplex transmission signal generating device as an embodiment of the present invention, FIG. 23 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention, and FIG. 24 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention. FIG. 25 is a block diagram of a multiplex transmission signal reproducing device as an embodiment of the present invention; FIG.
FIG. 6 is a matrix diagram of key codes generated in an embodiment of the present invention, FIG. 27 is a block diagram of a joint reception system as an embodiment of the present invention, and FIG. 28 is a block diagram of a joint reception system as an embodiment of the present invention. A block diagram of a receiver in the reception system, FIG. 29 is a block diagram of a joint reception system as an embodiment of the present invention, FIG. 30 is a block diagram of a receiver in the joint reception system as an embodiment of the present invention, 31st
FIG. 32 is a block diagram of a receiver in a community reception system as an embodiment of the present invention, and FIG. 32 is a block diagram of a receiver in a community reception system as an embodiment of the present invention. 5...Keyword generation section, 6...Keyword multiplexing section, 7...Video scrambler, 8...Audio scrambler, 9...Composition section, 14...Separation section, 1
5... Keyword playback unit, 16... Video descrambler, 17... Audio descrambler, 89... Remodulation center, 93... Scramble device, 97... Descramble device. ~ To the next ~ Kinutai (Arai) Tsumugi

Claims (1)

[Claims] 1. In a system in which a video signal and an audio signal are scrambled and multiplexed transmitted, after key information for unscrambling is multiplexed onto either the video signal or the audio signal to be transmitted. , a multiplex transmission characterized in that both signals including the multiplexed signal are scrambled using the key information, and the scrambled video signal and the scrambled audio signal are combined and transmitted. method. 2. The multiplex transmission system according to claim 1, wherein the scrambled video signal and the scrambled audio signal are synthesized by time division multiplexing. 3. The video signal is an NTSC video signal, the audio signal is a digital PCM audio signal, and a first signal obtained by time-base compression of the scrambled video signal and the scrambled audio signal 3. The multiplex transmission system according to claim 2, wherein the second signal obtained by time-base compressing the second signal is synthesized by time division multiplexing. 4. The scrambled audio signal is QPSK modulated, a carrier wave is provided, and the first signal obtained by amplitude modulating the carrier wave with the scrambled video signal, and an orthogonal carrier wave that is in a quadrature phase relationship with the carrier wave is provided and QPSK is applied. 2. The multiplex transmission system according to claim 1, wherein a second signal obtained by amplitude modulating an orthogonal carrier wave with a modulated audio signal is synthesized. 5. In the television signal transmission system, the first signal obtained by time-base compression of the NTSC video signal component and the second signal obtained by time-base compression of the PCM audio signal, which is digital data, are A multiplex transmission method characterized by combining and transmitting data through division multiplexing. 6. Time-sharing the first signal obtained by time-axis compressing the NTSC video signal component every horizontal synchronization period and the second signal obtained by time-axis compressing the PCM audio signal, which is the digital data. 6. The multiplex transmission system according to claim 5, wherein the multiplexing is performed in one horizontal synchronization period by multiplexing. 7. Time-sharing the first signal obtained by time-axis compressing the NTSC video signal component every horizontal synchronization period and the second signal obtained by time-axis compressing the PCM audio signal, which is the digital data. 6. The multiplex transmission system according to claim 5, wherein the horizontal and vertical synchronization signals are combined with the third signal obtained by multiplexing and combining in one horizontal synchronization period by multiplexing. 8. In a joint reception system that jointly receives pay television broadcasting using broadcasting satellites and communication satellites, the scrambled or encoded signal unique to each broadcasting station is received and the signal is restored to a fixed signal format. Community Reception System A community reception system that uses a unified multiplex transmission method to perform unified scrambling or encoding again, and then transmits the scrambled or encoded data to each receiving terminal. 9. Claim 8, characterized in that the multiplex transmission system for unified reception system is the multiplex transmission system according to claim 1.
Joint reception method described. 10. The joint reception system according to claim 8, wherein the multiplex transmission system unified to the joint reception system is the multiplex transmission system according to claim 2. 11. The joint reception system according to claim 8, wherein the multiplex transmission system unified to the joint reception system is the multiplex transmission system according to claim 3. 12. The joint reception system according to claim 8, wherein the multiplex transmission system unified to the joint reception system is the multiplex transmission system according to claim 4. 13. The joint reception system according to claim 8, wherein the multiplex transmission system unified to the joint reception system is the multiplex transmission system according to claim 5. 14. The joint reception system according to claim 8, wherein the multiplex transmission system unified to the joint reception system is the multiplex transmission system according to claim 6. 15. The joint reception system according to claim 8, wherein the multiplex transmission system unified to the joint reception system is the multiplex transmission system according to claim 7. 16. A keyword generation unit that generates a keyword that is key information for unscrambling and a scramble code for scrambling the video signal and audio signal, and a keyword multiplexing unit that multiplexes the keyword onto the input audio signal and outputs it. , a video scrambler that scrambles the input video signal using the above-mentioned scrambling code and outputs the result, an audio scrambler that scrambles the output signal from the keyword multiplexing section using the above-mentioned scramble code and outputs the result, and an output of the video scrambler and the audio scrambler. 1. A multiplex transmission signal generating device comprising: a combining section that combines outputs of the bras and outputs a combined signal. 17. A keyword generation unit that generates a keyword as key information for unscrambling and a scramble code for scrambling the video signal and audio signal, and a keyword multiplexing unit that multiplexes the keyword onto the input video signal and outputs it. , an audio scrambler that scrambles the input audio signal using the above scramble code and outputs the result, a video scrambler that scrambles the output signal from the keyword multiplexing section using the above scramble code and outputs the result, and an output of the video scrambler and the audio scrambler. 1. A multiplex transmission signal generating device comprising: a combining section that combines outputs of the bras and outputs a combined signal. 18. The video scrambler includes an A/D converter that A/D converts the input analog video signal and outputs a digital video signal, and an A/D converter that inputs the digital video signal and passes only the video signal band. A first digital filter that limits the band; a first scrambler that scrambles and outputs the output of the first digital filter using a scrambling code from the keyword generator; and a time-base compressor that compresses the output of the first scrambler. The audio scrambler scrambles the keyword-multiplexed digital audio signal output from the keyword multiplexing unit using a scrambling code from the keyword generating unit. a second scrambler that outputs a second scrambler; a second time-base compression circuit that compresses the output of the second scrambler and outputs the output; It is configured with a roll-off filter that limits the band so that only the band passes, and the synthesis section time-division multiplexes and synthesizes the output of the first time-base compression circuit and the output of the roll-off filter to generate a synthesized Y signal. a synthesizer for outputting an output; a second digital filter for band-limiting so as to pass only the band of the synthesized signal from the output of the synthesizer; and a D/A converter for D/A converting the output of the second digital filter. 17. The multiplex transmission signal generator according to claim 16, further comprising a low-pass filter that passes only a band of the composite signal from the output of the D/A converter. 19. The video scrambler includes an A/D converter that A/D converts the input analog video signal and outputs a digital video signal, and an A/D converter that inputs the digital video signal and passes only the video signal band. A first digital filter that limits the band; a first scrambler that scrambles and outputs the output of the first digital filter using a scrambling code from the keyword generator; and a D/A converter that outputs the output of the first scrambler. The audio scrambler is configured with a D/A converter for converting the keywords, and the audio scrambler scrambles the keyword-multiplexed digital audio signal output from the keyword multiplexing unit using a scrambling code from the keyword generating unit and outputs the scrambled digital audio signal. 2 scrambler and
The synthesis unit includes a roll-off filter that limits the band so as to pass only the audio signal band from the output of the second scrambler, and a QPSK modulation circuit that QPSK-modulates a signal inputted with the output of the roll-off filter, and the synthesis unit includes: An oscillator that generates an oscillation signal as a carrier wave, a 90° phase shifter that shifts the phase of the oscillation signal from the generator by 90°, and a D/A converter input that inputs the output of the D/A converter and uses it as a modulation signal to output the signal from the oscillator. A first modulation circuit that amplitude modulates the oscillation signal, a second modulation circuit that inputs the output of the QPSK modulation circuit and uses this as a modulation signal to amplitude modulate the oscillation signal that has passed through the 90° phase shifter, and the first modulation circuit. 17. The multiplex transmission signal reproducing apparatus according to claim 16, comprising a circuit and an adder for adding the output signals of the second modulation circuit. 20. The keyword multiplexing section includes a PCM encoder that inputs an audio signal, PCM-encodes the input audio signal, and outputs a PCM digital audio signal, and a PCM encoder that generates an error correction code, adds the error correction code to the PCM digital audio signal, and outputs it. an error correction code addition circuit that multiplexes the keyword from the keyword generation section with the output from the error correction code addition circuit and outputs the same; and an interleaf circuit that interleafs the output of the keyword addition circuit and outputs the resultant. 17. The multiplex transmission signal generating device according to claim 16, characterized in that it is configured by:. 21. The keyword generated in the keyword generation section,
17. The scrambling device according to claim 16, characterized in that it is composed of a user code that is a code assigned to a receiving side that receives the output signal from the multiplex transmission signal generator, and a key code that is a code of key information for unscrambling. Multiplex transmission signal generator. 22. The keyword generated in the keyword generation section is
17. The multiplex transmission signal generating apparatus according to claim 16, comprising the user code, the key code, and an error correction code for correcting errors in the keyword itself. 23. The keyword generation section includes a user code generation circuit that generates a user code, a scramble code generation circuit that generates a scramble code, and a first arithmetic circuit that generates a key code by calculating the generated user code and the scramble code. and a keyword synthesis circuit that synthesizes the key code that is the output of the first arithmetic circuit and the user code generated by the user code generation circuit and outputs it as a keyword. 24. Generating the key code by causing the keyword generation unit to operate the user code generation circuit, the scramble code generation circuit, the random code generation circuit that generates a random code, the user code, the scramble code, and the random code. 17. Multiple transmission signal generation according to claim 16, characterized in that it is constituted by a second arithmetic circuit and a keyword synthesis circuit that synthesizes a key code and a user code that are output from the second arithmetic circuit and outputs the resultant as a keyword. Device. 25. The multiplex transmission signal generating apparatus according to claim 16, wherein the scramble generating circuit changes the generated scrambling code at a certain time interval. 26. The keyword generation section includes a scramble pattern generation circuit that selects a type of scramble code and generates a scramble pattern indicating the type, a scramble code generation circuit that generates a scramble code for the scramble pattern, and the user code generation circuit. , a key code generation circuit that generates a key code from a user code and a scramble pattern from the user code generation circuit, and a keyword synthesis circuit that synthesizes the key code and the user code and outputs a keyword. 17. The multiplex transmission signal generator according to 16. 27. The multiplex transmission signal generation device according to claim 16, wherein the scramble pattern generated by the scramble pattern generation circuit is changed at a certain time interval. 28. The signal input to the video scrambler is NTS
17. The multiplex transmission signal generating apparatus according to claim 16, wherein the multiplex transmission signal generator is a C video signal. 29. An A/D converter that inputs an analog video signal and converts the input video signal into a digital video signal, and a first digital converter that limits the band of the digital video signal so that only the video signal band passes through. a first time-base compression circuit that compresses the time-base of a digital video signal that has passed through the first digital filter and outputs the compressed digital video signal; and a PC.
A second time-base compression circuit that inputs an M digital audio signal, compresses the input audio signal in the time-base, and outputs it; and a band of the audio signal expanded by the time-base compression from the output of the second time-base compression circuit. a roll-off filter that limits the band so as to only pass the signal; a synthesizer that combines the output of the first time-base compression circuit and the output of the roll-off filter by time division multiplexing and outputs a composite signal; and the output of the synthesizer. a second digital filter that limits the band so that only the band of the synthesized signal passes through; a D/A converter that converts the digital synthesized signal to an analog synthesized signal; 1. A multiplex transmission signal generation device comprising a low-pass filter that limits the band so as to pass through the transmission multiplexed signal and outputs the transmission multiplexed signal. 30. A separation unit that separates and outputs a video signal and an audio signal from a received signal, and a descrambling code and audio for extracting and reproducing keywords that are key information for descrambling from the separated audio signal and descrambling. a keyword playback section that outputs a signal; and a video descrambler that inputs the video signal from the separation section, descrambles the video signal using a descrambling code from the keyword playback section, restores the original video signal, and outputs the restored video signal. , characterized in that it is constituted by an audio descrambler that inputs an audio signal from a keyword reproduction unit, descrambles the audio signal with a descramble code from the keyword reproduction unit, restores the original audio signal, and outputs the restored audio signal. Multiplex transmission signal reproducing device. 31. A separation unit that separates and outputs a video signal and an audio signal from a received signal, and a descrambling code and video signal for extracting and reproducing keywords, which are information for descrambling, from the separated video signal and descrambling them. an audio descrambler that receives the audio signal from the separation unit, descrambles the audio signal using a descrambling code from the keyword reproduction unit, restores the original audio signal, and outputs the restored audio signal; A multiplexer comprising a video descrambler that inputs a video signal from a keyword playback section, descrambles the audio signal using a descrambling code from the keyword playback section, restores the original video signal, and outputs the restored video signal. Transmission signal regenerator. 32. The separation unit includes a separator that separates and outputs a video signal and an audio signal from a received signal in which an analog video signal and a digital audio signal are time-division multiplexed, and converts the separated video signal into a digital signal. a first time-axis expansion circuit that expands the time-axis of the video signal converted into a digital signal and outputs the video signal; Sign determination that compares the level of the clock regenerated circuit and the clock regenerated from the separated audio signal to see if the level is higher or lower than a certain threshold value, determines whether it is logic 1 or logic 0, and outputs it as a digital signal. 31. The multiplexed transmission signal reproducing apparatus according to claim 30, comprising: a circuit and a second time-axis expansion circuit for time-axis expansion of a code-identified digital audio signal and outputting the audio signal. 33. The separation unit is configured to perform orthogonal multiplexing by adding and synthesizing the amplitude-modulated video signal carrier wave with an audio signal carrier wave that is amplitude-modulated with a QPSK-modulated audio signal and an orthogonal carrier wave that has an orthogonal phase relationship with the video signal carrier wave. An AM detection circuit inputs a signal, performs AM detection, and outputs a video signal; an A/D converter converts the AM detected video signal into a digital signal and outputs a digital video signal; Synchronization is achieved by a bandpass filter that passes only the band of the carrier signal, a carrier regeneration circuit that extracts and reproduces the carrier wave from the audio carrier signal that is the output of the bandpass filter, and a carrier that reproduces the audio carrier signal that is the output of the bandpass filter. The quadrature synchronous detection circuit detects and outputs the audio signal, and the audio signal output from the quadrature synchronous detection circuit is Q
QPSK demodulates PSK and outputs digital audio signal
Claim 30 characterized in that it is configured by a demodulation circuit.
The multiplex transmission signal reproducing device described above. 34. The keyword reproducing unit includes a keyword extraction unit that extracts the keyword multiplexed into the audio signal from the audio signal separated by the separation unit and outputs the audio signal and the keyword, and a keyword extracted by the keyword extraction unit. 31. The multiplex transmission signal reproducing apparatus according to claim 30, further comprising a descramble code reproducing section for reproducing a descramble code for unscrambling to be sent to the video descrambler and the audio descrambler. 35. The keyword extracting section includes a deinterleave circuit that deinterleaves the digital audio signal separated by the separator, and an error correction interpolation circuit that corrects or interpolates errors in the interleafed digital audio signal. 31. The multiplex transmission signal reproducing apparatus according to claim 30, further comprising: a keyword extraction circuit which extracts the keyword from a digital audio signal output from the error correction interpolation circuit and outputs the keyword and the audio signal. 36. The keyword extraction circuit extracts keywords from the digital audio signal that is the output of the user code storage circuit that stores the user code, which is the code assigned to the receiving side, and the error correction interpolation circuit, and extracts the user code. and a key code extraction circuit that extracts the key code corresponding to the user code from the storage circuit from among the keywords, and is configured to output the keyword separated into the key code and the user code to the scramble code reproducing unit. 31. The multiplex transmission signal reproducing apparatus according to claim 30. 37. The multiplex transmission signal reproducing apparatus according to claim 30, wherein the descramble code reproducing unit is constituted by an arithmetic circuit that calculates the input user code and key code and reproduces and outputs a descramble code. . 38. The descramble code reproducing unit includes a random code generation circuit that generates a random code, and an arithmetic circuit that calculates the generated random code and the input user code and key code to reproduce and output a descramble code. 31. The multiplex transmission signal reproducing apparatus according to claim 30, comprising: 39. The descramble code reproducing unit is constituted by a ROM that stores a descramble code corresponding to the key code from the key code extraction circuit as an address as data, and outputs a descramble code in response to the input key code. Claim 3 characterized in that
The multiplex transmission signal reproducing device according to 0. 40, a separation unit that receives a signal obtained by combining an analog video signal and a PCM digital audio signal by time division multiplexing, and separates the received input signal into a video signal and an audio signal;
A/D converts separated video signals into digital signals
a converter, a first time axis expansion circuit that expands the time axis of the video signal converted into a digital signal, a clock regeneration circuit that reproduces a clock corresponding to the data transmission rate of the audio signal from the separated audio signal, and a first time axis expansion circuit that expands the time axis of the video signal converted to a digital signal; a sign discrimination circuit that compares levels to see if the level is higher or lower than a certain threshold value at the timing of a clock reproduced from the signal, determines whether the signal is a logic 1 or a logic 0, and outputs the signal as a digital signal;
1. A multiplex transmission signal reproducing device comprising: a second time-base expansion circuit for time-axis expansion of a code-identified digital audio signal and outputting an audio signal. 41, one or more antennas that receive television broadcast waves broadcast using broadcasting satellites or communication satellites, and each RF signal received from the antennas
One or more converters convert the frequency into F signals, demodulate each channel from each IF signal, restore the scrambled and decoded signals specific to each broadcasting station, and then perform unified scrambling or encoding again. What is claimed is: 1. A joint reception system comprising a remodulation center that readjusts the signal and distributes the signal to receivers serving as terminals in each household; and receivers serving as terminals in each household. 42. The remodulation center is connected to a plurality of channel selection demodulation circuits that input respective IF signals output from the converter, select and demodulate each channel, and output baseband signals of the respective channels; Multiple restoration circuits input channel baseband signals and restore scrambled and decoded signals unique to each broadcasting station into a unified signal, and the restored signals of each channel are scrambled or encoded to create a unified system. By inputting the output from multiple scrambling devices and each channel's scrambling device,
42. The community reception system according to claim 41, comprising: a remodulation section that remodulates the signal to an open channel; and a distribution section that distributes the remodulated signal to the receiver. 43, the remodulation center includes the channel selection demodulation circuit, a restoration circuit, a scrambling device, a remodulation section, a distribution section,
42. The communal reception according to claim 41, further comprising a scrambling controller that operates to control a scrambling device to multiplex keywords that are information for unscrambling only for payers of paid broadcasting. system. 44. The receiver includes a channel selection section that inputs the signal distributed from the remodulation center and selects a desired channel from the input signal, and a channel selection section that descrambles the selected signal and restores the video signal and audio signal. 42. The community reception system according to claim 41, further comprising a descrambling device for outputting. 45. Claim 41, characterized in that the scrambling device is constituted by the multiplex transmission signal generating device according to claim 16.
The joint reception system described. 46. Claim 41, wherein the scrambling device is constituted by the multiplex transmission signal generating device according to claim 18.
The joint reception system described. 47. Claim 41, wherein the scrambling device is constituted by the multiplex transmission signal generating device according to claim 19.
The joint reception system described. 48. Claim 41, characterized in that the scrambling device is constituted by the multiplex transmission signal generating device according to claim 29.
The joint reception system described. 49. The tuning section is composed of a tuning circuit that generates a tuning voltage for the set desired channel, and a tuner that tunes the desired signal from the input signal using the generated tuning voltage and converts it into an IF signal, The descrambling device includes a demodulation circuit that demodulates the output of the tuner, a first descrambler that descrambles the demodulated signal and outputs a video signal and an audio signal, and a video signal that processes the output video signal and outputs it. 42. The community reception system according to claim 41, wherein the receiver is constituted by a processing circuit and an audio signal processing circuit that processes and outputs an output audio signal. 50. The tuning section is composed of a tuning circuit that generates a tuning voltage for a set desired channel, and a tuner that tunes the desired signal from the input signal using the generated tuning voltage and converts it into an IF signal, The rumble device includes a second descrambler that descrambles the tuner output signal and outputs a video signal and an audio signal, a video signal processing circuit that processes and outputs the descrambled video signal, and a descrambled audio signal. 42. The community reception system according to claim 41, wherein the receiver is configured by an audio signal processing circuit that processes and outputs a signal. 51. The tuning section includes a tuning circuit that generates a tuning voltage for a set desired channel and a switching control signal that specifies the type of unified scrambling for that channel, and a tuning circuit that generates a tuning voltage for the set desired channel and a switching control signal that specifies the type of unified scrambling for that channel, and a tuning circuit that generates a tuning voltage for the set desired channel and a switching control signal that specifies the type of unified scrambling for that channel, and a tuning circuit that generates a tuning voltage for the set desired channel and a switching control signal that specifies the type of unified scrambling for that channel. IF
A descrambling device includes a first switch that switches the output signal of the tuner according to a switching control signal, and a signal from one output of the first switch is input to the descrambling device to demodulate the input signal. A demodulation circuit, a first descrambler that descrambles the output signal from the demodulation circuit and outputs a first video signal and a first audio signal, and a signal from the other output of the first switch is input. The input signal is descrambled to produce a second video signal and a second video signal.
a second descrambler that outputs an audio signal; and a second switch that inputs a first video signal to one terminal and a second video signal to the other terminal and selects and outputs either one by a switching control signal. , a third switch inputs the first audio signal to one terminal and the second audio signal to the other terminal, selects either one using a switching control signal, and switches the output. 42. The receiver according to claim 41, wherein the receiver includes a video signal processing circuit that outputs a signal and an audio signal processing circuit that processes the output of the third switch and outputs an audio signal. Joint reception system. 52. The tuning section is connected to a tuning circuit that generates a tuning voltage for a set desired channel and a channel signal indicating which channel the desired channel is set to, and an input signal and a desired signal based on the generated tuning voltage. and a tuner that tunes and converts it into an IF signal, and the descrambling device controls the user code assigned to each channel using a demodulation circuit that demodulates the output of the tuner and a channel signal from a channel selection circuit. a user code control circuit that sends a user code control signal; and a first scrambler that selects a user code for the channel based on the user code control signal, descrambles the demodulated signal based on the user code, and outputs a video signal and an audio signal. , wherein the receiver is constituted by a video signal processing circuit that processes and outputs an output video signal, and an audio signal processing circuit that processes and outputs an output audio signal. The joint reception system according to claim 41. 53. The tuning section is configured to include a tuning circuit that generates a tuning voltage for a set desired channel and a channel signal indicating which channel the desired channel is set to, and a tuning circuit that generates a desired signal from an input signal using the generated tuning voltage. and a tuner that tunes and converts the descrambler into an IF signal, and a user code control circuit that sends a user code control signal that controls the user code assigned to each channel using the channel signal from the channel selection circuit. and a second device that selects a user code for that channel based on the user code control signal, descrambles the output signal from the tuner based on the user code, and outputs a video signal and an audio signal.
A descrambler, a video signal processing circuit that processes and outputs the output video signal, and an audio signal processing circuit that processes and outputs the output audio signal, and the receiver is configured. Claim 41 characterized in that
The joint reception system described. 54, the tuning unit is configured to generate a tuning voltage for the set desired channel, a switching control signal specifying the type of unified scrambling for that channel, and a channel signal indicating which channel the desired channel is set to. It consists of a station circuit and a tuner that tunes a desired signal from an input signal using a generated channel selection voltage and converts it into an IF signal. A user code control circuit that sends a user code control signal to control the code; a first switch that switches the output signal of the tuner using a switching control signal; and a signal from one output of the first switch is input to demodulate the input signal. a first descrambler that selects a user code for the channel based on a user code control signal, descrambles the demodulated signal based on the user code, and outputs a first video signal and a first audio signal; The signal from the other output of the first switch is input, the user code of that channel is selected by the user code control signal, and the output signal from the tuner is descrambled based on this, and the second video signal and the second audio signal are generated. a second descrambler that outputs;
A second switch inputs a first video signal to one terminal and a second video signal to the other terminal, selects either one using a switching control signal, and switches the output. a third switch that inputs a second audio signal, selects one of the two using a switching control signal, and outputs the selected one; a video signal processing circuit that processes the output of the second switch and outputs a video signal; 42. The community reception system according to claim 41, wherein the receiver is constituted by an audio signal processing circuit that processes the output of the switch and outputs an audio signal. 55. The community reception system according to claim 41, wherein the first descrambler is constituted by the multiplex transmission signal reproducing device according to claim 30. 56. The community reception system according to claim 41, wherein the second descrambler is constituted by the multiplex transmission signal reproducing device according to claim 30. 57. The community reception system according to claim 41, wherein the first descrambler is constituted by the multiplex transmission signal reproducing device according to claim 32. 58. The community reception system according to claim 41, wherein the first descrambler is constituted by the multiplex transmission signal reproducing device according to claim 40. 59. The community reception system according to claim 41, wherein the second descrambler is constituted by the multiplex transmission signal reproducing device according to claim 33. 60. The community reception system according to claim 41, wherein the scramble controller controls the scramble code generation circuit and the arithmetic circuit so as to transmit the correct keyword only to pay broadcast channel subscribers. . 61. Claim 4, wherein the user code control circuit operates to write a user code of a desired channel assigned to each channel into the user code storage circuit in response to a channel signal from the channel selection circuit.
The joint reception system described in 1. 62, a removable external storage medium that stores the user code assigned to each channel and the corresponding channel for the user code control circuit, and a readout circuit that reads each user code for each channel from the external storage medium; It is characterized by comprising a control circuit that receives a channel signal from the channel selection circuit, controls a reading circuit and the user code storage circuit, and controls the readout user code for the selected channel to be written in the user code storage circuit. The communal reception system according to claim 41.