JPS6338382A - Subscription broadcast system - Google Patents

Abstract

PURPOSE:To attain a scramble broadcast system having high secrecy by using a timepiece data generating means, a production means for random number data, and a scramble decoding means which produces the descramble random number data coincident with that of the encoder side at the decoder side based on the reproduced initial value. CONSTITUTION:The transmission time point data is delivered from a time point data generating block 4 set at the encoder side and supplied to a random number generator 5 for output of the random number data whose initial value varies according to the change with time of said time point data. The scramble data received from a scrambler 3 is supplied to a data superposing circuit 6 for multiplication and then sent to a circuit 8 as the RF transmission signals. These RF signals are processed at the decoder side by a received data processing block 9 and supplied to a data separating circuit 10 to be separated into the time transmission time point data and the scramble data. The transmission time point data is supplied to a random number generator 12 having the same constitution of the generator 5 for output of random numbers coincident with those of a scramble mode. These random numbers are supplied to a descrambler 11 for each descrambling action.

Description

[Detailed Description of the Invention] [Objective of Defense 1 (Field of Industrial Application) The present invention is directed to the addition of 〇ΔI' the law of nature)'! ,
Regarding the system, the time data is sent to the right r1 on the side of the screen.
"1st; As the data for deciphering Nota's first friend, Riko Ichikawa (from J, Deni) - the first friend of the Sho issue data 4 - updated according to the change in the time data. 1) In order to increase the likelihood of eavesdropping and viewing, please refer to the 9 transmission system.

(Prior art) In general, subscriber broadcasting systems such as CA TV etc.
To reserve a program, the subscriber sets the time 81 circuit on the device side, and the subscriber sets the time data from the 4 circuits, and then the reserved program starts! The i-time data is compared to which comparator each time the data is compared.

1! If you set the reservation time on the receiver side and the reservation
By comparing the output of the tear circuit with the data, the reception status of the reserved program can be determined.

-jj, i] Kutsu Broadcasting has non-contracted 1 who did not make a reservation.
In order to prevent 111 people from watching the program, I send a message to Buddha. Contract 1
+ 1 person's name), when notifying the broadcasting station of the child's contracted time, by sending the identification rJH of the subscriber's name, ・Reception 1)
, 11 notes of Descrannol's I key 1llI all 11 (the second and C are keyed).

Figure 8 shows a 111-person broadcasting system with 6 program reservation functions.
J lx rental example iJo In the same figure, join +1'izu (
Only the 11 terminal side is shown, and there is an anti-no (+j
7], for example, image image 6], γ1 μm image r4 is manually produced. When this sending bow is sent directly, it undergoes various kinds of scrambling processing, such as:
Any digital Iha issue is fine, but it's descrambled! The ζth control signal y: is / l sent F] in some form (
[Folded.

Channel data for received broadcast signals! Kome no Buko = Ng (, 1, 1k [il circuit (') 317)
This is done by setting the frequency division ratio. in this case,
The frequency division ratio is determined by the decoder 101.
By referring to the data corresponding to the channel data in the ROM 105, the data is jq'd. The received broadcast signal at this time undergoes a predetermined demodulation operation in the demodulation circuit 101, is amplified in the amplifier circuit 102, and is outputted from the output terminal 117J.

On the other hand, in order to reserve a program, the user uses the switch 115 to select the program to be reserved. The switch 115 has the function of selecting the program tunnel U"1, the function of inputting the reservation time, and the function of controlling the reservation ++ and ', in addition to selecting the program reservation channel.
If you want to directly select a program using the display switching function in step 1, press the switch 115 to select the reserved program. The channel data is manually input to the switch data input circuit 113. Today's switch data input circuit 1
The output of 13 is 111 in the switch data processing circuit 112.
1 is selected and the Buttonel γ-ta is selected by the switch 106.
through the decoder 10 A M +111λ. Decoder 1041, 2) The input data is transferred to ROM1 (15 to J, which is the frequency division ratio of Pll), and the frequency division ratio corresponds to the predetermined frequency by 1. j = - is determined, and the predetermined tunnel is accepted i"l (\
It will be done.

Listen, the decoder 104 and ROM 105
τ, converted to programmable Pl-1- data, I
]! 1103, and in PLI-103, the broadcasting signal of the frequency corresponding to the input data is transmitted to line 4.

Further, the switch 115 has a time function, and the switch 115 has a time reference 1-data f and an L-switch data processing circuit 112.
This ISIllt! The input data is output to the circuit 108 when the input data is input to the circuit 108.

Next, the recipient explains the reservation process for the program.

Program channel data, viewing start data, end date = 5 = f-ta of γi is switch data person card 11 path 113 at the time of reservation generated from switch J115.
The signal is input to the switch data processing circuit 112 via the switch data processing circuit 112.

This switch data processing circuit 1121 outputs reserved data such as reserved button/channel data, reserved data (18) and power supply data (1), and outputs channel data (4) during normal reception outside of reservations.

The reserved channel data is distributed to the reserved channel data processing circuit 110, and the reserved time data is distributed to the reserved channel data processing circuit 110.
It is distributed to the l path 108. Furthermore, the power supply control data is the power supply 11.
Place the valve at 6.

The display 114 is controlled by the display control circuit 111 and displays the current broadcast channel program being received, the current time, and the reservation button.
・The reservation time will be displayed at 11.1. In this case, the display grid is changed to b<'c by switching the display j''-ta to the switch 115.

Make a reservation! ,: Program reception is performed as follows.

The reserved channel data and reserved time data t reserved by the recipient are processed by the reserved channel data conversion circuit 110 and then stored in ΔM10':).

RAM1091C channel 1~A reserved channel 11
- Data and 0:r approx. time data is human! (Switching knob 10
6, added to comparator 1C)7. In the comparator 107,
A comparison is made between the current time data of the built-in time 31 circuit 10B on the receiver side and the -1- marked reservation pasting data. In this case, the comparator 107 indicates that the extraction force is 1! -1 1. : If it does, shut off the power supply 116 and turn on the R
The changeover switch 106 is controlled to supply the reserved block I/channel data stored in the AM 109 to the decoder 104. Here, the reservation 11 that was differentially programmed with the differential gear 104? The channel data ROM 105 is converted into frequency-divided data corresponding to the corresponding reserved block 17 channel data, and F)L, 11('):1 is the reserved channel? χ in the channel
・Perform appropriate training.

Also, the end of the reservation Gunful 11! At I, the comparator 107 compares the current time data and the reserved time data, and controls the power supply to be cut off at 1 to 1, where a -extraction output is obtained.

However, this J is in the system d-3 and the scrambled broadcast signal is f-scrambled.V) Key information 011
11 transmission, there remains the problem that unauthorized viewing may be caused by t i <r.

For example, scrambling methods include (, (scanning lines or (), or scrambling using time axis replacement processing to match pixels, but in general, the above human table content uses the output of a random number generator. For example, the random number generator returns the output of one of the Schiffmil registers to the input terminal via a predetermined logic circuit.
A PN pattern 'R, 11 circuit is known.

In this case, the same random number as that generated by the broadcasting station is used to
Correct descrambling is performed in the process. In order to match the random numbers on the broadcasting station side and the receiver side, it is best to avoid matching the initial values of the random numbers on the broadcasting station side and receiver side.This!
V) The broadcasting station side sends the identification r1 of subscriber i sent at the time of reservation and the 1-2 first 1111 bribe as a secret sauce. The receiver side has an identification code Y), so reserve it and use the IC.
You can get the initial value only by joining.

In this way, in the conventional system, the key information for unscrambling is transmitted in 1. It is relatively easy to decipher by mischief.

(Problems to be Solved by the Invention) Although the conventional scrambling technology 1, in which the initial value for the random number summation is transmitted as a secret, Just in time to be discovered (j is-
) /, T, .

The present invention solves the problem 1 and provides a subscriber broadcasting system that can perform scrambled broadcasting with a high degree of secrecy f1 even though initial 1+r+ is difficult to decode.

[Means of the invention
Means for emitting transmission time data, Ll for transmission time data
Then, the first stage generates random number data for scrambling whose initial value is modified over time, and the random number data from this means is used to scramble the broadcast signal! A means for transmitting the scrambled broadcast signal to the decoder side along with the transmission time data, and resetting the initial value of the transmission time data J on the data side and transmitting the scrambled broadcast signal to the encoder side based on this initial value. It is equipped with one stage of descrambled random number data numbered R11 that matches the number, and transmits the key information for decoding the random number data.

-〇- (f+river) In the advantageous broadcasting system, viewing by 1111 non-contracted people is t! It +t knee 46 IV) Only contract subscribers who have scrambled the M transmission signal and made a reservation to view the reservation 11.1 hour data and () can obtain the initial random number value for unscrambling. In the present invention, 1
According to the clock data in the time 81 circuit on the data side, the initial value changes from time to time (random number) 2 becomes 1, and this random number data is used as the broadcast signal. Then, the above-mentioned time h1 data is transmitted to the decoder side together with the broadcast signal. On the F-i-G side, ' is used to send information such as Y to the broadcasting station side, and the above-mentioned transmission 1! It is possible to decipher the initial value based on the instantaneous data and perform correct descrambling.In other words, the present invention allows the initial value to be managed on both the broadcasting station side and the receiver side. As a result, the key information for decoding the initial value is not sent, so the 61f protection becomes effective against unauthorized viewing.

(Example) The present invention will be described above with reference to the illustrated embodiments.

FIG. 1 is a block circuit diagram showing the present invention in a simplified manner. In FIG. 1, a right-handed broadcasting signal is supplied to the input terminal 1 on the terminal 1, and the signal from the same terminal 1 is transmitted via a human-powered data processing block 2 to the terminal 11. It is guided to one input end of the scrambler=3 by the sum circuit. A time data generation block 4 is provided on the encoder side, and this block 4 outputs transmission time data. Transmission tense data (or random number light from a PN pattern generator, etc.) is input manually to a device 5, and the generator 5 outputs random number data whose first time changes in accordance with changes in transmission time data over time. -1- Random number data is led to the other input terminal of the scrambler 3, and is scrambled by 1 on the broadcast signal. The scrambled data t output from the scrambler 3 and the transmission time data are supplied to a manually operated data superimposition circuit 6, and the transmission auxiliary data is multiplied during a predetermined period of the scrambled data. The output from the data superimposition circuit 6 is sent to the line 8 via the output data processing block 7 as an RF transmission signal.

The R transmission signal from line 8 is processed by a reception data processing block 9 on the decoder side and input to a data separation circuit 10. The data separation circuit 10 separates transmission time data and scrambled data. The transmission time data is transmitted by random number light (1-device 12
The random number generator 12 outputs a random number that matches the value used during scrambling. This random number light (random number data from the 1-device 12 and the scrambled data are manually inputted to the descrambler 1-11, respectively,
1. Data from the descrambler 11 is processed by an output circuit 13 and sent to a television receiver through an output terminal 14.

FIGS. 2 and 3 show practical configurations of the system shown in FIG. 1.

Note that the broadcast signal will be explained using a high-pitched signal as an example.

Input analog (8
There is a digital signal service that converts the signal into digital and has an error correction function for code errors in the transmission system. In this type of digital sound service, data is normally transmitted in an interleaved manner, and the shadows ν caused by the sounds 1 to ↑M are suppressed, making it possible to convert the data into 8-quality data.

First, FIG. 2 shows a Jn]-da circuit. Input terminal 201
A broadcast J-besa analog tone signal is applied to the signal. This analog signal is converted into a digital signal by a Δ/D converter 202, and then converted into serial data by a P/S conversion circuit 203. And data compression circuit 20
4, data compression is performed to improve transmission efficiency. An error correction code is added to the data reduced by one in an error correction fl addition path 206 via a scrambler 3 and a data superimposition circuit 6, which are constituted by an exclusive OR circuit. This serial data to which a predetermined code such as an error correction code is added is processed by an interleave circuit 207.
The output signal is interleaved at a modulation circuit 208, subjected to a predetermined conversion process at a modulation circuit 208, and further amplified at a predetermined R[frequency by a frequency conversion circuit 209 and amplified by an amplifier 210. be done.

Timing signals for the above data processing are generated by a timing circuit 212. This timing circuit 212 is the P/S! conversion circuit 203, data compression circuit 204,
and P/S conversion circuit 21 when transmitting time data.
3. Generate an operation timing signal for the data compression circuit 214.

Il! The i g4 circuit 215 generates current time data, and this current time data is converted to [)/S by the P/S converter 213.
The converted data is further compressed by a data compression circuit 214 and then added to the data multiplexing circuit 6.

This data multiplexing circuit 6 poetically superimposes the digitized audio data and the current time data.

Further, in this embodiment, time data from the P/S converter 213 is supplied to the random number generator 5. The random number generator 5 is
As explained in FIG. 1, the initial value of the random number data to be output is changed every time the content of the time t1 data is updated.

Next, a decoder circuit that decodes scrambled broadcast signals transmitted via a transmission path will be described.

In Figure 3, the same functions as in Figure 1 are added to Song i1 /' r
The same code will be given to each ``1 Tsuku''. A transmission signal input to a terminal 301 is frequency-converted by a frequency conversion circuit 302 .

The data received by the tickoning operation based on this frequency conversion effect is separated by the demodulation circuit 303.

The data separated here is deinterleaved by a deinterleaving circuit 304 and then sent to an error correction circuit 304.
At step 05, the code error is corrected and the digital data string becomes loud.

This digital data string is divided into digital name μm data and current time data by the data separation circuit 10.

At this time, the separated compressed audio data is processed by a scrambler.
11, the γe Nj data is expanded by the expansion circuit 307, and then converted to analog M by the I)/A conversion circuit 308. It is output to the B re-output terminal 311.

Broadcast selection is accomplished by setting a frequency division ratio for J in the Pl-L circuit 312. In addition, when receiving data, Bucket 1-Domei uses a synchronization pattern that uses light (1-) in the invention pattern invention/l-circuit 313 to match the transmission synchronization pattern with the 111-transparent raccoon phase circuit 31/l. In other words, according to the pattern generated by the 1 circuit 313-C, the +JI transitive OR circuit 4 determines whether or not the same till timing is appropriate. used. In this way, the data acquisition timing is controlled, and at this time, the latch circuit 31 latches the pattern matching signal detected by the 111 algebraic OR circuit 3171 described in -1-.
8 [A timing pulse is generated according to the output of the counter circuit 317 to be retold]
II〈Occurs in OM 316.

On the other hand, the current time data separated by the data separation circuit 10 is transferred to the random number generator/l-generator 12 and the S/P conversion circuit 315.
supplied to Random number generation/1 device 12 is h! It is configured with the same circuit as the transmitting station side, and the random number data that is output is erased as the current time data is distorted over time, with the initial 11f4 corresponding to the transmitting side. As a result, a pattern matching that of the broadcasting station will be emitted. In addition, S/P transformation circuit 31
5'r'' The current time data converted into parallel data is supplied to the RAM 320 for storing time data., RAM 32
Writing and reading of 0 is performed by a DMA circuit 319 which generates an address signal in response to a timing pulse from the timing generation ROM. in this case,
In order to improve the efficiency of write and read processing, so-called cycle processing is used.

The time data written in this ΔM 320 is used for control such as program reservation control. The control section 333, which uses this current time data to control program reservations, broadcast reception, etc., is comprised of circuits such as those shown in FIG. R.A.
The time data written into M320 is applied to display control circuit 330 and comparator 325. Display control circuit 3
The current time data added to 30 drives a display 331 and is displayed on a display means such as a liquid crystal display, which functions as a time screen 1 for the names of 811 people on the adder side.

By operating the switch circuit 332, the subscriber
Would you like to make a reservation? The channel and program start or end time can be set, and the 18th channel can be controlled directly.

In the program reservation control mode, reservation data such as the reservation channel and program start time data that have not been set are sent to the switch data input circuit 329 via the switch data input circuit 329.
8 is input. This reservation data is stored in the RAM after predetermined data processing is performed by the reservation program storage control circuit 327.
Added to 326. The reservation data from the RAM 326 and the reservation time data are supplied to a comparator 325j and compared with the current time data from the RAM 320. Further, among the reservation data, the reservation channel f-ta is switched to the third end side of the changeover switch 324.

Then, the comparator 3255 compares the current time data read from the above ΔM 320 with the reservation time i' read from the above RΔM 326.

Here, the above reservation time data is currently 11. When the 7 digits match, the output of the comparator 325 ((switching switch = 18) switches the switch 32/I to the 1: end A side. The reserved channel data set in accordance with the reserved time data is added to the RAM 326 in the data 1-der 321. ROM 322
Generates the necessary address for reading from.

Then, according to this address, the child program 1 is stored from the ROM 322.
P L, l γ-ta corresponding to 1 channel is 1] II-
applied to circuit 312. In this case, the automatic tuning circuit 32
3 is J to the match signal from the latch circuit 318.

Steps 11 and 11 to select the channel are performed in step 321.

In this way, the frequency division ratio is set in the [)11 circuit 312 in accordance with the reserved channel, so that reception of the C reserved channel 17 is possible. I1, even when receiving a reserved channel, what is the cycle of the synchronization pattern? be.

In addition, when the subscriber directly selects a channel by operating the switch 332, the selector switch 324 is connected to the terminal Δ side by the output of the -1- record comparator 325, and the channel selection data is Frequency division ratio data corresponding to the selected channel is read out from 110M322 to data 1-der 321 via switch data processing circuit 328? Second data is applied. Then, J, redirect 1 to channel selection are performed.

FIG. 4 shows the timing relationship between the clock data and the audio data in the encoder circuit. -1-C exists. In this way, on the h-transmitting station side, the digital audio data (FIG. 2(a)) digitized by the 1)/S conversion circuit 203 is transferred to the data compression circuit 20/
The data 11 is compressed at I, and the serial data 181J becomes shorter with this compression (FIG. 2(b)). 11 between these compressed data packets. In order to compress the data between 'J' and 1, the data is multiplexed by the data multiplexing circuit 6 according to the timing of the multiplex timing pulse (Fig. 2 (C)) (Fig. 2 (d)). .

The data string in which the current time timing information is multiplied in this way is interleaved in the format shown in FIG. 5, and then sent out from the J-]-da side. Transmission format 1~ is 1bano Itsui~ is 64
It consists of 32 buckets 1 to 1, and 32 buckets 1 constitutes one frame. Time &'l data is "month".

Paro IZ 11 o'clock'', several buckets of data strings indicating ``minutes''
It is transmitted at 1 node per minute.

FIG. 6 is a circuit diagram showing an example of a specific circuit configuration of the random number generator 12.

The random number generator 12 used in this embodiment is an optical/1 circuit with a PN pattern, and when transmitting from the data separation circuit 10, n1
Since the gator is a digital data string, first, S/1
) The conversion circuit 401 converts the data into parallel data. In this case, in order to take only the time data (h), the timing circuit 31
The data extraction pulse G3 from 6 is sent to the SAP conversion circuit 40.
1.

The parallel data is supplied to a latch circuit 402 whose latch operation is controlled by pulse T1.

This pulse is used to add one frame of scrambled (descrambled) audio data to the time data. This is done by descrambling the time data on the decoder side at the same timing as on the decoder side.
．． This is because the decoder side needs to know the time data in advance since h does not occur if r4-J.

Next, the output of the latch circuit 402 is input as address data to the ROM 403 in which the initial (1 data) is stored. As a result, the initial value data of the random number according to the PN pattern corresponding to the time data is input from the ROM 403 to the time data. The data is updated and read out one after another in response to light changes in the data.This data is output in parallel, and this initial value data is converted by the timing pulse T2.
The data is manually input to the detection circuit 103, converted into serial data, and then transmitted via the circuit 1 to circuit 405 to the shift register 406, which serves as the input signal for the PN pattern generator. The shift register 406 is composed of stages, and a predetermined logic circuit 407 is connected to each output terminal. So, in this circuit,
The signal from the 1i final bit output terminal is sent to the gate circuit 405.
The signal is fed back to the same gate circuit /I05 and is again input as data to the shift me register /106. In addition,
The gate circuit 405 transfers the initial value data to the registers 1 to 106 at the "l" nu level.
I+"high level front control) final" leads the tsu1~ signal to the shiso1~ register 406. Therefore, the above-mentioned circuit/
Random number data from I07 is scrambled (descrambled) sound pi data dodge through an AND circuit 408 which performs scramble operation from timing generator 316 (j゛ scramble operation amount 1; The operation selection body temperature 02 is derived from the sound 79i.
This is a signal that goes high level between data brightness, and as a result, /7nd circuit 40B listens to data 1 to 1 in correspondence with the audio data period. In addition, S/[) variable 1φ circuit/101. P/
The S conversion circuit 404 and the shift register 406 are each driven by a common 9-day clock signal GK.

Next, the operation shown in Fig. 6 will be explained in 3) with reference to Fig. 7.
FIG. 7 shows a timing generator-1 for explaining random number data updated by time data in three frames (n, n+1.n-+2). J3, the circuit on the decoder side will be explained.

R&'l or X to Y during the period of frame n? j, the wrap circuit'l 02 i, L, frame'
Wrap the supplementary data X in 1 and create a frame ("))
1) Smell (IlllI gai day wrap.) ROM 403 is 11.+ during frame n period.
The initial value data that corresponds to S・1 to the + tick data By inputting the initial value data into the shift 1 register 406 and controlling the gate circuit/105, the AND circuit/
I Ofl J:Random number data (,1, time 4
．． 11 Function f (X) with data X as a parameter. This random number data (, 1 scrambled audio data (f
), it can be seen that the timing of both data coincides, and the scrambled audio data (f ) t, t
, descrambled by random number data f(X),
It becomes 舊ii' data (C).

Similarly, the end of frame (n + 1) Ii! The load pulse that is emitted 1η before 1 is a frame (rzl) (・o,
? Since the time data has become necessary for Y, the initial value data corresponding to the time data Y is incremented by 14 for the first scrambled audio data of frame (n-[2), and random number data generated according to this data thereafter. By f(Y),
Scramble γ (-M data can be descrambled. (0) indicates transmission data, (d
) is supported.

As is clear from the above explanation, this embodiment does not transmit key information to the descrambler, and this key information is
The J1
The data disclosed in the subscription name is transmission time data. Therefore, even if a non-participating ministry tries to eavesdrop on the scrambled right-handed broadcasts, it will be difficult to decipher the initial information.

In this embodiment, the clock data transmitted from the broadcasting station side to the receiver side is used as a descrambling signal to realize a right-handed broadcasting system 11 that is extremely difficult to decipher.

41. The transmission time data 1 need only be data that fades over time, and does not necessarily need to be the time data C. Furthermore, the subscriber broadcasting system of this embodiment can be applied to any form of free broadcasting.

[Efficacy of the invention in Song Dynasty] If the above-mentioned J and Unimoto defenses are followed, the data for decoding the scramble is transmitted as irr I.
It has the advantage of high secrecy, and since the pattern changes from 0 to 2, the scramble rate is also high.

[Brief explanation of the drawing]

FIG. 1 shows the basic concept of the present invention, and FIG. FIG. 3 is a circuit diagram showing the decoder side of the transmission system, FIG. 3 is a circuit diagram showing the decoder side of the same embodiment, and FIGS. 4 and 5 are explanatory diagrams for explaining the present invention in detail. , FIG. 6 shows an example of a specific circuit of the random number generator used in the embodiments of FIGS. 2 and 3. 1 circuit diagram, FIG. Figure 1 and Figure 8 are circuit diagrams showing an example of the data side circuit used in a conventional subscription broadcasting system. generator, 6
...Data Φ front circuit, 10...Data separation circuit,
11... Descrambler 12... Random number generator, 215...15 i1 circuit.

Claims (1)

[Scope of Claims] A subscriber broadcasting system that scrambles a broadcast signal according to random number data on the encoder side and transmits it to the decoder side, comprising: clock data generation means for generating transmission time data on the encoder side; and means for generating the random number data. a random number data generating means whose initial value is changed over time based on the transmission time data from the clock data generating means, and scrambling the broadcast signal using the random number data from the random number data generating means. , a means for transmitting the scrambled broadcast signal together with the transmission time data to the decoder side; and a descrambler for reproducing an initial value from the transmission time data on the decoder side and matching that on the encoder side based on the reproduced initial value. A subscriber broadcasting system comprising at least: a scramble decoding means for generating random number data.