JPS622736A - Information service system with addressing - Google Patents

Abstract

PURPOSE:To secure the information service for a hull contracted period by transmitting simultaneously two types of key codes different in pattern used in the contract periods of this time and the next time, at addressing a decoder, and storing both key codes in a memory at the decoder side. CONSTITUTION:Two types of key codes KC are transmitted simultaneously in an addressing format. Both key codes KC1 and KC2 of this month and the next month are transmitted simultaneously in an addressing mode. At the same time, the addressing operation is performed. In such a case, both codes KC1 and KC2 are stored. Therefore, the information service of the relevant month can be secured even after the addressing operation. Thus it is possible to secure the data service of this month even in case the addressing operation is carried out before the next reception contract period. As a result, no key code is replaced and therefore the data service is secured for a full paid reception contract period.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G1 General explanation of the information service system G2 Basics of the information service system System diagram showing the schematic configuration (Fig. 1) Format of the transmission signal inserted into the G3 broadcast signal (Fig. 2) G. Format of the service data section SD before shuffling (Fig. 3) G5 service data H3D Formant showing the relationship between the following service data SDA (Fig. 4) Explanation of G6 baud rate section BR (Fig. 5) Explanation of G and control data section CD (Fig. 6) Explanation of G8 zinc code, SC ( Figure 7) Explanation of G9 control data CDA (Figure 8) GIO Atranging's Kato Mei (Figure 9) Formant of Gl+addressing data AD (Figure 9) Reason for using G122 types of key codes G13 Reason for setting multiple addressing modes G14 System diagram of receiver 30 (Figure 11) Circuit explanation of GI5 decoder 50 (Figure 12) CI6 Service data SD
Decoding process of A G17 Decoding process in addressing mode cps sync code detection section 60 and judgment circuit section 5
Explanation of No. 9 (Fig. 13) H Effects of the Invention A Industrial Application Field This invention is a new information service system that can conceal information data and provide information services for a fee, especially this system. This relates to the key code stored in the decoder during addressing of the decoder used in .

B. Summary of the Invention The present invention relates to an information service system in which information data is concealed and information services are charged.

This information service system receives the service data and key code sent from the database station using a decoder installed on the subscriber side, and the transmitted key code after decoding these data becomes the key code on the receiving side. This system allows you to receive a specific information service sent from a database station only if there is a match.

In this invention, when addressing the decoder, two types of key codes with different patterns to be used for the current contract period and the next contract period are simultaneously sent and stored as the key codes to be stored in the decoder. As a result, even if the reception contracts are different, the information service can always be received for the entire contracted period.

C. Prior Art As an information service system that allows specific information to be provided only to specific subscribers, there are conventionally known information service systems that utilize a dedicated line or the like.

Specifically, specific information transmitted from the database station using a dedicated line is received by a decoder installed on the subscriber side, and the information provided by the station side can be received. There is.

D. Problems to be Solved by the Invention However, the above-mentioned information service system has a limit because it becomes difficult to secure a dedicated line when the number of subscribers increases significantly.

In addition, if the information provided by the station requires a large amount of money to collect the information and provide information transmission equipment, such as stock information or commodity trading information in multiple markets, non-subscribers may It is necessary to devise a system in which the information cannot be easily decoded. In conventional information service systems, the information can be easily obtained by simply installing a decoder on the subscriber side, so even non-subscribers can easily obtain the information.

In such a case, it is necessary to take advanced measures to prevent wiretapping, but conventionally such concealment measures have not been adopted.

Furthermore, conventionally, once a decoder is purchased, information can always be provided as long as the user owns the decoder. However, as mentioned above, when the cost of collecting information and the cost of equipment for station operation are enormous, it is preferable to provide the information for a fee.

Therefore, an information service system that targets a large number of subscribers, ensures confidentiality of information, and charges a fee has not yet been developed.

This invention takes these points into consideration, and solves problems when configuring an information service system that can realize information confidentiality and paid information services, that is, problems when addressing a decoder sent from the station side. This is the solution.

That is, by addressing the decoder before the next reception contract period, the problem of not being able to receive the data service sent during the current reception contract period that remains after addressing is solved by extremely simple addressing.

E. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention employs the following means.

That is, in this invention, the service data and key code sent from the database station are received by a decoder provided on the subscriber side, and the key code sent after decoding these data matches the key code on the receiving side. Only when the database station receives the specific information service sent out by the database station, it is possible to receive a specific information service sent from the database station. This system simultaneously sends out different types of key codes and stores them in the decoder side.

F Effect In this configuration, if, for example, the reception contract fee for this month has been paid but the reception contract fee for the next month has not been paid, the key code sent from the station side when addressing the decoder will be the key code for this month. code and key code for the next month,
Since the address data is a code indicating that the reception contract fee for the next month has not been paid, addressing is not performed for that decoder. Therefore, the memory contents within that decoder are not updated and remain as they were.

As a result, the key code corresponding to this month sent from the station after addressing ends matches the key code stored in the decoder, ensuring the provision of information sent during the remaining period of this month after addressing. can be received.

G. Embodiment FIG. 1 is a schematic configuration diagram showing an example of an information service system that is the premise of this invention, but before explaining it, the structure of the information service system according to this invention will be explained. .

G. Description of the Information Service System This information service system, as described above, receives service data and key codes sent from the database station using a decoder installed on the subscriber side, and decodes these data. A system in which a specific information service sent from a database station can be received only when the key code sent by the database station matches the key code on the receiving side.

The first feature is that the transmitted data is encrypted to prevent eavesdropping.

This is to make it difficult for non-subscribers to obtain information, as described above, and to make it possible to provide specific information only to specified subscribers.

Second, information services are charged.

In other words, the system is such that only those who have paid the fee can receive information services.

To this end, in this system, a reception contract period, for example, a monthly reception contract period, is determined, and information can be continuously provided by updating the contract period.

Payment of fees for each reception contract period and non-payment are checked on the station side, and if the fees are not paid, the information service is automatically stopped, so the addressing on the decoder side, which will be described later, is the same as data transmission. carried out by means.

Therefore, after addressing, a key code is transmitted at the same time as the data transmission described above, and only when the transmitted key code matches the key code stored in the receiver's decoder (the key code stored by addressing), information is sent. You can receive the offer.

System diagram showing the basic schematic configuration of the G2 information service system Now, FIG. 1 is a block diagram showing an example of a new information service system 10 that is the premise of the present invention.

10A is a database station, IOB is a ground relay station, 10C
is a receiving station (subscribing station), and the transmission signal formed by the database station 10A is inserted into a predetermined horizontal line or several horizontal lines in the vertical blanking period of the broadcast signal, and the broadcast signal into which the transmission signal is inserted is (The format is shown in FIG. 2) is transmitted to the broadcasting satellite 22, and from the broadcasting satellite 22 this broadcasting signal is transmitted to the terrestrial relay station 10B.

The terrestrial radio station 10B has a BS antenna 24, and the SHF band broadcast signal received by this antenna is supplied to a transmitter 26 via a BS converter 25, and the broadcast signal is converted into LIHF or VHF suitable for retransmission. The signal is converted into a broadcast signal of the same frequency band, and is fed to the antenna 27 and transmitted to the plurality of receiving stations 10C.

The broadcast signal received by the antenna 29 of the receiving station 10C is decoded by the transmission signal inserted into the broadcast signal in the receiver 30, and the service data obtained as a result of the decoding is supplied to the personal computer 31, and the necessary information is Once selected, it is provided to the monitor 32 to monitor its data.

Assuming that a maximum of 8 horizontal lines (8 channels) are used as transmission signals inserted into broadcast signals, it is possible to install multiple database stations IIA to IIH in the database station 10A, and therefore 8 databases IIA to IIH according to the number of channels mentioned above. can.

The database IIA-11H includes large host computers 12A to 12H and a BILLING computer 13A corresponding to each database.
-138 is EIHed. The host computer collects stock information, product transaction information, etc. for each region to form service information data (hereinafter referred to as service data) to provide to customers.

The pilling computer manages the reception contract status of each subscriber subscribed to each database, and forms pilling data, ie, addressing data, corresponding to the reception contract and its P1;8 for each reception contract period.

Service data and pilling data are supplied to corresponding processors (front end processors, FEPs) 14A to 14H using telephone lines or dedicated lines. One processor can process one channel of data, where one data channel corresponds to one horizontal line inserted into the video signal.

Each of the processors 14A to 14H has eight data input ports, and can multiplex up to eight types of service levels for one channel. Therefore,
As shown in FIG. 1, the service data transmitted from the first database IIA is transmitted to all processors 14A to 1
It is designed so that it can be input to the 4H port. 2nd~
The same applies to service data from the eighth databases IIB to IIH. Therefore, eight processors 14A~
14f (can handle up to 64 types of service data.

Each of the processors 14A to 14H is connected to a host computer 15 that generates control data, which will be described later, and a shuffled transmission signal is formed based on this data.

The transmission signal is superimposed on the video signal supplied to the terminal 18 in the data insertion circuit 17 . Which horizontal line in the vertical blanking period the transmission signal is inserted into is determined by a control signal (not shown) supplied thereto.

The broadcast signal into which the transmission signal has been inserted is sent to S at the transmitter 2o.
After being converted into an HF band signal, it is transmitted to a broadcasting satellite 22 by a BS antenna 21.

Format of the transmission signal inserted into the G3 broadcast signal Now, Figure 2 shows an example of the format (for one horizontal line) of the transmission signal superimposed on the broadcast signal. Data section SD (21 bytes in this example) ■, Check focus section CB for this service data section SD (10 bytes) ■, Control data section CD inserted at the front of the service data section SD (1 byte) ■, Control Focus sync inserted at the front of the data section CD (2 bytes)
It is composed of a synchronous data section (1) consisting of BIS and byte sync BYS (1 byte), and a channel address section CA (1 byte) inserted between the synchronous data section and control data section CD.

The synchronous data section is clock data inserted to decode the transmission signal.

The channel address section CA is data indicating the type of channel used.

The control data portion CD is data indicating shuffling block data, shuffling map data, etc. for the shuffled service data portion SD, etc., and this control data portion CD is also transmitted in a shuffled state.

The service data section SD is data provided for customer services such as securities information.

Format of service data section SD before G4 shuffling FIG. 3 shows the format of service data section SD before shuffling.

In this example, the service data section SD has 62 fields (
62 lines) as one data block, and one data block further consists of eight service blocks (SB,
~5Bs).

The data inserted into one horizontal line of one data block is 31 bytes, and one service block consists of 31 bits.

The data inserted into the first field before shuffling is the header data portion HD, and the second field and subsequent fields are service data SDA.

The header data portion HD is used as decoding information (service data multiplexing information, etc.) for the service data SDA inserted below the second field.

Formant showing the relationship between the G5 service data section SD and the following service data SDA FIG. 4 is a formant showing the relationship between the service data section SD and the following service data SDA.

That is, in the first horizontal line corresponding to the first field, a header data portion HD of a formant such as "open park" is located for each service block. The header data section HD includes: (1) Service level section 5L (3 bits) This indicates data indicating which channel is used to insert service data.

(2) Baud rate section BR (2 bits) This is because the configuration of the service block during transmission differs depending on the baud rate. The details will be described later.

■, Sync/Async (SYNC/ASY\C) part S
A S (1 pin) This is data indicating whether data is transmitted in synchronous mode or asynchronous mode.

■Key code section KC (4 bits) This is a key code inserted for each service of the current month to ensure that only paying subscribers can receive information services. It is compared with the key code sent to the decoder, and if they match, the data service is executed.

(2) Line data end 1flLDE (5 bits) Since the block lengths that make up one service protocol differ for each service block, this data indicates the number of lines that make up the block.

In the case shown in FIG. 4, the service block ends at the 58th line, so in this case, data indicating that the 58th line is the last line is inserted as the line data end part LDE. .

■Bit data end part BDE (5 bits) This data indicates the number of bits in the final line of the service block.In the example shown in FIG. 4, the 10th bit is the final bit, so this final bit is It is expressed by the data end part BDE.

formatted like this.

Even after shuffling, the head 7 data portion HD of such a formant is applied to the first horizontal line of each service processor 7.

G6 Description of baud rate section BR The structure of the service block during transmission differs depending on the baud rate section BR.

For example, when the transmission capacity is up to 9600 baud,
When the transmission rate is set to 9600 baud, the first to eighth service blocks SB, ~SB
Data composed of @ is only one channel data, and when composed at 4800 baud, two channels of data can be transmitted as shown in FIG. Examples of other baud rates are shown in C and D of the same figure.However, since 2400 baud and 1200 baud can be selected,
It is easy to understand that combinations other than those illustrated may also be used.

The above-mentioned hander data section HD, service data SDA and check bit section CB are shuffled within each line and also between 62 lines.

However, even after shuffling, the service data section SD
The processing in which the above-mentioned hander data section HD is located is executed by the processors 14A to 14H.

i5 of the G7 control data section CD [Figures 6 to 8]
The figures up to the figure are used to explain the contents of the control data section CD.

The control data section CD is also shuffled except for some data, and an example of the structure of the control data section CD corresponding to one block after being deshuffled is shown in FIG.

The control data section CD has a variable length data structure, which is as follows: 1) sync code SC (1 byte) 2) control data CDA (48 bytes fixed length) 2) dummy code DC (4 to 11 bytes variable length) long code).

The sync code SC is used as data information for deshuffling the shuffled control data portion CD and as data information indicating a division of the control data portion CD. When using 64 types of sync codes as the sync code sc, the control data section CD
You can select from 64 different shuffling patterns.

G8 Description of Sync Code SC The sync code SC is not subjected to shuffling processing.The sync code Sc is considered to be a sync code SC only when the same code is inserted three times in succession.

That is, as shown in FIG. 7, this sync code SC is inserted from the first line to the third line.

The 48 bytes of data following the sync code SC becomes control data CDA.

The control data CDA includes shuffling block information of the service data section SD transmitted to the decoder 50 (see FIG. 12) and its shuffling map information.

G9 Description of Control Data CDA FIG. 8 shows an example of the format of control data CDA (before shuffling).

The control data CDA is composed of 4 bytes as a basic unit, and the first 2 bytes are shuffling block data S.
In B, the last two bytes are shuffling map data SM.

First, shuffling block data SB is formed using 2 bits of the first byte and 4 bits of the second byte, a total of 6 bits. Check code CC inserted into each byte
is for data checking of shuffling block data SB inserted into each byte.

The shuffling map data SM is formed using 2 bits of the third byte and 4 bits of the fourth byte, a total of 6 bits. The check code CC inserted into each byte is for checking the shuffling map data SM inserted into each byte.

The same code as this control data CDA is repeated 5 times (
A total of 20 bytes) are inserted, so the format before shirtring is as shown in FIG.

The reason why the same data is used five times in this way is to avoid malfunctions caused by noise mixed in during transmission. Control data CDA
I am trying to use it as.

The control data section CD has a fixed length of 48 bytes, and the data following the above-mentioned control data CDA is used as optional data. Therefore, data slots after 20 bytes are not used as control data.

The dummy code DC inserted at the rear of the control data CDA has a variable length, so that the code length of the entire control data section CD has a variable length configuration. In this example, the control data section CD is varied over 55 to 62 fields, and therefore the dummy code DC is 4 to 62 fields.
This is any code length between 11 fields. As a result, the control data section CD consists of 55 to 62 fields per program.

The dummy code DC uses a code pattern that is not present in the sync code SC. This is the control data part C
This is to accurately separate the sync code SC from D.

If the control data section CD is configured to have a variable length, it becomes difficult to detect the control data section CD inserted into the l block, which complicates the data deshuffling process by non-subscribers and reduces the confidentiality of information. will be strengthened.

Furthermore, although the control data portion CD includes a sync code SC that has not been shuffled, even if the sync code SC has not been shuffled, the code length of the control data portion CD itself is variable. Control data section CD cannot be easily decoded.

However, the decoder installed by the subscriber has a map of the deshuffling pattern that detects the sync code SC and deshuffles the control data section CD. Ring processing can be performed accurately.

In this case, since the data length (48 bytes) following the sync code SC is constant, it is relatively easy to detect this sync code SC):c on the decoder side.

As described above, the control data part CD is shuffled according to the type of the sync code SC, and by decoding the shuffling muff data SM included in the shuffled control data CDA,
The service data portion SD will be deshuffled.

The service data section SD and control data section CD shuffled in this way are inserted into one horizontal line in units of 31 bytes, thereby constructing the formant of the transmission signal shown in FIG. 2. In this case, the synchronization data (see FIG. 2) inserted into each horizontal line is not shuffled.

Explanation of COO Addressing Before sending out the transmission signal shown in FIG. 2, addressing to the decoder 50G2 provided in the receiver 30 is performed as a preliminary step.

Addressing is also performed using broadcast signals as well as transmission signals. In this case, among the transmission signals shown in FIG. 2, one in which addressing data ADA is inserted instead of service data SDA is used as the transmission signal.

First, an overview of addressing will be explained.

The plurality of decoders provided in the plurality of receiving stations 10C include
A non-volatile memory is provided to store the key code.
The key code transmitted during addressing is stored in these memories. Consecutive addresses are attached to the decoder, and when an address that specifies the decoder (an address map may be used) is transmitted, it enters a key code waiting state and the binary code of the address map becomes "1". The writing state of the key code is automatically controlled depending on whether the key code is '0' or '0'.

For example, if the binary code is "1", writing is enabled, and when the binary code of the address map is "1", the key code is written to the corresponding decoder. Therefore, In this case, when the binary code is "1", it means that the reception contract fee has been paid.

When the binary code is "0", the reception contract fee has not been paid, so in that case, the key code is not stored in the corresponding decoder.

Addressing is performed for each reception contract period, and the addressing period is performed using a predetermined period before the reception contract period (which may extend into the next month's reception contract period).

As shown in the second circle, the current month's key code KC is inserted into the transmission signal, so the information service is only received when this key code KC matches the key code stored in the decoder. be able to.

Therefore, the format shown in FIG. 9 is adopted for the addressing data AD.

The formant addressing data AD of the GB addressing data AD is also composed of 62 fields as one block, and is subjected to a yafling process to conceal the information.

The format shown in FIG. 9 is for one horizontal line before shuffling.

Addressing data AD is configured as follows.

■Key code KC (1 byte) Two types of key codes are sent. The key code consists of 4 bits, one is the key code for the current month, and the remaining one is the key code for the next month.

When the decoder receives the service data SDA, it enters the service state if either of the two key codes is stored in the memory.

■, Address data 7'1lDI, AD2 (3 each
Byte) This is address data for specifying the decoder, and although it differs depending on the mode code during addressing, which will be described later, the address and data AD.

With data from AD2 to AD2, decoder addresses can be specified in units of 100 units.

However, this address data cannot specify the addresses of individual decoders.

(2) Addresses are specified for 104 decoders based on the address of address map data AM (13 Hyde) address data AD, (AD2).

The first bit of the address map is address data AD
The address of each decoder is specified in sequence so that the address is for the same decoder as I (AD2), and the next 1 bit is the address for the next decoder.

Address data AD, , AD2 and address map data AM have different addressing specifications depending on the mode code MD described below.

(2) Mode code MD (2 bits) This is a code for specifying the mode during addressing.

Since it has a 2-bit configuration, you can select from the following four different atranging modes.

+a+, Mode O This is a batch addressing mode in which data service is not provided to all decoders having addresses specified by address data AD, AD2.

In this case, the bits of the adrenope data AM are all set to 10'', and the transmitted key code KC is not stored in the memory of the decoder.

(bl, mode 1 A mode in which data service is provided to the decoder specified by the address of address data AD, and the decoder specified by the address of address data AD2 (therefore, only two decoders are specified) It is.

(C), Mode 2 For each of the 104 decoders with address data AD+ and ADy as the base point of the address, following this address data A Dll and A D2 <address map AM
Addressing is executed by "1" and "0" of

In this case, address data ADI and AD2 are the same address data.

When address data AD specifies a decoder in the 100s, the first bit of address map AM is 100.
The bit following this specifies the 101st decoder.

When that bit is "1", the above-mentioned key codes (two types) are stored in the memory of the corresponding decoder.

On the other hand, when the bit is "0", no key code is stored.

(d), Mode 3, which is the opposite of mode O, addresses all decoders specified by address data AD, . . . AD2 at once.

Therefore, key codes will be stored in those decoders. In this case, address map data AM is set to all "1"s.

(2) Service Level Code)'SL (6 bits, G) This is a code that indicates which host computer's data was inserted and transmitted. The upper 3 bits are assigned to the data channel, and the lower 3 bits are assigned to the service level.

In the above example, eight host computers and eight horizontal lines (eight channels) are used for transmission, so a total of 64 types of service levels can be specified.

The reason for using the GB 2nd type Hi key code is to send out two types of key codes KC at the time of opening in J-shi's Adrenonon Gformanoto for the following reasons.

Addressing is performed before the reception contract period ends. For example, if the contract period is determined on a monthly basis, next month's addressing will be executed in the current month. The key code (in the transmission signal) sent during that contract period uses a key code with a different pattern from the previous key code, so if you send only the next month's key code (NrfW+) at the time of adreno song, the following will occur. For example, as shown in Figure 10, if the current month is January,
It is assumed that KC, is used as the key code KC for January, and KC2 is used as the key code KC for February.

In this case, addressing using the key code Kc2 is executed during period T in the latter half of January. Then, if a specific decoder has been paid the reception contract fee in both January and February, that specific decoder will record the key code KC2 in the predetermined memory 1a during adreno song in mode 2. .

Due to this memory operation, this memory contains the key code KC for January instead of KC? will be stored in memory.

Therefore, from the second half of January, the key code will be changed to KC, so during the second half of the period after addressing, you may not be able to receive data service even though the reception contract fee has been paid. This will cause inconvenience.

On the other hand, if the key codes KC, KC2 for the current month and the next month are sent out at the same time and the addressing is executed at the same time, as described above, the key codes KC, KC2 are both stored in memory. Even after addressing, you can receive the data service for that month, and the above-mentioned inconvenience is solved.

CI3Reason for setting multiple 7Drefthing modes The reason why multiple atranging modes can be selected is based on the following reasons.

For example, if the receiving station 10A, which has all decoders for addresses in the 0 to 1000 range, has not yet paid the reception contract fee, the batch addressing method using mode O is preferable to the case where addressing is carried out intensively using mode 2. can significantly reduce the time required for addressing.

For the same reason, when the reception contract fee for a certain receiving station 10A is paid, if you execute addressing in mode 3, addressing will be done in bulk in this case as well, and the addressing time can be greatly reduced. It is.

However, when the reception contract fee is paid differently depending on the address, by selecting mode 2, addressing can be performed according to the contract status of each receiving station 10A.

In addition, when addressing a specific receiving station among the plurality of receiving stations 10A, it is necessary to perform addressing in mode 2, but if mode 1 can be selected as described above, it is possible to Since only those receiving stations are addressed immediately, the addressing time can be reduced compared to when mode 2 is selected.

For this reason, by selecting the addressing mode according to the reception contract status, even if there are a large number of subscribers, the addressing time for all subscribers can be shortened.

FIG. 11 shows an example of a receiver 30 installed in a receiving station IOA for receiving a transmission signal having the above format and receiving a specific data service.

The broadcast signal received by the system diagram antenna 29 of the C++ receiver 30 is supplied to a tuner 40 with an all-channel configuration, where it is converted into a television signal in a predetermined frequency band, and this is supplied to a ghost canceller 41 for ghost cancellation. Processing is performed to avoid data extraction malfunctions.

The output signal is extracted and separated into the data separation circuit 42 (co-fed and the two broadcast signals inserted).
The transmitted transmission signal is supplied to a decoder 50, where decoding processing of service data SDA, etc. is executed. After the service data SDA is converted into a code format that meets the standards of the personal computer 31, it is sent to the interface 43.
The data is supplied to the personal computer 31 via.

44 is a control system, which is a controller 45,
It is comprised of a keyboard 46 for giving commands. 4
7 is a power supply device.

Circuit Description of GH5 Decoder 50 7PJ12 is a system diagram showing an example of the above-mentioned decoder 50, in which the transmission signal separated by the data demultiplexing section 42 is subjected to byte sync BYS extraction in the hide sync section 51.

To detect the bite sync BYS, a gate signal is generated using the horizontal and vertical synchronizing signals HD, VD and the clock signal CK in the gate pulse generating section 52, and after gating the vicinity of the bite sync BYS section with this gate signal, Detected.

When the byte sync BYS is detected, the detection signal is input to the gate pulse generator 52, which is used to extract the channel address CA, control data section CD, service data section CD, atranging data AD, etc. based on the byte sync BYS. A gate signal is created.

The channel address data CA extracted by the channel address gate section 54 is sent to the error correction (hamming) section 5.
5, and the error is corrected.

The error-corrected 4-bit channel address data CA is compared with the 4-pin data of the channel address setting sent from the controller 45 in the channel address comparison section 56, and if they match, the gate pulse generation section 5
Sends a match signal to 2.

The gate pulse generator 52 uses this coincidence signal as a reference to gate the insertion timing of channel address data on the same line in the next field. Similarly, gate pulses are output to the data gate 57 and control data gate 58.

The control data section CD extracted by the control data gate 58 is sent to the sync code detection section 60 in order to detect the sync code SC included in the control data section CD, and the sync code SC of 64ffEl'ft is extracted. Ru.

Here, when the same sync code SC is detected over three fields, this is sent as a sync code SC to the judgment circuit unit 59 as a sync detection signal. A holding signal for holding the sync code SC is sent to the holding unit 70.

Further, a gate signal for detecting the sync code of the next control data section CD is sent to the sync code detection section 59.

This allows the sync code SC to be easily detected. The details will be described later.

When the sync code SC is detected, the judgment circuit unit 59 tells the timing generating unit 72 to write the control data CDA itself following the sync code SC to the RAM 73, and at the same time to perform deshuffling according to the type of the sync code SC. Sends a sync detection signal to start.

The deshuffling pattern generating section 75 receives a pattern code (6 bits) from the sync pattern holding section 70 and generates a deshuffling pattern that becomes a write address of the RAM 73. The start signal is output from the timing generator 72.

When the control data CDA is read from the RAM 73, it is deshuffled.

In this read, the read counter 74 operates in response to a counter start signal from the timing generating section 72, and at the same time, the address switching section 76 is switched to the read side, and the read signal is changed to RAM? 3.

8, the control data ODA that has been filled out is corrected by an error correction (hamming) unit 80, and further, by a holding signal generated by a timing generation unit 72, the data and block information SB are extracted by the data profile information extraction 1i81.
However, the deshuffling map information SM is extracted by the deshuffling information extraction section 82 and used as a key signal for reproducing the data part.

Service data SDA (
Alternatively, the atranging data ADA) is stored in a data buffer 85 and sent to a deshuffling circuit 86, which is controlled by a buffer control section 87.

The buffer control section 87 receives a reference signal indicating the position (field) of the sync code in the control data CDA from the determination circuit section 60 and the data block information section 81.
Receives data block shift information from , and sets service data 5DA (or ranging data ADA) at a 1-block rate.

Control is performed to store the data in the data buffer 85 and then send it out.

The deshuffling circuit 86 is the deshuffling information unit 8
2, the deshuffling pattern information SM is input, and the service data is deshuffled. After that, service data SDA (or atranging data A
DA) is error corrected by an error correction circuit 91.

Note that when a Y-relay transmission failure occurs, a data recurrent signal is sent from the Gate Hals generation unit 52 to the buffer control unit 87, and the data in one block stored until the data transmission failure occurs is sent. Data is cleared.

Similarly, this data crescent signal is also supplied to the control data processing system to clear the data.

Specifically, the above-mentioned data reset signal is supplied to each of the deshuffling pattern generation section 75, the data block information extraction section 81, and the deshuffling information extraction section 82.

On the other hand, RAMll0 for data store has a larger transmission capacity than the normal transmission line (9600 ports)! (9900 baud), and even if a transmission failure as described above occurs, the data can be sent to the subsequent interface 43 without interruption.This processing mode is This is what is called a catch-up mode.

GI6 Service data DA decoding process When the service mode is detected by the adrenonong mode detection unit lOO, the error-corrected service data part SD (
1st line of belly button dark part H of 1st pronk)
Service level code detection unit 10 to read the information of D.
1. The baud rate detection section 102, the sync/async detection section 103, the data end 1* output section 104, and the key code detection section 105 operate to detect each piece of information.

The detected service level code SL is compared with the service level code sent from the controller 45 in the service level comparison section 107, and if they match, a match signal is sent to the buffer control section 108 and the key code comparison section 109.

The detected key code is compared with a predetermined key code stored at the time of addressing in key code comparison section 109, and if they match, a match signal is sent to buffer control section 108.

The buffer control unit 108 performs control to buffer the data required in the RAM 110 based on the service level match signal, key code match signal, baud rate information, and data end information, and output it to the interface 43 at a constant rate.

A boat rate signal and a sync/async signal are also sent to the interface 43.

Decoding processing in G17 addressing mode In the addressing mode, each line of the data block serves as addressing information.

Therefore, for each line, mode signal MC, service level code SL, key code KC, address data AD
7. AD2, use the address data map AM.

Therefore, in addition to the mode code detection section 112, a service level code detection section 121, a key code KC detection section 122, an address data AD detection section 123, an address data AD2 detection section 124, and an address data map AM detection section. Sections 125 are established and closed.

Mode code M detected by mode code detection unit 112
C is sent to the address data ID comparison section 113. The address data ID comparison unit 113 compares the sent address data with the ID (address data) unique to each decoder stored in the nonvolatile memory 114. Before this comparison, the mode code is
, , AD2 is a code for processing according to the address data map AM format.

When a match with the output of the decoder ID holding unit 115 is detected, an ID matching signal is sent to the memory control unit 116, and the memory control unit 116 selects the key code (two types) at this time.
is stored in the nonvolatile memory 114. At this time, the address of the non-volatile memory 114 is 6 of the service level code.
This is video information (channel address 3 bits, service level 3 bits).

The address selector 120 selects the service level code SL sent in the addressing mode,
In the service mode, the channel address data CA sent from the controller 45 and the service level setting value are selected.

In the service mode, the key code stored in the set channel address and service level is read out from the non-volatile memory 114 and sent to the key code comparison unit 109.
sent to.

Thirteenth explanation of CIB sink pinching section 60 and judgment circuit section 59
The figure is a system diagram showing the relationship between the sync code detection section 60 and the judgment circuit section 59, and the sync code detection section 60 is composed of a sync comparison section 61 and a sync pattern comparison section 62.
Each data of the control data section CD gated by the control data gate section 58 is converted into parallel data of 8 pins by the shift register 65, and then supplied to the sync comparison section 61, and the pattern of the sync code SC is 64.
1 (Which pattern of the neck sink pattern matches is compared.

If the pattern matches any of the 64 types of patterns, the match signal from the sync comparison section 61 is supplied to the sync pattern comparison section 62. The sync code SC itself is also supplied to the sync pattern comparison unit 62, and a comparison is made to see if the same sync pattern and matching signal have been input three times in a row.

When the same sync pattern is supplied over three fields, the sync pattern comparison section 62 outputs a sync detection signal.

The sync detection signal is supplied to the determination circuit section 59.

The determination circuit section 59 is composed of a counter timer, and a vertical synchronization pulse VD is supplied as its clock. The sync detection signal is used as a start signal for the counter timer, and the sync detection signal starts the counting operation.

When the counter timer counts 48 vertical synchronizing pulses VD, an "H" gate signal is output. As a result, the final field of the 48-byte control data CDA is detected following the sync code SC.

For this reason, the 48-byte fixed-length control data CDA of the control data section CD is 'L', and the variable-length dummy code DC and the following 3-byte sync code SC are 'L'. A gate signal that becomes "H" is generated by this judgment circuit 59.

The gate signal is supplied as a masking signal to the sync pattern comparison section 62, and the pattern comparison operation is prohibited during the period when the gate signal is "L", and the pattern comparison operation is executed only during the period when the gate signal is "H".

Since the sync code SC and negative signal are supplied to the sync pattern comparison unit 62 at any timing during the period when the gate signal is "H", even if the dummy code DC has a variable length, this dummy code The sync code SC following DC can be detected.

When the sync code detection section 60 and the judgment circuit section 59 are configured in this way, the sync code SC inserted into the control data section CD can be reliably detected even if the control data section CD has a variable length configuration. be able to.

Although the control data CDA may include the same pattern as the sync code SC, the dummy code DC input during the pattern comparison operation does not include the same pattern as the sync code SC. Together with this configuration, the detection accuracy of the sync code SC can be improved.

Note that the holding signal supplied to the sync pattern holding section 70, the sync detection signal supplied to the timing generation section 72, and the reference signal supplied to the buffer control section 87 are all output at the same timing as the sync detection signal. Ru.

As explained in detail about invention H, in this invention, in a new information service system, when the station side manages the payment status of the reception contract fee, the current and next key codes are simultaneously sent when addressing the decoder. It is designed to perform addressing.

According to this configuration, even if addressing is performed before the next reception contract period, the key code for receiving the current data service will not be updated. can receive.

Therefore, it has a feature that it is possible to reliably avoid inconveniences such as not being able to receive data services during the period after addressing.

Further, since this addressing utilizes address binary bits assigned to a plurality of decoders, the data structure does not become redundant.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a schematic configuration of an information service system according to the present invention, FIG. 2 is a diagram showing a formant of a transmission signal, FIG. 3 is a diagram showing a formant of a service data section, and FIG. 4 is a diagram showing a formant of a transmission signal. FIG. 5 is a diagram showing the relationship between the service data section and the header data section HD. FIG. 5 is a diagram showing the relationship between the baud rate and the service block. FIG. 6 is a diagram showing an example of the format of the control data section. FIG. 7 is sink code S
FIG. 8 shows the relationship between c and control data CDA.
The figure shows an example of the formant of control data CDA, Fig. 9 shows an example of the formant of addressing data, Fig. 10 is an explanatory diagram for the sync code SC, and Fig. 11 shows an example of the receiver. A system diagram of the main parts showing the
FIG. 12 is a system diagram showing an example of a decoder, and FIG. 13 is a system diagram showing a specific example of a sync code detection section and a discrimination circuit section. 10 is an information service system, IOA is a database station, IOB is a ground relay station, IOC is a receiving station, 12A to 12
15 is a host computer, 13A to 13H are pilling computers, 5o is a decoder, 59 is a judgment circuit section, 6o is a sync code detection section, and 87 is a buffer control section.

Claims (1)

[Claims] The service data and key code sent from the database station are received by a decoder provided on the subscriber side, and the key code sent after decoding the data becomes the key code on the receiving side. In an information service system in which a specific information service sent from the above database station can be received only when a match is made, the subscriber who has contracted to receive the service must possess a specific key code to be used during the contracted period. The key code is stored only in the decoder that is to be used, and two types of key codes with different patterns to be used for the current and next contract period are sent out at the same time, so that these two types of key codes are stored in the memory. Information service system with addressing.